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 /*
 167  * Maintain quota information for this filesystem
 168  */
 169 #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA        0x0002
 170 #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA        0x0004
 171
 172 /* The byte offset of the first backup block will be 1G.
 173  * The following will be 4G, 16G, 64G, 256G and 1T.
 174  */
 175 #define OCFS2_BACKUP_SB_START                   1 << 30
 176
 177 /* the max backup superblock nums */
 178 #define OCFS2_MAX_BACKUP_SUPERBLOCKS    6
 179
 180 /*
 181  * Flags on ocfs2_super_block.s_tunefs_flags
 182  */
 183 #define OCFS2_TUNEFS_INPROG_REMOVE_SLOT         0x0001  /* Removing slots */
 184
 185 /*
 186  * Flags on ocfs2_dinode.i_flags
 187  */
 188 #define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
 189 #define OCFS2_UNUSED2_FL        (0x00000002)
 190 #define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
 191 #define OCFS2_UNUSED3_FL        (0x00000008)
 192 /* System inode flags */
 193 #define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
 194 #define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
 195 #define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
 196 #define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
 197 #define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
 198 #define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
 199 #define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 200 #define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 201 #define OCFS2_QUOTA_FL          (0x00001000)    /* Quota file */
 202
 203 /*
 204  * Flags on ocfs2_dinode.i_dyn_features
 205  *
 206  * These can change much more often than i_flags. When adding flags,
 207  * keep in mind that i_dyn_features is only 16 bits wide.
 208  */
 209 #define OCFS2_INLINE_DATA_FL    (0x0001)        /* Data stored in inode block */
 210 #define OCFS2_HAS_XATTR_FL      (0x0002)
 211 #define OCFS2_INLINE_XATTR_FL   (0x0004)
 212 #define OCFS2_INDEXED_DIR_FL    (0x0008)
 213
 214 /* Inode attributes, keep in sync with EXT2 */
 215 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
 216 #define OCFS2_UNRM_FL           (0x00000002)    /* Undelete */
 217 #define OCFS2_COMPR_FL          (0x00000004)    /* Compress file */
 218 #define OCFS2_SYNC_FL           (0x00000008)    /* Synchronous updates */
 219 #define OCFS2_IMMUTABLE_FL      (0x00000010)    /* Immutable file */
 220 #define OCFS2_APPEND_FL         (0x00000020)    /* writes to file may only append */
 221 #define OCFS2_NODUMP_FL         (0x00000040)    /* do not dump file */
 222 #define OCFS2_NOATIME_FL        (0x00000080)    /* do not update atime */
 223 #define OCFS2_DIRSYNC_FL        (0x00010000)    /* dirsync behaviour (directories only) */
 224
 225 #define OCFS2_FL_VISIBLE        (0x000100FF)    /* User visible flags */
 226 #define OCFS2_FL_MODIFIABLE     (0x000100FF)    /* User modifiable flags */
 227
 228 /*
 229  * Extent record flags (e_node.leaf.flags)
 230  */
 231 #define OCFS2_EXT_UNWRITTEN     (0x01)  /* Extent is allocated but
 232                                          * unwritten */
 233
 234 /*
 235  * ioctl commands
 236  */
 237 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
 238 #define OCFS2_IOC_SETFLAGS      _IOW('f', 2, long)
 239 #define OCFS2_IOC32_GETFLAGS    _IOR('f', 1, int)
 240 #define OCFS2_IOC32_SETFLAGS    _IOW('f', 2, int)
 241
 242 /*
 243  * Space reservation / allocation / free ioctls and argument structure
 244  * are designed to be compatible with XFS.
 245  *
 246  * ALLOCSP* and FREESP* are not and will never be supported, but are
 247  * included here for completeness.
