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 #define OCFS2_MAX_JOURNAL_SIZE          (500 * 1024 * 1024)
 142
 143 struct ocfs2_system_inode_info {
 144         char    *si_name;
 145         int     si_iflags;
 146         int     si_mode;
 147 };
 148
 149 /* System file index */
 150 enum {
 151         BAD_BLOCK_SYSTEM_INODE = 0,
 152         GLOBAL_INODE_ALLOC_SYSTEM_INODE,
 153         SLOT_MAP_SYSTEM_INODE,
 154 #define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
 155         HEARTBEAT_SYSTEM_INODE,
 156         GLOBAL_BITMAP_SYSTEM_INODE,
 157 #define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
 158         ORPHAN_DIR_SYSTEM_INODE,
 159         EXTENT_ALLOC_SYSTEM_INODE,
 160         INODE_ALLOC_SYSTEM_INODE,
 161         JOURNAL_SYSTEM_INODE,
 162         LOCAL_ALLOC_SYSTEM_INODE,
 163         TRUNCATE_LOG_SYSTEM_INODE,
 164         NUM_SYSTEM_INODES
 165 };
 166
 167 static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
 168         /* Global system inodes (single copy) */
 169         /* The first two are only used from userspace mfks/tunefs */
 170         [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
 171         [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 172
 173         /* These are used by the running filesystem */
 174         [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
 175         [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
 176         [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
 177
 178         /* Slot-specific system inodes (one copy per slot) */
 179         [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
 180         [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 181         [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
 182         [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
 183         [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
 184         [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
 185 };
 186
 187 /* Parameter passed from mount.ocfs2 to module */
 188 #define OCFS2_HB_NONE                   "heartbeat=none"
 189 #define OCFS2_HB_LOCAL                  "heartbeat=local"
 190
 191 /*
 192  * OCFS2 directory file types.  Only the low 3 bits are used.  The
 193  * other bits are reserved for now.
 194  */
 195 #define OCFS2_FT_UNKNOWN        0
 196 #define OCFS2_FT_REG_FILE       1
 197 #define OCFS2_FT_DIR            2
 198 #define OCFS2_FT_CHRDEV         3
 199 #define OCFS2_FT_BLKDEV         4
 200 #define OCFS2_FT_FIFO           5
 201 #define OCFS2_FT_SOCK           6
 202 #define OCFS2_FT_SYMLINK        7
 203
 204 #define OCFS2_FT_MAX            8
 205
 206 /*
 207  * OCFS2_DIR_PAD defines the directory entries boundaries
 208  *
 209  * NOTE: It must be a multiple of 4
 210  */
 211 #define OCFS2_DIR_PAD                   4
 212 #define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
 213 #define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
 214 #define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
 215                                           OCFS2_DIR_ROUND) & \
 216                                          ~OCFS2_DIR_ROUND)
 217
 218 #define OCFS2_LINK_MAX          32000
 219
 220 #define S_SHIFT                 12
 221 static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
 222         [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
 223         [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
 224         [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
 225         [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
 226         [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
 227         [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
 228         [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
 229 };
 230
 231
 232 /*
 233  * Convenience casts
 234  */
 235 #define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
 236
 237 /*
 238  * On disk extent record for OCFS2
 239  * It describes a range of clusters on disk.
 240  */
 241 struct ocfs2_extent_rec {
 242 /*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
 243         __le32 e_clusters;      /* Clusters covered by this extent */
 244         __le64 e_blkno;         /* Physical disk offset, in blocks */
 245 /*10*/
 246 };
 247
 248 struct ocfs2_chain_rec {
 249         __le32 c_free;  /* Number of free bits in this chain. */
 250         __le32 c_total; /* Number of total bits in this chain */
 251         __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
 252 };
 253
 254 struct ocfs2_truncate_rec {
 255         __le32 t_start;         /* 1st cluster in this log */
 256         __le32 t_clusters;      /* Number of total clusters covered */
 257 };
 258
 259 /*
 260  * On disk extent list for OCFS2 (node in the tree).  Note that this
 261  * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
 262  * offsets are relative to ocfs2_dinode.id2.i_list or
 263  * ocfs2_extent_block.h_list, respectively.
