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 141 142