fs/ocfs2/ocfs2_fs.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * ocfs2_fs.h
   5  *
   6  * On-disk structures for OCFS2.
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License, version 2,  as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public
  20  * License along with this program; if not, write to the
  21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22  * Boston, MA 021110-1307, USA.
  23  */
  24
  25 #ifndef _OCFS2_FS_H
  26 #define _OCFS2_FS_H
  27
  28 /* Version */
  29 #define OCFS2_MAJOR_REV_LEVEL           0
  30 #define OCFS2_MINOR_REV_LEVEL           90
  31
  32 /*
  33  * An OCFS2 volume starts this way:
  34  * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
  35  * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
  36  * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
  37  *
  38  * All other structures are found from the superblock information.
  39  *
  40  * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors.  eg, for a
  41  * blocksize of 2K, it is 4096 bytes into disk.
  42  */
  43 #define OCFS2_SUPER_BLOCK_BLKNO         2
  44
  45 /*
  46  * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
  47  * grow if needed.
  48  */
  49 #define OCFS2_MIN_CLUSTERSIZE           4096
  50 #define OCFS2_MAX_CLUSTERSIZE           1048576
  51
  52 /*
  53  * Blocks cannot be bigger than clusters, so the maximum blocksize is the
  54  * minimum cluster size.
  55  */
  56 #define OCFS2_MIN_BLOCKSIZE             512
  57 #define OCFS2_MAX_BLOCKSIZE             OCFS2_MIN_CLUSTERSIZE
  58
  59 /* Filesystem magic number */
  60 #define OCFS2_SUPER_MAGIC               0x7461636f
  61
  62 /* Object signatures */
  63 #define OCFS2_SUPER_BLOCK_SIGNATURE     "OCFSV2"
  64 #define OCFS2_INODE_SIGNATURE           "INODE01"
  65 #define OCFS2_EXTENT_BLOCK_SIGNATURE    "EXBLK01"
  66 #define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"
  67
  68 /* Compatibility flags */
  69 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
  70         ( OCFS2_SB(sb)->s_feature_compat & (mask) )
  71 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)                    \
  72         ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
  73 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)                     \
  74         ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
  75 #define OCFS2_SET_COMPAT_FEATURE(sb,mask)                       \
  76         OCFS2_SB(sb)->s_feature_compat |= (mask)
  77 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)                    \
  78         OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
  79 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)                     \
  80         OCFS2_SB(sb)->s_feature_incompat |= (mask)
  81 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)                     \
  82         OCFS2_SB(sb)->s_feature_compat &= ~(mask)
  83 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                  \
  84         OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
  85 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)                   \
  86         OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
  87
  88 #define OCFS2_FEATURE_COMPAT_SUPP       OCFS2_FEATURE_COMPAT_BACKUP_SB
  89 #define OCFS2_FEATURE_INCOMPAT_SUPP     (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
  90                                          | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
  91                                          | OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
  92 #define OCFS2_FEATURE_RO_COMPAT_SUPP    OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
  93
  94 /*
  95  * Heartbeat-only devices are missing journals and other files.  The
  96  * filesystem driver can't load them, but the library can.  Never put
  97  * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
  98  */
  99 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV    0x0002
 100
 101 /*
 102  * tunefs sets this incompat flag before starting the resize and clears it
 103  * at the end. This flag protects users from inadvertently mounting the fs
 104  * after an aborted run without fsck-ing.
 105  */
 106 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004
 107
 108 /* Used to denote a non-clustered volume */
 109 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT      0x0008
 110
 111 /* Support for sparse allocation in b-trees */
 112 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC     0x0010
 113
 114 /*
 115  * Tunefs sets this incompat flag before starting an operation which
 116  * would require cleanup on abort. This is done to protect users from
 117  * inadvertently mounting the fs after an aborted run without
 118  * fsck-ing.
 119  *
 120  * s_tunefs_flags on the super block describes precisely which
 121  * operations were in progress.
