LCOV - code coverage report
Current view: top level - fs/ext4 - ext4.h (source / functions) Hit Total Coverage
Test: Real Lines: 137 173 79.2 %
Date: 2020-10-17 15:46:16 Functions: 0 16 0.0 %
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0
       2                 :            : /*
       3                 :            :  *  ext4.h
       4                 :            :  *
       5                 :            :  * Copyright (C) 1992, 1993, 1994, 1995
       6                 :            :  * Remy Card (card@masi.ibp.fr)
       7                 :            :  * Laboratoire MASI - Institut Blaise Pascal
       8                 :            :  * Universite Pierre et Marie Curie (Paris VI)
       9                 :            :  *
      10                 :            :  *  from
      11                 :            :  *
      12                 :            :  *  linux/include/linux/minix_fs.h
      13                 :            :  *
      14                 :            :  *  Copyright (C) 1991, 1992  Linus Torvalds
      15                 :            :  */
      16                 :            : 
      17                 :            : #ifndef _EXT4_H
      18                 :            : #define _EXT4_H
      19                 :            : 
      20                 :            : #include <linux/types.h>
      21                 :            : #include <linux/blkdev.h>
      22                 :            : #include <linux/magic.h>
      23                 :            : #include <linux/jbd2.h>
      24                 :            : #include <linux/quota.h>
      25                 :            : #include <linux/rwsem.h>
      26                 :            : #include <linux/rbtree.h>
      27                 :            : #include <linux/seqlock.h>
      28                 :            : #include <linux/mutex.h>
      29                 :            : #include <linux/timer.h>
      30                 :            : #include <linux/version.h>
      31                 :            : #include <linux/wait.h>
      32                 :            : #include <linux/sched/signal.h>
      33                 :            : #include <linux/blockgroup_lock.h>
      34                 :            : #include <linux/percpu_counter.h>
      35                 :            : #include <linux/ratelimit.h>
      36                 :            : #include <crypto/hash.h>
      37                 :            : #include <linux/falloc.h>
      38                 :            : #include <linux/percpu-rwsem.h>
      39                 :            : #ifdef __KERNEL__
      40                 :            : #include <linux/compat.h>
      41                 :            : #endif
      42                 :            : 
      43                 :            : #include <linux/fscrypt.h>
      44                 :            : #include <linux/fsverity.h>
      45                 :            : 
      46                 :            : #include <linux/compiler.h>
      47                 :            : 
      48                 :            : /*
      49                 :            :  * The fourth extended filesystem constants/structures
      50                 :            :  */
      51                 :            : 
      52                 :            : /*
      53                 :            :  * with AGGRESSIVE_CHECK allocator runs consistency checks over
      54                 :            :  * structures. these checks slow things down a lot
      55                 :            :  */
      56                 :            : #define AGGRESSIVE_CHECK__
      57                 :            : 
      58                 :            : /*
      59                 :            :  * with DOUBLE_CHECK defined mballoc creates persistent in-core
      60                 :            :  * bitmaps, maintains and uses them to check for double allocations
      61                 :            :  */
      62                 :            : #define DOUBLE_CHECK__
      63                 :            : 
      64                 :            : /*
      65                 :            :  * Define EXT4FS_DEBUG to produce debug messages
      66                 :            :  */
      67                 :            : #undef EXT4FS_DEBUG
      68                 :            : 
      69                 :            : /*
      70                 :            :  * Debug code
      71                 :            :  */
      72                 :            : #ifdef EXT4FS_DEBUG
      73                 :            : #define ext4_debug(f, a...)                                             \
      74                 :            :         do {                                                            \
      75                 :            :                 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",      \
      76                 :            :                         __FILE__, __LINE__, __func__);                  \
      77                 :            :                 printk(KERN_DEBUG f, ## a);                             \
      78                 :            :         } while (0)
      79                 :            : #else
      80                 :            : #define ext4_debug(fmt, ...)    no_printk(fmt, ##__VA_ARGS__)
      81                 :            : #endif
      82                 :            : 
      83                 :            : /*
      84                 :            :  * Turn on EXT_DEBUG to get lots of info about extents operations.
      85                 :            :  */
      86                 :            : #define EXT_DEBUG__
      87                 :            : #ifdef EXT_DEBUG
      88                 :            : #define ext_debug(fmt, ...)     printk(fmt, ##__VA_ARGS__)
      89                 :            : #else
      90                 :            : #define ext_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
      91                 :            : #endif
      92                 :            : 
      93                 :            : /* data type for block offset of block group */
      94                 :            : typedef int ext4_grpblk_t;
      95                 :            : 
      96                 :            : /* data type for filesystem-wide blocks number */
      97                 :            : typedef unsigned long long ext4_fsblk_t;
      98                 :            : 
      99                 :            : /* data type for file logical block number */
     100                 :            : typedef __u32 ext4_lblk_t;
     101                 :            : 
     102                 :            : /* data type for block group number */
     103                 :            : typedef unsigned int ext4_group_t;
     104                 :            : 
     105                 :            : enum SHIFT_DIRECTION {
     106                 :            :         SHIFT_LEFT = 0,
     107                 :            :         SHIFT_RIGHT,
     108                 :            : };
     109                 :            : 
     110                 :            : /*
     111                 :            :  * Flags used in mballoc's allocation_context flags field.
     112                 :            :  *
     113                 :            :  * Also used to show what's going on for debugging purposes when the
     114                 :            :  * flag field is exported via the traceport interface
     115                 :            :  */
     116                 :            : 
     117                 :            : /* prefer goal again. length */
     118                 :            : #define EXT4_MB_HINT_MERGE              0x0001
     119                 :            : /* blocks already reserved */
     120                 :            : #define EXT4_MB_HINT_RESERVED           0x0002
     121                 :            : /* metadata is being allocated */
     122                 :            : #define EXT4_MB_HINT_METADATA           0x0004
     123                 :            : /* first blocks in the file */
     124                 :            : #define EXT4_MB_HINT_FIRST              0x0008
     125                 :            : /* search for the best chunk */
     126                 :            : #define EXT4_MB_HINT_BEST               0x0010
     127                 :            : /* data is being allocated */
     128                 :            : #define EXT4_MB_HINT_DATA               0x0020
     129                 :            : /* don't preallocate (for tails) */
     130                 :            : #define EXT4_MB_HINT_NOPREALLOC         0x0040
     131                 :            : /* allocate for locality group */
     132                 :            : #define EXT4_MB_HINT_GROUP_ALLOC        0x0080
     133                 :            : /* allocate goal blocks or none */
     134                 :            : #define EXT4_MB_HINT_GOAL_ONLY          0x0100
     135                 :            : /* goal is meaningful */
     136                 :            : #define EXT4_MB_HINT_TRY_GOAL           0x0200
     137                 :            : /* blocks already pre-reserved by delayed allocation */
     138                 :            : #define EXT4_MB_DELALLOC_RESERVED       0x0400
     139                 :            : /* We are doing stream allocation */
     140                 :            : #define EXT4_MB_STREAM_ALLOC            0x0800
     141                 :            : /* Use reserved root blocks if needed */
     142                 :            : #define EXT4_MB_USE_ROOT_BLOCKS         0x1000
     143                 :            : /* Use blocks from reserved pool */
     144                 :            : #define EXT4_MB_USE_RESERVED            0x2000
     145                 :            : 
     146                 :            : struct ext4_allocation_request {
     147                 :            :         /* target inode for block we're allocating */
     148                 :            :         struct inode *inode;
     149                 :            :         /* how many blocks we want to allocate */
     150                 :            :         unsigned int len;
     151                 :            :         /* logical block in target inode */
     152                 :            :         ext4_lblk_t logical;
     153                 :            :         /* the closest logical allocated block to the left */
     154                 :            :         ext4_lblk_t lleft;
     155                 :            :         /* the closest logical allocated block to the right */
     156                 :            :         ext4_lblk_t lright;
     157                 :            :         /* phys. target (a hint) */
     158                 :            :         ext4_fsblk_t goal;
     159                 :            :         /* phys. block for the closest logical allocated block to the left */
     160                 :            :         ext4_fsblk_t pleft;
     161                 :            :         /* phys. block for the closest logical allocated block to the right */
     162                 :            :         ext4_fsblk_t pright;
     163                 :            :         /* flags. see above EXT4_MB_HINT_* */
     164                 :            :         unsigned int flags;
     165                 :            : };
     166                 :            : 
     167                 :            : /*
     168                 :            :  * Logical to physical block mapping, used by ext4_map_blocks()
     169                 :            :  *
     170                 :            :  * This structure is used to pass requests into ext4_map_blocks() as
     171                 :            :  * well as to store the information returned by ext4_map_blocks().  It
     172                 :            :  * takes less room on the stack than a struct buffer_head.
     173                 :            :  */
     174                 :            : #define EXT4_MAP_NEW            (1 << BH_New)
     175                 :            : #define EXT4_MAP_MAPPED         (1 << BH_Mapped)
     176                 :            : #define EXT4_MAP_UNWRITTEN      (1 << BH_Unwritten)
     177                 :            : #define EXT4_MAP_BOUNDARY       (1 << BH_Boundary)
     178                 :            : #define EXT4_MAP_FLAGS          (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
     179                 :            :                                  EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
     180                 :            : 
     181                 :            : struct ext4_map_blocks {
     182                 :            :         ext4_fsblk_t m_pblk;
     183                 :            :         ext4_lblk_t m_lblk;
     184                 :            :         unsigned int m_len;
     185                 :            :         unsigned int m_flags;
     186                 :            : };
     187                 :            : 
     188                 :            : /*
     189                 :            :  * Block validity checking, system zone rbtree.
     190                 :            :  */
     191                 :            : struct ext4_system_blocks {
     192                 :            :         struct rb_root root;
     193                 :            :         struct rcu_head rcu;
     194                 :            : };
     195                 :            : 
     196                 :            : /*
     197                 :            :  * Flags for ext4_io_end->flags
     198                 :            :  */
     199                 :            : #define EXT4_IO_END_UNWRITTEN   0x0001
     200                 :            : 
     201                 :            : /*
     202                 :            :  * For converting unwritten extents on a work queue. 'handle' is used for
     203                 :            :  * buffered writeback.
     204                 :            :  */
     205                 :            : typedef struct ext4_io_end {
     206                 :            :         struct list_head        list;           /* per-file finished IO list */
     207                 :            :         handle_t                *handle;        /* handle reserved for extent
     208                 :            :                                                  * conversion */
     209                 :            :         struct inode            *inode;         /* file being written to */
     210                 :            :         struct bio              *bio;           /* Linked list of completed
     211                 :            :                                                  * bios covering the extent */
     212                 :            :         unsigned int            flag;           /* unwritten or not */
     213                 :            :         atomic_t                count;          /* reference counter */
     214                 :            :         loff_t                  offset;         /* offset in the file */
     215                 :            :         ssize_t                 size;           /* size of the extent */
     216                 :            : } ext4_io_end_t;
     217                 :            : 
     218                 :            : struct ext4_io_submit {
     219                 :            :         struct writeback_control *io_wbc;
     220                 :            :         struct bio              *io_bio;
     221                 :            :         ext4_io_end_t           *io_end;
     222                 :            :         sector_t                io_next_block;
     223                 :            : };
     224                 :            : 
     225                 :            : /*
     226                 :            :  * Special inodes numbers
     227                 :            :  */
     228                 :            : #define EXT4_BAD_INO             1      /* Bad blocks inode */
     229                 :            : #define EXT4_ROOT_INO            2      /* Root inode */
     230                 :            : #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
     231                 :            : #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
     232                 :            : #define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */
     233                 :            : #define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */
     234                 :            : #define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */
     235                 :            : #define EXT4_JOURNAL_INO         8      /* Journal inode */
     236                 :            : 
     237                 :            : /* First non-reserved inode for old ext4 filesystems */
     238                 :            : #define EXT4_GOOD_OLD_FIRST_INO 11
     239                 :            : 
     240                 :            : /*
     241                 :            :  * Maximal count of links to a file
     242                 :            :  */
     243                 :            : #define EXT4_LINK_MAX           65000
     244                 :            : 
     245                 :            : /*
     246                 :            :  * Macro-instructions used to manage several block sizes
     247                 :            :  */
     248                 :            : #define EXT4_MIN_BLOCK_SIZE             1024
     249                 :            : #define EXT4_MAX_BLOCK_SIZE             65536
     250                 :            : #define EXT4_MIN_BLOCK_LOG_SIZE         10
     251                 :            : #define EXT4_MAX_BLOCK_LOG_SIZE         16
     252                 :            : #define EXT4_MAX_CLUSTER_LOG_SIZE       30
     253                 :            : #ifdef __KERNEL__
     254                 :            : # define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)
     255                 :            : #else
     256                 :            : # define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
     257                 :            : #endif
     258                 :            : #define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
     259                 :            : #define EXT4_CLUSTER_SIZE(s)            (EXT4_BLOCK_SIZE(s) << \
     260                 :            :                                          EXT4_SB(s)->s_cluster_bits)
     261                 :            : #ifdef __KERNEL__
     262                 :            : # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
     263                 :            : # define EXT4_CLUSTER_BITS(s)           (EXT4_SB(s)->s_cluster_bits)
     264                 :            : #else
     265                 :            : # define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
     266                 :            : #endif
     267                 :            : #ifdef __KERNEL__
     268                 :            : #define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)
     269                 :            : #define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)
     270                 :            : #define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)
     271                 :            : #else
     272                 :            : #define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
     273                 :            :                                  EXT4_GOOD_OLD_INODE_SIZE : \
     274                 :            :                                  (s)->s_inode_size)
     275                 :            : #define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
     276                 :            :                                  EXT4_GOOD_OLD_FIRST_INO : \
     277                 :            :                                  (s)->s_first_ino)
     278                 :            : #endif
     279                 :            : #define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))
     280                 :            : #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
     281                 :            :         ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
     282                 :            :                                                                   blkbits))
     283                 :            : 
     284                 :            : /* Translate a block number to a cluster number */
     285                 :            : #define EXT4_B2C(sbi, blk)      ((blk) >> (sbi)->s_cluster_bits)
     286                 :            : /* Translate a cluster number to a block number */
     287                 :            : #define EXT4_C2B(sbi, cluster)  ((cluster) << (sbi)->s_cluster_bits)
     288                 :            : /* Translate # of blks to # of clusters */
     289                 :            : #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
     290                 :            :                                  (sbi)->s_cluster_bits)
     291                 :            : /* Mask out the low bits to get the starting block of the cluster */
     292                 :            : #define EXT4_PBLK_CMASK(s, pblk) ((pblk) &                          \
     293                 :            :                                   ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
     294                 :            : #define EXT4_LBLK_CMASK(s, lblk) ((lblk) &                          \
     295                 :            :                                   ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
     296                 :            : /* Fill in the low bits to get the last block of the cluster */
     297                 :            : #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) |                            \
     298                 :            :                                     ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
     299                 :            : /* Get the cluster offset */
     300                 :            : #define EXT4_PBLK_COFF(s, pblk) ((pblk) &                           \
     301                 :            :                                  ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
     302                 :            : #define EXT4_LBLK_COFF(s, lblk) ((lblk) &                           \
     303                 :            :                                  ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
     304                 :            : 
     305                 :            : /*
     306                 :            :  * Structure of a blocks group descriptor
     307                 :            :  */
     308                 :            : struct ext4_group_desc
     309                 :            : {
     310                 :            :         __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */
     311                 :            :         __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */
     312                 :            :         __le32  bg_inode_table_lo;      /* Inodes table block */
     313                 :            :         __le16  bg_free_blocks_count_lo;/* Free blocks count */
     314                 :            :         __le16  bg_free_inodes_count_lo;/* Free inodes count */
     315                 :            :         __le16  bg_used_dirs_count_lo;  /* Directories count */
     316                 :            :         __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
     317                 :            :         __le32  bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
     318                 :            :         __le16  bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
     319                 :            :         __le16  bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
     320                 :            :         __le16  bg_itable_unused_lo;    /* Unused inodes count */
     321                 :            :         __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */
     322                 :            :         __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
     323                 :            :         __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
     324                 :            :         __le32  bg_inode_table_hi;      /* Inodes table block MSB */
     325                 :            :         __le16  bg_free_blocks_count_hi;/* Free blocks count MSB */
     326                 :            :         __le16  bg_free_inodes_count_hi;/* Free inodes count MSB */
     327                 :            :         __le16  bg_used_dirs_count_hi;  /* Directories count MSB */
     328                 :            :         __le16  bg_itable_unused_hi;    /* Unused inodes count MSB */
     329                 :            :         __le32  bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
     330                 :            :         __le16  bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
     331                 :            :         __le16  bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
     332                 :            :         __u32   bg_reserved;
     333                 :            : };
     334                 :            : 
     335                 :            : #define EXT4_BG_INODE_BITMAP_CSUM_HI_END        \
     336                 :            :         (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
     337                 :            :          sizeof(__le16))
     338                 :            : #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END        \
     339                 :            :         (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
     340                 :            :          sizeof(__le16))
     341                 :            : 
     342                 :            : /*
     343                 :            :  * Structure of a flex block group info
     344                 :            :  */
     345                 :            : 
     346                 :            : struct flex_groups {
     347                 :            :         atomic64_t      free_clusters;
     348                 :            :         atomic_t        free_inodes;
     349                 :            :         atomic_t        used_dirs;
     350                 :            : };
     351                 :            : 
     352                 :            : #define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */
     353                 :            : #define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */
     354                 :            : #define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
     355                 :            : 
     356                 :            : /*
     357                 :            :  * Macro-instructions used to manage group descriptors
     358                 :            :  */
     359                 :            : #define EXT4_MIN_DESC_SIZE              32
     360                 :            : #define EXT4_MIN_DESC_SIZE_64BIT        64
     361                 :            : #define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE
     362                 :            : #define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)
     363                 :            : #ifdef __KERNEL__
     364                 :            : # define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)
     365                 :            : # define EXT4_CLUSTERS_PER_GROUP(s)     (EXT4_SB(s)->s_clusters_per_group)
     366                 :            : # define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)
     367                 :            : # define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)
     368                 :            : # define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)
     369                 :            : #else
     370                 :            : # define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
     371                 :            : # define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
     372                 :            : # define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
     373                 :            : #endif
     374                 :            : 
     375                 :            : /*
     376                 :            :  * Constants relative to the data blocks
     377                 :            :  */
     378                 :            : #define EXT4_NDIR_BLOCKS                12
     379                 :            : #define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS
     380                 :            : #define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)
     381                 :            : #define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)
     382                 :            : #define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)
     383                 :            : 
     384                 :            : /*
     385                 :            :  * Inode flags
     386                 :            :  */
     387                 :            : #define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */
     388                 :            : #define EXT4_UNRM_FL                    0x00000002 /* Undelete */
     389                 :            : #define EXT4_COMPR_FL                   0x00000004 /* Compress file */
     390                 :            : #define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */
     391                 :            : #define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */
     392                 :            : #define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */
     393                 :            : #define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */
     394                 :            : #define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */
     395                 :            : /* Reserved for compression usage... */
     396                 :            : #define EXT4_DIRTY_FL                   0x00000100
     397                 :            : #define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
     398                 :            : #define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */
     399                 :            :         /* nb: was previously EXT2_ECOMPR_FL */
     400                 :            : #define EXT4_ENCRYPT_FL                 0x00000800 /* encrypted file */
     401                 :            : /* End compression flags --- maybe not all used */
     402                 :            : #define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */
     403                 :            : #define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */
     404                 :            : #define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
     405                 :            : #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
     406                 :            : #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
     407                 :            : #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
     408                 :            : #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
     409                 :            : #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
     410                 :            : #define EXT4_VERITY_FL                  0x00100000 /* Verity protected inode */
     411                 :            : #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
     412                 :            : #define EXT4_EOFBLOCKS_FL               0x00400000 /* Blocks allocated beyond EOF */
     413                 :            : #define EXT4_INLINE_DATA_FL             0x10000000 /* Inode has inline data. */
     414                 :            : #define EXT4_PROJINHERIT_FL             0x20000000 /* Create with parents projid */
     415                 :            : #define EXT4_CASEFOLD_FL                0x40000000 /* Casefolded file */
     416                 :            : #define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
     417                 :            : 
     418                 :            : #define EXT4_FL_USER_VISIBLE            0x705BDFFF /* User visible flags */
     419                 :            : #define EXT4_FL_USER_MODIFIABLE         0x604BC0FF /* User modifiable flags */
     420                 :            : 
     421                 :            : /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
     422                 :            : #define EXT4_FL_XFLAG_VISIBLE           (EXT4_SYNC_FL | \
     423                 :            :                                          EXT4_IMMUTABLE_FL | \
     424                 :            :                                          EXT4_APPEND_FL | \
     425                 :            :                                          EXT4_NODUMP_FL | \
     426                 :            :                                          EXT4_NOATIME_FL | \
     427                 :            :                                          EXT4_PROJINHERIT_FL)
     428                 :            : 
     429                 :            : /* Flags that should be inherited by new inodes from their parent. */
     430                 :            : #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
     431                 :            :                            EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
     432                 :            :                            EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
     433                 :            :                            EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
     434                 :            :                            EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
     435                 :            : 
     436                 :            : /* Flags that are appropriate for regular files (all but dir-specific ones). */
     437                 :            : #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
     438                 :            :                            EXT4_PROJINHERIT_FL))
     439                 :            : 
     440                 :            : /* Flags that are appropriate for non-directories/regular files. */
     441                 :            : #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
     442                 :            : 
     443                 :            : /* The only flags that should be swapped */
     444                 :            : #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
     445                 :            : 
     446                 :            : /* Mask out flags that are inappropriate for the given type of inode. */
     447                 :            : static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
     448                 :            : {
     449                 :          3 :         if (S_ISDIR(mode))
     450                 :            :                 return flags;
     451                 :          3 :         else if (S_ISREG(mode))
     452                 :          3 :                 return flags & EXT4_REG_FLMASK;
     453                 :            :         else
     454                 :          3 :                 return flags & EXT4_OTHER_FLMASK;
     455                 :            : }
     456                 :            : 
     457                 :            : /*
     458                 :            :  * Inode flags used for atomic set/get
     459                 :            :  */
     460                 :            : enum {
     461                 :            :         EXT4_INODE_SECRM        = 0,    /* Secure deletion */
     462                 :            :         EXT4_INODE_UNRM         = 1,    /* Undelete */
     463                 :            :         EXT4_INODE_COMPR        = 2,    /* Compress file */
     464                 :            :         EXT4_INODE_SYNC         = 3,    /* Synchronous updates */
     465                 :            :         EXT4_INODE_IMMUTABLE    = 4,    /* Immutable file */
     466                 :            :         EXT4_INODE_APPEND       = 5,    /* writes to file may only append */
     467                 :            :         EXT4_INODE_NODUMP       = 6,    /* do not dump file */
     468                 :            :         EXT4_INODE_NOATIME      = 7,    /* do not update atime */
     469                 :            : /* Reserved for compression usage... */
     470                 :            :         EXT4_INODE_DIRTY        = 8,
     471                 :            :         EXT4_INODE_COMPRBLK     = 9,    /* One or more compressed clusters */
     472                 :            :         EXT4_INODE_NOCOMPR      = 10,   /* Don't compress */
     473                 :            :         EXT4_INODE_ENCRYPT      = 11,   /* Encrypted file */
     474                 :            : /* End compression flags --- maybe not all used */
     475                 :            :         EXT4_INODE_INDEX        = 12,   /* hash-indexed directory */
     476                 :            :         EXT4_INODE_IMAGIC       = 13,   /* AFS directory */
     477                 :            :         EXT4_INODE_JOURNAL_DATA = 14,   /* file data should be journaled */
     478                 :            :         EXT4_INODE_NOTAIL       = 15,   /* file tail should not be merged */
     479                 :            :         EXT4_INODE_DIRSYNC      = 16,   /* dirsync behaviour (directories only) */
     480                 :            :         EXT4_INODE_TOPDIR       = 17,   /* Top of directory hierarchies*/
     481                 :            :         EXT4_INODE_HUGE_FILE    = 18,   /* Set to each huge file */
     482                 :            :         EXT4_INODE_EXTENTS      = 19,   /* Inode uses extents */
     483                 :            :         EXT4_INODE_VERITY       = 20,   /* Verity protected inode */
     484                 :            :         EXT4_INODE_EA_INODE     = 21,   /* Inode used for large EA */
     485                 :            :         EXT4_INODE_EOFBLOCKS    = 22,   /* Blocks allocated beyond EOF */
     486                 :            :         EXT4_INODE_INLINE_DATA  = 28,   /* Data in inode. */
     487                 :            :         EXT4_INODE_PROJINHERIT  = 29,   /* Create with parents projid */
     488                 :            :         EXT4_INODE_RESERVED     = 31,   /* reserved for ext4 lib */
     489                 :            : };
     490                 :            : 
     491                 :            : /*
     492                 :            :  * Since it's pretty easy to mix up bit numbers and hex values, we use a
     493                 :            :  * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
     494                 :            :  * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
     495                 :            :  * any extra space in the compiled kernel image, otherwise, the build will fail.
