ext4.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 _EXT4_H
  13 #define _EXT4_H
  14
  15 #include <sys/types.h>
  16
  17 #undef EXT4FS_DEBUG
  18
  19 #ifdef EXT4FS_DEBUG
  20 #define ext4_debug(f, a...)   do {   printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",   __FILE__, __LINE__, __func__);   printk(KERN_DEBUG f, ## a);   } while (0)
  21 #else
  22 #define ext4_debug(f, a...) do {} while (0)
  23 #endif
  24
  25 #define EXT4_ERROR_INODE(inode, fmt, a...)   ext4_error_inode(__func__, (inode), (fmt), ## a);
  26
  27 #define EXT4_ERROR_FILE(file, fmt, a...)   ext4_error_file(__func__, (file), (fmt), ## a);
  28
  29 typedef int ext4_grpblk_t;
  30
  31 typedef unsigned long long ext4_fsblk_t;
  32
  33 typedef __u32 ext4_lblk_t;
  34
  35 typedef unsigned int ext4_group_t;
  36
  37 #define EXT4_MB_HINT_MERGE 0x0001
  38
  39 #define EXT4_MB_HINT_RESERVED 0x0002
  40
  41 #define EXT4_MB_HINT_METADATA 0x0004
  42
  43 #define EXT4_MB_HINT_FIRST 0x0008
  44
  45 #define EXT4_MB_HINT_BEST 0x0010
  46
  47 #define EXT4_MB_HINT_DATA 0x0020
  48
  49 #define EXT4_MB_HINT_NOPREALLOC 0x0040
  50
  51 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
  52
  53 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
  54
  55 #define EXT4_MB_HINT_TRY_GOAL 0x0200
  56
  57 #define EXT4_MB_DELALLOC_RESERVED 0x0400
  58
  59 #define EXT4_MB_STREAM_ALLOC 0x0800
  60
  61 struct ext4_allocation_request {
  62
  63  struct inode *inode;
  64
  65  unsigned int len;
  66
  67  ext4_lblk_t logical;
  68
  69  ext4_lblk_t lleft;
  70
  71  ext4_lblk_t lright;
  72
  73  ext4_fsblk_t goal;
  74
  75  ext4_fsblk_t pleft;
  76
  77  ext4_fsblk_t pright;
  78
  79  unsigned int flags;
  80 };
  81
  82 #define EXT4_BAD_INO 1
  83 #define EXT4_ROOT_INO 2
  84 #define EXT4_BOOT_LOADER_INO 5
  85 #define EXT4_UNDEL_DIR_INO 6
  86 #define EXT4_RESIZE_INO 7
  87 #define EXT4_JOURNAL_INO 8
  88
  89 #define EXT4_GOOD_OLD_FIRST_INO 11
  90
  91 #define EXT4_LINK_MAX 65000
  92
  93 #define EXT4_MIN_BLOCK_SIZE 1024
  94 #define EXT4_MAX_BLOCK_SIZE 65536
  95 #define EXT4_MIN_BLOCK_LOG_SIZE 10
  96 #define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  97 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
  98 #define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
  99 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ?   EXT4_GOOD_OLD_INODE_SIZE :   (s)->s_inode_size)
 100 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ?   EXT4_GOOD_OLD_FIRST_INO :   (s)->s_first_ino)
 101 #define EXT4_BLOCK_ALIGN(size, blkbits) EXT4_ALIGN((size), (1 << (blkbits)))
 102
 103 struct ext4_group_desc
 104 {
 105  __le32 bg_block_bitmap_lo;
 106  __le32 bg_inode_bitmap_lo;
 107  __le32 bg_inode_table_lo;
 108  __le16 bg_free_blocks_count_lo;
 109  __le16 bg_free_inodes_count_lo;
 110  __le16 bg_used_dirs_count_lo;
 111  __le16 bg_flags;
 112  __u32 bg_reserved[2];
 113  __le16 bg_itable_unused_lo;
 114  __le16 bg_checksum;
 115  __le32 bg_block_bitmap_hi;
 116  __le32 bg_inode_bitmap_hi;
 117  __le32 bg_inode_table_hi;
 118  __le16 bg_free_blocks_count_hi;
 119  __le16 bg_free_inodes_count_hi;
 120  __le16 bg_used_dirs_count_hi;
 121  __le16 bg_itable_unused_hi;
 122  __u32 bg_reserved2[3];
 123 };
 124
 125 #define EXT4_BG_INODE_UNINIT 0x0001
 126 #define EXT4_BG_BLOCK_UNINIT 0x0002
 127 #define EXT4_BG_INODE_ZEROED 0x0004
 128
 129 #define EXT4_MIN_DESC_SIZE 32
 130 #define EXT4_MIN_DESC_SIZE_64BIT 64
 131 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
 132 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
 133 #define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
 134 #define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
 135 #define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
 136
 137 #define EXT4_NDIR_BLOCKS 12
 138 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
 139 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
 140 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
 141 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
 142
 143 #define EXT4_SECRM_FL 0x00000001
 144 #define EXT4_UNRM_FL 0x00000002
 145 #define EXT4_COMPR_FL 0x00000004
 146 #define EXT4_SYNC_FL 0x00000008
 147 #define EXT4_IMMUTABLE_FL 0x00000010
 148 #define EXT4_APPEND_FL 0x00000020
