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 #define OCFS2_XATTR_BLOCK_SIGNATURE     "XATTR01"
  68
  69 /* Compatibility flags */
  70 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
  71         ( OCFS2_SB(sb)->s_feature_compat & (mask) )
  72 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)                    \
  73         ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
  74 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)                     \
  75         ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
  76 #define OCFS2_SET_COMPAT_FEATURE(sb,mask)                       \
  77         OCFS2_SB(sb)->s_feature_compat |= (mask)
  78 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)                    \
  79         OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
  80 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)                     \
  81         OCFS2_SB(sb)->s_feature_incompat |= (mask)
  82 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)                     \
  83         OCFS2_SB(sb)->s_feature_compat &= ~(mask)
  84 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                  \
  85         OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
  86 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)                   \
  87         OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
  88
  89 #define OCFS2_FEATURE_COMPAT_SUPP       (OCFS2_FEATURE_COMPAT_BACKUP_SB \
  90                                          | OCFS2_FEATURE_COMPAT_JBD2_SB)
  91 #define OCFS2_FEATURE_INCOMPAT_SUPP     (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
  92                                          | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
  93                                          | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
  94                                          | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
  95                                          | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
  96                                          | OCFS2_FEATURE_INCOMPAT_XATTR)
  97 #define OCFS2_FEATURE_RO_COMPAT_SUPP    OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
  98
  99 /*
 100  * Heartbeat-only devices are missing journals and other files.  The
 101  * filesystem driver can't load them, but the library can.  Never put
 102  * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
 103  */
 104 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV    0x0002
 105
 106 /*
 107  * tunefs sets this incompat flag before starting the resize and clears it
 108  * at the end. This flag protects users from inadvertently mounting the fs
 109  * after an aborted run without fsck-ing.
 110  */
 111 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004
 112
 113 /* Used to denote a non-clustered volume */
 114 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT      0x0008
 115
 116 /* Support for sparse allocation in b-trees */
 117 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC     0x0010
 118
 119 /*
 120  * Tunefs sets this incompat flag before starting an operation which
 121  * would require cleanup on abort. This is done to protect users from
 122  * inadvertently mounting the fs after an aborted run without
 123  * fsck-ing.
 124  *
 125  * s_tunefs_flags on the super block describes precisely which
 126  * operations were in progress.
 127  */
 128 #define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG    0x0020
 129
 130 /* Support for data packed into inode blocks */
 131 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA      0x0040
 132
 133 /*
 134  * Support for alternate, userspace cluster stacks.  If set, the superblock
 135  * field s_cluster_info contains a tag for the alternate stack in use as
 136  * well as the name of the cluster being joined.
 137  * mount.ocfs2 must pass in a matching stack name.
 138  *
 139  * If not set, the classic stack will be used.  This is compatbile with
 140  * all older versions.
 141  */
 142 #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK  0x0080
 143
 144 /* Support for the extended slot map */
 145 #define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
 146
 147 /* Support for extended attributes */
 148 #define OCFS2_FEATURE_INCOMPAT_XATTR            0x0200
 149
 150 /*
 151  * backup superblock flag is used to indicate that this volume
 152  * has backup superblocks.
 153  */
 154 #define OCFS2_FEATURE_COMPAT_BACKUP_SB          0x0001
 155
 156 /*
 157  * The filesystem will correctly handle journal feature bits.
 158  */
 159 #define OCFS2_FEATURE_COMPAT_JBD2_SB            0x0002
 160
 161 /*
 162  * Unwritten extents support.
 163  */
 164 #define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN       0x0001
 165
 166 /* The byte offset of the first backup block will be 1G.
 167  * The following will be 4G, 16G, 64G, 256G and 1T.
 168  */
 169 #define OCFS2_BACKUP_SB_START                   1 << 30
 170
 171 /* the max backup superblock nums */
 172 #define OCFS2_MAX_BACKUP_SUPERBLOCKS    6
 173
 174 /*
 175  * Flags on ocfs2_super_block.s_tunefs_flags
 176  */
 177 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT         0x0001  /* Removing slots */
 178
 179 /*
 180  * Flags on ocfs2_dinode.i_flags
 181  */
 182 #define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
 183 #define OCFS2_UNUSED2_FL        (0x00000002)
 184 #define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
 185 #define OCFS2_UNUSED3_FL        (0x00000008)
 186 /* System inode flags */
 187 #define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
 188 #define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
 189 #define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
 190 #define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
 191 #define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
 192 #define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
 193 #define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 194 #define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 195
 196 /*
 197  * Flags on ocfs2_dinode.i_dyn_features
 198  *
 199  * These can change much more often than i_flags. When adding flags,
 200  * keep in mind that i_dyn_features is only 16 bits wide.
