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 /*
  58  * Generic metadata head structure
  59  * Every inplace buffer logged in the journal must start with this.
  60  */
  61
  62 #define GFS2_METATYPE_NONE      0
  63 #define GFS2_METATYPE_SB        1
  64 #define GFS2_METATYPE_RG        2
  65 #define GFS2_METATYPE_RB        3
  66 #define GFS2_METATYPE_DI        4
  67 #define GFS2_METATYPE_IN        5
  68 #define GFS2_METATYPE_LF        6
  69 #define GFS2_METATYPE_JD        7
  70 #define GFS2_METATYPE_LH        8
  71 #define GFS2_METATYPE_LD        9
  72 #define GFS2_METATYPE_LB        12
  73 #define GFS2_METATYPE_EA        10
  74 #define GFS2_METATYPE_ED        11
  75 #define GFS2_METATYPE_QC        14
  76
  77 struct gfs2_meta_header {
  78         __be32 mh_magic;
  79         __be32 mh_type;
  80         __be64 __pad0;          /* Was generation number in gfs1 */
  81         __be32 mh_format;
  82         __be32 __pad1;          /* Was incarnation number in gfs1 */
  83 };
  84
  85 /*
  86  * super-block structure
  87  *
  88  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
  89  *
  90  * Order is important, need to be able to read old superblocks to do on-disk
  91  * version upgrades.
  92  */
  93
  94 /* Address of superblock in GFS2 basic blocks */
  95 #define GFS2_SB_ADDR            128
  96
  97 /* The lock number for the superblock (must be zero) */
  98 #define GFS2_SB_LOCK            0
  99
 100 /* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
 101    Includes: the fencing zero at the end */
 102 #define GFS2_LOCKNAME_LEN       64
 103
 104 struct gfs2_sb {
 105         struct gfs2_meta_header sb_header;
 106
 107         __be32 sb_fs_format;
 108         __be32 sb_multihost_format;
 109         __u32  __pad0;  /* Was superblock flags in gfs1 */
 110
 111         __be32 sb_bsize;
 112         __be32 sb_bsize_shift;
 113         __u32 __pad1;   /* Was journal segment size in gfs1 */
 114
 115         struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 116         struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 117         struct gfs2_inum sb_root_dir;
 118
 119         char sb_lockproto[GFS2_LOCKNAME_LEN];
 120         char sb_locktable[GFS2_LOCKNAME_LEN];
 121         /* In gfs1, quota and license dinodes followed */
 122 };
 123
 124 /*
 125  * resource index structure
 126  */
 127
 128 struct gfs2_rindex {
 129         __be64 ri_addr; /* grp block disk address */
 130         __be32 ri_length;       /* length of rgrp header in fs blocks */
 131         __u32 __pad;
 132
 133         __be64 ri_data0;        /* first data location */
 134         __be32 ri_data; /* num of data blocks in rgrp */
 135
 136         __be32 ri_bitbytes;     /* number of bytes in data bitmaps */
 137
 138         __u8 ri_reserved[64];
 139 };
 140
 141 /*
 142  * resource group header structure
 143  */
 144
 145 /* Number of blocks per byte in rgrp */
 146 #define GFS2_NBBY               4
 147 #define GFS2_BIT_SIZE           2
 148 #define GFS2_BIT_MASK           0x00000003
 149
 150 #define GFS2_BLKST_FREE         0
 151 #define GFS2_BLKST_USED         1
 152 #define GFS2_BLKST_UNLINKED     2
 153 #define GFS2_BLKST_DINODE       3
 154
 155 #define GFS2_RGF_JOURNAL        0x00000001
 156 #define GFS2_RGF_METAONLY       0x00000002
 157 #define GFS2_RGF_DATAONLY       0x00000004
 158 #define GFS2_RGF_NOALLOC        0x00000008
 159
 160 struct gfs2_rgrp {
 161         struct gfs2_meta_header rg_header;
 162
 163         __be32 rg_flags;
 164         __be32 rg_free;
 165         __be32 rg_dinodes;
 166         __be32 __pad;
 167         __be64 rg_igeneration;
 168
 169         __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
 170 };
 171
 172 /*
 173  * quota linked list: user quotas and group quotas form two separate
 174  * singly linked lists. ll_next stores uids or gids of next quotas in the
 175  * linked list.
