libinstaller/ext2fs/ext2_fs.h

   1 /*
   2  *  linux/include/linux/ext2_fs.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _EXT2FS_EXT2_FS_H
  17 #define _EXT2FS_EXT2_FS_H
  18
  19 #include <linux/types.h>
  20
  21 /*
  22  * The second extended filesystem constants/structures
  23  */
  24
  25 /*
  26  * Define EXT2FS_DEBUG to produce debug messages
  27  */
  28 #undef EXT2FS_DEBUG
  29
  30 /*
  31  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  32  */
  33 #define EXT2_PREALLOCATE
  34 #define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  35
  36 /*
  37  * The second extended file system version
  38  */
  39 #define EXT2FS_DATE             "95/08/09"
  40 #define EXT2FS_VERSION          "0.5b"
  41
  42 /*
  43  * Special inode numbers
  44  */
  45 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  46 #define EXT2_ROOT_INO            2      /* Root inode */
  47 #define EXT4_USR_QUOTA_INO       3      /* User quota inode */
  48 #define EXT4_GRP_QUOTA_INO       4      /* Group quota inode */
  49 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  50 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  51 #define EXT2_RESIZE_INO          7      /* Reserved group descriptors inode */
  52 #define EXT2_JOURNAL_INO         8      /* Journal inode */
  53 #define EXT2_EXCLUDE_INO         9      /* The "exclude" inode, for snapshots */
  54 #define EXT4_REPLICA_INO        10      /* Used by non-upstream feature */
  55
  56 /* First non-reserved inode for old ext2 filesystems */
  57 #define EXT2_GOOD_OLD_FIRST_INO 11
  58
  59 /*
  60  * The second extended file system magic number
  61  */
  62 #define EXT2_SUPER_MAGIC        0xEF53
  63
  64 #ifdef __KERNEL__
  65 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
  66 #else
  67 /* Assume that user mode programs are passing in an ext2fs superblock, not
  68  * a kernel struct super_block.  This will allow us to call the feature-test
  69  * macros from user land. */
  70 #define EXT2_SB(sb)     (sb)
  71 #endif
  72
  73 /*
  74  * Maximal count of links to a file
  75  */
  76 #define EXT2_LINK_MAX           65000
  77
  78 /*
  79  * Macro-instructions used to manage several block sizes
  80  */
  81 #define EXT2_MIN_BLOCK_LOG_SIZE         10      /* 1024 */
  82 #define EXT2_MAX_BLOCK_LOG_SIZE         16      /* 65536 */
  83 #define EXT2_MIN_BLOCK_SIZE     (1 << EXT2_MIN_BLOCK_LOG_SIZE)
  84 #define EXT2_MAX_BLOCK_SIZE     (1 << EXT2_MAX_BLOCK_LOG_SIZE)
  85 #ifdef __KERNEL__
  86 #define EXT2_BLOCK_SIZE(s)      ((s)->s_blocksize)
  87 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
  88 #define EXT2_ADDR_PER_BLOCK_BITS(s)     (EXT2_SB(s)->addr_per_block_bits)
  89 #define EXT2_INODE_SIZE(s)      (EXT2_SB(s)->s_inode_size)
  90 #define EXT2_FIRST_INO(s)       (EXT2_SB(s)->s_first_ino)
  91 #else
  92 #define EXT2_BLOCK_SIZE(s)      (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  93 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
  94 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  95                                  EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
  96 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  97                                  EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
  98 #endif
  99 #define EXT2_ADDR_PER_BLOCK(s)  (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
 100
 101 /*
 102  * Macro-instructions used to manage allocation clusters
 103  */
 104 #define EXT2_MIN_CLUSTER_LOG_SIZE       EXT2_MIN_BLOCK_LOG_SIZE
 105 #define EXT2_MAX_CLUSTER_LOG_SIZE       29      /* 512MB  */
 106 #define EXT2_MIN_CLUSTER_SIZE           EXT2_MIN_BLOCK_SIZE
 107 #define EXT2_MAX_CLUSTER_SIZE           (1 << EXT2_MAX_CLUSTER_LOG_SIZE)
 108 #define EXT2_CLUSTER_SIZE(s)            (EXT2_MIN_BLOCK_SIZE << \
 109                                                 (s)->s_log_cluster_size)
 110 #define EXT2_CLUSTER_SIZE_BITS(s)       ((s)->s_log_cluster_size + 10)
 111
 112 /*
 113  * Macro-instructions used to manage fragments
 114  *
 115  * Note: for backwards compatibility only, for the dump program.
 116  * Ext2/3/4 will never support fragments....
