dqblk_qtree.h
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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 */