include/linux/gfs2_ondisk.h

   1 /*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License v.2.
   8 */
   9
  10 #ifndef __GFS2_ONDISK_DOT_H__
  11 #define __GFS2_ONDISK_DOT_H__
  12
  13 #define GFS2_MAGIC              0x01161970
  14 #define GFS2_BASIC_BLOCK        512
  15 #define GFS2_BASIC_BLOCK_SHIFT  9
  16
  17 /* Lock numbers of the LM_TYPE_NONDISK type */
  18
  19 #define GFS2_MOUNT_LOCK         0
  20 #define GFS2_LIVE_LOCK          1
  21 #define GFS2_TRANS_LOCK         2
  22 #define GFS2_RENAME_LOCK        3
  23
  24 /* Format numbers for various metadata types */
  25
  26 #define GFS2_FORMAT_NONE        0
  27 #define GFS2_FORMAT_SB          100
  28 #define GFS2_FORMAT_RG          200
  29 #define GFS2_FORMAT_RB          300
  30 #define GFS2_FORMAT_DI          400
  31 #define GFS2_FORMAT_IN          500
  32 #define GFS2_FORMAT_LF          600
  33 #define GFS2_FORMAT_JD          700
  34 #define GFS2_FORMAT_LH          800
  35 #define GFS2_FORMAT_LD          900
  36 #define GFS2_FORMAT_LB          1000
  37 #define GFS2_FORMAT_EA          1600
  38 #define GFS2_FORMAT_ED          1700
  39 #define GFS2_FORMAT_UT          1300
  40 #define GFS2_FORMAT_QC          1400
  41 /* These are format numbers for entities contained in files */
  42 #define GFS2_FORMAT_RI          1100
  43 #define GFS2_FORMAT_DE          1200
  44 #define GFS2_FORMAT_QU          1500
  45 /* These are part of the superblock */
  46 #define GFS2_FORMAT_FS          1801
  47 #define GFS2_FORMAT_MULTI       1900
  48
  49 /*
  50  * An on-disk inode number
  51  */
  52
  53 struct gfs2_inum {
  54         __be64 no_formal_ino;
  55         __be64 no_addr;
  56 };
  57
  58 static inline int gfs2_inum_equal(const struct gfs2_inum *ino1,
  59                                   const struct gfs2_inum *ino2)
  60 {
  61         return ino1->no_formal_ino == ino2->no_formal_ino &&
  62                ino1->no_addr == ino2->no_addr;
  63 }
  64
  65 /*
  66  * Generic metadata head structure
  67  * Every inplace buffer logged in the journal must start with this.
  68  */
  69
  70 #define GFS2_METATYPE_NONE      0
  71 #define GFS2_METATYPE_SB        1
  72 #define GFS2_METATYPE_RG        2
  73 #define GFS2_METATYPE_RB        3
  74 #define GFS2_METATYPE_DI        4
  75 #define GFS2_METATYPE_IN        5
  76 #define GFS2_METATYPE_LF        6
  77 #define GFS2_METATYPE_JD        7
  78 #define GFS2_METATYPE_LH        8
  79 #define GFS2_METATYPE_LD        9
  80 #define GFS2_METATYPE_LB        12
  81 #define GFS2_METATYPE_EA        10
  82 #define GFS2_METATYPE_ED        11
  83 #define GFS2_METATYPE_UT        13
  84 #define GFS2_METATYPE_QC        14
  85
  86 struct gfs2_meta_header {
  87         __be32 mh_magic;
  88         __be32 mh_type;
  89         __be64 __pad0;          /* Was generation number in gfs1 */
  90         __be32 mh_format;
  91         __be32 __pad1;          /* Was incarnation number in gfs1 */
  92 };
  93
  94 /*
  95  * super-block structure
  96  *
  97  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
  98  *
  99  * Order is important, need to be able to read old superblocks to do on-disk
 100  * version upgrades.
