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