 117  */
 118 #define EXT2_MIN_FRAG_SIZE              EXT2_MIN_BLOCK_SIZE
 119 #define EXT2_MAX_FRAG_SIZE              EXT2_MAX_BLOCK_SIZE
 120 #define EXT2_MIN_FRAG_LOG_SIZE          EXT2_MIN_BLOCK_LOG_SIZE
 121 #define EXT2_FRAG_SIZE(s)               EXT2_BLOCK_SIZE(s)
 122 #define EXT2_FRAGS_PER_BLOCK(s)         1
 123
 124 /*
 125  * ACL structures
 126  */
 127 struct ext2_acl_header  /* Header of Access Control Lists */
 128 {
 129         __u32   aclh_size;
 130         __u32   aclh_file_count;
 131         __u32   aclh_acle_count;
 132         __u32   aclh_first_acle;
 133 };
 134
 135 struct ext2_acl_entry   /* Access Control List Entry */
 136 {
 137         __u32   acle_size;
 138         __u16   acle_perms;     /* Access permissions */
 139         __u16   acle_type;      /* Type of entry */
 140         __u16   acle_tag;       /* User or group identity */
 141         __u16   acle_pad1;
 142         __u32   acle_next;      /* Pointer on next entry for the */
 143                                         /* same inode or on next free entry */
 144 };
 145
 146 /*
 147  * Structure of a blocks group descriptor
 148  */
 149 struct ext2_group_desc
 150 {
 151         __u32   bg_block_bitmap;        /* Blocks bitmap block */
 152         __u32   bg_inode_bitmap;        /* Inodes bitmap block */
 153         __u32   bg_inode_table;         /* Inodes table block */
 154         __u16   bg_free_blocks_count;   /* Free blocks count */
 155         __u16   bg_free_inodes_count;   /* Free inodes count */
 156         __u16   bg_used_dirs_count;     /* Directories count */
 157         __u16   bg_flags;
 158         __u32   bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 159         __u16   bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
 160         __u16   bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
 161         __u16   bg_itable_unused;       /* Unused inodes count */
 162         __u16   bg_checksum;            /* crc16(s_uuid+grouo_num+group_desc)*/
 163 };
 164
 165 /*
 166  * Structure of a blocks group descriptor
 167  */
 168 struct ext4_group_desc
 169 {
 170         __u32   bg_block_bitmap;        /* Blocks bitmap block */
 171         __u32   bg_inode_bitmap;        /* Inodes bitmap block */
 172         __u32   bg_inode_table;         /* Inodes table block */
 173         __u16   bg_free_blocks_count;   /* Free blocks count */
 174         __u16   bg_free_inodes_count;   /* Free inodes count */
 175         __u16   bg_used_dirs_count;     /* Directories count */
 176         __u16   bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */
 177         __u32   bg_exclude_bitmap_lo;   /* Exclude bitmap for snapshots */
 178         __u16   bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
 179         __u16   bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
 180         __u16   bg_itable_unused;       /* Unused inodes count */
 181         __u16   bg_checksum;            /* crc16(sb_uuid+group+desc) */
 182         __u32   bg_block_bitmap_hi;     /* Blocks bitmap block MSB */
 183         __u32   bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */
 184         __u32   bg_inode_table_hi;      /* Inodes table block MSB */
 185         __u16   bg_free_blocks_count_hi;/* Free blocks count MSB */
 186         __u16   bg_free_inodes_count_hi;/* Free inodes count MSB */
 187         __u16   bg_used_dirs_count_hi;  /* Directories count MSB */
 188         __u16   bg_itable_unused_hi;    /* Unused inodes count MSB */
 189         __u32   bg_exclude_bitmap_hi;   /* Exclude bitmap block MSB */
 190         __u16   bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
 191         __u16   bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
 192         __u32   bg_reserved;
 193 };
 194
 195 #define EXT2_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not initialized */
 196 #define EXT2_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not initialized */
 197 #define EXT2_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */
 198
 199 /*
 200  * Data structures used by the directory indexing feature
 201  *
 202  * Note: all of the multibyte integer fields are little endian.
 203  */
 204
 205 /*
 206  * Note: dx_root_info is laid out so that if it should somehow get
 207  * overlaid by a dirent the two low bits of the hash version will be
 208  * zero.  Therefore, the hash version mod 4 should never be 0.
 209  * Sincerely, the paranoia department.
