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 static inline int gfs2_inum_equal(const struct gfs2_inum *ino1,
  58                                   const struct gfs2_inum *ino2)
  59 {
  60         return ino1->no_formal_ino == ino2->no_formal_ino &&
  61                ino1->no_addr == ino2->no_addr;
  62 }
  63
  64 /*
  65  * Generic metadata head structure
  66  * Every inplace buffer logged in the journal must start with this.
  67  */
  68
  69 #define GFS2_METATYPE_NONE      0
  70 #define GFS2_METATYPE_SB        1
  71 #define GFS2_METATYPE_RG        2
  72 #define GFS2_METATYPE_RB        3
  73 #define GFS2_METATYPE_DI        4
  74 #define GFS2_METATYPE_IN        5
  75 #define GFS2_METATYPE_LF        6
  76 #define GFS2_METATYPE_JD        7
  77 #define GFS2_METATYPE_LH        8
  78 #define GFS2_METATYPE_LD        9
  79 #define GFS2_METATYPE_LB        12
  80 #define GFS2_METATYPE_EA        10
  81 #define GFS2_METATYPE_ED        11
  82 #define GFS2_METATYPE_QC        14
  83
  84 struct gfs2_meta_header {
  85         __be32 mh_magic;
  86         __be32 mh_type;
  87         __be64 __pad0;          /* Was generation number in gfs1 */
  88         __be32 mh_format;
  89         __be32 __pad1;          /* Was incarnation number in gfs1 */
  90 };
  91
  92 /*
  93  * super-block structure
  94  *
  95  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
  96  *
  97  * Order is important, need to be able to read old superblocks to do on-disk
  98  * version upgrades.
  99  */
 100
 101 /* Address of superblock in GFS2 basic blocks */
 102 #define GFS2_SB_ADDR            128
 103
 104 /* The lock number for the superblock (must be zero) */
 105 #define GFS2_SB_LOCK            0
 106
 107 /* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
 108    Includes: the fencing zero at the end */
 109 #define GFS2_LOCKNAME_LEN       64
 110
 111 struct gfs2_sb {
 112         struct gfs2_meta_header sb_header;
 113
 114         __be32 sb_fs_format;
 115         __be32 sb_multihost_format;
 116         __u32  __pad0;  /* Was superblock flags in gfs1 */
 117
 118         __be32 sb_bsize;
 119         __be32 sb_bsize_shift;
 120         __u32 __pad1;   /* Was journal segment size in gfs1 */
 121
 122         struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 123         struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 124         struct gfs2_inum sb_root_dir;
 125
 126         char sb_lockproto[GFS2_LOCKNAME_LEN];
 127         char sb_locktable[GFS2_LOCKNAME_LEN];
 128         /* In gfs1, quota and license dinodes followed */
 129 };
 130
 131 /*
 132  * resource index structure
 133  */
 134
 135 struct gfs2_rindex {
 136         __be64 ri_addr; /* grp block disk address */
 137         __be32 ri_length;       /* length of rgrp header in fs blocks */
 138         __u32 __pad;
 139
 140         __be64 ri_data0;        /* first data location */
 141         __be32 ri_data; /* num of data blocks in rgrp */
 142
 143         __be32 ri_bitbytes;     /* number of bytes in data bitmaps */
 144
 145         __u8 ri_reserved[64];
 146 };
 147
 148 /*
 149  * resource group header structure
 150  */
 151
 152 /* Number of blocks per byte in rgrp */
 153 #define GFS2_NBBY               4
 154 #define GFS2_BIT_SIZE           2
 155 #define GFS2_BIT_MASK           0x00000003
 156
 157 #define GFS2_BLKST_FREE         0
 158 #define GFS2_BLKST_USED         1
 159 #define GFS2_BLKST_UNLINKED     2
 160 #define GFS2_BLKST_DINODE       3
 161
 162 #define GFS2_RGF_JOURNAL        0x00000001
 163 #define GFS2_RGF_METAONLY       0x00000002
 164 #define GFS2_RGF_DATAONLY       0x00000004
 165 #define GFS2_RGF_NOALLOC        0x00000008
 166
 167 struct gfs2_rgrp {
 168         struct gfs2_meta_header rg_header;
 169
 170         __be32 rg_flags;
 171         __be32 rg_free;
 172         __be32 rg_dinodes;
 173
 174         __u8 rg_reserved[92]; /* Several fields from gfs1 now reserved */
 175 };
 176
 177 /*
 178  * quota structure
 179  */
 180
 181 struct gfs2_quota {
 182         __be64 qu_limit;
 183         __be64 qu_warn;
 184         __be64 qu_value;
 185         __u8 qu_reserved[64];
 186 };
 187
 188 /*
 189  * dinode structure
 190  */
 191
 192 #define GFS2_MAX_META_HEIGHT    10
 193 #define GFS2_DIR_MAX_DEPTH      17
 194
 195 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
 196 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
 197
 198 enum {
 199         gfs2fl_Jdata            = 0,
 200         gfs2fl_ExHash           = 1,
 201         gfs2fl_Unused           = 2,
 202         gfs2fl_EaIndirect       = 3,
 203         gfs2fl_Directio         = 4,
 204         gfs2fl_Immutable        = 5,
 205         gfs2fl_AppendOnly       = 6,
 206         gfs2fl_NoAtime          = 7,
 207         gfs2fl_Sync             = 8,
 208         gfs2fl_System           = 9,
 209         gfs2fl_TruncInProg      = 29,
 210         gfs2fl_InheritDirectio  = 30,
 211         gfs2fl_InheritJdata     = 31,
 212 };
 213