 122  */
 123 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG    0x0020
 124
 125 /* Support for data packed into inode blocks */
 126 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA      0x0040
 127
 128 /*
 129  * backup superblock flag is used to indicate that this volume
 130  * has backup superblocks.
 131  */
 132 #define OCFS2_FEATURE_COMPAT_BACKUP_SB          0x0001
 133
 134 /*
 135  * Unwritten extents support.
 136  */
 137 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN       0x0001
 138
 139 /* The byte offset of the first backup block will be 1G.
 140  * The following will be 4G, 16G, 64G, 256G and 1T.
 141  */
 142 #define OCFS2_BACKUP_SB_START                   1 << 30
 143
 144 /* the max backup superblock nums */
 145 #define OCFS2_MAX_BACKUP_SUPERBLOCKS    6
 146
 147 /*
 148  * Flags on ocfs2_super_block.s_tunefs_flags
 149  */
 150 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT         0x0001  /* Removing slots */
 151
 152 /*
 153  * Flags on ocfs2_dinode.i_flags
 154  */
 155 #define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
 156 #define OCFS2_UNUSED2_FL        (0x00000002)
 157 #define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
 158 #define OCFS2_UNUSED3_FL        (0x00000008)
 159 /* System inode flags */
 160 #define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
 161 #define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
 162 #define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
 163 #define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
 164 #define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
 165 #define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
 166 #define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 167 #define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 168
 169 /*
 170  * Flags on ocfs2_dinode.i_dyn_features
 171  *
 172  * These can change much more often than i_flags. When adding flags,
 173  * keep in mind that i_dyn_features is only 16 bits wide.
 174  */
 175 #define OCFS2_INLINE_DATA_FL    (0x0001)        /* Data stored in inode block */
 176 #define OCFS2_HAS_XATTR_FL      (0x0002)
 177 #define OCFS2_INLINE_XATTR_FL   (0x0004)
 178 #define OCFS2_INDEXED_DIR_FL    (0x0008)
 179
 180 /* Inode attributes, keep in sync with EXT2 */
 181 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
 182 #define OCFS2_UNRM_FL           (0x00000002)    /* Undelete */
 183 #define OCFS2_COMPR_FL          (0x00000004)    /* Compress file */
 184 #define OCFS2_SYNC_FL           (0x00000008)    /* Synchronous updates */
 185 #define OCFS2_IMMUTABLE_FL      (0x00000010)    /* Immutable file */
 186 #define OCFS2_APPEND_FL         (0x00000020)    /* writes to file may only append */
 187 #define OCFS2_NODUMP_FL         (0x00000040)    /* do not dump file */
 188 #define OCFS2_NOATIME_FL        (0x00000080)    /* do not update atime */
 189 #define OCFS2_DIRSYNC_FL        (0x00010000)    /* dirsync behaviour (directories only) */
 190
 191 #define OCFS2_FL_VISIBLE        (0x000100FF)    /* User visible flags */
 192 #define OCFS2_FL_MODIFIABLE     (0x000100FF)    /* User modifiable flags */
 193
 194 /*
 195  * Extent record flags (e_node.leaf.flags)
 196  */
 197 #define OCFS2_EXT_UNWRITTEN     (0x01)  /* Extent is allocated but
 198                                          * unwritten */
 199
 200 /*
 201  * ioctl commands
 202  */
 203 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
 204 #define OCFS2_IOC_SETFLAGS      _IOW('f', 2, long)
 205 #define OCFS2_IOC32_GETFLAGS    _IOR('f', 1, int)
 206 #define OCFS2_IOC32_SETFLAGS    _IOW('f', 2, int)
 207
 208 /*
 209  * Space reservation / allocation / free ioctls and argument structure
 210  * are designed to be compatible with XFS.
 211  *
 212  * ALLOCSP* and FREESP* are not and will never be supported, but are
 213  * included here for completeness.
