linux/fs/ocfs2/ocfs2_fs.h
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   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#define OCFS2_DIR_TRAILER_SIGNATURE     "DIRTRL1"
  69#define OCFS2_DX_ROOT_SIGNATURE         "DXDIR01"
  70#define OCFS2_DX_LEAF_SIGNATURE         "DXLEAF1"
  71#define OCFS2_REFCOUNT_BLOCK_SIGNATURE  "REFCNT1"
  72
  73/* Compatibility flags */
  74#define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
  75        ( OCFS2_SB(sb)->s_feature_compat & (mask) )
  76#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)                    \
  77        ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
  78#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)                     \
  79        ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
  80#define OCFS2_SET_COMPAT_FEATURE(sb,mask)                       \
  81        OCFS2_SB(sb)->s_feature_compat |= (mask)
  82#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)                    \
  83        OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
  84#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)                     \
  85        OCFS2_SB(sb)->s_feature_incompat |= (mask)
  86#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)                     \
  87        OCFS2_SB(sb)->s_feature_compat &= ~(mask)
  88#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                  \
  89        OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
  90#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)                   \
  91        OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
  92
  93#define OCFS2_FEATURE_COMPAT_SUPP       (OCFS2_FEATURE_COMPAT_BACKUP_SB \
  94                                         | OCFS2_FEATURE_COMPAT_JBD2_SB)
  95#define OCFS2_FEATURE_INCOMPAT_SUPP     (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
  96                                         | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
  97                                         | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
  98                                         | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
  99                                         | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
 100                                         | OCFS2_FEATURE_INCOMPAT_XATTR \
 101                                         | OCFS2_FEATURE_INCOMPAT_META_ECC \
 102                                         | OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
 103                                         | OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
 104                                         | OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG  \
 105                                         | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)
 106#define OCFS2_FEATURE_RO_COMPAT_SUPP    (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
 107                                         | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
 108                                         | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 109
 110/*
 111 * Heartbeat-only devices are missing journals and other files.  The
 112 * filesystem driver can't load them, but the library can.  Never put
 113 * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
 114 */
 115#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV    0x0002
 116
 117/*
 118 * tunefs sets this incompat flag before starting the resize and clears it
 119 * at the end. This flag protects users from inadvertently mounting the fs
 120 * after an aborted run without fsck-ing.
 121 */
 122#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004
 123
 124/* Used to denote a non-clustered volume */
 125#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT      0x0008
 126
 127/* Support for sparse allocation in b-trees */
 128#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC     0x0010
 129
 130/*
 131 * Tunefs sets this incompat flag before starting an operation which
 132 * would require cleanup on abort. This is done to protect users from
 133 * inadvertently mounting the fs after an aborted run without
 134 * fsck-ing.
 135 *
 136 * s_tunefs_flags on the super block describes precisely which
 137 * operations were in progress.
 138 */
 139#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG    0x0020
 140
 141/* Support for data packed into inode blocks */
 142#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA      0x0040
 143
 144/*
 145 * Support for alternate, userspace cluster stacks.  If set, the superblock
 146 * field s_cluster_info contains a tag for the alternate stack in use as
 147 * well as the name of the cluster being joined.
 148 * mount.ocfs2 must pass in a matching stack name.
 149 *
 150 * If not set, the classic stack will be used.  This is compatbile with
 151 * all older versions.
 152 */
 153#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK  0x0080
 154
 155/* Support for the extended slot map */
 156#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
 157
 158/* Support for extended attributes */
 159#define OCFS2_FEATURE_INCOMPAT_XATTR            0x0200
 160
 161/* Support for indexed directores */
 162#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS     0x0400
 163
 164/* Metadata checksum and error correction */
 165#define OCFS2_FEATURE_INCOMPAT_META_ECC         0x0800
 166
 167/* Refcount tree support */
 168#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE    0x1000
 169
 170/* Discontigous block groups */
 171#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG     0x2000
 172
 173/*
 174 * Incompat bit to indicate useable clusterinfo with stackflags for all
 175 * cluster stacks (userspace adnd o2cb). If this bit is set,
 176 * INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
 177 */
 178#define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO      0x4000
 179
 180/*
 181 * backup superblock flag is used to indicate that this volume
 182 * has backup superblocks.
 183 */
 184#define OCFS2_FEATURE_COMPAT_BACKUP_SB          0x0001
 185
 186/*
 187 * The filesystem will correctly handle journal feature bits.
 188 */
 189#define OCFS2_FEATURE_COMPAT_JBD2_SB            0x0002
 190
 191/*
 192 * Unwritten extents support.
 193 */
 194#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN       0x0001
 195
 196/*
 197 * Maintain quota information for this filesystem
 198 */
 199#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA        0x0002
 200#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA        0x0004
 201
 202/* The byte offset of the first backup block will be 1G.
 203 * The following will be 4G, 16G, 64G, 256G and 1T.
 204 */
 205#define OCFS2_BACKUP_SB_START                   1 << 30
 206
 207/* the max backup superblock nums */
 208#define OCFS2_MAX_BACKUP_SUPERBLOCKS    6
 209
 210/*
 211 * Flags on ocfs2_super_block.s_tunefs_flags
 212 */
 213#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT         0x0001  /* Removing slots */
 214
 215/*
 216 * Flags on ocfs2_dinode.i_flags
 217 */
 218#define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
 219#define OCFS2_UNUSED2_FL        (0x00000002)
 220#define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
 221#define OCFS2_UNUSED3_FL        (0x00000008)
 222/* System inode flags */
 223#define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
 224#define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
 225#define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
 226#define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
 227#define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
 228#define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
 229#define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 230#define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 231#define OCFS2_QUOTA_FL          (0x00001000)    /* Quota file */
 232
 233/*
 234 * Flags on ocfs2_dinode.i_dyn_features
 235 *
 236 * These can change much more often than i_flags. When adding flags,
 237 * keep in mind that i_dyn_features is only 16 bits wide.
