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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 */ 57: