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- /*
- * Definitions of structures and functions for quota formats using trie
- */
- #ifndef _LINUX_DQBLK_QTREE_H
- #define _LINUX_DQBLK_QTREE_H
- #include <linux/types.h>
- /* Numbers of blocks needed for updates - we count with the smallest
- * possible block size (1024) */
- #define QTREE_INIT_ALLOC 4
- #define QTREE_INIT_REWRITE 2
- #define QTREE_DEL_ALLOC 0
- #define QTREE_DEL_REWRITE 6
- struct dquot;
- /* Operations */
- struct qtree_fmt_operations {
- void (*mem2disk_dqblk)(void *disk, struct dquot *dquot); /* Convert given entry from in memory format to disk one */
- void (*disk2mem_dqblk)(struct dquot *dquot, void *disk); /* Convert given entry from disk format to in memory one */
- int (*is_id)(void *disk, struct dquot *dquot); /* Is this structure for given id? */
- };
- /* Inmemory copy of version specific information */
- struct qtree_mem_dqinfo {
- struct super_block *dqi_sb; /* Sb quota is on */
- int dqi_type; /* Quota type */
- unsigned int dqi_blocks; /* # of blocks in quota file */
- unsigned int dqi_free_blk; /* First block in list of free blocks */
- unsigned int dqi_free_entry; /* First block with free entry */
- unsigned int dqi_blocksize_bits; /* Block size of quota file */
- unsigned int dqi_entry_size; /* Size of quota entry in quota file */
- unsigned int dqi_usable_bs; /* Space usable in block for quota data */
- unsigned int dqi_qtree_depth; /* Precomputed depth of quota tree */
- struct qtree_fmt_operations *dqi_ops; /* Operations for entry manipulation */
- };
- int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
- int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
- int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
- int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
- int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk);
- static inline int qtree_depth(struct qtree_mem_dqinfo *info)
- {
- unsigned int epb = info->dqi_usable_bs >> 2;
- unsigned long long entries = epb;
- int i;
- for (i = 1; entries < (1ULL << 32); i++)
- entries *= epb;
- return i;
- }
- #endif /* _LINUX_DQBLK_QTREE_H */
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