include/linux/gfs2_ondisk.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 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_QC          1400
  40 /* These are format numbers for entities contained in files */
  41 #define GFS2_FORMAT_RI          1100
  42 #define GFS2_FORMAT_DE          1200
  43 #define GFS2_FORMAT_QU          1500
  44 /* These are part of the superblock */
  45 #define GFS2_FORMAT_FS          1801
  46 #define GFS2_FORMAT_MULTI       1900
  47
  48 /*
  49  * An on-disk inode number
  50  */
  51
  52 struct gfs2_inum {
  53         __be64 no_formal_ino;
  54         __be64 no_addr;
  55 };
  56
  57 struct gfs2_inum_host {
  58         __u64 no_formal_ino;
  59         __u64 no_addr;
  60 };
  61
  62 static inline int gfs2_inum_equal(const struct gfs2_inum_host *ino1,
  63                                   const struct gfs2_inum_host *ino2)
  64 {
  65         return ino1->no_formal_ino == ino2->no_formal_ino &&
  66                ino1->no_addr == ino2->no_addr;
  67 }
  68
  69 /*
  70  * Generic metadata head structure
  71  * Every inplace buffer logged in the journal must start with this.
  72  */
  73
  74 #define GFS2_METATYPE_NONE      0
  75 #define GFS2_METATYPE_SB        1
  76 #define GFS2_METATYPE_RG        2
  77 #define GFS2_METATYPE_RB        3
  78 #define GFS2_METATYPE_DI        4
  79 #define GFS2_METATYPE_IN        5
  80 #define GFS2_METATYPE_LF        6
  81 #define GFS2_METATYPE_JD        7
  82 #define GFS2_METATYPE_LH        8
  83 #define GFS2_METATYPE_LD        9
  84 #define GFS2_METATYPE_LB        12
  85 #define GFS2_METATYPE_EA        10
  86 #define GFS2_METATYPE_ED        11
  87 #define GFS2_METATYPE_QC        14
  88
  89 struct gfs2_meta_header {
  90         __be32 mh_magic;
  91         __be32 mh_type;
  92         __be64 __pad0;          /* Was generation number in gfs1 */
  93         __be32 mh_format;
  94         __be32 __pad1;          /* Was incarnation number in gfs1 */
  95 };
  96
  97 struct gfs2_meta_header_host {
  98         __u32 mh_magic;
  99         __u32 mh_type;
 100         __u32 mh_format;
 101 };
 102
 103 /*
 104  * super-block structure
 105  *
 106  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
 107  *
 108  * Order is important, need to be able to read old superblocks to do on-disk
 109  * version upgrades.
 110  */
 111
 112 /* Address of superblock in GFS2 basic blocks */
 113 #define GFS2_SB_ADDR            128
 114
 115 /* The lock number for the superblock (must be zero) */
 116 #define GFS2_SB_LOCK            0
 117
 118 /* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
 119    Includes: the fencing zero at the end */
 120 #define GFS2_LOCKNAME_LEN       64
 121
 122 struct gfs2_sb {
 123         struct gfs2_meta_header sb_header;
 124
 125         __be32 sb_fs_format;
 126         __be32 sb_multihost_format;
 127         __u32  __pad0;  /* Was superblock flags in gfs1 */
 128
 129         __be32 sb_bsize;
 130         __be32 sb_bsize_shift;
 131         __u32 __pad1;   /* Was journal segment size in gfs1 */
 132
 133         struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 134         struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 135         struct gfs2_inum sb_root_dir;
 136
 137         char sb_lockproto[GFS2_LOCKNAME_LEN];
 138         char sb_locktable[GFS2_LOCKNAME_LEN];
 139         /* In gfs1, quota and license dinodes followed */
 140 };
 141
 142 struct gfs2_sb_host {
 143         struct gfs2_meta_header_host sb_header;
 144
 145         __u32 sb_fs_format;
 146         __u32 sb_multihost_format;
 147
 148         __u32 sb_bsize;
 149         __u32 sb_bsize_shift;
 150
 151         struct gfs2_inum_host sb_master_dir; /* Was jindex dinode in gfs1 */
 152         struct gfs2_inum_host sb_root_dir;
 153
 154         char sb_lockproto[GFS2_LOCKNAME_LEN];
 155         char sb_locktable[GFS2_LOCKNAME_LEN];
 156         /* In gfs1, quota and license dinodes followed */
 157 };
 158
 159 /*
 160  * resource index structure
 161  */
 162
 163 struct gfs2_rindex {
 164         __be64 ri_addr; /* grp block disk address */
 165         __be32 ri_length;       /* length of rgrp header in fs blocks */
 166         __u32 __pad;
 167
 168         __be64 ri_data0;        /* first data location */
 169         __be32 ri_data; /* num of data blocks in rgrp */
 170
 171         __be32 ri_bitbytes;     /* number of bytes in data bitmaps */
 172
 173         __u8 ri_reserved[64];
