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