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       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : /*
       3                 :            :  *      Definitions of structures and functions for quota formats using trie
       4                 :            :  */
       5                 :            : 
       6                 :            : #ifndef _LINUX_DQBLK_QTREE_H
       7                 :            : #define _LINUX_DQBLK_QTREE_H
       8                 :            : 
       9                 :            : #include <linux/types.h>
      10                 :            : 
      11                 :            : /* Numbers of blocks needed for updates - we count with the smallest
      12                 :            :  * possible block size (1024) */
      13                 :            : #define QTREE_INIT_ALLOC 4
      14                 :            : #define QTREE_INIT_REWRITE 2
      15                 :            : #define QTREE_DEL_ALLOC 0
      16                 :            : #define QTREE_DEL_REWRITE 6
      17                 :            : 
      18                 :            : struct dquot;
      19                 :            : struct kqid;
      20                 :            : 
      21                 :            : /* Operations */
      22                 :            : struct qtree_fmt_operations {
      23                 :            :         void (*mem2disk_dqblk)(void *disk, struct dquot *dquot);        /* Convert given entry from in memory format to disk one */
      24                 :            :         void (*disk2mem_dqblk)(struct dquot *dquot, void *disk);        /* Convert given entry from disk format to in memory one */
      25                 :            :         int (*is_id)(void *disk, struct dquot *dquot);  /* Is this structure for given id? */
      26                 :            : };
      27                 :            : 
      28                 :            : /* Inmemory copy of version specific information */
      29                 :            : struct qtree_mem_dqinfo {
      30                 :            :         struct super_block *dqi_sb;     /* Sb quota is on */
      31                 :            :         int dqi_type;                   /* Quota type */
      32                 :            :         unsigned int dqi_blocks;        /* # of blocks in quota file */
      33                 :            :         unsigned int dqi_free_blk;      /* First block in list of free blocks */
      34                 :            :         unsigned int dqi_free_entry;    /* First block with free entry */
      35                 :            :         unsigned int dqi_blocksize_bits;        /* Block size of quota file */
      36                 :            :         unsigned int dqi_entry_size;    /* Size of quota entry in quota file */
      37                 :            :         unsigned int dqi_usable_bs;     /* Space usable in block for quota data */
      38                 :            :         unsigned int dqi_qtree_depth;   /* Precomputed depth of quota tree */
      39                 :            :         const struct qtree_fmt_operations *dqi_ops; /* Operations for entry manipulation */
      40                 :            : };
      41                 :            : 
      42                 :            : int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
      43                 :            : int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
      44                 :            : int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
      45                 :            : int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
      46                 :            : int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk);
      47                 :          0 : static inline int qtree_depth(struct qtree_mem_dqinfo *info)
      48                 :            : {
      49                 :          0 :         unsigned int epb = info->dqi_usable_bs >> 2;
      50                 :          0 :         unsigned long long entries = epb;
      51                 :          0 :         int i;
      52                 :            : 
      53         [ #  # ]:          0 :         for (i = 1; entries < (1ULL << 32); i++)
      54                 :          0 :                 entries *= epb;
      55         [ #  # ]:          0 :         return i;
      56                 :            : }
      57                 :            : int qtree_get_next_id(struct qtree_mem_dqinfo *info, struct kqid *qid);
      58                 :            : 
      59                 :            : #endif /* _LINUX_DQBLK_QTREE_H */