 174 };
 175
 176 struct gfs2_rindex_host {
 177         __u64 ri_addr;  /* grp block disk address */
 178         __u64 ri_data0; /* first data location */
 179         __u32 ri_length;        /* length of rgrp header in fs blocks */
 180         __u32 ri_data;  /* num of data blocks in rgrp */
 181         __u32 ri_bitbytes;      /* number of bytes in data bitmaps */
 182 };
 183
 184 /*
 185  * resource group header structure
 186  */
 187
 188 /* Number of blocks per byte in rgrp */
 189 #define GFS2_NBBY               4
 190 #define GFS2_BIT_SIZE           2
 191 #define GFS2_BIT_MASK           0x00000003
 192
 193 #define GFS2_BLKST_FREE         0
 194 #define GFS2_BLKST_USED         1
 195 #define GFS2_BLKST_UNLINKED     2
 196 #define GFS2_BLKST_DINODE       3
 197
 198 #define GFS2_RGF_JOURNAL        0x00000001
 199 #define GFS2_RGF_METAONLY       0x00000002
 200 #define GFS2_RGF_DATAONLY       0x00000004
 201 #define GFS2_RGF_NOALLOC        0x00000008
 202
 203 struct gfs2_rgrp {
 204         struct gfs2_meta_header rg_header;
 205
 206         __be32 rg_flags;
 207         __be32 rg_free;
 208         __be32 rg_dinodes;
 209         __be32 __pad;
 210         __be64 rg_igeneration;
 211
 212         __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
 213 };
 214
 215 struct gfs2_rgrp_host {
 216         __u32 rg_flags;
 217         __u32 rg_free;
 218         __u32 rg_dinodes;
 219         __u64 rg_igeneration;
 220 };
 221
 222 /*
 223  * quota structure
 224  */
 225
 226 struct gfs2_quota {
 227         __be64 qu_limit;
 228         __be64 qu_warn;
 229         __be64 qu_value;
 230         __u8 qu_reserved[64];
 231 };
 232
 233 struct gfs2_quota_host {
 234         __u64 qu_limit;
 235         __u64 qu_warn;
 236         __u64 qu_value;
 237 };
 238
 239 /*
 240  * dinode structure
 241  */
 242
 243 #define GFS2_MAX_META_HEIGHT    10
 244 #define GFS2_DIR_MAX_DEPTH      17
 245
 246 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
 247 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
 248
 249 enum {
 250         gfs2fl_Jdata            = 0,
 251         gfs2fl_ExHash           = 1,
 252         gfs2fl_Unused           = 2,
 253         gfs2fl_EaIndirect       = 3,
 254         gfs2fl_Directio         = 4,
 255         gfs2fl_Immutable        = 5,
 256         gfs2fl_AppendOnly       = 6,
 257         gfs2fl_NoAtime          = 7,
 258         gfs2fl_Sync             = 8,
 259         gfs2fl_System           = 9,
 260         gfs2fl_TruncInProg      = 29,
 261         gfs2fl_InheritDirectio  = 30,
 262         gfs2fl_InheritJdata     = 31,
 263 };
 264
 265 /* Dinode flags */
 266 #define GFS2_DIF_JDATA                  0x00000001
 267 #define GFS2_DIF_EXHASH                 0x00000002
 268 #define GFS2_DIF_UNUSED                 0x00000004  /* only in gfs1 */
 269 #define GFS2_DIF_EA_INDIRECT            0x00000008
 270 #define GFS2_DIF_DIRECTIO               0x00000010
 271 #define GFS2_DIF_IMMUTABLE              0x00000020
 272 #define GFS2_DIF_APPENDONLY             0x00000040
 273 #define GFS2_DIF_NOATIME                0x00000080
 274 #define GFS2_DIF_SYNC                   0x00000100
 275 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
 276 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
 277 #define GFS2_DIF_INHERIT_DIRECTIO       0x40000000
 278 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 279
 280 struct gfs2_dinode {
 281         struct gfs2_meta_header di_header;
 282
 283         struct gfs2_inum di_num;
 284
 285         __be32 di_mode; /* mode of file */
 286         __be32 di_uid;  /* owner's user id */
 287         __be32 di_gid;  /* owner's group id */
 288         __be32 di_nlink;        /* number of links to this file */
 289         __be64 di_size; /* number of bytes in file */
 290         __be64 di_blocks;       /* number of blocks in file */
 291         __be64 di_atime;        /* time last accessed */
 292         __be64 di_mtime;        /* time last modified */
 293         __be64 di_ctime;        /* time last changed */
 294         __be32 di_major;        /* device major number */
 295         __be32 di_minor;        /* device minor number */
 296
 297         /* This section varies from gfs1. Padding added to align with
 298          * remainder of dinode
 299          */
 300         __be64 di_goal_meta;    /* rgrp to alloc from next */
 301         __be64 di_goal_data;    /* data block goal */