 201  */
 202 #define OCFS2_INLINE_DATA_FL    (0x0001)        /* Data stored in inode block */
 203 #define OCFS2_HAS_XATTR_FL      (0x0002)
 204 #define OCFS2_INLINE_XATTR_FL   (0x0004)
 205 #define OCFS2_INDEXED_DIR_FL    (0x0008)
 206
 207 /* Inode attributes, keep in sync with EXT2 */
 208 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
 209 #define OCFS2_UNRM_FL           (0x00000002)    /* Undelete */
 210 #define OCFS2_COMPR_FL          (0x00000004)    /* Compress file */
 211 #define OCFS2_SYNC_FL           (0x00000008)    /* Synchronous updates */
 212 #define OCFS2_IMMUTABLE_FL      (0x00000010)    /* Immutable file */
 213 #define OCFS2_APPEND_FL         (0x00000020)    /* writes to file may only append */
 214 #define OCFS2_NODUMP_FL         (0x00000040)    /* do not dump file */
 215 #define OCFS2_NOATIME_FL        (0x00000080)    /* do not update atime */
 216 #define OCFS2_DIRSYNC_FL        (0x00010000)    /* dirsync behaviour (directories only) */
 217
 218 #define OCFS2_FL_VISIBLE        (0x000100FF)    /* User visible flags */
 219 #define OCFS2_FL_MODIFIABLE     (0x000100FF)    /* User modifiable flags */
 220
 221 /*
 222  * Extent record flags (e_node.leaf.flags)
 223  */
 224 #define OCFS2_EXT_UNWRITTEN     (0x01)  /* Extent is allocated but
 225                                          * unwritten */
 226
 227 /*
 228  * ioctl commands
 229  */
 230 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
 231 #define OCFS2_IOC_SETFLAGS      _IOW('f', 2, long)
 232 #define OCFS2_IOC32_GETFLAGS    _IOR('f', 1, int)
 233 #define OCFS2_IOC32_SETFLAGS    _IOW('f', 2, int)
 234
 235 /*
 236  * Space reservation / allocation / free ioctls and argument structure
 237  * are designed to be compatible with XFS.
 238  *
 239  * ALLOCSP* and FREESP* are not and will never be supported, but are
 240  * included here for completeness.
 241  */
 242 struct ocfs2_space_resv {
 243         __s16           l_type;
 244         __s16           l_whence;
 245         __s64           l_start;
 246         __s64           l_len;          /* len == 0 means until end of file */
 247         __s32           l_sysid;
 248         __u32           l_pid;
 249         __s32           l_pad[4];       /* reserve area                     */
 250 };
 251
 252 #define OCFS2_IOC_ALLOCSP               _IOW ('X', 10, struct ocfs2_space_resv)
 253 #define OCFS2_IOC_FREESP                _IOW ('X', 11, struct ocfs2_space_resv)
 254 #define OCFS2_IOC_RESVSP                _IOW ('X', 40, struct ocfs2_space_resv)
 255 #define OCFS2_IOC_UNRESVSP      _IOW ('X', 41, struct ocfs2_space_resv)
 256 #define OCFS2_IOC_ALLOCSP64     _IOW ('X', 36, struct ocfs2_space_resv)
 257 #define OCFS2_IOC_FREESP64      _IOW ('X', 37, struct ocfs2_space_resv)
 258 #define OCFS2_IOC_RESVSP64      _IOW ('X', 42, struct ocfs2_space_resv)
 259 #define OCFS2_IOC_UNRESVSP64    _IOW ('X', 43, struct ocfs2_space_resv)
 260
 261 /* Used to pass group descriptor data when online resize is done */
 262 struct ocfs2_new_group_input {
 263         __u64 group;            /* Group descriptor's blkno. */
 264         __u32 clusters;         /* Total number of clusters in this group */
 265         __u32 frees;            /* Total free clusters in this group */
 266         __u16 chain;            /* Chain for this group */
 267         __u16 reserved1;
 268         __u32 reserved2;
 269 };
 270
 271 #define OCFS2_IOC_GROUP_EXTEND  _IOW('o', 1, int)
 272 #define OCFS2_IOC_GROUP_ADD     _IOW('o', 2,struct ocfs2_new_group_input)
 273 #define OCFS2_IOC_GROUP_ADD64   _IOW('o', 3,struct ocfs2_new_group_input)
 274
 275 /*
 276  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 277  */
 278 #define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 279
 280 /*
 281  * superblock s_state flags
 282  */
 283 #define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 284
 285 /* Limit of space in ocfs2_dir_entry */
 286 #define OCFS2_MAX_FILENAME_LEN          255
 287
 288 /* Maximum slots on an ocfs2 file system */
 289 #define OCFS2_MAX_SLOTS                 255
 290
 291 /* Slot map indicator for an empty slot */
 292 #define OCFS2_INVALID_SLOT              -1
 293
 294 #define OCFS2_VOL_UUID_LEN              16
 295 #define OCFS2_MAX_VOL_LABEL_LEN         64
 296
 297 /* The alternate, userspace stack fields */
 298 #define OCFS2_STACK_LABEL_LEN           4
 299 #define OCFS2_CLUSTER_NAME_LEN          16
 300
 301 /* Journal limits (in bytes) */
 302 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 303
 304 /*
 305  * Default local alloc size (in megabytes)
 306  *
 307  * The value chosen should be such that most allocations, including new
 308  * block groups, use local alloc.