 248  */
 249 struct ocfs2_space_resv {
 250         __s16           l_type;
 251         __s16           l_whence;
 252         __s64           l_start;
 253         __s64           l_len;          /* len == 0 means until end of file */
 254         __s32           l_sysid;
 255         __u32           l_pid;
 256         __s32           l_pad[4];       /* reserve area                     */
 257 };
 258
 259 #define OCFS2_IOC_ALLOCSP               _IOW ('X', 10, struct ocfs2_space_resv)
 260 #define OCFS2_IOC_FREESP                _IOW ('X', 11, struct ocfs2_space_resv)
 261 #define OCFS2_IOC_RESVSP                _IOW ('X', 40, struct ocfs2_space_resv)
 262 #define OCFS2_IOC_UNRESVSP      _IOW ('X', 41, struct ocfs2_space_resv)
 263 #define OCFS2_IOC_ALLOCSP64     _IOW ('X', 36, struct ocfs2_space_resv)
 264 #define OCFS2_IOC_FREESP64      _IOW ('X', 37, struct ocfs2_space_resv)
 265 #define OCFS2_IOC_RESVSP64      _IOW ('X', 42, struct ocfs2_space_resv)
 266 #define OCFS2_IOC_UNRESVSP64    _IOW ('X', 43, struct ocfs2_space_resv)
 267
 268 /* Used to pass group descriptor data when online resize is done */
 269 struct ocfs2_new_group_input {
 270         __u64 group;            /* Group descriptor's blkno. */
 271         __u32 clusters;         /* Total number of clusters in this group */
 272         __u32 frees;            /* Total free clusters in this group */
 273         __u16 chain;            /* Chain for this group */
 274         __u16 reserved1;
 275         __u32 reserved2;
 276 };
 277
 278 #define OCFS2_IOC_GROUP_EXTEND  _IOW('o', 1, int)
 279 #define OCFS2_IOC_GROUP_ADD     _IOW('o', 2,struct ocfs2_new_group_input)
 280 #define OCFS2_IOC_GROUP_ADD64   _IOW('o', 3,struct ocfs2_new_group_input)
 281
 282 /*
 283  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 284  */
 285 #define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 286
 287 /*
 288  * superblock s_state flags
 289  */
 290 #define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 291
 292 /* Limit of space in ocfs2_dir_entry */
 293 #define OCFS2_MAX_FILENAME_LEN          255
 294
 295 /* Maximum slots on an ocfs2 file system */
 296 #define OCFS2_MAX_SLOTS                 255
 297
 298 /* Slot map indicator for an empty slot */
 299 #define OCFS2_INVALID_SLOT              -1
 300
 301 #define OCFS2_VOL_UUID_LEN              16
 302 #define OCFS2_MAX_VOL_LABEL_LEN         64
 303
 304 /* The alternate, userspace stack fields */
 305 #define OCFS2_STACK_LABEL_LEN           4
 306 #define OCFS2_CLUSTER_NAME_LEN          16
 307
 308 /* Journal limits (in bytes) */
 309 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 310
 311 /*
 312  * Default local alloc size (in megabytes)
 313  *
 314  * The value chosen should be such that most allocations, including new
 315  * block groups, use local alloc.
 316  */
 317 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE  8
 318
 319 /*
 320  * Inline extended attribute size (in bytes)
 321  * The value chosen should be aligned to 16 byte boundaries.
 322  */
 323 #define OCFS2_MIN_XATTR_INLINE_SIZE     256
 324
 325 struct ocfs2_system_inode_info {
 326         char    *si_name;
 327         int     si_iflags;
 328         int     si_mode;
 329 };
 330
 331 /* System file index */
 332 enum {
 333         BAD_BLOCK_SYSTEM_INODE = 0,
 334         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 335         SLOT_MAP_SYSTEM_INODE,
 336 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 337         HEARTBEAT_SYSTEM_INODE,
 338         GLOBAL_BITMAP_SYSTEM_INODE,
 339         USER_QUOTA_SYSTEM_INODE,
 340         GROUP_QUOTA_SYSTEM_INODE,
 341 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
 342         ORPHAN_DIR_SYSTEM_INODE,
 343         EXTENT_ALLOC_SYSTEM_INODE,
 344         INODE_ALLOC_SYSTEM_INODE,
 345         JOURNAL_SYSTEM_INODE,
 346         LOCAL_ALLOC_SYSTEM_INODE,
 347         TRUNCATE_LOG_SYSTEM_INODE,
 348         LOCAL_USER_QUOTA_SYSTEM_INODE,
 349         LOCAL_GROUP_QUOTA_SYSTEM_INODE,
 350         NUM_SYSTEM_INODES
 351 };
 352
 353 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 354         /* Global system inodes (single copy) */
 355         /* The first two are only used from userspace mfks/tunefs */
 356         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 357         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 358
 359         /* These are used by the running filesystem */
 360         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 361         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 362         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 363         [USER_QUOTA_SYSTEM_INODE]               = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 364         [GROUP_QUOTA_SYSTEM_INODE]              = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 365
 366         /* Slot-specific system inodes (one copy per slot) */
 367         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 368         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 369         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 370         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 371         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 372         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
 373         [LOCAL_USER_QUOTA_SYSTEM_INODE]         = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 374         [LOCAL_GROUP_QUOTA_SYSTEM_INODE]        = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 375 };
 376
 377 /* Parameter passed from mount.ocfs2 to module */
 378 #define OCFS2_HB_NONE                   "heartbeat=none"
 379 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 380
 381 /*
 382  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 383  * other bits are reserved for now.