 210  */
 211 struct ext2_dx_root_info {
 212         __u32 reserved_zero;
 213         __u8 hash_version; /* 0 now, 1 at release */
 214         __u8 info_length; /* 8 */
 215         __u8 indirect_levels;
 216         __u8 unused_flags;
 217 };
 218
 219 #define EXT2_HASH_LEGACY                0
 220 #define EXT2_HASH_HALF_MD4              1
 221 #define EXT2_HASH_TEA                   2
 222 #define EXT2_HASH_LEGACY_UNSIGNED       3 /* reserved for userspace lib */
 223 #define EXT2_HASH_HALF_MD4_UNSIGNED     4 /* reserved for userspace lib */
 224 #define EXT2_HASH_TEA_UNSIGNED          5 /* reserved for userspace lib */
 225
 226 #define EXT2_HASH_FLAG_INCOMPAT 0x1
 227
 228 struct ext2_dx_entry {
 229         __u32 hash;
 230         __u32 block;
 231 };
 232
 233 struct ext2_dx_countlimit {
 234         __u16 limit;
 235         __u16 count;
 236 };
 237
 238
 239 /*
 240  * Macro-instructions used to manage group descriptors
 241  */
 242 #define EXT2_MIN_DESC_SIZE             32
 243 #define EXT2_MIN_DESC_SIZE_64BIT       64
 244 #define EXT2_MAX_DESC_SIZE             EXT2_MIN_BLOCK_SIZE
 245 #define EXT2_DESC_SIZE(s)                                                \
 246        ((EXT2_SB(s)->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) ? \
 247         (s)->s_desc_size : EXT2_MIN_DESC_SIZE)
 248
 249 #define EXT2_BLOCKS_PER_GROUP(s)        (EXT2_SB(s)->s_blocks_per_group)
 250 #define EXT2_INODES_PER_GROUP(s)        (EXT2_SB(s)->s_inodes_per_group)
 251 #define EXT2_CLUSTERS_PER_GROUP(s)      (EXT2_SB(s)->s_clusters_per_group)
 252 #define EXT2_INODES_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
 253 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
 254 #define EXT2_MAX_BLOCKS_PER_GROUP(s)    ((((unsigned) 1 << 16) - 8) *   \
 255                                          (EXT2_CLUSTER_SIZE(s) / \
 256                                           EXT2_BLOCK_SIZE(s)))
 257 #define EXT2_MAX_CLUSTERS_PER_GROUP(s)  (((unsigned) 1 << 16) - 8)
 258 #define EXT2_MAX_INODES_PER_GROUP(s)    (((unsigned) 1 << 16) - \
 259                                          EXT2_INODES_PER_BLOCK(s))
 260 #ifdef __KERNEL__
 261 #define EXT2_DESC_PER_BLOCK(s)          (EXT2_SB(s)->s_desc_per_block)
 262 #define EXT2_DESC_PER_BLOCK_BITS(s)     (EXT2_SB(s)->s_desc_per_block_bits)
 263 #else
 264 #define EXT2_DESC_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / EXT2_DESC_SIZE(s))
 265 #endif
 266
 267 /*
 268  * Constants relative to the data blocks
 269  */
 270 #define EXT2_NDIR_BLOCKS                12
 271 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 272 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 273 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 274 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 275
 276 /*
 277  * Inode flags
 278  */
 279 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 280 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 281 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 282 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 283 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 284 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 285 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 286 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 287 /* Reserved for compression usage... */
 288 #define EXT2_DIRTY_FL                   0x00000100
 289 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 290 #define EXT2_NOCOMPR_FL                 0x00000400 /* Access raw compressed data */
 291 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 292 /* End compression flags --- maybe not all used */
 293 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 294 #define EXT2_INDEX_FL                   0x00001000 /* hash-indexed directory */
 295 #define EXT2_IMAGIC_FL                  0x00002000
 296 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 297 #define EXT2_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 298 #define EXT2_DIRSYNC_FL                 0x00010000 /* Synchronous directory modifications */
 299 #define EXT2_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 300 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 301 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 302 #define EXT4_EA_INODE_FL                0x00200000 /* Inode used for large EA */
 303 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
 304 #define EXT4_SNAPFILE_FL                0x01000000  /* Inode is a snapshot */
 305 #define EXT4_SNAPFILE_DELETED_FL        0x04000000  /* Snapshot is being deleted */
 306 #define EXT4_SNAPFILE_SHRUNK_FL         0x08000000  /* Snapshot shrink has completed */
 307 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 308
 309 #define EXT2_FL_USER_VISIBLE            0x004BDFFF /* User visible flags */
 310 #define EXT2_FL_USER_MODIFIABLE         0x004B80FF /* User modifiable flags */
 311
 312 /*
 313  * ioctl commands
 314  */
 315
 316 /* Used for online resize */
 317 struct ext2_new_group_input {
 318         __u32 group;            /* Group number for this data */
 319         __u32 block_bitmap;     /* Absolute block number of block bitmap */
 320         __u32 inode_bitmap;     /* Absolute block number of inode bitmap */
 321         __u32 inode_table;      /* Absolute block number of inode table start */
 322         __u32 blocks_count;     /* Total number of blocks in this group */
 323         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 324         __u16 unused;           /* Number of reserved GDT blocks in group */
 325 };
 326
 327 struct ext4_new_group_input {
 328         __u32 group;            /* Group number for this data */