 302         __be64 di_generation;   /* generation number for NFS */
 303
 304         __be32 di_flags;        /* GFS2_DIF_... */
 305         __be32 di_payload_format;  /* GFS2_FORMAT_... */
 306         __u16 __pad1;   /* Was ditype in gfs1 */
 307         __be16 di_height;       /* height of metadata */
 308         __u32 __pad2;   /* Unused incarnation number from gfs1 */
 309
 310         /* These only apply to directories  */
 311         __u16 __pad3;   /* Padding */
 312         __be16 di_depth;        /* Number of bits in the table */
 313         __be32 di_entries;      /* The number of entries in the directory */
 314
 315         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 316
 317         __be64 di_eattr;        /* extended attribute block number */
 318
 319         __u8 di_reserved[56];
 320 };
 321
 322 struct gfs2_dinode_host {
 323         __u64 di_size;  /* number of bytes in file */
 324         __u64 di_blocks;        /* number of blocks in file */
 325
 326         /* This section varies from gfs1. Padding added to align with
 327          * remainder of dinode
 328          */
 329         __u64 di_goal_meta;     /* rgrp to alloc from next */
 330         __u64 di_goal_data;     /* data block goal */
 331         __u64 di_generation;    /* generation number for NFS */
 332
 333         __u32 di_flags; /* GFS2_DIF_... */
 334         __u16 di_height;        /* height of metadata */
 335
 336         /* These only apply to directories  */
 337         __u16 di_depth; /* Number of bits in the table */
 338         __u32 di_entries;       /* The number of entries in the directory */
 339
 340         __u64 di_eattr; /* extended attribute block number */
 341 };
 342
 343 /*
 344  * directory structure - many of these per directory file
 345  */
 346
 347 #define GFS2_FNAMESIZE          255
 348 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
 349
 350 struct gfs2_dirent {
 351         struct gfs2_inum de_inum;
 352         __be32 de_hash;
 353         __be16 de_rec_len;
 354         __be16 de_name_len;
 355         __be16 de_type;
 356         __u8 __pad[14];
 357 };
 358
 359 /*
 360  * Header of leaf directory nodes
 361  */
 362
 363 struct gfs2_leaf {
 364         struct gfs2_meta_header lf_header;
 365
 366         __be16 lf_depth;                /* Depth of leaf */
 367         __be16 lf_entries;              /* Number of dirents in leaf */
 368         __be32 lf_dirent_format;        /* Format of the dirents */
 369         __be64 lf_next;                 /* Next leaf, if overflow */
 370
 371         __u8 lf_reserved[64];
 372 };
 373
 374 /*
 375  * Extended attribute header format
 376  */
 377
 378 #define GFS2_EA_MAX_NAME_LEN    255
 379 #define GFS2_EA_MAX_DATA_LEN    65536
 380
 381 #define GFS2_EATYPE_UNUSED      0
 382 #define GFS2_EATYPE_USR         1
 383 #define GFS2_EATYPE_SYS         2
 384 #define GFS2_EATYPE_SECURITY    3
 385
 386 #define GFS2_EATYPE_LAST        3
 387 #define GFS2_EATYPE_VALID(x)    ((x) <= GFS2_EATYPE_LAST)
 388
 389 #define GFS2_EAFLAG_LAST        0x01    /* last ea in block */
 390
 391 struct gfs2_ea_header {
 392         __be32 ea_rec_len;
 393         __be32 ea_data_len;
 394         __u8 ea_name_len;       /* no NULL pointer after the string */
 395         __u8 ea_type;           /* GFS2_EATYPE_... */
 396         __u8 ea_flags;          /* GFS2_EAFLAG_... */
 397         __u8 ea_num_ptrs;
 398         __u32 __pad;
 399 };
 400
 401 /*
 402  * Log header structure
 403  */
 404
 405 #define GFS2_LOG_HEAD_UNMOUNT   0x00000001      /* log is clean */
 406
 407 struct gfs2_log_header {
 408         struct gfs2_meta_header lh_header;
 409
 410         __be64 lh_sequence;     /* Sequence number of this transaction */
 411         __be32 lh_flags;        /* GFS2_LOG_HEAD_... */
 412         __be32 lh_tail;         /* Block number of log tail */
 413         __be32 lh_blkno;
 414         __be32 lh_hash;
 415 };
 416
 417 struct gfs2_log_header_host {
 418         struct gfs2_meta_header_host lh_header;
 419
 420         __u64 lh_sequence;      /* Sequence number of this transaction */
 421         __u32 lh_flags; /* GFS2_LOG_HEAD_... */
 422         __u32 lh_tail;          /* Block number of log tail */
 423         __u32 lh_blkno;
 424         __u32 lh_hash;
 425 };
 426
 427 /*
 428  * Log type descriptor
 429  */
 430
 431 #define GFS2_LOG_DESC_METADATA  300
 432 /* ld_data1 is the number of metadata blocks in the descriptor.