 309  */
 310 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE  8
 311
 312 /*
 313  * Inline extended attribute size (in bytes)
 314  * The value chosen should be aligned to 16 byte boundaries.
 315  */
 316 #define OCFS2_MIN_XATTR_INLINE_SIZE     256
 317
 318 struct ocfs2_system_inode_info {
 319         char    *si_name;
 320         int     si_iflags;
 321         int     si_mode;
 322 };
 323
 324 /* System file index */
 325 enum {
 326         BAD_BLOCK_SYSTEM_INODE = 0,
 327         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 328         SLOT_MAP_SYSTEM_INODE,
 329 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 330         HEARTBEAT_SYSTEM_INODE,
 331         GLOBAL_BITMAP_SYSTEM_INODE,
 332 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
 333         ORPHAN_DIR_SYSTEM_INODE,
 334         EXTENT_ALLOC_SYSTEM_INODE,
 335         INODE_ALLOC_SYSTEM_INODE,
 336         JOURNAL_SYSTEM_INODE,
 337         LOCAL_ALLOC_SYSTEM_INODE,
 338         TRUNCATE_LOG_SYSTEM_INODE,
 339         NUM_SYSTEM_INODES
 340 };
 341
 342 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 343         /* Global system inodes (single copy) */
 344         /* The first two are only used from userspace mfks/tunefs */
 345         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 346         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 347
 348         /* These are used by the running filesystem */
 349         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 350         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 351         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 352
 353         /* Slot-specific system inodes (one copy per slot) */
 354         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 355         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 356         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 357         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 358         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 359         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
 360 };
 361
 362 /* Parameter passed from mount.ocfs2 to module */
 363 #define OCFS2_HB_NONE                   "heartbeat=none"
 364 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 365
 366 /*
 367  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 368  * other bits are reserved for now.
 369  */
 370 #define OCFS2_FT_UNKNOWN        0
 371 #define OCFS2_FT_REG_FILE       1
 372 #define OCFS2_FT_DIR            2
 373 #define OCFS2_FT_CHRDEV         3
 374 #define OCFS2_FT_BLKDEV         4
 375 #define OCFS2_FT_FIFO           5
 376 #define OCFS2_FT_SOCK           6
 377 #define OCFS2_FT_SYMLINK        7
 378
 379 #define OCFS2_FT_MAX            8
 380
 381 /*
 382  * OCFS2_DIR_PAD defines the directory entries boundaries
 383  *
 384  * NOTE: It must be a multiple of 4
 385  */
 386 #define OCFS2_DIR_PAD                   4
 387 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 388 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 389 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 390                                           OCFS2_DIR_ROUND) & \
 391                                          ~OCFS2_DIR_ROUND)
 392
 393 #define OCFS2_LINK_MAX          32000
 394
 395 #define S_SHIFT                 12
 396 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 397         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 398         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 399         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 400         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 401         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 402         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 403         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 404 };
 405
 406
 407 /*
 408  * Convenience casts
 409  */
 410 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 411
 412 /*
 413  * On disk extent record for OCFS2
 414  * It describes a range of clusters on disk.
 415  *
 416  * Length fields are divided into interior and leaf node versions.