 329         __u64 block_bitmap;     /* Absolute block number of block bitmap */
 330         __u64 inode_bitmap;     /* Absolute block number of inode bitmap */
 331         __u64 inode_table;      /* Absolute block number of inode table start */
 332         __u32 blocks_count;     /* Total number of blocks in this group */
 333         __u16 reserved_blocks;  /* Number of reserved blocks in this group */
 334         __u16 unused;
 335 };
 336
 337 #ifdef __GNU__                  /* Needed for the Hurd */
 338 #define _IOT_ext2_new_group_input _IOT (_IOTS(__u32), 5, _IOTS(__u16), 2, 0, 0)
 339 #endif
 340
 341 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 342 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 343 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 344 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 345 #define EXT2_IOC_GETVERSION_NEW         _IOR('f', 3, long)
 346 #define EXT2_IOC_SETVERSION_NEW         _IOW('f', 4, long)
 347 #define EXT2_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)
 348 #define EXT2_IOC_GROUP_ADD              _IOW('f', 8,struct ext2_new_group_input)
 349 #define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)
 350 #define EXT4_IOC_RESIZE_FS              _IOW('f', 16, __u64)
 351
 352 /*
 353  * Structure of an inode on the disk
 354  */
 355 struct ext2_inode {
 356         __u16   i_mode;         /* File mode */
 357         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 358         __u32   i_size;         /* Size in bytes */
 359         __u32   i_atime;        /* Access time */
 360         __u32   i_ctime;        /* Inode change time */
 361         __u32   i_mtime;        /* Modification time */
 362         __u32   i_dtime;        /* Deletion Time */
 363         __u16   i_gid;          /* Low 16 bits of Group Id */
 364         __u16   i_links_count;  /* Links count */
 365         __u32   i_blocks;       /* Blocks count */
 366         __u32   i_flags;        /* File flags */
 367         union {
 368                 struct {
 369                         __u32   l_i_version; /* was l_i_reserved1 */
 370                 } linux1;
 371                 struct {
 372                         __u32  h_i_translator;
 373                 } hurd1;
 374         } osd1;                         /* OS dependent 1 */
 375         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 376         __u32   i_generation;   /* File version (for NFS) */
 377         __u32   i_file_acl;     /* File ACL */
 378         __u32   i_size_high;    /* Formerly i_dir_acl, directory ACL */
 379         __u32   i_faddr;        /* Fragment address */
 380         union {
 381                 struct {
 382                         __u16   l_i_blocks_hi;
 383                         __u16   l_i_file_acl_high;
 384                         __u16   l_i_uid_high;   /* these 2 fields    */
 385                         __u16   l_i_gid_high;   /* were reserved2[0] */
 386                         __u16   l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
 387                         __u16   l_i_reserved;
 388                 } linux2;
 389                 struct {
 390                         __u8    h_i_frag;       /* Fragment number */
 391                         __u8    h_i_fsize;      /* Fragment size */
 392                         __u16   h_i_mode_high;
 393                         __u16   h_i_uid_high;
 394                         __u16   h_i_gid_high;
 395                         __u32   h_i_author;
 396                 } hurd2;
 397         } osd2;                         /* OS dependent 2 */
 398 };
 399
 400 /*
 401  * Permanent part of an large inode on the disk
 402  */
 403 struct ext2_inode_large {
 404         __u16   i_mode;         /* File mode */
 405         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 406         __u32   i_size;         /* Size in bytes */
 407         __u32   i_atime;        /* Access time */
 408         __u32   i_ctime;        /* Inode Change time */
 409         __u32   i_mtime;        /* Modification time */
 410         __u32   i_dtime;        /* Deletion Time */
 411         __u16   i_gid;          /* Low 16 bits of Group Id */
 412         __u16   i_links_count;  /* Links count */
 413         __u32   i_blocks;       /* Blocks count */
 414         __u32   i_flags;        /* File flags */
 415         union {
 416                 struct {
 417                         __u32   l_i_version; /* was l_i_reserved1 */
 418                 } linux1;
 419                 struct {
 420                         __u32  h_i_translator;
 421                 } hurd1;
 422         } osd1;                         /* OS dependent 1 */
 423         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 424         __u32   i_generation;   /* File version (for NFS) */
 425         __u32   i_file_acl;     /* File ACL */
 426         __u32   i_size_high;    /* Formerly i_dir_acl, directory ACL */
 427         __u32   i_faddr;        /* Fragment address */
 428         union {
 429                 struct {
 430                         __u16   l_i_blocks_hi;
 431                         __u16   l_i_file_acl_high;
 432                         __u16   l_i_uid_high;   /* these 2 fields    */
 433                         __u16   l_i_gid_high;   /* were reserved2[0] */
 434                         __u16   l_i_checksum_lo; /* crc32c(uuid+inum+inode) */
 435                         __u16   l_i_reserved;
 436                 } linux2;
 437                 struct {
 438                         __u8    h_i_frag;       /* Fragment number */
 439                         __u8    h_i_fsize;      /* Fragment size */