 384  */
 385 #define OCFS2_FT_UNKNOWN        0
 386 #define OCFS2_FT_REG_FILE       1
 387 #define OCFS2_FT_DIR            2
 388 #define OCFS2_FT_CHRDEV         3
 389 #define OCFS2_FT_BLKDEV         4
 390 #define OCFS2_FT_FIFO           5
 391 #define OCFS2_FT_SOCK           6
 392 #define OCFS2_FT_SYMLINK        7
 393
 394 #define OCFS2_FT_MAX            8
 395
 396 /*
 397  * OCFS2_DIR_PAD defines the directory entries boundaries
 398  *
 399  * NOTE: It must be a multiple of 4
 400  */
 401 #define OCFS2_DIR_PAD                   4
 402 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 403 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 404 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 405                                           OCFS2_DIR_ROUND) & \
 406                                          ~OCFS2_DIR_ROUND)
 407
 408 #define OCFS2_LINK_MAX          32000
 409
 410 #define S_SHIFT                 12
 411 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 412         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 413         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 414         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 415         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 416         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 417         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 418         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 419 };
 420
 421
 422 /*
 423  * Convenience casts
 424  */
 425 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 426
 427 /*
 428  * On disk extent record for OCFS2
 429  * It describes a range of clusters on disk.
 430  *
 431  * Length fields are divided into interior and leaf node versions.
 432  * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 433  */
 434 struct ocfs2_extent_rec {
 435 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 436         union {
 437                 __le32 e_int_clusters; /* Clusters covered by all children */
 438                 struct {
 439                         __le16 e_leaf_clusters; /* Clusters covered by this
 440                                                    extent */
 441                         __u8 e_reserved1;
 442                         __u8 e_flags; /* Extent flags */
 443                 };
 444         };
 445         __le64 e_blkno;         /* Physical disk offset, in blocks */
 446 /*10*/
 447 };
 448
 449 struct ocfs2_chain_rec {
 450         __le32 c_free;  /* Number of free bits in this chain. */
 451         __le32 c_total; /* Number of total bits in this chain */
 452         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 453 };
 454
 455 struct ocfs2_truncate_rec {
 456         __le32 t_start;         /* 1st cluster in this log */
 457         __le32 t_clusters;      /* Number of total clusters covered */
 458 };
 459
 460 /*
 461  * On disk extent list for OCFS2 (node in the tree).  Note that this
 462  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 463  * offsets are relative to ocfs2_dinode.id2.i_list or
 464  * ocfs2_extent_block.h_list, respectively.
 465  */
 466 struct ocfs2_extent_list {
 467 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 468                                            point.  0 means data extents
 469                                            hang directly off this
 470                                            header (a leaf)
 471                                            NOTE: The high 8 bits cannot be
 472                                            used - tree_depth is never that big.
 473                                         */
 474         __le16 l_count;                 /* Number of extent records */
 475         __le16 l_next_free_rec;         /* Next unused extent slot */
 476         __le16 l_reserved1;
 477         __le64 l_reserved2;             /* Pad to
 478                                            sizeof(ocfs2_extent_rec) */
 479 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 480 };
 481
 482 /*
 483  * On disk allocation chain list for OCFS2.  Note that this is
 484  * contained inside ocfs2_dinode, so the offsets are relative to
 485  * ocfs2_dinode.id2.i_chain.