     496                 :            :  * It's important that these values are the same, since we are using
     497                 :            :  * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
     498                 :            :  * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
     499                 :            :  * values found in ext2, ext3 and ext4 filesystems, and of course the values
     500                 :            :  * defined in e2fsprogs.
     501                 :            :  *
     502                 :            :  * It's not paranoia if the Murphy's Law really *is* out to get you.  :-)
     503                 :            :  */
     504                 :            : #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
     505                 :            : #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
     506                 :            : 
     507                 :            : static inline void ext4_check_flag_values(void)
     508                 :            : {
     509                 :            :         CHECK_FLAG_VALUE(SECRM);
     510                 :            :         CHECK_FLAG_VALUE(UNRM);
     511                 :            :         CHECK_FLAG_VALUE(COMPR);
     512                 :            :         CHECK_FLAG_VALUE(SYNC);
     513                 :            :         CHECK_FLAG_VALUE(IMMUTABLE);
     514                 :            :         CHECK_FLAG_VALUE(APPEND);
     515                 :            :         CHECK_FLAG_VALUE(NODUMP);
     516                 :            :         CHECK_FLAG_VALUE(NOATIME);
     517                 :            :         CHECK_FLAG_VALUE(DIRTY);
     518                 :            :         CHECK_FLAG_VALUE(COMPRBLK);
     519                 :            :         CHECK_FLAG_VALUE(NOCOMPR);
     520                 :            :         CHECK_FLAG_VALUE(ENCRYPT);
     521                 :            :         CHECK_FLAG_VALUE(INDEX);
     522                 :            :         CHECK_FLAG_VALUE(IMAGIC);
     523                 :            :         CHECK_FLAG_VALUE(JOURNAL_DATA);
     524                 :            :         CHECK_FLAG_VALUE(NOTAIL);
     525                 :            :         CHECK_FLAG_VALUE(DIRSYNC);
     526                 :            :         CHECK_FLAG_VALUE(TOPDIR);
     527                 :            :         CHECK_FLAG_VALUE(HUGE_FILE);
     528                 :            :         CHECK_FLAG_VALUE(EXTENTS);
     529                 :            :         CHECK_FLAG_VALUE(VERITY);
     530                 :            :         CHECK_FLAG_VALUE(EA_INODE);
     531                 :            :         CHECK_FLAG_VALUE(EOFBLOCKS);
     532                 :            :         CHECK_FLAG_VALUE(INLINE_DATA);
     533                 :            :         CHECK_FLAG_VALUE(PROJINHERIT);
     534                 :            :         CHECK_FLAG_VALUE(RESERVED);
     535                 :            : }
     536                 :            : 
     537                 :            : /* Used to pass group descriptor data when online resize is done */
     538                 :            : struct ext4_new_group_input {
     539                 :            :         __u32 group;            /* Group number for this data */
     540                 :            :         __u64 block_bitmap;     /* Absolute block number of block bitmap */
     541                 :            :         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
     542                 :            :         __u64 inode_table;      /* Absolute block number of inode table start */
     543                 :            :         __u32 blocks_count;     /* Total number of blocks in this group */
     544                 :            :         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
     545                 :            :         __u16 unused;
     546                 :            : };
     547                 :            : 
     548                 :            : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
     549                 :            : struct compat_ext4_new_group_input {
     550                 :            :         u32 group;
     551                 :            :         compat_u64 block_bitmap;
     552                 :            :         compat_u64 inode_bitmap;
     553                 :            :         compat_u64 inode_table;
     554                 :            :         u32 blocks_count;
     555                 :            :         u16 reserved_blocks;
     556                 :            :         u16 unused;
     557                 :            : };
     558                 :            : #endif
     559                 :            : 
     560                 :            : /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
     561                 :            : struct ext4_new_group_data {
     562                 :            :         __u32 group;
     563                 :            :         __u64 block_bitmap;
     564                 :            :         __u64 inode_bitmap;
     565                 :            :         __u64 inode_table;
     566                 :            :         __u32 blocks_count;
     567                 :            :         __u16 reserved_blocks;
     568                 :            :         __u16 mdata_blocks;
     569                 :            :         __u32 free_clusters_count;
     570                 :            : };
     571                 :            : 
     572                 :            : /* Indexes used to index group tables in ext4_new_group_data */
     573                 :            : enum {
     574                 :            :         BLOCK_BITMAP = 0,       /* block bitmap */
     575                 :            :         INODE_BITMAP,           /* inode bitmap */
     576                 :            :         INODE_TABLE,            /* inode tables */
     577                 :            :         GROUP_TABLE_COUNT,
     578                 :            : };
     579                 :            : 
     580                 :            : /*
     581                 :            :  * Flags used by ext4_map_blocks()
     582                 :            :  */
     583                 :            :         /* Allocate any needed blocks and/or convert an unwritten
     584                 :            :            extent to be an initialized ext4 */
     585                 :            : #define EXT4_GET_BLOCKS_CREATE                  0x0001
     586                 :            :         /* Request the creation of an unwritten extent */
     587                 :            : #define EXT4_GET_BLOCKS_UNWRIT_EXT              0x0002
     588                 :            : #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT       (EXT4_GET_BLOCKS_UNWRIT_EXT|\
     589                 :            :                                                  EXT4_GET_BLOCKS_CREATE)
     590                 :            :         /* Caller is from the delayed allocation writeout path
     591                 :            :          * finally doing the actual allocation of delayed blocks */
     592                 :            : #define EXT4_GET_BLOCKS_DELALLOC_RESERVE        0x0004
     593                 :            :         /* caller is from the direct IO path, request to creation of an
     594                 :            :         unwritten extents if not allocated, split the unwritten
     595                 :            :         extent if blocks has been preallocated already*/
     596                 :            : #define EXT4_GET_BLOCKS_PRE_IO                  0x0008
     597                 :            : #define EXT4_GET_BLOCKS_CONVERT                 0x0010
     598                 :            : #define EXT4_GET_BLOCKS_IO_CREATE_EXT           (EXT4_GET_BLOCKS_PRE_IO|\
     599                 :            :                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
     600                 :            :         /* Convert extent to initialized after IO complete */
     601                 :            : #define EXT4_GET_BLOCKS_IO_CONVERT_EXT          (EXT4_GET_BLOCKS_CONVERT|\
     602                 :            :                                          EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
     603                 :            :         /* Eventual metadata allocation (due to growing extent tree)
     604                 :            :          * should not fail, so try to use reserved blocks for that.*/
     605                 :            : #define EXT4_GET_BLOCKS_METADATA_NOFAIL         0x0020
     606                 :            :         /* Don't normalize allocation size (used for fallocate) */
     607                 :            : #define EXT4_GET_BLOCKS_NO_NORMALIZE            0x0040
     608                 :            :         /* Request will not result in inode size update (user for fallocate) */
     609                 :            : #define EXT4_GET_BLOCKS_KEEP_SIZE               0x0080
     610                 :            :         /* Convert written extents to unwritten */
     611                 :            : #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN       0x0100
     612                 :            :         /* Write zeros to newly created written extents */
     613                 :            : #define EXT4_GET_BLOCKS_ZERO                    0x0200
     614                 :            : #define EXT4_GET_BLOCKS_CREATE_ZERO             (EXT4_GET_BLOCKS_CREATE |\
     615                 :            :                                         EXT4_GET_BLOCKS_ZERO)
     616                 :            :         /* Caller will submit data before dropping transaction handle. This
     617                 :            :          * allows jbd2 to avoid submitting data before commit. */
     618                 :            : #define EXT4_GET_BLOCKS_IO_SUBMIT               0x0400
     619                 :            : 
     620                 :            : /*
     621                 :            :  * The bit position of these flags must not overlap with any of the
     622                 :            :  * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
     623                 :            :  * read_extent_tree_block(), ext4_split_extent_at(),
     624                 :            :  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
     625                 :            :  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
     626                 :            :  * caching the extents when reading from the extent tree while a
     627                 :            :  * truncate or punch hole operation is in progress.
     628                 :            :  */
     629                 :            : #define EXT4_EX_NOCACHE                         0x40000000
     630                 :            : #define EXT4_EX_FORCE_CACHE                     0x20000000
     631                 :            : 
     632                 :            : /*
     633                 :            :  * Flags used by ext4_free_blocks
     634                 :            :  */
     635                 :            : #define EXT4_FREE_BLOCKS_METADATA               0x0001
     636                 :            : #define EXT4_FREE_BLOCKS_FORGET                 0x0002
     637                 :            : #define EXT4_FREE_BLOCKS_VALIDATED              0x0004
     638                 :            : #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE         0x0008
     639                 :            : #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER   0x0010
     640                 :            : #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER    0x0020
     641                 :            : #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER      0x0040
     642                 :            : 
     643                 :            : /*
     644                 :            :  * ioctl commands
     645                 :            :  */
     646                 :            : #define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS
     647                 :            : #define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS
     648                 :            : #define EXT4_IOC_GETVERSION             _IOR('f', 3, long)
     649                 :            : #define EXT4_IOC_SETVERSION             _IOW('f', 4, long)
     650                 :            : #define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION
     651                 :            : #define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION
     652                 :            : #define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)
     653                 :            : #define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)
     654                 :            : #define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
     655                 :            : #define EXT4_IOC_GROUP_ADD              _IOW('f', 8, struct ext4_new_group_input)
     656                 :            : #define EXT4_IOC_MIGRATE                _IO('f', 9)
     657                 :            :  /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
     658                 :            :  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
     659                 :            : #define EXT4_IOC_ALLOC_DA_BLKS          _IO('f', 12)
     660                 :            : #define EXT4_IOC_MOVE_EXT               _IOWR('f', 15, struct move_extent)
     661                 :            : #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
     662                 :            : #define EXT4_IOC_SWAP_BOOT              _IO('f', 17)
     663                 :            : #define EXT4_IOC_PRECACHE_EXTENTS       _IO('f', 18)
     664                 :            : #define EXT4_IOC_SET_ENCRYPTION_POLICY  FS_IOC_SET_ENCRYPTION_POLICY
     665                 :            : #define EXT4_IOC_GET_ENCRYPTION_PWSALT  FS_IOC_GET_ENCRYPTION_PWSALT
     666                 :            : #define EXT4_IOC_GET_ENCRYPTION_POLICY  FS_IOC_GET_ENCRYPTION_POLICY
     667                 :            : /* ioctl codes 19--39 are reserved for fscrypt */
     668                 :            : #define EXT4_IOC_CLEAR_ES_CACHE         _IO('f', 40)
     669                 :            : #define EXT4_IOC_GETSTATE               _IOW('f', 41, __u32)
     670                 :            : #define EXT4_IOC_GET_ES_CACHE           _IOWR('f', 42, struct fiemap)
     671                 :            : 
     672                 :            : #define EXT4_IOC_FSGETXATTR             FS_IOC_FSGETXATTR
     673                 :            : #define EXT4_IOC_FSSETXATTR             FS_IOC_FSSETXATTR
     674                 :            : 
     675                 :            : #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
     676                 :            : 
     677                 :            : /*
     678                 :            :  * Flags for going down operation
     679                 :            :  */
     680                 :            : #define EXT4_GOING_FLAGS_DEFAULT                0x0     /* going down */
     681                 :            : #define EXT4_GOING_FLAGS_LOGFLUSH               0x1     /* flush log but not data */
     682                 :            : #define EXT4_GOING_FLAGS_NOLOGFLUSH             0x2     /* don't flush log nor data */
     683                 :            : 
     684                 :            : /*
     685                 :            :  * Flags returned by EXT4_IOC_GETSTATE
     686                 :            :  *
     687                 :            :  * We only expose to userspace a subset of the state flags in
     688                 :            :  * i_state_flags
     689                 :            :  */
     690                 :            : #define EXT4_STATE_FLAG_EXT_PRECACHED   0x00000001
     691                 :            : #define EXT4_STATE_FLAG_NEW             0x00000002
     692                 :            : #define EXT4_STATE_FLAG_NEWENTRY        0x00000004
     693                 :            : #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE  0x00000008
     694                 :            : 
     695                 :            : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
     696                 :            : /*
     697                 :            :  * ioctl commands in 32 bit emulation
     698                 :            :  */
     699                 :            : #define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
     700                 :            : #define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
     701                 :            : #define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)
     702                 :            : #define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)
     703                 :            : #define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)
     704                 :            : #define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)
     705                 :            : #define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)
     706                 :            : #define EXT4_IOC32_GROUP_ADD            _IOW('f', 8, struct compat_ext4_new_group_input)
     707                 :            : #define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION
     708                 :            : #define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION
     709                 :            : #endif
     710                 :            : 
     711                 :            : /*
     712                 :            :  * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
     713                 :            :  * It indicates that the entry in extent status cache is for a hole.
     714                 :            :  */
     715                 :            : #define EXT4_FIEMAP_EXTENT_HOLE         0x08000000
     716                 :            : 
     717                 :            : /* Max physical block we can address w/o extents */
     718                 :            : #define EXT4_MAX_BLOCK_FILE_PHYS        0xFFFFFFFF
     719                 :            : 
     720                 :            : /* Max logical block we can support */
     721                 :            : #define EXT4_MAX_LOGICAL_BLOCK          0xFFFFFFFF
     722                 :            : 
     723                 :            : /*
     724                 :            :  * Structure of an inode on the disk
     725                 :            :  */
     726                 :            : struct ext4_inode {
     727                 :            :         __le16  i_mode;         /* File mode */
     728                 :            :         __le16  i_uid;          /* Low 16 bits of Owner Uid */
     729                 :            :         __le32  i_size_lo;      /* Size in bytes */
     730                 :            :         __le32  i_atime;        /* Access time */
     731                 :            :         __le32  i_ctime;        /* Inode Change time */
     732                 :            :         __le32  i_mtime;        /* Modification time */
     733                 :            :         __le32  i_dtime;        /* Deletion Time */
     734                 :            :         __le16  i_gid;          /* Low 16 bits of Group Id */
     735                 :            :         __le16  i_links_count;  /* Links count */
     736                 :            :         __le32  i_blocks_lo;    /* Blocks count */
     737                 :            :         __le32  i_flags;        /* File flags */
     738                 :            :         union {
     739                 :            :                 struct {
     740                 :            :                         __le32  l_i_version;
     741                 :            :                 } linux1;
     742                 :            :                 struct {
     743                 :            :                         __u32  h_i_translator;
     744                 :            :                 } hurd1;
     745                 :            :                 struct {
     746                 :            :                         __u32  m_i_reserved1;
     747                 :            :                 } masix1;
     748                 :            :         } osd1;                         /* OS dependent 1 */
     749                 :            :         __le32  i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
     750                 :            :         __le32  i_generation;   /* File version (for NFS) */
     751                 :            :         __le32  i_file_acl_lo;  /* File ACL */
     752                 :            :         __le32  i_size_high;
     753                 :            :         __le32  i_obso_faddr;   /* Obsoleted fragment address */
     754                 :            :         union {
     755                 :            :                 struct {
     756                 :            :                         __le16  l_i_blocks_high; /* were l_i_reserved1 */
     757                 :            :                         __le16  l_i_file_acl_high;
     758                 :            :                         __le16  l_i_uid_high;   /* these 2 fields */
     759                 :            :                         __le16  l_i_gid_high;   /* were reserved2[0] */
     760                 :            :                         __le16  l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
     761                 :            :                         __le16  l_i_reserved;
     762                 :            :                 } linux2;
     763                 :            :                 struct {
     764                 :            :                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
     765                 :            :                         __u16   h_i_mode_high;
     766                 :            :                         __u16   h_i_uid_high;
     767                 :            :                         __u16   h_i_gid_high;
     768                 :            :                         __u32   h_i_author;
     769                 :            :                 } hurd2;
     770                 :            :                 struct {
     771                 :            :                         __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */
     772                 :            :                         __le16  m_i_file_acl_high;
     773                 :            :                         __u32   m_i_reserved2[2];
     774                 :            :                 } masix2;
     775                 :            :         } osd2;                         /* OS dependent 2 */
     776                 :            :         __le16  i_extra_isize;
     777                 :            :         __le16  i_checksum_hi;  /* crc32c(uuid+inum+inode) BE */
     778                 :            :         __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */
     779                 :            :         __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */
     780                 :            :         __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */
     781                 :            :         __le32  i_crtime;       /* File Creation time */
     782                 :            :         __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
     783                 :            :         __le32  i_version_hi;   /* high 32 bits for 64-bit version */
     784                 :            :         __le32  i_projid;       /* Project ID */
     785                 :            : };
     786                 :            : 
     787                 :            : struct move_extent {
     788                 :            :         __u32 reserved;         /* should be zero */
     789                 :            :         __u32 donor_fd;         /* donor file descriptor */
     790                 :            :         __u64 orig_start;       /* logical start offset in block for orig */
     791                 :            :         __u64 donor_start;      /* logical start offset in block for donor */
     792                 :            :         __u64 len;              /* block length to be moved */
     793                 :            :         __u64 moved_len;        /* moved block length */
     794                 :            : };
     795                 :            : 
     796                 :            : #define EXT4_EPOCH_BITS 2
     797                 :            : #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
     798                 :            : #define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)
     799                 :            : 
     800                 :            : /*
     801                 :            :  * Extended fields will fit into an inode if the filesystem was formatted
     802                 :            :  * with large inodes (-I 256 or larger) and there are not currently any EAs
     803                 :            :  * consuming all of the available space. For new inodes we always reserve
     804                 :            :  * enough space for the kernel's known extended fields, but for inodes
     805                 :            :  * created with an old kernel this might not have been the case. None of
     806                 :            :  * the extended inode fields is critical for correct filesystem operation.
     807                 :            :  * This macro checks if a certain field fits in the inode. Note that
     808                 :            :  * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
     809                 :            :  */
     810                 :            : #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \
     811                 :            :         ((offsetof(typeof(*ext4_inode), field) +        \
     812                 :            :           sizeof((ext4_inode)->field))                       \
     813                 :            :         <= (EXT4_GOOD_OLD_INODE_SIZE +                       \
     814                 :            :             (einode)->i_extra_isize))                        \
     815                 :            : 
     816                 :            : /*
     817                 :            :  * We use an encoding that preserves the times for extra epoch "00":
     818                 :            :  *
     819                 :            :  * extra  msb of                         adjust for signed
     820                 :            :  * epoch  32-bit                         32-bit tv_sec to
     821                 :            :  * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range
     822                 :            :  * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31
     823                 :            :  * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19
     824                 :            :  * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07
     825                 :            :  * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25
     826                 :            :  * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16
     827                 :            :  * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04
     828                 :            :  * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22
     829                 :            :  * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10
     830                 :            :  *
     831                 :            :  * Note that previous versions of the kernel on 64-bit systems would
     832                 :            :  * incorrectly use extra epoch bits 1,1 for dates between 1901 and
     833                 :            :  * 1970.  e2fsck will correct this, assuming that it is run on the
     834                 :            :  * affected filesystem before 2242.