 440                         __u16   h_i_mode_high;
 441                         __u16   h_i_uid_high;
 442                         __u16   h_i_gid_high;
 443                         __u32   h_i_author;
 444                 } hurd2;
 445         } osd2;                         /* OS dependent 2 */
 446         __u16   i_extra_isize;
 447         __u16   i_checksum_hi;  /* crc32c(uuid+inum+inode) */
 448         __u32   i_ctime_extra;  /* extra Change time (nsec << 2 | epoch) */
 449         __u32   i_mtime_extra;  /* extra Modification time (nsec << 2 | epoch) */
 450         __u32   i_atime_extra;  /* extra Access time (nsec << 2 | epoch) */
 451         __u32   i_crtime;       /* File creation time */
 452         __u32   i_crtime_extra; /* extra File creation time (nsec << 2 | epoch)*/
 453         __u32   i_version_hi;   /* high 32 bits for 64-bit version */
 454 };
 455
 456 #define i_dir_acl       i_size_high
 457
 458 #if defined(__KERNEL__) || defined(__linux__)
 459 #define i_reserved1     osd1.linux1.l_i_reserved1
 460 #define i_frag          osd2.linux2.l_i_frag
 461 #define i_fsize         osd2.linux2.l_i_fsize
 462 #define i_uid_low       i_uid
 463 #define i_gid_low       i_gid
 464 #define i_uid_high      osd2.linux2.l_i_uid_high
 465 #define i_gid_high      osd2.linux2.l_i_gid_high
 466 #else
 467 #if defined(__GNU__)
 468
 469 #define i_translator    osd1.hurd1.h_i_translator
 470 #define i_frag          osd2.hurd2.h_i_frag;
 471 #define i_fsize         osd2.hurd2.h_i_fsize;
 472 #define i_uid_high      osd2.hurd2.h_i_uid_high
 473 #define i_gid_high      osd2.hurd2.h_i_gid_high
 474 #define i_author        osd2.hurd2.h_i_author
 475
 476 #endif  /* __GNU__ */
 477 #endif  /* defined(__KERNEL__) || defined(__linux__) */
 478
 479 #define inode_uid(inode)        ((inode).i_uid | (inode).osd2.linux2.l_i_uid_high << 16)
 480 #define inode_gid(inode)        ((inode).i_gid | (inode).osd2.linux2.l_i_gid_high << 16)
 481 #define ext2fs_set_i_uid_high(inode,x) ((inode).osd2.linux2.l_i_uid_high = (x))
 482 #define ext2fs_set_i_gid_high(inode,x) ((inode).osd2.linux2.l_i_gid_high = (x))
 483
 484 /*
 485  * File system states
 486  */
 487 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 488 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 489 #define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */
 490
 491 /*
 492  * Misc. filesystem flags
 493  */
 494 #define EXT2_FLAGS_SIGNED_HASH          0x0001  /* Signed dirhash in use */
 495 #define EXT2_FLAGS_UNSIGNED_HASH        0x0002  /* Unsigned dirhash in use */
 496 #define EXT2_FLAGS_TEST_FILESYS         0x0004  /* OK for use on development code */
 497 #define EXT2_FLAGS_IS_SNAPSHOT          0x0010  /* This is a snapshot image */
 498 #define EXT2_FLAGS_FIX_SNAPSHOT         0x0020  /* Snapshot inodes corrupted */
 499 #define EXT2_FLAGS_FIX_EXCLUDE          0x0040  /* Exclude bitmaps corrupted */
 500
 501 /*
 502  * Mount flags
 503  */
 504 #define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 505 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 506 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 507 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 508 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 509 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 510 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 511 #define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 512
 513 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 514 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 515 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 516                                          EXT2_MOUNT_##opt)
 517 /*
 518  * Maximal mount counts between two filesystem checks
 519  */
 520 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 521 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 522
 523 /*
 524  * Behaviour when detecting errors
 525  */
 526 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 527 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 528 #define EXT2_ERRORS_PANIC               3       /* Panic */
 529 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 530
 531 #if (__GNUC__ >= 4)
 532 #define ext4_offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
 533 #else
 534 #define ext4_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 535 #endif
 536
 537 /*
 538  * Structure of the super block
 539  */
 540 struct ext2_super_block {
 541         __u32   s_inodes_count;         /* Inodes count */
 542         __u32   s_blocks_count;         /* Blocks count */
 543         __u32   s_r_blocks_count;       /* Reserved blocks count */
 544         __u32   s_free_blocks_count;    /* Free blocks count */
 545         __u32   s_free_inodes_count;    /* Free inodes count */
 546         __u32   s_first_data_block;     /* First Data Block */
 547         __u32   s_log_block_size;       /* Block size */
 548         __u32   s_log_cluster_size;     /* Allocation cluster size */
 549         __u32   s_blocks_per_group;     /* # Blocks per group */
 550         __u32   s_clusters_per_group;   /* # Fragments per group */
 551         __u32   s_inodes_per_group;     /* # Inodes per group */
 552         __u32   s_mtime;                /* Mount time */
 553         __u32   s_wtime;                /* Write time */
 554         __u16   s_mnt_count;            /* Mount count */
 555         __s16   s_max_mnt_count;        /* Maximal mount count */
 556         __u16   s_magic;                /* Magic signature */
 557         __u16   s_state;                /* File system state */
 558         __u16   s_errors;               /* Behaviour when detecting errors */