 417  * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 418  */
 419 struct ocfs2_extent_rec {
 420 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 421         union {
 422                 __le32 e_int_clusters; /* Clusters covered by all children */
 423                 struct {
 424                         __le16 e_leaf_clusters; /* Clusters covered by this
 425                                                    extent */
 426                         __u8 e_reserved1;
 427                         __u8 e_flags; /* Extent flags */
 428                 };
 429         };
 430         __le64 e_blkno;         /* Physical disk offset, in blocks */
 431 /*10*/
 432 };
 433
 434 struct ocfs2_chain_rec {
 435         __le32 c_free;  /* Number of free bits in this chain. */
 436         __le32 c_total; /* Number of total bits in this chain */
 437         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 438 };
 439
 440 struct ocfs2_truncate_rec {
 441         __le32 t_start;         /* 1st cluster in this log */
 442         __le32 t_clusters;      /* Number of total clusters covered */
 443 };
 444
 445 /*
 446  * On disk extent list for OCFS2 (node in the tree).  Note that this
 447  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 448  * offsets are relative to ocfs2_dinode.id2.i_list or
 449  * ocfs2_extent_block.h_list, respectively.
 450  */
 451 struct ocfs2_extent_list {
 452 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 453                                            point.  0 means data extents
 454                                            hang directly off this
 455                                            header (a leaf)
 456                                            NOTE: The high 8 bits cannot be
 457                                            used - tree_depth is never that big.
 458                                         */
 459         __le16 l_count;                 /* Number of extent records */
 460         __le16 l_next_free_rec;         /* Next unused extent slot */
 461         __le16 l_reserved1;
 462         __le64 l_reserved2;             /* Pad to
 463                                            sizeof(ocfs2_extent_rec) */
 464 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 465 };
 466
 467 /*
 468  * On disk allocation chain list for OCFS2.  Note that this is
 469  * contained inside ocfs2_dinode, so the offsets are relative to
 470  * ocfs2_dinode.id2.i_chain.
 471  */
 472 struct ocfs2_chain_list {
 473 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 474         __le16 cl_bpc;                  /* Bits per cluster */
 475         __le16 cl_count;                /* Total chains in this list */
 476         __le16 cl_next_free_rec;        /* Next unused chain slot */
 477         __le64 cl_reserved1;
 478 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 479 };
 480
 481 /*
 482  * On disk deallocation log for OCFS2.  Note that this is
 483  * contained inside ocfs2_dinode, so the offsets are relative to
 484  * ocfs2_dinode.id2.i_dealloc.
 485  */
 486 struct ocfs2_truncate_log {
 487 /*00*/  __le16 tl_count;                /* Total records in this log */
 488         __le16 tl_used;                 /* Number of records in use */
 489         __le32 tl_reserved1;
 490 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 491 };
 492
 493 /*
 494  * On disk extent block (indirect block) for OCFS2
 495  */
 496 struct ocfs2_extent_block
 497 {
 498 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 499         __le64 h_reserved1;
 500 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 501                                            extent_header belongs to */
 502         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 503                                            block group */
 504         __le32 h_fs_generation;         /* Must match super block */
 505         __le64 h_blkno;                 /* Offset on disk, in blocks */
 506 /*20*/  __le64 h_reserved3;
 507         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 508                                            of next leaf header pointing
 509                                            to data */
 510 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 511 /* Actual on-disk size is one block */
 512 };
 513
 514 /*
 515  * On disk slot map for OCFS2.  This defines the contents of the "slot_map"
 516  * system file.  A slot is valid if it contains a node number >= 0.  The
 517  * value -1 (0xFFFF) is OCFS2_INVALID_SLOT.  This marks a slot empty.
 518  */
 519 struct ocfs2_slot_map {
 520 /*00*/  __le16 sm_slots[0];
 521 /*
 522  * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,
 523  * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
 524  */
 525 };
 526
 527 struct ocfs2_extended_slot {
 528 /*00*/  __u8    es_valid;
 529         __u8    es_reserved1[3];
 530         __le32  es_node_num;
 531 /*10*/
 532 };
 533
 534 /*
 535  * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
 536  * is set.  It separates out the valid marker from the node number, and
 537  * has room to grow.  Unlike the old slot map, this format is defined by
 538  * i_size.
 539  */
 540 struct ocfs2_slot_map_extended {
 541 /*00*/  struct ocfs2_extended_slot se_slots[0];
 542 /*
 543  * Actual size is i_size of the slot_map system file.  It should
 544  * match s_max_slots * sizeof(struct ocfs2_extended_slot)
 545  */
 546 };
 547
 548 struct ocfs2_cluster_info {
 549 /*00*/  __u8   ci_stack[OCFS2_STACK_LABEL_LEN];
 550         __le32 ci_reserved;
 551 /*08*/  __u8   ci_cluster[OCFS2_CLUSTER_NAME_LEN];
 552 /*18*/
 553 };
 554
 555 /*
 556  * On disk superblock for OCFS2
 557  * Note that it is contained inside an ocfs2_dinode, so all offsets
 558  * are relative to the start of ocfs2_dinode.id2.