 149 #define EXT4_NODUMP_FL 0x00000040
 150 #define EXT4_NOATIME_FL 0x00000080
 151
 152 #define EXT4_DIRTY_FL 0x00000100
 153 #define EXT4_COMPRBLK_FL 0x00000200
 154 #define EXT4_NOCOMPR_FL 0x00000400
 155 #define EXT4_ECOMPR_FL 0x00000800
 156
 157 #define EXT4_INDEX_FL 0x00001000
 158 #define EXT4_IMAGIC_FL 0x00002000
 159 #define EXT4_JOURNAL_DATA_FL 0x00004000
 160 #define EXT4_NOTAIL_FL 0x00008000
 161 #define EXT4_DIRSYNC_FL 0x00010000
 162 #define EXT4_TOPDIR_FL 0x00020000
 163 #define EXT4_HUGE_FILE_FL 0x00040000
 164 #define EXT4_EXTENTS_FL 0x00080000
 165 #define EXT4_EA_INODE_FL 0x00200000
 166 #define EXT4_EOFBLOCKS_FL 0x00400000
 167 #define EXT4_RESERVED_FL 0x80000000
 168
 169 #define EXT4_FL_USER_VISIBLE 0x004BDFFF
 170 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF
 171
 172 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |  EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |  EXT4_NODUMP_FL | EXT4_NOATIME_FL |  EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |  EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
 173
 174 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
 175
 176 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 177
 178 struct ext4_new_group_data {
 179  __u32 group;
 180  __u64 block_bitmap;
 181  __u64 inode_bitmap;
 182  __u64 inode_table;
 183  __u32 blocks_count;
 184  __u16 reserved_blocks;
 185  __u16 unused;
 186  __u32 free_blocks_count;
 187 };
 188
 189 #define EXT4_GET_BLOCKS_CREATE 0x0001
 190
 191 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
 192 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|  EXT4_GET_BLOCKS_CREATE)
 193
 194 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
 195
 196 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
 197 #define EXT4_GET_BLOCKS_CONVERT 0x0010
 198 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|  EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 199
 200 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|  EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
 201
 202 #define EXT4_FREE_BLOCKS_METADATA 0x0001
 203 #define EXT4_FREE_BLOCKS_FORGET 0x0002
 204 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
 205
 206 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
 207 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
 208 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
 209 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
 210 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
 211 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
 212 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
 213 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
 214 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
 215 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
 216 #define EXT4_IOC_MIGRATE _IO('f', 9)
 217
 218 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
 219 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
 220
 221 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
 222 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
 223 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
 224 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
 225 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
 226 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
 227 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
 228 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
 229 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
 230
 231 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
 232
 233 struct ext4_inode {
 234  __le16 i_mode;
 235  __le16 i_uid;
 236  __le32 i_size_lo;
 237  __le32 i_atime;
 238  __le32 i_ctime;
 239  __le32 i_mtime;
 240  __le32 i_dtime;
 241  __le16 i_gid;
 242  __le16 i_links_count;
 243  __le32 i_blocks_lo;
 244  __le32 i_flags;
 245  union {
 246  struct {
 247  __le32 l_i_version;
 248  } linux1;
 249  struct {
 250  __u32 h_i_translator;
 251  } hurd1;
 252  struct {
 253  __u32 m_i_reserved1;
 254  } masix1;
 255  } osd1;
 256  __le32 i_block[EXT4_N_BLOCKS];
 257  __le32 i_generation;
 258  __le32 i_file_acl_lo;
 259  __le32 i_size_high;
 260  __le32 i_obso_faddr;
 261  union {
 262  struct {
 263  __le16 l_i_blocks_high;
 264  __le16 l_i_file_acl_high;