 214  */
 215 struct ocfs2_space_resv {
 216         __s16           l_type;
 217         __s16           l_whence;
 218         __s64           l_start;
 219         __s64           l_len;          /* len == 0 means until end of file */
 220         __s32           l_sysid;
 221         __u32           l_pid;
 222         __s32           l_pad[4];       /* reserve area                     */
 223 };
 224
 225 #define OCFS2_IOC_ALLOCSP               _IOW ('X', 10, struct ocfs2_space_resv)
 226 #define OCFS2_IOC_FREESP                _IOW ('X', 11, struct ocfs2_space_resv)
 227 #define OCFS2_IOC_RESVSP                _IOW ('X', 40, struct ocfs2_space_resv)
 228 #define OCFS2_IOC_UNRESVSP      _IOW ('X', 41, struct ocfs2_space_resv)
 229 #define OCFS2_IOC_ALLOCSP64     _IOW ('X', 36, struct ocfs2_space_resv)
 230 #define OCFS2_IOC_FREESP64      _IOW ('X', 37, struct ocfs2_space_resv)
 231 #define OCFS2_IOC_RESVSP64      _IOW ('X', 42, struct ocfs2_space_resv)
 232 #define OCFS2_IOC_UNRESVSP64    _IOW ('X', 43, struct ocfs2_space_resv)
 233
 234 /* Used to pass group descriptor data when online resize is done */
 235 struct ocfs2_new_group_input {
 236         __u64 group;            /* Group descriptor's blkno. */
 237         __u32 clusters;         /* Total number of clusters in this group */
 238         __u32 frees;            /* Total free clusters in this group */
 239         __u16 chain;            /* Chain for this group */
 240         __u16 reserved1;
 241         __u32 reserved2;
 242 };
 243
 244 #define OCFS2_IOC_GROUP_EXTEND  _IOW('o', 1, int)
 245 #define OCFS2_IOC_GROUP_ADD     _IOW('o', 2,struct ocfs2_new_group_input)
 246 #define OCFS2_IOC_GROUP_ADD64   _IOW('o', 3,struct ocfs2_new_group_input)
 247
 248 /*
 249  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 250  */
 251 #define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 252
 253 /*
 254  * superblock s_state flags
 255  */
 256 #define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 257
 258 /* Limit of space in ocfs2_dir_entry */
 259 #define OCFS2_MAX_FILENAME_LEN          255
 260
 261 /* Maximum slots on an ocfs2 file system */
 262 #define OCFS2_MAX_SLOTS                 255
 263
 264 /* Slot map indicator for an empty slot */
 265 #define OCFS2_INVALID_SLOT              -1
 266
 267 #define OCFS2_VOL_UUID_LEN              16
 268 #define OCFS2_MAX_VOL_LABEL_LEN         64
 269
 270 /* Journal limits (in bytes) */
 271 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 272
 273 /*
 274  * Default local alloc size (in megabytes)
 275  *
 276  * The value chosen should be such that most allocations, including new
 277  * block groups, use local alloc.
 278  */
 279 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE  8
 280
 281 struct ocfs2_system_inode_info {
 282         char    *si_name;
 283         int     si_iflags;
 284         int     si_mode;
 285 };
 286
 287 /* System file index */
 288 enum {
 289         BAD_BLOCK_SYSTEM_INODE = 0,
 290         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 291         SLOT_MAP_SYSTEM_INODE,
 292 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 293         HEARTBEAT_SYSTEM_INODE,
 294         GLOBAL_BITMAP_SYSTEM_INODE,
 295 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
 296         ORPHAN_DIR_SYSTEM_INODE,
 297         EXTENT_ALLOC_SYSTEM_INODE,
 298         INODE_ALLOC_SYSTEM_INODE,
 299         JOURNAL_SYSTEM_INODE,
 300         LOCAL_ALLOC_SYSTEM_INODE,
 301         TRUNCATE_LOG_SYSTEM_INODE,
 302         NUM_SYSTEM_INODES
 303 };
 304
 305 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 306         /* Global system inodes (single copy) */
 307         /* The first two are only used from userspace mfks/tunefs */
 308         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 309         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 310
 311         /* These are used by the running filesystem */
 312         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 313         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 314         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 315
 316         /* Slot-specific system inodes (one copy per slot) */
 317         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 318         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 319         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 320         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 321         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 322         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
 323 };
 324
 325 /* Parameter passed from mount.ocfs2 to module */
 326 #define OCFS2_HB_NONE                   "heartbeat=none"
 327 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 328
 329 /*
 330  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 331  * other bits are reserved for now.
