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 #include <linux/types.h>
  14
  15 #define GFS2_MAGIC              0x01161970
  16 #define GFS2_BASIC_BLOCK        512
  17 #define GFS2_BASIC_BLOCK_SHIFT  9
  18
  19 /* Lock numbers of the LM_TYPE_NONDISK type */
  20
  21 #define GFS2_MOUNT_LOCK         0
  22 #define GFS2_LIVE_LOCK          1
  23 #define GFS2_TRANS_LOCK         2
  24 #define GFS2_RENAME_LOCK        3
  25 #define GFS2_CONTROL_LOCK       4
  26 #define GFS2_MOUNTED_LOCK       5
  27
  28 /* Format numbers for various metadata types */
  29
  30 #define GFS2_FORMAT_NONE        0
  31 #define GFS2_FORMAT_SB          100
  32 #define GFS2_FORMAT_RG          200
  33 #define GFS2_FORMAT_RB          300
  34 #define GFS2_FORMAT_DI          400
  35 #define GFS2_FORMAT_IN          500
  36 #define GFS2_FORMAT_LF          600
  37 #define GFS2_FORMAT_JD          700
  38 #define GFS2_FORMAT_LH          800
  39 #define GFS2_FORMAT_LD          900
  40 #define GFS2_FORMAT_LB          1000
  41 #define GFS2_FORMAT_EA          1600
  42 #define GFS2_FORMAT_ED          1700
  43 #define GFS2_FORMAT_QC          1400
  44 /* These are format numbers for entities contained in files */
  45 #define GFS2_FORMAT_RI          1100
  46 #define GFS2_FORMAT_DE          1200
  47 #define GFS2_FORMAT_QU          1500
  48 /* These are part of the superblock */
  49 #define GFS2_FORMAT_FS          1801
  50 #define GFS2_FORMAT_MULTI       1900
  51
  52 /*
  53  * An on-disk inode number
  54  */
  55
  56 struct gfs2_inum {
  57         __be64 no_formal_ino;
  58         __be64 no_addr;
  59 };
  60
  61 /*
  62  * Generic metadata head structure
  63  * Every inplace buffer logged in the journal must start with this.
  64  */
  65
  66 #define GFS2_METATYPE_NONE      0
  67 #define GFS2_METATYPE_SB        1
  68 #define GFS2_METATYPE_RG        2
  69 #define GFS2_METATYPE_RB        3
  70 #define GFS2_METATYPE_DI        4
  71 #define GFS2_METATYPE_IN        5
  72 #define GFS2_METATYPE_LF        6
  73 #define GFS2_METATYPE_JD        7
  74 #define GFS2_METATYPE_LH        8
  75 #define GFS2_METATYPE_LD        9
  76 #define GFS2_METATYPE_LB        12
  77 #define GFS2_METATYPE_EA        10
  78 #define GFS2_METATYPE_ED        11
  79 #define GFS2_METATYPE_QC        14
  80
  81 struct gfs2_meta_header {
  82         __be32 mh_magic;
  83         __be32 mh_type;
  84         __be64 __pad0;          /* Was generation number in gfs1 */
  85         __be32 mh_format;
  86         /* This union is to keep userspace happy */
  87         union {
  88                 __be32 mh_jid;          /* Was incarnation number in gfs1 */
  89                 __be32 __pad1;
  90         };
  91 };
  92
  93 /*
  94  * super-block structure
  95  *
  96  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
  97  *
  98  * Order is important, need to be able to read old superblocks to do on-disk
  99  * version upgrades.