 176
 177 Given the uid/gid, how to calculate the quota file offsets for the corresponding
 178 gfs2_quota structures on disk:
 179
 180 for user quotas, given uid,
 181 offset = uid * sizeof(struct gfs2_quota);
 182
 183 for group quotas, given gid,
 184 offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
 185
 186
 187   uid:0   gid:0       uid:12   gid:12      uid:17   gid:17     uid:5142 gid:5142
 188 +-------+-------+    +-------+-------+    +-------+- - - -+    +- - - -+-------+
 189 | valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid |
 190 +-------+-------+    +-------+-------+    +-------+- - - -+    +- - - -+-------+
 191 next:12   next:12    next:17 next:5142    next:NULL                    next:NULL
 192     |       |            |       |            |<-- user quota list         |
 193      \______|___________/ \______|___________/         group quota list -->|
 194             |                    |                                         |
 195              \__________________/ \_______________________________________/
 196
 197 */
 198
 199 /*
 200  * quota structure
 201  */
 202
 203 struct gfs2_quota {
 204         __be64 qu_limit;
 205         __be64 qu_warn;
 206         __be64 qu_value;
 207         __be32 qu_ll_next; /* location of next quota in list */
 208         __u8 qu_reserved[60];
 209 };
 210
 211 /*
 212  * dinode structure
 213  */
 214
 215 #define GFS2_MAX_META_HEIGHT    10
 216 #define GFS2_DIR_MAX_DEPTH      17
 217
 218 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
 219 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
 220
 221 enum {
 222         gfs2fl_Jdata            = 0,
 223         gfs2fl_ExHash           = 1,
 224         gfs2fl_Unused           = 2,
 225         gfs2fl_EaIndirect       = 3,
 226         gfs2fl_Directio         = 4,
 227         gfs2fl_Immutable        = 5,
 228         gfs2fl_AppendOnly       = 6,
 229         gfs2fl_NoAtime          = 7,
 230         gfs2fl_Sync             = 8,
 231         gfs2fl_System           = 9,
 232         gfs2fl_TruncInProg      = 29,
 233         gfs2fl_InheritDirectio  = 30,
 234         gfs2fl_InheritJdata     = 31,
 235 };
 236
 237 /* Dinode flags */
 238 #define GFS2_DIF_JDATA                  0x00000001
 239 #define GFS2_DIF_EXHASH                 0x00000002
 240 #define GFS2_DIF_UNUSED                 0x00000004  /* only in gfs1 */
 241 #define GFS2_DIF_EA_INDIRECT            0x00000008
 242 #define GFS2_DIF_DIRECTIO               0x00000010
 243 #define GFS2_DIF_IMMUTABLE              0x00000020
 244 #define GFS2_DIF_APPENDONLY             0x00000040
 245 #define GFS2_DIF_NOATIME                0x00000080
 246 #define GFS2_DIF_SYNC                   0x00000100
 247 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
 248 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
 249 #define GFS2_DIF_INHERIT_DIRECTIO       0x40000000
 250 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 251
 252 struct gfs2_dinode {
 253         struct gfs2_meta_header di_header;
 254
 255         struct gfs2_inum di_num;
 256
 257         __be32 di_mode; /* mode of file */
 258         __be32 di_uid;  /* owner's user id */
 259         __be32 di_gid;  /* owner's group id */
 260         __be32 di_nlink;        /* number of links to this file */
 261         __be64 di_size; /* number of bytes in file */
 262         __be64 di_blocks;       /* number of blocks in file */
 263         __be64 di_atime;        /* time last accessed */
 264         __be64 di_mtime;        /* time last modified */
 265         __be64 di_ctime;        /* time last changed */
 266         __be32 di_major;        /* device major number */
 267         __be32 di_minor;        /* device minor number */
 268
 269         /* This section varies from gfs1. Padding added to align with
 270          * remainder of dinode
 271          */
 272         __be64 di_goal_meta;    /* rgrp to alloc from next */
 273         __be64 di_goal_data;    /* data block goal */
 274         __be64 di_generation;   /* generation number for NFS */
 275
 276         __be32 di_flags;        /* GFS2_DIF_... */
 277         __be32 di_payload_format;  /* GFS2_FORMAT_... */
 278         __u16 __pad1;   /* Was ditype in gfs1 */
 279         __be16 di_height;       /* height of metadata */
 280         __u32 __pad2;   /* Unused incarnation number from gfs1 */
 281
 282         /* These only apply to directories  */
 283         __u16 __pad3;   /* Padding */
 284         __be16 di_depth;        /* Number of bits in the table */
 285         __be32 di_entries;      /* The number of entries in the directory */
 286
 287         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 288