 332  */
 333 #define OCFS2_FT_UNKNOWN        0
 334 #define OCFS2_FT_REG_FILE       1
 335 #define OCFS2_FT_DIR            2
 336 #define OCFS2_FT_CHRDEV         3
 337 #define OCFS2_FT_BLKDEV         4
 338 #define OCFS2_FT_FIFO           5
 339 #define OCFS2_FT_SOCK           6
 340 #define OCFS2_FT_SYMLINK        7
 341
 342 #define OCFS2_FT_MAX            8
 343
 344 /*
 345  * OCFS2_DIR_PAD defines the directory entries boundaries
 346  *
 347  * NOTE: It must be a multiple of 4
 348  */
 349 #define OCFS2_DIR_PAD                   4
 350 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 351 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 352 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 353                                           OCFS2_DIR_ROUND) & \
 354                                          ~OCFS2_DIR_ROUND)
 355
 356 #define OCFS2_LINK_MAX          32000
 357
 358 #define S_SHIFT                 12
 359 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 360         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 361         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 362         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 363         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 364         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 365         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 366         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 367 };
 368
 369
 370 /*
 371  * Convenience casts
 372  */
 373 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 374
 375 /*
 376  * On disk extent record for OCFS2
 377  * It describes a range of clusters on disk.
 378  *
 379  * Length fields are divided into interior and leaf node versions.
 380  * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 381  */
 382 struct ocfs2_extent_rec {
 383 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 384         union {
 385                 __le32 e_int_clusters; /* Clusters covered by all children */
 386                 struct {
 387                         __le16 e_leaf_clusters; /* Clusters covered by this
 388                                                    extent */
 389                         __u8 e_reserved1;
 390                         __u8 e_flags; /* Extent flags */
 391                 };
 392         };
 393         __le64 e_blkno;         /* Physical disk offset, in blocks */
 394 /*10*/
 395 };
 396
 397 struct ocfs2_chain_rec {
 398         __le32 c_free;  /* Number of free bits in this chain. */
 399         __le32 c_total; /* Number of total bits in this chain */
 400         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 401 };
 402
 403 struct ocfs2_truncate_rec {
 404         __le32 t_start;         /* 1st cluster in this log */
 405         __le32 t_clusters;      /* Number of total clusters covered */
 406 };
 407
 408 /*
 409  * On disk extent list for OCFS2 (node in the tree).  Note that this
 410  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 411  * offsets are relative to ocfs2_dinode.id2.i_list or
 412  * ocfs2_extent_block.h_list, respectively.
 413  */
 414 struct ocfs2_extent_list {
 415 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 416                                            point.  0 means data extents
 417                                            hang directly off this
 418                                            header (a leaf)
 419                                            NOTE: The high 8 bits cannot be
 420                                            used - tree_depth is never that big.
 421                                         */
 422         __le16 l_count;                 /* Number of extent records */
 423         __le16 l_next_free_rec;         /* Next unused extent slot */
 424         __le16 l_reserved1;
 425         __le64 l_reserved2;             /* Pad to
 426                                            sizeof(ocfs2_extent_rec) */
 427 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 428 };
 429
 430 /*
 431  * On disk allocation chain list for OCFS2.  Note that this is
 432  * contained inside ocfs2_dinode, so the offsets are relative to
 433  * ocfs2_dinode.id2.i_chain.