     835                 :            :  */
     836                 :            : 
     837                 :            : static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
     838                 :            : {
     839                 :          3 :         u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
     840                 :          3 :         return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
     841                 :            : }
     842                 :            : 
     843                 :            : static inline void ext4_decode_extra_time(struct timespec64 *time,
     844                 :            :                                           __le32 extra)
     845                 :            : {
     846                 :          3 :         if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
     847                 :          0 :                 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
     848                 :          3 :         time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
     849                 :            : }
     850                 :            : 
     851                 :            : #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                           \
     852                 :            : do {                                                                            \
     853                 :            :         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     {\
     854                 :            :                 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);  \
     855                 :            :                 (raw_inode)->xtime ## _extra =                                       \
     856                 :            :                                 ext4_encode_extra_time(&(inode)->xtime); \
     857                 :            :                 }                                                               \
     858                 :            :         else    \
     859                 :            :                 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX));      \
     860                 :            : } while (0)
     861                 :            : 
     862                 :            : #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \
     863                 :            : do {                                                                           \
     864                 :            :         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
     865                 :            :                 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \
     866                 :            :         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
     867                 :            :                 (raw_inode)->xtime ## _extra =                                      \
     868                 :            :                                 ext4_encode_extra_time(&(einode)->xtime);      \
     869                 :            : } while (0)
     870                 :            : 
     871                 :            : #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                           \
     872                 :            : do {                                                                            \
     873                 :            :         (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);  \
     874                 :            :         if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {    \
     875                 :            :                 ext4_decode_extra_time(&(inode)->xtime,                          \
     876                 :            :                                        raw_inode->xtime ## _extra);          \
     877                 :            :                 }                                                               \
     878                 :            :         else                                                                    \
     879                 :            :                 (inode)->xtime.tv_nsec = 0;                                  \
     880                 :            : } while (0)
     881                 :            : 
     882                 :            : 
     883                 :            : #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \
     884                 :            : do {                                                                           \
     885                 :            :         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \
     886                 :            :                 (einode)->xtime.tv_sec =                                    \
     887                 :            :                         (signed)le32_to_cpu((raw_inode)->xtime);            \
     888                 :            :         else                                                                   \
     889                 :            :                 (einode)->xtime.tv_sec = 0;                                 \
     890                 :            :         if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \
     891                 :            :                 ext4_decode_extra_time(&(einode)->xtime,                \
     892                 :            :                                        raw_inode->xtime ## _extra);         \
     893                 :            :         else                                                                   \
     894                 :            :                 (einode)->xtime.tv_nsec = 0;                                \
     895                 :            : } while (0)
     896                 :            : 
     897                 :            : #define i_disk_version osd1.linux1.l_i_version
     898                 :            : 
     899                 :            : #if defined(__KERNEL__) || defined(__linux__)
     900                 :            : #define i_reserved1     osd1.linux1.l_i_reserved1
     901                 :            : #define i_file_acl_high osd2.linux2.l_i_file_acl_high
     902                 :            : #define i_blocks_high   osd2.linux2.l_i_blocks_high
     903                 :            : #define i_uid_low       i_uid
     904                 :            : #define i_gid_low       i_gid
     905                 :            : #define i_uid_high      osd2.linux2.l_i_uid_high
     906                 :            : #define i_gid_high      osd2.linux2.l_i_gid_high
     907                 :            : #define i_checksum_lo   osd2.linux2.l_i_checksum_lo
     908                 :            : 
     909                 :            : #elif defined(__GNU__)
     910                 :            : 
     911                 :            : #define i_translator    osd1.hurd1.h_i_translator
     912                 :            : #define i_uid_high      osd2.hurd2.h_i_uid_high
     913                 :            : #define i_gid_high      osd2.hurd2.h_i_gid_high
     914                 :            : #define i_author        osd2.hurd2.h_i_author
     915                 :            : 
     916                 :            : #elif defined(__masix__)
     917                 :            : 
     918                 :            : #define i_reserved1     osd1.masix1.m_i_reserved1
     919                 :            : #define i_file_acl_high osd2.masix2.m_i_file_acl_high
     920                 :            : #define i_reserved2     osd2.masix2.m_i_reserved2
     921                 :            : 
     922                 :            : #endif /* defined(__KERNEL__) || defined(__linux__) */
     923                 :            : 
     924                 :            : #include "extents_status.h"
     925                 :            : 
     926                 :            : /*
     927                 :            :  * Lock subclasses for i_data_sem in the ext4_inode_info structure.
     928                 :            :  *
     929                 :            :  * These are needed to avoid lockdep false positives when we need to
     930                 :            :  * allocate blocks to the quota inode during ext4_map_blocks(), while
     931                 :            :  * holding i_data_sem for a normal (non-quota) inode.  Since we don't
     932                 :            :  * do quota tracking for the quota inode, this avoids deadlock (as
     933                 :            :  * well as infinite recursion, since it isn't turtles all the way
     934                 :            :  * down...)
     935                 :            :  *
     936                 :            :  *  I_DATA_SEM_NORMAL - Used for most inodes
     937                 :            :  *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
     938                 :            :  *                        where the second inode has larger inode number
     939                 :            :  *                        than the first
     940                 :            :  *  I_DATA_SEM_QUOTA  - Used for quota inodes only
     941                 :            :  */
     942                 :            : enum {
     943                 :            :         I_DATA_SEM_NORMAL = 0,
     944                 :            :         I_DATA_SEM_OTHER,
     945                 :            :         I_DATA_SEM_QUOTA,
     946                 :            : };
     947                 :            : 
     948                 :            : 
     949                 :            : /*
     950                 :            :  * fourth extended file system inode data in memory
     951                 :            :  */
     952                 :            : struct ext4_inode_info {
     953                 :            :         __le32  i_data[15];     /* unconverted */
     954                 :            :         __u32   i_dtime;
     955                 :            :         ext4_fsblk_t    i_file_acl;
     956                 :            : 
     957                 :            :         /*
     958                 :            :          * i_block_group is the number of the block group which contains
     959                 :            :          * this file's inode.  Constant across the lifetime of the inode,
     960                 :            :          * it is used for making block allocation decisions - we try to
     961                 :            :          * place a file's data blocks near its inode block, and new inodes
     962                 :            :          * near to their parent directory's inode.
     963                 :            :          */
     964                 :            :         ext4_group_t    i_block_group;
     965                 :            :         ext4_lblk_t     i_dir_start_lookup;
     966                 :            : #if (BITS_PER_LONG < 64)
     967                 :            :         unsigned long   i_state_flags;          /* Dynamic state flags */
     968                 :            : #endif
     969                 :            :         unsigned long   i_flags;
     970                 :            : 
     971                 :            :         /*
     972                 :            :          * Extended attributes can be read independently of the main file
     973                 :            :          * data. Taking i_mutex even when reading would cause contention
     974                 :            :          * between readers of EAs and writers of regular file data, so
     975                 :            :          * instead we synchronize on xattr_sem when reading or changing
     976                 :            :          * EAs.
     977                 :            :          */
     978                 :            :         struct rw_semaphore xattr_sem;
     979                 :            : 
     980                 :            :         struct list_head i_orphan;      /* unlinked but open inodes */
     981                 :            : 
     982                 :            :         /*
     983                 :            :          * i_disksize keeps track of what the inode size is ON DISK, not
     984                 :            :          * in memory.  During truncate, i_size is set to the new size by
     985                 :            :          * the VFS prior to calling ext4_truncate(), but the filesystem won't
     986                 :            :          * set i_disksize to 0 until the truncate is actually under way.
     987                 :            :          *
     988                 :            :          * The intent is that i_disksize always represents the blocks which
     989                 :            :          * are used by this file.  This allows recovery to restart truncate
     990                 :            :          * on orphans if we crash during truncate.  We actually write i_disksize
     991                 :            :          * into the on-disk inode when writing inodes out, instead of i_size.
     992                 :            :          *
     993                 :            :          * The only time when i_disksize and i_size may be different is when
     994                 :            :          * a truncate is in progress.  The only things which change i_disksize
     995                 :            :          * are ext4_get_block (growth) and ext4_truncate (shrinkth).
     996                 :            :          */
     997                 :            :         loff_t  i_disksize;
     998                 :            : 
     999                 :            :         /*
    1000                 :            :          * i_data_sem is for serialising ext4_truncate() against
    1001                 :            :          * ext4_getblock().  In the 2.4 ext2 design, great chunks of inode's
    1002                 :            :          * data tree are chopped off during truncate. We can't do that in
    1003                 :            :          * ext4 because whenever we perform intermediate commits during
    1004                 :            :          * truncate, the inode and all the metadata blocks *must* be in a
    1005                 :            :          * consistent state which allows truncation of the orphans to restart
    1006                 :            :          * during recovery.  Hence we must fix the get_block-vs-truncate race
    1007                 :            :          * by other means, so we have i_data_sem.
    1008                 :            :          */
    1009                 :            :         struct rw_semaphore i_data_sem;
    1010                 :            :         /*
    1011                 :            :          * i_mmap_sem is for serializing page faults with truncate / punch hole
    1012                 :            :          * operations. We have to make sure that new page cannot be faulted in
    1013                 :            :          * a section of the inode that is being punched. We cannot easily use
    1014                 :            :          * i_data_sem for this since we need protection for the whole punch
    1015                 :            :          * operation and i_data_sem ranks below transaction start so we have
    1016                 :            :          * to occasionally drop it.
    1017                 :            :          */
    1018                 :            :         struct rw_semaphore i_mmap_sem;
    1019                 :            :         struct inode vfs_inode;
    1020                 :            :         struct jbd2_inode *jinode;
    1021                 :            : 
    1022                 :            :         spinlock_t i_raw_lock;  /* protects updates to the raw inode */
    1023                 :            : 
    1024                 :            :         /*
    1025                 :            :          * File creation time. Its function is same as that of
    1026                 :            :          * struct timespec64 i_{a,c,m}time in the generic inode.
    1027                 :            :          */
    1028                 :            :         struct timespec64 i_crtime;
    1029                 :            : 
    1030                 :            :         /* mballoc */
    1031                 :            :         struct list_head i_prealloc_list;
    1032                 :            :         spinlock_t i_prealloc_lock;
    1033                 :            : 
    1034                 :            :         /* extents status tree */
    1035                 :            :         struct ext4_es_tree i_es_tree;
    1036                 :            :         rwlock_t i_es_lock;
    1037                 :            :         struct list_head i_es_list;
    1038                 :            :         unsigned int i_es_all_nr;       /* protected by i_es_lock */
    1039                 :            :         unsigned int i_es_shk_nr;       /* protected by i_es_lock */
    1040                 :            :         ext4_lblk_t i_es_shrink_lblk;   /* Offset where we start searching for
    1041                 :            :                                            extents to shrink. Protected by
    1042                 :            :                                            i_es_lock  */
    1043                 :            : 
    1044                 :            :         /* ialloc */
    1045                 :            :         ext4_group_t    i_last_alloc_group;
    1046                 :            : 
    1047                 :            :         /* allocation reservation info for delalloc */
    1048                 :            :         /* In case of bigalloc, this refer to clusters rather than blocks */
    1049                 :            :         unsigned int i_reserved_data_blocks;
    1050                 :            :         ext4_lblk_t i_da_metadata_calc_last_lblock;
    1051                 :            :         int i_da_metadata_calc_len;
    1052                 :            : 
    1053                 :            :         /* pending cluster reservations for bigalloc file systems */
    1054                 :            :         struct ext4_pending_tree i_pending_tree;
    1055                 :            : 
    1056                 :            :         /* on-disk additional length */
    1057                 :            :         __u16 i_extra_isize;
    1058                 :            : 
    1059                 :            :         /* Indicate the inline data space. */
    1060                 :            :         u16 i_inline_off;
    1061                 :            :         u16 i_inline_size;
    1062                 :            : 
    1063                 :            : #ifdef CONFIG_QUOTA
    1064                 :            :         /* quota space reservation, managed internally by quota code */
    1065                 :            :         qsize_t i_reserved_quota;
    1066                 :            : #endif
    1067                 :            : 
    1068                 :            :         /* Lock protecting lists below */
    1069                 :            :         spinlock_t i_completed_io_lock;
    1070                 :            :         /*
    1071                 :            :          * Completed IOs that need unwritten extents handling and have
    1072                 :            :          * transaction reserved
    1073                 :            :          */
    1074                 :            :         struct list_head i_rsv_conversion_list;
    1075                 :            :         struct work_struct i_rsv_conversion_work;
    1076                 :            :         atomic_t i_unwritten; /* Nr. of inflight conversions pending */
    1077                 :            : 
    1078                 :            :         spinlock_t i_block_reservation_lock;
    1079                 :            : 
    1080                 :            :         /*
    1081                 :            :          * Transactions that contain inode's metadata needed to complete
    1082                 :            :          * fsync and fdatasync, respectively.
    1083                 :            :          */
    1084                 :            :         tid_t i_sync_tid;
    1085                 :            :         tid_t i_datasync_tid;
    1086                 :            : 
    1087                 :            : #ifdef CONFIG_QUOTA
    1088                 :            :         struct dquot *i_dquot[MAXQUOTAS];
    1089                 :            : #endif
    1090                 :            : 
    1091                 :            :         /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
    1092                 :            :         __u32 i_csum_seed;
    1093                 :            : 
    1094                 :            :         kprojid_t i_projid;
    1095                 :            : };
    1096                 :            : 
    1097                 :            : /*
    1098                 :            :  * File system states
    1099                 :            :  */
    1100                 :            : #define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */
    1101                 :            : #define EXT4_ERROR_FS                   0x0002  /* Errors detected */
    1102                 :            : #define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
    1103                 :            : 
    1104                 :            : /*
    1105                 :            :  * Misc. filesystem flags
    1106                 :            :  */
    1107                 :            : #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
    1108                 :            : #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
    1109                 :            : #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* to test development code */
    1110                 :            : 
    1111                 :            : /*
    1112                 :            :  * Mount flags set via mount options or defaults
    1113                 :            :  */
    1114                 :            : #define EXT4_MOUNT_NO_MBCACHE           0x00001 /* Do not use mbcache */
    1115                 :            : #define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */
    1116                 :            : #define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */
    1117                 :            : #define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */
    1118                 :            : #define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */
    1119                 :            : #define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */
    1120                 :            : #define EXT4_MOUNT_ERRORS_MASK          0x00070
    1121                 :            : #define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */
    1122                 :            : #define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/
    1123                 :            : #ifdef CONFIG_FS_DAX
    1124                 :            : #define EXT4_MOUNT_DAX                  0x00200 /* Direct Access */
    1125                 :            : #else
    1126                 :            : #define EXT4_MOUNT_DAX                  0
    1127                 :            : #endif
    1128                 :            : #define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */
    1129                 :            : #define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */
    1130                 :            : #define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */
    1131                 :            : #define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */
    1132                 :            : #define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */
    1133                 :            : #define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */
    1134                 :            : #define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */
    1135                 :            : #define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */
    1136                 :            : #define EXT4_MOUNT_NO_AUTO_DA_ALLOC     0x10000 /* No auto delalloc mapping */
    1137                 :            : #define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */
    1138                 :            : #define EXT4_MOUNT_QUOTA                0x40000 /* Some quota option set */
    1139                 :            : #define EXT4_MOUNT_USRQUOTA             0x80000 /* "old" user quota,
    1140                 :            :                                                  * enable enforcement for hidden
    1141                 :            :                                                  * quota files */
    1142                 :            : #define EXT4_MOUNT_GRPQUOTA             0x100000 /* "old" group quota, enable
    1143                 :            :                                                   * enforcement for hidden quota
    1144                 :            :                                                   * files */
    1145                 :            : #define EXT4_MOUNT_PRJQUOTA             0x200000 /* Enable project quota
    1146                 :            :                                                   * enforcement */
    1147                 :            : #define EXT4_MOUNT_DIOREAD_NOLOCK       0x400000 /* Enable support for dio read nolocking */
    1148                 :            : #define EXT4_MOUNT_JOURNAL_CHECKSUM     0x800000 /* Journal checksums */
    1149                 :            : #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
    1150                 :            : #define EXT4_MOUNT_WARN_ON_ERROR        0x2000000 /* Trigger WARN_ON on error */
    1151                 :            : #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
    1152                 :            : #define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
    1153                 :            : #define EXT4_MOUNT_BLOCK_VALIDITY       0x20000000 /* Block validity checking */
    1154                 :            : #define EXT4_MOUNT_DISCARD              0x40000000 /* Issue DISCARD requests */
    1155                 :            : #define EXT4_MOUNT_INIT_INODE_TABLE     0x80000000 /* Initialize uninitialized itables */
    1156                 :            : 
    1157                 :            : /*
    1158                 :            :  * Mount flags set either automatically (could not be set by mount option)
    1159                 :            :  * based on per file system feature or property or in special cases such as
    1160                 :            :  * distinguishing between explicit mount option definition and default.
    1161                 :            :  */
    1162                 :            : #define EXT4_MOUNT2_EXPLICIT_DELALLOC   0x00000001 /* User explicitly
    1163                 :            :                                                       specified delalloc */
    1164                 :            : #define EXT4_MOUNT2_STD_GROUP_SIZE      0x00000002 /* We have standard group
    1165                 :            :                                                       size of blocksize * 8
    1166                 :            :                                                       blocks */
    1167                 :            : #define EXT4_MOUNT2_HURD_COMPAT         0x00000004 /* Support HURD-castrated
    1168                 :            :                                                       file systems */
    1169                 :            : 
    1170                 :            : #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM   0x00000008 /* User explicitly
    1171                 :            :                                                 specified journal checksum */
    1172                 :            : 
    1173                 :            : #define clear_opt(sb, opt)              EXT4_SB(sb)->s_mount_opt &= \
    1174                 :            :                                                 ~EXT4_MOUNT_##opt
    1175                 :            : #define set_opt(sb, opt)                EXT4_SB(sb)->s_mount_opt |= \
    1176                 :            :                                                 EXT4_MOUNT_##opt
    1177                 :            : #define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \
    1178                 :            :                                          EXT4_MOUNT_##opt)
    1179                 :            : 
    1180                 :            : #define clear_opt2(sb, opt)             EXT4_SB(sb)->s_mount_opt2 &= \
    1181                 :            :                                                 ~EXT4_MOUNT2_##opt
    1182                 :            : #define set_opt2(sb, opt)               EXT4_SB(sb)->s_mount_opt2 |= \
    1183                 :            :                                                 EXT4_MOUNT2_##opt
    1184                 :            : #define test_opt2(sb, opt)              (EXT4_SB(sb)->s_mount_opt2 & \
    1185                 :            :                                          EXT4_MOUNT2_##opt)
    1186                 :            : 
    1187                 :            : #define ext4_test_and_set_bit           __test_and_set_bit_le
    1188                 :            : #define ext4_set_bit                    __set_bit_le
    1189                 :            : #define ext4_set_bit_atomic             ext2_set_bit_atomic
    1190                 :            : #define ext4_test_and_clear_bit         __test_and_clear_bit_le
    1191                 :            : #define ext4_clear_bit                  __clear_bit_le
    1192                 :            : #define ext4_clear_bit_atomic           ext2_clear_bit_atomic
    1193                 :            : #define ext4_test_bit                   test_bit_le
    1194                 :            : #define ext4_find_next_zero_bit         find_next_zero_bit_le
    1195                 :            : #define ext4_find_next_bit              find_next_bit_le
    1196                 :            : 
    1197                 :            : extern void ext4_set_bits(void *bm, int cur, int len);
    1198                 :            : 
    1199                 :            : /*
    1200                 :            :  * Maximal mount counts between two filesystem checks
    1201                 :            :  */
    1202                 :            : #define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
    1203                 :            : #define EXT4_DFL_CHECKINTERVAL          0       /* Don't use interval check */
    1204                 :            : 
    1205                 :            : /*
    1206                 :            :  * Behaviour when detecting errors
    1207                 :            :  */
    1208                 :            : #define EXT4_ERRORS_CONTINUE            1       /* Continue execution */
    1209                 :            : #define EXT4_ERRORS_RO                  2       /* Remount fs read-only */
    1210                 :            : #define EXT4_ERRORS_PANIC               3       /* Panic */
    1211                 :            : #define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE
    1212                 :            : 
    1213                 :            : /* Metadata checksum algorithm codes */
    1214                 :            : #define EXT4_CRC32C_CHKSUM              1
    1215                 :            : 
    1216                 :            : /*
    1217                 :            :  * Structure of the super block
    1218                 :            :  */
    1219                 :            : struct ext4_super_block {
    1220                 :            : /*00*/  __le32  s_inodes_count;         /* Inodes count */
    1221                 :            :         __le32  s_blocks_count_lo;      /* Blocks count */
    1222                 :            :         __le32  s_r_blocks_count_lo;    /* Reserved blocks count */
    1223                 :            :         __le32  s_free_blocks_count_lo; /* Free blocks count */
    1224                 :            : /*10*/  __le32  s_free_inodes_count;    /* Free inodes count */
    1225                 :            :         __le32  s_first_data_block;     /* First Data Block */
    1226                 :            :         __le32  s_log_block_size;       /* Block size */
    1227                 :            :         __le32  s_log_cluster_size;     /* Allocation cluster size */
    1228                 :            : /*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */
    1229                 :            :         __le32  s_clusters_per_group;   /* # Clusters per group */
    1230                 :            :         __le32  s_inodes_per_group;     /* # Inodes per group */
    1231                 :            :         __le32  s_mtime;                /* Mount time */
    1232                 :            : /*30*/  __le32  s_wtime;                /* Write time */
    1233                 :            :         __le16  s_mnt_count;            /* Mount count */
    1234                 :            :         __le16  s_max_mnt_count;        /* Maximal mount count */
    1235                 :            :         __le16  s_magic;                /* Magic signature */
    1236                 :            :         __le16  s_state;                /* File system state */
    1237                 :            :         __le16  s_errors;               /* Behaviour when detecting errors */
    1238                 :            :         __le16  s_minor_rev_level;      /* minor revision level */
    1239                 :            : /*40*/  __le32  s_lastcheck;            /* time of last check */
    1240                 :            :         __le32  s_checkinterval;        /* max. time between checks */
    1241                 :            :         __le32  s_creator_os;           /* OS */
    1242                 :            :         __le32  s_rev_level;            /* Revision level */
    1243                 :            : /*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */
    1244                 :            :         __le16  s_def_resgid;           /* Default gid for reserved blocks */
    1245                 :            :         /*
    1246                 :            :          * These fields are for EXT4_DYNAMIC_REV superblocks only.
    1247                 :            :          *
    1248                 :            :          * Note: the difference between the compatible feature set and
    1249                 :            :          * the incompatible feature set is that if there is a bit set
    1250                 :            :          * in the incompatible feature set that the kernel doesn't
    1251                 :            :          * know about, it should refuse to mount the filesystem.
