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 /*
 118  * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
 119  */
 120 #define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
 121
 122 /*
 123  * superblock s_state flags
 124  */
 125 #define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
 126
 127 /* Limit of space in ocfs2_dir_entry */
 128 #define OCFS2_MAX_FILENAME_LEN          255
 129
 130 /* Maximum slots on an ocfs2 file system */
 131 #define OCFS2_MAX_SLOTS                 255
 132
 133 /* Slot map indicator for an empty slot */
 134 #define OCFS2_INVALID_SLOT              -1
 135
 136 #define OCFS2_VOL_UUID_LEN              16
 137 #define OCFS2_MAX_VOL_LABEL_LEN         64
 138
 139 /* Journal limits (in bytes) */
 140 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 141
 142 struct ocfs2_system_inode_info {
 143         char    *si_name;
 144         int     si_iflags;
 145         int     si_mode;
 146 };
 147
 148 /* System file index */
 149 enum {
 150         BAD_BLOCK_SYSTEM_INODE = 0,
 151         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 152         SLOT_MAP_SYSTEM_INODE,
 153 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 154         HEARTBEAT_SYSTEM_INODE,
 155         GLOBAL_BITMAP_SYSTEM_INODE,
 156 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
 157         ORPHAN_DIR_SYSTEM_INODE,
 158         EXTENT_ALLOC_SYSTEM_INODE,
 159         INODE_ALLOC_SYSTEM_INODE,
 160         JOURNAL_SYSTEM_INODE,
 161         LOCAL_ALLOC_SYSTEM_INODE,
 162         TRUNCATE_LOG_SYSTEM_INODE,
 163         NUM_SYSTEM_INODES
 164 };
 165
 166 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 167         /* Global system inodes (single copy) */
 168         /* The first two are only used from userspace mfks/tunefs */
 169         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 170         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 171
 172         /* These are used by the running filesystem */
 173         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 174         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 175         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 176
 177         /* Slot-specific system inodes (one copy per slot) */
 178         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 179         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 180         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 181         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 182         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 183         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
 184 };
 185
 186 /* Parameter passed from mount.ocfs2 to module */
 187 #define OCFS2_HB_NONE                   "heartbeat=none"
 188 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 189
 190 /*
 191  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 192  * other bits are reserved for now.
 193  */
 194 #define OCFS2_FT_UNKNOWN        0
 195 #define OCFS2_FT_REG_FILE       1
 196 #define OCFS2_FT_DIR            2
 197 #define OCFS2_FT_CHRDEV         3
 198 #define OCFS2_FT_BLKDEV         4
 199 #define OCFS2_FT_FIFO           5
 200 #define OCFS2_FT_SOCK           6
 201 #define OCFS2_FT_SYMLINK        7
 202
 203 #define OCFS2_FT_MAX            8
 204
 205 /*
 206  * OCFS2_DIR_PAD defines the directory entries boundaries
 207  *
 208  * NOTE: It must be a multiple of 4
 209  */
 210 #define OCFS2_DIR_PAD                   4
 211 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 212 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 213 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 214                                           OCFS2_DIR_ROUND) & \
 215                                          ~OCFS2_DIR_ROUND)
 216
 217 #define OCFS2_LINK_MAX          32000
 218
 219 #define S_SHIFT                 12
 220 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 221         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 222         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 223         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 224         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 225         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 226         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 227         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 228 };
 229
 230
 231 /*
 232  * Convenience casts
 233  */
 234 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 235
 236 /*
 237  * On disk extent record for OCFS2
 238  * It describes a range of clusters on disk.
