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