source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/jfs_dat.h @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 13 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.5 KB
Line 
1/*
2 * jfs_dat.h --- stripped down header file which only contains the JFS
3 *  on-disk data structures
4 */
5
6#define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
7
8/*
9 * On-disk structures
10 */
11
12/*
13 * Descriptor block types:
14 */
15
16#define JFS_DESCRIPTOR_BLOCK    1
17#define JFS_COMMIT_BLOCK    2
18#define JFS_SUPERBLOCK      3
19
20/*
21 * Standard header for all descriptor blocks:
22 */
23typedef struct journal_header_s
24{
25    __u32       h_magic;
26    __u32       h_blocktype;
27    __u32       h_sequence;
28} journal_header_t;
29
30
31/*
32 * The block tag: used to describe a single buffer in the journal
33 */
34typedef struct journal_block_tag_s
35{
36    __u32       t_blocknr;  /* The on-disk block number */
37    __u32       t_flags;    /* See below */
38} journal_block_tag_t;
39
40/* Definitions for the journal tag flags word: */
41#define JFS_FLAG_ESCAPE     1   /* on-disk block is escaped */
42#define JFS_FLAG_SAME_UUID  2   /* block has same uuid as previous */
43#define JFS_FLAG_DELETED    4   /* block deleted by this transaction */
44#define JFS_FLAG_LAST_TAG   8   /* last tag in this descriptor block */
45
46
47/*
48 * The journal superblock
49 */
50typedef struct journal_superblock_s
51{
52    journal_header_t s_header;
53
54    /* Static information describing the journal */
55    __u32       s_blocksize;    /* journal device blocksize */
56    __u32       s_maxlen;   /* total blocks in journal file */
57    __u32       s_first;    /* first block of log information */
58
59    /* Dynamic information describing the current state of the log */
60    __u32       s_sequence; /* first commit ID expected in log */
61    __u32       s_start;    /* blocknr of start of log */
62
63} journal_superblock_t;
64
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