 486  */
 487 struct ocfs2_chain_list {
 488 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 489         __le16 cl_bpc;                  /* Bits per cluster */
 490         __le16 cl_count;                /* Total chains in this list */
 491         __le16 cl_next_free_rec;        /* Next unused chain slot */
 492         __le64 cl_reserved1;
 493 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 494 };
 495
 496 /*
 497  * On disk deallocation log for OCFS2.  Note that this is
 498  * contained inside ocfs2_dinode, so the offsets are relative to
 499  * ocfs2_dinode.id2.i_dealloc.
 500  */
 501 struct ocfs2_truncate_log {
 502 /*00*/  __le16 tl_count;                /* Total records in this log */
 503         __le16 tl_used;                 /* Number of records in use */
 504         __le32 tl_reserved1;
 505 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 506 };
 507
 508 /*
 509  * On disk extent block (indirect block) for OCFS2
 510  */
 511 struct ocfs2_extent_block
 512 {
 513 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 514         __le64 h_reserved1;
 515 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 516                                            extent_header belongs to */
 517         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 518                                            block group */
 519         __le32 h_fs_generation;         /* Must match super block */
 520         __le64 h_blkno;                 /* Offset on disk, in blocks */
 521 /*20*/  __le64 h_reserved3;
 522         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 523                                            of next leaf header pointing
 524                                            to data */
 525 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 526 /* Actual on-disk size is one block */
 527 };
 528
 529 /*
 530  * On disk slot map for OCFS2.  This defines the contents of the "slot_map"
 531  * system file.  A slot is valid if it contains a node number >= 0.  The
 532  * value -1 (0xFFFF) is OCFS2_INVALID_SLOT.  This marks a slot empty.
 533  */
 534 struct ocfs2_slot_map {
 535 /*00*/  __le16 sm_slots[0];
 536 /*
 537  * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,
 538  * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
 539  */
 540 };
 541
 542 struct ocfs2_extended_slot {
 543 /*00*/  __u8    es_valid;
 544         __u8    es_reserved1[3];
 545         __le32  es_node_num;
 546 /*10*/
 547 };
 548
 549 /*
 550  * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
 551  * is set.  It separates out the valid marker from the node number, and
 552  * has room to grow.  Unlike the old slot map, this format is defined by
 553  * i_size.
 554  */
 555 struct ocfs2_slot_map_extended {
 556 /*00*/  struct ocfs2_extended_slot se_slots[0];
 557 /*
 558  * Actual size is i_size of the slot_map system file.  It should
 559  * match s_max_slots * sizeof(struct ocfs2_extended_slot)
 560  */
 561 };
 562
 563 struct ocfs2_cluster_info {
 564 /*00*/  __u8   ci_stack[OCFS2_STACK_LABEL_LEN];
 565         __le32 ci_reserved;
 566 /*08*/  __u8   ci_cluster[OCFS2_CLUSTER_NAME_LEN];
 567 /*18*/
 568 };
 569
 570 /*
 571  * On disk superblock for OCFS2
 572  * Note that it is contained inside an ocfs2_dinode, so all offsets
 573  * are relative to the start of ocfs2_dinode.id2.
 574  */
 575 struct ocfs2_super_block {
 576 /*00*/  __le16 s_major_rev_level;
 577         __le16 s_minor_rev_level;
 578         __le16 s_mnt_count;
 579         __le16 s_max_mnt_count;
 580         __le16 s_state;                 /* File system state */
 581         __le16 s_errors;                        /* Behaviour when detecting errors */
 582         __le32 s_checkinterval;         /* Max time between checks */
 583 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 584         __le32 s_creator_os;            /* OS */
 585         __le32 s_feature_compat;                /* Compatible feature set */
 586 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 587         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 588         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 589                                            dinode */
 590 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 591                                            directory dinode */
 592         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 593         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 594 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 595                                            before tunefs required */
 596         __le16 s_tunefs_flag;
 597         __le32 s_uuid_hash;             /* hash value of uuid */
 598         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 599                                          * group header */
 600 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 601 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 602 /*A0*/  struct ocfs2_cluster_info s_cluster_info; /* Selected userspace
 603                                                      stack.  Only valid
 604                                                      with INCOMPAT flag. */
 605 /*B8*/  __le16 s_xattr_inline_size;     /* extended attribute inline size
 606                                            for this fs*/
 607         __le16 s_reserved0;
 608         __le32 s_reserved1;
 609 /*C0*/  __le64 s_reserved2[16];         /* Fill out superblock */
 610 /*140*/
 611
 612         /*
 613          * NOTE: As stated above, all offsets are relative to
 614          * ocfs2_dinode.id2, which is at 0xC0 in the inode.
