release/src-rt-6.x/linux/linux-2.6/fs/ocfs2/ocfs2_fs.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * ocfs2_fs.h
   5  *
   6  * On-disk structures for OCFS2.
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License, version 2,  as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public
  20  * License along with this program; if not, write to the
  21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22  * Boston, MA 021110-1307, USA.
  23  */
  24
  25 #ifndef _OCFS2_FS_H
  26 #define _OCFS2_FS_H
  27
  28 /* Version */
  29 #define OCFS2_MAJOR_REV_LEVEL           0
  30 #define OCFS2_MINOR_REV_LEVEL           90
  31
  32 /*
  33  * An OCFS2 volume starts this way:
  34  * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
  35  * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
  36  * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
  37  *
  38  * All other structures are found from the superblock information.
  39  *
  40  * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors.  eg, for a
  41  * blocksize of 2K, it is 4096 bytes into disk.
  42  */
  43 #define OCFS2_SUPER_BLOCK_BLKNO         2
  44
  45 /*
  46  * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
  47  * grow if needed.
  48  */
  49 #define OCFS2_MIN_CLUSTERSIZE           4096
  50 #define OCFS2_MAX_CLUSTERSIZE           1048576
  51
  52 /*
  53  * Blocks cannot be bigger than clusters, so the maximum blocksize is the
  54  * minimum cluster size.
  55  */
  56 #define OCFS2_MIN_BLOCKSIZE             512
  57 #define OCFS2_MAX_BLOCKSIZE             OCFS2_MIN_CLUSTERSIZE
  58
  59 /* Filesystem magic number */
  60 #define OCFS2_SUPER_MAGIC               0x7461636f
  61
  62 /* Object signatures */
  63 #define OCFS2_SUPER_BLOCK_SIGNATURE     "OCFSV2"
  64 #define OCFS2_INODE_SIGNATURE           "INODE01"
  65 #define OCFS2_EXTENT_BLOCK_SIGNATURE    "EXBLK01"
  66 #define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"
  67
  68 /* Compatibility flags */
  69 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
  70         ( OCFS2_SB(sb)->s_feature_compat & (mask) )
  71 #define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)                    \
  72         ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
  73 #define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)                     \
  74         ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
  75 #define OCFS2_SET_COMPAT_FEATURE(sb,mask)                       \
  76         OCFS2_SB(sb)->s_feature_compat |= (mask)
  77 #define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)                    \
  78         OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
  79 #define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)                     \
  80         OCFS2_SB(sb)->s_feature_incompat |= (mask)
  81 #define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)                     \
  82         OCFS2_SB(sb)->s_feature_compat &= ~(mask)
  83 #define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                  \
  84         OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
  85 #define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)                   \
  86         OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
  87
  88 #define OCFS2_FEATURE_COMPAT_SUPP       OCFS2_FEATURE_COMPAT_BACKUP_SB
  89 #define OCFS2_FEATURE_INCOMPAT_SUPP     (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
  90                                          | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
  91 #define OCFS2_FEATURE_RO_COMPAT_SUPP    0
  92
  93 /*
  94  * Heartbeat-only devices are missing journals and other files.  The
  95  * filesystem driver can't load them, but the library can.  Never put
  96  * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
  97  */
  98 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV    0x0002
  99
 100 /*
 101  * tunefs sets this incompat flag before starting the resize and clears it
 102  * at the end. This flag protects users from inadvertently mounting the fs
 103  * after an aborted run without fsck-ing.
 104  */
 105 #define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG    0x0004
 106
 107 /* Used to denote a non-clustered volume */
 108 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT      0x0008
 109
 110 /* Support for sparse allocation in b-trees */
 111 #define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC     0x0010
 112
 113 /*
 114  * backup superblock flag is used to indicate that this volume
 115  * has backup superblocks.
 116  */
 117 #define OCFS2_FEATURE_COMPAT_BACKUP_SB          0x0001
 118
 119 /* The byte offset of the first backup block will be 1G.
 120  * The following will be 4G, 16G, 64G, 256G and 1T.
