include/uapi/linux/gfs2_ondisk.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  *
   6  * This copyrighted material is made available to anyone wishing to use,
   7  * modify, copy, or redistribute it subject to the terms and conditions
   8  * of the GNU General Public License v.2.
   9  */
  10
  11 #ifndef __GFS2_ONDISK_DOT_H__
  12 #define __GFS2_ONDISK_DOT_H__
  13
  14 #include <linux/types.h>
  15
  16 #define GFS2_MAGIC              0x01161970
  17 #define GFS2_BASIC_BLOCK        512
  18 #define GFS2_BASIC_BLOCK_SHIFT  9
  19
  20 /* Lock numbers of the LM_TYPE_NONDISK type */
  21
  22 #define GFS2_MOUNT_LOCK         0
  23 #define GFS2_LIVE_LOCK          1
  24 #define GFS2_FREEZE_LOCK        2
  25 #define GFS2_RENAME_LOCK        3
  26 #define GFS2_CONTROL_LOCK       4
  27 #define GFS2_MOUNTED_LOCK       5
  28
  29 /* Format numbers for various metadata types */
  30
  31 #define GFS2_FORMAT_NONE        0
  32 #define GFS2_FORMAT_SB          100
  33 #define GFS2_FORMAT_RG          200
  34 #define GFS2_FORMAT_RB          300
  35 #define GFS2_FORMAT_DI          400
  36 #define GFS2_FORMAT_IN          500
  37 #define GFS2_FORMAT_LF          600
  38 #define GFS2_FORMAT_JD          700
  39 #define GFS2_FORMAT_LH          800
  40 #define GFS2_FORMAT_LD          900
  41 #define GFS2_FORMAT_LB          1000
  42 #define GFS2_FORMAT_EA          1600
  43 #define GFS2_FORMAT_ED          1700
  44 #define GFS2_FORMAT_QC          1400
  45 /* These are format numbers for entities contained in files */
  46 #define GFS2_FORMAT_RI          1100
  47 #define GFS2_FORMAT_DE          1200
  48 #define GFS2_FORMAT_QU          1500
  49 /* These are part of the superblock */
  50 #define GFS2_FORMAT_FS          1801
  51 #define GFS2_FORMAT_MULTI       1900
  52
  53 /*
  54  * An on-disk inode number
  55  */
  56
  57 struct gfs2_inum {
  58         __be64 no_formal_ino;
  59         __be64 no_addr;
  60 };
  61
  62 /*
  63  * Generic metadata head structure
  64  * Every inplace buffer logged in the journal must start with this.
  65  */
  66
  67 #define GFS2_METATYPE_NONE      0
  68 #define GFS2_METATYPE_SB        1
  69 #define GFS2_METATYPE_RG        2
  70 #define GFS2_METATYPE_RB        3
  71 #define GFS2_METATYPE_DI        4
  72 #define GFS2_METATYPE_IN        5
  73 #define GFS2_METATYPE_LF        6
  74 #define GFS2_METATYPE_JD        7
  75 #define GFS2_METATYPE_LH        8
  76 #define GFS2_METATYPE_LD        9
  77 #define GFS2_METATYPE_LB        12
  78 #define GFS2_METATYPE_EA        10
  79 #define GFS2_METATYPE_ED        11
  80 #define GFS2_METATYPE_QC        14
  81
  82 struct gfs2_meta_header {
  83         __be32 mh_magic;
  84         __be32 mh_type;
  85         __be64 __pad0;          /* Was generation number in gfs1 */
  86         __be32 mh_format;
  87         /* This union is to keep userspace happy */
  88         union {
  89                 __be32 mh_jid;          /* Was incarnation number in gfs1 */
  90                 __be32 __pad1;
  91         };
  92 };
  93
  94 /*
  95  * super-block structure
  96  *
  97  * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
  98  *
  99  * Order is important, need to be able to read old superblocks to do on-disk
 100  * version upgrades.