 434  */
 435 struct ocfs2_chain_list {
 436 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 437         __le16 cl_bpc;                  /* Bits per cluster */
 438         __le16 cl_count;                /* Total chains in this list */
 439         __le16 cl_next_free_rec;        /* Next unused chain slot */
 440         __le64 cl_reserved1;
 441 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 442 };
 443
 444 /*
 445  * On disk deallocation log for OCFS2.  Note that this is
 446  * contained inside ocfs2_dinode, so the offsets are relative to
 447  * ocfs2_dinode.id2.i_dealloc.
 448  */
 449 struct ocfs2_truncate_log {
 450 /*00*/  __le16 tl_count;                /* Total records in this log */
 451         __le16 tl_used;                 /* Number of records in use */
 452         __le32 tl_reserved1;
 453 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 454 };
 455
 456 /*
 457  * On disk extent block (indirect block) for OCFS2
 458  */
 459 struct ocfs2_extent_block
 460 {
 461 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 462         __le64 h_reserved1;
 463 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 464                                            extent_header belongs to */
 465         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 466                                            block group */
 467         __le32 h_fs_generation;         /* Must match super block */
 468         __le64 h_blkno;                 /* Offset on disk, in blocks */
 469 /*20*/  __le64 h_reserved3;
 470         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 471                                            of next leaf header pointing
 472                                            to data */
 473 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 474 /* Actual on-disk size is one block */
 475 };
 476
 477 /*
 478  * On disk superblock for OCFS2
 479  * Note that it is contained inside an ocfs2_dinode, so all offsets
 480  * are relative to the start of ocfs2_dinode.id2.
 481  */
 482 struct ocfs2_super_block {
 483 /*00*/  __le16 s_major_rev_level;
 484         __le16 s_minor_rev_level;
 485         __le16 s_mnt_count;
 486         __le16 s_max_mnt_count;
 487         __le16 s_state;                 /* File system state */
 488         __le16 s_errors;                        /* Behaviour when detecting errors */
 489         __le32 s_checkinterval;         /* Max time between checks */
 490 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 491         __le32 s_creator_os;            /* OS */
 492         __le32 s_feature_compat;                /* Compatible feature set */
 493 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 494         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 495         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 496                                            dinode */
 497 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 498                                            directory dinode */
 499         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 500         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 501 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 502                                            before tunefs required */
 503         __le16 s_tunefs_flag;
 504         __le32 s_reserved1;
 505         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 506                                          * group header */
 507 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 508 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 509 /*A0*/
 510 };
 511
 512 /*
 513  * Local allocation bitmap for OCFS2 slots
 514  * Note that it exists inside an ocfs2_dinode, so all offsets are
 515  * relative to the start of ocfs2_dinode.id2.
 516  */
 517 struct ocfs2_local_alloc
 518 {
 519 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 520         __le16 la_size;         /* Size of included bitmap, in bytes */
 521         __le16 la_reserved1;
 522         __le64 la_reserved2;
 523 /*10*/  __u8   la_bitmap[0];
 524 };
 525
 526 /*
 527  * Data-in-inode header. This is only used if i_dyn_features has
 528  * OCFS2_INLINE_DATA_FL set.