 238 */
 239#define OCFS2_INLINE_DATA_FL    (0x0001)        /* Data stored in inode block */
 240#define OCFS2_HAS_XATTR_FL      (0x0002)
 241#define OCFS2_INLINE_XATTR_FL   (0x0004)
 242#define OCFS2_INDEXED_DIR_FL    (0x0008)
 243#define OCFS2_HAS_REFCOUNT_FL   (0x0010)
 244
 245/* Inode attributes, keep in sync with EXT2 */
 246#define OCFS2_SECRM_FL                  FS_SECRM_FL     /* Secure deletion */
 247#define OCFS2_UNRM_FL                   FS_UNRM_FL      /* Undelete */
 248#define OCFS2_COMPR_FL                  FS_COMPR_FL     /* Compress file */
 249#define OCFS2_SYNC_FL                   FS_SYNC_FL      /* Synchronous updates */
 250#define OCFS2_IMMUTABLE_FL              FS_IMMUTABLE_FL /* Immutable file */
 251#define OCFS2_APPEND_FL                 FS_APPEND_FL    /* writes to file may only append */
 252#define OCFS2_NODUMP_FL                 FS_NODUMP_FL    /* do not dump file */
 253#define OCFS2_NOATIME_FL                FS_NOATIME_FL   /* do not update atime */
 254/* Reserved for compression usage... */
 255#define OCFS2_DIRTY_FL                  FS_DIRTY_FL
 256#define OCFS2_COMPRBLK_FL               FS_COMPRBLK_FL  /* One or more compressed clusters */
 257#define OCFS2_NOCOMP_FL                 FS_NOCOMP_FL    /* Don't compress */
 258#define OCFS2_ECOMPR_FL                 FS_ECOMPR_FL    /* Compression error */
 259/* End compression flags --- maybe not all used */
 260#define OCFS2_BTREE_FL                  FS_BTREE_FL     /* btree format dir */
 261#define OCFS2_INDEX_FL                  FS_INDEX_FL     /* hash-indexed directory */
 262#define OCFS2_IMAGIC_FL                 FS_IMAGIC_FL    /* AFS directory */
 263#define OCFS2_JOURNAL_DATA_FL           FS_JOURNAL_DATA_FL /* Reserved for ext3 */
 264#define OCFS2_NOTAIL_FL                 FS_NOTAIL_FL    /* file tail should not be merged */
 265#define OCFS2_DIRSYNC_FL                FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
 266#define OCFS2_TOPDIR_FL                 FS_TOPDIR_FL    /* Top of directory hierarchies*/
 267#define OCFS2_RESERVED_FL               FS_RESERVED_FL  /* reserved for ext2 lib */
 268
 269#define OCFS2_FL_VISIBLE                FS_FL_USER_VISIBLE      /* User visible flags */
 270#define OCFS2_FL_MODIFIABLE             FS_FL_USER_MODIFIABLE   /* User modifiable flags */
 271
 272/*
 273 * Extent record flags (e_node.leaf.flags)
 274 */
 275#define OCFS2_EXT_UNWRITTEN             (0x01)  /* Extent is allocated but
 276                                                 * unwritten */
 277#define OCFS2_EXT_REFCOUNTED            (0x02)  /* Extent is reference
 278                                                 * counted in an associated
 279                                                 * refcount tree */
 280
 281/*
 282 * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 283 */
 284#define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 285
 286/*
 287 * superblock s_state flags
 288 */
 289#define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 290
 291/* Limit of space in ocfs2_dir_entry */
 292#define OCFS2_MAX_FILENAME_LEN          255
 293
 294/* Maximum slots on an ocfs2 file system */
 295#define OCFS2_MAX_SLOTS                 255
 296
 297/* Slot map indicator for an empty slot */
 298#define OCFS2_INVALID_SLOT              -1
 299
 300#define OCFS2_VOL_UUID_LEN              16
 301#define OCFS2_MAX_VOL_LABEL_LEN         64
 302
 303/* The cluster stack fields */
 304#define OCFS2_STACK_LABEL_LEN           4
 305#define OCFS2_CLUSTER_NAME_LEN          16
 306
 307/* Classic (historically speaking) cluster stack */
 308#define OCFS2_CLASSIC_CLUSTER_STACK     "o2cb"
 309
 310/* Journal limits (in bytes) */
 311#define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 312
 313/*
 314 * Inline extended attribute size (in bytes)
 315 * The value chosen should be aligned to 16 byte boundaries.
 316 */
 317#define OCFS2_MIN_XATTR_INLINE_SIZE     256
 318
 319/*
 320 * Cluster info flags (ocfs2_cluster_info.ci_stackflags)
 321 */
 322#define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT     (0x01)
 323
 324struct ocfs2_system_inode_info {
 325        char    *si_name;
 326        int     si_iflags;
 327        int     si_mode;
 328};
 329
 330/* System file index */
 331enum {
 332        BAD_BLOCK_SYSTEM_INODE = 0,
 333        GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 334        SLOT_MAP_SYSTEM_INODE,
 335#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 336        HEARTBEAT_SYSTEM_INODE,
 337        GLOBAL_BITMAP_SYSTEM_INODE,
 338        USER_QUOTA_SYSTEM_INODE,
 339        GROUP_QUOTA_SYSTEM_INODE,
 340#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
 341#define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_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#define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
 351        NUM_SYSTEM_INODES
 352};
 353#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
 354#define NUM_LOCAL_SYSTEM_INODES \
 355                (NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)
 356
 357static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 358        /* Global system inodes (single copy) */
 359        /* The first two are only used from userspace mfks/tunefs */
 360        [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 361        [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 362
 363        /* These are used by the running filesystem */
 364        [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 365        [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 366        [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 367        [USER_QUOTA_SYSTEM_INODE]               = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 368        [GROUP_QUOTA_SYSTEM_INODE]              = { "aquota.group", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 369
 370        /* Slot-specific system inodes (one copy per slot) */
 371        [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 372        [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 373        [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 374        [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 375        [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 376        [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 },
 377        [LOCAL_USER_QUOTA_SYSTEM_INODE]         = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 378        [LOCAL_GROUP_QUOTA_SYSTEM_INODE]        = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
 379};
 380
 381/* Parameter passed from mount.ocfs2 to module */
 382#define OCFS2_HB_NONE                   "heartbeat=none"
 383#define OCFS2_HB_LOCAL                  "heartbeat=local"
 384#define OCFS2_HB_GLOBAL                 "heartbeat=global"
 385
 386/*
 387 * OCFS2 directory file types.  Only the low 3 bits are used.  The
 388 * other bits are reserved for now.
 389 */
 390#define OCFS2_FT_UNKNOWN        0
 391#define OCFS2_FT_REG_FILE       1
 392#define OCFS2_FT_DIR            2
 393#define OCFS2_FT_CHRDEV         3
 394#define OCFS2_FT_BLKDEV         4
 395#define OCFS2_FT_FIFO           5
 396#define OCFS2_FT_SOCK           6
 397#define OCFS2_FT_SYMLINK        7
 398
 399#define OCFS2_FT_MAX            8
 400
 401/*
 402 * OCFS2_DIR_PAD defines the directory entries boundaries
 403 *
 404 * NOTE: It must be a multiple of 4
 405 */
 406#define OCFS2_DIR_PAD                   4
 407#define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 408#define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 409#define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 410                                          OCFS2_DIR_ROUND) & \
 411                                         ~OCFS2_DIR_ROUND)
 412#define OCFS2_DIR_MIN_REC_LEN   OCFS2_DIR_REC_LEN(1)
 413
 414#define OCFS2_LINK_MAX          32000
 415#define OCFS2_DX_LINK_MAX       ((1U << 31) - 1U)
 416#define OCFS2_LINKS_HI_SHIFT    16
 417#define OCFS2_DX_ENTRIES_MAX    (0xffffffffU)
 418
 419#define S_SHIFT                 12
 420static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 421        [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 422        [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 423        [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 424        [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 425        [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 426        [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 427        [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 428};
 429
 430
 431/*
 432 * Convenience casts
 433 */
 434#define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 435
 436/*
 437 * Block checking structure.  This is used in metadata to validate the
 438 * contents.  If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
 439 * zeros.
 440 */
 441struct ocfs2_block_check {
 442/*00*/  __le32 bc_crc32e;       /* 802.3 Ethernet II CRC32 */
 443        __le16 bc_ecc;          /* Single-error-correction parity vector.