 615          * 0xC0 + 0x140 = 0x200 or 512 bytes.  A superblock must fit within
 616          * our smallest blocksize, which is 512 bytes.  To ensure this,
 617          * we reserve the space in s_reserved2.  Anything past s_reserved2
 618          * will not be available on the smallest blocksize.
 619          */
 620 };
 621
 622 /*
 623  * Local allocation bitmap for OCFS2 slots
 624  * Note that it exists inside an ocfs2_dinode, so all offsets are
 625  * relative to the start of ocfs2_dinode.id2.
 626  */
 627 struct ocfs2_local_alloc
 628 {
 629 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 630         __le16 la_size;         /* Size of included bitmap, in bytes */
 631         __le16 la_reserved1;
 632         __le64 la_reserved2;
 633 /*10*/  __u8   la_bitmap[0];
 634 };
 635
 636 /*
 637  * Data-in-inode header. This is only used if i_dyn_features has
 638  * OCFS2_INLINE_DATA_FL set.
 639  */
 640 struct ocfs2_inline_data
 641 {
 642 /*00*/  __le16  id_count;       /* Number of bytes that can be used
 643                                  * for data, starting at id_data */
 644         __le16  id_reserved0;
 645         __le32  id_reserved1;
 646         __u8    id_data[0];     /* Start of user data */
 647 };
 648
 649 /*
 650  * On disk inode for OCFS2
 651  */
 652 struct ocfs2_dinode {
 653 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 654         __le32 i_generation;            /* Generation number */
 655         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 656                                            belongs to */
 657         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 658                                            block group */
 659 /*10*/  __le16 i_reserved0;
 660         __le16 i_xattr_inline_size;
 661         __le32 i_clusters;              /* Cluster count */
 662         __le32 i_uid;                   /* Owner UID */
 663         __le32 i_gid;                   /* Owning GID */
 664 /*20*/  __le64 i_size;                  /* Size in bytes */
 665         __le16 i_mode;                  /* File mode */
 666         __le16 i_links_count;           /* Links count */
 667         __le32 i_flags;                 /* File flags */
 668 /*30*/  __le64 i_atime;                 /* Access time */
 669         __le64 i_ctime;                 /* Creation time */
 670 /*40*/  __le64 i_mtime;                 /* Modification time */
 671         __le64 i_dtime;                 /* Deletion time */
 672 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 673         __le64 i_last_eb_blk;           /* Pointer to last extent
 674                                            block */
 675 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 676         __le32 i_atime_nsec;
 677         __le32 i_ctime_nsec;
 678         __le32 i_mtime_nsec;
 679 /*70*/  __le32 i_attr;
 680         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
 681                                            was set in i_flags */
 682         __le16 i_dyn_features;
 683         __le64 i_xattr_loc;
 684 /*80*/  __le64 i_reserved2[7];
 685 /*B8*/  union {
 686                 __le64 i_pad1;          /* Generic way to refer to this
 687                                            64bit union */
 688                 struct {
 689                         __le64 i_rdev;  /* Device number */
 690                 } dev1;
 691                 struct {                /* Info for bitmap system
 692                                            inodes */
 693                         __le32 i_used;  /* Bits (ie, clusters) used  */
 694                         __le32 i_total; /* Total bits (clusters)
 695                                            available */
 696                 } bitmap1;
 697                 struct {                /* Info for journal system
 698                                            inodes */
 699                         __le32 ij_flags;        /* Mounted, version, etc. */
 700                         __le32 ij_recovery_generation; /* Incremented when the
 701                                                           journal is recovered
 702                                                           after an unclean
 703                                                           shutdown */
 704                 } journal1;
 705         } id1;                          /* Inode type dependant 1 */
 706 /*C0*/  union {
 707                 struct ocfs2_super_block        i_super;
 708                 struct ocfs2_local_alloc        i_lab;
 709                 struct ocfs2_chain_list         i_chain;
 710                 struct ocfs2_extent_list        i_list;
 711                 struct ocfs2_truncate_log       i_dealloc;
