fs/xfs/libxfs/xfs_format.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_FORMAT_H__
  19 #define __XFS_FORMAT_H__
  20
  21 /*
  22  * XFS On Disk Format Definitions
  23  *
  24  * This header file defines all the on-disk format definitions for
  25  * general XFS objects. Directory and attribute related objects are defined in
  26  * xfs_da_format.h, which log and log item formats are defined in
  27  * xfs_log_format.h. Everything else goes here.
  28  */
  29
  30 struct xfs_mount;
  31 struct xfs_trans;
  32 struct xfs_inode;
  33 struct xfs_buf;
  34 struct xfs_ifork;
  35
  36 /*
  37  * Super block
  38  * Fits into a sector-sized buffer at address 0 of each allocation group.
  39  * Only the first of these is ever updated except during growfs.
  40  */
  41 #define XFS_SB_MAGIC            0x58465342      /* 'XFSB' */
  42 #define XFS_SB_VERSION_1        1               /* 5.3, 6.0.1, 6.1 */
  43 #define XFS_SB_VERSION_2        2               /* 6.2 - attributes */
  44 #define XFS_SB_VERSION_3        3               /* 6.2 - new inode version */
  45 #define XFS_SB_VERSION_4        4               /* 6.2+ - bitmask version */
  46 #define XFS_SB_VERSION_5        5               /* CRC enabled filesystem */
  47 #define XFS_SB_VERSION_NUMBITS          0x000f
  48 #define XFS_SB_VERSION_ALLFBITS         0xfff0
  49 #define XFS_SB_VERSION_ATTRBIT          0x0010
  50 #define XFS_SB_VERSION_NLINKBIT         0x0020
  51 #define XFS_SB_VERSION_QUOTABIT         0x0040
  52 #define XFS_SB_VERSION_ALIGNBIT         0x0080
  53 #define XFS_SB_VERSION_DALIGNBIT        0x0100
  54 #define XFS_SB_VERSION_SHAREDBIT        0x0200
  55 #define XFS_SB_VERSION_LOGV2BIT         0x0400
  56 #define XFS_SB_VERSION_SECTORBIT        0x0800
  57 #define XFS_SB_VERSION_EXTFLGBIT        0x1000
  58 #define XFS_SB_VERSION_DIRV2BIT         0x2000
  59 #define XFS_SB_VERSION_BORGBIT          0x4000  /* ASCII only case-insens. */
  60 #define XFS_SB_VERSION_MOREBITSBIT      0x8000
  61
  62 /*
  63  * The size of a single extended attribute on disk is limited by
  64  * the size of index values within the attribute entries themselves.
  65  * These are be16 fields, so we can only support attribute data
  66  * sizes up to 2^16 bytes in length.
  67  */
  68 #define XFS_XATTR_SIZE_MAX (1 << 16)
  69
  70 /*
  71  * Supported feature bit list is just all bits in the versionnum field because
  72  * we've used them all up and understand them all. Except, of course, for the
  73  * shared superblock bit, which nobody knows what it does and so is unsupported.
  74  */
  75 #define XFS_SB_VERSION_OKBITS           \
  76         ((XFS_SB_VERSION_NUMBITS | XFS_SB_VERSION_ALLFBITS) & \
  77                 ~XFS_SB_VERSION_SHAREDBIT)
  78
  79 /*
  80  * There are two words to hold XFS "feature" bits: the original
  81  * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
  82  * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
  83  *
  84  * These defines represent bits in sb_features2.
  85  */
  86 #define XFS_SB_VERSION2_RESERVED1BIT    0x00000001
  87 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002      /* Superblk counters */
  88 #define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
  89 #define XFS_SB_VERSION2_ATTR2BIT        0x00000008      /* Inline attr rework */
  90 #define XFS_SB_VERSION2_PARENTBIT       0x00000010      /* parent pointers */
  91 #define XFS_SB_VERSION2_PROJID32BIT     0x00000080      /* 32 bit project id */
  92 #define XFS_SB_VERSION2_CRCBIT          0x00000100      /* metadata CRCs */
  93 #define XFS_SB_VERSION2_FTYPE           0x00000200      /* inode type in dir */
  94
  95 #define XFS_SB_VERSION2_OKBITS          \
  96         (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
  97          XFS_SB_VERSION2_ATTR2BIT       | \
  98          XFS_SB_VERSION2_PROJID32BIT    | \
  99          XFS_SB_VERSION2_FTYPE)
 100
 101 /*
 102  * Superblock - in core version.  Must match the ondisk version below.
 103  * Must be padded to 64 bit alignment.
