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