 559         __u16   s_minor_rev_level;      /* minor revision level */
 560         __u32   s_lastcheck;            /* time of last check */
 561         __u32   s_checkinterval;        /* max. time between checks */
 562         __u32   s_creator_os;           /* OS */
 563         __u32   s_rev_level;            /* Revision level */
 564         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 565         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 566         /*
 567          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 568          *
 569          * Note: the difference between the compatible feature set and
 570          * the incompatible feature set is that if there is a bit set
 571          * in the incompatible feature set that the kernel doesn't
 572          * know about, it should refuse to mount the filesystem.
 573          *
 574          * e2fsck's requirements are more strict; if it doesn't know
 575          * about a feature in either the compatible or incompatible
 576          * feature set, it must abort and not try to meddle with
 577          * things it doesn't understand...
 578          */
 579         __u32   s_first_ino;            /* First non-reserved inode */
 580         __u16   s_inode_size;           /* size of inode structure */
 581         __u16   s_block_group_nr;       /* block group # of this superblock */
 582         __u32   s_feature_compat;       /* compatible feature set */
 583         __u32   s_feature_incompat;     /* incompatible feature set */
 584         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 585         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 586         char    s_volume_name[16];      /* volume name */
 587         char    s_last_mounted[64];     /* directory where last mounted */
 588         __u32   s_algorithm_usage_bitmap; /* For compression */
 589         /*
 590          * Performance hints.  Directory preallocation should only
 591          * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 592          */
 593         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 594         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 595         __u16   s_reserved_gdt_blocks;  /* Per group table for online growth */
 596         /*
 597          * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
 598          */
 599         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 600         __u32   s_journal_inum;         /* inode number of journal file */
 601         __u32   s_journal_dev;          /* device number of journal file */
 602         __u32   s_last_orphan;          /* start of list of inodes to delete */
 603         __u32   s_hash_seed[4];         /* HTREE hash seed */
 604         __u8    s_def_hash_version;     /* Default hash version to use */
 605         __u8    s_jnl_backup_type;      /* Default type of journal backup */
 606         __u16   s_desc_size;            /* Group desc. size: INCOMPAT_64BIT */
 607         __u32   s_default_mount_opts;
 608         __u32   s_first_meta_bg;        /* First metablock group */
 609         __u32   s_mkfs_time;            /* When the filesystem was created */
 610         __u32   s_jnl_blocks[17];       /* Backup of the journal inode */
 611         __u32   s_blocks_count_hi;      /* Blocks count high 32bits */
 612         __u32   s_r_blocks_count_hi;    /* Reserved blocks count high 32 bits*/
 613         __u32   s_free_blocks_hi;       /* Free blocks count */
 614         __u16   s_min_extra_isize;      /* All inodes have at least # bytes */
 615         __u16   s_want_extra_isize;     /* New inodes should reserve # bytes */
 616         __u32   s_flags;                /* Miscellaneous flags */
 617         __u16   s_raid_stride;          /* RAID stride */
 618         __u16   s_mmp_update_interval;  /* # seconds to wait in MMP checking */
 619         __u64   s_mmp_block;            /* Block for multi-mount protection */
 620         __u32   s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 621         __u8    s_log_groups_per_flex;  /* FLEX_BG group size */
 622         __u8    s_reserved_char_pad;
 623         __u16   s_reserved_pad;         /* Padding to next 32bits */
 624         __u64   s_kbytes_written;       /* nr of lifetime kilobytes written */
 625         __u32   s_snapshot_inum;        /* Inode number of active snapshot */
 626         __u32   s_snapshot_id;          /* sequential ID of active snapshot */
 627         __u64   s_snapshot_r_blocks_count; /* reserved blocks for active
 628                                               snapshot's future use */
 629         __u32   s_snapshot_list;        /* inode number of the head of the on-disk snapshot list */
 630 #define EXT4_S_ERR_START ext4_offsetof(struct ext2_super_block, s_error_count)
 631         __u32   s_error_count;          /* number of fs errors */
 632         __u32   s_first_error_time;     /* first time an error happened */
 633         __u32   s_first_error_ino;      /* inode involved in first error */
 634         __u64   s_first_error_block;    /* block involved of first error */
 635         __u8    s_first_error_func[32]; /* function where the error happened */
 636         __u32   s_first_error_line;     /* line number where error happened */
 637         __u32   s_last_error_time;      /* most recent time of an error */
 638         __u32   s_last_error_ino;       /* inode involved in last error */
 639         __u32   s_last_error_line;      /* line number where error happened */
 640         __u64   s_last_error_block;     /* block involved of last error */
 641         __u8    s_last_error_func[32];  /* function where the error happened */