 214 /* Dinode flags */
 215 #define GFS2_DIF_JDATA                  0x00000001
 216 #define GFS2_DIF_EXHASH                 0x00000002
 217 #define GFS2_DIF_UNUSED                 0x00000004  /* only in gfs1 */
 218 #define GFS2_DIF_EA_INDIRECT            0x00000008
 219 #define GFS2_DIF_DIRECTIO               0x00000010
 220 #define GFS2_DIF_IMMUTABLE              0x00000020
 221 #define GFS2_DIF_APPENDONLY             0x00000040
 222 #define GFS2_DIF_NOATIME                0x00000080
 223 #define GFS2_DIF_SYNC                   0x00000100
 224 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
 225 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
 226 #define GFS2_DIF_INHERIT_DIRECTIO       0x40000000
 227 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 228
 229 struct gfs2_dinode {
 230         struct gfs2_meta_header di_header;
 231
 232         struct gfs2_inum di_num;
 233
 234         __be32 di_mode; /* mode of file */
 235         __be32 di_uid;  /* owner's user id */
 236         __be32 di_gid;  /* owner's group id */
 237         __be32 di_nlink;        /* number of links to this file */
 238         __be64 di_size; /* number of bytes in file */
 239         __be64 di_blocks;       /* number of blocks in file */
 240         __be64 di_atime;        /* time last accessed */
 241         __be64 di_mtime;        /* time last modified */
 242         __be64 di_ctime;        /* time last changed */
 243         __be32 di_major;        /* device major number */
 244         __be32 di_minor;        /* device minor number */
 245
 246         /* This section varies from gfs1. Padding added to align with
 247          * remainder of dinode
 248          */
 249         __be64 di_goal_meta;    /* rgrp to alloc from next */
 250         __be64 di_goal_data;    /* data block goal */
 251         __u32 __pad[2];
 252
 253         __be32 di_flags;        /* GFS2_DIF_... */
 254         __be32 di_payload_format;  /* GFS2_FORMAT_... */
 255         __u16 __pad1;   /* Was ditype in gfs1 */
 256         __be16 di_height;       /* height of metadata */
 257         __u32 __pad2;   /* Unused incarnation number from gfs1 */
 258
 259         /* These only apply to directories  */
 260         __u16 __pad3;   /* Padding */
 261         __be16 di_depth;        /* Number of bits in the table */
 262         __be32 di_entries;      /* The number of entries in the directory */
 263
 264         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 265
 266         __be64 di_eattr;        /* extended attribute block number */
 267
 268         __u8 di_reserved[56];
 269 };
 270
 271 /*
 272  * directory structure - many of these per directory file
 273  */
 274
 275 #define GFS2_FNAMESIZE          255
 276 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
 277
 278 struct gfs2_dirent {
 279         struct gfs2_inum de_inum;
 280         __be32 de_hash;
 281         __be16 de_rec_len;
 282         __be16 de_name_len;
 283         __be16 de_type;
 284         __u8 __pad[14];
 285 };
 286
 287 /*
 288  * Header of leaf directory nodes
 289  */
 290
 291 struct gfs2_leaf {
 292         struct gfs2_meta_header lf_header;
 293
 294         __be16 lf_depth;                /* Depth of leaf */
 295         __be16 lf_entries;              /* Number of dirents in leaf */
 296         __be32 lf_dirent_format;        /* Format of the dirents */
 297         __be64 lf_next;                 /* Next leaf, if overflow */
 298
 299         __u8 lf_reserved[64];
 300 };
 301
 302 /*
 303  * Extended attribute header format
 304  */
 305
 306 #define GFS2_EA_MAX_NAME_LEN    255
 307 #define GFS2_EA_MAX_DATA_LEN    65536
 308
 309 #define GFS2_EATYPE_UNUSED      0
 310 #define GFS2_EATYPE_USR         1
 311 #define GFS2_EATYPE_SYS         2
 312 #define GFS2_EATYPE_SECURITY    3
 313
 314 #define GFS2_EATYPE_LAST        3
 315 #define GFS2_EATYPE_VALID(x)    ((x) <= GFS2_EATYPE_LAST)
 316
 317 #define GFS2_EAFLAG_LAST        0x01    /* last ea in block */
 318
 319 struct gfs2_ea_header {
 320         __be32 ea_rec_len;
 321         __be32 ea_data_len;
 322         __u8 ea_name_len;       /* no NULL pointer after the string */
 323         __u8 ea_type;           /* GFS2_EATYPE_... */
 324         __u8 ea_flags;          /* GFS2_EAFLAG_... */
 325         __u8 ea_num_ptrs;
 326         __u32 __pad;
 327 };
 328
 329 /*
 330  * Log header structure
 331  */
 332
 333 #define GFS2_LOG_HEAD_UNMOUNT   0x00000001      /* log is clean */
 334
 335 struct gfs2_log_header {
 336         struct gfs2_meta_header lh_header;
 337
 338         __be64 lh_sequence;     /* Sequence number of this transaction */
 339         __be32 lh_flags;        /* GFS2_LOG_HEAD_... */
 340         __be32 lh_tail;         /* Block number of log tail */
 341         __be32 lh_blkno;
 342         __be32 lh_hash;
 343 };
 344
 345 /*
 346  * Log type descriptor
 347  */
 348
 349 #define GFS2_LOG_DESC_METADATA  300
 350 /* ld_data1 is the number of metadata blocks in the descriptor.