 101  */
 102
 103 /* Address of superblock in GFS2 basic blocks */
 104 #define GFS2_SB_ADDR            128
 105
 106 /* The lock number for the superblock (must be zero) */
 107 #define GFS2_SB_LOCK            0
 108
 109 /* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
 110    Includes: the fencing zero at the end */
 111 #define GFS2_LOCKNAME_LEN       64
 112
 113 struct gfs2_sb {
 114         struct gfs2_meta_header sb_header;
 115
 116         __be32 sb_fs_format;
 117         __be32 sb_multihost_format;
 118         __u32  __pad0;  /* Was superblock flags in gfs1 */
 119
 120         __be32 sb_bsize;
 121         __be32 sb_bsize_shift;
 122         __u32 __pad1;   /* Was journal segment size in gfs1 */
 123
 124         struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 125         struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 126         struct gfs2_inum sb_root_dir;
 127
 128         char sb_lockproto[GFS2_LOCKNAME_LEN];
 129         char sb_locktable[GFS2_LOCKNAME_LEN];
 130         /* In gfs1, quota and license dinodes followed */
 131 };
 132
 133 /*
 134  * resource index structure
 135  */
 136
 137 struct gfs2_rindex {
 138         __be64 ri_addr; /* grp block disk address */
 139         __be32 ri_length;       /* length of rgrp header in fs blocks */
 140         __u32 __pad;
 141
 142         __be64 ri_data0;        /* first data location */
 143         __be32 ri_data; /* num of data blocks in rgrp */
 144
 145         __be32 ri_bitbytes;     /* number of bytes in data bitmaps */
 146
 147         __u8 ri_reserved[64];
 148 };
 149
 150 /*
 151  * resource group header structure
 152  */
 153
 154 /* Number of blocks per byte in rgrp */
 155 #define GFS2_NBBY               4
 156 #define GFS2_BIT_SIZE           2
 157 #define GFS2_BIT_MASK           0x00000003
 158
 159 #define GFS2_BLKST_FREE         0
 160 #define GFS2_BLKST_USED         1
 161 #define GFS2_BLKST_INVALID      2
 162 #define GFS2_BLKST_DINODE       3
 163
 164 #define GFS2_RGF_JOURNAL        0x00000001
 165 #define GFS2_RGF_METAONLY       0x00000002
 166 #define GFS2_RGF_DATAONLY       0x00000004
 167 #define GFS2_RGF_NOALLOC        0x00000008
 168
 169 struct gfs2_rgrp {
 170         struct gfs2_meta_header rg_header;
 171
 172         __be32 rg_flags;
 173         __be32 rg_free;
 174         __be32 rg_dinodes;
 175
 176         __u8 rg_reserved[92]; /* Several fields from gfs1 now reserved */
 177 };
 178
 179 /*
 180  * quota structure
 181  */
 182
 183 struct gfs2_quota {
 184         __be64 qu_limit;
 185         __be64 qu_warn;
 186         __be64 qu_value;
 187         __u8 qu_reserved[64];
 188 };
 189
 190 /*
 191  * dinode structure
 192  */
 193
 194 #define GFS2_MAX_META_HEIGHT    10
 195 #define GFS2_DIR_MAX_DEPTH      17
 196
 197 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
 198 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
 199
 200 /* Dinode flags */
 201 #define GFS2_DIF_JDATA                  0x00000001
 202 #define GFS2_DIF_EXHASH                 0x00000002
 203 #define GFS2_DIF_UNUSED                 0x00000004  /* only in gfs1 */
 204 #define GFS2_DIF_EA_INDIRECT            0x00000008
 205 #define GFS2_DIF_DIRECTIO               0x00000010
 206 #define GFS2_DIF_IMMUTABLE              0x00000020
 207 #define GFS2_DIF_APPENDONLY             0x00000040
 208 #define GFS2_DIF_NOATIME                0x00000080
 209 #define GFS2_DIF_SYNC                   0x00000100
 210 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
 211 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
 212 #define GFS2_DIF_INHERIT_DIRECTIO       0x40000000
 213 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 214
 215 struct gfs2_dinode {
 216         struct gfs2_meta_header di_header;
 217
 218         struct gfs2_inum di_num;
 219
 220         __be32 di_mode; /* mode of file */
 221         __be32 di_uid;  /* owner's user id */
 222         __be32 di_gid;  /* owner's group id */
 223         __be32 di_nlink;        /* number of links to this file */
 224         __be64 di_size; /* number of bytes in file */
 225         __be64 di_blocks;       /* number of blocks in file */
 226         __be64 di_atime;        /* time last accessed */
 227         __be64 di_mtime;        /* time last modified */
 228         __be64 di_ctime;        /* time last changed */
 229         __be32 di_major;        /* device major number */
 230         __be32 di_minor;        /* device minor number */
 231
