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