 101  */
 102
 103 /* Address of superblock in GFS2 basic blocks */
 104 #define GFS2_SB_ADDR            128
 105
 106 /* The lock number for the superblock (must be zero) */
 107 #define GFS2_SB_LOCK            0
 108
 109 /* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
 110    Includes: the fencing zero at the end */
 111 #define GFS2_LOCKNAME_LEN       64
 112
 113 struct gfs2_sb {
 114         struct gfs2_meta_header sb_header;
 115
 116         __be32 sb_fs_format;
 117         __be32 sb_multihost_format;
 118         __u32  __pad0;  /* Was superblock flags in gfs1 */
 119
 120         __be32 sb_bsize;
 121         __be32 sb_bsize_shift;
 122         __u32 __pad1;   /* Was journal segment size in gfs1 */
 123
 124         struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
 125         struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
 126         struct gfs2_inum sb_root_dir;
 127
 128         char sb_lockproto[GFS2_LOCKNAME_LEN];
 129         char sb_locktable[GFS2_LOCKNAME_LEN];
 130
 131         struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
 132         struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
 133 #define GFS2_HAS_UUID 1
 134         __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */
 135 };
 136
 137 /*
 138  * resource index structure
 139  */
 140
 141 struct gfs2_rindex {
 142         __be64 ri_addr; /* grp block disk address */
 143         __be32 ri_length;       /* length of rgrp header in fs blocks */
 144         __u32 __pad;
 145
 146         __be64 ri_data0;        /* first data location */
 147         __be32 ri_data; /* num of data blocks in rgrp */
 148
 149         __be32 ri_bitbytes;     /* number of bytes in data bitmaps */
 150
 151         __u8 ri_reserved[64];
 152 };
 153
 154 /*
 155  * resource group header structure
 156  */
 157
 158 /* Number of blocks per byte in rgrp */
 159 #define GFS2_NBBY               4
 160 #define GFS2_BIT_SIZE           2
 161 #define GFS2_BIT_MASK           0x00000003
 162
 163 #define GFS2_BLKST_FREE         0
 164 #define GFS2_BLKST_USED         1
 165 #define GFS2_BLKST_UNLINKED     2
 166 #define GFS2_BLKST_DINODE       3
 167
 168 #define GFS2_RGF_JOURNAL        0x00000001
 169 #define GFS2_RGF_METAONLY       0x00000002
 170 #define GFS2_RGF_DATAONLY       0x00000004
 171 #define GFS2_RGF_NOALLOC        0x00000008
 172 #define GFS2_RGF_TRIMMED        0x00000010
 173
 174 struct gfs2_rgrp_lvb {
 175         __be32 rl_magic;
 176         __be32 rl_flags;
 177         __be32 rl_free;
 178         __be32 rl_dinodes;
 179         __be64 rl_igeneration;
 180         __be32 rl_unlinked;
 181         __be32 __pad;
 182 };
 183
 184 struct gfs2_rgrp {
 185         struct gfs2_meta_header rg_header;
 186
 187         __be32 rg_flags;
 188         __be32 rg_free;
 189         __be32 rg_dinodes;
 190         __be32 __pad;
 191         __be64 rg_igeneration;
 192
 193         __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */
 194 };
 195
 196 /*
 197  * quota structure
 198  */
 199
 200 struct gfs2_quota {
 201         __be64 qu_limit;
 202         __be64 qu_warn;
 203         __be64 qu_value;
 204         __u8 qu_reserved[64];
 205 };
 206
 207 /*
 208  * dinode structure
 209  */
 210
 211 #define GFS2_MAX_META_HEIGHT    10
 212 #define GFS2_DIR_MAX_DEPTH      17
 213
 214 #define DT2IF(dt) (((dt) << 12) & S_IFMT)
 215 #define IF2DT(sif) (((sif) & S_IFMT) >> 12)
 216
 217 enum {
 218         gfs2fl_Jdata            = 0,
 219         gfs2fl_ExHash           = 1,
 220         gfs2fl_Unused           = 2,
 221         gfs2fl_EaIndirect       = 3,
 222         gfs2fl_Directio         = 4,
 223         gfs2fl_Immutable        = 5,
 224         gfs2fl_AppendOnly       = 6,
 225         gfs2fl_NoAtime          = 7,
 226         gfs2fl_Sync             = 8,
 227         gfs2fl_System           = 9,
 228         gfs2fl_TopLevel         = 10,
 229         gfs2fl_TruncInProg      = 29,
 230         gfs2fl_InheritDirectio  = 30,
 231         gfs2fl_InheritJdata     = 31,
 232 };
 233
 234 /* Dinode flags */
 235 #define GFS2_DIF_JDATA                  0x00000001
 236 #define GFS2_DIF_EXHASH                 0x00000002
 237 #define GFS2_DIF_UNUSED                 0x00000004  /* only in gfs1 */
 238 #define GFS2_DIF_EA_INDIRECT            0x00000008
 239 #define GFS2_DIF_DIRECTIO               0x00000010
 240 #define GFS2_DIF_IMMUTABLE              0x00000020
 241 #define GFS2_DIF_APPENDONLY             0x00000040
 242 #define GFS2_DIF_NOATIME                0x00000080
 243 #define GFS2_DIF_SYNC                   0x00000100
 244 #define GFS2_DIF_SYSTEM                 0x00000200 /* New in gfs2 */
 245 #define GFS2_DIF_TOPDIR                 0x00000400 /* New in gfs2 */
