| Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 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 | for (i = 1; entries < (1ULL << 32); i++) |
| 52 | entries *= epb; |
| 53 | return i; |
| 54 | } |
| 55 | |
| 56 | #endif /* _LINUX_DQBLK_QTREE_H */ |