 444                                   This is a simple Hamming code dependent
 445                                   on the blocksize.  OCFS2's maximum
 446                                   blocksize, 4K, requires 16 parity bits,
 447                                   so we fit in __le16. */
 448        __le16 bc_reserved1;
 449/*08*/
 450};
 451
 452/*
 453 * On disk extent record for OCFS2
 454 * It describes a range of clusters on disk.
 455 *
 456 * Length fields are divided into interior and leaf node versions.
 457 * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 458 */
 459struct ocfs2_extent_rec {
 460/*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 461        union {
 462                __le32 e_int_clusters; /* Clusters covered by all children */
 463                struct {
 464                        __le16 e_leaf_clusters; /* Clusters covered by this
 465                                                   extent */
 466                        __u8 e_reserved1;
 467                        __u8 e_flags; /* Extent flags */
 468                };
 469        };
 470        __le64 e_blkno;         /* Physical disk offset, in blocks */
 471/*10*/
 472};
 473
 474struct ocfs2_chain_rec {
 475        __le32 c_free;  /* Number of free bits in this chain. */
 476        __le32 c_total; /* Number of total bits in this chain */
 477        __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 478};
 479
 480struct ocfs2_truncate_rec {
 481        __le32 t_start;         /* 1st cluster in this log */
 482        __le32 t_clusters;      /* Number of total clusters covered */
 483};
 484
 485/*
 486 * On disk extent list for OCFS2 (node in the tree).  Note that this
 487 * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 488 * offsets are relative to ocfs2_dinode.id2.i_list or
 489 * ocfs2_extent_block.h_list, respectively.
 490 */
 491struct ocfs2_extent_list {
 492/*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 493                                           point.  0 means data extents
 494                                           hang directly off this
 495                                           header (a leaf)
 496                                           NOTE: The high 8 bits cannot be
 497                                           used - tree_depth is never that big.
 498                                        */
 499        __le16 l_count;                 /* Number of extent records */
 500        __le16 l_next_free_rec;         /* Next unused extent slot */
 501        __le16 l_reserved1;
 502        __le64 l_reserved2;             /* Pad to
 503                                           sizeof(ocfs2_extent_rec) */
 504/*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 505};
 506
 507/*
 508 * On disk allocation chain list for OCFS2.  Note that this is
 509 * contained inside ocfs2_dinode, so the offsets are relative to
 510 * ocfs2_dinode.id2.i_chain.
 511 */
 512struct ocfs2_chain_list {
 513/*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 514        __le16 cl_bpc;                  /* Bits per cluster */
 515        __le16 cl_count;                /* Total chains in this list */
 516        __le16 cl_next_free_rec;        /* Next unused chain slot */
 517        __le64 cl_reserved1;
 518/*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 519};
 520
 521/*
 522 * On disk deallocation log for OCFS2.  Note that this is
 523 * contained inside ocfs2_dinode, so the offsets are relative to
 524 * ocfs2_dinode.id2.i_dealloc.
 525 */
 526struct ocfs2_truncate_log {
 527/*00*/  __le16 tl_count;                /* Total records in this log */
 528        __le16 tl_used;                 /* Number of records in use */
 529        __le32 tl_reserved1;
 530/*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 531};
 532
 533/*
 534 * On disk extent block (indirect block) for OCFS2
 535 */
 536struct ocfs2_extent_block
 537{
 538/*00*/  __u8 h_signature[8];            /* Signature for verification */
 539        struct ocfs2_block_check h_check;       /* Error checking */
 540/*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 541                                           extent_header belongs to */
 542        __le16 h_suballoc_bit;          /* Bit offset in suballocator
 543                                           block group */
 544        __le32 h_fs_generation;         /* Must match super block */
 545        __le64 h_blkno;                 /* Offset on disk, in blocks */
 546/*20*/  __le64 h_suballoc_loc;          /* Suballocator block group this
 547                                           eb belongs to.  Only valid
 548                                           if allocated from a
 549                                           discontiguous block group */
 550        __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 551                                           of next leaf header pointing
 552                                           to data */
 553/*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 554/* Actual on-disk size is one block */
 555};
 556
 557/*
 558 * On disk slot map for OCFS2.  This defines the contents of the "slot_map"
 559 * system file.  A slot is valid if it contains a node number >= 0.  The
 560 * value -1 (0xFFFF) is OCFS2_INVALID_SLOT.  This marks a slot empty.
 561 */
 562struct ocfs2_slot_map {
 563/*00*/  __le16 sm_slots[0];
 564/*
 565 * Actual on-disk size is one block.  OCFS2_MAX_SLOTS is 255,
 566 * 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
 567 */
 568};
 569
 570struct ocfs2_extended_slot {
 571/*00*/  __u8    es_valid;
 572        __u8    es_reserved1[3];
 573        __le32  es_node_num;
 574/*10*/
 575};
 576
 577/*
 578 * The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
 579 * is set.  It separates out the valid marker from the node number, and
 580 * has room to grow.  Unlike the old slot map, this format is defined by
 581 * i_size.
 582 */
 583struct ocfs2_slot_map_extended {
 584/*00*/  struct ocfs2_extended_slot se_slots[0];
 585/*
 586 * Actual size is i_size of the slot_map system file.  It should
 587 * match s_max_slots * sizeof(struct ocfs2_extended_slot)
 588 */
 589};
 590
 591/*
 592 * ci_stackflags is only valid if the incompat bit
 593 * OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
 594 */
 595struct ocfs2_cluster_info {
 596/*00*/  __u8   ci_stack[OCFS2_STACK_LABEL_LEN];
 597        union {
 598                __le32 ci_reserved;
 599                struct {
 600                        __u8 ci_stackflags;
 601                        __u8 ci_reserved1;
 602                        __u8 ci_reserved2;
 603                        __u8 ci_reserved3;
 604                };
 605        };
 606/*08*/  __u8   ci_cluster[OCFS2_CLUSTER_NAME_LEN];
 607/*18*/
 608};
 609
 610/*
 611 * On disk superblock for OCFS2
 612 * Note that it is contained inside an ocfs2_dinode, so all offsets
 613 * are relative to the start of ocfs2_dinode.id2.
 614 */
 615struct ocfs2_super_block {
 616/*00*/  __le16 s_major_rev_level;
 617        __le16 s_minor_rev_level;
 618        __le16 s_mnt_count;
 619        __le16 s_max_mnt_count;
 620        __le16 s_state;                 /* File system state */
 621        __le16 s_errors;                        /* Behaviour when detecting errors */
 622        __le32 s_checkinterval;         /* Max time between checks */
 623/*10*/  __le64 s_lastcheck;             /* Time of last check */
 624        __le32 s_creator_os;            /* OS */
 625        __le32 s_feature_compat;                /* Compatible feature set */
 626/*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 627        __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 628        __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 629                                           dinode */
 630/*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 631                                           directory dinode */
 632        __le32 s_blocksize_bits;                /* Blocksize for this fs */
 633        __le32 s_clustersize_bits;      /* Clustersize for this fs */
 634/*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 635                                           before tunefs required */
 636        __le16 s_tunefs_flag;
 637        __le32 s_uuid_hash;             /* hash value of uuid */
 638        __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 639                                         * group header */
 640/*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 641/*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 642/*A0*/  struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
 643                                                     userspace or clusterinfo
 644                                                     INCOMPAT flag set. */
 645/*B8*/  __le16 s_xattr_inline_size;     /* extended attribute inline size
 646                                           for this fs*/
 647        __le16 s_reserved0;
 648        __le32 s_dx_seed[3];            /* seed[0-2] for dx dir hash.