 121  */
 122 #define OCFS2_BACKUP_SB_START                   1 << 30
 123
 124 /* the max backup superblock nums */
 125 #define OCFS2_MAX_BACKUP_SUPERBLOCKS    6
 126
 127 /*
 128  * Flags on ocfs2_dinode.i_flags
 129  */
 130 #define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
 131 #define OCFS2_UNUSED2_FL        (0x00000002)
 132 #define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
 133 #define OCFS2_UNUSED3_FL        (0x00000008)
 134 /* System inode flags */
 135 #define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
 136 #define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
 137 #define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
 138 #define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
 139 #define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
 140 #define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
 141 #define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 142 #define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 143
 144 /* Inode attributes, keep in sync with EXT2 */
 145 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
 146 #define OCFS2_UNRM_FL           (0x00000002)    /* Undelete */
 147 #define OCFS2_COMPR_FL          (0x00000004)    /* Compress file */
 148 #define OCFS2_SYNC_FL           (0x00000008)    /* Synchronous updates */
 149 #define OCFS2_IMMUTABLE_FL      (0x00000010)    /* Immutable file */
 150 #define OCFS2_APPEND_FL         (0x00000020)    /* writes to file may only append */
 151 #define OCFS2_NODUMP_FL         (0x00000040)    /* do not dump file */
 152 #define OCFS2_NOATIME_FL        (0x00000080)    /* do not update atime */
 153 #define OCFS2_DIRSYNC_FL        (0x00010000)    /* dirsync behaviour (directories only) */
 154
 155 #define OCFS2_FL_VISIBLE        (0x000100FF)    /* User visible flags */
 156 #define OCFS2_FL_MODIFIABLE     (0x000100FF)    /* User modifiable flags */
 157
 158 /*
 159  * Extent record flags (e_node.leaf.flags)
 160  */
 161 #define OCFS2_EXT_UNWRITTEN     (0x01)  /* Extent is allocated but
 162                                          * unwritten */
 163
 164 /*
 165  * ioctl commands
 166  */
 167 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
 168 #define OCFS2_IOC_SETFLAGS      _IOW('f', 2, long)
 169 #define OCFS2_IOC32_GETFLAGS    _IOR('f', 1, int)
 170 #define OCFS2_IOC32_SETFLAGS    _IOW('f', 2, int)
 171
 172 /*
 173  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 174  */
 175 #define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 176
 177 /*
 178  * superblock s_state flags
 179  */
 180 #define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 181
 182 /* Limit of space in ocfs2_dir_entry */
 183 #define OCFS2_MAX_FILENAME_LEN          255
 184
 185 /* Maximum slots on an ocfs2 file system */
 186 #define OCFS2_MAX_SLOTS                 255
 187
 188 /* Slot map indicator for an empty slot */
 189 #define OCFS2_INVALID_SLOT              -1
 190
 191 #define OCFS2_VOL_UUID_LEN              16
 192 #define OCFS2_MAX_VOL_LABEL_LEN         64
 193
 194 /* Journal limits (in bytes) */
 195 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 196
 197 struct ocfs2_system_inode_info {
 198         char    *si_name;
 199         int     si_iflags;
 200         int     si_mode;
 201 };
 202
 203 /* System file index */
 204 enum {
 205         BAD_BLOCK_SYSTEM_INODE = 0,
 206         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 207         SLOT_MAP_SYSTEM_INODE,
 208 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 209         HEARTBEAT_SYSTEM_INODE,
 210         GLOBAL_BITMAP_SYSTEM_INODE,
 211 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
 212         ORPHAN_DIR_SYSTEM_INODE,
 213         EXTENT_ALLOC_SYSTEM_INODE,
 214         INODE_ALLOC_SYSTEM_INODE,
 215         JOURNAL_SYSTEM_INODE,
 216         LOCAL_ALLOC_SYSTEM_INODE,
 217         TRUNCATE_LOG_SYSTEM_INODE,
 218         NUM_SYSTEM_INODES
 219 };
 220
 221 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 222         /* Global system inodes (single copy) */
 223         /* The first two are only used from userspace mfks/tunefs */
 224         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 225         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 226
 227         /* These are used by the running filesystem */
 228         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 229         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 230         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 231
 232         /* Slot-specific system inodes (one copy per slot) */
 233         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 234         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 235         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 236         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 237         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 238         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
 239 };
 240
 241 /* Parameter passed from mount.ocfs2 to module */
 242 #define OCFS2_HB_NONE                   "heartbeat=none"
 243 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 244
 245 /*
 246  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 247  * other bits are reserved for now.