 246 #define GFS2_DIF_TRUNC_IN_PROG          0x20000000 /* New in gfs2 */
 247 #define GFS2_DIF_INHERIT_DIRECTIO       0x40000000 /* only in gfs1 */
 248 #define GFS2_DIF_INHERIT_JDATA          0x80000000
 249
 250 struct gfs2_dinode {
 251         struct gfs2_meta_header di_header;
 252
 253         struct gfs2_inum di_num;
 254
 255         __be32 di_mode; /* mode of file */
 256         __be32 di_uid;  /* owner's user id */
 257         __be32 di_gid;  /* owner's group id */
 258         __be32 di_nlink;        /* number of links to this file */
 259         __be64 di_size; /* number of bytes in file */
 260         __be64 di_blocks;       /* number of blocks in file */
 261         __be64 di_atime;        /* time last accessed */
 262         __be64 di_mtime;        /* time last modified */
 263         __be64 di_ctime;        /* time last changed */
 264         __be32 di_major;        /* device major number */
 265         __be32 di_minor;        /* device minor number */
 266
 267         /* This section varies from gfs1. Padding added to align with
 268          * remainder of dinode
 269          */
 270         __be64 di_goal_meta;    /* rgrp to alloc from next */
 271         __be64 di_goal_data;    /* data block goal */
 272         __be64 di_generation;   /* generation number for NFS */
 273
 274         __be32 di_flags;        /* GFS2_DIF_... */
 275         __be32 di_payload_format;  /* GFS2_FORMAT_... */
 276         __u16 __pad1;   /* Was ditype in gfs1 */
 277         __be16 di_height;       /* height of metadata */
 278         __u32 __pad2;   /* Unused incarnation number from gfs1 */
 279
 280         /* These only apply to directories  */
 281         __u16 __pad3;   /* Padding */
 282         __be16 di_depth;        /* Number of bits in the table */
 283         __be32 di_entries;      /* The number of entries in the directory */
 284
 285         struct gfs2_inum __pad4; /* Unused even in current gfs1 */
 286
 287         __be64 di_eattr;        /* extended attribute block number */
 288         __be32 di_atime_nsec;   /* nsec portion of atime */
 289         __be32 di_mtime_nsec;   /* nsec portion of mtime */
 290         __be32 di_ctime_nsec;   /* nsec portion of ctime */
 291
 292         __u8 di_reserved[44];
 293 };
 294
 295 /*
 296  * directory structure - many of these per directory file
 297  */
 298
 299 #define GFS2_FNAMESIZE          255
 300 #define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
 301 #define GFS2_MIN_DIRENT_SIZE (GFS2_DIRENT_SIZE(1))
 302
 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         __be16 de_rahead;
 311         union {
 312                 __u8 __pad[12];
 313                 struct {
 314                         __u32 de_cookie; /* ondisk value not used */
 315                         __u8 pad3[8];
 316                 };
 317         };
 318 };
 319
 320 /*
 321  * Header of leaf directory nodes
 322  */
 323
 324 struct gfs2_leaf {
 325         struct gfs2_meta_header lf_header;
 326
 327         __be16 lf_depth;                /* Depth of leaf */
 328         __be16 lf_entries;              /* Number of dirents in leaf */
 329         __be32 lf_dirent_format;        /* Format of the dirents */
 330         __be64 lf_next;                 /* Next leaf, if overflow */
 331
 332         union {
 333                 __u8 lf_reserved[64];
 334                 struct {
 335                         __be64 lf_inode;        /* Dir inode number */
 336                         __be32 lf_dist;         /* Dist from inode on chain */
 337                         __be32 lf_nsec;         /* Last ins/del usecs */
 338                         __be64 lf_sec;          /* Last ins/del in secs */
 339                         __u8 lf_reserved2[40];
 340                 };
 341         };
 342 };
 343
 344 /*
 345  * Extended attribute header format
 346  *
 347  * This works in a similar way to dirents. There is a fixed size header
 348  * followed by a variable length section made up of the name and the
 349  * associated data. In the case of a "stuffed" entry, the value is
 350  * inline directly after the name, the ea_num_ptrs entry will be
 351  * zero in that case. For non-"stuffed" entries, there will be
 352  * a set of pointers (aligned to 8 byte boundary) to the block(s)
 353  * containing the value.
 354  *
 355  * The blocks containing the values and the blocks containing the
 356  * extended attribute headers themselves all start with the common
 357  * metadata header. Each inode, if it has extended attributes, will
 358  * have either a single block containing the extended attribute headers
 359  * or a single indirect block pointing to blocks containing the
 360  * extended attribute headers.