 642 #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
 643         __u8    s_mount_opts[64];
 644         __u32   s_usr_quota_inum;       /* inode number of user quota file */
 645         __u32   s_grp_quota_inum;       /* inode number of group quota file */
 646         __u32   s_overhead_blocks;      /* overhead blocks/clusters in fs */
 647         __u32   s_reserved[108];        /* Padding to the end of the block */
 648         __u32   s_checksum;             /* crc32c(superblock) */
 649 };
 650
 651 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
 652
 653 /*
 654  * Codes for operating systems
 655  */
 656 #define EXT2_OS_LINUX           0
 657 #define EXT2_OS_HURD            1
 658 #define EXT2_OBSO_OS_MASIX      2
 659 #define EXT2_OS_FREEBSD         3
 660 #define EXT2_OS_LITES           4
 661
 662 /*
 663  * Revision levels
 664  */
 665 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 666 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 667
 668 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 669 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 670
 671 #define EXT2_GOOD_OLD_INODE_SIZE 128
 672
 673 /*
 674  * Journal inode backup types
 675  */
 676 #define EXT3_JNL_BACKUP_BLOCKS  1
 677
 678 /*
 679  * Feature set definitions
 680  */
 681
 682 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 683         ( EXT2_SB(sb)->s_feature_compat & (mask) )
 684 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 685         ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 686 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 687         ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 688
 689 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 690 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 691 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 692 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 693 #define EXT2_FEATURE_COMPAT_RESIZE_INODE        0x0010
 694 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 695 #define EXT2_FEATURE_COMPAT_LAZY_BG             0x0040
 696 /* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE    0x0080 not used, legacy */
 697 #define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP      0x0100
 698
 699
 700 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 701 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 702 /* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR     0x0004 not used */
 703 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 704 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 705 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 706 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 707 #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT     0x0080
 708 #define EXT4_FEATURE_RO_COMPAT_QUOTA            0x0100
 709 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC         0x0200
 710 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM    0x0400
 711 #define EXT4_FEATURE_RO_COMPAT_REPLICA          0x0800
 712
 713 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 714 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 715 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 716 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 717 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 718 #define EXT3_FEATURE_INCOMPAT_EXTENTS           0x0040
 719 #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 720 #define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 721 #define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 722 #define EXT4_FEATURE_INCOMPAT_EA_INODE          0x0400
 723 #define EXT4_FEATURE_INCOMPAT_DIRDATA           0x1000
 724
 725 #define EXT2_FEATURE_COMPAT_SUPP        0
 726 #define EXT2_FEATURE_INCOMPAT_SUPP    (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 727                                        EXT4_FEATURE_INCOMPAT_MMP)
 728 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 729                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 730                                          EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
 731                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 732
 733 /*
 734  * Default values for user and/or group using reserved blocks
 735  */
 736 #define EXT2_DEF_RESUID         0
 737 #define EXT2_DEF_RESGID         0
 738
 739 /*
 740  * Default mount options
 741  */
 742 #define EXT2_DEFM_DEBUG         0x0001
 743 #define EXT2_DEFM_BSDGROUPS     0x0002
 744 #define EXT2_DEFM_XATTR_USER    0x0004
 745 #define EXT2_DEFM_ACL           0x0008
 746 #define EXT2_DEFM_UID16         0x0010
 747 #define EXT3_DEFM_JMODE         0x0060
 748 #define EXT3_DEFM_JMODE_DATA    0x0020
 749 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 750 #define EXT3_DEFM_JMODE_WBACK   0x0060
 751 #define EXT4_DEFM_NOBARRIER     0x0100
 752 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
 753 #define EXT4_DEFM_DISCARD       0x0400
 754 #define EXT4_DEFM_NODELALLOC    0x0800
 755
 756 /*
 757  * Structure of a directory entry
 758  */
 759 #define EXT2_NAME_LEN 255
 760
 761 struct ext2_dir_entry {
 762         __u32   inode;                  /* Inode number */
 763         __u16   rec_len;                /* Directory entry length */
 764         __u16   name_len;               /* Name length */
 765         char    name[EXT2_NAME_LEN];    /* File name */
 766 };
 767
 768 /*
 769  * The new version of the directory entry.  Since EXT2 structures are
 770  * stored in intel byte order, and the name_len field could never be
 771  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 772  * file_type field.