    1252                 :            :          *
    1253                 :            :          * e2fsck's requirements are more strict; if it doesn't know
    1254                 :            :          * about a feature in either the compatible or incompatible
    1255                 :            :          * feature set, it must abort and not try to meddle with
    1256                 :            :          * things it doesn't understand...
    1257                 :            :          */
    1258                 :            :         __le32  s_first_ino;            /* First non-reserved inode */
    1259                 :            :         __le16  s_inode_size;           /* size of inode structure */
    1260                 :            :         __le16  s_block_group_nr;       /* block group # of this superblock */
    1261                 :            :         __le32  s_feature_compat;       /* compatible feature set */
    1262                 :            : /*60*/  __le32  s_feature_incompat;     /* incompatible feature set */
    1263                 :            :         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
    1264                 :            : /*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */
    1265                 :            : /*78*/  char    s_volume_name[16];      /* volume name */
    1266                 :            : /*88*/  char    s_last_mounted[64] __nonstring; /* directory where last mounted */
    1267                 :            : /*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */
    1268                 :            :         /*
    1269                 :            :          * Performance hints.  Directory preallocation should only
    1270                 :            :          * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
    1271                 :            :          */
    1272                 :            :         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
    1273                 :            :         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
    1274                 :            :         __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */
    1275                 :            :         /*
    1276                 :            :          * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
    1277                 :            :          */
    1278                 :            : /*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */
    1279                 :            : /*E0*/  __le32  s_journal_inum;         /* inode number of journal file */
    1280                 :            :         __le32  s_journal_dev;          /* device number of journal file */
    1281                 :            :         __le32  s_last_orphan;          /* start of list of inodes to delete */
    1282                 :            :         __le32  s_hash_seed[4];         /* HTREE hash seed */
    1283                 :            :         __u8    s_def_hash_version;     /* Default hash version to use */
    1284                 :            :         __u8    s_jnl_backup_type;
    1285                 :            :         __le16  s_desc_size;            /* size of group descriptor */
    1286                 :            : /*100*/ __le32  s_default_mount_opts;
    1287                 :            :         __le32  s_first_meta_bg;        /* First metablock block group */
    1288                 :            :         __le32  s_mkfs_time;            /* When the filesystem was created */
    1289                 :            :         __le32  s_jnl_blocks[17];       /* Backup of the journal inode */
    1290                 :            :         /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
    1291                 :            : /*150*/ __le32  s_blocks_count_hi;      /* Blocks count */
    1292                 :            :         __le32  s_r_blocks_count_hi;    /* Reserved blocks count */
    1293                 :            :         __le32  s_free_blocks_count_hi; /* Free blocks count */
    1294                 :            :         __le16  s_min_extra_isize;      /* All inodes have at least # bytes */
    1295                 :            :         __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */
    1296                 :            :         __le32  s_flags;                /* Miscellaneous flags */
    1297                 :            :         __le16  s_raid_stride;          /* RAID stride */
    1298                 :            :         __le16  s_mmp_update_interval;  /* # seconds to wait in MMP checking */
    1299                 :            :         __le64  s_mmp_block;            /* Block for multi-mount protection */
    1300                 :            :         __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
    1301                 :            :         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
    1302                 :            :         __u8    s_checksum_type;        /* metadata checksum algorithm used */
    1303                 :            :         __u8    s_encryption_level;     /* versioning level for encryption */
    1304                 :            :         __u8    s_reserved_pad;         /* Padding to next 32bits */
    1305                 :            :         __le64  s_kbytes_written;       /* nr of lifetime kilobytes written */
    1306                 :            :         __le32  s_snapshot_inum;        /* Inode number of active snapshot */
    1307                 :            :         __le32  s_snapshot_id;          /* sequential ID of active snapshot */
    1308                 :            :         __le64  s_snapshot_r_blocks_count; /* reserved blocks for active
    1309                 :            :                                               snapshot's future use */
    1310                 :            :         __le32  s_snapshot_list;        /* inode number of the head of the
    1311                 :            :                                            on-disk snapshot list */
    1312                 :            : #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
    1313                 :            :         __le32  s_error_count;          /* number of fs errors */
    1314                 :            :         __le32  s_first_error_time;     /* first time an error happened */
    1315                 :            :         __le32  s_first_error_ino;      /* inode involved in first error */
    1316                 :            :         __le64  s_first_error_block;    /* block involved of first error */
    1317                 :            :         __u8    s_first_error_func[32] __nonstring;     /* function where the error happened */
    1318                 :            :         __le32  s_first_error_line;     /* line number where error happened */
    1319                 :            :         __le32  s_last_error_time;      /* most recent time of an error */
    1320                 :            :         __le32  s_last_error_ino;       /* inode involved in last error */
    1321                 :            :         __le32  s_last_error_line;      /* line number where error happened */
    1322                 :            :         __le64  s_last_error_block;     /* block involved of last error */
    1323                 :            :         __u8    s_last_error_func[32] __nonstring;      /* function where the error happened */
    1324                 :            : #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
    1325                 :            :         __u8    s_mount_opts[64];
    1326                 :            :         __le32  s_usr_quota_inum;       /* inode for tracking user quota */
    1327                 :            :         __le32  s_grp_quota_inum;       /* inode for tracking group quota */
    1328                 :            :         __le32  s_overhead_clusters;    /* overhead blocks/clusters in fs */
    1329                 :            :         __le32  s_backup_bgs[2];        /* groups with sparse_super2 SBs */
    1330                 :            :         __u8    s_encrypt_algos[4];     /* Encryption algorithms in use  */
    1331                 :            :         __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
    1332                 :            :         __le32  s_lpf_ino;              /* Location of the lost+found inode */
    1333                 :            :         __le32  s_prj_quota_inum;       /* inode for tracking project quota */
    1334                 :            :         __le32  s_checksum_seed;        /* crc32c(uuid) if csum_seed set */
    1335                 :            :         __u8    s_wtime_hi;
    1336                 :            :         __u8    s_mtime_hi;
    1337                 :            :         __u8    s_mkfs_time_hi;
    1338                 :            :         __u8    s_lastcheck_hi;
    1339                 :            :         __u8    s_first_error_time_hi;
    1340                 :            :         __u8    s_last_error_time_hi;
    1341                 :            :         __u8    s_pad[2];
    1342                 :            :         __le16  s_encoding;             /* Filename charset encoding */
    1343                 :            :         __le16  s_encoding_flags;       /* Filename charset encoding flags */
    1344                 :            :         __le32  s_reserved[95];         /* Padding to the end of the block */
    1345                 :            :         __le32  s_checksum;             /* crc32c(superblock) */
    1346                 :            : };
    1347                 :            : 
    1348                 :            : #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
    1349                 :            : 
    1350                 :            : #ifdef __KERNEL__
    1351                 :            : 
    1352                 :            : /*
    1353                 :            :  * run-time mount flags
    1354                 :            :  */
    1355                 :            : #define EXT4_MF_MNTDIR_SAMPLED          0x0001
    1356                 :            : #define EXT4_MF_FS_ABORTED              0x0002  /* Fatal error detected */
    1357                 :            : #define EXT4_MF_TEST_DUMMY_ENCRYPTION   0x0004
    1358                 :            : 
    1359                 :            : #ifdef CONFIG_FS_ENCRYPTION
    1360                 :            : #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
    1361                 :            :                                                 EXT4_MF_TEST_DUMMY_ENCRYPTION))
    1362                 :            : #else
    1363                 :            : #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
    1364                 :            : #endif
    1365                 :            : 
    1366                 :            : /* Number of quota types we support */
    1367                 :            : #define EXT4_MAXQUOTAS 3
    1368                 :            : 
    1369                 :            : #define EXT4_ENC_UTF8_12_1      1
    1370                 :            : 
    1371                 :            : /*
    1372                 :            :  * Flags for ext4_sb_info.s_encoding_flags.
    1373                 :            :  */
    1374                 :            : #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
    1375                 :            : 
    1376                 :            : #define ext4_has_strict_mode(sbi) \
    1377                 :            :         (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
    1378                 :            : 
    1379                 :            : /*
    1380                 :            :  * fourth extended-fs super-block data in memory
    1381                 :            :  */
    1382                 :            : struct ext4_sb_info {
    1383                 :            :         unsigned long s_desc_size;      /* Size of a group descriptor in bytes */
    1384                 :            :         unsigned long s_inodes_per_block;/* Number of inodes per block */
    1385                 :            :         unsigned long s_blocks_per_group;/* Number of blocks in a group */
    1386                 :            :         unsigned long s_clusters_per_group; /* Number of clusters in a group */
    1387                 :            :         unsigned long s_inodes_per_group;/* Number of inodes in a group */
    1388                 :            :         unsigned long s_itb_per_group;  /* Number of inode table blocks per group */
    1389                 :            :         unsigned long s_gdb_count;      /* Number of group descriptor blocks */
    1390                 :            :         unsigned long s_desc_per_block; /* Number of group descriptors per block */
    1391                 :            :         ext4_group_t s_groups_count;    /* Number of groups in the fs */
    1392                 :            :         ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
    1393                 :            :         unsigned long s_overhead;  /* # of fs overhead clusters */
    1394                 :            :         unsigned int s_cluster_ratio;   /* Number of blocks per cluster */
    1395                 :            :         unsigned int s_cluster_bits;    /* log2 of s_cluster_ratio */
    1396                 :            :         loff_t s_bitmap_maxbytes;       /* max bytes for bitmap files */
    1397                 :            :         struct buffer_head * s_sbh;     /* Buffer containing the super block */
    1398                 :            :         struct ext4_super_block *s_es;  /* Pointer to the super block in the buffer */
    1399                 :            :         struct buffer_head * __rcu *s_group_desc;
    1400                 :            :         unsigned int s_mount_opt;
    1401                 :            :         unsigned int s_mount_opt2;
    1402                 :            :         unsigned int s_mount_flags;
    1403                 :            :         unsigned int s_def_mount_opt;
    1404                 :            :         ext4_fsblk_t s_sb_block;
    1405                 :            :         atomic64_t s_resv_clusters;
    1406                 :            :         kuid_t s_resuid;
    1407                 :            :         kgid_t s_resgid;
    1408                 :            :         unsigned short s_mount_state;
    1409                 :            :         unsigned short s_pad;
    1410                 :            :         int s_addr_per_block_bits;
    1411                 :            :         int s_desc_per_block_bits;
    1412                 :            :         int s_inode_size;
    1413                 :            :         int s_first_ino;
    1414                 :            :         unsigned int s_inode_readahead_blks;
    1415                 :            :         unsigned int s_inode_goal;
    1416                 :            :         u32 s_hash_seed[4];
    1417                 :            :         int s_def_hash_version;
    1418                 :            :         int s_hash_unsigned;    /* 3 if hash should be signed, 0 if not */
    1419                 :            :         struct percpu_counter s_freeclusters_counter;
    1420                 :            :         struct percpu_counter s_freeinodes_counter;
    1421                 :            :         struct percpu_counter s_dirs_counter;
    1422                 :            :         struct percpu_counter s_dirtyclusters_counter;
    1423                 :            :         struct blockgroup_lock *s_blockgroup_lock;
    1424                 :            :         struct proc_dir_entry *s_proc;
    1425                 :            :         struct kobject s_kobj;
    1426                 :            :         struct completion s_kobj_unregister;
    1427                 :            :         struct super_block *s_sb;
    1428                 :            : #ifdef CONFIG_UNICODE
    1429                 :            :         struct unicode_map *s_encoding;
    1430                 :            :         __u16 s_encoding_flags;
    1431                 :            : #endif
    1432                 :            : 
    1433                 :            :         /* Journaling */
    1434                 :            :         struct journal_s *s_journal;
    1435                 :            :         struct list_head s_orphan;
    1436                 :            :         struct mutex s_orphan_lock;
    1437                 :            :         unsigned long s_ext4_flags;             /* Ext4 superblock flags */
    1438                 :            :         unsigned long s_commit_interval;
    1439                 :            :         u32 s_max_batch_time;
    1440                 :            :         u32 s_min_batch_time;
    1441                 :            :         struct block_device *journal_bdev;
    1442                 :            : #ifdef CONFIG_QUOTA
    1443                 :            :         /* Names of quota files with journalled quota */
    1444                 :            :         char __rcu *s_qf_names[EXT4_MAXQUOTAS];
    1445                 :            :         int s_jquota_fmt;                       /* Format of quota to use */
    1446                 :            : #endif
    1447                 :            :         unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
    1448                 :            :         struct ext4_system_blocks __rcu *system_blks;
    1449                 :            : 
    1450                 :            : #ifdef EXTENTS_STATS
    1451                 :            :         /* ext4 extents stats */
    1452                 :            :         unsigned long s_ext_min;
    1453                 :            :         unsigned long s_ext_max;
    1454                 :            :         unsigned long s_depth_max;
    1455                 :            :         spinlock_t s_ext_stats_lock;
    1456                 :            :         unsigned long s_ext_blocks;
    1457                 :            :         unsigned long s_ext_extents;
    1458                 :            : #endif
    1459                 :            : 
    1460                 :            :         /* for buddy allocator */
    1461                 :            :         struct ext4_group_info ** __rcu *s_group_info;
    1462                 :            :         struct inode *s_buddy_cache;
    1463                 :            :         spinlock_t s_md_lock;
    1464                 :            :         unsigned short *s_mb_offsets;
    1465                 :            :         unsigned int *s_mb_maxs;
    1466                 :            :         unsigned int s_group_info_size;
    1467                 :            :         unsigned int s_mb_free_pending;
    1468                 :            :         struct list_head s_freed_data_list;     /* List of blocks to be freed
    1469                 :            :                                                    after commit completed */
    1470                 :            : 
    1471                 :            :         /* tunables */
    1472                 :            :         unsigned long s_stripe;
    1473                 :            :         unsigned int s_mb_stream_request;
    1474                 :            :         unsigned int s_mb_max_to_scan;
    1475                 :            :         unsigned int s_mb_min_to_scan;
    1476                 :            :         unsigned int s_mb_stats;
    1477                 :            :         unsigned int s_mb_order2_reqs;
    1478                 :            :         unsigned int s_mb_group_prealloc;
    1479                 :            :         unsigned int s_max_dir_size_kb;
    1480                 :            :         /* where last allocation was done - for stream allocation */
    1481                 :            :         unsigned long s_mb_last_group;
    1482                 :            :         unsigned long s_mb_last_start;
    1483                 :            : 
    1484                 :            :         /* stats for buddy allocator */
    1485                 :            :         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */
    1486                 :            :         atomic_t s_bal_success; /* we found long enough chunks */
    1487                 :            :         atomic_t s_bal_allocated;       /* in blocks */
    1488                 :            :         atomic_t s_bal_ex_scanned;      /* total extents scanned */
    1489                 :            :         atomic_t s_bal_goals;   /* goal hits */
    1490                 :            :         atomic_t s_bal_breaks;  /* too long searches */
    1491                 :            :         atomic_t s_bal_2orders; /* 2^order hits */
    1492                 :            :         spinlock_t s_bal_lock;
    1493                 :            :         unsigned long s_mb_buddies_generated;
    1494                 :            :         unsigned long long s_mb_generation_time;
    1495                 :            :         atomic_t s_mb_lost_chunks;
    1496                 :            :         atomic_t s_mb_preallocated;
    1497                 :            :         atomic_t s_mb_discarded;
    1498                 :            :         atomic_t s_lock_busy;
    1499                 :            : 
    1500                 :            :         /* locality groups */
    1501                 :            :         struct ext4_locality_group __percpu *s_locality_groups;
    1502                 :            : 
    1503                 :            :         /* for write statistics */
    1504                 :            :         unsigned long s_sectors_written_start;
    1505                 :            :         u64 s_kbytes_written;
    1506                 :            : 
    1507                 :            :         /* the size of zero-out chunk */
    1508                 :            :         unsigned int s_extent_max_zeroout_kb;
    1509                 :            : 
    1510                 :            :         unsigned int s_log_groups_per_flex;
    1511                 :            :         struct flex_groups * __rcu *s_flex_groups;
    1512                 :            :         ext4_group_t s_flex_groups_allocated;
    1513                 :            : 
    1514                 :            :         /* workqueue for reserved extent conversions (buffered io) */
    1515                 :            :         struct workqueue_struct *rsv_conversion_wq;
    1516                 :            : 
    1517                 :            :         /* timer for periodic error stats printing */
    1518                 :            :         struct timer_list s_err_report;
    1519                 :            : 
    1520                 :            :         /* Lazy inode table initialization info */
    1521                 :            :         struct ext4_li_request *s_li_request;
    1522                 :            :         /* Wait multiplier for lazy initialization thread */
    1523                 :            :         unsigned int s_li_wait_mult;
    1524                 :            : 
    1525                 :            :         /* Kernel thread for multiple mount protection */
    1526                 :            :         struct task_struct *s_mmp_tsk;
    1527                 :            : 
    1528                 :            :         /* record the last minlen when FITRIM is called. */
    1529                 :            :         atomic_t s_last_trim_minblks;
    1530                 :            : 
    1531                 :            :         /* Reference to checksum algorithm driver via cryptoapi */
    1532                 :            :         struct crypto_shash *s_chksum_driver;
    1533                 :            : 
    1534                 :            :         /* Precomputed FS UUID checksum for seeding other checksums */
    1535                 :            :         __u32 s_csum_seed;
    1536                 :            : 
    1537                 :            :         /* Reclaim extents from extent status tree */
    1538                 :            :         struct shrinker s_es_shrinker;
    1539                 :            :         struct list_head s_es_list;     /* List of inodes with reclaimable extents */
    1540                 :            :         long s_es_nr_inode;
    1541                 :            :         struct ext4_es_stats s_es_stats;
    1542                 :            :         struct mb_cache *s_ea_block_cache;
    1543                 :            :         struct mb_cache *s_ea_inode_cache;
    1544                 :            :         spinlock_t s_es_lock ____cacheline_aligned_in_smp;
    1545                 :            : 
    1546                 :            :         /* Ratelimit ext4 messages. */
    1547                 :            :         struct ratelimit_state s_err_ratelimit_state;
    1548                 :            :         struct ratelimit_state s_warning_ratelimit_state;
    1549                 :            :         struct ratelimit_state s_msg_ratelimit_state;
    1550                 :            : 
    1551                 :            :         /*
    1552                 :            :          * Barrier between writepages ops and changing any inode's JOURNAL_DATA
    1553                 :            :          * or EXTENTS flag.
    1554                 :            :          */
    1555                 :            :         struct percpu_rw_semaphore s_writepages_rwsem;
    1556                 :            :         struct dax_device *s_daxdev;
    1557                 :            : };
    1558                 :            : 
    1559                 :            : static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
    1560                 :            : {
    1561                 :          3 :         return sb->s_fs_info;
    1562                 :            : }
    1563                 :            : static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
    1564                 :            : {
    1565                 :            :         return container_of(inode, struct ext4_inode_info, vfs_inode);
    1566                 :            : }
    1567                 :            : 
    1568                 :            : static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
    1569                 :            : {
    1570                 :          3 :         return ino == EXT4_ROOT_INO ||
    1571                 :          3 :                 (ino >= EXT4_FIRST_INO(sb) &&
    1572                 :          3 :                  ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
    1573                 :            : }
    1574                 :            : 
    1575                 :            : /*
    1576                 :            :  * Returns: sbi->field[index]
    1577                 :            :  * Used to access an array element from the following sbi fields which require
    1578                 :            :  * rcu protection to avoid dereferencing an invalid pointer due to reassignment
    1579                 :            :  * - s_group_desc
    1580                 :            :  * - s_group_info
    1581                 :            :  * - s_flex_group
    1582                 :            :  */
    1583                 :            : #define sbi_array_rcu_deref(sbi, field, index)                             \
    1584                 :            : ({                                                                         \
    1585                 :            :         typeof(*((sbi)->field)) _v;                                     \
    1586                 :            :         rcu_read_lock();                                                   \
    1587                 :            :         _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index];       \
    1588                 :            :         rcu_read_unlock();                                                 \
    1589                 :            :         _v;                                                                \
    1590                 :            : })
    1591                 :            : 
    1592                 :            : /*
    1593                 :            :  * Inode dynamic state flags
    1594                 :            :  */
    1595                 :            : enum {
    1596                 :            :         EXT4_STATE_JDATA,               /* journaled data exists */
    1597                 :            :         EXT4_STATE_NEW,                 /* inode is newly created */
    1598                 :            :         EXT4_STATE_XATTR,               /* has in-inode xattrs */
    1599                 :            :         EXT4_STATE_NO_EXPAND,           /* No space for expansion */
    1600                 :            :         EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
    1601                 :            :         EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
    1602                 :            :         EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
    1603                 :            :         EXT4_STATE_NEWENTRY,            /* File just added to dir */
    1604                 :            :         EXT4_STATE_MAY_INLINE_DATA,     /* may have in-inode data */
    1605                 :            :         EXT4_STATE_EXT_PRECACHED,       /* extents have been precached */
    1606                 :            :         EXT4_STATE_LUSTRE_EA_INODE,     /* Lustre-style ea_inode */
    1607                 :            :         EXT4_STATE_VERITY_IN_PROGRESS,  /* building fs-verity Merkle tree */
    1608                 :            : };
    1609                 :            : 
    1610                 :            : #define EXT4_INODE_BIT_FNS(name, field, offset)                         \
    1611                 :            : static inline int ext4_test_inode_##name(struct inode *inode, int bit)  \
    1612                 :            : {                                                                       \
    1613                 :            :         return test_bit(bit + (offset), &EXT4_I(inode)->i_##field);      \
    1614                 :            : }                                                                       \
    1615                 :            : static inline void ext4_set_inode_##name(struct inode *inode, int bit)  \
    1616                 :            : {                                                                       \
    1617                 :            :         set_bit(bit + (offset), &EXT4_I(inode)->i_##field);              \
    1618                 :            : }                                                                       \
    1619                 :            : static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
    1620                 :            : {                                                                       \
    1621                 :            :         clear_bit(bit + (offset), &EXT4_I(inode)->i_##field);            \
    1622                 :            : }
    1623                 :            : 
    1624                 :            : /* Add these declarations here only so that these functions can be
    1625                 :            :  * found by name.  Otherwise, they are very hard to locate. */
    1626                 :            : static inline int ext4_test_inode_flag(struct inode *inode, int bit);
    1627                 :            : static inline void ext4_set_inode_flag(struct inode *inode, int bit);
    1628                 :            : static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
    1629                 :          3 : EXT4_INODE_BIT_FNS(flag, flags, 0)
    1630                 :            : 
    1631                 :            : /* Add these declarations here only so that these functions can be
    1632                 :            :  * found by name.  Otherwise, they are very hard to locate. */
    1633                 :            : static inline int ext4_test_inode_state(struct inode *inode, int bit);
    1634                 :            : static inline void ext4_set_inode_state(struct inode *inode, int bit);
    1635                 :            : static inline void ext4_clear_inode_state(struct inode *inode, int bit);
    1636                 :            : #if (BITS_PER_LONG < 64)
    1637                 :          3 : EXT4_INODE_BIT_FNS(state, state_flags, 0)
    1638                 :            : 
    1639                 :            : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
    1640                 :            : {
    1641                 :          3 :         (ei)->i_state_flags = 0;
    1642                 :            : }
    1643                 :            : #else
    1644                 :            : EXT4_INODE_BIT_FNS(state, flags, 32)
    1645                 :            : 
    1646                 :            : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
    1647                 :            : {
    1648                 :            :         /* We depend on the fact that callers will set i_flags */
    1649                 :            : }
    1650                 :            : #endif
    1651                 :            : #else
    1652                 :            : /* Assume that user mode programs are passing in an ext4fs superblock, not
    1653                 :            :  * a kernel struct super_block.  This will allow us to call the feature-test
    1654                 :            :  * macros from user land. */
    1655                 :            : #define EXT4_SB(sb)     (sb)
    1656                 :            : #endif
    1657                 :            : 
    1658                 :            : static inline bool ext4_verity_in_progress(struct inode *inode)
    1659                 :            : {
    1660                 :            :         return IS_ENABLED(CONFIG_FS_VERITY) &&
    1661                 :            :                ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
    1662                 :            : }
    1663                 :            : 
    1664                 :            : #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
    1665                 :            : 
    1666                 :            : /*
    1667                 :            :  * Codes for operating systems
    1668                 :            :  */
    1669                 :            : #define EXT4_OS_LINUX           0
    1670                 :            : #define EXT4_OS_HURD            1
    1671                 :            : #define EXT4_OS_MASIX           2
    1672                 :            : #define EXT4_OS_FREEBSD         3
    1673                 :            : #define EXT4_OS_LITES           4
    1674                 :            : 
    1675                 :            : /*
    1676                 :            :  * Revision levels
    1677                 :            :  */
    1678                 :            : #define EXT4_GOOD_OLD_REV       0       /* The good old (original) format */
    1679                 :            : #define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
    1680                 :            : 
    1681                 :            : #define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV
    1682                 :            : #define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV
    1683                 :            : 
    1684                 :            : #define EXT4_GOOD_OLD_INODE_SIZE 128
    1685                 :            : 
    1686                 :            : #define EXT4_EXTRA_TIMESTAMP_MAX        (((s64)1 << 34) - 1  + S32_MIN)
    1687                 :            : #define EXT4_NON_EXTRA_TIMESTAMP_MAX    S32_MAX
    1688                 :            : #define EXT4_TIMESTAMP_MIN              S32_MIN
    1689                 :            : 
    1690                 :            : /*
    1691                 :            :  * Feature set definitions
    1692                 :            :  */
    1693                 :            : 
    1694                 :            : #define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001
    1695                 :            : #define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002
    1696                 :            : #define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004
    1697                 :            : #define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008
    1698                 :            : #define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010
    1699                 :            : #define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020
    1700                 :            : #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2       0x0200
    1701                 :            : 
    1702                 :            : #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
    1703                 :            : #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
    1704                 :            : #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
    1705                 :            : #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
    1706                 :            : #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
    1707                 :            : #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
    1708                 :            : #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
    1709                 :            : #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
    1710                 :            : #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
    1711                 :            : /*
    1712                 :            :  * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM).  When
    1713                 :            :  * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
    1714                 :            :  * all other data structures' checksums.  However, the METADATA_CSUM and
    1715                 :            :  * GDT_CSUM bits are mutually exclusive.