 104  */
 105 typedef struct xfs_sb {
 106         __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 107         __uint32_t      sb_blocksize;   /* logical block size, bytes */
 108         xfs_rfsblock_t  sb_dblocks;     /* number of data blocks */
 109         xfs_rfsblock_t  sb_rblocks;     /* number of realtime blocks */
 110         xfs_rtblock_t   sb_rextents;    /* number of realtime extents */
 111         uuid_t          sb_uuid;        /* user-visible file system unique id */
 112         xfs_fsblock_t   sb_logstart;    /* starting block of log if internal */
 113         xfs_ino_t       sb_rootino;     /* root inode number */
 114         xfs_ino_t       sb_rbmino;      /* bitmap inode for realtime extents */
 115         xfs_ino_t       sb_rsumino;     /* summary inode for rt bitmap */
 116         xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
 117         xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
 118         xfs_agnumber_t  sb_agcount;     /* number of allocation groups */
 119         xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
 120         xfs_extlen_t    sb_logblocks;   /* number of log blocks */
 121         __uint16_t      sb_versionnum;  /* header version == XFS_SB_VERSION */
 122         __uint16_t      sb_sectsize;    /* volume sector size, bytes */
 123         __uint16_t      sb_inodesize;   /* inode size, bytes */
 124         __uint16_t      sb_inopblock;   /* inodes per block */
 125         char            sb_fname[12];   /* file system name */
 126         __uint8_t       sb_blocklog;    /* log2 of sb_blocksize */
 127         __uint8_t       sb_sectlog;     /* log2 of sb_sectsize */
 128         __uint8_t       sb_inodelog;    /* log2 of sb_inodesize */
 129         __uint8_t       sb_inopblog;    /* log2 of sb_inopblock */
 130         __uint8_t       sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 131         __uint8_t       sb_rextslog;    /* log2 of sb_rextents */
 132         __uint8_t       sb_inprogress;  /* mkfs is in progress, don't mount */
 133         __uint8_t       sb_imax_pct;    /* max % of fs for inode space */
 134                                         /* statistics */
 135         /*
 136          * These fields must remain contiguous.  If you really
 137          * want to change their layout, make sure you fix the
 138          * code in xfs_trans_apply_sb_deltas().
 139          */
 140         __uint64_t      sb_icount;      /* allocated inodes */
 141         __uint64_t      sb_ifree;       /* free inodes */
 142         __uint64_t      sb_fdblocks;    /* free data blocks */
 143         __uint64_t      sb_frextents;   /* free realtime extents */
 144         /*
 145          * End contiguous fields.
 146          */
 147         xfs_ino_t       sb_uquotino;    /* user quota inode */
 148         xfs_ino_t       sb_gquotino;    /* group quota inode */
 149         __uint16_t      sb_qflags;      /* quota flags */
 150         __uint8_t       sb_flags;       /* misc. flags */
 151         __uint8_t       sb_shared_vn;   /* shared version number */
 152         xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 153         __uint32_t      sb_unit;        /* stripe or raid unit */
 154         __uint32_t      sb_width;       /* stripe or raid width */
 155         __uint8_t       sb_dirblklog;   /* log2 of dir block size (fsbs) */
 156         __uint8_t       sb_logsectlog;  /* log2 of the log sector size */
 157         __uint16_t      sb_logsectsize; /* sector size for the log, bytes */
 158         __uint32_t      sb_logsunit;    /* stripe unit size for the log */
 159         __uint32_t      sb_features2;   /* additional feature bits */
 160
 161         /*
 162          * bad features2 field as a result of failing to pad the sb structure to
 163          * 64 bits. Some machines will be using this field for features2 bits.
 164          * Easiest just to mark it bad and not use it for anything else.
 165          *
 166          * This is not kept up to date in memory; it is always overwritten by
 167          * the value in sb_features2 when formatting the incore superblock to
 168          * the disk buffer.
 169          */
 170         __uint32_t      sb_bad_features2;
 171
 172         /* version 5 superblock fields start here */
 173
 174         /* feature masks */
 175         __uint32_t      sb_features_compat;
 176         __uint32_t      sb_features_ro_compat;
 177         __uint32_t      sb_features_incompat;
 178         __uint32_t      sb_features_log_incompat;
 179
 180         __uint32_t      sb_crc;         /* superblock crc */
 181         xfs_extlen_t    sb_spino_align; /* sparse inode chunk alignment */
 182
 183         xfs_ino_t       sb_pquotino;    /* project quota inode */
 184         xfs_lsn_t       sb_lsn;         /* last write sequence */
 185         uuid_t          sb_meta_uuid;   /* metadata file system unique id */
 186
 187         /* must be padded to 64 bit alignment */
 188 } xfs_sb_t;
 189
 190 #define XFS_SB_CRC_OFF          offsetof(struct xfs_sb, sb_crc)
 191
 192 /*
 193  * Superblock - on disk version.  Must match the in core version above.
 194  * Must be padded to 64 bit alignment.
 195  */
 196 typedef struct xfs_dsb {
 197         __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 198         __be32          sb_blocksize;   /* logical block size, bytes */
 199         __be64          sb_dblocks;     /* number of data blocks */
 200         __be64          sb_rblocks;     /* number of realtime blocks */
 201         __be64          sb_rextents;    /* number of realtime extents */
 202         uuid_t          sb_uuid;        /* user-visible file system unique id */
 203         __be64          sb_logstart;    /* starting block of log if internal */
 204         __be64          sb_rootino;     /* root inode number */
 205         __be64          sb_rbmino;      /* bitmap inode for realtime extents */
 206         __be64          sb_rsumino;     /* summary inode for rt bitmap */
 207         __be32          sb_rextsize;    /* realtime extent size, blocks */
 208         __be32          sb_agblocks;    /* size of an allocation group */
 209         __be32          sb_agcount;     /* number of allocation groups */
 210         __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
 211         __be32          sb_logblocks;   /* number of log blocks */
 212         __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
 213         __be16          sb_sectsize;    /* volume sector size, bytes */
 214         __be16          sb_inodesize;   /* inode size, bytes */
 215         __be16          sb_inopblock;   /* inodes per block */
 216         char            sb_fname[12];   /* file system name */
 217         __u8            sb_blocklog;    /* log2 of sb_blocksize */
 218         __u8            sb_sectlog;     /* log2 of sb_sectsize */
 219         __u8            sb_inodelog;    /* log2 of sb_inodesize */
 220         __u8            sb_inopblog;    /* log2 of sb_inopblock */
 221         __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 222         __u8            sb_rextslog;    /* log2 of sb_rextents */
 223         __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
 224         __u8            sb_imax_pct;    /* max % of fs for inode space */
 225                                         /* statistics */
 226         /*
 227          * These fields must remain contiguous.  If you really
 228          * want to change their layout, make sure you fix the
 229          * code in xfs_trans_apply_sb_deltas().