 100  */
 101
 102 /* Address of superblock in GFS2 basic blocks */
 103 #define GFS2_SB_ADDR            128
 104
 105 /* The lock number for the superblock (must be zero) */
 106 #define GFS2_SB_LOCK            0
 107
 108 /* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
 109    Includes: the fencing zero at the end */
 110 #define GFS2_LOCKNAME_LEN       64
 111
 112 struct gfs2_sb {
 113         struct gfs2_meta_header sb_header;
 114
 115         __be32 sb_fs_format;
 116         __be32 sb_multihost_format;
 117         __u32  __pad0;  /* Was superblock flags in gfs1 */
 118
 119         __be32 sb_bsize;
 120         __be32 sb_bsize_shift;
 121         __u32 __pad1;   /* Was journal segment size in gfs1 */
 122
 123         struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 124         struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 125         struct gfs2_inum sb_root_dir;
 126
 127         char sb_lockproto[GFS2_LOCKNAME_LEN];
 128         char sb_locktable[GFS2_LOCKNAME_LEN];
 129
 130         struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
 131         struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
 132 #define GFS2_HAS_UUID 1
 133         __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */
 134 };
 135
 136 /*
 137  * resource index structure
 138  */
 139
 140 struct gfs2_rindex {
 141         __be64 ri_addr; /* grp block disk address */
 142         __be32 ri_length;       /* length of rgrp header in fs blocks */
 143         __u32 __pad;
 144
 145         __be64 ri_data0;        /* first data location */
 146         __be32 ri_data; /* num of data blocks in rgrp */
 147
 148         __be32 ri_bitbytes;     /* number of bytes in data bitmaps */
 149
 150         __u8 ri_reserved[64];
 151 };
 152
 153 /*
 154  * resource group header structure
 155  */
 156
 157 /* Number of blocks per byte in rgrp */
 158 #define GFS2_NBBY               4
 159 #define GFS2_BIT_SIZE           2
 160 #define GFS2_BIT_MASK           0x00000003
 161
 162 #define GFS2_BLKST_FREE         0
 163 #define GFS2_BLKST_USED         1
 164 #define GFS2_BLKST_UNLINKED     2
 165 #define GFS2_BLKST_DINODE       3
 166
 167 #define GFS2_RGF_JOURNAL        0x00000001
 168 #define GFS2_RGF_METAONLY       0x00000002
 169 #define GFS2_RGF_DATAONLY       0x00000004
 170 #define GFS2_RGF_NOALLOC        0x00000008
 171 #define GFS2_RGF_TRIMMED        0x00000010
 172
 173 struct gfs2_rgrp_lvb {
 174         __be32 rl_magic;
 175         __be32 rl_flags;
 176         __be32 rl_free;
 177         __be32 rl_dinodes;
 178         __be64 rl_igeneration;
 179         __be32 rl_unlinked;
 180         __be32 __pad;
 181 };
 182
 183 struct gfs2_rgrp {
 184         struct gfs2_meta_header rg_header;
 185
 186         __be32 rg_flags;
 187         __be32 rg_free;
 188         __be32 rg_dinodes;
 189         __be32 __pad;
 190         __be64 rg_igeneration;
 191
 192         __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
 193 };
 194
 195 /*
 196  * quota structure
 197  */
 198
 199 struct gfs2_quota {
 200         __be64 qu_limit;
 201         __be64 qu_warn;
 202         __be64 qu_value;
 203         __u8 qu_reserved[64];
 204 };
 205
 206 /*
 207  * dinode structure
 208  */
 209
 210 #define GFS2_MAX_META_HEIGHT    10
 211 #define GFS2_DIR_MAX_DEPTH      17
 212
 213 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
 214 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
 215
 216 enum {
 217         gfs2fl_Jdata            = 0,
 218         gfs2fl_ExHash           = 1,
 219         gfs2fl_Unused           = 2,
 220         gfs2fl_EaIndirect       = 3,
 221         gfs2fl_Directio         = 4,
 222         gfs2fl_Immutable        = 5,
 223         gfs2fl_AppendOnly       = 6,
 224         gfs2fl_NoAtime          = 7,
 225         gfs2fl_Sync             = 8,
 226         gfs2fl_System           = 9,
 227         gfs2fl_TopLevel         = 10,
 228         gfs2fl_TruncInProg      = 29,
 229         gfs2fl_InheritDirectio  = 30,
 230         gfs2fl_InheritJdata     = 31,
 231 };
 232
 233 /* Dinode flags */
 234 #define GFS2_DIF_JDATA                  0x00000001
 235 #define GFS2_DIF_EXHASH                 0x00000002
 236 #define GFS2_DIF_UNUSED                 0x00000004  /* only in gfs1 */
 237 #define GFS2_DIF_EA_INDIRECT            0x00000008
 238 #define GFS2_DIF_DIRECTIO               0x00000010
 239 #define GFS2_DIF_IMMUTABLE              0x00000020
 240 #define GFS2_DIF_APPENDONLY             0x00000040
 241 #define GFS2_DIF_NOATIME                0x00000080
 242 #define GFS2_DIF_SYNC                   0x00000100