 712                 struct ocfs2_inline_data        i_data;
 713                 __u8                            i_symlink[0];
 714         } id2;
 715 /* Actual on-disk size is one block */
 716 };
 717
 718 /*
 719  * On-disk directory entry structure for OCFS2
 720  *
 721  * Packed as this structure could be accessed unaligned on 64-bit platforms
 722  */
 723 struct ocfs2_dir_entry {
 724 /*00*/  __le64   inode;                  /* Inode number */
 725         __le16   rec_len;                /* Directory entry length */
 726         __u8    name_len;               /* Name length */
 727         __u8    file_type;
 728 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 729 /* Actual on-disk length specified by rec_len */
 730 } __attribute__ ((packed));
 731
 732 /*
 733  * On disk allocator group structure for OCFS2
 734  */
 735 struct ocfs2_group_desc
 736 {
 737 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 738         __le16   bg_size;                /* Size of included bitmap in
 739                                            bytes. */
 740         __le16   bg_bits;                /* Bits represented by this
 741                                            group. */
 742         __le16  bg_free_bits_count;     /* Free bits count */
 743         __le16   bg_chain;               /* What chain I am in. */
 744 /*10*/  __le32   bg_generation;
 745         __le32  bg_reserved1;
 746         __le64   bg_next_group;          /* Next group in my list, in
 747                                            blocks */
 748 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 749                                            blocks */
 750         __le64   bg_blkno;               /* Offset on disk, in blocks */
 751 /*30*/  __le64   bg_reserved2[2];
 752 /*40*/  __u8    bg_bitmap[0];
 753 };
 754
 755 /*
 756  * On disk extended attribute structure for OCFS2.
 757  */
 758
 759 /*
 760  * ocfs2_xattr_entry indicates one extend attribute.
 761  *
 762  * Note that it can be stored in inode, one block or one xattr bucket.
 763  */
 764 struct ocfs2_xattr_entry {
 765         __le32  xe_name_hash;    /* hash value of xattr prefix+suffix. */
 766         __le16  xe_name_offset;  /* byte offset from the 1st entry in the
 767                                     local xattr storage(inode, xattr block or
 768                                     xattr bucket). */
 769         __u8    xe_name_len;     /* xattr name len, does't include prefix. */
 770         __u8    xe_type;         /* the low 7 bits indicate the name prefix
 771                                   * type and the highest bit indicates whether
 772                                   * the EA is stored in the local storage. */
 773         __le64  xe_value_size;   /* real xattr value length. */
 774 };
 775
 776 /*
 777  * On disk structure for xattr header.
 778  *
 779  * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
 780  * the local xattr storage.
 781  */
 782 struct ocfs2_xattr_header {
 783         __le16  xh_count;                       /* contains the count of how
 784                                                    many records are in the
 785                                                    local xattr storage. */
 786         __le16  xh_free_start;                  /* current offset for storing
 787                                                    xattr. */
 788         __le16  xh_name_value_len;              /* total length of name/value
 789                                                    length in this bucket. */
 790         __le16  xh_num_buckets;                 /* Number of xattr buckets
 791                                                    in this extent record,
 792                                                    only valid in the first
 793                                                    bucket. */
 794         __le64  xh_csum;
 795         struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
 796 };
 797
 798 /*
 799  * On disk structure for xattr value root.
 800  *
 801  * When an xattr's value is large enough, it is stored in an external
 802  * b-tree like file data.  The xattr value root points to this structure.
 803  */
 804 struct ocfs2_xattr_value_root {
 805 /*00*/  __le32  xr_clusters;              /* clusters covered by xattr value. */
 806         __le32  xr_reserved0;
 807         __le64  xr_last_eb_blk;           /* Pointer to last extent block */
 808 /*10*/  struct ocfs2_extent_list xr_list; /* Extent record list */
 809 };
 810
 811 /*
 812  * On disk structure for xattr tree root.
 813  *
 814  * It is used when there are too many extended attributes for one file. These
 815  * attributes will be organized and stored in an indexed-btree.