 361  *
 362  * The maximum size of the data part of an extended attribute is 64k
 363  * so the number of blocks required depends upon block size. Since the
 364  * block size also determines the number of pointers in an indirect
 365  * block, its a fairly complicated calculation to work out the maximum
 366  * number of blocks that an inode may have relating to extended attributes.
 367  *
 368  */
 369
 370 #define GFS2_EA_MAX_NAME_LEN    255
 371 #define GFS2_EA_MAX_DATA_LEN    65536
 372
 373 #define GFS2_EATYPE_UNUSED      0
 374 #define GFS2_EATYPE_USR         1
 375 #define GFS2_EATYPE_SYS         2
 376 #define GFS2_EATYPE_SECURITY    3
 377
 378 #define GFS2_EATYPE_LAST        3
 379 #define GFS2_EATYPE_VALID(x)    ((x) <= GFS2_EATYPE_LAST)
 380
 381 #define GFS2_EAFLAG_LAST        0x01    /* last ea in block */
 382
 383 struct gfs2_ea_header {
 384         __be32 ea_rec_len;
 385         __be32 ea_data_len;
 386         __u8 ea_name_len;       /* no NULL pointer after the string */
 387         __u8 ea_type;           /* GFS2_EATYPE_... */
 388         __u8 ea_flags;          /* GFS2_EAFLAG_... */
 389         __u8 ea_num_ptrs;
 390         __u32 __pad;
 391 };
 392
 393 /*
 394  * Log header structure
 395  */
 396
 397 #define GFS2_LOG_HEAD_UNMOUNT   0x00000001      /* log is clean */
 398
 399 struct gfs2_log_header {
 400         struct gfs2_meta_header lh_header;
 401
 402         __be64 lh_sequence;     /* Sequence number of this transaction */
 403         __be32 lh_flags;        /* GFS2_LOG_HEAD_... */
 404         __be32 lh_tail;         /* Block number of log tail */
 405         __be32 lh_blkno;
 406         __be32 lh_hash;
 407 };
 408
 409 /*
 410  * Log type descriptor
 411  */
 412
 413 #define GFS2_LOG_DESC_METADATA  300
 414 /* ld_data1 is the number of metadata blocks in the descriptor.
 415    ld_data2 is unused. */
 416
 417 #define GFS2_LOG_DESC_REVOKE    301
 418 /* ld_data1 is the number of revoke blocks in the descriptor.
 419    ld_data2 is unused. */
 420
 421 #define GFS2_LOG_DESC_JDATA     302
 422 /* ld_data1 is the number of data blocks in the descriptor.
 423    ld_data2 is unused. */
 424
 425 struct gfs2_log_descriptor {
 426         struct gfs2_meta_header ld_header;
 427
 428         __be32 ld_type;         /* GFS2_LOG_DESC_... */
 429         __be32 ld_length;       /* Number of buffers in this chunk */
 430         __be32 ld_data1;        /* descriptor-specific field */
 431         __be32 ld_data2;        /* descriptor-specific field */
 432
 433         __u8 ld_reserved[32];
 434 };
 435
 436 /*
 437  * Inum Range
 438  * Describe a range of formal inode numbers allocated to
 439  * one machine to assign to inodes.
 440  */
 441
 442 #define GFS2_INUM_QUANTUM       1048576
 443
 444 struct gfs2_inum_range {
 445         __be64 ir_start;
 446         __be64 ir_length;
 447 };
 448
 449 /*
 450  * Statfs change
 451  * Describes an change to the pool of free and allocated
 452  * blocks.
 453  */
 454
 455 struct gfs2_statfs_change {
 456         __be64 sc_total;
 457         __be64 sc_free;
 458         __be64 sc_dinodes;
 459 };
 460
 461 /*
 462  * Quota change
 463  * Describes an allocation change for a particular
 464  * user or group.
 465  */
 466
 467 #define GFS2_QCF_USER           0x00000001
 468
 469 struct gfs2_quota_change {
 470         __be64 qc_change;
 471         __be32 qc_flags;        /* GFS2_QCF_... */
 472         __be32 qc_id;
 473 };
 474
 475 struct gfs2_quota_lvb {
 476         __be32 qb_magic;
 477         __u32 __pad;
 478         __be64 qb_limit;      /* Hard limit of # blocks to alloc */
 479         __be64 qb_warn;       /* Warn user when alloc is above this # */
 480         __be64 qb_value;       /* Current # blocks allocated */
 481 };
 482
 483 #endif /* __GFS2_ONDISK_DOT_H__ */