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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Definitions of structures for vfsv0 quota format
3 */
4
5#ifndef _LINUX_QUOTAIO_V2_H
6#define _LINUX_QUOTAIO_V2_H
7
8#include <linux/types.h>
9#include <linux/quota.h>
10
11/*
12 * Definitions of magics and versions of current quota files
13 */
14#define V2_INITQMAGICS {\
15 0xd9c01f11, /* USRQUOTA */\
16 0xd9c01927 /* GRPQUOTA */\
17}
18
19#define V2_INITQVERSIONS {\
20 0, /* USRQUOTA */\
21 0 /* GRPQUOTA */\
22}
23
24/*
25 * The following structure defines the format of the disk quota file
26 * (as it appears on disk) - the file is a radix tree whose leaves point
27 * to blocks of these structures.
28 */
29struct v2_disk_dqblk {
30 __le32 dqb_id; /* id this quota applies to */
31 __le32 dqb_ihardlimit; /* absolute limit on allocated inodes */
32 __le32 dqb_isoftlimit; /* preferred inode limit */
33 __le32 dqb_curinodes; /* current # allocated inodes */
34 __le32 dqb_bhardlimit; /* absolute limit on disk space (in QUOTABLOCK_SIZE) */
35 __le32 dqb_bsoftlimit; /* preferred limit on disk space (in QUOTABLOCK_SIZE) */
36 __le64 dqb_curspace; /* current space occupied (in bytes) */
37 __le64 dqb_btime; /* time limit for excessive disk use */
38 __le64 dqb_itime; /* time limit for excessive inode use */
39};
40
41/*
42 * Here are header structures as written on disk and their in-memory copies
43 */
44/* First generic header */
45struct v2_disk_dqheader {
46 __le32 dqh_magic; /* Magic number identifying file */
47 __le32 dqh_version; /* File version */
48};
49
50/* Header with type and version specific information */
51struct v2_disk_dqinfo {
52 __le32 dqi_bgrace; /* Time before block soft limit becomes hard limit */
53 __le32 dqi_igrace; /* Time before inode soft limit becomes hard limit */
54 __le32 dqi_flags; /* Flags for quotafile (DQF_*) */
55 __le32 dqi_blocks; /* Number of blocks in file */
56 __le32 dqi_free_blk; /* Number of first free block in the list */
57 __le32 dqi_free_entry; /* Number of block with at least one free entry */
58};
59
60/*
61 * Structure of header of block with quota structures. It is padded to 16 bytes so
62 * there will be space for exactly 21 quota-entries in a block
63 */
64struct v2_disk_dqdbheader {
65 __le32 dqdh_next_free; /* Number of next block with free entry */
66 __le32 dqdh_prev_free; /* Number of previous block with free entry */
67 __le16 dqdh_entries; /* Number of valid entries in block */
68 __le16 dqdh_pad1;
69 __le32 dqdh_pad2;
70};
71
72#define V2_DQINFOOFF sizeof(struct v2_disk_dqheader) /* Offset of info header in file */
73#define V2_DQBLKSIZE_BITS 10
74#define V2_DQBLKSIZE (1 << V2_DQBLKSIZE_BITS) /* Size of block with quota structures */
75#define V2_DQTREEOFF 1 /* Offset of tree in file in blocks */
76#define V2_DQTREEDEPTH 4 /* Depth of quota tree */
77#define V2_DQSTRINBLK ((V2_DQBLKSIZE - sizeof(struct v2_disk_dqdbheader)) / sizeof(struct v2_disk_dqblk)) /* Number of entries in one blocks */
78
79#endif /* _LINUX_QUOTAIO_V2_H */