 559  */
 560 struct ocfs2_super_block {
 561 /*00*/  __le16 s_major_rev_level;
 562         __le16 s_minor_rev_level;
 563         __le16 s_mnt_count;
 564         __le16 s_max_mnt_count;
 565         __le16 s_state;                 /* File system state */
 566         __le16 s_errors;                        /* Behaviour when detecting errors */
 567         __le32 s_checkinterval;         /* Max time between checks */
 568 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 569         __le32 s_creator_os;            /* OS */
 570         __le32 s_feature_compat;                /* Compatible feature set */
 571 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 572         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 573         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 574                                            dinode */
 575 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 576                                            directory dinode */
 577         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 578         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 579 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 580                                            before tunefs required */
 581         __le16 s_tunefs_flag;
 582         __le32 s_uuid_hash;             /* hash value of uuid */
 583         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 584                                          * group header */
 585 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 586 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 587 /*A0*/  struct ocfs2_cluster_info s_cluster_info; /* Selected userspace
 588                                                      stack.  Only valid
 589                                                      with INCOMPAT flag. */
 590 /*B8*/  __le16 s_xattr_inline_size;     /* extended attribute inline size
 591                                            for this fs*/
 592         __le16 s_reserved0;
 593         __le32 s_reserved1;
 594 /*C0*/  __le64 s_reserved2[16];         /* Fill out superblock */
 595 /*140*/
 596
 597         /*
 598          * NOTE: As stated above, all offsets are relative to
 599          * ocfs2_dinode.id2, which is at 0xC0 in the inode.
 600          * 0xC0 + 0x140 = 0x200 or 512 bytes.  A superblock must fit within
 601          * our smallest blocksize, which is 512 bytes.  To ensure this,
 602          * we reserve the space in s_reserved2.  Anything past s_reserved2
 603          * will not be available on the smallest blocksize.
 604          */
 605 };
 606
 607 /*
 608  * Local allocation bitmap for OCFS2 slots
 609  * Note that it exists inside an ocfs2_dinode, so all offsets are
 610  * relative to the start of ocfs2_dinode.id2.
 611  */
 612 struct ocfs2_local_alloc
 613 {
 614 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 615         __le16 la_size;         /* Size of included bitmap, in bytes */
 616         __le16 la_reserved1;
 617         __le64 la_reserved2;
 618 /*10*/  __u8   la_bitmap[0];
 619 };
 620
 621 /*
 622  * Data-in-inode header. This is only used if i_dyn_features has
 623  * OCFS2_INLINE_DATA_FL set.
 624  */
 625 struct ocfs2_inline_data
 626 {
 627 /*00*/  __le16  id_count;       /* Number of bytes that can be used
 628                                  * for data, starting at id_data */
 629         __le16  id_reserved0;
 630         __le32  id_reserved1;
 631         __u8    id_data[0];     /* Start of user data */
 632 };
 633
 634 /*
 635  * On disk inode for OCFS2
 636  */
 637 struct ocfs2_dinode {
 638 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 639         __le32 i_generation;            /* Generation number */
 640         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 641                                            belongs to */
 642         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 643                                            block group */
 644 /*10*/  __le16 i_reserved0;
 645         __le16 i_xattr_inline_size;
 646         __le32 i_clusters;              /* Cluster count */
 647         __le32 i_uid;                   /* Owner UID */
 648         __le32 i_gid;                   /* Owning GID */
 649 /*20*/  __le64 i_size;                  /* Size in bytes */
 650         __le16 i_mode;                  /* File mode */
 651         __le16 i_links_count;           /* Links count */
 652         __le32 i_flags;                 /* File flags */
 653 /*30*/  __le64 i_atime;                 /* Access time */
 654         __le64 i_ctime;                 /* Creation time */
 655 /*40*/  __le64 i_mtime;                 /* Modification time */
 656         __le64 i_dtime;                 /* Deletion time */
 657 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 658         __le64 i_last_eb_blk;           /* Pointer to last extent
 659                                            block */
 660 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 661         __le32 i_atime_nsec;
 662         __le32 i_ctime_nsec;
 663         __le32 i_mtime_nsec;
 664 /*70*/  __le32 i_attr;
 665         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
 666                                            was set in i_flags */
 667         __le16 i_dyn_features;
 668         __le64 i_xattr_loc;
 669 /*80*/  __le64 i_reserved2[7];
 670 /*B8*/  union {
 671                 __le64 i_pad1;          /* Generic way to refer to this
 672                                            64bit union */
