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       0
  89 #define OCFS2_FEATURE_INCOMPAT_SUPP     OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT
  90 #define OCFS2_FEATURE_RO_COMPAT_SUPP    0
  91
  92 /*
  93  * Heartbeat-only devices are missing journals and other files.  The
  94  * filesystem driver can't load them, but the library can.  Never put
  95  * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
  96  */
  97 #define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV    0x0002
  98
  99
 100 /* Used to denote a non-clustered volume */
 101 #define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT      0x0008
 102
 103 /*
 104  * Flags on ocfs2_dinode.i_flags
 105  */
 106 #define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
 107 #define OCFS2_UNUSED2_FL        (0x00000002)
 108 #define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
 109 #define OCFS2_UNUSED3_FL        (0x00000008)
 110 /* System inode flags */
 111 #define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
 112 #define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
 113 #define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
 114 #define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
 115 #define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
 116 #define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
 117 #define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
 118 #define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
 119
 120 /* Inode attributes, keep in sync with EXT2 */
 121 #define OCFS2_SECRM_FL          (0x00000001)    /* Secure deletion */
 122 #define OCFS2_UNRM_FL           (0x00000002)    /* Undelete */
 123 #define OCFS2_COMPR_FL          (0x00000004)    /* Compress file */
 124 #define OCFS2_SYNC_FL           (0x00000008)    /* Synchronous updates */
 125 #define OCFS2_IMMUTABLE_FL      (0x00000010)    /* Immutable file */
 126 #define OCFS2_APPEND_FL         (0x00000020)    /* writes to file may only append */
 127 #define OCFS2_NODUMP_FL         (0x00000040)    /* do not dump file */
 128 #define OCFS2_NOATIME_FL        (0x00000080)    /* do not update atime */
 129 #define OCFS2_DIRSYNC_FL        (0x00010000)    /* dirsync behaviour (directories only) */
 130
 131 #define OCFS2_FL_VISIBLE        (0x000100FF)    /* User visible flags */
 132 #define OCFS2_FL_MODIFIABLE     (0x000100FF)    /* User modifiable flags */
 133
 134 /*
 135  * ioctl commands
 136  */
 137 #define OCFS2_IOC_GETFLAGS      _IOR('f', 1, long)
 138 #define OCFS2_IOC_SETFLAGS      _IOW('f', 2, long)
 139
 140 /*
 141  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 142  */
 143 #define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 144
 145 /*
 146  * superblock s_state flags
 147  */
 148 #define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 149
 150 /* Limit of space in ocfs2_dir_entry */
 151 #define OCFS2_MAX_FILENAME_LEN          255
 152
 153 /* Maximum slots on an ocfs2 file system */
 154 #define OCFS2_MAX_SLOTS                 255
 155
 156 /* Slot map indicator for an empty slot */
 157 #define OCFS2_INVALID_SLOT              -1
 158
 159 #define OCFS2_VOL_UUID_LEN              16
 160 #define OCFS2_MAX_VOL_LABEL_LEN         64
 161
 162 /* Journal limits (in bytes) */
 163 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 164
 165 struct ocfs2_system_inode_info {
 166         char    *si_name;
 167         int     si_iflags;
 168         int     si_mode;
 169 };
 170
 171 /* System file index */
 172 enum {
 173         BAD_BLOCK_SYSTEM_INODE = 0,
 174         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 175         SLOT_MAP_SYSTEM_INODE,
 176 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 177         HEARTBEAT_SYSTEM_INODE,
 178         GLOBAL_BITMAP_SYSTEM_INODE,
 179 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
 180         ORPHAN_DIR_SYSTEM_INODE,
 181         EXTENT_ALLOC_SYSTEM_INODE,
 182         INODE_ALLOC_SYSTEM_INODE,
 183         JOURNAL_SYSTEM_INODE,
 184         LOCAL_ALLOC_SYSTEM_INODE,
 185         TRUNCATE_LOG_SYSTEM_INODE,
 186         NUM_SYSTEM_INODES
 187 };
 188
 189 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 190         /* Global system inodes (single copy) */
 191         /* The first two are only used from userspace mfks/tunefs */
 192         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 193         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 194
 195         /* These are used by the running filesystem */
 196         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 197         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 198         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 199
 200         /* Slot-specific system inodes (one copy per slot) */
 201         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 202         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 203         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 204         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 205         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 206         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
 207 };
 208
 209 /* Parameter passed from mount.ocfs2 to module */
 210 #define OCFS2_HB_NONE                   "heartbeat=none"
 211 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 212
 213 /*
 214  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 215  * other bits are reserved for now.