 649                                         * s_uuid_hash serves as seed[3]. */
 650/*C0*/  __le64 s_reserved2[15];         /* Fill out superblock */
 651/*140*/
 652
 653        /*
 654         * NOTE: As stated above, all offsets are relative to
 655         * ocfs2_dinode.id2, which is at 0xC0 in the inode.
 656         * 0xC0 + 0x140 = 0x200 or 512 bytes.  A superblock must fit within
 657         * our smallest blocksize, which is 512 bytes.  To ensure this,
 658         * we reserve the space in s_reserved2.  Anything past s_reserved2
 659         * will not be available on the smallest blocksize.
 660         */
 661};
 662
 663/*
 664 * Local allocation bitmap for OCFS2 slots
 665 * Note that it exists inside an ocfs2_dinode, so all offsets are
 666 * relative to the start of ocfs2_dinode.id2.
 667 */
 668struct ocfs2_local_alloc
 669{
 670/*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 671        __le16 la_size;         /* Size of included bitmap, in bytes */
 672        __le16 la_reserved1;
 673        __le64 la_reserved2;
 674/*10*/  __u8   la_bitmap[0];
 675};
 676
 677/*
 678 * Data-in-inode header. This is only used if i_dyn_features has
 679 * OCFS2_INLINE_DATA_FL set.
 680 */
 681struct ocfs2_inline_data
 682{
 683/*00*/  __le16  id_count;       /* Number of bytes that can be used
 684                                 * for data, starting at id_data */
 685        __le16  id_reserved0;
 686        __le32  id_reserved1;
 687        __u8    id_data[0];     /* Start of user data */
 688};
 689
 690/*
 691 * On disk inode for OCFS2
 692 */
 693struct ocfs2_dinode {
 694/*00*/  __u8 i_signature[8];            /* Signature for validation */
 695        __le32 i_generation;            /* Generation number */
 696        __le16 i_suballoc_slot;         /* Slot suballocator this inode
 697                                           belongs to */
 698        __le16 i_suballoc_bit;          /* Bit offset in suballocator
 699                                           block group */
 700/*10*/  __le16 i_links_count_hi;        /* High 16 bits of links count */
 701        __le16 i_xattr_inline_size;
 702        __le32 i_clusters;              /* Cluster count */
 703        __le32 i_uid;                   /* Owner UID */
 704        __le32 i_gid;                   /* Owning GID */
 705/*20*/  __le64 i_size;                  /* Size in bytes */
 706        __le16 i_mode;                  /* File mode */
 707        __le16 i_links_count;           /* Links count */
 708        __le32 i_flags;                 /* File flags */
 709/*30*/  __le64 i_atime;                 /* Access time */
 710        __le64 i_ctime;                 /* Creation time */
 711/*40*/  __le64 i_mtime;                 /* Modification time */
 712        __le64 i_dtime;                 /* Deletion time */
 713/*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 714        __le64 i_last_eb_blk;           /* Pointer to last extent
 715                                           block */
 716/*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 717        __le32 i_atime_nsec;
 718        __le32 i_ctime_nsec;
 719        __le32 i_mtime_nsec;
 720/*70*/  __le32 i_attr;
 721        __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
 722                                           was set in i_flags */
 723        __le16 i_dyn_features;
 724        __le64 i_xattr_loc;
 725/*80*/  struct ocfs2_block_check i_check;       /* Error checking */
 726/*88*/  __le64 i_dx_root;               /* Pointer to dir index root block */
 727/*90*/  __le64 i_refcount_loc;
 728        __le64 i_suballoc_loc;          /* Suballocator block group this
 729                                           inode belongs to.  Only valid
 730                                           if allocated from a
 731                                           discontiguous block group */
 732/*A0*/  __le64 i_reserved2[3];
 733/*B8*/  union {
 734                __le64 i_pad1;          /* Generic way to refer to this
 735                                           64bit union */
 736                struct {
 737                        __le64 i_rdev;  /* Device number */
 738                } dev1;
 739                struct {                /* Info for bitmap system
 740                                           inodes */
 741                        __le32 i_used;  /* Bits (ie, clusters) used  */
 742                        __le32 i_total; /* Total bits (clusters)
 743                                           available */
 744                } bitmap1;
 745                struct {                /* Info for journal system
 746                                           inodes */
 747                        __le32 ij_flags;        /* Mounted, version, etc. */
 748                        __le32 ij_recovery_generation; /* Incremented when the
 749                                                          journal is recovered
 750                                                          after an unclean
 751                                                          shutdown */
 752                } journal1;
 753        } id1;                          /* Inode type dependent 1 */
 754/*C0*/  union {
 755                struct ocfs2_super_block        i_super;
 756                struct ocfs2_local_alloc        i_lab;
 757                struct ocfs2_chain_list         i_chain;
 758                struct ocfs2_extent_list        i_list;
 759                struct ocfs2_truncate_log       i_dealloc;
 760                struct ocfs2_inline_data        i_data;
 761                __u8                            i_symlink[0];
 762        } id2;
 763/* Actual on-disk size is one block */
 764};
 765
 766/*
 767 * On-disk directory entry structure for OCFS2
 768 *
 769 * Packed as this structure could be accessed unaligned on 64-bit platforms
 770 */
 771struct ocfs2_dir_entry {
 772/*00*/  __le64   inode;                  /* Inode number */
 773        __le16   rec_len;                /* Directory entry length */
 774        __u8    name_len;               /* Name length */
 775        __u8    file_type;
 776/*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 777/* Actual on-disk length specified by rec_len */
 778} __attribute__ ((packed));
 779
 780/*
 781 * Per-block record for the unindexed directory btree. This is carefully
 782 * crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
 783 * mirrored. That way, the directory manipulation code needs a minimal amount
 784 * of update.
 785 *
 786 * NOTE: Keep this structure aligned to a multiple of 4 bytes.
 787 */
 788struct ocfs2_dir_block_trailer {
 789/*00*/  __le64          db_compat_inode;        /* Always zero. Was inode */
 790
 791        __le16          db_compat_rec_len;      /* Backwards compatible with
 792                                                 * ocfs2_dir_entry. */
 793        __u8            db_compat_name_len;     /* Always zero. Was name_len */
 794        __u8            db_reserved0;
 795        __le16          db_reserved1;
 796        __le16          db_free_rec_len;        /* Size of largest empty hole
 797                                                 * in this block. (unused) */
 798/*10*/  __u8            db_signature[8];        /* Signature for verification */
 799        __le64          db_reserved2;
 800        __le64          db_free_next;           /* Next block in list (unused) */
 801/*20*/  __le64          db_blkno;               /* Offset on disk, in blocks */
 802        __le64          db_parent_dinode;       /* dinode which owns me, in
 803                                                   blocks */
 804/*30*/  struct ocfs2_block_check db_check;      /* Error checking */
 805/*40*/
 806};
 807
 808 /*
 809 * A directory entry in the indexed tree. We don't store the full name here,
 810 * but instead provide a pointer to the full dirent in the unindexed tree.