 673                 struct {
 674                         __le64 i_rdev;  /* Device number */
 675                 } dev1;
 676                 struct {                /* Info for bitmap system
 677                                            inodes */
 678                         __le32 i_used;  /* Bits (ie, clusters) used  */
 679                         __le32 i_total; /* Total bits (clusters)
 680                                            available */
 681                 } bitmap1;
 682                 struct {                /* Info for journal system
 683                                            inodes */
 684                         __le32 ij_flags;        /* Mounted, version, etc. */
 685                         __le32 ij_recovery_generation; /* Incremented when the
 686                                                           journal is recovered
 687                                                           after an unclean
 688                                                           shutdown */
 689                 } journal1;
 690         } id1;                          /* Inode type dependant 1 */
 691 /*C0*/  union {
 692                 struct ocfs2_super_block        i_super;
 693                 struct ocfs2_local_alloc        i_lab;
 694                 struct ocfs2_chain_list         i_chain;
 695                 struct ocfs2_extent_list        i_list;
 696                 struct ocfs2_truncate_log       i_dealloc;
 697                 struct ocfs2_inline_data        i_data;
 698                 __u8                            i_symlink[0];
 699         } id2;
 700 /* Actual on-disk size is one block */
 701 };
 702
 703 /*
 704  * On-disk directory entry structure for OCFS2
 705  *
 706  * Packed as this structure could be accessed unaligned on 64-bit platforms
 707  */
 708 struct ocfs2_dir_entry {
 709 /*00*/  __le64   inode;                  /* Inode number */
 710         __le16   rec_len;                /* Directory entry length */
 711         __u8    name_len;               /* Name length */
 712         __u8    file_type;
 713 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 714 /* Actual on-disk length specified by rec_len */
 715 } __attribute__ ((packed));
 716
 717 /*
 718  * On disk allocator group structure for OCFS2
 719  */
 720 struct ocfs2_group_desc
 721 {
 722 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 723         __le16   bg_size;                /* Size of included bitmap in
 724                                            bytes. */
 725         __le16   bg_bits;                /* Bits represented by this
 726                                            group. */
 727         __le16  bg_free_bits_count;     /* Free bits count */
 728         __le16   bg_chain;               /* What chain I am in. */
 729 /*10*/  __le32   bg_generation;
 730         __le32  bg_reserved1;
 731         __le64   bg_next_group;          /* Next group in my list, in
 732                                            blocks */
 733 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 734                                            blocks */
 735         __le64   bg_blkno;               /* Offset on disk, in blocks */
 736 /*30*/  __le64   bg_reserved2[2];
 737 /*40*/  __u8    bg_bitmap[0];
 738 };
 739
 740 /*
 741  * On disk extended attribute structure for OCFS2.
 742  */
 743
 744 /*
 745  * ocfs2_xattr_entry indicates one extend attribute.
 746  *
 747  * Note that it can be stored in inode, one block or one xattr bucket.
 748  */
 749 struct ocfs2_xattr_entry {
 750         __le32  xe_name_hash;    /* hash value of xattr prefix+suffix. */
 751         __le16  xe_name_offset;  /* byte offset from the 1st entry in the
 752                                     local xattr storage(inode, xattr block or
 753                                     xattr bucket). */
 754         __u8    xe_name_len;     /* xattr name len, does't include prefix. */
 755         __u8    xe_type;         /* the low 7 bits indicate the name prefix
 756                                   * type and the highest bit indicates whether
 757                                   * the EA is stored in the local storage. */
 758         __le64  xe_value_size;   /* real xattr value length. */
 759 };
 760
 761 /*
 762  * On disk structure for xattr header.
 763  *
 764  * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
 765  * the local xattr storage.
 766  */
 767 struct ocfs2_xattr_header {
 768         __le16  xh_count;                       /* contains the count of how
 769                                                    many records are in the
 770                                                    local xattr storage. */
 771         __le16  xh_free_start;                  /* current offset for storing
 772                                                    xattr. */
 773         __le16  xh_name_value_len;              /* total length of name/value
 774                                                    length in this bucket. */
 775         __le16  xh_num_buckets;                 /* Number of xattr buckets
 776                                                    in this extent record,
 777                                                    only valid in the first
 778                                                    bucket. */
 779         __le64  xh_csum;
 780         struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
 781 };
 782
 783 /*
 784  * On disk structure for xattr value root.