 529  */
 530 struct ocfs2_inline_data
 531 {
 532 /*00*/  __le16  id_count;       /* Number of bytes that can be used
 533                                  * for data, starting at id_data */
 534         __le16  id_reserved0;
 535         __le32  id_reserved1;
 536         __u8    id_data[0];     /* Start of user data */
 537 };
 538
 539 /*
 540  * On disk inode for OCFS2
 541  */
 542 struct ocfs2_dinode {
 543 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 544         __le32 i_generation;            /* Generation number */
 545         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 546                                            belongs to */
 547         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 548                                            block group */
 549 /*10*/  __le32 i_reserved0;
 550         __le32 i_clusters;              /* Cluster count */
 551         __le32 i_uid;                   /* Owner UID */
 552         __le32 i_gid;                   /* Owning GID */
 553 /*20*/  __le64 i_size;                  /* Size in bytes */
 554         __le16 i_mode;                  /* File mode */
 555         __le16 i_links_count;           /* Links count */
 556         __le32 i_flags;                 /* File flags */
 557 /*30*/  __le64 i_atime;                 /* Access time */
 558         __le64 i_ctime;                 /* Creation time */
 559 /*40*/  __le64 i_mtime;                 /* Modification time */
 560         __le64 i_dtime;                 /* Deletion time */
 561 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 562         __le64 i_last_eb_blk;           /* Pointer to last extent
 563                                            block */
 564 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 565         __le32 i_atime_nsec;
 566         __le32 i_ctime_nsec;
 567         __le32 i_mtime_nsec;
 568         __le32 i_attr;
 569         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
 570                                            was set in i_flags */
 571         __le16 i_dyn_features;
 572 /*70*/  __le64 i_reserved2[8];
 573 /*B8*/  union {
 574                 __le64 i_pad1;          /* Generic way to refer to this
 575                                            64bit union */
 576                 struct {
 577                         __le64 i_rdev;  /* Device number */
 578                 } dev1;
 579                 struct {                /* Info for bitmap system
 580                                            inodes */
 581                         __le32 i_used;  /* Bits (ie, clusters) used  */
 582                         __le32 i_total; /* Total bits (clusters)
 583                                            available */
 584                 } bitmap1;
 585                 struct {                /* Info for journal system
 586                                            inodes */
 587                         __le32 ij_flags;        /* Mounted, version, etc. */
 588                         __le32 ij_pad;
 589                 } journal1;
 590         } id1;                          /* Inode type dependant 1 */
 591 /*C0*/  union {
 592                 struct ocfs2_super_block        i_super;
 593                 struct ocfs2_local_alloc        i_lab;
 594                 struct ocfs2_chain_list         i_chain;
 595                 struct ocfs2_extent_list        i_list;
 596                 struct ocfs2_truncate_log       i_dealloc;
 597                 struct ocfs2_inline_data        i_data;
 598                 __u8                            i_symlink[0];
 599         } id2;
 600 /* Actual on-disk size is one block */
 601 };
 602
 603 /*
 604  * On-disk directory entry structure for OCFS2
 605  *
 606  * Packed as this structure could be accessed unaligned on 64-bit platforms
 607  */
 608 struct ocfs2_dir_entry {
 609 /*00*/  __le64   inode;                  /* Inode number */
 610         __le16   rec_len;                /* Directory entry length */
 611         __u8    name_len;               /* Name length */
 612         __u8    file_type;
 613 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 614 /* Actual on-disk length specified by rec_len */
 615 } __attribute__ ((packed));
 616
 617 /*
 618  * On disk allocator group structure for OCFS2
 619  */
 620 struct ocfs2_group_desc
 621 {
 622 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 623         __le16   bg_size;                /* Size of included bitmap in
 624                                            bytes. */
 625         __le16   bg_bits;                /* Bits represented by this
 626                                            group. */
 627         __le16  bg_free_bits_count;     /* Free bits count */
 628         __le16   bg_chain;               /* What chain I am in. */
 629 /*10*/  __le32   bg_generation;
 630         __le32  bg_reserved1;
 631         __le64   bg_next_group;          /* Next group in my list, in
 632                                            blocks */
 633 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 634                                            blocks */
 635         __le64   bg_blkno;               /* Offset on disk, in blocks */
 636 /*30*/  __le64   bg_reserved2[2];
 637 /*40*/  __u8    bg_bitmap[0];
 638 };
 639
 640 #ifdef __KERNEL__
 641 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 642 {
 643         return  sb->s_blocksize -
 644                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 645 }
 646
 647 static inline int ocfs2_max_inline_data(struct super_block *sb)
 648 {
 649         return sb->s_blocksize -