 265  __le16 l_i_uid_high;
 266  __le16 l_i_gid_high;
 267  __u32 l_i_reserved2;
 268  } linux2;
 269  struct {
 270  __le16 h_i_reserved1;
 271  __u16 h_i_mode_high;
 272  __u16 h_i_uid_high;
 273  __u16 h_i_gid_high;
 274  __u32 h_i_author;
 275  } hurd2;
 276  struct {
 277  __le16 h_i_reserved1;
 278  __le16 m_i_file_acl_high;
 279  __u32 m_i_reserved2[2];
 280  } masix2;
 281  } osd2;
 282  __le16 i_extra_isize;
 283  __le16 i_pad1;
 284  __le32 i_ctime_extra;
 285  __le32 i_mtime_extra;
 286  __le32 i_atime_extra;
 287  __le32 i_crtime;
 288  __le32 i_crtime_extra;
 289  __le32 i_version_hi;
 290 };
 291
 292 struct move_extent {
 293  __u32 reserved;
 294  __u32 donor_fd;
 295  __u64 orig_start;
 296  __u64 donor_start;
 297  __u64 len;
 298  __u64 moved_len;
 299 };
 300
 301 #define EXT4_EPOCH_BITS 2
 302 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
 303 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
 304
 305 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   ((offsetof(typeof(*ext4_inode), field) +   sizeof((ext4_inode)->field))   <= (EXT4_GOOD_OLD_INODE_SIZE +   (einode)->i_extra_isize))
 306 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)  do {   (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);   if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))   (raw_inode)->xtime ## _extra =   ext4_encode_extra_time(&(inode)->xtime);  } while (0)
 307 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)  do {   if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))   (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);   if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))   (raw_inode)->xtime ## _extra =   ext4_encode_extra_time(&(einode)->xtime);  } while (0)
 308 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)  do {   (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);   if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))   ext4_decode_extra_time(&(inode)->xtime,   raw_inode->xtime ## _extra);  } while (0)
 309 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)  do {   if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))   (einode)->xtime.tv_sec =   (signed)le32_to_cpu((raw_inode)->xtime);   if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))   ext4_decode_extra_time(&(einode)->xtime,   raw_inode->xtime ## _extra);  } while (0)
 310 #define i_disk_version osd1.linux1.l_i_version
 311
 312 #define i_reserved1 osd1.linux1.l_i_reserved1
 313 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
 314 #define i_blocks_high osd2.linux2.l_i_blocks_high
 315 #define i_uid_low i_uid
 316 #define i_gid_low i_gid
 317 #define i_uid_high osd2.linux2.l_i_uid_high
 318 #define i_gid_high osd2.linux2.l_i_gid_high
 319 #define i_reserved2 osd2.linux2.l_i_reserved2
 320
 321 #define EXT4_VALID_FS 0x0001
 322 #define EXT4_ERROR_FS 0x0002
 323 #define EXT4_ORPHAN_FS 0x0004
 324
 325 #define EXT2_FLAGS_SIGNED_HASH 0x0001
 326 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002
 327 #define EXT2_FLAGS_TEST_FILESYS 0x0004
 328
 329 #define EXT4_MOUNT_OLDALLOC 0x00002
 330 #define EXT4_MOUNT_GRPID 0x00004
 331 #define EXT4_MOUNT_DEBUG 0x00008
 332 #define EXT4_MOUNT_ERRORS_CONT 0x00010
 333 #define EXT4_MOUNT_ERRORS_RO 0x00020
 334 #define EXT4_MOUNT_ERRORS_PANIC 0x00040
 335 #define EXT4_MOUNT_MINIX_DF 0x00080
 336 #define EXT4_MOUNT_NOLOAD 0x00100
 337 #define EXT4_MOUNT_DATA_FLAGS 0x00C00
 338 #define EXT4_MOUNT_JOURNAL_DATA 0x00400
 339 #define EXT4_MOUNT_ORDERED_DATA 0x00800
 340 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
 341 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
 342 #define EXT4_MOUNT_NO_UID32 0x02000
 343 #define EXT4_MOUNT_XATTR_USER 0x04000
 344 #define EXT4_MOUNT_POSIX_ACL 0x08000
 345 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
 346 #define EXT4_MOUNT_BARRIER 0x20000
 347 #define EXT4_MOUNT_NOBH 0x40000
 348 #define EXT4_MOUNT_QUOTA 0x80000
 349 #define EXT4_MOUNT_USRQUOTA 0x100000
 350 #define EXT4_MOUNT_GRPQUOTA 0x200000
 351 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000
 352 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
 353 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
 354 #define EXT4_MOUNT_I_VERSION 0x2000000
 355 #define EXT4_MOUNT_DELALLOC 0x8000000