 433    ld_data2 is unused. */
 434
 435 #define GFS2_LOG_DESC_REVOKE    301
 436 /* ld_data1 is the number of revoke blocks in the descriptor.
 437    ld_data2 is unused. */
 438
 439 #define GFS2_LOG_DESC_JDATA     302
 440 /* ld_data1 is the number of data blocks in the descriptor.
 441    ld_data2 is unused. */
 442
 443 struct gfs2_log_descriptor {
 444         struct gfs2_meta_header ld_header;
 445
 446         __be32 ld_type;         /* GFS2_LOG_DESC_... */
 447         __be32 ld_length;       /* Number of buffers in this chunk */
 448         __be32 ld_data1;        /* descriptor-specific field */
 449         __be32 ld_data2;        /* descriptor-specific field */
 450
 451         __u8 ld_reserved[32];
 452 };
 453
 454 /*
 455  * Inum Range
 456  * Describe a range of formal inode numbers allocated to
 457  * one machine to assign to inodes.
 458  */
 459
 460 #define GFS2_INUM_QUANTUM       1048576
 461
 462 struct gfs2_inum_range {
 463         __be64 ir_start;
 464         __be64 ir_length;
 465 };
 466
 467 struct gfs2_inum_range_host {
 468         __u64 ir_start;
 469         __u64 ir_length;
 470 };
 471
 472 /*
 473  * Statfs change
 474  * Describes an change to the pool of free and allocated
 475  * blocks.
 476  */
 477
 478 struct gfs2_statfs_change {
 479         __be64 sc_total;
 480         __be64 sc_free;
 481         __be64 sc_dinodes;
 482 };
 483
 484 struct gfs2_statfs_change_host {
 485         __u64 sc_total;
 486         __u64 sc_free;
 487         __u64 sc_dinodes;
 488 };
 489
 490 /*
 491  * Quota change
 492  * Describes an allocation change for a particular
 493  * user or group.
 494  */
 495
 496 #define GFS2_QCF_USER           0x00000001
 497
 498 struct gfs2_quota_change {
 499         __be64 qc_change;
 500         __be32 qc_flags;        /* GFS2_QCF_... */
 501         __be32 qc_id;
 502 };
 503
 504 struct gfs2_quota_change_host {
 505         __u64 qc_change;
 506         __u32 qc_flags; /* GFS2_QCF_... */
 507         __u32 qc_id;
 508 };
 509
 510 #ifdef __KERNEL__
 511 /* Translation functions */
 512
 513 extern void gfs2_inum_in(struct gfs2_inum_host *no, const void *buf);
 514 extern void gfs2_inum_out(const struct gfs2_inum_host *no, void *buf);
 515 extern void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf);
 516 extern void gfs2_rindex_in(struct gfs2_rindex_host *ri, const void *buf);
 517 extern void gfs2_rindex_out(const struct gfs2_rindex_host *ri, void *buf);
 518 extern void gfs2_rgrp_in(struct gfs2_rgrp_host *rg, const void *buf);
 519 extern void gfs2_rgrp_out(const struct gfs2_rgrp_host *rg, void *buf);
 520 extern void gfs2_quota_in(struct gfs2_quota_host *qu, const void *buf);
 521 struct gfs2_inode;
 522 extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
 523 extern void gfs2_ea_header_in(struct gfs2_ea_header *ea, const void *buf);
 524 extern void gfs2_ea_header_out(const struct gfs2_ea_header *ea, void *buf);
 525 extern void gfs2_log_header_in(struct gfs2_log_header_host *lh, const void *buf);
 526 extern void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf);
 527 extern void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf);
 528 extern void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf);
 529 extern void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf);
 530 extern void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf);
 531
 532 /* Printing functions */
 533
 534 extern void gfs2_rindex_print(const struct gfs2_rindex_host *ri);
 535 extern void gfs2_dinode_print(const struct gfs2_inode *ip);
 536
 537 #endif /* __KERNEL__ */
 538
 539 #endif /* __GFS2_ONDISK_DOT_H__ */