 239  */
 240 struct ocfs2_extent_rec {
 241 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 242         __le32 e_clusters;      /* Clusters covered by this extent */
 243         __le64 e_blkno;         /* Physical disk offset, in blocks */
 244 /*10*/
 245 };
 246
 247 struct ocfs2_chain_rec {
 248         __le32 c_free;  /* Number of free bits in this chain. */
 249         __le32 c_total; /* Number of total bits in this chain */
 250         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 251 };
 252
 253 struct ocfs2_truncate_rec {
 254         __le32 t_start;         /* 1st cluster in this log */
 255         __le32 t_clusters;      /* Number of total clusters covered */
 256 };
 257
 258 /*
 259  * On disk extent list for OCFS2 (node in the tree).  Note that this
 260  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 261  * offsets are relative to ocfs2_dinode.id2.i_list or
 262  * ocfs2_extent_block.h_list, respectively.
 263  */
 264 struct ocfs2_extent_list {
 265 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 266                                            point.  0 means data extents
 267                                            hang directly off this
 268                                            header (a leaf) */
 269         __le16 l_count;                 /* Number of extent records */
 270         __le16 l_next_free_rec;         /* Next unused extent slot */
 271         __le16 l_reserved1;
 272         __le64 l_reserved2;             /* Pad to
 273                                            sizeof(ocfs2_extent_rec) */
 274 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 275 };
 276
 277 /*
 278  * On disk allocation chain list for OCFS2.  Note that this is
 279  * contained inside ocfs2_dinode, so the offsets are relative to
 280  * ocfs2_dinode.id2.i_chain.
 281  */
 282 struct ocfs2_chain_list {
 283 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 284         __le16 cl_bpc;                  /* Bits per cluster */
 285         __le16 cl_count;                /* Total chains in this list */
 286         __le16 cl_next_free_rec;        /* Next unused chain slot */
 287         __le64 cl_reserved1;
 288 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 289 };
 290
 291 /*
 292  * On disk deallocation log for OCFS2.  Note that this is
 293  * contained inside ocfs2_dinode, so the offsets are relative to
 294  * ocfs2_dinode.id2.i_dealloc.
 295  */
 296 struct ocfs2_truncate_log {
 297 /*00*/  __le16 tl_count;                /* Total records in this log */
 298         __le16 tl_used;                 /* Number of records in use */
 299         __le32 tl_reserved1;
 300 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 301 };
 302
 303 /*
 304  * On disk extent block (indirect block) for OCFS2
 305  */
 306 struct ocfs2_extent_block
 307 {
 308 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 309         __le64 h_reserved1;
 310 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 311                                            extent_header belongs to */
 312         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 313                                            block group */
 314         __le32 h_fs_generation;         /* Must match super block */
 315         __le64 h_blkno;                 /* Offset on disk, in blocks */
 316 /*20*/  __le64 h_reserved3;
 317         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 318                                            of next leaf header pointing
 319                                            to data */
 320 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 321 /* Actual on-disk size is one block */
 322 };
 323
 324 /*
 325  * On disk superblock for OCFS2
 326  * Note that it is contained inside an ocfs2_dinode, so all offsets
 327  * are relative to the start of ocfs2_dinode.id2.
 328  */
 329 struct ocfs2_super_block {
 330 /*00*/  __le16 s_major_rev_level;
 331         __le16 s_minor_rev_level;
 332         __le16 s_mnt_count;
 333         __le16 s_max_mnt_count;
 334         __le16 s_state;                 /* File system state */
 335         __le16 s_errors;                        /* Behaviour when detecting errors */
 336         __le32 s_checkinterval;         /* Max time between checks */
 337 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 338         __le32 s_creator_os;            /* OS */
 339         __le32 s_feature_compat;                /* Compatible feature set */
 340 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 341         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 342         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 343                                            dinode */
 344 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 345                                            directory dinode */
 346         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 347         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 348 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 349                                            before tunefs required */
 350         __le16 s_reserved1;
 351         __le32 s_reserved2;
 352         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 353                                          * group header */
 354 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 355 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 356 /*A0*/
 357 };
 358
 359 /*
 360  * Local allocation bitmap for OCFS2 slots
 361  * Note that it exists inside an ocfs2_dinode, so all offsets are
 362  * relative to the start of ocfs2_dinode.id2.