 230          */
 231         __be64          sb_icount;      /* allocated inodes */
 232         __be64          sb_ifree;       /* free inodes */
 233         __be64          sb_fdblocks;    /* free data blocks */
 234         __be64          sb_frextents;   /* free realtime extents */
 235         /*
 236          * End contiguous fields.
 237          */
 238         __be64          sb_uquotino;    /* user quota inode */
 239         __be64          sb_gquotino;    /* group quota inode */
 240         __be16          sb_qflags;      /* quota flags */
 241         __u8            sb_flags;       /* misc. flags */
 242         __u8            sb_shared_vn;   /* shared version number */
 243         __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 244         __be32          sb_unit;        /* stripe or raid unit */
 245         __be32          sb_width;       /* stripe or raid width */
 246         __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
 247         __u8            sb_logsectlog;  /* log2 of the log sector size */
 248         __be16          sb_logsectsize; /* sector size for the log, bytes */
 249         __be32          sb_logsunit;    /* stripe unit size for the log */
 250         __be32          sb_features2;   /* additional feature bits */
 251         /*
 252          * bad features2 field as a result of failing to pad the sb
 253          * structure to 64 bits. Some machines will be using this field
 254          * for features2 bits. Easiest just to mark it bad and not use
 255          * it for anything else.
 256          */
 257         __be32          sb_bad_features2;
 258
 259         /* version 5 superblock fields start here */
 260
 261         /* feature masks */
 262         __be32          sb_features_compat;
 263         __be32          sb_features_ro_compat;
 264         __be32          sb_features_incompat;
 265         __be32          sb_features_log_incompat;
 266
 267         __le32          sb_crc;         /* superblock crc */
 268         __be32          sb_spino_align; /* sparse inode chunk alignment */
 269
 270         __be64          sb_pquotino;    /* project quota inode */
 271         __be64          sb_lsn;         /* last write sequence */
 272         uuid_t          sb_meta_uuid;   /* metadata file system unique id */
 273
 274         /* must be padded to 64 bit alignment */
 275 } xfs_dsb_t;
 276
 277
 278 /*
 279  * Misc. Flags - warning - these will be cleared by xfs_repair unless
 280  * a feature bit is set when the flag is used.
 281  */
 282 #define XFS_SBF_NOFLAGS         0x00    /* no flags set */
 283 #define XFS_SBF_READONLY        0x01    /* only read-only mounts allowed */
 284
 285 /*
 286  * define max. shared version we can interoperate with
 287  */
 288 #define XFS_SB_MAX_SHARED_VN    0
 289
 290 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 291
 292 /*
 293  * The first XFS version we support is a v4 superblock with V2 directories.
 294  */
 295 static inline bool xfs_sb_good_v4_features(struct xfs_sb *sbp)
 296 {
 297         if (!(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT))
 298                 return false;
 299
 300         /* check for unknown features in the fs */
 301         if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKBITS) ||
 302             ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
 303              (sbp->sb_features2 & ~XFS_SB_VERSION2_OKBITS)))
 304                 return false;
 305
 306         return true;
 307 }
 308
 309 static inline bool xfs_sb_good_version(struct xfs_sb *sbp)
 310 {
 311         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5)
 312                 return true;
 313         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
 314                 return xfs_sb_good_v4_features(sbp);
 315         return false;
 316 }
 317
 318 /*
 319  * Detect a mismatched features2 field.  Older kernels read/wrote
 320  * this into the wrong slot, so to be safe we keep them in sync.
 321  */
 322 static inline bool xfs_sb_has_mismatched_features2(struct xfs_sb *sbp)
 323 {
 324         return sbp->sb_bad_features2 != sbp->sb_features2;
 325 }
 326
 327 static inline bool xfs_sb_version_hasattr(struct xfs_sb *sbp)
 328 {
 329         return (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT);
 330 }
 331
 332 static inline void xfs_sb_version_addattr(struct xfs_sb *sbp)
 333 {
 334         sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 335 }
 336
 337 static inline bool xfs_sb_version_hasquota(struct xfs_sb *sbp)
 338 {
 339         return (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 340 }
 341
 342 static inline void xfs_sb_version_addquota(struct xfs_sb *sbp)
 343 {
 344         sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 345 }
 346
 347 static inline bool xfs_sb_version_hasalign(struct xfs_sb *sbp)
 348 {
 349         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 350                 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT));
 351 }
 352
 353 static inline bool xfs_sb_version_hasdalign(struct xfs_sb *sbp)
 354 {
 355         return (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 356 }
 357
 358 static inline bool xfs_sb_version_haslogv2(struct xfs_sb *sbp)
 359 {
 360         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 361                (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
 362 }
 363
 364 static inline bool xfs_sb_version_hasextflgbit(struct xfs_sb *sbp)
 365 {
 366         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 367                (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
 368 }
 369
 370 static inline bool xfs_sb_version_hassector(struct xfs_sb *sbp)
 371 {
 372         return (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 373 }
 374
 375 static inline bool xfs_sb_version_hasasciici(struct xfs_sb *sbp)
 376 {
 377         return (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 378 }
 379
 380 static inline bool xfs_sb_version_hasmorebits(struct xfs_sb *sbp)
 381 {
 382         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 ||
 383                (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
 384 }
 385
 386 /*
 387  * sb_features2 bit version macros.