 243 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
 244 #define GFS2_DIF_TOPDIR                 0x00000400 /* New in gfs2 */
 245 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
 246 #define GFS2_DIF_INHERIT_DIRECTIO       0x40000000 /* only in gfs1 */
 247 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 248
 249 struct gfs2_dinode {
 250         struct gfs2_meta_header di_header;
 251
 252         struct gfs2_inum di_num;
 253
 254         __be32 di_mode; /* mode of file */
 255         __be32 di_uid;  /* owner's user id */
 256         __be32 di_gid;  /* owner's group id */
 257         __be32 di_nlink;        /* number of links to this file */
 258         __be64 di_size; /* number of bytes in file */
 259         __be64 di_blocks;       /* number of blocks in file */
 260         __be64 di_atime;        /* time last accessed */
 261         __be64 di_mtime;        /* time last modified */
 262         __be64 di_ctime;        /* time last changed */
 263         __be32 di_major;        /* device major number */
 264         __be32 di_minor;        /* device minor number */
 265
 266         /* This section varies from gfs1. Padding added to align with
 267          * remainder of dinode
 268          */
 269         __be64 di_goal_meta;    /* rgrp to alloc from next */
 270         __be64 di_goal_data;    /* data block goal */
 271         __be64 di_generation;   /* generation number for NFS */
 272
 273         __be32 di_flags;        /* GFS2_DIF_... */
 274         __be32 di_payload_format;  /* GFS2_FORMAT_... */
 275         __u16 __pad1;   /* Was ditype in gfs1 */
 276         __be16 di_height;       /* height of metadata */
 277         __u32 __pad2;   /* Unused incarnation number from gfs1 */
 278
 279         /* These only apply to directories  */
 280         __u16 __pad3;   /* Padding */
 281         __be16 di_depth;        /* Number of bits in the table */
 282         __be32 di_entries;      /* The number of entries in the directory */
 283
 284         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 285
 286         __be64 di_eattr;        /* extended attribute block number */
 287         __be32 di_atime_nsec;   /* nsec portion of atime */
 288         __be32 di_mtime_nsec;   /* nsec portion of mtime */
 289         __be32 di_ctime_nsec;   /* nsec portion of ctime */
 290
 291         __u8 di_reserved[44];
 292 };
 293
 294 /*
 295  * directory structure - many of these per directory file
 296  */
 297
 298 #define GFS2_FNAMESIZE          255
 299 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
 300
 301 struct gfs2_dirent {
 302         struct gfs2_inum de_inum;
 303         __be32 de_hash;
 304         __be16 de_rec_len;
 305         __be16 de_name_len;
 306         __be16 de_type;
 307         __u8 __pad[14];
 308 };
 309
 310 /*
 311  * Header of leaf directory nodes
 312  */
 313
 314 struct gfs2_leaf {
 315         struct gfs2_meta_header lf_header;
 316
 317         __be16 lf_depth;                /* Depth of leaf */
 318         __be16 lf_entries;              /* Number of dirents in leaf */
 319         __be32 lf_dirent_format;        /* Format of the dirents */
 320         __be64 lf_next;                 /* Next leaf, if overflow */
 321
 322         __u8 lf_reserved[64];
 323 };
 324
 325 /*
 326  * Extended attribute header format
 327  *
 328  * This works in a similar way to dirents. There is a fixed size header
 329  * followed by a variable length section made up of the name and the
 330  * associated data. In the case of a "stuffed" entry, the value is
 331  * inline directly after the name, the ea_num_ptrs entry will be
 332  * zero in that case. For non-"stuffed" entries, there will be
 333  * a set of pointers (aligned to 8 byte boundary) to the block(s)
 334  * containing the value.
 335  *
 336  * The blocks containing the values and the blocks containing the
 337  * extended attribute headers themselves all start with the common
 338  * metadata header. Each inode, if it has extended attributes, will
 339  * have either a single block containing the extended attribute headers
 340  * or a single indirect block pointing to blocks containing the
 341  * extended attribure headers.
 342  *
 343  * The maximim size of the data part of an extended attribute is 64k
 344  * so the number of blocks required depends upon block size. Since the
 345  * block size also determines the number of pointers in an indirect
 346  * block, its a fairly complicated calculation to work out the maximum
 347  * number of blocks that an inode may have relating to extended attributes.
