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