 388  */
 389 static inline bool xfs_sb_version_haslazysbcount(struct xfs_sb *sbp)
 390 {
 391         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 392                (xfs_sb_version_hasmorebits(sbp) &&
 393                 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT));
 394 }
 395
 396 static inline bool xfs_sb_version_hasattr2(struct xfs_sb *sbp)
 397 {
 398         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 399                (xfs_sb_version_hasmorebits(sbp) &&
 400                 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT));
 401 }
 402
 403 static inline void xfs_sb_version_addattr2(struct xfs_sb *sbp)
 404 {
 405         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 406         sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 407 }
 408
 409 static inline void xfs_sb_version_removeattr2(struct xfs_sb *sbp)
 410 {
 411         sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 412         if (!sbp->sb_features2)
 413                 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
 414 }
 415
 416 static inline bool xfs_sb_version_hasprojid32bit(struct xfs_sb *sbp)
 417 {
 418         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) ||
 419                (xfs_sb_version_hasmorebits(sbp) &&
 420                 (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT));
 421 }
 422
 423 static inline void xfs_sb_version_addprojid32bit(struct xfs_sb *sbp)
 424 {
 425         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 426         sbp->sb_features2 |= XFS_SB_VERSION2_PROJID32BIT;
 427 }
 428
 429 /*
 430  * Extended v5 superblock feature masks. These are to be used for new v5
 431  * superblock features only.
 432  *
 433  * Compat features are new features that old kernels will not notice or affect
 434  * and so can mount read-write without issues.
 435  *
 436  * RO-Compat (read only) are features that old kernels can read but will break
 437  * if they write. Hence only read-only mounts of such filesystems are allowed on
 438  * kernels that don't support the feature bit.
 439  *
 440  * InCompat features are features which old kernels will not understand and so
 441  * must not mount.
 442  *
 443  * Log-InCompat features are for changes to log formats or new transactions that
 444  * can't be replayed on older kernels. The fields are set when the filesystem is
 445  * mounted, and a clean unmount clears the fields.
 446  */
 447 #define XFS_SB_FEAT_COMPAT_ALL 0
 448 #define XFS_SB_FEAT_COMPAT_UNKNOWN      ~XFS_SB_FEAT_COMPAT_ALL
 449 static inline bool
 450 xfs_sb_has_compat_feature(
 451         struct xfs_sb   *sbp,
 452         __uint32_t      feature)
 453 {
 454         return (sbp->sb_features_compat & feature) != 0;
 455 }
 456
 457 #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)         /* free inode btree */
 458 #define XFS_SB_FEAT_RO_COMPAT_ALL \
 459                 (XFS_SB_FEAT_RO_COMPAT_FINOBT)
 460 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN   ~XFS_SB_FEAT_RO_COMPAT_ALL
 461 static inline bool
 462 xfs_sb_has_ro_compat_feature(
 463         struct xfs_sb   *sbp,
 464         __uint32_t      feature)
 465 {
 466         return (sbp->sb_features_ro_compat & feature) != 0;
 467 }
 468
 469 #define XFS_SB_FEAT_INCOMPAT_FTYPE      (1 << 0)        /* filetype in dirent */
 470 #define XFS_SB_FEAT_INCOMPAT_SPINODES   (1 << 1)        /* sparse inode chunks */
 471 #define XFS_SB_FEAT_INCOMPAT_META_UUID  (1 << 2)        /* metadata UUID */
 472 #define XFS_SB_FEAT_INCOMPAT_ALL \
 473                 (XFS_SB_FEAT_INCOMPAT_FTYPE|    \
 474                  XFS_SB_FEAT_INCOMPAT_SPINODES| \
 475                  XFS_SB_FEAT_INCOMPAT_META_UUID)
 476
 477 #define XFS_SB_FEAT_INCOMPAT_UNKNOWN    ~XFS_SB_FEAT_INCOMPAT_ALL
 478 static inline bool
 479 xfs_sb_has_incompat_feature(
 480         struct xfs_sb   *sbp,
 481         __uint32_t      feature)
 482 {
 483         return (sbp->sb_features_incompat & feature) != 0;
 484 }
 485
 486 #define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
 487 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN        ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
 488 static inline bool
 489 xfs_sb_has_incompat_log_feature(
 490         struct xfs_sb   *sbp,
 491         __uint32_t      feature)
 492 {
 493         return (sbp->sb_features_log_incompat & feature) != 0;
 494 }
 495
 496 /*
 497  * V5 superblock specific feature checks
 498  */
 499 static inline int xfs_sb_version_hascrc(struct xfs_sb *sbp)
 500 {
 501         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 502 }
 503
 504 static inline int xfs_sb_version_has_pquotino(struct xfs_sb *sbp)
 505 {
 506         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5;
 507 }
 508
 509 static inline int xfs_sb_version_hasftype(struct xfs_sb *sbp)
 510 {
 511         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
 512                 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_FTYPE)) ||
 513                (xfs_sb_version_hasmorebits(sbp) &&
 514                  (sbp->sb_features2 & XFS_SB_VERSION2_FTYPE));
 515 }
 516
 517 static inline int xfs_sb_version_hasfinobt(xfs_sb_t *sbp)
 518 {
 519         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
 520                 (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_FINOBT);
 521 }
 522
 523 static inline bool xfs_sb_version_hassparseinodes(struct xfs_sb *sbp)
 524 {
 525         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
 526                 xfs_sb_has_incompat_feature(sbp, XFS_SB_FEAT_INCOMPAT_SPINODES);
 527 }
 528
 529 /*
 530  * XFS_SB_FEAT_INCOMPAT_META_UUID indicates that the metadata UUID
 531  * is stored separately from the user-visible UUID; this allows the
 532  * user-visible UUID to be changed on V5 filesystems which have a
 533  * filesystem UUID stamped into every piece of metadata.