 248  */
 249 #define OCFS2_FT_UNKNOWN        0
 250 #define OCFS2_FT_REG_FILE       1
 251 #define OCFS2_FT_DIR            2
 252 #define OCFS2_FT_CHRDEV         3
 253 #define OCFS2_FT_BLKDEV         4
 254 #define OCFS2_FT_FIFO           5
 255 #define OCFS2_FT_SOCK           6
 256 #define OCFS2_FT_SYMLINK        7
 257
 258 #define OCFS2_FT_MAX            8
 259
 260 /*
 261  * OCFS2_DIR_PAD defines the directory entries boundaries
 262  *
 263  * NOTE: It must be a multiple of 4
 264  */
 265 #define OCFS2_DIR_PAD                   4
 266 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 267 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 268 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 269                                           OCFS2_DIR_ROUND) & \
 270                                          ~OCFS2_DIR_ROUND)
 271
 272 #define OCFS2_LINK_MAX          32000
 273
 274 #define S_SHIFT                 12
 275 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 276         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 277         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 278         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 279         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 280         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 281         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 282         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 283 };
 284
 285
 286 /*
 287  * Convenience casts
 288  */
 289 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 290
 291 /*
 292  * On disk extent record for OCFS2
 293  * It describes a range of clusters on disk.
 294  *
 295  * Length fields are divided into interior and leaf node versions.
 296  * This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
 297  */
 298 struct ocfs2_extent_rec {
 299 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 300         union {
 301                 __le32 e_int_clusters; /* Clusters covered by all children */
 302                 struct {
 303                         __le16 e_leaf_clusters; /* Clusters covered by this
 304                                                    extent */
 305                         __u8 e_reserved1;
 306                         __u8 e_flags; /* Extent flags */
 307                 };
 308         };
 309         __le64 e_blkno;         /* Physical disk offset, in blocks */
 310 /*10*/
 311 };
 312
 313 struct ocfs2_chain_rec {
 314         __le32 c_free;  /* Number of free bits in this chain. */
 315         __le32 c_total; /* Number of total bits in this chain */
 316         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 317 };
 318
 319 struct ocfs2_truncate_rec {
 320         __le32 t_start;         /* 1st cluster in this log */
 321         __le32 t_clusters;      /* Number of total clusters covered */
 322 };
 323
 324 /*
 325  * On disk extent list for OCFS2 (node in the tree).  Note that this
 326  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 327  * offsets are relative to ocfs2_dinode.id2.i_list or
 328  * ocfs2_extent_block.h_list, respectively.
 329  */
 330 struct ocfs2_extent_list {
 331 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 332                                            point.  0 means data extents
 333                                            hang directly off this
 334                                            header (a leaf)
 335                                            NOTE: The high 8 bits cannot be
 336                                            used - tree_depth is never that big.
 337                                         */
 338         __le16 l_count;                 /* Number of extent records */
 339         __le16 l_next_free_rec;         /* Next unused extent slot */
 340         __le16 l_reserved1;
 341         __le64 l_reserved2;             /* Pad to
 342                                            sizeof(ocfs2_extent_rec) */
 343 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 344 };
 345
 346 /*
 347  * On disk allocation chain list for OCFS2.  Note that this is
 348  * contained inside ocfs2_dinode, so the offsets are relative to
 349  * ocfs2_dinode.id2.i_chain.
 350  */
 351 struct ocfs2_chain_list {
 352 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 353         __le16 cl_bpc;                  /* Bits per cluster */
 354         __le16 cl_count;                /* Total chains in this list */
 355         __le16 cl_next_free_rec;        /* Next unused chain slot */
 356         __le64 cl_reserved1;
 357 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 358 };
 359
 360 /*
 361  * On disk deallocation log for OCFS2.  Note that this is
 362  * contained inside ocfs2_dinode, so the offsets are relative to
 363  * ocfs2_dinode.id2.i_dealloc.
 364  */
 365 struct ocfs2_truncate_log {
 366 /*00*/  __le16 tl_count;                /* Total records in this log */
 367         __le16 tl_used;                 /* Number of records in use */
 368         __le32 tl_reserved1;
 369 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 370 };
 371
 372 /*
 373  * On disk extent block (indirect block) for OCFS2
 374  */
 375 struct ocfs2_extent_block
 376 {
 377 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 378         __le64 h_reserved1;
 379 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 380                                            extent_header belongs to */
 381         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 382                                            block group */
 383         __le32 h_fs_generation;         /* Must match super block */
 384         __le64 h_blkno;                 /* Offset on disk, in blocks */
 385 /*20*/  __le64 h_reserved3;
 386         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 387                                            of next leaf header pointing
 388                                            to data */
 389 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 390 /* Actual on-disk size is one block */
 391 };
 392
 393 /*
 394  * On disk superblock for OCFS2
 395  * Note that it is contained inside an ocfs2_dinode, so all offsets
 396  * are relative to the start of ocfs2_dinode.id2.
