fs/ocfs2/ocfs2_fs.h

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