 534  */
 535 static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
 536 {
 537         return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
 538                 (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
 539 }
 540
 541 /*
 542  * end of superblock version macros
 543  */
 544
 545 static inline bool
 546 xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
 547 {
 548         return (ino == sbp->sb_uquotino ||
 549                 ino == sbp->sb_gquotino ||
 550                 ino == sbp->sb_pquotino);
 551 }
 552
 553 #define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 554 #define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 555 #define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)((bp)->b_addr))
 556
 557 #define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 558 #define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
 559                         xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
 560 #define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
 561                         XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
 562
 563 /*
 564  * File system sector to basic block conversions.
 565  */
 566 #define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
 567
 568 /*
 569  * File system block to basic block conversions.
 570  */
 571 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
 572 #define XFS_BB_TO_FSB(mp,bb)    \
 573         (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
 574 #define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
 575
 576 /*
 577  * File system block to byte conversions.
 578  */
 579 #define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
 580 #define XFS_B_TO_FSB(mp,b)      \
 581         ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
 582 #define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
 583 #define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
 584
 585 /*
 586  * Allocation group header
 587  *
 588  * This is divided into three structures, placed in sequential 512-byte
 589  * buffers after a copy of the superblock (also in a 512-byte buffer).
 590  */
 591 #define XFS_AGF_MAGIC   0x58414746      /* 'XAGF' */
 592 #define XFS_AGI_MAGIC   0x58414749      /* 'XAGI' */
 593 #define XFS_AGFL_MAGIC  0x5841464c      /* 'XAFL' */
 594 #define XFS_AGF_VERSION 1
 595 #define XFS_AGI_VERSION 1
 596
 597 #define XFS_AGF_GOOD_VERSION(v) ((v) == XFS_AGF_VERSION)
 598 #define XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
 599
 600 /*
 601  * Btree number 0 is bno, 1 is cnt.  This value gives the size of the
 602  * arrays below.
 603  */
 604 #define XFS_BTNUM_AGF   ((int)XFS_BTNUM_CNTi + 1)
 605
 606 /*
 607  * The second word of agf_levels in the first a.g. overlaps the EFS
 608  * superblock's magic number.  Since the magic numbers valid for EFS
 609  * are > 64k, our value cannot be confused for an EFS superblock's.
 610  */
 611
 612 typedef struct xfs_agf {
 613         /*
 614          * Common allocation group header information
 615          */
 616         __be32          agf_magicnum;   /* magic number == XFS_AGF_MAGIC */
 617         __be32          agf_versionnum; /* header version == XFS_AGF_VERSION */
 618         __be32          agf_seqno;      /* sequence # starting from 0 */
 619         __be32          agf_length;     /* size in blocks of a.g. */
 620         /*
 621          * Freespace information
 622          */
 623         __be32          agf_roots[XFS_BTNUM_AGF];       /* root blocks */
 624         __be32          agf_spare0;     /* spare field */
 625         __be32          agf_levels[XFS_BTNUM_AGF];      /* btree levels */
 626         __be32          agf_spare1;     /* spare field */
 627
 628         __be32          agf_flfirst;    /* first freelist block's index */
 629         __be32          agf_fllast;     /* last freelist block's index */
 630         __be32          agf_flcount;    /* count of blocks in freelist */
 631         __be32          agf_freeblks;   /* total free blocks */
 632
 633         __be32          agf_longest;    /* longest free space */
 634         __be32          agf_btreeblks;  /* # of blocks held in AGF btrees */
 635         uuid_t          agf_uuid;       /* uuid of filesystem */
 636
 637         /*
 638          * reserve some contiguous space for future logged fields before we add
 639          * the unlogged fields. This makes the range logging via flags and
 640          * structure offsets much simpler.