 785  *
 786  * When an xattr's value is large enough, it is stored in an external
 787  * b-tree like file data.  The xattr value root points to this structure.
 788  */
 789 struct ocfs2_xattr_value_root {
 790 /*00*/  __le32  xr_clusters;              /* clusters covered by xattr value. */
 791         __le32  xr_reserved0;
 792         __le64  xr_last_eb_blk;           /* Pointer to last extent block */
 793 /*10*/  struct ocfs2_extent_list xr_list; /* Extent record list */
 794 };
 795
 796 /*
 797  * On disk structure for xattr tree root.
 798  *
 799  * It is used when there are too many extended attributes for one file. These
 800  * attributes will be organized and stored in an indexed-btree.
 801  */
 802 struct ocfs2_xattr_tree_root {
 803 /*00*/  __le32  xt_clusters;              /* clusters covered by xattr. */
 804         __le32  xt_reserved0;
 805         __le64  xt_last_eb_blk;           /* Pointer to last extent block */
 806 /*10*/  struct ocfs2_extent_list xt_list; /* Extent record list */
 807 };
 808
 809 #define OCFS2_XATTR_INDEXED     0x1
 810 #define OCFS2_HASH_SHIFT        5
 811 #define OCFS2_XATTR_ROUND       3
 812 #define OCFS2_XATTR_SIZE(size)  (((size) + OCFS2_XATTR_ROUND) & \
 813                                 ~(OCFS2_XATTR_ROUND))
 814
 815 #define OCFS2_XATTR_BUCKET_SIZE                 4096
 816 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET       (OCFS2_XATTR_BUCKET_SIZE \
 817                                                  / OCFS2_MIN_BLOCKSIZE)
 818
 819 /*
 820  * On disk structure for xattr block.
 821  */
 822 struct ocfs2_xattr_block {
 823 /*00*/  __u8    xb_signature[8];     /* Signature for verification */
 824         __le16  xb_suballoc_slot;    /* Slot suballocator this
 825                                         block belongs to. */
 826         __le16  xb_suballoc_bit;     /* Bit offset in suballocator
 827                                         block group */
 828         __le32  xb_fs_generation;    /* Must match super block */
 829 /*10*/  __le64  xb_blkno;            /* Offset on disk, in blocks */
 830         __le64  xb_csum;
 831 /*20*/  __le16  xb_flags;            /* Indicates whether this block contains
 832                                         real xattr or a xattr tree. */
 833         __le16  xb_reserved0;
 834         __le32  xb_reserved1;
 835         __le64  xb_reserved2;
 836 /*30*/  union {
 837                 struct ocfs2_xattr_header xb_header; /* xattr header if this
 838                                                         block contains xattr */
 839                 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
 840                                                         block cotains xattr
 841                                                         tree. */
 842         } xb_attrs;
 843 };
 844
 845 #define OCFS2_XATTR_ENTRY_LOCAL         0x80
 846 #define OCFS2_XATTR_TYPE_MASK           0x7F
 847 static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
 848                                          int local)
 849 {
 850         if (local)
 851                 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
 852         else
 853                 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
 854 }
 855
 856 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
 857 {
 858         return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
 859 }
 860
 861 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
 862 {
 863         xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
 864 }
 865
 866 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
 867 {
 868         return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
 869 }
 870
 871 #ifdef __KERNEL__
 872 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 873 {
 874         return  sb->s_blocksize -
 875                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 876 }
 877
 878 static inline int ocfs2_max_inline_data(struct super_block *sb)
 879 {
 880         return sb->s_blocksize -
 881                 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 882 }
 883
 884 static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
 885                                                    struct ocfs2_dinode *di)
 886 {
 887         unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
 888
 889         if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
 890                 return sb->s_blocksize -
 891                         offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
 892                         xattrsize;
 893         else
 894                 return sb->s_blocksize -
 895                         offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 896 }
 897
 898 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 899 {
 900         int size;
 901
 902         size = sb->s_blocksize -
 903                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 904
 905         return size / sizeof(struct ocfs2_extent_rec);
 906 }
 907
 908 static inline int ocfs2_extent_recs_per_inode_with_xattr(
 909                                                 struct super_block *sb,
 910                                                 struct ocfs2_dinode *di)
 911 {
 912         int size;
 913         unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
 914
 915         if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
 916                 size = sb->s_blocksize -
 917                         offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
 918                         xattrsize;
 919         else
 920                 size = sb->s_blocksize -
 921                         offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 922
 923         return size / sizeof(struct ocfs2_extent_rec);
 924 }
 925
 926 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 927 {