    1716                 :            :  */
    1717                 :            : #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
    1718                 :            : #define EXT4_FEATURE_RO_COMPAT_READONLY         0x1000
    1719                 :            : #define EXT4_FEATURE_RO_COMPAT_PROJECT          0x2000
    1720                 :            : #define EXT4_FEATURE_RO_COMPAT_VERITY           0x8000
    1721                 :            : 
    1722                 :            : #define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001
    1723                 :            : #define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002
    1724                 :            : #define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
    1725                 :            : #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
    1726                 :            : #define EXT4_FEATURE_INCOMPAT_META_BG           0x0010
    1727                 :            : #define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */
    1728                 :            : #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
    1729                 :            : #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
    1730                 :            : #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
    1731                 :            : #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400 /* EA in inode */
    1732                 :            : #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000 /* data in dirent */
    1733                 :            : #define EXT4_FEATURE_INCOMPAT_CSUM_SEED         0x2000
    1734                 :            : #define EXT4_FEATURE_INCOMPAT_LARGEDIR          0x4000 /* >2GB or 3-lvl htree */
    1735                 :            : #define EXT4_FEATURE_INCOMPAT_INLINE_DATA       0x8000 /* data in inode */
    1736                 :            : #define EXT4_FEATURE_INCOMPAT_ENCRYPT           0x10000
    1737                 :            : #define EXT4_FEATURE_INCOMPAT_CASEFOLD          0x20000
    1738                 :            : 
    1739                 :            : extern void ext4_update_dynamic_rev(struct super_block *sb);
    1740                 :            : 
    1741                 :            : #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
    1742                 :            : static inline bool ext4_has_feature_##name(struct super_block *sb) \
    1743                 :            : { \
    1744                 :            :         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
    1745                 :            :                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
    1746                 :            : } \
    1747                 :            : static inline void ext4_set_feature_##name(struct super_block *sb) \
    1748                 :            : { \
    1749                 :            :         ext4_update_dynamic_rev(sb); \
    1750                 :            :         EXT4_SB(sb)->s_es->s_feature_compat |= \
    1751                 :            :                 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
    1752                 :            : } \
    1753                 :            : static inline void ext4_clear_feature_##name(struct super_block *sb) \
    1754                 :            : { \
    1755                 :            :         EXT4_SB(sb)->s_es->s_feature_compat &= \
    1756                 :            :                 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
    1757                 :            : }
    1758                 :            : 
    1759                 :            : #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
    1760                 :            : static inline bool ext4_has_feature_##name(struct super_block *sb) \
    1761                 :            : { \
    1762                 :            :         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
    1763                 :            :                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
    1764                 :            : } \
    1765                 :            : static inline void ext4_set_feature_##name(struct super_block *sb) \
    1766                 :            : { \
    1767                 :            :         ext4_update_dynamic_rev(sb); \
    1768                 :            :         EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
    1769                 :            :                 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
    1770                 :            : } \
    1771                 :            : static inline void ext4_clear_feature_##name(struct super_block *sb) \
    1772                 :            : { \
    1773                 :            :         EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
    1774                 :            :                 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
    1775                 :            : }
    1776                 :            : 
    1777                 :            : #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
    1778                 :            : static inline bool ext4_has_feature_##name(struct super_block *sb) \
    1779                 :            : { \
    1780                 :            :         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
    1781                 :            :                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
    1782                 :            : } \
    1783                 :            : static inline void ext4_set_feature_##name(struct super_block *sb) \
    1784                 :            : { \
    1785                 :            :         ext4_update_dynamic_rev(sb); \
    1786                 :            :         EXT4_SB(sb)->s_es->s_feature_incompat |= \
    1787                 :            :                 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
    1788                 :            : } \
    1789                 :            : static inline void ext4_clear_feature_##name(struct super_block *sb) \
    1790                 :            : { \
    1791                 :            :         EXT4_SB(sb)->s_es->s_feature_incompat &= \
    1792                 :            :                 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
    1793                 :            : }
    1794                 :            : 
    1795                 :            : EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,         DIR_PREALLOC)
    1796                 :            : EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes,        IMAGIC_INODES)
    1797                 :          3 : EXT4_FEATURE_COMPAT_FUNCS(journal,              HAS_JOURNAL)
    1798                 :          0 : EXT4_FEATURE_COMPAT_FUNCS(xattr,                EXT_ATTR)
    1799                 :          0 : EXT4_FEATURE_COMPAT_FUNCS(resize_inode,         RESIZE_INODE)
    1800                 :          3 : EXT4_FEATURE_COMPAT_FUNCS(dir_index,            DIR_INDEX)
    1801                 :          3 : EXT4_FEATURE_COMPAT_FUNCS(sparse_super2,        SPARSE_SUPER2)
    1802                 :            : 
    1803                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super,      SPARSE_SUPER)
    1804                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(large_file,        LARGE_FILE)
    1805                 :            : EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir,         BTREE_DIR)
    1806                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file,         HUGE_FILE)
    1807                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum,          GDT_CSUM)
    1808                 :          0 : EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink,         DIR_NLINK)
    1809                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize,       EXTRA_ISIZE)
    1810                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(quota,             QUOTA)
    1811                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc,          BIGALLOC)
    1812                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum,     METADATA_CSUM)
    1813                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(readonly,          READONLY)
    1814                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(project,           PROJECT)
    1815                 :          3 : EXT4_FEATURE_RO_COMPAT_FUNCS(verity,            VERITY)
    1816                 :            : 
    1817                 :            : EXT4_FEATURE_INCOMPAT_FUNCS(compression,        COMPRESSION)
    1818                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(filetype,           FILETYPE)
    1819                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery,     RECOVER)
    1820                 :            : EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev,        JOURNAL_DEV)
    1821                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg,            META_BG)
    1822                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(extents,            EXTENTS)
    1823                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(64bit,              64BIT)
    1824                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(mmp,                MMP)
    1825                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,            FLEX_BG)
    1826                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,           EA_INODE)
    1827                 :            : EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,            DIRDATA)
    1828                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,          CSUM_SEED)
    1829                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(largedir,           LARGEDIR)
    1830                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,        INLINE_DATA)
    1831                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,            ENCRYPT)
    1832                 :          3 : EXT4_FEATURE_INCOMPAT_FUNCS(casefold,           CASEFOLD)
    1833                 :            : 
    1834                 :            : #define EXT2_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
    1835                 :            : #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
    1836                 :            :                                          EXT4_FEATURE_INCOMPAT_META_BG)
    1837                 :            : #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
    1838                 :            :                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
    1839                 :            :                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
    1840                 :            : 
    1841                 :            : #define EXT3_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
    1842                 :            : #define EXT3_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
    1843                 :            :                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
    1844                 :            :                                          EXT4_FEATURE_INCOMPAT_META_BG)
    1845                 :            : #define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
    1846                 :            :                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
    1847                 :            :                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
    1848                 :            : 
    1849                 :            : #define EXT4_FEATURE_COMPAT_SUPP        EXT4_FEATURE_COMPAT_EXT_ATTR
    1850                 :            : #define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \
    1851                 :            :                                          EXT4_FEATURE_INCOMPAT_RECOVER| \
    1852                 :            :                                          EXT4_FEATURE_INCOMPAT_META_BG| \
    1853                 :            :                                          EXT4_FEATURE_INCOMPAT_EXTENTS| \
    1854                 :            :                                          EXT4_FEATURE_INCOMPAT_64BIT| \
    1855                 :            :                                          EXT4_FEATURE_INCOMPAT_FLEX_BG| \
    1856                 :            :                                          EXT4_FEATURE_INCOMPAT_EA_INODE| \
    1857                 :            :                                          EXT4_FEATURE_INCOMPAT_MMP | \
    1858                 :            :                                          EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
    1859                 :            :                                          EXT4_FEATURE_INCOMPAT_ENCRYPT | \
    1860                 :            :                                          EXT4_FEATURE_INCOMPAT_CASEFOLD | \
    1861                 :            :                                          EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
    1862                 :            :                                          EXT4_FEATURE_INCOMPAT_LARGEDIR)
    1863                 :            : #define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
    1864                 :            :                                          EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
    1865                 :            :                                          EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
    1866                 :            :                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
    1867                 :            :                                          EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
    1868                 :            :                                          EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
    1869                 :            :                                          EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
    1870                 :            :                                          EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
    1871                 :            :                                          EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
    1872                 :            :                                          EXT4_FEATURE_RO_COMPAT_QUOTA |\
    1873                 :            :                                          EXT4_FEATURE_RO_COMPAT_PROJECT |\
    1874                 :            :                                          EXT4_FEATURE_RO_COMPAT_VERITY)
    1875                 :            : 
    1876                 :            : #define EXTN_FEATURE_FUNCS(ver) \
    1877                 :            : static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
    1878                 :            : { \
    1879                 :            :         return ((EXT4_SB(sb)->s_es->s_feature_compat & \
    1880                 :            :                 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
    1881                 :            : } \
    1882                 :            : static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
    1883                 :            : { \
    1884                 :            :         return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
    1885                 :            :                 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
    1886                 :            : } \
    1887                 :            : static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
    1888                 :            : { \
    1889                 :            :         return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
    1890                 :            :                 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
    1891                 :            : }
    1892                 :            : 
    1893                 :          1 : EXTN_FEATURE_FUNCS(2)
    1894                 :          1 : EXTN_FEATURE_FUNCS(3)
    1895                 :          3 : EXTN_FEATURE_FUNCS(4)
    1896                 :            : 
    1897                 :            : static inline bool ext4_has_compat_features(struct super_block *sb)
    1898                 :            : {
    1899                 :          0 :         return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
    1900                 :            : }
    1901                 :            : static inline bool ext4_has_ro_compat_features(struct super_block *sb)
    1902                 :            : {
    1903                 :          0 :         return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
    1904                 :            : }
    1905                 :            : static inline bool ext4_has_incompat_features(struct super_block *sb)
    1906                 :            : {
    1907                 :          0 :         return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
    1908                 :            : }
    1909                 :            : 
    1910                 :            : /*
    1911                 :            :  * Superblock flags
    1912                 :            :  */
    1913                 :            : #define EXT4_FLAGS_RESIZING     0
    1914                 :            : #define EXT4_FLAGS_SHUTDOWN     1
    1915                 :            : 
    1916                 :            : static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
    1917                 :            : {
    1918                 :            :         return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
    1919                 :            : }
    1920                 :            : 
    1921                 :            : 
    1922                 :            : /*
    1923                 :            :  * Default values for user and/or group using reserved blocks
    1924                 :            :  */
    1925                 :            : #define EXT4_DEF_RESUID         0
    1926                 :            : #define EXT4_DEF_RESGID         0
    1927                 :            : 
    1928                 :            : /*
    1929                 :            :  * Default project ID
    1930                 :            :  */
    1931                 :            : #define EXT4_DEF_PROJID         0
    1932                 :            : 
    1933                 :            : #define EXT4_DEF_INODE_READAHEAD_BLKS   32
    1934                 :            : 
    1935                 :            : /*
    1936                 :            :  * Default mount options
    1937                 :            :  */
    1938                 :            : #define EXT4_DEFM_DEBUG         0x0001
    1939                 :            : #define EXT4_DEFM_BSDGROUPS     0x0002
    1940                 :            : #define EXT4_DEFM_XATTR_USER    0x0004
    1941                 :            : #define EXT4_DEFM_ACL           0x0008
    1942                 :            : #define EXT4_DEFM_UID16         0x0010
    1943                 :            : #define EXT4_DEFM_JMODE         0x0060
    1944                 :            : #define EXT4_DEFM_JMODE_DATA    0x0020
    1945                 :            : #define EXT4_DEFM_JMODE_ORDERED 0x0040
    1946                 :            : #define EXT4_DEFM_JMODE_WBACK   0x0060
    1947                 :            : #define EXT4_DEFM_NOBARRIER     0x0100
    1948                 :            : #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
    1949                 :            : #define EXT4_DEFM_DISCARD       0x0400
    1950                 :            : #define EXT4_DEFM_NODELALLOC    0x0800
    1951                 :            : 
    1952                 :            : /*
    1953                 :            :  * Default journal batch times
    1954                 :            :  */
    1955                 :            : #define EXT4_DEF_MIN_BATCH_TIME 0
    1956                 :            : #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
    1957                 :            : 
    1958                 :            : /*
    1959                 :            :  * Minimum number of groups in a flexgroup before we separate out
    1960                 :            :  * directories into the first block group of a flexgroup
    1961                 :            :  */
    1962                 :            : #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
    1963                 :            : 
    1964                 :            : /*
    1965                 :            :  * Structure of a directory entry
    1966                 :            :  */
    1967                 :            : #define EXT4_NAME_LEN 255
    1968                 :            : 
    1969                 :            : struct ext4_dir_entry {
    1970                 :            :         __le32  inode;                  /* Inode number */
    1971                 :            :         __le16  rec_len;                /* Directory entry length */
    1972                 :            :         __le16  name_len;               /* Name length */
    1973                 :            :         char    name[EXT4_NAME_LEN];    /* File name */
    1974                 :            : };
    1975                 :            : 
    1976                 :            : /*
    1977                 :            :  * The new version of the directory entry.  Since EXT4 structures are
    1978                 :            :  * stored in intel byte order, and the name_len field could never be
    1979                 :            :  * bigger than 255 chars, it's safe to reclaim the extra byte for the
    1980                 :            :  * file_type field.
    1981                 :            :  */
    1982                 :            : struct ext4_dir_entry_2 {
    1983                 :            :         __le32  inode;                  /* Inode number */
    1984                 :            :         __le16  rec_len;                /* Directory entry length */
    1985                 :            :         __u8    name_len;               /* Name length */
    1986                 :            :         __u8    file_type;
    1987                 :            :         char    name[EXT4_NAME_LEN];    /* File name */
    1988                 :            : };
    1989                 :            : 
    1990                 :            : /*
    1991                 :            :  * This is a bogus directory entry at the end of each leaf block that
    1992                 :            :  * records checksums.
    1993                 :            :  */
    1994                 :            : struct ext4_dir_entry_tail {
    1995                 :            :         __le32  det_reserved_zero1;     /* Pretend to be unused */
    1996                 :            :         __le16  det_rec_len;            /* 12 */
    1997                 :            :         __u8    det_reserved_zero2;     /* Zero name length */
    1998                 :            :         __u8    det_reserved_ft;        /* 0xDE, fake file type */
    1999                 :            :         __le32  det_checksum;           /* crc32c(uuid+inum+dirblock) */
    2000                 :            : };
    2001                 :            : 
    2002                 :            : #define EXT4_DIRENT_TAIL(block, blocksize) \
    2003                 :            :         ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
    2004                 :            :                                         ((blocksize) - \
    2005                 :            :                                          sizeof(struct ext4_dir_entry_tail))))
    2006                 :            : 
    2007                 :            : /*
    2008                 :            :  * Ext4 directory file types.  Only the low 3 bits are used.  The
    2009                 :            :  * other bits are reserved for now.
    2010                 :            :  */
    2011                 :            : #define EXT4_FT_UNKNOWN         0
    2012                 :            : #define EXT4_FT_REG_FILE        1
    2013                 :            : #define EXT4_FT_DIR             2
    2014                 :            : #define EXT4_FT_CHRDEV          3
    2015                 :            : #define EXT4_FT_BLKDEV          4
    2016                 :            : #define EXT4_FT_FIFO            5
    2017                 :            : #define EXT4_FT_SOCK            6
    2018                 :            : #define EXT4_FT_SYMLINK         7
    2019                 :            : 
    2020                 :            : #define EXT4_FT_MAX             8
    2021                 :            : 
    2022                 :            : #define EXT4_FT_DIR_CSUM        0xDE
    2023                 :            : 
    2024                 :            : /*
    2025                 :            :  * EXT4_DIR_PAD defines the directory entries boundaries
    2026                 :            :  *
    2027                 :            :  * NOTE: It must be a multiple of 4
    2028                 :            :  */
    2029                 :            : #define EXT4_DIR_PAD                    4
    2030                 :            : #define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)
    2031                 :            : #define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \
    2032                 :            :                                          ~EXT4_DIR_ROUND)
    2033                 :            : #define EXT4_MAX_REC_LEN                ((1<<16)-1)
    2034                 :            : 
    2035                 :            : /*
    2036                 :            :  * If we ever get support for fs block sizes > page_size, we'll need
    2037                 :            :  * to remove the #if statements in the next two functions...