 641          */
 642         __be64          agf_spare64[16];
 643
 644         /* unlogged fields, written during buffer writeback. */
 645         __be64          agf_lsn;        /* last write sequence */
 646         __be32          agf_crc;        /* crc of agf sector */
 647         __be32          agf_spare2;
 648
 649         /* structure must be padded to 64 bit alignment */
 650 } xfs_agf_t;
 651
 652 #define XFS_AGF_CRC_OFF         offsetof(struct xfs_agf, agf_crc)
 653
 654 #define XFS_AGF_MAGICNUM        0x00000001
 655 #define XFS_AGF_VERSIONNUM      0x00000002
 656 #define XFS_AGF_SEQNO           0x00000004
 657 #define XFS_AGF_LENGTH          0x00000008
 658 #define XFS_AGF_ROOTS           0x00000010
 659 #define XFS_AGF_LEVELS          0x00000020
 660 #define XFS_AGF_FLFIRST         0x00000040
 661 #define XFS_AGF_FLLAST          0x00000080
 662 #define XFS_AGF_FLCOUNT         0x00000100
 663 #define XFS_AGF_FREEBLKS        0x00000200
 664 #define XFS_AGF_LONGEST         0x00000400
 665 #define XFS_AGF_BTREEBLKS       0x00000800
 666 #define XFS_AGF_UUID            0x00001000
 667 #define XFS_AGF_NUM_BITS        13
 668 #define XFS_AGF_ALL_BITS        ((1 << XFS_AGF_NUM_BITS) - 1)
 669
 670 #define XFS_AGF_FLAGS \
 671         { XFS_AGF_MAGICNUM,     "MAGICNUM" }, \
 672         { XFS_AGF_VERSIONNUM,   "VERSIONNUM" }, \
 673         { XFS_AGF_SEQNO,        "SEQNO" }, \
 674         { XFS_AGF_LENGTH,       "LENGTH" }, \
 675         { XFS_AGF_ROOTS,        "ROOTS" }, \
 676         { XFS_AGF_LEVELS,       "LEVELS" }, \
 677         { XFS_AGF_FLFIRST,      "FLFIRST" }, \
 678         { XFS_AGF_FLLAST,       "FLLAST" }, \
 679         { XFS_AGF_FLCOUNT,      "FLCOUNT" }, \
 680         { XFS_AGF_FREEBLKS,     "FREEBLKS" }, \
 681         { XFS_AGF_LONGEST,      "LONGEST" }, \
 682         { XFS_AGF_BTREEBLKS,    "BTREEBLKS" }, \
 683         { XFS_AGF_UUID,         "UUID" }
 684
 685 /* disk block (xfs_daddr_t) in the AG */
 686 #define XFS_AGF_DADDR(mp)       ((xfs_daddr_t)(1 << (mp)->m_sectbb_log))
 687 #define XFS_AGF_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGF_DADDR(mp))
 688 #define XFS_BUF_TO_AGF(bp)      ((xfs_agf_t *)((bp)->b_addr))
 689
 690 /*
 691  * Size of the unlinked inode hash table in the agi.
 692  */
 693 #define XFS_AGI_UNLINKED_BUCKETS        64
 694
 695 typedef struct xfs_agi {
 696         /*
 697          * Common allocation group header information
 698          */
 699         __be32          agi_magicnum;   /* magic number == XFS_AGI_MAGIC */
 700         __be32          agi_versionnum; /* header version == XFS_AGI_VERSION */
 701         __be32          agi_seqno;      /* sequence # starting from 0 */
 702         __be32          agi_length;     /* size in blocks of a.g. */
 703         /*
 704          * Inode information
 705          * Inodes are mapped by interpreting the inode number, so no
 706          * mapping data is needed here.
 707          */
 708         __be32          agi_count;      /* count of allocated inodes */
 709         __be32          agi_root;       /* root of inode btree */
 710         __be32          agi_level;      /* levels in inode btree */
 711         __be32          agi_freecount;  /* number of free inodes */
 712
 713         __be32          agi_newino;     /* new inode just allocated */
 714         __be32          agi_dirino;     /* last directory inode chunk */
 715         /*
 716          * Hash table of inodes which have been unlinked but are
 717          * still being referenced.
 718          */
 719         __be32          agi_unlinked[XFS_AGI_UNLINKED_BUCKETS];
 720         /*
 721          * This marks the end of logging region 1 and start of logging region 2.