 650                 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 651 }
 652
 653 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 654 {
 655         int size;
 656
 657         size = sb->s_blocksize -
 658                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 659
 660         return size / sizeof(struct ocfs2_extent_rec);
 661 }
 662
 663 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 664 {
 665         int size;
 666
 667         size = sb->s_blocksize -
 668                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 669
 670         return size / sizeof(struct ocfs2_chain_rec);
 671 }
 672
 673 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 674 {
 675         int size;
 676
 677         size = sb->s_blocksize -
 678                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 679
 680         return size / sizeof(struct ocfs2_extent_rec);
 681 }
 682
 683 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 684 {
 685         u16 size;
 686
 687         size = sb->s_blocksize -
 688                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 689
 690         return size;
 691 }
 692
 693 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 694 {
 695         int size;
 696
 697         size = sb->s_blocksize -
 698                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 699
 700         return size;
 701 }
 702
 703 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 704 {
 705         int size;
 706
 707         size = sb->s_blocksize -
 708                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 709
 710         return size / sizeof(struct ocfs2_truncate_rec);
 711 }
 712
 713 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
 714 {
 715         u64 offset = OCFS2_BACKUP_SB_START;
 716
 717         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
 718                 offset <<= (2 * index);
 719                 offset >>= sb->s_blocksize_bits;
 720                 return offset;
 721         }
 722
 723         return 0;
 724
 725 }
 726 #else
 727 static inline int ocfs2_fast_symlink_chars(int blocksize)
 728 {
 729         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 730 }
 731
 732 static inline int ocfs2_max_inline_data(int blocksize)
 733 {
 734         return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 735 }
 736
 737 static inline int ocfs2_extent_recs_per_inode(int blocksize)
 738 {
 739         int size;
 740
 741         size = blocksize -
 742                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 743
 744         return size / sizeof(struct ocfs2_extent_rec);
 745 }
 746
 747 static inline int ocfs2_chain_recs_per_inode(int blocksize)
 748 {
 749         int size;
 750
 751         size = blocksize -
 752                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 753
 754         return size / sizeof(struct ocfs2_chain_rec);
 755 }
 756
 757 static inline int ocfs2_extent_recs_per_eb(int blocksize)
 758 {
 759         int size;
 760
 761         size = blocksize -
 762                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 763
 764         return size / sizeof(struct ocfs2_extent_rec);
 765 }
 766
 767 static inline int ocfs2_local_alloc_size(int blocksize)
 768 {
 769         int size;
 770
 771         size = blocksize -
 772                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 773
 774         return size;
 775 }
 776
 777 static inline int ocfs2_group_bitmap_size(int blocksize)
 778 {
 779         int size;
 780
 781         size = blocksize -
 782                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 783
 784         return size;
 785 }
 786
 787 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 788 {
 789         int size;
 790
 791         size = blocksize -
 792                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 793
 794         return size / sizeof(struct ocfs2_truncate_rec);
 795 }
 796
 797 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
 798 {
 799         uint64_t offset = OCFS2_BACKUP_SB_START;
 800
 801         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
 802                 offset <<= (2 * index);
 803                 offset /= blocksize;
 804                 return offset;
 805         }
 806
 807         return 0;
 808 }
 809 #endif  /* __KERNEL__ */
 810
 811
 812 static inline int ocfs2_system_inode_is_global(int type)
 813 {
 814         return ((type >= 0) &&
 815                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
 816 }
 817
 818 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
 819                                                   int type, int slot)
 820 {
 821         int chars;
 822
 823         /*
 824          * Global system inodes can only have one copy.  Everything
 825          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
 826          * list has a copy per slot.
 827          */
 828         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
 829                 chars = snprintf(buf, len,
 830                                  ocfs2_system_inodes[type].si_name);
 831         else
 832                 chars = snprintf(buf, len,
 833                                  ocfs2_system_inodes[type].si_name,
 834                                  slot);
 835
 836         return chars;
 837 }
 838
 839 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
 840                                     umode_t mode)
 841 {
 842         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 843 }
 844
 845 #endif  /* _OCFS2_FS_H */
 846