 216  */
 217 #define OCFS2_FT_UNKNOWN        0
 218 #define OCFS2_FT_REG_FILE       1
 219 #define OCFS2_FT_DIR            2
 220 #define OCFS2_FT_CHRDEV         3
 221 #define OCFS2_FT_BLKDEV         4
 222 #define OCFS2_FT_FIFO           5
 223 #define OCFS2_FT_SOCK           6
 224 #define OCFS2_FT_SYMLINK        7
 225
 226 #define OCFS2_FT_MAX            8
 227
 228 /*
 229  * OCFS2_DIR_PAD defines the directory entries boundaries
 230  *
 231  * NOTE: It must be a multiple of 4
 232  */
 233 #define OCFS2_DIR_PAD                   4
 234 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 235 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 236 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 237                                           OCFS2_DIR_ROUND) & \
 238                                          ~OCFS2_DIR_ROUND)
 239
 240 #define OCFS2_LINK_MAX          32000
 241
 242 #define S_SHIFT                 12
 243 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 244         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 245         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 246         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 247         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 248         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 249         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 250         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 251 };
 252
 253
 254 /*
 255  * Convenience casts
 256  */
 257 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 258
 259 /*
 260  * On disk extent record for OCFS2
 261  * It describes a range of clusters on disk.
 262  */
 263 struct ocfs2_extent_rec {
 264 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 265         __le32 e_clusters;      /* Clusters covered by this extent */
 266         __le64 e_blkno;         /* Physical disk offset, in blocks */
 267 /*10*/
 268 };
 269
 270 struct ocfs2_chain_rec {
 271         __le32 c_free;  /* Number of free bits in this chain. */
 272         __le32 c_total; /* Number of total bits in this chain */
 273         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 274 };
 275
 276 struct ocfs2_truncate_rec {
 277         __le32 t_start;         /* 1st cluster in this log */
 278         __le32 t_clusters;      /* Number of total clusters covered */
 279 };
 280
 281 /*
 282  * On disk extent list for OCFS2 (node in the tree).  Note that this
 283  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 284  * offsets are relative to ocfs2_dinode.id2.i_list or
 285  * ocfs2_extent_block.h_list, respectively.
 286  */
 287 struct ocfs2_extent_list {
 288 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 289                                            point.  0 means data extents
 290                                            hang directly off this
 291                                            header (a leaf) */
 292         __le16 l_count;                 /* Number of extent records */
 293         __le16 l_next_free_rec;         /* Next unused extent slot */
 294         __le16 l_reserved1;
 295         __le64 l_reserved2;             /* Pad to
 296                                            sizeof(ocfs2_extent_rec) */
 297 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 298 };
 299
 300 /*
 301  * On disk allocation chain list for OCFS2.  Note that this is
 302  * contained inside ocfs2_dinode, so the offsets are relative to
 303  * ocfs2_dinode.id2.i_chain.
 304  */
 305 struct ocfs2_chain_list {
 306 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 307         __le16 cl_bpc;                  /* Bits per cluster */
 308         __le16 cl_count;                /* Total chains in this list */
 309         __le16 cl_next_free_rec;        /* Next unused chain slot */
 310         __le64 cl_reserved1;
 311 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 312 };
 313
 314 /*
 315  * On disk deallocation log for OCFS2.  Note that this is
 316  * contained inside ocfs2_dinode, so the offsets are relative to
 317  * ocfs2_dinode.id2.i_dealloc.
 318  */
 319 struct ocfs2_truncate_log {
 320 /*00*/  __le16 tl_count;                /* Total records in this log */
 321         __le16 tl_used;                 /* Number of records in use */
 322         __le32 tl_reserved1;
 323 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 324 };
 325
 326 /*
 327  * On disk extent block (indirect block) for OCFS2
 328  */
 329 struct ocfs2_extent_block
 330 {
 331 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 332         __le64 h_reserved1;
 333 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 334                                            extent_header belongs to */
 335         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 336                                            block group */
 337         __le32 h_fs_generation;         /* Must match super block */
 338         __le64 h_blkno;                 /* Offset on disk, in blocks */
 339 /*20*/  __le64 h_reserved3;
 340         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 341                                            of next leaf header pointing
 342                                            to data */
 343 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 344 /* Actual on-disk size is one block */
 345 };
 346
 347 /*
 348  * On disk superblock for OCFS2
 349  * Note that it is contained inside an ocfs2_dinode, so all offsets
 350  * are relative to the start of ocfs2_dinode.id2.