 773  */
 774 struct ext2_dir_entry_2 {
 775         __u32   inode;                  /* Inode number */
 776         __u16   rec_len;                /* Directory entry length */
 777         __u8    name_len;               /* Name length */
 778         __u8    file_type;
 779         char    name[EXT2_NAME_LEN];    /* File name */
 780 };
 781
 782 /*
 783  * Ext2 directory file types.  Only the low 3 bits are used.  The
 784  * other bits are reserved for now.
 785  */
 786 #define EXT2_FT_UNKNOWN         0
 787 #define EXT2_FT_REG_FILE        1
 788 #define EXT2_FT_DIR             2
 789 #define EXT2_FT_CHRDEV          3
 790 #define EXT2_FT_BLKDEV          4
 791 #define EXT2_FT_FIFO            5
 792 #define EXT2_FT_SOCK            6
 793 #define EXT2_FT_SYMLINK         7
 794
 795 #define EXT2_FT_MAX             8
 796
 797 /*
 798  * EXT2_DIR_PAD defines the directory entries boundaries
 799  *
 800  * NOTE: It must be a multiple of 4
 801  */
 802 #define EXT2_DIR_PAD                    4
 803 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 804 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 805                                          ~EXT2_DIR_ROUND)
 806
 807 /*
 808  * This structure is used for multiple mount protection. It is written
 809  * into the block number saved in the s_mmp_block field in the superblock.
 810  * Programs that check MMP should assume that if SEQ_FSCK (or any unknown
 811  * code above SEQ_MAX) is present then it is NOT safe to use the filesystem,
 812  * regardless of how old the timestamp is.
 813  *
 814  * The timestamp in the MMP structure will be updated by e2fsck at some
 815  * arbitary intervals (start of passes, after every few groups of inodes
 816  * in pass1 and pass1b).  There is no guarantee that e2fsck is updating
 817  * the MMP block in a timely manner, and the updates it does are purely
 818  * for the convenience of the sysadmin and not for automatic validation.
 819  *
 820  * Note: Only the mmp_seq value is used to determine whether the MMP block
 821  *      is being updated.  The mmp_time, mmp_nodename, and mmp_bdevname
 822  *      fields are only for informational purposes for the administrator,
 823  *      due to clock skew between nodes and hostname HA service takeover.
 824  */
 825 #define EXT4_MMP_MAGIC     0x004D4D50U /* ASCII for MMP */
 826 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
 827 #define EXT4_MMP_SEQ_FSCK  0xE24D4D50U /* mmp_seq value when being fscked */
 828 #define EXT4_MMP_SEQ_MAX   0xE24D4D4FU /* maximum valid mmp_seq value */
 829
 830 struct mmp_struct {
 831         __u32   mmp_magic;              /* Magic number for MMP */
 832         __u32   mmp_seq;                /* Sequence no. updated periodically */
 833         __u64   mmp_time;               /* Time last updated */
 834         char    mmp_nodename[64];       /* Node which last updated MMP block */
 835         char    mmp_bdevname[32];       /* Bdev which last updated MMP block */
 836         __u16   mmp_check_interval;     /* Changed mmp_check_interval */
 837         __u16   mmp_pad1;
 838         __u32   mmp_pad2[227];
 839 };
 840
 841 /*
 842  * Default interval for MMP update in seconds.
 843  */
 844 #define EXT4_MMP_UPDATE_INTERVAL        5
 845
 846 /*
 847  * Maximum interval for MMP update in seconds.
 848  */
 849 #define EXT4_MMP_MAX_UPDATE_INTERVAL    300
 850
 851 /*
 852  * Minimum interval for MMP checking in seconds.
 853  */
 854 #define EXT4_MMP_MIN_CHECK_INTERVAL     5
 855
 856 #endif  /* _EXT2FS_EXT2_FS_H */