65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/*
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* Definitions of structures for vfsv0 quota format
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*/
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#ifndef _LINUX_QUOTA_TREE_H
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#define _LINUX_QUOTA_TREE_H
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#include <sys/types.h>
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typedef __u32 qid_t; /* Type in which we store ids in memory */
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#define QT_TREEOFF 1 /* Offset of tree in file in blocks */
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#define QT_TREEDEPTH 4 /* Depth of quota tree */
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#define QT_BLKSIZE_BITS 10
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#define QT_BLKSIZE (1 << QT_BLKSIZE_BITS) /* Size of block with quota
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* structures */
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/*
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* Structure of header of block with quota structures. It is padded to 16 bytes
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* so there will be space for exactly 21 quota-entries in a block
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*/
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struct qt_disk_dqdbheader {
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__le32 dqdh_next_free; /* Number of next block with free
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* entry */
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__le32 dqdh_prev_free; /* Number of previous block with free
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* entry */
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__le16 dqdh_entries; /* Number of valid entries in block */
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__le16 dqdh_pad1;
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__le32 dqdh_pad2;
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} __attribute__ ((packed));
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struct dquot;
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struct quota_handle;
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/* Operations */
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struct qtree_fmt_operations {
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/* Convert given entry from in memory format to disk one */
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void (*mem2disk_dqblk)(void *disk, struct dquot *dquot);
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/* Convert given entry from disk format to in memory one */
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void (*disk2mem_dqblk)(struct dquot *dquot, void *disk);
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/* Is this structure for given id? */
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int (*is_id)(void *disk, struct dquot *dquot);
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};
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/* In-memory copy of version specific information */
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struct qtree_mem_dqinfo {
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unsigned int dqi_blocks; /* # of blocks in quota file */
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unsigned int dqi_free_blk; /* First block in list of free blocks */
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unsigned int dqi_free_entry; /* First block with free entry */
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unsigned int dqi_entry_size; /* Size of quota entry in quota file */
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struct qtree_fmt_operations *dqi_ops; /* Operations for entry
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* manipulation */
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};
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void qtree_write_dquot(struct dquot *dquot);
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struct dquot *qtree_read_dquot(struct quota_handle *h, qid_t id);
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void qtree_delete_dquot(struct dquot *dquot);
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int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk);
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int qtree_scan_dquots(struct quota_handle *h,
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int (*process_dquot) (struct dquot *, void *), void *data);
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int qtree_dqstr_in_blk(struct qtree_mem_dqinfo *info);
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#endif /* _LINUX_QUOTAIO_TREE_H */
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