 289         __be64 di_eattr;        /* extended attribute block number */
 290         __be32 di_atime_nsec;   /* nsec portion of atime */
 291         __be32 di_mtime_nsec;   /* nsec portion of mtime */
 292         __be32 di_ctime_nsec;   /* nsec portion of ctime */
 293
 294         __u8 di_reserved[44];
 295 };
 296
 297 /*
 298  * directory structure - many of these per directory file
 299  */
 300
 301 #define GFS2_FNAMESIZE          255
 302 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
 303
 304 struct gfs2_dirent {
 305         struct gfs2_inum de_inum;
 306         __be32 de_hash;
 307         __be16 de_rec_len;
 308         __be16 de_name_len;
 309         __be16 de_type;
 310         __u8 __pad[14];
 311 };
 312
 313 /*
 314  * Header of leaf directory nodes
 315  */
 316
 317 struct gfs2_leaf {
 318         struct gfs2_meta_header lf_header;
 319
 320         __be16 lf_depth;                /* Depth of leaf */
 321         __be16 lf_entries;              /* Number of dirents in leaf */
 322         __be32 lf_dirent_format;        /* Format of the dirents */
 323         __be64 lf_next;                 /* Next leaf, if overflow */
 324
 325         __u8 lf_reserved[64];
 326 };
 327
 328 /*
 329  * Extended attribute header format
 330  */
 331
 332 #define GFS2_EA_MAX_NAME_LEN    255
 333 #define GFS2_EA_MAX_DATA_LEN    65536
 334
 335 #define GFS2_EATYPE_UNUSED      0
 336 #define GFS2_EATYPE_USR         1
 337 #define GFS2_EATYPE_SYS         2
 338 #define GFS2_EATYPE_SECURITY    3
 339
 340 #define GFS2_EATYPE_LAST        3
 341 #define GFS2_EATYPE_VALID(x)    ((x) <= GFS2_EATYPE_LAST)
 342
 343 #define GFS2_EAFLAG_LAST        0x01    /* last ea in block */
 344
 345 struct gfs2_ea_header {
 346         __be32 ea_rec_len;
 347         __be32 ea_data_len;
 348         __u8 ea_name_len;       /* no NULL pointer after the string */
 349         __u8 ea_type;           /* GFS2_EATYPE_... */
 350         __u8 ea_flags;          /* GFS2_EAFLAG_... */
 351         __u8 ea_num_ptrs;
 352         __u32 __pad;
 353 };
 354
 355 /*
 356  * Log header structure
 357  */
 358
 359 #define GFS2_LOG_HEAD_UNMOUNT   0x00000001      /* log is clean */
 360
 361 struct gfs2_log_header {
 362         struct gfs2_meta_header lh_header;
 363
 364         __be64 lh_sequence;     /* Sequence number of this transaction */
 365         __be32 lh_flags;        /* GFS2_LOG_HEAD_... */
 366         __be32 lh_tail;         /* Block number of log tail */
 367         __be32 lh_blkno;
 368         __be32 lh_hash;
 369 };
 370
 371 /*
 372  * Log type descriptor
 373  */
 374
 375 #define GFS2_LOG_DESC_METADATA  300
 376 /* ld_data1 is the number of metadata blocks in the descriptor.
 377    ld_data2 is unused. */
 378
 379 #define GFS2_LOG_DESC_REVOKE    301
 380 /* ld_data1 is the number of revoke blocks in the descriptor.
 381    ld_data2 is unused. */
 382
 383 #define GFS2_LOG_DESC_JDATA     302
 384 /* ld_data1 is the number of data blocks in the descriptor.
 385    ld_data2 is unused. */
 386
 387 struct gfs2_log_descriptor {
 388         struct gfs2_meta_header ld_header;
 389
 390         __be32 ld_type;         /* GFS2_LOG_DESC_... */
 391         __be32 ld_length;       /* Number of buffers in this chunk */
 392         __be32 ld_data1;        /* descriptor-specific field */
 393         __be32 ld_data2;        /* descriptor-specific field */
 394
 395         __u8 ld_reserved[32];
 396 };
 397
 398 /*
 399  * Inum Range
 400  * Describe a range of formal inode numbers allocated to
 401  * one machine to assign to inodes.
 402  */
 403
 404 #define GFS2_INUM_QUANTUM       1048576
 405
 406 struct gfs2_inum_range {
 407         __be64 ir_start;
 408         __be64 ir_length;
 409 };
 410
 411 /*
 412  * Statfs change
 413  * Describes an change to the pool of free and allocated
 414  * blocks.
 415  */
 416
 417 struct gfs2_statfs_change {
 418         __be64 sc_total;
 419         __be64 sc_free;
 420         __be64 sc_dinodes;
 421 };
 422
 423 /*
 424  * Quota change
 425  * Describes an allocation change for a particular
 426  * user or group.
 427  */
 428
 429 #define GFS2_QCF_USER           0x00000001
 430
 431 struct gfs2_quota_change {
 432         __be64 qc_change;
 433         __be32 qc_flags;        /* GFS2_QCF_... */
 434         __be32 qc_id;
 435 };
 436
 437 struct gfs2_quota_lvb {
 438         __be32 qb_magic;
 439         __u32 __pad;
 440         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 441         __be64 qb_warn;       /* Warn user when alloc is above this # */
 442         __be64 qb_value;       /* Current # blocks allocated */
 443 };
 444
 445 #endif /* __GFS2_ONDISK_DOT_H__ */