 348  *
 349  */
 350
 351 #define GFS2_EA_MAX_NAME_LEN    255
 352 #define GFS2_EA_MAX_DATA_LEN    65536
 353
 354 #define GFS2_EATYPE_UNUSED      0
 355 #define GFS2_EATYPE_USR         1
 356 #define GFS2_EATYPE_SYS         2
 357 #define GFS2_EATYPE_SECURITY    3
 358
 359 #define GFS2_EATYPE_LAST        3
 360 #define GFS2_EATYPE_VALID(x)    ((x) <= GFS2_EATYPE_LAST)
 361
 362 #define GFS2_EAFLAG_LAST        0x01    /* last ea in block */
 363
 364 struct gfs2_ea_header {
 365         __be32 ea_rec_len;
 366         __be32 ea_data_len;
 367         __u8 ea_name_len;       /* no NULL pointer after the string */
 368         __u8 ea_type;           /* GFS2_EATYPE_... */
 369         __u8 ea_flags;          /* GFS2_EAFLAG_... */
 370         __u8 ea_num_ptrs;
 371         __u32 __pad;
 372 };
 373
 374 /*
 375  * Log header structure
 376  */
 377
 378 #define GFS2_LOG_HEAD_UNMOUNT   0x00000001      /* log is clean */
 379
 380 struct gfs2_log_header {
 381         struct gfs2_meta_header lh_header;
 382
 383         __be64 lh_sequence;     /* Sequence number of this transaction */
 384         __be32 lh_flags;        /* GFS2_LOG_HEAD_... */
 385         __be32 lh_tail;         /* Block number of log tail */
 386         __be32 lh_blkno;
 387         __be32 lh_hash;
 388 };
 389
 390 /*
 391  * Log type descriptor
 392  */
 393
 394 #define GFS2_LOG_DESC_METADATA  300
 395 /* ld_data1 is the number of metadata blocks in the descriptor.
 396    ld_data2 is unused. */
 397
 398 #define GFS2_LOG_DESC_REVOKE    301
 399 /* ld_data1 is the number of revoke blocks in the descriptor.
 400    ld_data2 is unused. */
 401
 402 #define GFS2_LOG_DESC_JDATA     302
 403 /* ld_data1 is the number of data blocks in the descriptor.
 404    ld_data2 is unused. */
 405
 406 struct gfs2_log_descriptor {
 407         struct gfs2_meta_header ld_header;
 408
 409         __be32 ld_type;         /* GFS2_LOG_DESC_... */
 410         __be32 ld_length;       /* Number of buffers in this chunk */
 411         __be32 ld_data1;        /* descriptor-specific field */
 412         __be32 ld_data2;        /* descriptor-specific field */
 413
 414         __u8 ld_reserved[32];
 415 };
 416
 417 /*
 418  * Inum Range
 419  * Describe a range of formal inode numbers allocated to
 420  * one machine to assign to inodes.
 421  */
 422
 423 #define GFS2_INUM_QUANTUM       1048576
 424
 425 struct gfs2_inum_range {
 426         __be64 ir_start;
 427         __be64 ir_length;
 428 };
 429
 430 /*
 431  * Statfs change
 432  * Describes an change to the pool of free and allocated
 433  * blocks.
 434  */
 435
 436 struct gfs2_statfs_change {
 437         __be64 sc_total;
 438         __be64 sc_free;
 439         __be64 sc_dinodes;
 440 };
 441
 442 /*
 443  * Quota change
 444  * Describes an allocation change for a particular
 445  * user or group.
 446  */
 447
 448 #define GFS2_QCF_USER           0x00000001
 449
 450 struct gfs2_quota_change {
 451         __be64 qc_change;
 452         __be32 qc_flags;        /* GFS2_QCF_... */
 453         __be32 qc_id;
 454 };
 455
 456 struct gfs2_quota_lvb {
 457         __be32 qb_magic;
 458         __u32 __pad;
 459         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 460         __be64 qb_warn;       /* Warn user when alloc is above this # */
 461         __be64 qb_value;       /* Current # blocks allocated */
 462 };
 463
 464 #endif /* __GFS2_ONDISK_DOT_H__ */