 816  */
 817 struct ocfs2_xattr_tree_root {
 818 /*00*/  __le32  xt_clusters;              /* clusters covered by xattr. */
 819         __le32  xt_reserved0;
 820         __le64  xt_last_eb_blk;           /* Pointer to last extent block */
 821 /*10*/  struct ocfs2_extent_list xt_list; /* Extent record list */
 822 };
 823
 824 #define OCFS2_XATTR_INDEXED     0x1
 825 #define OCFS2_HASH_SHIFT        5
 826 #define OCFS2_XATTR_ROUND       3
 827 #define OCFS2_XATTR_SIZE(size)  (((size) + OCFS2_XATTR_ROUND) & \
 828                                 ~(OCFS2_XATTR_ROUND))
 829
 830 #define OCFS2_XATTR_BUCKET_SIZE                 4096
 831 #define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET       (OCFS2_XATTR_BUCKET_SIZE \
 832                                                  / OCFS2_MIN_BLOCKSIZE)
 833
 834 /*
 835  * On disk structure for xattr block.
 836  */
 837 struct ocfs2_xattr_block {
 838 /*00*/  __u8    xb_signature[8];     /* Signature for verification */
 839         __le16  xb_suballoc_slot;    /* Slot suballocator this
 840                                         block belongs to. */
 841         __le16  xb_suballoc_bit;     /* Bit offset in suballocator
 842                                         block group */
 843         __le32  xb_fs_generation;    /* Must match super block */
 844 /*10*/  __le64  xb_blkno;            /* Offset on disk, in blocks */
 845         __le64  xb_csum;
 846 /*20*/  __le16  xb_flags;            /* Indicates whether this block contains
 847                                         real xattr or a xattr tree. */
 848         __le16  xb_reserved0;
 849         __le32  xb_reserved1;
 850         __le64  xb_reserved2;
 851 /*30*/  union {
 852                 struct ocfs2_xattr_header xb_header; /* xattr header if this
 853                                                         block contains xattr */
 854                 struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
 855                                                         block cotains xattr
 856                                                         tree. */
 857         } xb_attrs;
 858 };
 859
 860 #define OCFS2_XATTR_ENTRY_LOCAL         0x80
 861 #define OCFS2_XATTR_TYPE_MASK           0x7F
 862 static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
 863                                          int local)
 864 {
 865         if (local)
 866                 xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
 867         else
 868                 xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
 869 }
 870
 871 static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
 872 {
 873         return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
 874 }
 875
 876 static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
 877 {
 878         xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
 879 }
 880
 881 static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
 882 {
 883         return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
 884 }
 885
 886 #ifdef __KERNEL__
 887 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 888 {
 889         return  sb->s_blocksize -
 890                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 891 }
 892
 893 static inline int ocfs2_max_inline_data(struct super_block *sb)
 894 {
 895         return sb->s_blocksize -
 896                 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 897 }
 898
 899 static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
 900                                                    struct ocfs2_dinode *di)
 901 {
 902         unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
 903
 904         if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
 905                 return sb->s_blocksize -
 906                         offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
 907                         xattrsize;
 908         else
 909                 return sb->s_blocksize -
 910                         offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 911 }
 912
 913 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 914 {
 915         int size;
 916
 917         size = sb->s_blocksize -
 918                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 919
 920         return size / sizeof(struct ocfs2_extent_rec);
 921 }
 922
 923 static inline int ocfs2_extent_recs_per_inode_with_xattr(
 924                                                 struct super_block *sb,
 925                                                 struct ocfs2_dinode *di)
 926 {
 927         int size;
 928         unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
 929
 930         if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
 931                 size = sb->s_blocksize -
 932                         offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
 933                         xattrsize;
 934         else
 935                 size = sb->s_blocksize -
 936                         offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 937
 938         return size / sizeof(struct ocfs2_extent_rec);
 939 }
 940
 941 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 942 {
 943         int size;
 944
 945         size = sb->s_blocksize -
 946                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 947
 948         return size / sizeof(struct ocfs2_chain_rec);
 949 }
 950
 951 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 952 {
 953         int size;
 954