 356 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
 357 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
 358 #define EXT4_MOUNT_DISCARD 0x40000000
 359
 360 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
 361 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
 362 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt &   EXT4_MOUNT_##opt)
 363
 364 #define ext4_set_bit ext2_set_bit
 365 #define ext4_set_bit_atomic ext2_set_bit_atomic
 366 #define ext4_clear_bit ext2_clear_bit
 367 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
 368 #define ext4_test_bit ext2_test_bit
 369 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
 370 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
 371 #define ext4_find_next_bit ext2_find_next_bit
 372
 373 #define EXT4_DFL_MAX_MNT_COUNT 20
 374 #define EXT4_DFL_CHECKINTERVAL 0
 375
 376 #define EXT4_ERRORS_CONTINUE 1
 377 #define EXT4_ERRORS_RO 2
 378 #define EXT4_ERRORS_PANIC 3
 379 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
 380
 381 struct ext4_super_block {
 382   __le32 s_inodes_count;
 383  __le32 s_blocks_count_lo;
 384  __le32 s_r_blocks_count_lo;
 385  __le32 s_free_blocks_count_lo;
 386   __le32 s_free_inodes_count;
 387  __le32 s_first_data_block;
 388  __le32 s_log_block_size;
 389  __le32 s_obso_log_frag_size;
 390   __le32 s_blocks_per_group;
 391  __le32 s_obso_frags_per_group;
 392  __le32 s_inodes_per_group;
 393  __le32 s_mtime;
 394   __le32 s_wtime;
 395  __le16 s_mnt_count;
 396  __le16 s_max_mnt_count;
 397  __le16 s_magic;
 398  __le16 s_state;
 399  __le16 s_errors;
 400  __le16 s_minor_rev_level;
 401   __le32 s_lastcheck;
 402  __le32 s_checkinterval;
 403  __le32 s_creator_os;
 404  __le32 s_rev_level;
 405   __le16 s_def_resuid;
 406  __le16 s_def_resgid;
 407
 408  __le32 s_first_ino;
 409  __le16 s_inode_size;
 410  __le16 s_block_group_nr;
 411  __le32 s_feature_compat;
 412   __le32 s_feature_incompat;
 413  __le32 s_feature_ro_compat;
 414   __u8 s_uuid[16];
 415   char s_volume_name[16];
 416   char s_last_mounted[64];
 417   __le32 s_algorithm_usage_bitmap;
 418
 419  __u8 s_prealloc_blocks;
 420  __u8 s_prealloc_dir_blocks;
 421  __le16 s_reserved_gdt_blocks;
 422
 423   __u8 s_journal_uuid[16];
 424   __le32 s_journal_inum;
 425  __le32 s_journal_dev;
 426  __le32 s_last_orphan;
 427  __le32 s_hash_seed[4];
 428  __u8 s_def_hash_version;
 429  __u8 s_reserved_char_pad;
 430  __le16 s_desc_size;
 431   __le32 s_default_mount_opts;
 432  __le32 s_first_meta_bg;
 433  __le32 s_mkfs_time;
 434  __le32 s_jnl_blocks[17];
 435
 436   __le32 s_blocks_count_hi;
 437  __le32 s_r_blocks_count_hi;
 438  __le32 s_free_blocks_count_hi;
 439  __le16 s_min_extra_isize;
 440  __le16 s_want_extra_isize;
 441  __le32 s_flags;
 442  __le16 s_raid_stride;
 443  __le16 s_mmp_interval;
 444  __le64 s_mmp_block;
 445  __le32 s_raid_stripe_width;
 446  __u8 s_log_groups_per_flex;
 447  __u8 s_reserved_char_pad2;
 448  __le16 s_reserved_pad;
 449  __le64 s_kbytes_written;
 450  __u32 s_reserved[160];
 451 };
 452
 453 #define EXT4_SB(sb) (sb)
 454
 455 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
 456
 457 #define EXT4_OS_LINUX 0
 458 #define EXT4_OS_HURD 1
 459 #define EXT4_OS_MASIX 2
 460 #define EXT4_OS_FREEBSD 3
 461 #define EXT4_OS_LITES 4
 462
 463 #define EXT4_GOOD_OLD_REV 0
 464 #define EXT4_DYNAMIC_REV 1
 465
 466 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
 467 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
 468
 469 #define EXT4_GOOD_OLD_INODE_SIZE 128
 470
 471 #define EXT4_HAS_COMPAT_FEATURE(sb,mask)   ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
 472 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)   ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
 473 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)   ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
 474 #define EXT4_SET_COMPAT_FEATURE(sb,mask)   EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 475 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)   EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 476 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask)   EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 477 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)   EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 478 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)   EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 479 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)   EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 480