 811 *
 812 * We also store name_len here so as to reduce the number of leaf blocks we
 813 * need to search in case of collisions.
 814 */
 815struct ocfs2_dx_entry {
 816        __le32          dx_major_hash;  /* Used to find logical
 817                                         * cluster in index */
 818        __le32          dx_minor_hash;  /* Lower bits used to find
 819                                         * block in cluster */
 820        __le64          dx_dirent_blk;  /* Physical block in unindexed
 821                                         * tree holding this dirent. */
 822};
 823
 824struct ocfs2_dx_entry_list {
 825        __le32          de_reserved;
 826        __le16          de_count;       /* Maximum number of entries
 827                                         * possible in de_entries */
 828        __le16          de_num_used;    /* Current number of
 829                                         * de_entries entries */
 830        struct  ocfs2_dx_entry          de_entries[0];  /* Indexed dir entries
 831                                                         * in a packed array of
 832                                                         * length de_num_used */
 833};
 834
 835#define OCFS2_DX_FLAG_INLINE    0x01
 836
 837/*
 838 * A directory indexing block. Each indexed directory has one of these,
 839 * pointed to by ocfs2_dinode.
 840 *
 841 * This block stores an indexed btree root, and a set of free space
 842 * start-of-list pointers.
 843 */
 844struct ocfs2_dx_root_block {
 845        __u8            dr_signature[8];        /* Signature for verification */
 846        struct ocfs2_block_check dr_check;      /* Error checking */
 847        __le16          dr_suballoc_slot;       /* Slot suballocator this
 848                                                 * block belongs to. */
 849        __le16          dr_suballoc_bit;        /* Bit offset in suballocator
 850                                                 * block group */
 851        __le32          dr_fs_generation;       /* Must match super block */
 852        __le64          dr_blkno;               /* Offset on disk, in blocks */
 853        __le64          dr_last_eb_blk;         /* Pointer to last
 854                                                 * extent block */
 855        __le32          dr_clusters;            /* Clusters allocated
 856                                                 * to the indexed tree. */
 857        __u8            dr_flags;               /* OCFS2_DX_FLAG_* flags */
 858        __u8            dr_reserved0;
 859        __le16          dr_reserved1;
 860        __le64          dr_dir_blkno;           /* Pointer to parent inode */
 861        __le32          dr_num_entries;         /* Total number of
 862                                                 * names stored in
 863                                                 * this directory.*/
 864        __le32          dr_reserved2;
 865        __le64          dr_free_blk;            /* Pointer to head of free
 866                                                 * unindexed block list. */
 867        __le64          dr_suballoc_loc;        /* Suballocator block group
 868                                                   this root belongs to.
 869                                                   Only valid if allocated
 870                                                   from a discontiguous
 871                                                   block group */
 872        __le64          dr_reserved3[14];
 873        union {
 874                struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
 875                                                   * bits for maximum space
 876                                                   * efficiency. */
 877                struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
 878                                                        * entries. We grow out
 879                                                        * to extents if this
 880                                                        * gets too big. */
 881        };
 882};
 883
 884/*
 885 * The header of a leaf block in the indexed tree.
 886 */
 887struct ocfs2_dx_leaf {
 888        __u8            dl_signature[8];/* Signature for verification */
 889        struct ocfs2_block_check dl_check;      /* Error checking */
 890        __le64          dl_blkno;       /* Offset on disk, in blocks */
 891        __le32          dl_fs_generation;/* Must match super block */
 892        __le32          dl_reserved0;
 893        __le64          dl_reserved1;
 894        struct ocfs2_dx_entry_list      dl_list;
 895};
 896
 897/*
 898 * Largest bitmap for a block (suballocator) group in bytes.  This limit
 899 * does not affect cluster groups (global allocator).  Cluster group
 900 * bitmaps run to the end of the block.
 901 */
 902#define OCFS2_MAX_BG_BITMAP_SIZE        256
 903
 904/*
 905 * On disk allocator group structure for OCFS2
 906 */
 907struct ocfs2_group_desc
 908{
 909/*00*/  __u8    bg_signature[8];        /* Signature for validation */
 910        __le16   bg_size;                /* Size of included bitmap in
 911                                           bytes. */
 912        __le16   bg_bits;                /* Bits represented by this
 913                                           group. */
 914        __le16  bg_free_bits_count;     /* Free bits count */
 915        __le16   bg_chain;               /* What chain I am in. */
 916/*10*/  __le32   bg_generation;
 917        __le32  bg_reserved1;
 918        __le64   bg_next_group;          /* Next group in my list, in
 919                                           blocks */
 920/*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 921                                           blocks */
 922        __le64   bg_blkno;               /* Offset on disk, in blocks */
 923/*30*/  struct ocfs2_block_check bg_check;      /* Error checking */
 924        __le64   bg_reserved2;
 925/*40*/  union {
 926                __u8    bg_bitmap[0];
 927                struct {
 928                        /*
 929                         * Block groups may be discontiguous when
 930                         * OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
 931                         * The extents of a discontigous block group are
 932                         * stored in bg_list.  It is a flat list.
 933                         * l_tree_depth must always be zero.  A
 934                         * discontiguous group is signified by a non-zero
 935                         * bg_list->l_next_free_rec.  Only block groups
 936                         * can be discontiguous; Cluster groups cannot.
 937                         * We've never made a block group with more than
 938                         * 2048 blocks (256 bytes of bg_bitmap).  This
 939                         * codifies that limit so that we can fit bg_list.
 940                         * bg_size of a discontiguous block group will
 941                         * be 256 to match bg_bitmap_filler.