 232         /* This section varies from gfs1. Padding added to align with
 233          * remainder of dinode
 234          */
 235         __be64 di_goal_meta;    /* rgrp to alloc from next */
 236         __be64 di_goal_data;    /* data block goal */
 237         __u32 __pad[2];
 238
 239         __be32 di_flags;        /* GFS2_DIF_... */
 240         __be32 di_payload_format;  /* GFS2_FORMAT_... */
 241         __u16 __pad1;   /* Was ditype in gfs1 */
 242         __be16 di_height;       /* height of metadata */
 243         __u32 __pad2;   /* Unused incarnation number from gfs1 */
 244
 245         /* These only apply to directories  */
 246         __u16 __pad3;   /* Padding */
 247         __be16 di_depth;        /* Number of bits in the table */
 248         __be32 di_entries;      /* The number of entries in the directory */
 249
 250         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 251
 252         __be64 di_eattr;        /* extended attribute block number */
 253
 254         __u8 di_reserved[56];
 255 };
 256
 257 /*
 258  * directory structure - many of these per directory file
 259  */
 260
 261 #define GFS2_FNAMESIZE          255
 262 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
 263
 264 struct gfs2_dirent {
 265         struct gfs2_inum de_inum;
 266         __be32 de_hash;
 267         __be16 de_rec_len;
 268         __be16 de_name_len;
 269         __be16 de_type;
 270         __u8 __pad[14];
 271 };
 272
 273 /*
 274  * Header of leaf directory nodes
 275  */
 276
 277 struct gfs2_leaf {
 278         struct gfs2_meta_header lf_header;
 279
 280         __be16 lf_depth;                /* Depth of leaf */
 281         __be16 lf_entries;              /* Number of dirents in leaf */
 282         __be32 lf_dirent_format;        /* Format of the dirents */
 283         __be64 lf_next;                 /* Next leaf, if overflow */
 284
 285         __u8 lf_reserved[64];
 286 };
 287
 288 /*
 289  * Extended attribute header format
 290  */
 291
 292 #define GFS2_EA_MAX_NAME_LEN    255
 293 #define GFS2_EA_MAX_DATA_LEN    65536
 294
 295 #define GFS2_EATYPE_UNUSED      0
 296 #define GFS2_EATYPE_USR         1
 297 #define GFS2_EATYPE_SYS         2
 298
 299 #define GFS2_EATYPE_LAST        2
 300 #define GFS2_EATYPE_VALID(x)    ((x) <= GFS2_EATYPE_LAST)
 301
 302 #define GFS2_EAFLAG_LAST        0x01    /* last ea in block */
 303
 304 struct gfs2_ea_header {
 305         __be32 ea_rec_len;
 306         __be32 ea_data_len;
 307         __u8 ea_name_len;       /* no NULL pointer after the string */
 308         __u8 ea_type;           /* GFS2_EATYPE_... */
 309         __u8 ea_flags;          /* GFS2_EAFLAG_... */
 310         __u8 ea_num_ptrs;
 311         __u32 __pad;
 312 };
 313
 314 /*
 315  * Log header structure
 316  */
 317
 318 #define GFS2_LOG_HEAD_UNMOUNT   0x00000001      /* log is clean */
 319
 320 struct gfs2_log_header {
 321         struct gfs2_meta_header lh_header;
 322
 323         __be64 lh_sequence;     /* Sequence number of this transaction */
 324         __be32 lh_flags;        /* GFS2_LOG_HEAD_... */
 325         __be32 lh_tail;         /* Block number of log tail */
 326         __be32 lh_blkno;
 327         __be32 lh_hash;
 328 };
 329
 330 /*
 331  * Log type descriptor
 332  */
 333
 334 #define GFS2_LOG_DESC_METADATA  300
 335 /* ld_data1 is the number of metadata blocks in the descriptor.
 336    ld_data2 is unused. */
 337
 338 #define GFS2_LOG_DESC_REVOKE    301
 339 /* ld_data1 is the number of revoke blocks in the descriptor.
 340    ld_data2 is unused. */
 341
 342 #define GFS2_LOG_DESC_JDATA     302
 343 /* ld_data1 is the number of data blocks in the descriptor.
 344    ld_data2 is unused. */
 345
 346 struct gfs2_log_descriptor {
 347         struct gfs2_meta_header ld_header;
 348
 349         __be32 ld_type;         /* GFS2_LOG_DESC_... */
 350         __be32 ld_length;       /* Number of buffers in this chunk */
 351         __be32 ld_data1;        /* descriptor-specific field */
 352         __be32 ld_data2;        /* descriptor-specific field */
 353
 354         __u8 ld_reserved[32];
 355 };
 356
 357 /*
 358  * Inum Range
 359  * Describe a range of formal inode numbers allocated to
 360  * one machine to assign to inodes.
 361  */
 362
 363 #define GFS2_INUM_QUANTUM       1048576
 364
 365 struct gfs2_inum_range {
 366         __be64 ir_start;
 367         __be64 ir_length;
 368 };
 369
 370 /*
 371  * Statfs change
 372  * Describes an change to the pool of free and allocated
 373  * blocks.