    2038                 :            :  */
    2039                 :            : static inline unsigned int
    2040                 :            : ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
    2041                 :            : {
    2042                 :          3 :         unsigned len = le16_to_cpu(dlen);
    2043                 :            : 
    2044                 :            : #if (PAGE_SIZE >= 65536)
    2045                 :            :         if (len == EXT4_MAX_REC_LEN || len == 0)
    2046                 :            :                 return blocksize;
    2047                 :            :         return (len & 65532) | ((len & 3) << 16);
    2048                 :            : #else
    2049                 :            :         return len;
    2050                 :            : #endif
    2051                 :            : }
    2052                 :            : 
    2053                 :          3 : static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
    2054                 :            : {
    2055                 :          3 :         if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
    2056                 :          0 :                 BUG();
    2057                 :            : #if (PAGE_SIZE >= 65536)
    2058                 :            :         if (len < 65536)
    2059                 :            :                 return cpu_to_le16(len);
    2060                 :            :         if (len == blocksize) {
    2061                 :            :                 if (blocksize == 65536)
    2062                 :            :                         return cpu_to_le16(EXT4_MAX_REC_LEN);
    2063                 :            :                 else
    2064                 :            :                         return cpu_to_le16(0);
    2065                 :            :         }
    2066                 :            :         return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
    2067                 :            : #else
    2068                 :          3 :         return cpu_to_le16(len);
    2069                 :            : #endif
    2070                 :            : }
    2071                 :            : 
    2072                 :            : /*
    2073                 :            :  * Hash Tree Directory indexing
    2074                 :            :  * (c) Daniel Phillips, 2001
    2075                 :            :  */
    2076                 :            : 
    2077                 :            : #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
    2078                 :            :                     ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
    2079                 :            : #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
    2080                 :            :                     !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
    2081                 :            : #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
    2082                 :            : 
    2083                 :            : /* Legal values for the dx_root hash_version field: */
    2084                 :            : 
    2085                 :            : #define DX_HASH_LEGACY                  0
    2086                 :            : #define DX_HASH_HALF_MD4                1
    2087                 :            : #define DX_HASH_TEA                     2
    2088                 :            : #define DX_HASH_LEGACY_UNSIGNED         3
    2089                 :            : #define DX_HASH_HALF_MD4_UNSIGNED       4
    2090                 :            : #define DX_HASH_TEA_UNSIGNED            5
    2091                 :            : 
    2092                 :          0 : static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
    2093                 :            :                               const void *address, unsigned int length)
    2094                 :            : {
    2095                 :            :         struct {
    2096                 :            :                 struct shash_desc shash;
    2097                 :            :                 char ctx[4];
    2098                 :            :         } desc;
    2099                 :            : 
    2100                 :          0 :         BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
    2101                 :            : 
    2102                 :          0 :         desc.shash.tfm = sbi->s_chksum_driver;
    2103                 :          0 :         *(u32 *)desc.ctx = crc;
    2104                 :            : 
    2105                 :          0 :         BUG_ON(crypto_shash_update(&desc.shash, address, length));
    2106                 :            : 
    2107                 :          0 :         return *(u32 *)desc.ctx;
    2108                 :            : }
    2109                 :            : 
    2110                 :            : #ifdef __KERNEL__
    2111                 :            : 
    2112                 :            : /* hash info structure used by the directory hash */
    2113                 :            : struct dx_hash_info
    2114                 :            : {
    2115                 :            :         u32             hash;
    2116                 :            :         u32             minor_hash;
    2117                 :            :         int             hash_version;
    2118                 :            :         u32             *seed;
    2119                 :            : };
    2120                 :            : 
    2121                 :            : 
    2122                 :            : /* 32 and 64 bit signed EOF for dx directories */
    2123                 :            : #define EXT4_HTREE_EOF_32BIT   ((1UL  << (32 - 1)) - 1)
    2124                 :            : #define EXT4_HTREE_EOF_64BIT   ((1ULL << (64 - 1)) - 1)
    2125                 :            : 
    2126                 :            : 
    2127                 :            : /*
    2128                 :            :  * Control parameters used by ext4_htree_next_block
    2129                 :            :  */
    2130                 :            : #define HASH_NB_ALWAYS          1
    2131                 :            : 
    2132                 :            : struct ext4_filename {
    2133                 :            :         const struct qstr *usr_fname;
    2134                 :            :         struct fscrypt_str disk_name;
    2135                 :            :         struct dx_hash_info hinfo;
    2136                 :            : #ifdef CONFIG_FS_ENCRYPTION
    2137                 :            :         struct fscrypt_str crypto_buf;
    2138                 :            : #endif
    2139                 :            : #ifdef CONFIG_UNICODE
    2140                 :            :         struct fscrypt_str cf_name;
    2141                 :            : #endif
    2142                 :            : };
    2143                 :            : 
    2144                 :            : #define fname_name(p) ((p)->disk_name.name)
    2145                 :            : #define fname_len(p)  ((p)->disk_name.len)
    2146                 :            : 
    2147                 :            : /*
    2148                 :            :  * Describe an inode's exact location on disk and in memory
    2149                 :            :  */
    2150                 :            : struct ext4_iloc
    2151                 :            : {
    2152                 :            :         struct buffer_head *bh;
    2153                 :            :         unsigned long offset;
    2154                 :            :         ext4_group_t block_group;
    2155                 :            : };
    2156                 :            : 
    2157                 :            : static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
    2158                 :            : {
    2159                 :          3 :         return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
    2160                 :            : }
    2161                 :            : 
    2162                 :            : static inline bool ext4_is_quota_file(struct inode *inode)
    2163                 :            : {
    2164                 :          3 :         return IS_NOQUOTA(inode) &&
    2165                 :          0 :                !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
    2166                 :            : }
    2167                 :            : 
    2168                 :            : /*
    2169                 :            :  * This structure is stuffed into the struct file's private_data field
    2170                 :            :  * for directories.  It is where we put information so that we can do
    2171                 :            :  * readdir operations in hash tree order.
    2172                 :            :  */
    2173                 :            : struct dir_private_info {
    2174                 :            :         struct rb_root  root;
    2175                 :            :         struct rb_node  *curr_node;
    2176                 :            :         struct fname    *extra_fname;
    2177                 :            :         loff_t          last_pos;
    2178                 :            :         __u32           curr_hash;
    2179                 :            :         __u32           curr_minor_hash;
    2180                 :            :         __u32           next_hash;
    2181                 :            : };
    2182                 :            : 
    2183                 :            : /* calculate the first block number of the group */
    2184                 :            : static inline ext4_fsblk_t
    2185                 :            : ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
    2186                 :            : {
    2187                 :          3 :         return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
    2188                 :          3 :                 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
    2189                 :            : }
    2190                 :            : 
    2191                 :            : /*
    2192                 :            :  * Special error return code only used by dx_probe() and its callers.
    2193                 :            :  */
    2194                 :            : #define ERR_BAD_DX_DIR  (-(MAX_ERRNO - 1))
    2195                 :            : 
    2196                 :            : /* htree levels for ext4 */
    2197                 :            : #define EXT4_HTREE_LEVEL_COMPAT 2
    2198                 :            : #define EXT4_HTREE_LEVEL        3
    2199                 :            : 
    2200                 :            : static inline int ext4_dir_htree_level(struct super_block *sb)
    2201                 :            : {
    2202                 :            :         return ext4_has_feature_largedir(sb) ?
    2203                 :          3 :                 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
    2204                 :            : }
    2205                 :            : 
    2206                 :            : /*
    2207                 :            :  * Timeout and state flag for lazy initialization inode thread.
    2208                 :            :  */
    2209                 :            : #define EXT4_DEF_LI_WAIT_MULT                   10
    2210                 :            : #define EXT4_DEF_LI_MAX_START_DELAY             5
    2211                 :            : #define EXT4_LAZYINIT_QUIT                      0x0001
    2212                 :            : #define EXT4_LAZYINIT_RUNNING                   0x0002
    2213                 :            : 
    2214                 :            : /*
    2215                 :            :  * Lazy inode table initialization info
    2216                 :            :  */
    2217                 :            : struct ext4_lazy_init {
    2218                 :            :         unsigned long           li_state;
    2219                 :            :         struct list_head        li_request_list;
    2220                 :            :         struct mutex            li_list_mtx;
    2221                 :            : };
    2222                 :            : 
    2223                 :            : struct ext4_li_request {
    2224                 :            :         struct super_block      *lr_super;
    2225                 :            :         struct ext4_sb_info     *lr_sbi;
    2226                 :            :         ext4_group_t            lr_next_group;
    2227                 :            :         struct list_head        lr_request;
    2228                 :            :         unsigned long           lr_next_sched;
    2229                 :            :         unsigned long           lr_timeout;
    2230                 :            : };
    2231                 :            : 
    2232                 :            : struct ext4_features {
    2233                 :            :         struct kobject f_kobj;
    2234                 :            :         struct completion f_kobj_unregister;
    2235                 :            : };
    2236                 :            : 
    2237                 :            : /*
    2238                 :            :  * This structure will be used for multiple mount protection. It will be
    2239                 :            :  * written into the block number saved in the s_mmp_block field in the
    2240                 :            :  * superblock. Programs that check MMP should assume that if
    2241                 :            :  * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
    2242                 :            :  * to use the filesystem, regardless of how old the timestamp is.
    2243                 :            :  */
    2244                 :            : #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
    2245                 :            : #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
    2246                 :            : #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
    2247                 :            : #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
    2248                 :            : 
    2249                 :            : struct mmp_struct {
    2250                 :            :         __le32  mmp_magic;              /* Magic number for MMP */
    2251                 :            :         __le32  mmp_seq;                /* Sequence no. updated periodically */
    2252                 :            : 
    2253                 :            :         /*
    2254                 :            :          * mmp_time, mmp_nodename & mmp_bdevname are only used for information
    2255                 :            :          * purposes and do not affect the correctness of the algorithm
    2256                 :            :          */
    2257                 :            :         __le64  mmp_time;               /* Time last updated */
    2258                 :            :         char    mmp_nodename[64];       /* Node which last updated MMP block */
    2259                 :            :         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
    2260                 :            : 
    2261                 :            :         /*
    2262                 :            :          * mmp_check_interval is used to verify if the MMP block has been
    2263                 :            :          * updated on the block device. The value is updated based on the
    2264                 :            :          * maximum time to write the MMP block during an update cycle.
    2265                 :            :          */
    2266                 :            :         __le16  mmp_check_interval;
    2267                 :            : 
    2268                 :            :         __le16  mmp_pad1;
    2269                 :            :         __le32  mmp_pad2[226];
    2270                 :            :         __le32  mmp_checksum;           /* crc32c(uuid+mmp_block) */
    2271                 :            : };
    2272                 :            : 
    2273                 :            : /* arguments passed to the mmp thread */
    2274                 :            : struct mmpd_data {
    2275                 :            :         struct buffer_head *bh; /* bh from initial read_mmp_block() */
    2276                 :            :         struct super_block *sb;  /* super block of the fs */
    2277                 :            : };
    2278                 :            : 
    2279                 :            : /*
    2280                 :            :  * Check interval multiplier
    2281                 :            :  * The MMP block is written every update interval and initially checked every
    2282                 :            :  * update interval x the multiplier (the value is then adapted based on the
    2283                 :            :  * write latency). The reason is that writes can be delayed under load and we
    2284                 :            :  * don't want readers to incorrectly assume that the filesystem is no longer
    2285                 :            :  * in use.
    2286                 :            :  */
    2287                 :            : #define EXT4_MMP_CHECK_MULT             2UL
    2288                 :            : 
    2289                 :            : /*
    2290                 :            :  * Minimum interval for MMP checking in seconds.
    2291                 :            :  */
    2292                 :            : #define EXT4_MMP_MIN_CHECK_INTERVAL     5UL
    2293                 :            : 
    2294                 :            : /*
    2295                 :            :  * Maximum interval for MMP checking in seconds.
    2296                 :            :  */
    2297                 :            : #define EXT4_MMP_MAX_CHECK_INTERVAL     300UL
    2298                 :            : 
    2299                 :            : /*
    2300                 :            :  * Function prototypes
    2301                 :            :  */
    2302                 :            : 
    2303                 :            : /*
    2304                 :            :  * Ok, these declarations are also in <linux/kernel.h> but none of the
    2305                 :            :  * ext4 source programs needs to include it so they are duplicated here.
    2306                 :            :  */
    2307                 :            : # define NORET_TYPE     /**/
    2308                 :            : # define ATTRIB_NORET   __attribute__((noreturn))
    2309                 :            : # define NORET_AND      noreturn,
    2310                 :            : 
    2311                 :            : /* bitmap.c */
    2312                 :            : extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
    2313                 :            : void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
    2314                 :            :                                 struct ext4_group_desc *gdp,
    2315                 :            :                                 struct buffer_head *bh, int sz);
    2316                 :            : int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
    2317                 :            :                                   struct ext4_group_desc *gdp,
    2318                 :            :                                   struct buffer_head *bh, int sz);
    2319                 :            : void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
    2320                 :            :                                 struct ext4_group_desc *gdp,
    2321                 :            :                                 struct buffer_head *bh);
    2322                 :            : int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
    2323                 :            :                                   struct ext4_group_desc *gdp,
    2324                 :            :                                   struct buffer_head *bh);
    2325                 :            : 
    2326                 :            : /* balloc.c */
    2327                 :            : extern void ext4_get_group_no_and_offset(struct super_block *sb,
    2328                 :            :                                          ext4_fsblk_t blocknr,
    2329                 :            :                                          ext4_group_t *blockgrpp,
    2330                 :            :                                          ext4_grpblk_t *offsetp);
    2331                 :            : extern ext4_group_t ext4_get_group_number(struct super_block *sb,
    2332                 :            :                                           ext4_fsblk_t block);
    2333                 :            : 
    2334                 :            : extern unsigned int ext4_block_group(struct super_block *sb,
    2335                 :            :                         ext4_fsblk_t blocknr);
    2336                 :            : extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
    2337                 :            :                         ext4_fsblk_t blocknr);
    2338                 :            : extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
    2339                 :            : extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
    2340                 :            :                         ext4_group_t group);
    2341                 :            : extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
    2342                 :            :                                          ext4_fsblk_t goal,
    2343                 :            :                                          unsigned int flags,
    2344                 :            :                                          unsigned long *count,
    2345                 :            :                                          int *errp);
    2346                 :            : extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
    2347                 :            :                                     s64 nclusters, unsigned int flags);
    2348                 :            : extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
    2349                 :            : extern void ext4_check_blocks_bitmap(struct super_block *);
    2350                 :            : extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
    2351                 :            :                                                     ext4_group_t block_group,
    2352                 :            :                                                     struct buffer_head ** bh);
    2353                 :            : extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
    2354                 :            : 
    2355                 :            : extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
    2356                 :            :                                                 ext4_group_t block_group);
    2357                 :            : extern int ext4_wait_block_bitmap(struct super_block *sb,
    2358                 :            :                                   ext4_group_t block_group,
    2359                 :            :                                   struct buffer_head *bh);
    2360                 :            : extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
    2361                 :            :                                                   ext4_group_t block_group);
    2362                 :            : extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
    2363                 :            :                                               ext4_group_t block_group,
    2364                 :            :                                               struct ext4_group_desc *gdp);
    2365                 :            : ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
    2366                 :            : 
    2367                 :            : #ifdef CONFIG_UNICODE
    2368                 :            : extern void ext4_fname_setup_ci_filename(struct inode *dir,
    2369                 :            :                                          const struct qstr *iname,
    2370                 :            :                                          struct fscrypt_str *fname);
    2371                 :            : #endif
    2372                 :            : 
    2373                 :            : #ifdef CONFIG_FS_ENCRYPTION
    2374                 :          3 : static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
    2375                 :            :                                                 const struct fscrypt_name *src)
    2376                 :            : {
    2377                 :          3 :         memset(dst, 0, sizeof(*dst));
    2378                 :            : 
    2379                 :          3 :         dst->usr_fname = src->usr_fname;
    2380                 :          3 :         dst->disk_name = src->disk_name;
    2381                 :          3 :         dst->hinfo.hash = src->hash;
    2382                 :          3 :         dst->hinfo.minor_hash = src->minor_hash;
    2383                 :          3 :         dst->crypto_buf = src->crypto_buf;
    2384                 :          3 : }
    2385                 :            : 
    2386                 :          3 : static inline int ext4_fname_setup_filename(struct inode *dir,
    2387                 :            :                                             const struct qstr *iname,
    2388                 :            :                                             int lookup,
    2389                 :            :                                             struct ext4_filename *fname)
    2390                 :            : {
    2391                 :            :         struct fscrypt_name name;
    2392                 :            :         int err;
    2393                 :            : 
    2394                 :          3 :         err = fscrypt_setup_filename(dir, iname, lookup, &name);
    2395                 :          3 :         if (err)
    2396                 :            :                 return err;
    2397                 :            : 
    2398                 :          3 :         ext4_fname_from_fscrypt_name(fname, &name);
    2399                 :            : 
    2400                 :            : #ifdef CONFIG_UNICODE
    2401                 :            :         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
    2402                 :            : #endif
    2403                 :          3 :         return 0;
    2404                 :            : }
    2405                 :            : 
    2406                 :          3 : static inline int ext4_fname_prepare_lookup(struct inode *dir,
    2407                 :            :                                             struct dentry *dentry,
    2408                 :            :                                             struct ext4_filename *fname)
    2409                 :            : {
    2410                 :            :         struct fscrypt_name name;
    2411                 :            :         int err;
    2412                 :            : 
    2413                 :          3 :         err = fscrypt_prepare_lookup(dir, dentry, &name);
    2414                 :          3 :         if (err)
    2415                 :            :                 return err;
    2416                 :            : 
    2417                 :          3 :         ext4_fname_from_fscrypt_name(fname, &name);
    2418                 :            : 
    2419                 :            : #ifdef CONFIG_UNICODE
    2420                 :            :         ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
    2421                 :            : #endif
    2422                 :          3 :         return 0;
    2423                 :            : }
    2424                 :            : 
    2425                 :            : static inline void ext4_fname_free_filename(struct ext4_filename *fname)
    2426                 :            : {
    2427                 :            :         struct fscrypt_name name;
    2428                 :            : 
    2429                 :          3 :         name.crypto_buf = fname->crypto_buf;
    2430                 :            :         fscrypt_free_filename(&name);
    2431                 :            : 
    2432                 :          3 :         fname->crypto_buf.name = NULL;
    2433                 :          3 :         fname->usr_fname = NULL;
    2434                 :          3 :         fname->disk_name.name = NULL;
    2435                 :            : 
    2436                 :            : #ifdef CONFIG_UNICODE
    2437                 :            :         kfree(fname->cf_name.name);
    2438                 :            :         fname->cf_name.name = NULL;
    2439                 :            : #endif
    2440                 :            : }
    2441                 :            : #else /* !CONFIG_FS_ENCRYPTION */
    2442                 :            : static inline int ext4_fname_setup_filename(struct inode *dir,
    2443                 :            :                                             const struct qstr *iname,
    2444                 :            :                                             int lookup,
    2445                 :            :                                             struct ext4_filename *fname)
    2446                 :            : {
    2447                 :            :         fname->usr_fname = iname;
    2448                 :            :         fname->disk_name.name = (unsigned char *) iname->name;
    2449                 :            :         fname->disk_name.len = iname->len;
    2450                 :            : 
    2451                 :            : #ifdef CONFIG_UNICODE
    2452                 :            :         ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
    2453                 :            : #endif
    2454                 :            : 
    2455                 :            :         return 0;
    2456                 :            : }
    2457                 :            : 
    2458                 :            : static inline int ext4_fname_prepare_lookup(struct inode *dir,
    2459                 :            :                                             struct dentry *dentry,
    2460                 :            :                                             struct ext4_filename *fname)
    2461                 :            : {
    2462                 :            :         return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
    2463                 :            : }
    2464                 :            : 
    2465                 :            : static inline void ext4_fname_free_filename(struct ext4_filename *fname)
    2466                 :            : {
    2467                 :            : #ifdef CONFIG_UNICODE
    2468                 :            :         kfree(fname->cf_name.name);
    2469                 :            :         fname->cf_name.name = NULL;
    2470                 :            : #endif
    2471                 :            : }
    2472                 :            : #endif /* !CONFIG_FS_ENCRYPTION */
    2473                 :            : 
    2474                 :            : /* dir.c */
    2475                 :            : extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
    2476                 :            :                                   struct file *,
    2477                 :            :                                   struct ext4_dir_entry_2 *,
    2478                 :            :                                   struct buffer_head *, char *, int,
    2479                 :            :                                   unsigned int);
    2480                 :            : #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset)      \
    2481                 :            :         unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
    2482                 :            :                                         (de), (bh), (buf), (size), (offset)))
    2483                 :            : extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
    2484                 :            :                                 __u32 minor_hash,
    2485                 :            :                                 struct ext4_dir_entry_2 *dirent,
    2486                 :            :                                 struct fscrypt_str *ent_name);
    2487                 :            : extern void ext4_htree_free_dir_info(struct dir_private_info *p);
    2488                 :            : extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
    2489                 :            :                              struct buffer_head *bh,
    2490                 :            :                              void *buf, int buf_size,
    2491                 :            :                              struct ext4_filename *fname,
    2492                 :            :                              struct ext4_dir_entry_2 **dest_de);
    2493                 :            : void ext4_insert_dentry(struct inode *inode,
    2494                 :            :                         struct ext4_dir_entry_2 *de,
    2495                 :            :                         int buf_size,
    2496                 :            :                         struct ext4_filename *fname);
    2497                 :          3 : static inline void ext4_update_dx_flag(struct inode *inode)
    2498                 :            : {
    2499                 :          3 :         if (!ext4_has_feature_dir_index(inode->i_sb)) {
    2500                 :            :                 /* ext4_iget() should have caught this... */
    2501                 :          0 :                 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
    2502                 :            :                 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
    2503                 :            :         }
    2504                 :          3 : }
    2505                 :            : static const unsigned char ext4_filetype_table[] = {
    2506                 :            :         DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
    2507                 :            : };
    2508                 :            : 
    2509                 :            : static inline  unsigned char get_dtype(struct super_block *sb, int filetype)
    2510                 :            : {
    2511                 :          3 :         if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
    2512                 :            :                 return DT_UNKNOWN;
    2513                 :            : 
    2514                 :          3 :         return ext4_filetype_table[filetype];
    2515                 :            : }
    2516                 :            : extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
    2517                 :            :                              void *buf, int buf_size);
    2518                 :            : 
    2519                 :            : /* fsync.c */
    2520                 :            : extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
    2521                 :            : 
    2522                 :            : /* hash.c */
    2523                 :            : extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
    2524                 :            :                           struct dx_hash_info *hinfo);
    2525                 :            : 
    2526                 :            : /* ialloc.c */
    2527                 :            : extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
    2528                 :            :                                       const struct qstr *qstr, __u32 goal,
    2529                 :            :                                       uid_t *owner, __u32 i_flags,
    2530                 :            :                                       int handle_type, unsigned int line_no,
    2531                 :            :                                       int nblocks);
    2532                 :            : 
    2533                 :            : #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
    2534                 :            :         __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
    2535                 :            :                          i_flags, 0, 0, 0)
    2536                 :            : #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
    2537                 :            :                                     type, nblocks)                  \
    2538                 :            :         __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
    2539                 :            :                          0, (type), __LINE__, (nblocks))
    2540                 :            : 
    2541                 :            : 
    2542                 :            : extern void ext4_free_inode(handle_t *, struct inode *);
    2543                 :            : extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
    2544                 :            : extern unsigned long ext4_count_free_inodes(struct super_block *);