 264  */
 265 struct ocfs2_extent_list {
 266 /*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
 267                                            point.  0 means data extents
 268                                            hang directly off this
 269                                            header (a leaf) */
 270         __le16 l_count;                 /* Number of extent records */
 271         __le16 l_next_free_rec;         /* Next unused extent slot */
 272         __le16 l_reserved1;
 273         __le64 l_reserved2;             /* Pad to
 274                                            sizeof(ocfs2_extent_rec) */
 275 /*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
 276 };
 277
 278 /*
 279  * On disk allocation chain list for OCFS2.  Note that this is
 280  * contained inside ocfs2_dinode, so the offsets are relative to
 281  * ocfs2_dinode.id2.i_chain.
 282  */
 283 struct ocfs2_chain_list {
 284 /*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
 285         __le16 cl_bpc;                  /* Bits per cluster */
 286         __le16 cl_count;                /* Total chains in this list */
 287         __le16 cl_next_free_rec;        /* Next unused chain slot */
 288         __le64 cl_reserved1;
 289 /*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
 290 };
 291
 292 /*
 293  * On disk deallocation log for OCFS2.  Note that this is
 294  * contained inside ocfs2_dinode, so the offsets are relative to
 295  * ocfs2_dinode.id2.i_dealloc.
 296  */
 297 struct ocfs2_truncate_log {
 298 /*00*/  __le16 tl_count;                /* Total records in this log */
 299         __le16 tl_used;                 /* Number of records in use */
 300         __le32 tl_reserved1;
 301 /*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
 302 };
 303
 304 /*
 305  * On disk extent block (indirect block) for OCFS2
 306  */
 307 struct ocfs2_extent_block
 308 {
 309 /*00*/  __u8 h_signature[8];            /* Signature for verification */
 310         __le64 h_reserved1;
 311 /*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
 312                                            extent_header belongs to */
 313         __le16 h_suballoc_bit;          /* Bit offset in suballocator
 314                                            block group */
 315         __le32 h_fs_generation;         /* Must match super block */
 316         __le64 h_blkno;                 /* Offset on disk, in blocks */
 317 /*20*/  __le64 h_reserved3;
 318         __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
 319                                            of next leaf header pointing
 320                                            to data */
 321 /*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
 322 /* Actual on-disk size is one block */
 323 };
 324
 325 /*
 326  * On disk superblock for OCFS2
 327  * Note that it is contained inside an ocfs2_dinode, so all offsets
 328  * are relative to the start of ocfs2_dinode.id2.
 329  */
 330 struct ocfs2_super_block {
 331 /*00*/  __le16 s_major_rev_level;
 332         __le16 s_minor_rev_level;
 333         __le16 s_mnt_count;
 334         __le16 s_max_mnt_count;
 335         __le16 s_state;                 /* File system state */
 336         __le16 s_errors;                        /* Behaviour when detecting errors */
 337         __le32 s_checkinterval;         /* Max time between checks */
 338 /*10*/  __le64 s_lastcheck;             /* Time of last check */
 339         __le32 s_creator_os;            /* OS */
 340         __le32 s_feature_compat;                /* Compatible feature set */
 341 /*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
 342         __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
 343         __le64 s_root_blkno;            /* Offset, in blocks, of root directory
 344                                            dinode */
 345 /*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
 346                                            directory dinode */
 347         __le32 s_blocksize_bits;                /* Blocksize for this fs */
 348         __le32 s_clustersize_bits;      /* Clustersize for this fs */
 349 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
 350                                            before tunefs required */
 351         __le16 s_reserved1;
 352         __le32 s_reserved2;
 353         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
 354                                          * group header */
 355 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
 356 /*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
 357 /*A0*/
 358 };
 359
 360 /*
 361  * Local allocation bitmap for OCFS2 slots
 362  * Note that it exists inside an ocfs2_dinode, so all offsets are
 363  * relative to the start of ocfs2_dinode.id2.