 955         size = sb->s_blocksize -
 956                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 957
 958         return size / sizeof(struct ocfs2_extent_rec);
 959 }
 960
 961 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 962 {
 963         u16 size;
 964
 965         size = sb->s_blocksize -
 966                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 967
 968         return size;
 969 }
 970
 971 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 972 {
 973         int size;
 974
 975         size = sb->s_blocksize -
 976                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 977
 978         return size;
 979 }
 980
 981 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 982 {
 983         int size;
 984
 985         size = sb->s_blocksize -
 986                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 987
 988         return size / sizeof(struct ocfs2_truncate_rec);
 989 }
 990
 991 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
 992 {
 993         u64 offset = OCFS2_BACKUP_SB_START;
 994
 995         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
 996                 offset <<= (2 * index);
 997                 offset >>= sb->s_blocksize_bits;
 998                 return offset;
 999         }
1000
1001         return 0;
1002
1003 }
1004
1005 static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
1006 {
1007         int size;
1008
1009         size = sb->s_blocksize -
1010                 offsetof(struct ocfs2_xattr_block,
1011                          xb_attrs.xb_root.xt_list.l_recs);
1012
1013         return size / sizeof(struct ocfs2_extent_rec);
1014 }
1015 #else
1016 static inline int ocfs2_fast_symlink_chars(int blocksize)
1017 {
1018         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1019 }
1020
1021 static inline int ocfs2_max_inline_data(int blocksize)
1022 {
1023         return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1024 }
1025
1026 static inline int ocfs2_extent_recs_per_inode(int blocksize)
1027 {
1028         int size;
1029
1030         size = blocksize -
1031                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1032
1033         return size / sizeof(struct ocfs2_extent_rec);
1034 }
1035
1036 static inline int ocfs2_chain_recs_per_inode(int blocksize)
1037 {
1038         int size;
1039
1040         size = blocksize -
1041                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1042
1043         return size / sizeof(struct ocfs2_chain_rec);
1044 }
1045
1046 static inline int ocfs2_extent_recs_per_eb(int blocksize)
1047 {
1048         int size;
1049
1050         size = blocksize -
1051                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
1052
1053         return size / sizeof(struct ocfs2_extent_rec);
1054 }
1055
1056 static inline int ocfs2_local_alloc_size(int blocksize)
1057 {
1058         int size;
1059
1060         size = blocksize -
1061                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1062
1063         return size;
1064 }
1065
1066 static inline int ocfs2_group_bitmap_size(int blocksize)
1067 {
1068         int size;
1069
1070         size = blocksize -
1071                 offsetof(struct ocfs2_group_desc, bg_bitmap);
1072
1073         return size;
1074 }
1075
1076 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1077 {
1078         int size;
1079
1080         size = blocksize -
1081                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1082
1083         return size / sizeof(struct ocfs2_truncate_rec);
1084 }
1085
1086 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1087 {
1088         uint64_t offset = OCFS2_BACKUP_SB_START;
1089
1090         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1091                 offset <<= (2 * index);
1092                 offset /= blocksize;
1093                 return offset;
1094         }
1095
1096         return 0;
1097 }
1098
1099 static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1100 {
1101         int size;
1102
1103         size = blocksize -
1104                 offsetof(struct ocfs2_xattr_block,
1105                          xb_attrs.xb_root.xt_list.l_recs);
1106
1107         return size / sizeof(struct ocfs2_extent_rec);
1108 }
1109 #endif  /* __KERNEL__ */
1110
1111
1112 static inline int ocfs2_system_inode_is_global(int type)
1113 {
1114         return ((type >= 0) &&
1115                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1116 }
1117
1118 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1119                                                   int type, int slot)
1120 {
1121         int chars;
1122
1123         /*
1124          * Global system inodes can only have one copy.  Everything
1125          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1126          * list has a copy per slot.
1127          */
1128         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
1129                 chars = snprintf(buf, len, "%s",
1130                                  ocfs2_system_inodes[type].si_name);
1131         else
1132                 chars = snprintf(buf, len,
1133                                  ocfs2_system_inodes[type].si_name,
1134                                  slot);
1135
1136         return chars;
1137 }
1138
1139 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1140                                     umode_t mode)
1141 {
1142         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1143 }
1144
1145 #endif  /* _OCFS2_FS_H */
1146