 397  */
 398 struct ocfs2_super_block {
 399 /*00*/  __le16 s_major_rev_level;
 400         __le16 s_minor_rev_level;
 401         __le16 s_mnt_count;
 402         __le16 s_max_mnt_count;
 403         __le16 s_state;                 /* File system state */
 404         __le16 s_errors;                        /* Behaviour when detecting errors */
 405         __le32 s_checkinterval;         /* Max time between checks */
 406 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 407         __le32 s_creator_os;            /* OS */
 408         __le32 s_feature_compat;                /* Compatible feature set */
 409 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 410         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 411         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 412                                            dinode */
 413 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 414                                            directory dinode */
 415         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 416         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 417 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 418                                            before tunefs required */
 419         __le16 s_reserved1;
 420         __le32 s_reserved2;
 421         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 422                                          * group header */
 423 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 424 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 425 /*A0*/
 426 };
 427
 428 /*
 429  * Local allocation bitmap for OCFS2 slots
 430  * Note that it exists inside an ocfs2_dinode, so all offsets are
 431  * relative to the start of ocfs2_dinode.id2.
 432  */
 433 struct ocfs2_local_alloc
 434 {
 435 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 436         __le16 la_size;         /* Size of included bitmap, in bytes */
 437         __le16 la_reserved1;
 438         __le64 la_reserved2;
 439 /*10*/  __u8   la_bitmap[0];
 440 };
 441
 442 /*
 443  * On disk inode for OCFS2
 444  */
 445 struct ocfs2_dinode {
 446 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 447         __le32 i_generation;            /* Generation number */
 448         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 449                                            belongs to */
 450         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 451                                            block group */
 452 /*10*/  __le32 i_reserved0;
 453         __le32 i_clusters;              /* Cluster count */
 454         __le32 i_uid;                   /* Owner UID */
 455         __le32 i_gid;                   /* Owning GID */
 456 /*20*/  __le64 i_size;                  /* Size in bytes */
 457         __le16 i_mode;                  /* File mode */
 458         __le16 i_links_count;           /* Links count */
 459         __le32 i_flags;                 /* File flags */
 460 /*30*/  __le64 i_atime;                 /* Access time */
 461         __le64 i_ctime;                 /* Creation time */
 462 /*40*/  __le64 i_mtime;                 /* Modification time */
 463         __le64 i_dtime;                 /* Deletion time */
 464 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 465         __le64 i_last_eb_blk;           /* Pointer to last extent
 466                                            block */
 467 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 468         __le32 i_atime_nsec;
 469         __le32 i_ctime_nsec;
 470         __le32 i_mtime_nsec;
 471         __le32 i_attr;
 472         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
 473                                            was set in i_flags */
 474         __le16 i_reserved1;
 475 /*70*/  __le64 i_reserved2[8];
 476 /*B8*/  union {
 477                 __le64 i_pad1;          /* Generic way to refer to this
 478                                            64bit union */
 479                 struct {
 480                         __le64 i_rdev;  /* Device number */
 481                 } dev1;
 482                 struct {                /* Info for bitmap system
 483                                            inodes */
 484                         __le32 i_used;  /* Bits (ie, clusters) used  */
 485                         __le32 i_total; /* Total bits (clusters)
 486                                            available */
 487                 } bitmap1;
 488                 struct {                /* Info for journal system
 489                                            inodes */
 490                         __le32 ij_flags;        /* Mounted, version, etc. */
 491                         __le32 ij_pad;
 492                 } journal1;
 493         } id1;                          /* Inode type dependant 1 */
 494 /*C0*/  union {
 495                 struct ocfs2_super_block        i_super;
 496                 struct ocfs2_local_alloc        i_lab;
 497                 struct ocfs2_chain_list         i_chain;
 498                 struct ocfs2_extent_list        i_list;
 499                 struct ocfs2_truncate_log       i_dealloc;
 500                 __u8                            i_symlink[0];
 501         } id2;
 502 /* Actual on-disk size is one block */
 503 };
 504
 505 /*
 506  * On-disk directory entry structure for OCFS2
 507  *
 508  * Packed as this structure could be accessed unaligned on 64-bit platforms
 509  */
 510 struct ocfs2_dir_entry {
 511 /*00*/  __le64   inode;                  /* Inode number */
 512         __le16   rec_len;                /* Directory entry length */
 513         __u8    name_len;               /* Name length */
 514         __u8    file_type;
 515 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 516 /* Actual on-disk length specified by rec_len */
 517 } __attribute__ ((packed));
 518
 519 /*
 520  * On disk allocator group structure for OCFS2
 521  */
 522 struct ocfs2_group_desc
 523 {
 524 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 525         __le16   bg_size;                /* Size of included bitmap in
 526                                            bytes. */
 527         __le16   bg_bits;                /* Bits represented by this