 364  */
 365 struct ocfs2_local_alloc
 366 {
 367 /*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
 368         __le16 la_size;         /* Size of included bitmap, in bytes */
 369         __le16 la_reserved1;
 370         __le64 la_reserved2;
 371 /*10*/  __u8   la_bitmap[0];
 372 };
 373
 374 /*
 375  * On disk inode for OCFS2
 376  */
 377 struct ocfs2_dinode {
 378 /*00*/  __u8 i_signature[8];            /* Signature for validation */
 379         __le32 i_generation;            /* Generation number */
 380         __le16 i_suballoc_slot;         /* Slot suballocator this inode
 381                                            belongs to */
 382         __le16 i_suballoc_bit;          /* Bit offset in suballocator
 383                                            block group */
 384 /*10*/  __le32 i_reserved0;
 385         __le32 i_clusters;              /* Cluster count */
 386         __le32 i_uid;                   /* Owner UID */
 387         __le32 i_gid;                   /* Owning GID */
 388 /*20*/  __le64 i_size;                  /* Size in bytes */
 389         __le16 i_mode;                  /* File mode */
 390         __le16 i_links_count;           /* Links count */
 391         __le32 i_flags;                 /* File flags */
 392 /*30*/  __le64 i_atime;                 /* Access time */
 393         __le64 i_ctime;                 /* Creation time */
 394 /*40*/  __le64 i_mtime;                 /* Modification time */
 395         __le64 i_dtime;                 /* Deletion time */
 396 /*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
 397         __le64 i_last_eb_blk;           /* Pointer to last extent
 398                                            block */
 399 /*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
 400         __le32 i_atime_nsec;
 401         __le32 i_ctime_nsec;
 402         __le32 i_mtime_nsec;
 403 /*70*/  __le64 i_reserved1[9];
 404 /*B8*/  union {
 405                 __le64 i_pad1;          /* Generic way to refer to this
 406                                            64bit union */
 407                 struct {
 408                         __le64 i_rdev;  /* Device number */
 409                 } dev1;
 410                 struct {                /* Info for bitmap system
 411                                            inodes */
 412                         __le32 i_used;  /* Bits (ie, clusters) used  */
 413                         __le32 i_total; /* Total bits (clusters)
 414                                            available */
 415                 } bitmap1;
 416                 struct {                /* Info for journal system
 417                                            inodes */
 418                         __le32 ij_flags;        /* Mounted, version, etc. */
 419                         __le32 ij_pad;
 420                 } journal1;
 421         } id1;                          /* Inode type dependant 1 */
 422 /*C0*/  union {
 423                 struct ocfs2_super_block        i_super;
 424                 struct ocfs2_local_alloc        i_lab;
 425                 struct ocfs2_chain_list         i_chain;
 426                 struct ocfs2_extent_list        i_list;
 427                 struct ocfs2_truncate_log       i_dealloc;
 428                 __u8                            i_symlink[0];
 429         } id2;
 430 /* Actual on-disk size is one block */
 431 };
 432
 433 /*
 434  * On-disk directory entry structure for OCFS2
 435  *
 436  * Packed as this structure could be accessed unaligned on 64-bit platforms
 437  */
 438 struct ocfs2_dir_entry {
 439 /*00*/  __le64   inode;                  /* Inode number */
 440         __le16   rec_len;                /* Directory entry length */
 441         __u8    name_len;               /* Name length */
 442         __u8    file_type;
 443 /*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
 444 /* Actual on-disk length specified by rec_len */
 445 } __attribute__ ((packed));
 446
 447 /*
 448  * On disk allocator group structure for OCFS2
 449  */
 450 struct ocfs2_group_desc
 451 {
 452 /*00*/  __u8    bg_signature[8];        /* Signature for validation */
 453         __le16   bg_size;                /* Size of included bitmap in
 454                                            bytes. */
 455         __le16   bg_bits;                /* Bits represented by this
 456                                            group. */
 457         __le16  bg_free_bits_count;     /* Free bits count */
 458         __le16   bg_chain;               /* What chain I am in. */
 459 /*10*/  __le32   bg_generation;
 460         __le32  bg_reserved1;
 461         __le64   bg_next_group;          /* Next group in my list, in
 462                                            blocks */
 463 /*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
 464                                            blocks */
 465         __le64   bg_blkno;               /* Offset on disk, in blocks */
 466 /*30*/  __le64   bg_reserved2[2];
