quotaio_tree.h

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/*
 * Definitions of structures for vfsv0 quota format
 */
 
#ifndef _LINUX_QUOTA_TREE_H
#define _LINUX_QUOTA_TREE_H
 
#include <inttypes.h>
#ifdef HAVE_LINUX_TYPES_H
#include <linux/types.h>
#endif
#include <sys/types.h>
 
#include <f2fs_fs.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;
};
 
static_assert(sizeof(struct qt_disk_dqdbheader) == 16, "");
 
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);
};
 
/* Inmemory 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 */
};
 
int 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 */