    2545                 :            : extern unsigned long ext4_count_dirs(struct super_block *);
    2546                 :            : extern void ext4_check_inodes_bitmap(struct super_block *);
    2547                 :            : extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
    2548                 :            : extern int ext4_init_inode_table(struct super_block *sb,
    2549                 :            :                                  ext4_group_t group, int barrier);
    2550                 :            : extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
    2551                 :            : 
    2552                 :            : /* mballoc.c */
    2553                 :            : extern const struct seq_operations ext4_mb_seq_groups_ops;
    2554                 :            : extern long ext4_mb_stats;
    2555                 :            : extern long ext4_mb_max_to_scan;
    2556                 :            : extern int ext4_mb_init(struct super_block *);
    2557                 :            : extern int ext4_mb_release(struct super_block *);
    2558                 :            : extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
    2559                 :            :                                 struct ext4_allocation_request *, int *);
    2560                 :            : extern int ext4_mb_reserve_blocks(struct super_block *, int);
    2561                 :            : extern void ext4_discard_preallocations(struct inode *);
    2562                 :            : extern int __init ext4_init_mballoc(void);
    2563                 :            : extern void ext4_exit_mballoc(void);
    2564                 :            : extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
    2565                 :            :                              struct buffer_head *bh, ext4_fsblk_t block,
    2566                 :            :                              unsigned long count, int flags);
    2567                 :            : extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
    2568                 :            :                                    ext4_group_t ngroups);
    2569                 :            : extern int ext4_mb_add_groupinfo(struct super_block *sb,
    2570                 :            :                 ext4_group_t i, struct ext4_group_desc *desc);
    2571                 :            : extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
    2572                 :            :                                 ext4_fsblk_t block, unsigned long count);
    2573                 :            : extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
    2574                 :            : extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
    2575                 :            : 
    2576                 :            : /* inode.c */
    2577                 :            : int ext4_inode_is_fast_symlink(struct inode *inode);
    2578                 :            : struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
    2579                 :            : struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
    2580                 :            : int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
    2581                 :            :                      bool wait, struct buffer_head **bhs);
    2582                 :            : int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
    2583                 :            :                              struct buffer_head *bh_result, int create);
    2584                 :            : int ext4_get_block(struct inode *inode, sector_t iblock,
    2585                 :            :                    struct buffer_head *bh_result, int create);
    2586                 :            : int ext4_dio_get_block(struct inode *inode, sector_t iblock,
    2587                 :            :                        struct buffer_head *bh_result, int create);
    2588                 :            : int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
    2589                 :            :                            struct buffer_head *bh, int create);
    2590                 :            : int ext4_walk_page_buffers(handle_t *handle,
    2591                 :            :                            struct buffer_head *head,
    2592                 :            :                            unsigned from,
    2593                 :            :                            unsigned to,
    2594                 :            :                            int *partial,
    2595                 :            :                            int (*fn)(handle_t *handle,
    2596                 :            :                                      struct buffer_head *bh));
    2597                 :            : int do_journal_get_write_access(handle_t *handle,
    2598                 :            :                                 struct buffer_head *bh);
    2599                 :            : #define FALL_BACK_TO_NONDELALLOC 1
    2600                 :            : #define CONVERT_INLINE_DATA      2
    2601                 :            : 
    2602                 :            : typedef enum {
    2603                 :            :         EXT4_IGET_NORMAL =      0,
    2604                 :            :         EXT4_IGET_SPECIAL =     0x0001, /* OK to iget a system inode */
    2605                 :            :         EXT4_IGET_HANDLE =      0x0002  /* Inode # is from a handle */
    2606                 :            : } ext4_iget_flags;
    2607                 :            : 
    2608                 :            : extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
    2609                 :            :                                  ext4_iget_flags flags, const char *function,
    2610                 :            :                                  unsigned int line);
    2611                 :            : 
    2612                 :            : #define ext4_iget(sb, ino, flags) \
    2613                 :            :         __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
    2614                 :            : 
    2615                 :            : extern int  ext4_write_inode(struct inode *, struct writeback_control *);
    2616                 :            : extern int  ext4_setattr(struct dentry *, struct iattr *);
    2617                 :            : extern int  ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
    2618                 :            : extern void ext4_evict_inode(struct inode *);
    2619                 :            : extern void ext4_clear_inode(struct inode *);
    2620                 :            : extern int  ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
    2621                 :            : extern int  ext4_sync_inode(handle_t *, struct inode *);
    2622                 :            : extern void ext4_dirty_inode(struct inode *, int);
    2623                 :            : extern int ext4_change_inode_journal_flag(struct inode *, int);
    2624                 :            : extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
    2625                 :            : extern int ext4_inode_attach_jinode(struct inode *inode);
    2626                 :            : extern int ext4_can_truncate(struct inode *inode);
    2627                 :            : extern int ext4_truncate(struct inode *);
    2628                 :            : extern int ext4_break_layouts(struct inode *);
    2629                 :            : extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
    2630                 :            : extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
    2631                 :            : extern void ext4_set_inode_flags(struct inode *);
    2632                 :            : extern int ext4_alloc_da_blocks(struct inode *inode);
    2633                 :            : extern void ext4_set_aops(struct inode *inode);
    2634                 :            : extern int ext4_writepage_trans_blocks(struct inode *);
    2635                 :            : extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
    2636                 :            : extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
    2637                 :            :                              loff_t lstart, loff_t lend);
    2638                 :            : extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
    2639                 :            : extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
    2640                 :            : extern qsize_t *ext4_get_reserved_space(struct inode *inode);
    2641                 :            : extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
    2642                 :            : extern void ext4_da_release_space(struct inode *inode, int to_free);
    2643                 :            : extern void ext4_da_update_reserve_space(struct inode *inode,
    2644                 :            :                                         int used, int quota_claim);
    2645                 :            : extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
    2646                 :            :                               ext4_fsblk_t pblk, ext4_lblk_t len);
    2647                 :            : 
    2648                 :            : /* indirect.c */
    2649                 :            : extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
    2650                 :            :                                 struct ext4_map_blocks *map, int flags);
    2651                 :            : extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
    2652                 :            : extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
    2653                 :            : extern void ext4_ind_truncate(handle_t *, struct inode *inode);
    2654                 :            : extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
    2655                 :            :                                  ext4_lblk_t start, ext4_lblk_t end);
    2656                 :            : 
    2657                 :            : /* ioctl.c */
    2658                 :            : extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
    2659                 :            : extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
    2660                 :            : 
    2661                 :            : /* migrate.c */
    2662                 :            : extern int ext4_ext_migrate(struct inode *);
    2663                 :            : extern int ext4_ind_migrate(struct inode *inode);
    2664                 :            : 
    2665                 :            : /* namei.c */
    2666                 :            : extern int ext4_dirblock_csum_verify(struct inode *inode,
    2667                 :            :                                      struct buffer_head *bh);
    2668                 :            : extern int ext4_orphan_add(handle_t *, struct inode *);
    2669                 :            : extern int ext4_orphan_del(handle_t *, struct inode *);
    2670                 :            : extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
    2671                 :            :                                 __u32 start_minor_hash, __u32 *next_hash);
    2672                 :            : extern int ext4_search_dir(struct buffer_head *bh,
    2673                 :            :                            char *search_buf,
    2674                 :            :                            int buf_size,
    2675                 :            :                            struct inode *dir,
    2676                 :            :                            struct ext4_filename *fname,
    2677                 :            :                            unsigned int offset,
    2678                 :            :                            struct ext4_dir_entry_2 **res_dir);
    2679                 :            : extern int ext4_generic_delete_entry(handle_t *handle,
    2680                 :            :                                      struct inode *dir,
    2681                 :            :                                      struct ext4_dir_entry_2 *de_del,
    2682                 :            :                                      struct buffer_head *bh,
    2683                 :            :                                      void *entry_buf,
    2684                 :            :                                      int buf_size,
    2685                 :            :                                      int csum_size);
    2686                 :            : extern bool ext4_empty_dir(struct inode *inode);
    2687                 :            : 
    2688                 :            : /* resize.c */
    2689                 :            : extern void ext4_kvfree_array_rcu(void *to_free);
    2690                 :            : extern int ext4_group_add(struct super_block *sb,
    2691                 :            :                                 struct ext4_new_group_data *input);
    2692                 :            : extern int ext4_group_extend(struct super_block *sb,
    2693                 :            :                                 struct ext4_super_block *es,
    2694                 :            :                                 ext4_fsblk_t n_blocks_count);
    2695                 :            : extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
    2696                 :            : 
    2697                 :            : /* super.c */
    2698                 :            : extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
    2699                 :            :                                          sector_t block, int op_flags);
    2700                 :            : extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
    2701                 :            : extern int ext4_calculate_overhead(struct super_block *sb);
    2702                 :            : extern void ext4_superblock_csum_set(struct super_block *sb);
    2703                 :            : extern void *ext4_kvmalloc(size_t size, gfp_t flags);
    2704                 :            : extern void *ext4_kvzalloc(size_t size, gfp_t flags);
    2705                 :            : extern int ext4_alloc_flex_bg_array(struct super_block *sb,
    2706                 :            :                                     ext4_group_t ngroup);
    2707                 :            : extern const char *ext4_decode_error(struct super_block *sb, int errno,
    2708                 :            :                                      char nbuf[16]);
    2709                 :            : extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
    2710                 :            :                                              ext4_group_t block_group,
    2711                 :            :                                              unsigned int flags);
    2712                 :            : 
    2713                 :            : extern __printf(4, 5)
    2714                 :            : void __ext4_error(struct super_block *, const char *, unsigned int,
    2715                 :            :                   const char *, ...);
    2716                 :            : extern __printf(5, 6)
    2717                 :            : void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
    2718                 :            :                       const char *, ...);
    2719                 :            : extern __printf(5, 6)
    2720                 :            : void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
    2721                 :            :                      const char *, ...);
    2722                 :            : extern void __ext4_std_error(struct super_block *, const char *,
    2723                 :            :                              unsigned int, int);
    2724                 :            : extern __printf(4, 5)
    2725                 :            : void __ext4_abort(struct super_block *, const char *, unsigned int,
    2726                 :            :                   const char *, ...);
    2727                 :            : extern __printf(4, 5)
    2728                 :            : void __ext4_warning(struct super_block *, const char *, unsigned int,
    2729                 :            :                     const char *, ...);
    2730                 :            : extern __printf(4, 5)
    2731                 :            : void __ext4_warning_inode(const struct inode *inode, const char *function,
    2732                 :            :                           unsigned int line, const char *fmt, ...);
    2733                 :            : extern __printf(3, 4)
    2734                 :            : void __ext4_msg(struct super_block *, const char *, const char *, ...);
    2735                 :            : extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
    2736                 :            :                            const char *, unsigned int, const char *);
    2737                 :            : extern __printf(7, 8)
    2738                 :            : void __ext4_grp_locked_error(const char *, unsigned int,
    2739                 :            :                              struct super_block *, ext4_group_t,
    2740                 :            :                              unsigned long, ext4_fsblk_t,
    2741                 :            :                              const char *, ...);
    2742                 :            : 
    2743                 :            : #define EXT4_ERROR_INODE(inode, fmt, a...) \
    2744                 :            :         ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
    2745                 :            : 
    2746                 :            : #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...)                 \
    2747                 :            :         ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
    2748                 :            : 
    2749                 :            : #define EXT4_ERROR_FILE(file, block, fmt, a...)                         \
    2750                 :            :         ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
    2751                 :            : 
    2752                 :            : #ifdef CONFIG_PRINTK
    2753                 :            : 
    2754                 :            : #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
    2755                 :            :         __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
    2756                 :            : #define ext4_error_file(file, func, line, block, fmt, ...)              \
    2757                 :            :         __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
    2758                 :            : #define ext4_error(sb, fmt, ...)                                        \
    2759                 :            :         __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
    2760                 :            : #define ext4_abort(sb, fmt, ...)                                        \
    2761                 :            :         __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
    2762                 :            : #define ext4_warning(sb, fmt, ...)                                      \
    2763                 :            :         __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
    2764                 :            : #define ext4_warning_inode(inode, fmt, ...)                             \
    2765                 :            :         __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
    2766                 :            : #define ext4_msg(sb, level, fmt, ...)                           \
    2767                 :            :         __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
    2768                 :            : #define dump_mmp_msg(sb, mmp, msg)                                      \
    2769                 :            :         __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
    2770                 :            : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
    2771                 :            :         __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
    2772                 :            :                                 fmt, ##__VA_ARGS__)
    2773                 :            : 
    2774                 :            : #else
    2775                 :            : 
    2776                 :            : #define ext4_error_inode(inode, func, line, block, fmt, ...)            \
    2777                 :            : do {                                                                    \
    2778                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2779                 :            :         __ext4_error_inode(inode, "", 0, block, " ");                       \
    2780                 :            : } while (0)
    2781                 :            : #define ext4_error_file(file, func, line, block, fmt, ...)              \
    2782                 :            : do {                                                                    \
    2783                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2784                 :            :         __ext4_error_file(file, "", 0, block, " ");                 \
    2785                 :            : } while (0)
    2786                 :            : #define ext4_error(sb, fmt, ...)                                        \
    2787                 :            : do {                                                                    \
    2788                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2789                 :            :         __ext4_error(sb, "", 0, " ");                                       \
    2790                 :            : } while (0)
    2791                 :            : #define ext4_abort(sb, fmt, ...)                                        \
    2792                 :            : do {                                                                    \
    2793                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2794                 :            :         __ext4_abort(sb, "", 0, " ");                                       \
    2795                 :            : } while (0)
    2796                 :            : #define ext4_warning(sb, fmt, ...)                                      \
    2797                 :            : do {                                                                    \
    2798                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2799                 :            :         __ext4_warning(sb, "", 0, " ");                                     \
    2800                 :            : } while (0)
    2801                 :            : #define ext4_warning_inode(inode, fmt, ...)                             \
    2802                 :            : do {                                                                    \
    2803                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2804                 :            :         __ext4_warning_inode(inode, "", 0, " ");                    \
    2805                 :            : } while (0)
    2806                 :            : #define ext4_msg(sb, level, fmt, ...)                                   \
    2807                 :            : do {                                                                    \
    2808                 :            :         no_printk(fmt, ##__VA_ARGS__);                                  \
    2809                 :            :         __ext4_msg(sb, "", " ");                                    \
    2810                 :            : } while (0)
    2811                 :            : #define dump_mmp_msg(sb, mmp, msg)                                      \
    2812                 :            :         __dump_mmp_msg(sb, mmp, "", 0, "")
    2813                 :            : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...)            \
    2814                 :            : do {                                                                    \
    2815                 :            :         no_printk(fmt, ##__VA_ARGS__);                          \
    2816                 :            :         __ext4_grp_locked_error("", 0, sb, grp, ino, block, " ");   \
    2817                 :            : } while (0)
    2818                 :            : 
    2819                 :            : #endif
    2820                 :            : 
    2821                 :            : extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
    2822                 :            :                                         __u32 compat);
    2823                 :            : extern int ext4_update_rocompat_feature(handle_t *handle,
    2824                 :            :                                         struct super_block *sb, __u32 rocompat);
    2825                 :            : extern int ext4_update_incompat_feature(handle_t *handle,
    2826                 :            :                                         struct super_block *sb, __u32 incompat);
    2827                 :            : extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
    2828                 :            :                                       struct ext4_group_desc *bg);
    2829                 :            : extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
    2830                 :            :                                       struct ext4_group_desc *bg);
    2831                 :            : extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
    2832                 :            :                                      struct ext4_group_desc *bg);
    2833                 :            : extern __u32 ext4_free_group_clusters(struct super_block *sb,
    2834                 :            :                                       struct ext4_group_desc *bg);
    2835                 :            : extern __u32 ext4_free_inodes_count(struct super_block *sb,
    2836                 :            :                                  struct ext4_group_desc *bg);
    2837                 :            : extern __u32 ext4_used_dirs_count(struct super_block *sb,
    2838                 :            :                                 struct ext4_group_desc *bg);
    2839                 :            : extern __u32 ext4_itable_unused_count(struct super_block *sb,
    2840                 :            :                                    struct ext4_group_desc *bg);
    2841                 :            : extern void ext4_block_bitmap_set(struct super_block *sb,
    2842                 :            :                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
    2843                 :            : extern void ext4_inode_bitmap_set(struct super_block *sb,
    2844                 :            :                                   struct ext4_group_desc *bg, ext4_fsblk_t blk);
    2845                 :            : extern void ext4_inode_table_set(struct super_block *sb,
    2846                 :            :                                  struct ext4_group_desc *bg, ext4_fsblk_t blk);
    2847                 :            : extern void ext4_free_group_clusters_set(struct super_block *sb,
    2848                 :            :                                          struct ext4_group_desc *bg,
    2849                 :            :                                          __u32 count);
    2850                 :            : extern void ext4_free_inodes_set(struct super_block *sb,
    2851                 :            :                                 struct ext4_group_desc *bg, __u32 count);
    2852                 :            : extern void ext4_used_dirs_set(struct super_block *sb,
    2853                 :            :                                 struct ext4_group_desc *bg, __u32 count);
    2854                 :            : extern void ext4_itable_unused_set(struct super_block *sb,
    2855                 :            :                                    struct ext4_group_desc *bg, __u32 count);
    2856                 :            : extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
    2857                 :            :                                        struct ext4_group_desc *gdp);
    2858                 :            : extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
    2859                 :            :                                      struct ext4_group_desc *gdp);
    2860                 :            : extern int ext4_register_li_request(struct super_block *sb,
    2861                 :            :                                     ext4_group_t first_not_zeroed);
    2862                 :            : 
    2863                 :          3 : static inline int ext4_has_metadata_csum(struct super_block *sb)
    2864                 :            : {
    2865                 :          3 :         WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
    2866                 :            :                      !EXT4_SB(sb)->s_chksum_driver);
    2867                 :            : 
    2868                 :          3 :         return ext4_has_feature_metadata_csum(sb) &&
    2869                 :          0 :                (EXT4_SB(sb)->s_chksum_driver != NULL);
    2870                 :            : }
    2871                 :            : 
    2872                 :          3 : static inline int ext4_has_group_desc_csum(struct super_block *sb)
    2873                 :            : {
    2874                 :          3 :         return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
    2875                 :            : }
    2876                 :            : 
    2877                 :            : static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
    2878                 :            : {
    2879                 :          3 :         return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
    2880                 :          3 :                 le32_to_cpu(es->s_blocks_count_lo);
    2881                 :            : }
    2882                 :            : 
    2883                 :            : static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
    2884                 :            : {
    2885                 :          3 :         return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
    2886                 :          3 :                 le32_to_cpu(es->s_r_blocks_count_lo);
    2887                 :            : }
    2888                 :            : 
    2889                 :            : static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
    2890                 :            : {
    2891                 :          0 :         return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
    2892                 :          0 :                 le32_to_cpu(es->s_free_blocks_count_lo);
    2893                 :            : }
    2894                 :            : 
    2895                 :            : static inline void ext4_blocks_count_set(struct ext4_super_block *es,
    2896                 :            :                                          ext4_fsblk_t blk)
    2897                 :            : {
    2898                 :          0 :         es->s_blocks_count_lo = cpu_to_le32((u32)blk);
    2899                 :          0 :         es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
    2900                 :            : }
    2901                 :            : 
    2902                 :            : static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
    2903                 :            :                                               ext4_fsblk_t blk)
    2904                 :            : {
    2905                 :          3 :         es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
    2906                 :          3 :         es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
    2907                 :            : }
    2908                 :            : 
    2909                 :            : static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
    2910                 :            :                                            ext4_fsblk_t blk)
    2911                 :            : {
    2912                 :          0 :         es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
    2913                 :          0 :         es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
    2914                 :            : }
    2915                 :            : 
    2916                 :            : static inline loff_t ext4_isize(struct super_block *sb,
    2917                 :            :                                 struct ext4_inode *raw_inode)
    2918                 :            : {
    2919                 :          3 :         if (ext4_has_feature_largedir(sb) ||
    2920                 :          3 :             S_ISREG(le16_to_cpu(raw_inode->i_mode)))
    2921                 :          3 :                 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
    2922                 :          3 :                         le32_to_cpu(raw_inode->i_size_lo);
    2923                 :            : 
    2924                 :          3 :         return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
    2925                 :            : }
    2926                 :            : 
    2927                 :            : static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
    2928                 :            : {
    2929                 :          3 :         raw_inode->i_size_lo = cpu_to_le32(i_size);
    2930                 :          3 :         raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
    2931                 :            : }
    2932                 :            : 
    2933                 :            : static inline
    2934                 :          3 : struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
    2935                 :            :                                             ext4_group_t group)
    2936                 :            : {
    2937                 :            :          struct ext4_group_info **grp_info;
    2938                 :            :          long indexv, indexh;
    2939                 :          3 :          BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
    2940                 :          3 :          indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
    2941                 :          3 :          indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
    2942                 :          3 :          grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
    2943                 :          3 :          return grp_info[indexh];
    2944                 :            : }
    2945                 :            : 
    2946                 :            : /*
    2947                 :            :  * Reading s_groups_count requires using smp_rmb() afterwards.  See
    2948                 :            :  * the locking protocol documented in the comments of ext4_group_add()
    2949                 :            :  * in resize.c
    2950                 :            :  */
    2951                 :            : static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
    2952                 :            : {
    2953                 :          3 :         ext4_group_t    ngroups = EXT4_SB(sb)->s_groups_count;
    2954                 :            : 
    2955                 :          3 :         smp_rmb();
    2956                 :            :         return ngroups;
    2957                 :            : }
    2958                 :            : 
    2959                 :            : static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
    2960                 :            :                                              ext4_group_t block_group)
    2961                 :            : {
    2962                 :          3 :         return block_group >> sbi->s_log_groups_per_flex;
    2963                 :            : }
    2964                 :            : 
    2965                 :            : static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
    2966                 :            : {
    2967                 :          3 :         return 1 << sbi->s_log_groups_per_flex;
    2968                 :            : }
    2969                 :            : 
    2970                 :            : #define ext4_std_error(sb, errno)                               \
    2971                 :            : do {                                                            \
    2972                 :            :         if ((errno))                                            \
    2973                 :            :                 __ext4_std_error((sb), __func__, __LINE__, (errno));    \
    2974                 :            : } while (0)
    2975                 :            : 
    2976                 :            : #ifdef CONFIG_SMP
    2977                 :            : /* Each CPU can accumulate percpu_counter_batch clusters in their local
    2978                 :            :  * counters. So we need to make sure we have free clusters more
    2979                 :            :  * than percpu_counter_batch  * nr_cpu_ids. Also add a window of 4 times.