 722          */
 723         uuid_t          agi_uuid;       /* uuid of filesystem */
 724         __be32          agi_crc;        /* crc of agi sector */
 725         __be32          agi_pad32;
 726         __be64          agi_lsn;        /* last write sequence */
 727
 728         __be32          agi_free_root; /* root of the free inode btree */
 729         __be32          agi_free_level;/* levels in free inode btree */
 730
 731         /* structure must be padded to 64 bit alignment */
 732 } xfs_agi_t;
 733
 734 #define XFS_AGI_CRC_OFF         offsetof(struct xfs_agi, agi_crc)
 735
 736 #define XFS_AGI_MAGICNUM        (1 << 0)
 737 #define XFS_AGI_VERSIONNUM      (1 << 1)
 738 #define XFS_AGI_SEQNO           (1 << 2)
 739 #define XFS_AGI_LENGTH          (1 << 3)
 740 #define XFS_AGI_COUNT           (1 << 4)
 741 #define XFS_AGI_ROOT            (1 << 5)
 742 #define XFS_AGI_LEVEL           (1 << 6)
 743 #define XFS_AGI_FREECOUNT       (1 << 7)
 744 #define XFS_AGI_NEWINO          (1 << 8)
 745 #define XFS_AGI_DIRINO          (1 << 9)
 746 #define XFS_AGI_UNLINKED        (1 << 10)
 747 #define XFS_AGI_NUM_BITS_R1     11      /* end of the 1st agi logging region */
 748 #define XFS_AGI_ALL_BITS_R1     ((1 << XFS_AGI_NUM_BITS_R1) - 1)
 749 #define XFS_AGI_FREE_ROOT       (1 << 11)
 750 #define XFS_AGI_FREE_LEVEL      (1 << 12)
 751 #define XFS_AGI_NUM_BITS_R2     13
 752
 753 /* disk block (xfs_daddr_t) in the AG */
 754 #define XFS_AGI_DADDR(mp)       ((xfs_daddr_t)(2 << (mp)->m_sectbb_log))
 755 #define XFS_AGI_BLOCK(mp)       XFS_HDR_BLOCK(mp, XFS_AGI_DADDR(mp))
 756 #define XFS_BUF_TO_AGI(bp)      ((xfs_agi_t *)((bp)->b_addr))
 757
 758 /*
 759  * The third a.g. block contains the a.g. freelist, an array
 760  * of block pointers to blocks owned by the allocation btree code.
 761  */
 762 #define XFS_AGFL_DADDR(mp)      ((xfs_daddr_t)(3 << (mp)->m_sectbb_log))
 763 #define XFS_AGFL_BLOCK(mp)      XFS_HDR_BLOCK(mp, XFS_AGFL_DADDR(mp))
 764 #define XFS_BUF_TO_AGFL(bp)     ((xfs_agfl_t *)((bp)->b_addr))
 765
 766 #define XFS_BUF_TO_AGFL_BNO(mp, bp) \
 767         (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
 768                 &(XFS_BUF_TO_AGFL(bp)->agfl_bno[0]) : \
 769                 (__be32 *)(bp)->b_addr)
 770
 771 /*
 772  * Size of the AGFL.  For CRC-enabled filesystes we steal a couple of
 773  * slots in the beginning of the block for a proper header with the
 774  * location information and CRC.
 775  */
 776 #define XFS_AGFL_SIZE(mp) \
 777         (((mp)->m_sb.sb_sectsize - \
 778          (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
 779                 sizeof(struct xfs_agfl) : 0)) / \
 780           sizeof(xfs_agblock_t))
 781
 782 typedef struct xfs_agfl {
 783         __be32          agfl_magicnum;
 784         __be32          agfl_seqno;
 785         uuid_t          agfl_uuid;
 786         __be64          agfl_lsn;
 787         __be32          agfl_crc;
 788         __be32          agfl_bno[];     /* actually XFS_AGFL_SIZE(mp) */
 789 } __attribute__((packed)) xfs_agfl_t;
 790
 791 #define XFS_AGFL_CRC_OFF        offsetof(struct xfs_agfl, agfl_crc)
 792
 793 #define XFS_AGB_TO_FSB(mp,agno,agbno)   \
 794         (((xfs_fsblock_t)(agno) << (mp)->m_sb.sb_agblklog) | (agbno))
 795 #define XFS_FSB_TO_AGNO(mp,fsbno)       \
 796         ((xfs_agnumber_t)((fsbno) >> (mp)->m_sb.sb_agblklog))
 797 #define XFS_FSB_TO_AGBNO(mp,fsbno)      \
 798         ((xfs_agblock_t)((fsbno) & xfs_mask32lo((mp)->m_sb.sb_agblklog)))
 799 #define XFS_AGB_TO_DADDR(mp,agno,agbno) \
 800         ((xfs_daddr_t)XFS_FSB_TO_BB(mp, \
 801                 (xfs_fsblock_t)(agno) * (mp)->m_sb.sb_agblocks + (agbno)))
 802 #define XFS_AG_DADDR(mp,agno,d)         (XFS_AGB_TO_DADDR(mp, agno, 0) + (d))
 803
 804 /*
 805  * For checking for bad ranges of xfs_daddr_t's, covering multiple
 806  * allocation groups or a single xfs_daddr_t that's a superblock copy.
 807  */
 808 #define XFS_AG_CHECK_DADDR(mp,d,len)    \
 809         ((len) == 1 ? \
 810             ASSERT((d) == XFS_SB_DADDR || \
 811                    xfs_daddr_to_agbno(mp, d) != XFS_SB_DADDR) : \
 812             ASSERT(xfs_daddr_to_agno(mp, d) == \
 813                    xfs_daddr_to_agno(mp, (d) + (len) - 1)))
 814
 815 typedef struct xfs_timestamp {
 816         __be32          t_sec;          /* timestamp seconds */
 817         __be32          t_nsec;         /* timestamp nanoseconds */
 818 } xfs_timestamp_t;
 819
 820 /*
 821  * On-disk inode structure.
 822  *
 823  * This is just the header or "dinode core", the inode is expanded to fill a
 824  * variable size the leftover area split into a data and an attribute fork.
 825  * The format of the data and attribute fork depends on the format of the
 826  * inode as indicated by di_format and di_aformat.  To access the data and
 827  * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
 828  * below.