 942                         */
 943                        __u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
 944/*140*/                 struct ocfs2_extent_list bg_list;
 945                };
 946        };
 947/* Actual on-disk size is one block */
 948};
 949
 950struct ocfs2_refcount_rec {
 951/*00*/  __le64 r_cpos;          /* Physical offset, in clusters */
 952        __le32 r_clusters;      /* Clusters covered by this extent */
 953        __le32 r_refcount;      /* Reference count of this extent */
 954/*10*/
 955};
 956#define OCFS2_32BIT_POS_MASK            (0xffffffffULL)
 957
 958#define OCFS2_REFCOUNT_LEAF_FL          (0x00000001)
 959#define OCFS2_REFCOUNT_TREE_FL          (0x00000002)
 960
 961struct ocfs2_refcount_list {
 962/*00*/  __le16 rl_count;        /* Maximum number of entries possible
 963                                   in rl_records */
 964        __le16 rl_used;         /* Current number of used records */
 965        __le32 rl_reserved2;
 966        __le64 rl_reserved1;    /* Pad to sizeof(ocfs2_refcount_record) */
 967/*10*/  struct ocfs2_refcount_rec rl_recs[0];   /* Refcount records */
 968};
 969
 970
 971struct ocfs2_refcount_block {
 972/*00*/  __u8 rf_signature[8];           /* Signature for verification */
 973        __le16 rf_suballoc_slot;        /* Slot suballocator this block
 974                                           belongs to */
 975        __le16 rf_suballoc_bit;         /* Bit offset in suballocator
 976                                           block group */
 977        __le32 rf_fs_generation;        /* Must match superblock */
 978/*10*/  __le64 rf_blkno;                /* Offset on disk, in blocks */
 979        __le64 rf_parent;               /* Parent block, only valid if
 980                                           OCFS2_REFCOUNT_LEAF_FL is set in
 981                                           rf_flags */
 982/*20*/  struct ocfs2_block_check rf_check;      /* Error checking */
 983        __le64 rf_last_eb_blk;          /* Pointer to last extent block */
 984/*30*/  __le32 rf_count;                /* Number of inodes sharing this
 985                                           refcount tree */
 986        __le32 rf_flags;                /* See the flags above */
 987        __le32 rf_clusters;             /* clusters covered by refcount tree. */
 988        __le32 rf_cpos;                 /* cluster offset in refcount tree.*/
 989/*40*/  __le32 rf_generation;           /* generation number. all be the same
 990                                         * for the same refcount tree. */
 991        __le32 rf_reserved0;
 992        __le64 rf_suballoc_loc;         /* Suballocator block group this
 993                                           refcount block belongs to. Only
 994                                           valid if allocated from a
 995                                           discontiguous block group */
 996/*50*/  __le64 rf_reserved1[6];
 997/*80*/  union {
 998                struct ocfs2_refcount_list rf_records;  /* List of refcount
 999                                                          records */
1000                struct ocfs2_extent_list rf_list;       /* Extent record list,
1001                                                        only valid if
1002                                                        OCFS2_REFCOUNT_TREE_FL
1003                                                        is set in rf_flags */
1004        };
1005/* Actual on-disk size is one block */
1006};
1007
1008/*
1009 * On disk extended attribute structure for OCFS2.
1010 */
1011
1012/*
1013 * ocfs2_xattr_entry indicates one extend attribute.
1014 *
1015 * Note that it can be stored in inode, one block or one xattr bucket.
1016 */
1017struct ocfs2_xattr_entry {
1018        __le32  xe_name_hash;    /* hash value of xattr prefix+suffix. */
1019        __le16  xe_name_offset;  /* byte offset from the 1st entry in the
1020                                    local xattr storage(inode, xattr block or
1021                                    xattr bucket). */
1022        __u8    xe_name_len;     /* xattr name len, doesn't include prefix. */
1023        __u8    xe_type;         /* the low 7 bits indicate the name prefix
1024                                  * type and the highest bit indicates whether
1025                                  * the EA is stored in the local storage. */
1026        __le64  xe_value_size;   /* real xattr value length. */
1027};
1028
1029/*
1030 * On disk structure for xattr header.
1031 *
1032 * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
1033 * the local xattr storage.
1034 */
1035struct ocfs2_xattr_header {
1036        __le16  xh_count;                       /* contains the count of how
1037                                                   many records are in the
1038                                                   local xattr storage. */
1039        __le16  xh_free_start;                  /* current offset for storing
1040                                                   xattr. */
1041        __le16  xh_name_value_len;              /* total length of name/value
1042                                                   length in this bucket. */
1043        __le16  xh_num_buckets;                 /* Number of xattr buckets
1044                                                   in this extent record,
1045                                                   only valid in the first
1046                                                   bucket. */
1047        struct ocfs2_block_check xh_check;      /* Error checking
1048                                                   (Note, this is only
1049                                                    used for xattr
1050                                                    buckets.  A block uses
1051                                                    xb_check and sets
1052                                                    this field to zero.) */
1053        struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
1054};
1055
1056/*
1057 * On disk structure for xattr value root.
1058 *
1059 * When an xattr's value is large enough, it is stored in an external
1060 * b-tree like file data.  The xattr value root points to this structure.
1061 */
1062struct ocfs2_xattr_value_root {
1063/*00*/  __le32  xr_clusters;              /* clusters covered by xattr value. */
1064        __le32  xr_reserved0;
1065        __le64  xr_last_eb_blk;           /* Pointer to last extent block */
1066/*10*/  struct ocfs2_extent_list xr_list; /* Extent record list */
1067};
1068
1069/*
1070 * On disk structure for xattr tree root.
1071 *
1072 * It is used when there are too many extended attributes for one file. These
1073 * attributes will be organized and stored in an indexed-btree.
1074 */
1075struct ocfs2_xattr_tree_root {
1076/*00*/  __le32  xt_clusters;              /* clusters covered by xattr. */
1077        __le32  xt_reserved0;
1078        __le64  xt_last_eb_blk;           /* Pointer to last extent block */
1079/*10*/  struct ocfs2_extent_list xt_list; /* Extent record list */
1080};
1081
1082#define OCFS2_XATTR_INDEXED     0x1
1083#define OCFS2_HASH_SHIFT        5
1084#define OCFS2_XATTR_ROUND       3
1085#define OCFS2_XATTR_SIZE(size)  (((size) + OCFS2_XATTR_ROUND) & \
1086                                ~(OCFS2_XATTR_ROUND))
1087
1088#define OCFS2_XATTR_BUCKET_SIZE                 4096
1089#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET       (OCFS2_XATTR_BUCKET_SIZE \
1090                                                 / OCFS2_MIN_BLOCKSIZE)
1091
1092/*
1093 * On disk structure for xattr block.