    2980                 :            :  */
    2981                 :            : #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
    2982                 :            : #else
    2983                 :            : #define EXT4_FREECLUSTERS_WATERMARK 0
    2984                 :            : #endif
    2985                 :            : 
    2986                 :            : /* Update i_disksize. Requires i_mutex to avoid races with truncate */
    2987                 :          3 : static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
    2988                 :            : {
    2989                 :          3 :         WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
    2990                 :            :                      !inode_is_locked(inode));
    2991                 :          3 :         down_write(&EXT4_I(inode)->i_data_sem);
    2992                 :          3 :         if (newsize > EXT4_I(inode)->i_disksize)
    2993                 :            :                 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
    2994                 :          3 :         up_write(&EXT4_I(inode)->i_data_sem);
    2995                 :          3 : }
    2996                 :            : 
    2997                 :            : /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
    2998                 :          3 : static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
    2999                 :            : {
    3000                 :            :         int changed = 0;
    3001                 :            : 
    3002                 :          3 :         if (newsize > inode->i_size) {
    3003                 :            :                 i_size_write(inode, newsize);
    3004                 :            :                 changed = 1;
    3005                 :            :         }
    3006                 :          3 :         if (newsize > EXT4_I(inode)->i_disksize) {
    3007                 :          3 :                 ext4_update_i_disksize(inode, newsize);
    3008                 :          3 :                 changed |= 2;
    3009                 :            :         }
    3010                 :          3 :         return changed;
    3011                 :            : }
    3012                 :            : 
    3013                 :            : int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
    3014                 :            :                                       loff_t len);
    3015                 :            : 
    3016                 :            : struct ext4_group_info {
    3017                 :            :         unsigned long   bb_state;
    3018                 :            :         struct rb_root  bb_free_root;
    3019                 :            :         ext4_grpblk_t   bb_first_free;  /* first free block */
    3020                 :            :         ext4_grpblk_t   bb_free;        /* total free blocks */
    3021                 :            :         ext4_grpblk_t   bb_fragments;   /* nr of freespace fragments */
    3022                 :            :         ext4_grpblk_t   bb_largest_free_order;/* order of largest frag in BG */
    3023                 :            :         struct          list_head bb_prealloc_list;
    3024                 :            : #ifdef DOUBLE_CHECK
    3025                 :            :         void            *bb_bitmap;
    3026                 :            : #endif
    3027                 :            :         struct rw_semaphore alloc_sem;
    3028                 :            :         ext4_grpblk_t   bb_counters[];  /* Nr of free power-of-two-block
    3029                 :            :                                          * regions, index is order.
    3030                 :            :                                          * bb_counters[3] = 5 means
    3031                 :            :                                          * 5 free 8-block regions. */
    3032                 :            : };
    3033                 :            : 
    3034                 :            : #define EXT4_GROUP_INFO_NEED_INIT_BIT           0
    3035                 :            : #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT         1
    3036                 :            : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT     2
    3037                 :            : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT     3
    3038                 :            : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT         \
    3039                 :            :         (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
    3040                 :            : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT         \
    3041                 :            :         (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
    3042                 :            : 
    3043                 :            : #define EXT4_MB_GRP_NEED_INIT(grp)      \
    3044                 :            :         (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
    3045                 :            : #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp)        \
    3046                 :            :         (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
    3047                 :            : #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp)        \
    3048                 :            :         (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
    3049                 :            : 
    3050                 :            : #define EXT4_MB_GRP_WAS_TRIMMED(grp)    \
    3051                 :            :         (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
    3052                 :            : #define EXT4_MB_GRP_SET_TRIMMED(grp)    \
    3053                 :            :         (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
    3054                 :            : #define EXT4_MB_GRP_CLEAR_TRIMMED(grp)  \
    3055                 :            :         (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
    3056                 :            : 
    3057                 :            : #define EXT4_MAX_CONTENTION             8
    3058                 :            : #define EXT4_CONTENTION_THRESHOLD       2
    3059                 :            : 
    3060                 :            : static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
    3061                 :            :                                               ext4_group_t group)
    3062                 :            : {
    3063                 :          3 :         return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
    3064                 :            : }
    3065                 :            : 
    3066                 :            : /*
    3067                 :            :  * Returns true if the filesystem is busy enough that attempts to
    3068                 :            :  * access the block group locks has run into contention.
    3069                 :            :  */
    3070                 :            : static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
    3071                 :            : {
    3072                 :          3 :         return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
    3073                 :            : }
    3074                 :            : 
    3075                 :          3 : static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
    3076                 :            : {
    3077                 :            :         spinlock_t *lock = ext4_group_lock_ptr(sb, group);
    3078                 :          3 :         if (spin_trylock(lock))
    3079                 :            :                 /*
    3080                 :            :                  * We're able to grab the lock right away, so drop the
    3081                 :            :                  * lock contention counter.
    3082                 :            :                  */
    3083                 :          3 :                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
    3084                 :            :         else {
    3085                 :            :                 /*
    3086                 :            :                  * The lock is busy, so bump the contention counter,
    3087                 :            :                  * and then wait on the spin lock.
    3088                 :            :                  */
    3089                 :          3 :                 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
    3090                 :            :                                   EXT4_MAX_CONTENTION);
    3091                 :            :                 spin_lock(lock);
    3092                 :            :         }
    3093                 :          3 : }
    3094                 :            : 
    3095                 :            : static inline void ext4_unlock_group(struct super_block *sb,
    3096                 :            :                                         ext4_group_t group)
    3097                 :            : {
    3098                 :            :         spin_unlock(ext4_group_lock_ptr(sb, group));
    3099                 :            : }
    3100                 :            : 
    3101                 :            : /*
    3102                 :            :  * Block validity checking
    3103                 :            :  */
    3104                 :            : #define ext4_check_indirect_blockref(inode, bh)                         \
    3105                 :            :         ext4_check_blockref(__func__, __LINE__, inode,                  \
    3106                 :            :                             (__le32 *)(bh)->b_data,                  \
    3107                 :            :                             EXT4_ADDR_PER_BLOCK((inode)->i_sb))
    3108                 :            : 
    3109                 :            : #define ext4_ind_check_inode(inode)                                     \
    3110                 :            :         ext4_check_blockref(__func__, __LINE__, inode,                  \
    3111                 :            :                             EXT4_I(inode)->i_data,                   \
    3112                 :            :                             EXT4_NDIR_BLOCKS)
    3113                 :            : 
    3114                 :            : /*
    3115                 :            :  * Inodes and files operations
    3116                 :            :  */
    3117                 :            : 
    3118                 :            : /* dir.c */
    3119                 :            : extern const struct file_operations ext4_dir_operations;
    3120                 :            : 
    3121                 :            : #ifdef CONFIG_UNICODE
    3122                 :            : extern const struct dentry_operations ext4_dentry_ops;
    3123                 :            : #endif
    3124                 :            : 
    3125                 :            : /* file.c */
    3126                 :            : extern const struct inode_operations ext4_file_inode_operations;
    3127                 :            : extern const struct file_operations ext4_file_operations;
    3128                 :            : extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
    3129                 :            : 
    3130                 :            : /* inline.c */
    3131                 :            : extern int ext4_get_max_inline_size(struct inode *inode);
    3132                 :            : extern int ext4_find_inline_data_nolock(struct inode *inode);
    3133                 :            : extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
    3134                 :            :                                  unsigned int len);
    3135                 :            : extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
    3136                 :            : 
    3137                 :            : extern int ext4_readpage_inline(struct inode *inode, struct page *page);
    3138                 :            : extern int ext4_try_to_write_inline_data(struct address_space *mapping,
    3139                 :            :                                          struct inode *inode,
    3140                 :            :                                          loff_t pos, unsigned len,
    3141                 :            :                                          unsigned flags,
    3142                 :            :                                          struct page **pagep);
    3143                 :            : extern int ext4_write_inline_data_end(struct inode *inode,
    3144                 :            :                                       loff_t pos, unsigned len,
    3145                 :            :                                       unsigned copied,
    3146                 :            :                                       struct page *page);
    3147                 :            : extern struct buffer_head *
    3148                 :            : ext4_journalled_write_inline_data(struct inode *inode,
    3149                 :            :                                   unsigned len,
    3150                 :            :                                   struct page *page);
    3151                 :            : extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
    3152                 :            :                                            struct inode *inode,
    3153                 :            :                                            loff_t pos, unsigned len,
    3154                 :            :                                            unsigned flags,
    3155                 :            :                                            struct page **pagep,
    3156                 :            :                                            void **fsdata);
    3157                 :            : extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
    3158                 :            :                                          unsigned len, unsigned copied,
    3159                 :            :                                          struct page *page);
    3160                 :            : extern int ext4_try_add_inline_entry(handle_t *handle,
    3161                 :            :                                      struct ext4_filename *fname,
    3162                 :            :                                      struct inode *dir, struct inode *inode);
    3163                 :            : extern int ext4_try_create_inline_dir(handle_t *handle,
    3164                 :            :                                       struct inode *parent,
    3165                 :            :                                       struct inode *inode);
    3166                 :            : extern int ext4_read_inline_dir(struct file *filp,
    3167                 :            :                                 struct dir_context *ctx,
    3168                 :            :                                 int *has_inline_data);
    3169                 :            : extern int ext4_inlinedir_to_tree(struct file *dir_file,
    3170                 :            :                                   struct inode *dir, ext4_lblk_t block,
    3171                 :            :                                   struct dx_hash_info *hinfo,
    3172                 :            :                                   __u32 start_hash, __u32 start_minor_hash,
    3173                 :            :                                   int *has_inline_data);
    3174                 :            : extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
    3175                 :            :                                         struct ext4_filename *fname,
    3176                 :            :                                         struct ext4_dir_entry_2 **res_dir,
    3177                 :            :                                         int *has_inline_data);
    3178                 :            : extern int ext4_delete_inline_entry(handle_t *handle,
    3179                 :            :                                     struct inode *dir,
    3180                 :            :                                     struct ext4_dir_entry_2 *de_del,
    3181                 :            :                                     struct buffer_head *bh,
    3182                 :            :                                     int *has_inline_data);
    3183                 :            : extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
    3184                 :            : extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
    3185                 :            :                                         struct ext4_dir_entry_2 **parent_de,
    3186                 :            :                                         int *retval);
    3187                 :            : extern int ext4_inline_data_fiemap(struct inode *inode,
    3188                 :            :                                    struct fiemap_extent_info *fieinfo,
    3189                 :            :                                    int *has_inline, __u64 start, __u64 len);
    3190                 :            : 
    3191                 :            : struct iomap;
    3192                 :            : extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
    3193                 :            : 
    3194                 :            : extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
    3195                 :            : 
    3196                 :            : extern int ext4_convert_inline_data(struct inode *inode);
    3197                 :            : 
    3198                 :            : static inline int ext4_has_inline_data(struct inode *inode)
    3199                 :            : {
    3200                 :          3 :         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
    3201                 :          0 :                EXT4_I(inode)->i_inline_off;
    3202                 :            : }
    3203                 :            : 
    3204                 :            : /* namei.c */
    3205                 :            : extern const struct inode_operations ext4_dir_inode_operations;
    3206                 :            : extern const struct inode_operations ext4_special_inode_operations;
    3207                 :            : extern struct dentry *ext4_get_parent(struct dentry *child);
    3208                 :            : extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
    3209                 :            :                                  struct ext4_dir_entry_2 *de,
    3210                 :            :                                  int blocksize, int csum_size,
    3211                 :            :                                  unsigned int parent_ino, int dotdot_real_len);
    3212                 :            : extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
    3213                 :            :                                         unsigned int blocksize);
    3214                 :            : extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
    3215                 :            :                                       struct buffer_head *bh);
    3216                 :            : extern int ext4_ci_compare(const struct inode *parent,
    3217                 :            :                            const struct qstr *fname,
    3218                 :            :                            const struct qstr *entry, bool quick);
    3219                 :            : 
    3220                 :            : #define S_SHIFT 12
    3221                 :            : static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
    3222                 :            :         [S_IFREG >> S_SHIFT]      = EXT4_FT_REG_FILE,
    3223                 :            :         [S_IFDIR >> S_SHIFT]      = EXT4_FT_DIR,
    3224                 :            :         [S_IFCHR >> S_SHIFT]      = EXT4_FT_CHRDEV,
    3225                 :            :         [S_IFBLK >> S_SHIFT]      = EXT4_FT_BLKDEV,
    3226                 :            :         [S_IFIFO >> S_SHIFT]      = EXT4_FT_FIFO,
    3227                 :            :         [S_IFSOCK >> S_SHIFT]     = EXT4_FT_SOCK,
    3228                 :            :         [S_IFLNK >> S_SHIFT]      = EXT4_FT_SYMLINK,
    3229                 :            : };
    3230                 :            : 
    3231                 :            : static inline void ext4_set_de_type(struct super_block *sb,
    3232                 :            :                                 struct ext4_dir_entry_2 *de,
    3233                 :            :                                 umode_t mode) {
    3234                 :          3 :         if (ext4_has_feature_filetype(sb))
    3235                 :          3 :                 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
    3236                 :            : }
    3237                 :            : 
    3238                 :            : /* readpages.c */
    3239                 :            : extern int ext4_mpage_readpages(struct address_space *mapping,
    3240                 :            :                                 struct list_head *pages, struct page *page,
    3241                 :            :                                 unsigned nr_pages, bool is_readahead);
    3242                 :            : extern int __init ext4_init_post_read_processing(void);
    3243                 :            : extern void ext4_exit_post_read_processing(void);
    3244                 :            : 
    3245                 :            : /* symlink.c */
    3246                 :            : extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
    3247                 :            : extern const struct inode_operations ext4_symlink_inode_operations;
    3248                 :            : extern const struct inode_operations ext4_fast_symlink_inode_operations;
    3249                 :            : 
    3250                 :            : /* sysfs.c */
    3251                 :            : extern int ext4_register_sysfs(struct super_block *sb);
    3252                 :            : extern void ext4_unregister_sysfs(struct super_block *sb);
    3253                 :            : extern int __init ext4_init_sysfs(void);
    3254                 :            : extern void ext4_exit_sysfs(void);
    3255                 :            : 
    3256                 :            : /* block_validity */
    3257                 :            : extern void ext4_release_system_zone(struct super_block *sb);
    3258                 :            : extern int ext4_setup_system_zone(struct super_block *sb);
    3259                 :            : extern int __init ext4_init_system_zone(void);
    3260                 :            : extern void ext4_exit_system_zone(void);
    3261                 :            : extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
    3262                 :            :                                  ext4_fsblk_t start_blk,
    3263                 :            :                                  unsigned int count);
    3264                 :            : extern int ext4_check_blockref(const char *, unsigned int,
    3265                 :            :                                struct inode *, __le32 *, unsigned int);
    3266                 :            : 
    3267                 :            : /* extents.c */
    3268                 :            : struct ext4_ext_path;
    3269                 :            : struct ext4_extent;
    3270                 :            : 
    3271                 :            : /*
    3272                 :            :  * Maximum number of logical blocks in a file; ext4_extent's ee_block is
    3273                 :            :  * __le32.
    3274                 :            :  */
    3275                 :            : #define EXT_MAX_BLOCKS  0xffffffff
    3276                 :            : 
    3277                 :            : extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
    3278                 :            : extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
    3279                 :            : extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
    3280                 :            : extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
    3281                 :            :                                struct ext4_map_blocks *map, int flags);
    3282                 :            : extern int ext4_ext_truncate(handle_t *, struct inode *);
    3283                 :            : extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
    3284                 :            :                                  ext4_lblk_t end);
    3285                 :            : extern void ext4_ext_init(struct super_block *);
    3286                 :            : extern void ext4_ext_release(struct super_block *);
    3287                 :            : extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
    3288                 :            :                           loff_t len);
    3289                 :            : extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
    3290                 :            :                                           loff_t offset, ssize_t len);
    3291                 :            : extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
    3292                 :            :                            struct ext4_map_blocks *map, int flags);
    3293                 :            : extern int ext4_ext_calc_metadata_amount(struct inode *inode,
    3294                 :            :                                          ext4_lblk_t lblocks);
    3295                 :            : extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
    3296                 :            :                                                    int num,
    3297                 :            :                                                    struct ext4_ext_path *path);
    3298                 :            : extern int ext4_can_extents_be_merged(struct inode *inode,
    3299                 :            :                                       struct ext4_extent *ex1,
    3300                 :            :                                       struct ext4_extent *ex2);
    3301                 :            : extern int ext4_ext_insert_extent(handle_t *, struct inode *,
    3302                 :            :                                   struct ext4_ext_path **,
    3303                 :            :                                   struct ext4_extent *, int);
    3304                 :            : extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
    3305                 :            :                                               struct ext4_ext_path **,
    3306                 :            :                                               int flags);
    3307                 :            : extern void ext4_ext_drop_refs(struct ext4_ext_path *);
    3308                 :            : extern int ext4_ext_check_inode(struct inode *inode);
    3309                 :            : extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
    3310                 :            : extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
    3311                 :            :                         __u64 start, __u64 len);
    3312                 :            : extern int ext4_get_es_cache(struct inode *inode,
    3313                 :            :                              struct fiemap_extent_info *fieinfo,
    3314                 :            :                              __u64 start, __u64 len);
    3315                 :            : extern int ext4_ext_precache(struct inode *inode);
    3316                 :            : extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
    3317                 :            : extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
    3318                 :            : extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
    3319                 :            :                                 struct inode *inode2, ext4_lblk_t lblk1,
    3320                 :            :                              ext4_lblk_t lblk2,  ext4_lblk_t count,
    3321                 :            :                              int mark_unwritten,int *err);
    3322                 :            : extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
    3323                 :            : 
    3324                 :            : /* move_extent.c */
    3325                 :            : extern void ext4_double_down_write_data_sem(struct inode *first,
    3326                 :            :                                             struct inode *second);
    3327                 :            : extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
    3328                 :            :                                           struct inode *donor_inode);
    3329                 :            : extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
    3330                 :            :                              __u64 start_orig, __u64 start_donor,
    3331                 :            :                              __u64 len, __u64 *moved_len);
    3332                 :            : 
    3333                 :            : /* page-io.c */
    3334                 :            : extern int __init ext4_init_pageio(void);
    3335                 :            : extern void ext4_exit_pageio(void);
    3336                 :            : extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
    3337                 :            : extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
    3338                 :            : extern int ext4_put_io_end(ext4_io_end_t *io_end);
    3339                 :            : extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
    3340                 :            : extern void ext4_io_submit_init(struct ext4_io_submit *io,
    3341                 :            :                                 struct writeback_control *wbc);
    3342                 :            : extern void ext4_end_io_rsv_work(struct work_struct *work);
    3343                 :            : extern void ext4_io_submit(struct ext4_io_submit *io);
    3344                 :            : extern int ext4_bio_write_page(struct ext4_io_submit *io,
    3345                 :            :                                struct page *page,
    3346                 :            :                                int len,
    3347                 :            :                                struct writeback_control *wbc,
    3348                 :            :                                bool keep_towrite);
    3349                 :            : 
    3350                 :            : /* mmp.c */
    3351                 :            : extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
    3352                 :            : 
    3353                 :            : /* verity.c */
    3354                 :            : extern const struct fsverity_operations ext4_verityops;
    3355                 :            : 
    3356                 :            : /*
    3357                 :            :  * Add new method to test whether block and inode bitmaps are properly
    3358                 :            :  * initialized. With uninit_bg reading the block from disk is not enough
    3359                 :            :  * to mark the bitmap uptodate. We need to also zero-out the bitmap
    3360                 :            :  */
    3361                 :            : #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
    3362                 :            : 
    3363                 :          3 : static inline int bitmap_uptodate(struct buffer_head *bh)
    3364                 :            : {
    3365                 :          3 :         return (buffer_uptodate(bh) &&
    3366                 :            :                         test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
    3367                 :            : }
    3368                 :            : static inline void set_bitmap_uptodate(struct buffer_head *bh)
    3369                 :            : {
    3370                 :          3 :         set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
    3371                 :            : }
    3372                 :            : 
    3373                 :            : #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
    3374                 :            : 
    3375                 :            : /* For ioend & aio unwritten conversion wait queues */
    3376                 :            : #define EXT4_WQ_HASH_SZ         37
    3377                 :            : #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
    3378                 :            :                                             EXT4_WQ_HASH_SZ])
    3379                 :            : extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
    3380                 :            : 
    3381                 :            : extern int ext4_resize_begin(struct super_block *sb);
    3382                 :            : extern void ext4_resize_end(struct super_block *sb);
    3383                 :            : 
    3384                 :          0 : static inline void ext4_set_io_unwritten_flag(struct inode *inode,
    3385                 :            :                                               struct ext4_io_end *io_end)
    3386                 :            : {
    3387                 :          0 :         if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
    3388                 :          0 :                 io_end->flag |= EXT4_IO_END_UNWRITTEN;
    3389                 :          0 :                 atomic_inc(&EXT4_I(inode)->i_unwritten);
    3390                 :            :         }
    3391                 :          0 : }
    3392                 :            : 
    3393                 :          0 : static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
    3394                 :            : {
    3395                 :          0 :         struct inode *inode = io_end->inode;
    3396                 :            : 
    3397                 :          0 :         if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
    3398                 :          0 :                 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
    3399                 :            :                 /* Wake up anyone waiting on unwritten extent conversion */
    3400                 :          0 :                 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
    3401                 :          0 :                         wake_up_all(ext4_ioend_wq(inode));
    3402                 :            :         }
    3403                 :          0 : }
    3404                 :            : 
    3405                 :            : extern const struct iomap_ops ext4_iomap_ops;
    3406                 :            : 
    3407                 :          3 : static inline int ext4_buffer_uptodate(struct buffer_head *bh)
    3408                 :            : {
    3409                 :            :         /*
    3410                 :            :          * If the buffer has the write error flag, we have failed
    3411                 :            :          * to write out data in the block.  In this  case, we don't
    3412                 :            :          * have to read the block because we may read the old data
    3413                 :            :          * successfully.
    3414                 :            :          */
    3415                 :          3 :         if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
    3416                 :            :                 set_buffer_uptodate(bh);
    3417                 :          3 :         return buffer_uptodate(bh);
    3418                 :            : }
    3419                 :            : 
    3420                 :            : #endif  /* __KERNEL__ */
    3421                 :            : 
    3422                 :            : #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
    3423                 :            : #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
    3424                 :            : 
    3425                 :            : #endif  /* _EXT4_H */
    

Generated by: LCOV version 1.14