linux/include/linux/gfs2_ondisk.h
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   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
  56struct 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
  81struct 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
 112struct 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
 140struct 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
 173struct 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
 183struct 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
 199struct 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
 216enum {
 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
 249struct 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
 301struct 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
 314struct 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
 364struct 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
 380struct 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
 406struct 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
 425struct 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
 436struct 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
 450struct gfs2_quota_change {
 451        __be64 qc_change;
 452        __be32 qc_flags;        /* GFS2_QCF_... */
 453        __be32 qc_id;
 454};
 455
 456struct 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__ */
 465
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