 928         int size;
 929
 930         size = sb->s_blocksize -
 931                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 932
 933         return size / sizeof(struct ocfs2_chain_rec);
 934 }
 935
 936 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 937 {
 938         int size;
 939
 940         size = sb->s_blocksize -
 941                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 942
 943         return size / sizeof(struct ocfs2_extent_rec);
 944 }
 945
 946 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 947 {
 948         u16 size;
 949
 950         size = sb->s_blocksize -
 951                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 952
 953         return size;
 954 }
 955
 956 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 957 {
 958         int size;
 959
 960         size = sb->s_blocksize -
 961                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 962
 963         return size;
 964 }
 965
 966 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 967 {
 968         int size;
 969
 970         size = sb->s_blocksize -
 971                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 972
 973         return size / sizeof(struct ocfs2_truncate_rec);
 974 }
 975
 976 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
 977 {
 978         u64 offset = OCFS2_BACKUP_SB_START;
 979
 980         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
 981                 offset <<= (2 * index);
 982                 offset >>= sb->s_blocksize_bits;
 983                 return offset;
 984         }
 985
 986         return 0;
 987
 988 }
 989
 990 static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
 991 {
 992         int size;
 993
 994         size = sb->s_blocksize -
 995                 offsetof(struct ocfs2_xattr_block,
 996                          xb_attrs.xb_root.xt_list.l_recs);
 997
 998         return size / sizeof(struct ocfs2_extent_rec);
 999 }
1000 #else
1001 static inline int ocfs2_fast_symlink_chars(int blocksize)
1002 {
1003         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1004 }
1005
1006 static inline int ocfs2_max_inline_data(int blocksize)
1007 {
1008         return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1009 }
1010
1011 static inline int ocfs2_extent_recs_per_inode(int blocksize)
1012 {
1013         int size;
1014
1015         size = blocksize -
1016                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1017
1018         return size / sizeof(struct ocfs2_extent_rec);
1019 }
1020
1021 static inline int ocfs2_chain_recs_per_inode(int blocksize)
1022 {
1023         int size;
1024
1025         size = blocksize -
1026                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1027
1028         return size / sizeof(struct ocfs2_chain_rec);
1029 }
1030
1031 static inline int ocfs2_extent_recs_per_eb(int blocksize)
1032 {
1033         int size;
1034
1035         size = blocksize -
1036                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1037
1038         return size / sizeof(struct ocfs2_extent_rec);
1039 }
1040
1041 static inline int ocfs2_local_alloc_size(int blocksize)
1042 {
1043         int size;
1044
1045         size = blocksize -
1046                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1047
1048         return size;
1049 }
1050
1051 static inline int ocfs2_group_bitmap_size(int blocksize)
1052 {
1053         int size;
1054
1055         size = blocksize -
1056                 offsetof(struct ocfs2_group_desc, bg_bitmap);
1057
1058         return size;
1059 }
1060
1061 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1062 {
1063         int size;
1064
1065         size = blocksize -
1066                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1067
1068         return size / sizeof(struct ocfs2_truncate_rec);
1069 }
1070
1071 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1072 {
1073         uint64_t offset = OCFS2_BACKUP_SB_START;
1074
1075         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1076                 offset <<= (2 * index);
1077                 offset /= blocksize;
1078                 return offset;
1079         }
1080
1081         return 0;
1082 }
1083
1084 static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1085 {
1086         int size;
1087
1088         size = blocksize -
1089                 offsetof(struct ocfs2_xattr_block,
1090                          xb_attrs.xb_root.xt_list.l_recs);
1091
1092         return size / sizeof(struct ocfs2_extent_rec);
1093 }
1094 #endif  /* __KERNEL__ */
1095
1096
1097 static inline int ocfs2_system_inode_is_global(int type)
1098 {
1099         return ((type >= 0) &&
1100                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1101 }
1102
1103 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1104                                                   int type, int slot)
1105 {
1106         int chars;
1107
1108         /*
1109          * Global system inodes can only have one copy.  Everything
1110          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1111          * list has a copy per slot.
1112          */
1113         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
1114                 chars = snprintf(buf, len, "%s",
1115                                  ocfs2_system_inodes[type].si_name);
1116         else
1117                 chars = snprintf(buf, len,
1118                                  ocfs2_system_inodes[type].si_name,
1119                                  slot);
1120
1121         return chars;
1122 }
1123
1124 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1125                                     umode_t mode)
1126 {
1127         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1128 }
1129
1130 #endif  /* _OCFS2_FS_H */
1131