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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 */
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