 351  */
 352 struct ocfs2_super_block {
 353 /*00*/  __le16 s_major_rev_level;
 354         __le16 s_minor_rev_level;
 355         __le16 s_mnt_count;
 356         __le16 s_max_mnt_count;
 357         __le16 s_state;                 /* File system state */
 358         __le16 s_errors;                        /* Behaviour when detecting errors */
 359         __le32 s_checkinterval;         /* Max time between checks */
 360 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 361         __le32 s_creator_os;            /* OS */
 362         __le32 s_feature_compat;                /* Compatible feature set */
 363 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 364         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 365         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 366                                            dinode */
 367 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 368                                            directory dinode */
 369         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 370         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 371 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 372                                            before tunefs required */
 373         __le16 s_reserved1;
 374         __le32 s_reserved2;
 375         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 376                                          * group header */
 377 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 378 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 379 /*A0*/
 380 };
 381
 382 /*
 383  * Local allocation bitmap for OCFS2 slots
 384  * Note that it exists inside an ocfs2_dinode, so all offsets are
 385  * relative to the start of ocfs2_dinode.id2.
 386  */
 387 struct ocfs2_local_alloc
 388 {
 389 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 390         __le16 la_size;         /* Size of included bitmap, in bytes */
 391         __le16 la_reserved1;
 392         __le64 la_reserved2;
 393 /*10*/  __u8   la_bitmap[0];
 394 };
 395
 396 /*
 397  * On disk inode for OCFS2
 398  */
 399 struct ocfs2_dinode {
 400 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 401         __le32 i_generation;            /* Generation number */
 402         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 403                                            belongs to */
 404         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 405                                            block group */
 406 /*10*/  __le32 i_reserved0;
 407         __le32 i_clusters;              /* Cluster count */
 408         __le32 i_uid;                   /* Owner UID */
 409         __le32 i_gid;                   /* Owning GID */
 410 /*20*/  __le64 i_size;                  /* Size in bytes */
 411         __le16 i_mode;                  /* File mode */
 412         __le16 i_links_count;           /* Links count */
 413         __le32 i_flags;                 /* File flags */
 414 /*30*/  __le64 i_atime;                 /* Access time */
 415         __le64 i_ctime;                 /* Creation time */
 416 /*40*/  __le64 i_mtime;                 /* Modification time */
 417         __le64 i_dtime;                 /* Deletion time */
 418 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 419         __le64 i_last_eb_blk;           /* Pointer to last extent
 420                                            block */
 421 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 422         __le32 i_atime_nsec;
 423         __le32 i_ctime_nsec;
 424         __le32 i_mtime_nsec;
 425         __le32 i_attr;
 426         __le32 i_reserved1;
 427 /*70*/  __le64 i_reserved2[8];
 428 /*B8*/  union {
 429                 __le64 i_pad1;          /* Generic way to refer to this
 430                                            64bit union */
 431                 struct {
 432                         __le64 i_rdev;  /* Device number */
 433                 } dev1;
 434                 struct {                /* Info for bitmap system
 435                                            inodes */
 436                         __le32 i_used;  /* Bits (ie, clusters) used  */
 437                         __le32 i_total; /* Total bits (clusters)
 438                                            available */
 439                 } bitmap1;
 440                 struct {                /* Info for journal system
 441                                            inodes */
 442                         __le32 ij_flags;        /* Mounted, version, etc. */
 443                         __le32 ij_pad;
 444                 } journal1;
 445         } id1;                          /* Inode type dependant 1 */
 446 /*C0*/  union {
 447                 struct ocfs2_super_block        i_super;
 448                 struct ocfs2_local_alloc        i_lab;
 449                 struct ocfs2_chain_list         i_chain;
 450                 struct ocfs2_extent_list        i_list;
 451                 struct ocfs2_truncate_log       i_dealloc;
 452                 __u8                            i_symlink[0];
 453         } id2;
 454 /* Actual on-disk size is one block */
 455 };
 456
 457 /*
 458  * On-disk directory entry structure for OCFS2
 459  *
 460  * Packed as this structure could be accessed unaligned on 64-bit platforms
 461  */
 462 struct ocfs2_dir_entry {
 463 /*00*/  __le64   inode;                  /* Inode number */
 464         __le16   rec_len;                /* Directory entry length */
 465         __u8    name_len;               /* Name length */
 466         __u8    file_type;
 467 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 468 /* Actual on-disk length specified by rec_len */
 469 } __attribute__ ((packed));
 470
 471 /*
 472  * On disk allocator group structure for OCFS2
 473  */