 363  */
 364 struct ocfs2_local_alloc
 365 {
 366 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 367         __le16 la_size;         /* Size of included bitmap, in bytes */
 368         __le16 la_reserved1;
 369         __le64 la_reserved2;
 370 /*10*/  __u8   la_bitmap[0];
 371 };
 372
 373 /*
 374  * On disk inode for OCFS2
 375  */
 376 struct ocfs2_dinode {
 377 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 378         __le32 i_generation;            /* Generation number */
 379         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 380                                            belongs to */
 381         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 382                                            block group */
 383 /*10*/  __le32 i_reserved0;
 384         __le32 i_clusters;              /* Cluster count */
 385         __le32 i_uid;                   /* Owner UID */
 386         __le32 i_gid;                   /* Owning GID */
 387 /*20*/  __le64 i_size;                  /* Size in bytes */
 388         __le16 i_mode;                  /* File mode */
 389         __le16 i_links_count;           /* Links count */
 390         __le32 i_flags;                 /* File flags */
 391 /*30*/  __le64 i_atime;                 /* Access time */
 392         __le64 i_ctime;                 /* Creation time */
 393 /*40*/  __le64 i_mtime;                 /* Modification time */
 394         __le64 i_dtime;                 /* Deletion time */
 395 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 396         __le64 i_last_eb_blk;           /* Pointer to last extent
 397                                            block */
 398 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 399         __le32 i_atime_nsec;
 400         __le32 i_ctime_nsec;
 401         __le32 i_mtime_nsec;
 402 /*70*/  __le64 i_reserved1[9];
 403 /*B8*/  union {
 404                 __le64 i_pad1;          /* Generic way to refer to this
 405                                            64bit union */
 406                 struct {
 407                         __le64 i_rdev;  /* Device number */
 408                 } dev1;
 409                 struct {                /* Info for bitmap system
 410                                            inodes */
 411                         __le32 i_used;  /* Bits (ie, clusters) used  */
 412                         __le32 i_total; /* Total bits (clusters)
 413                                            available */
 414                 } bitmap1;
 415                 struct {                /* Info for journal system
 416                                            inodes */
 417                         __le32 ij_flags;        /* Mounted, version, etc. */
 418                         __le32 ij_pad;
 419                 } journal1;
 420         } id1;                          /* Inode type dependant 1 */
 421 /*C0*/  union {
 422                 struct ocfs2_super_block        i_super;
 423                 struct ocfs2_local_alloc        i_lab;
 424                 struct ocfs2_chain_list         i_chain;
 425                 struct ocfs2_extent_list        i_list;
 426                 struct ocfs2_truncate_log       i_dealloc;
 427                 __u8                            i_symlink[0];
 428         } id2;
 429 /* Actual on-disk size is one block */
 430 };
 431
 432 /*
 433  * On-disk directory entry structure for OCFS2
 434  *
 435  * Packed as this structure could be accessed unaligned on 64-bit platforms
 436  */
 437 struct ocfs2_dir_entry {
 438 /*00*/  __le64   inode;                  /* Inode number */
 439         __le16   rec_len;                /* Directory entry length */
 440         __u8    name_len;               /* Name length */
 441         __u8    file_type;
 442 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 443 /* Actual on-disk length specified by rec_len */
 444 } __attribute__ ((packed));
 445
 446 /*
 447  * On disk allocator group structure for OCFS2
 448  */
 449 struct ocfs2_group_desc
 450 {
 451 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 452         __le16   bg_size;                /* Size of included bitmap in
 453                                            bytes. */
 454         __le16   bg_bits;                /* Bits represented by this
 455                                            group. */
 456         __le16  bg_free_bits_count;     /* Free bits count */
 457         __le16   bg_chain;               /* What chain I am in. */
 458 /*10*/  __le32   bg_generation;
 459         __le32  bg_reserved1;
 460         __le64   bg_next_group;          /* Next group in my list, in
 461                                            blocks */
 462 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 463                                            blocks */
 464         __le64   bg_blkno;               /* Offset on disk, in blocks */
 465 /*30*/  __le64   bg_reserved2[2];
