jbd2.h

   1 /****************************************************************************
   2  ****************************************************************************
   3  ***
   4  ***   This header was automatically generated from a Linux kernel header
   5  ***   of the same name, to make information necessary for userspace to
   6  ***   call into the kernel available to libc.  It contains only constants,
   7  ***   structures, and macros generated from the original header, and thus,
   8  ***   contains no copyrightable information.
   9  ***
  10  ****************************************************************************
  11  ****************************************************************************/
  12 #ifndef _LINUX_JBD2_H
  13 #define _LINUX_JBD2_H
  14
  15 #define JBD2_DEBUG
  16 #define jfs_debug jbd_debug
  17
  18 #define journal_oom_retry 1
  19
  20 #undef JBD2_PARANOID_IOFAIL
  21
  22 #define JBD2_DEFAULT_MAX_COMMIT_AGE 5
  23
  24 #define jbd_debug(f, a...)
  25
  26 #define JBD2_MIN_JOURNAL_BLOCKS 1024
  27
  28 #define JBD2_MAGIC_NUMBER 0xc03b3998U
  29
  30 #define JBD2_DESCRIPTOR_BLOCK 1
  31 #define JBD2_COMMIT_BLOCK 2
  32 #define JBD2_SUPERBLOCK_V1 3
  33 #define JBD2_SUPERBLOCK_V2 4
  34 #define JBD2_REVOKE_BLOCK 5
  35
  36 typedef struct journal_header_s
  37 {
  38  __be32 h_magic;
  39  __be32 h_blocktype;
  40  __be32 h_sequence;
  41 } journal_header_t;
  42
  43 #define JBD2_CRC32_CHKSUM 1
  44 #define JBD2_MD5_CHKSUM 2
  45 #define JBD2_SHA1_CHKSUM 3
  46
  47 #define JBD2_CRC32_CHKSUM_SIZE 4
  48
  49 #define JBD2_CHECKSUM_BYTES (32 / sizeof(__u32))
  50
  51 struct commit_header {
  52  __be32 h_magic;
  53  __be32 h_blocktype;
  54  __be32 h_sequence;
  55  unsigned char h_chksum_type;
  56  unsigned char h_chksum_size;
  57  unsigned char h_padding[2];
  58  __be32 h_chksum[JBD2_CHECKSUM_BYTES];
  59  __be64 h_commit_sec;
  60  __be32 h_commit_nsec;
  61 };
  62
  63 typedef struct journal_block_tag_s
  64 {
  65  __be32 t_blocknr;
  66  __be32 t_flags;
  67  __be32 t_blocknr_high;
  68 } journal_block_tag_t;
  69
  70 #define JBD2_TAG_SIZE32 (offsetof(journal_block_tag_t, t_blocknr_high))
  71 #define JBD2_TAG_SIZE64 (sizeof(journal_block_tag_t))
  72
  73 typedef struct jbd2_journal_revoke_header_s
  74 {
  75  journal_header_t r_header;
  76  __be32 r_count;
  77 } jbd2_journal_revoke_header_t;
  78
  79 #define JBD2_FLAG_ESCAPE 1
  80 #define JBD2_FLAG_SAME_UUID 2
  81 #define JBD2_FLAG_DELETED 4
  82 #define JBD2_FLAG_LAST_TAG 8
  83
  84 typedef struct journal_superblock_s
  85 {
  86
  87  journal_header_t s_header;
  88
  89  __be32 s_blocksize;
  90  __be32 s_maxlen;
  91  __be32 s_first;
  92
  93  __be32 s_sequence;
  94  __be32 s_start;
  95
  96  __be32 s_errno;
  97
  98  __be32 s_feature_compat;
  99  __be32 s_feature_incompat;
 100  __be32 s_feature_ro_compat;
 101
 102  __u8 s_uuid[16];
 103
 104  __be32 s_nr_users;
 105
 106  __be32 s_dynsuper;
 107
 108  __be32 s_max_transaction;
 109  __be32 s_max_trans_data;
 110
 111  __u32 s_padding[44];
 112
 113  __u8 s_users[16*48];
 114
 115 } journal_superblock_t;
 116
 117 #define JBD2_HAS_COMPAT_FEATURE(j,mask)   ((j)->j_format_version >= 2 &&   ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
 118 #define JBD2_HAS_RO_COMPAT_FEATURE(j,mask)   ((j)->j_format_version >= 2 &&   ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
 119 #define JBD2_HAS_INCOMPAT_FEATURE(j,mask)   ((j)->j_format_version >= 2 &&   ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
 120
 121 #define JBD2_FEATURE_COMPAT_CHECKSUM 0x00000001
 122
 123 #define JBD2_FEATURE_INCOMPAT_REVOKE 0x00000001
 124 #define JBD2_FEATURE_INCOMPAT_64BIT 0x00000002
 125 #define JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT 0x00000004
 126
 127 #define JBD2_KNOWN_COMPAT_FEATURES JBD2_FEATURE_COMPAT_CHECKSUM
 128 #define JBD2_KNOWN_ROCOMPAT_FEATURES 0
 129 #define JBD2_KNOWN_INCOMPAT_FEATURES (JBD2_FEATURE_INCOMPAT_REVOKE |   JBD2_FEATURE_INCOMPAT_64BIT |   JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)
 130
 131 #define BJ_None 0
 132 #define BJ_Metadata 1
 133 #define BJ_Forget 2
 134 #define BJ_IO 3
 135 #define BJ_Shadow 4
 136 #define BJ_LogCtl 5
 137 #define BJ_Reserved 6
 138 #define BJ_Types 7
 139
 140 #endif
 141