 474 struct ocfs2_group_desc
 475 {
 476 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 477         __le16   bg_size;                /* Size of included bitmap in
 478                                            bytes. */
 479         __le16   bg_bits;                /* Bits represented by this
 480                                            group. */
 481         __le16  bg_free_bits_count;     /* Free bits count */
 482         __le16   bg_chain;               /* What chain I am in. */
 483 /*10*/  __le32   bg_generation;
 484         __le32  bg_reserved1;
 485         __le64   bg_next_group;          /* Next group in my list, in
 486                                            blocks */
 487 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 488                                            blocks */
 489         __le64   bg_blkno;               /* Offset on disk, in blocks */
 490 /*30*/  __le64   bg_reserved2[2];
 491 /*40*/  __u8    bg_bitmap[0];
 492 };
 493
 494 #ifdef __KERNEL__
 495 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 496 {
 497         return  sb->s_blocksize -
 498                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 499 }
 500
 501 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 502 {
 503         int size;
 504
 505         size = sb->s_blocksize -
 506                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 507
 508         return size / sizeof(struct ocfs2_extent_rec);
 509 }
 510
 511 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 512 {
 513         int size;
 514
 515         size = sb->s_blocksize -
 516                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 517
 518         return size / sizeof(struct ocfs2_chain_rec);
 519 }
 520
 521 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 522 {
 523         int size;
 524
 525         size = sb->s_blocksize -
 526                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 527
 528         return size / sizeof(struct ocfs2_extent_rec);
 529 }
 530
 531 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 532 {
 533         u16 size;
 534
 535         size = sb->s_blocksize -
 536                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 537
 538         return size;
 539 }
 540
 541 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 542 {
 543         int size;
 544
 545         size = sb->s_blocksize -
 546                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 547
 548         return size;
 549 }
 550
 551 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 552 {
 553         int size;
 554
 555         size = sb->s_blocksize -
 556                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 557
 558         return size / sizeof(struct ocfs2_truncate_rec);
 559 }
 560 #else
 561 static inline int ocfs2_fast_symlink_chars(int blocksize)
 562 {
 563         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 564 }
 565
 566 static inline int ocfs2_extent_recs_per_inode(int blocksize)
 567 {
 568         int size;
 569
 570         size = blocksize -
 571                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 572
 573         return size / sizeof(struct ocfs2_extent_rec);
 574 }
 575
 576 static inline int ocfs2_chain_recs_per_inode(int blocksize)
 577 {
 578         int size;
 579
 580         size = blocksize -
 581                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 582
 583         return size / sizeof(struct ocfs2_chain_rec);
 584 }
 585
 586 static inline int ocfs2_extent_recs_per_eb(int blocksize)
 587 {
 588         int size;
 589
 590         size = blocksize -
 591                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 592
 593         return size / sizeof(struct ocfs2_extent_rec);
 594 }
 595
 596 static inline int ocfs2_local_alloc_size(int blocksize)
 597 {
 598         int size;
 599
 600         size = blocksize -
 601                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 602
 603         return size;
 604 }
 605
 606 static inline int ocfs2_group_bitmap_size(int blocksize)
 607 {
 608         int size;
 609
 610         size = blocksize -
 611                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 612
 613         return size;
 614 }
 615
 616 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 617 {
 618         int size;
 619
 620         size = blocksize -
 621                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 622
 623         return size / sizeof(struct ocfs2_truncate_rec);
 624 }
 625 #endif  /* __KERNEL__ */
 626
 627
 628 static inline int ocfs2_system_inode_is_global(int type)
 629 {
 630         return ((type >= 0) &&
 631                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
 632 }
 633
 634 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
 635                                                   int type, int slot)
 636 {
 637         int chars;
 638
 639         /*
 640          * Global system inodes can only have one copy.  Everything
 641          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
 642          * list has a copy per slot.
 643          */
 644         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
 645                 chars = snprintf(buf, len,
 646                                  ocfs2_system_inodes[type].si_name);
 647         else
 648                 chars = snprintf(buf, len,
 649                                  ocfs2_system_inodes[type].si_name,
 650                                  slot);
 651
 652         return chars;
 653 }
 654
 655 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
 656                                     umode_t mode)
 657 {
 658         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 659 }
 660
 661 #endif  /* _OCFS2_FS_H */
 662