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