1094 */
1095struct ocfs2_xattr_block {
1096/*00*/  __u8    xb_signature[8];     /* Signature for verification */
1097        __le16  xb_suballoc_slot;    /* Slot suballocator this
1098                                        block belongs to. */
1099        __le16  xb_suballoc_bit;     /* Bit offset in suballocator
1100                                        block group */
1101        __le32  xb_fs_generation;    /* Must match super block */
1102/*10*/  __le64  xb_blkno;            /* Offset on disk, in blocks */
1103        struct ocfs2_block_check xb_check;      /* Error checking */
1104/*20*/  __le16  xb_flags;            /* Indicates whether this block contains
1105                                        real xattr or a xattr tree. */
1106        __le16  xb_reserved0;
1107        __le32  xb_reserved1;
1108        __le64  xb_suballoc_loc;        /* Suballocator block group this
1109                                           xattr block belongs to. Only
1110                                           valid if allocated from a
1111                                           discontiguous block group */
1112/*30*/  union {
1113                struct ocfs2_xattr_header xb_header; /* xattr header if this
1114                                                        block contains xattr */
1115                struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
1116                                                        block cotains xattr
1117                                                        tree. */
1118        } xb_attrs;
1119};
1120
1121#define OCFS2_XATTR_ENTRY_LOCAL         0x80
1122#define OCFS2_XATTR_TYPE_MASK           0x7F
1123static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
1124                                         int local)
1125{
1126        if (local)
1127                xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
1128        else
1129                xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
1130}
1131
1132static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
1133{
1134        return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
1135}
1136
1137static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
1138{
1139        xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
1140}
1141
1142static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
1143{
1144        return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
1145}
1146
1147/*
1148 *  On disk structures for global quota file
1149 */
1150
1151/* Magic numbers and known versions for global quota files */
1152#define OCFS2_GLOBAL_QMAGICS {\
1153        0x0cf52470, /* USRQUOTA */ \
1154        0x0cf52471  /* GRPQUOTA */ \
1155}
1156
1157#define OCFS2_GLOBAL_QVERSIONS {\
1158        0, \
1159        0, \
1160}
1161
1162
1163/* Each block of each quota file has a certain fixed number of bytes reserved
1164 * for OCFS2 internal use at its end. OCFS2 can use it for things like
1165 * checksums, etc. */
1166#define OCFS2_QBLK_RESERVED_SPACE 8
1167
1168/* Generic header of all quota files */
1169struct ocfs2_disk_dqheader {
1170        __le32 dqh_magic;       /* Magic number identifying file */
1171        __le32 dqh_version;     /* Quota format version */
1172};
1173
1174#define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1175
1176/* Information header of global quota file (immediately follows the generic
1177 * header) */
1178struct ocfs2_global_disk_dqinfo {
1179/*00*/  __le32 dqi_bgrace;      /* Grace time for space softlimit excess */
1180        __le32 dqi_igrace;      /* Grace time for inode softlimit excess */
1181        __le32 dqi_syncms;      /* Time after which we sync local changes to
1182                                 * global quota file */
1183        __le32 dqi_blocks;      /* Number of blocks in quota file */
1184/*10*/  __le32 dqi_free_blk;    /* First free block in quota file */
1185        __le32 dqi_free_entry;  /* First block with free dquot entry in quota
1186                                 * file */
1187};
1188
1189/* Structure with global user / group information. We reserve some space
1190 * for future use. */
1191struct ocfs2_global_disk_dqblk {
1192/*00*/  __le32 dqb_id;          /* ID the structure belongs to */
1193        __le32 dqb_use_count;   /* Number of nodes having reference to this structure */
1194        __le64 dqb_ihardlimit;  /* absolute limit on allocated inodes */
1195/*10*/  __le64 dqb_isoftlimit;  /* preferred inode limit */
1196        __le64 dqb_curinodes;   /* current # allocated inodes */
1197/*20*/  __le64 dqb_bhardlimit;  /* absolute limit on disk space */
1198        __le64 dqb_bsoftlimit;  /* preferred limit on disk space */
1199/*30*/  __le64 dqb_curspace;    /* current space occupied */
1200        __le64 dqb_btime;       /* time limit for excessive disk use */
1201/*40*/  __le64 dqb_itime;       /* time limit for excessive inode use */
1202        __le64 dqb_pad1;
1203/*50*/  __le64 dqb_pad2;
1204};
1205
1206/*
1207 *  On-disk structures for local quota file
1208 */
1209
1210/* Magic numbers and known versions for local quota files */
1211#define OCFS2_LOCAL_QMAGICS {\
1212        0x0cf524c0, /* USRQUOTA */ \
1213        0x0cf524c1  /* GRPQUOTA */ \
1214}
1215
1216#define OCFS2_LOCAL_QVERSIONS {\
1217        0, \
1218        0, \
1219}
1220
1221/* Quota flags in dqinfo header */
1222#define OLQF_CLEAN      0x0001  /* Quota file is empty (this should be after\
1223                                 * quota has been cleanly turned off) */
1224
1225#define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
1226
1227/* Information header of local quota file (immediately follows the generic
1228 * header) */
1229struct ocfs2_local_disk_dqinfo {
1230        __le32 dqi_flags;       /* Flags for quota file */
1231        __le32 dqi_chunks;      /* Number of chunks of quota structures
1232                                 * with a bitmap */
1233        __le32 dqi_blocks;      /* Number of blocks allocated for quota file */
1234};
1235
1236/* Header of one chunk of a quota file */
1237struct ocfs2_local_disk_chunk {
1238        __le32 dqc_free;        /* Number of free entries in the bitmap */
1239        __u8 dqc_bitmap[0];     /* Bitmap of entries in the corresponding
1240                                 * chunk of quota file */
1241};
1242
1243/* One entry in local quota file */
1244struct ocfs2_local_disk_dqblk {
1245/*00*/  __le64 dqb_id;          /* id this quota applies to */
1246        __le64 dqb_spacemod;    /* Change in the amount of used space */
1247/*10*/  __le64 dqb_inodemod;    /* Change in the amount of used inodes */
1248};
1249
1250
1251/*
1252 * The quota trailer lives at the end of each quota block.
1253 */
1254
1255struct ocfs2_disk_dqtrailer {
1256/*00*/  struct ocfs2_block_check dq_check;      /* Error checking */
1257/*08*/  /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
1258};
1259
1260static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
1261                                                                 void *buf)
1262{
1263        char *ptr = buf;
1264        ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
1265
1266        return (struct ocfs2_disk_dqtrailer *)ptr;
1267}
1268
1269#ifdef __KERNEL__
1270static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
1271{
1272        return  sb->s_blocksize -
1273                 offsetof(struct ocfs2_dinode, id2.i_symlink);
1274}
1275
1276static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
1277                                                   struct ocfs2_dinode *di)
1278{
1279        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1280
1281        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1282                return sb->s_blocksize -
1283                        offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1284                        xattrsize;
1285        else
1286                return sb->s_blocksize -
1287                        offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1288}
1289
1290static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
1291{
1292        int size;
1293
1294        size = sb->s_blocksize -
1295                offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1296
1297        return size / sizeof(struct ocfs2_extent_rec);
1298}
1299
1300static inline int ocfs2_extent_recs_per_inode_with_xattr(
1301                                                struct super_block *sb,
1302                                                struct ocfs2_dinode *di)
1303{
1304        int size;
1305        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
1306
1307        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
1308                size = sb->s_blocksize -
1309                        offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
1310                        xattrsize;
1311        else
1312                size = sb->s_blocksize -
1313                        offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1314
1315        return size / sizeof(struct ocfs2_extent_rec);
1316}
1317
1318static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
1319{
1320        int size;
1321
1322        size = sb->s_blocksize -
1323                offsetof(struct ocfs2_dx_root_block, dr_list.l_recs);
1324
1325        return size / sizeof(struct ocfs2_extent_rec);
1326}
1327
1328static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
1329{
1330        int size;
1331
1332        size = sb->s_blocksize -
1333                offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1334
1335        return size / sizeof(struct ocfs2_chain_rec);
1336}
1337
1338static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
1339{
1340        int size;
1341
1342        size = sb->s_blocksize -
1343                offsetof(struct ocfs2_extent_block, h_list.l_recs);
1344
1345        return size / sizeof(struct ocfs2_extent_rec);
1346}
1347
1348static inline u16 ocfs2_extent_recs_per_gd(struct super_block *sb)
1349{
1350        int size;
1351
1352        size = sb->s_blocksize -
1353                offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1354
1355        return size / sizeof(struct ocfs2_extent_rec);
1356}
1357
1358static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
1359{
1360        int size;
1361
1362        size = sb->s_blocksize -
1363                offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
1364
1365        return size / sizeof(struct ocfs2_dx_entry);
1366}
1367
1368static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
1369{
1370        int size;
1371
1372        size = sb->s_blocksize -
1373                offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
1374
1375        return size / sizeof(struct ocfs2_dx_entry);
1376}
1377
1378static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
1379{
1380        u16 size;
1381
1382        size = sb->s_blocksize -
1383                offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1384
1385        return size;
1386}
1387
1388static inline int ocfs2_group_bitmap_size(struct super_block *sb,
1389                                          int suballocator,
1390                                          u32 feature_incompat)
1391{
1392        int size = sb->s_blocksize -
1393                offsetof(struct ocfs2_group_desc, bg_bitmap);
1394
1395        /*
1396         * The cluster allocator uses the entire block.  Suballocators have
1397         * never used more than OCFS2_MAX_BG_BITMAP_SIZE.  Unfortunately, older
1398         * code expects bg_size set to the maximum.  Thus we must keep
1399         * bg_size as-is unless discontig_bg is enabled.