 466 /*40*/  __u8    bg_bitmap[0];
 467 };
 468
 469 #ifdef __KERNEL__
 470 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 471 {
 472         return  sb->s_blocksize -
 473                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 474 }
 475
 476 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 477 {
 478         int size;
 479
 480         size = sb->s_blocksize -
 481                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 482
 483         return size / sizeof(struct ocfs2_extent_rec);
 484 }
 485
 486 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 487 {
 488         int size;
 489
 490         size = sb->s_blocksize -
 491                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 492
 493         return size / sizeof(struct ocfs2_chain_rec);
 494 }
 495
 496 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 497 {
 498         int size;
 499
 500         size = sb->s_blocksize -
 501                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 502
 503         return size / sizeof(struct ocfs2_extent_rec);
 504 }
 505
 506 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 507 {
 508         u16 size;
 509
 510         size = sb->s_blocksize -
 511                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 512
 513         return size;
 514 }
 515
 516 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 517 {
 518         int size;
 519
 520         size = sb->s_blocksize -
 521                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 522
 523         return size;
 524 }
 525
 526 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 527 {
 528         int size;
 529
 530         size = sb->s_blocksize -
 531                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 532
 533         return size / sizeof(struct ocfs2_truncate_rec);
 534 }
 535 #else
 536 static inline int ocfs2_fast_symlink_chars(int blocksize)
 537 {
 538         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 539 }
 540
 541 static inline int ocfs2_extent_recs_per_inode(int blocksize)
 542 {
 543         int size;
 544
 545         size = blocksize -
 546                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 547
 548         return size / sizeof(struct ocfs2_extent_rec);
 549 }
 550
 551 static inline int ocfs2_chain_recs_per_inode(int blocksize)
 552 {
 553         int size;
 554
 555         size = blocksize -
 556                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 557
 558         return size / sizeof(struct ocfs2_chain_rec);
 559 }
 560
 561 static inline int ocfs2_extent_recs_per_eb(int blocksize)
 562 {
 563         int size;
 564
 565         size = blocksize -
 566                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 567
 568         return size / sizeof(struct ocfs2_extent_rec);
 569 }
 570
 571 static inline int ocfs2_local_alloc_size(int blocksize)
 572 {
 573         int size;
 574
 575         size = blocksize -
 576                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 577
 578         return size;
 579 }
 580
 581 static inline int ocfs2_group_bitmap_size(int blocksize)
 582 {
 583         int size;
 584
 585         size = blocksize -
 586                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 587
 588         return size;
 589 }
 590
 591 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 592 {
 593         int size;
 594
 595         size = blocksize -
 596                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 597
 598         return size / sizeof(struct ocfs2_truncate_rec);
 599 }
 600 #endif  /* __KERNEL__ */
 601
 602
 603 static inline int ocfs2_system_inode_is_global(int type)
 604 {
 605         return ((type >= 0) &&
 606                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
 607 }
 608
 609 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
 610                                                   int type, int slot)
 611 {
 612         int chars;
 613
 614         /*
 615          * Global system inodes can only have one copy.  Everything
 616          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
 617          * list has a copy per slot.
 618          */
 619         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
 620                 chars = snprintf(buf, len,
 621                                  ocfs2_system_inodes[type].si_name);
 622         else
 623                 chars = snprintf(buf, len,
 624                                  ocfs2_system_inodes[type].si_name,
 625                                  slot);
 626
 627         return chars;
 628 }
 629
 630 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
 631                                     umode_t mode)
 632 {
 633         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 634 }
 635
 636 #endif  /* _OCFS2_FS_H */
 637