 374  */
 375
 376 struct gfs2_statfs_change {
 377         __be64 sc_total;
 378         __be64 sc_free;
 379         __be64 sc_dinodes;
 380 };
 381
 382 /*
 383  * Unlinked Tag
 384  * Describes an allocated inode that isn't linked into
 385  * the directory tree and might need to be deallocated.
 386  */
 387
 388 #define GFS2_UTF_UNINIT         0x00000001
 389
 390 struct gfs2_unlinked_tag {
 391         struct gfs2_inum ut_inum;
 392         __be32 ut_flags;        /* GFS2_UTF_... */
 393         __u32 __pad;
 394 };
 395
 396 /*
 397  * Quota change
 398  * Describes an allocation change for a particular
 399  * user or group.
 400  */
 401
 402 #define GFS2_QCF_USER           0x00000001
 403
 404 struct gfs2_quota_change {
 405         __be64 qc_change;
 406         __be32 qc_flags;        /* GFS2_QCF_... */
 407         __be32 qc_id;
 408 };
 409
 410 #ifdef __KERNEL__
 411 /* Translation functions */
 412
 413 extern void gfs2_inum_in(struct gfs2_inum *no, char *buf);
 414 extern void gfs2_inum_out(struct gfs2_inum *no, char *buf);
 415 extern void gfs2_sb_in(struct gfs2_sb *sb, char *buf);
 416 extern void gfs2_rindex_in(struct gfs2_rindex *ri, char *buf);
 417 extern void gfs2_rindex_out(struct gfs2_rindex *ri, char *buf);
 418 extern void gfs2_rgrp_in(struct gfs2_rgrp *rg, char *buf);
 419 extern void gfs2_rgrp_out(struct gfs2_rgrp *rg, char *buf);
 420 extern void gfs2_quota_in(struct gfs2_quota *qu, char *buf);
 421 extern void gfs2_quota_out(struct gfs2_quota *qu, char *buf);
 422 extern void gfs2_dinode_in(struct gfs2_dinode *di, char *buf);
 423 extern void gfs2_dinode_out(struct gfs2_dinode *di, char *buf);
 424 extern void gfs2_leaf_in(struct gfs2_leaf *lf, char *buf);
 425 extern void gfs2_ea_header_in(struct gfs2_ea_header *ea, char *buf);
 426 extern void gfs2_ea_header_out(struct gfs2_ea_header *ea, char *buf);
 427 extern void gfs2_log_header_in(struct gfs2_log_header *lh, char *buf);
 428 extern void gfs2_inum_range_in(struct gfs2_inum_range *ir, char *buf);
 429 extern void gfs2_inum_range_out(struct gfs2_inum_range *ir, char *buf);
 430 extern void gfs2_statfs_change_in(struct gfs2_statfs_change *sc, char *buf);
 431 extern void gfs2_statfs_change_out(struct gfs2_statfs_change *sc, char *buf);
 432 extern void gfs2_unlinked_tag_in(struct gfs2_unlinked_tag *ut, char *buf);
 433 extern void gfs2_unlinked_tag_out(struct gfs2_unlinked_tag *ut, char *buf);
 434 extern void gfs2_quota_change_in(struct gfs2_quota_change *qc, char *buf);
 435
 436 /* Printing functions */
 437
 438 extern void gfs2_inum_print(struct gfs2_inum *no);
 439 extern void gfs2_meta_header_print(struct gfs2_meta_header *mh);
 440 extern void gfs2_sb_print(struct gfs2_sb *sb);
 441 extern void gfs2_rindex_print(struct gfs2_rindex *ri);
 442 extern void gfs2_rgrp_print(struct gfs2_rgrp *rg);
 443 extern void gfs2_quota_print(struct gfs2_quota *qu);
 444 extern void gfs2_dinode_print(struct gfs2_dinode *di);
 445 extern void gfs2_dirent_print(struct gfs2_dirent *de, char *name);
 446 extern void gfs2_leaf_print(struct gfs2_leaf *lf);
 447 extern void gfs2_ea_header_print(struct gfs2_ea_header *ea, char *name);
 448 extern void gfs2_log_header_print(struct gfs2_log_header *lh);
 449 extern void gfs2_log_descriptor_print(struct gfs2_log_descriptor *ld);
 450 extern void gfs2_inum_range_print(struct gfs2_inum_range *ir);
 451 extern void gfs2_statfs_change_print(struct gfs2_statfs_change *sc);
 452 extern void gfs2_unlinked_tag_print(struct gfs2_unlinked_tag *ut);
 453 extern void gfs2_quota_change_print(struct gfs2_quota_change *qc);
 454
 455 #endif /* __KERNEL__ */
 456
 457 #endif /* __GFS2_ONDISK_DOT_H__ */