1400         */
1401        if (suballocator &&
1402            (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
1403                size = OCFS2_MAX_BG_BITMAP_SIZE;
1404
1405        return size;
1406}
1407
1408static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
1409{
1410        int size;
1411
1412        size = sb->s_blocksize -
1413                offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1414
1415        return size / sizeof(struct ocfs2_truncate_rec);
1416}
1417
1418static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
1419{
1420        u64 offset = OCFS2_BACKUP_SB_START;
1421
1422        if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1423                offset <<= (2 * index);
1424                offset >>= sb->s_blocksize_bits;
1425                return offset;
1426        }
1427
1428        return 0;
1429
1430}
1431
1432static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
1433{
1434        int size;
1435
1436        size = sb->s_blocksize -
1437                offsetof(struct ocfs2_xattr_block,
1438                         xb_attrs.xb_root.xt_list.l_recs);
1439
1440        return size / sizeof(struct ocfs2_extent_rec);
1441}
1442
1443static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
1444{
1445        int size;
1446
1447        size = sb->s_blocksize -
1448                offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
1449
1450        return size / sizeof(struct ocfs2_extent_rec);
1451}
1452
1453static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
1454{
1455        int size;
1456
1457        size = sb->s_blocksize -
1458                offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
1459
1460        return size / sizeof(struct ocfs2_refcount_rec);
1461}
1462
1463static inline u32
1464ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
1465{
1466        return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1467}
1468#else
1469static inline int ocfs2_fast_symlink_chars(int blocksize)
1470{
1471        return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
1472}
1473
1474static inline int ocfs2_max_inline_data_with_xattr(int blocksize,
1475                                                   struct ocfs2_dinode *di)
1476{
1477        if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
1478                return blocksize -
1479                        offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
1480                        di->i_xattr_inline_size;
1481        else
1482                return blocksize -
1483                        offsetof(struct ocfs2_dinode, id2.i_data.id_data);
1484}
1485
1486static inline int ocfs2_extent_recs_per_inode(int blocksize)
1487{
1488        int size;
1489
1490        size = blocksize -
1491                offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
1492
1493        return size / sizeof(struct ocfs2_extent_rec);
1494}
1495
1496static inline int ocfs2_chain_recs_per_inode(int blocksize)
1497{
1498        int size;
1499
1500        size = blocksize -
1501                offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
1502
1503        return size / sizeof(struct ocfs2_chain_rec);
1504}
1505
1506static inline int ocfs2_extent_recs_per_eb(int blocksize)
1507{
1508        int size;
1509
1510        size = blocksize -
1511                offsetof(struct ocfs2_extent_block, h_list.l_recs);
1512
1513        return size / sizeof(struct ocfs2_extent_rec);
1514}
1515
1516static inline int ocfs2_extent_recs_per_gd(int blocksize)
1517{
1518        int size;
1519
1520        size = blocksize -
1521                offsetof(struct ocfs2_group_desc, bg_list.l_recs);
1522
1523        return size / sizeof(struct ocfs2_extent_rec);
1524}
1525
1526static inline int ocfs2_local_alloc_size(int blocksize)
1527{
1528        int size;
1529
1530        size = blocksize -
1531                offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
1532
1533        return size;
1534}
1535
1536static inline int ocfs2_group_bitmap_size(int blocksize,
1537                                          int suballocator,
1538                                          uint32_t feature_incompat)
1539{
1540        int size = sb->s_blocksize -
1541                offsetof(struct ocfs2_group_desc, bg_bitmap);
1542
1543        /*
1544         * The cluster allocator uses the entire block.  Suballocators have
1545         * never used more than OCFS2_MAX_BG_BITMAP_SIZE.  Unfortunately, older
1546         * code expects bg_size set to the maximum.  Thus we must keep
1547         * bg_size as-is unless discontig_bg is enabled.
1548         */
1549        if (suballocator &&
1550            (feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
1551                size = OCFS2_MAX_BG_BITMAP_SIZE;
1552
1553        return size;
1554}
1555
1556static inline int ocfs2_truncate_recs_per_inode(int blocksize)
1557{
1558        int size;
1559
1560        size = blocksize -
1561                offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
1562
1563        return size / sizeof(struct ocfs2_truncate_rec);
1564}
1565
1566static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
1567{
1568        uint64_t offset = OCFS2_BACKUP_SB_START;
1569
1570        if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
1571                offset <<= (2 * index);
1572                offset /= blocksize;
1573                return offset;
1574        }
1575
1576        return 0;
1577}
1578
1579static inline int ocfs2_xattr_recs_per_xb(int blocksize)
1580{
1581        int size;
1582
1583        size = blocksize -
1584                offsetof(struct ocfs2_xattr_block,
1585                         xb_attrs.xb_root.xt_list.l_recs);
1586
1587        return size / sizeof(struct ocfs2_extent_rec);
1588}
1589#endif  /* __KERNEL__ */
1590
1591
1592static inline int ocfs2_system_inode_is_global(int type)
1593{
1594        return ((type >= 0) &&
1595                (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
1596}
1597
1598static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
1599                                                  int type, int slot)
1600{
1601        int chars;
1602
1603        /*
1604         * Global system inodes can only have one copy.  Everything
1605         * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
1606         * list has a copy per slot.
1607         */
1608        if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
1609                chars = snprintf(buf, len, "%s",
1610                                 ocfs2_system_inodes[type].si_name);
1611        else
1612                chars = snprintf(buf, len,
1613                                 ocfs2_system_inodes[type].si_name,
1614                                 slot);
1615
1616        return chars;
1617}
1618
1619static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
1620                                    umode_t mode)
1621{
1622        de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
1623}
1624
1625static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd)
1626{
1627        if ((offsetof(struct ocfs2_group_desc, bg_bitmap) +
1628             le16_to_cpu(gd->bg_size)) !=
1629            offsetof(struct ocfs2_group_desc, bg_list))
1630                return 0;
1631        /*
1632         * Only valid to check l_next_free_rec if
1633         * bg_bitmap + bg_size == bg_list.
1634         */
1635        if (!gd->bg_list.l_next_free_rec)
1636                return 0;
1637        return 1;
1638}
1639#endif  /* _OCFS2_FS_H */
1640
1641
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