 351    ld_data2 is unused. */
 352
 353 #define GFS2_LOG_DESC_REVOKE    301
 354 /* ld_data1 is the number of revoke blocks in the descriptor.
 355    ld_data2 is unused. */
 356
 357 #define GFS2_LOG_DESC_JDATA     302
 358 /* ld_data1 is the number of data blocks in the descriptor.
 359    ld_data2 is unused. */
 360
 361 struct gfs2_log_descriptor {
 362         struct gfs2_meta_header ld_header;
 363
 364         __be32 ld_type;         /* GFS2_LOG_DESC_... */
 365         __be32 ld_length;       /* Number of buffers in this chunk */
 366         __be32 ld_data1;        /* descriptor-specific field */
 367         __be32 ld_data2;        /* descriptor-specific field */
 368
 369         __u8 ld_reserved[32];
 370 };
 371
 372 /*
 373  * Inum Range
 374  * Describe a range of formal inode numbers allocated to
 375  * one machine to assign to inodes.
 376  */
 377
 378 #define GFS2_INUM_QUANTUM       1048576
 379
 380 struct gfs2_inum_range {
 381         __be64 ir_start;
 382         __be64 ir_length;
 383 };
 384
 385 /*
 386  * Statfs change
 387  * Describes an change to the pool of free and allocated
 388  * blocks.
 389  */
 390
 391 struct gfs2_statfs_change {
 392         __be64 sc_total;
 393         __be64 sc_free;
 394         __be64 sc_dinodes;
 395 };
 396
 397 /*
 398  * Quota change
 399  * Describes an allocation change for a particular
 400  * user or group.
 401  */
 402
 403 #define GFS2_QCF_USER           0x00000001
 404
 405 struct gfs2_quota_change {
 406         __be64 qc_change;
 407         __be32 qc_flags;        /* GFS2_QCF_... */
 408         __be32 qc_id;
 409 };
 410
 411 #ifdef __KERNEL__
 412 /* Translation functions */
 413
 414 extern void gfs2_inum_in(struct gfs2_inum *no, char *buf);
 415 extern void gfs2_inum_out(const struct gfs2_inum *no, char *buf);
 416 extern void gfs2_sb_in(struct gfs2_sb *sb, char *buf);
 417 extern void gfs2_rindex_in(struct gfs2_rindex *ri, char *buf);
 418 extern void gfs2_rindex_out(struct gfs2_rindex *ri, char *buf);
 419 extern void gfs2_rgrp_in(struct gfs2_rgrp *rg, char *buf);
 420 extern void gfs2_rgrp_out(struct gfs2_rgrp *rg, char *buf);
 421 extern void gfs2_quota_in(struct gfs2_quota *qu, char *buf);
 422 extern void gfs2_quota_out(struct gfs2_quota *qu, char *buf);
 423 extern void gfs2_dinode_in(struct gfs2_dinode *di, char *buf);
 424 extern void gfs2_dinode_out(struct gfs2_dinode *di, 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_quota_change_in(struct gfs2_quota_change *qc, char *buf);
 433
 434 /* Printing functions */
 435
 436 extern void gfs2_rindex_print(struct gfs2_rindex *ri);
 437 extern void gfs2_dinode_print(struct gfs2_dinode *di);
 438
 439 #endif /* __KERNEL__ */
 440
 441 #endif /* __GFS2_ONDISK_DOT_H__ */