 467 /*40*/  __u8    bg_bitmap[0];
 468 };
 469
 470 #ifdef __KERNEL__
 471 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 472 {
 473         return  sb->s_blocksize -
 474                  offsetof(struct ocfs2_dinode, id2.i_symlink);
 475 }
 476
 477 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 478 {
 479         int size;
 480
 481         size = sb->s_blocksize -
 482                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 483
 484         return size / sizeof(struct ocfs2_extent_rec);
 485 }
 486
 487 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 488 {
 489         int size;
 490
 491         size = sb->s_blocksize -
 492                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 493
 494         return size / sizeof(struct ocfs2_chain_rec);
 495 }
 496
 497 static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
 498 {
 499         int size;
 500
 501         size = sb->s_blocksize -
 502                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 503
 504         return size / sizeof(struct ocfs2_extent_rec);
 505 }
 506
 507 static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
 508 {
 509         u16 size;
 510
 511         size = sb->s_blocksize -
 512                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 513
 514         return size;
 515 }
 516
 517 static inline int ocfs2_group_bitmap_size(struct super_block *sb)
 518 {
 519         int size;
 520
 521         size = sb->s_blocksize -
 522                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 523
 524         return size;
 525 }
 526
 527 static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
 528 {
 529         int size;
 530
 531         size = sb->s_blocksize -
 532                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 533
 534         return size / sizeof(struct ocfs2_truncate_rec);
 535 }
 536 #else
 537 static inline int ocfs2_fast_symlink_chars(int blocksize)
 538 {
 539         return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
 540 }
 541
 542 static inline int ocfs2_extent_recs_per_inode(int blocksize)
 543 {
 544         int size;
 545
 546         size = blocksize -
 547                 offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
 548
 549         return size / sizeof(struct ocfs2_extent_rec);
 550 }
 551
 552 static inline int ocfs2_chain_recs_per_inode(int blocksize)
 553 {
 554         int size;
 555
 556         size = blocksize -
 557                 offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
 558
 559         return size / sizeof(struct ocfs2_chain_rec);
 560 }
 561
 562 static inline int ocfs2_extent_recs_per_eb(int blocksize)
 563 {
 564         int size;
 565
 566         size = blocksize -
 567                 offsetof(struct ocfs2_extent_block, h_list.l_recs);
 568
 569         return size / sizeof(struct ocfs2_extent_rec);
 570 }
 571
 572 static inline int ocfs2_local_alloc_size(int blocksize)
 573 {
 574         int size;
 575
 576         size = blocksize -
 577                 offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
 578
 579         return size;
 580 }
 581
 582 static inline int ocfs2_group_bitmap_size(int blocksize)
 583 {
 584         int size;
 585
 586         size = blocksize -
 587                 offsetof(struct ocfs2_group_desc, bg_bitmap);
 588
 589         return size;
 590 }
 591
 592 static inline int ocfs2_truncate_recs_per_inode(int blocksize)
 593 {
 594         int size;
 595
 596         size = blocksize -
 597                 offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
 598
 599         return size / sizeof(struct ocfs2_truncate_rec);
 600 }
 601 #endif  /* __KERNEL__ */
 602
 603
 604 static inline int ocfs2_system_inode_is_global(int type)
 605 {
 606         return ((type >= 0) &&
 607                 (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
 608 }
 609
 610 static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
 611                                                   int type, int slot)
 612 {
 613         int chars;
 614
 615         /*
 616          * Global system inodes can only have one copy.  Everything
 617          * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
 618          * list has a copy per slot.
 619          */
 620         if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
 621                 chars = snprintf(buf, len,
 622                                  ocfs2_system_inodes[type].si_name);
 623         else
 624                 chars = snprintf(buf, len,
 625                                  ocfs2_system_inodes[type].si_name,
 626                                  slot);
 627
 628         return chars;
 629 }
 630
 631 static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
 632                                     umode_t mode)
 633 {
 634         de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
 635 }
 636
 637 #endif  /* _OCFS2_FS_H */
 638