 481 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
 482 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
 483 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
 484 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
 485 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
 486 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
 487
 488 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
 489 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
 490 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
 491 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
 492 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
 493 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
 494 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
 495
 496 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
 497 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
 498 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
 499 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
 500 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
 501 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
 502 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
 503 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
 504 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
 505 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
 506 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
 507
 508 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
 509 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE|   EXT4_FEATURE_INCOMPAT_RECOVER|   EXT4_FEATURE_INCOMPAT_META_BG|   EXT4_FEATURE_INCOMPAT_EXTENTS|   EXT4_FEATURE_INCOMPAT_64BIT|   EXT4_FEATURE_INCOMPAT_FLEX_BG)
 510 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER|   EXT4_FEATURE_RO_COMPAT_LARGE_FILE|   EXT4_FEATURE_RO_COMPAT_GDT_CSUM|   EXT4_FEATURE_RO_COMPAT_DIR_NLINK |   EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE |   EXT4_FEATURE_RO_COMPAT_BTREE_DIR |  EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
 511
 512 #define EXT4_DEF_RESUID 0
 513 #define EXT4_DEF_RESGID 0
 514
 515 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
 516
 517 #define EXT4_DEFM_DEBUG 0x0001
 518 #define EXT4_DEFM_BSDGROUPS 0x0002
 519 #define EXT4_DEFM_XATTR_USER 0x0004
 520 #define EXT4_DEFM_ACL 0x0008
 521 #define EXT4_DEFM_UID16 0x0010
 522 #define EXT4_DEFM_JMODE 0x0060
 523 #define EXT4_DEFM_JMODE_DATA 0x0020
 524 #define EXT4_DEFM_JMODE_ORDERED 0x0040
 525 #define EXT4_DEFM_JMODE_WBACK 0x0060
 526
 527 #define EXT4_DEF_MIN_BATCH_TIME 0
 528 #define EXT4_DEF_MAX_BATCH_TIME 15000
 529
 530 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
 531
 532 #define EXT4_NAME_LEN 255
 533
 534 struct ext4_dir_entry {
 535  __le32 inode;
 536  __le16 rec_len;
 537  __le16 name_len;
 538  char name[EXT4_NAME_LEN];
 539 };
 540
 541 struct ext4_dir_entry_2 {
 542  __le32 inode;
 543  __le16 rec_len;
 544  __u8 name_len;
 545  __u8 file_type;
 546  char name[EXT4_NAME_LEN];
 547 };
 548
 549 #define EXT4_FT_UNKNOWN 0
 550 #define EXT4_FT_REG_FILE 1
 551 #define EXT4_FT_DIR 2
 552 #define EXT4_FT_CHRDEV 3
 553 #define EXT4_FT_BLKDEV 4
 554 #define EXT4_FT_FIFO 5
 555 #define EXT4_FT_SOCK 6
 556 #define EXT4_FT_SYMLINK 7
 557
 558 #define EXT4_FT_MAX 8
 559
 560 #define EXT4_DIR_PAD 4
 561 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
 562 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) &   ~EXT4_DIR_ROUND)
 563 #define EXT4_MAX_REC_LEN ((1<<16)-1)
 564
 565 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb,   EXT4_FEATURE_COMPAT_DIR_INDEX) &&   (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
 566 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
 567 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
 568
 569 #define DX_HASH_LEGACY 0
 570 #define DX_HASH_HALF_MD4 1
 571 #define DX_HASH_TEA 2
 572 #define DX_HASH_LEGACY_UNSIGNED 3
 573 #define DX_HASH_HALF_MD4_UNSIGNED 4
 574 #define DX_HASH_TEA_UNSIGNED 5
 575
 576 #endif
 577