 528                                            group. */
 529         __le16  bg_free_bits_count;     /* Free bits count */
 530         __le16   bg_chain;               /* What chain I am in. */
 531 /*10*/  __le32   bg_generation;
 532         __le32  bg_reserved1;
 533         __le64   bg_next_group;          /* Next group in my list, in
 534                                            blocks */
 535 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 536                                            blocks */
 537         __le64   bg_blkno;               /* Offset on disk, in blocks */
 538 /*30*/  __le64   bg_reserved2[2];
 539 /*40*/  __u8    bg_bitmap[0];
 540 };
 541
 542 #ifdef __KERNEL__
 543 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 544 {
 545         return  sb->s_blocksize -
 546                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 547 }
 548
 549 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 550 {
 551         int size;
 552
 553         size = sb->s_blocksize -
 554                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 555
 556         return size / sizeof(struct ocfs2_extent_rec);
 557 }
 558
 559 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 560 {
 561         int size;
 562
 563         size = sb->s_blocksize -
 564                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 565
 566         return size / sizeof(struct ocfs2_chain_rec);
 567 }
 568
 569 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 570 {
 571         int size;
 572
 573         size = sb->s_blocksize -
 574                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 575
 576         return size / sizeof(struct ocfs2_extent_rec);
 577 }
 578
 579 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 580 {
 581         u16 size;
 582
 583         size = sb->s_blocksize -
 584                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 585
 586         return size;
 587 }
 588
 589 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 590 {
 591         int size;
 592
 593         size = sb->s_blocksize -
 594                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 595
 596         return size;
 597 }
 598
 599 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 600 {
 601         int size;
 602
 603         size = sb->s_blocksize -
 604                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 605
 606         return size / sizeof(struct ocfs2_truncate_rec);
 607 }
 608
 609 static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
 610 {
 611         u64 offset = OCFS2_BACKUP_SB_START;
 612
 613         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
 614                 offset <<= (2 * index);
 615                 offset >>= sb->s_blocksize_bits;
 616                 return offset;
 617         }
 618
 619         return 0;
 620
 621 }
 622 #else
 623 static inline int ocfs2_fast_symlink_chars(int blocksize)
 624 {
 625         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 626 }
 627
 628 static inline int ocfs2_extent_recs_per_inode(int blocksize)
 629 {
 630         int size;
 631
 632         size = blocksize -
 633                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 634
 635         return size / sizeof(struct ocfs2_extent_rec);
 636 }
 637
 638 static inline int ocfs2_chain_recs_per_inode(int blocksize)
 639 {
 640         int size;
 641
 642         size = blocksize -
 643                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 644
 645         return size / sizeof(struct ocfs2_chain_rec);
 646 }
 647
 648 static inline int ocfs2_extent_recs_per_eb(int blocksize)
 649 {
 650         int size;
 651
 652         size = blocksize -
 653                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 654
 655         return size / sizeof(struct ocfs2_extent_rec);
 656 }
 657
 658 static inline int ocfs2_local_alloc_size(int blocksize)
 659 {
 660         int size;
 661
 662         size = blocksize -
 663                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 664
 665         return size;
 666 }
 667
 668 static inline int ocfs2_group_bitmap_size(int blocksize)
 669 {
 670         int size;
 671
 672         size = blocksize -
 673                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 674
 675         return size;
 676 }
 677
 678 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 679 {
 680         int size;
 681
 682         size = blocksize -
 683                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 684
 685         return size / sizeof(struct ocfs2_truncate_rec);
 686 }
 687
 688 static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
 689 {
 690         uint64_t offset = OCFS2_BACKUP_SB_START;
 691
 692         if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
 693                 offset <<= (2 * index);
 694                 offset /= blocksize;
 695                 return offset;
 696         }
 697
 698         return 0;
 699 }
 700 #endif  /* __KERNEL__ */
 701
 702
 703 static inline int ocfs2_system_inode_is_global(int type)
 704 {
 705         return ((type >= 0) &&
 706                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
 707 }
 708
 709 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
 710                                                   int type, int slot)
 711 {
 712         int chars;
 713
 714         /*
 715          * Global system inodes can only have one copy.  Everything
 716          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
 717          * list has a copy per slot.
 718          */
 719         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
 720                 chars = snprintf(buf, len,
 721                                  ocfs2_system_inodes[type].si_name);
 722         else
 723                 chars = snprintf(buf, len,
 724                                  ocfs2_system_inodes[type].si_name,
 725                                  slot);
 726
 727         return chars;
 728 }
 729
 730 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
 731                                     umode_t mode)
 732 {
 733         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 734 }
 735
 736 #endif  /* _OCFS2_FS_H */
 737