 829  *
 830  * There is a very similar struct icdinode in xfs_inode which matches the
 831  * layout of the first 96 bytes of this structure, but is kept in native
 832  * format instead of big endian.
 833  *
 834  * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
 835  * padding field for v3 inodes.
 836  */
 837 #define XFS_DINODE_MAGIC                0x494e  /* 'IN' */
 838 #define XFS_DINODE_GOOD_VERSION(v)      ((v) >= 1 && (v) <= 3)
 839 typedef struct xfs_dinode {
 840         __be16          di_magic;       /* inode magic # = XFS_DINODE_MAGIC */
 841         __be16          di_mode;        /* mode and type of file */
 842         __u8            di_version;     /* inode version */
 843         __u8            di_format;      /* format of di_c data */
 844         __be16          di_onlink;      /* old number of links to file */
 845         __be32          di_uid;         /* owner's user id */
 846         __be32          di_gid;         /* owner's group id */
 847         __be32          di_nlink;       /* number of links to file */
 848         __be16          di_projid_lo;   /* lower part of owner's project id */
 849         __be16          di_projid_hi;   /* higher part owner's project id */
 850         __u8            di_pad[6];      /* unused, zeroed space */
 851         __be16          di_flushiter;   /* incremented on flush */
 852         xfs_timestamp_t di_atime;       /* time last accessed */
 853         xfs_timestamp_t di_mtime;       /* time last modified */
 854         xfs_timestamp_t di_ctime;       /* time created/inode modified */
 855         __be64          di_size;        /* number of bytes in file */
 856         __be64          di_nblocks;     /* # of direct & btree blocks used */
 857         __be32          di_extsize;     /* basic/minimum extent size for file */
 858         __be32          di_nextents;    /* number of extents in data fork */
 859         __be16          di_anextents;   /* number of extents in attribute fork*/
 860         __u8            di_forkoff;     /* attr fork offs, <<3 for 64b align */
 861         __s8            di_aformat;     /* format of attr fork's data */
 862         __be32          di_dmevmask;    /* DMIG event mask */
 863         __be16          di_dmstate;     /* DMIG state info */
 864         __be16          di_flags;       /* random flags, XFS_DIFLAG_... */
 865         __be32          di_gen;         /* generation number */
 866
 867         /* di_next_unlinked is the only non-core field in the old dinode */
 868         __be32          di_next_unlinked;/* agi unlinked list ptr */
 869
 870         /* start of the extended dinode, writable fields */
 871         __le32          di_crc;         /* CRC of the inode */
 872         __be64          di_changecount; /* number of attribute changes */
 873         __be64          di_lsn;         /* flush sequence */
 874         __be64          di_flags2;      /* more random flags */
 875         __u8            di_pad2[16];    /* more padding for future expansion */
 876
 877         /* fields only written to during inode creation */
 878         xfs_timestamp_t di_crtime;      /* time created */
 879         __be64          di_ino;         /* inode number */
 880         uuid_t          di_uuid;        /* UUID of the filesystem */
 881
 882         /* structure must be padded to 64 bit alignment */
 883 } xfs_dinode_t;
 884
 885 #define XFS_DINODE_CRC_OFF      offsetof(struct xfs_dinode, di_crc)
 886
 887 #define DI_MAX_FLUSH 0xffff
 888
 889 /*
 890  * Size of the core inode on disk.  Version 1 and 2 inodes have
 891  * the same size, but version 3 has grown a few additional fields.
 892  */
 893 static inline uint xfs_dinode_size(int version)
 894 {
 895         if (version == 3)
 896                 return sizeof(struct xfs_dinode);
 897         return offsetof(struct xfs_dinode, di_crc);
 898 }
 899
 900 /*
 901  * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
 902  * Since the pathconf interface is signed, we use 2^31 - 1 instead.
 903  * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
 904  */
 905 #define XFS_MAXLINK             ((1U << 31) - 1U)
 906 #define XFS_MAXLINK_1           65535U
 907
 908 /*
 909  * Values for di_format
 910  */
 911 typedef enum xfs_dinode_fmt {
 912         XFS_DINODE_FMT_DEV,             /* xfs_dev_t */
 913         XFS_DINODE_FMT_LOCAL,           /* bulk data */
 914         XFS_DINODE_FMT_EXTENTS,         /* struct xfs_bmbt_rec */
 915         XFS_DINODE_FMT_BTREE,           /* struct xfs_bmdr_block */
 916         XFS_DINODE_FMT_UUID             /* uuid_t */
 917 } xfs_dinode_fmt_t;
 918
 919 /*
 920  * Inode minimum and maximum sizes.
 921  */
 922 #define XFS_DINODE_MIN_LOG      8
 923 #define XFS_DINODE_MAX_LOG      11
 924 #define XFS_DINODE_MIN_SIZE     (1 << XFS_DINODE_MIN_LOG)
 925 #define XFS_DINODE_MAX_SIZE     (1 << XFS_DINODE_MAX_LOG)
 926
 927 /*
 928  * Inode size for given fs.
 929  */
 930 #define XFS_LITINO(mp, version) \
 931         ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
 932
 933 /*
 934  * Inode data & attribute fork sizes, per inode.
 935  */
 936 #define XFS_DFORK_Q(dip)                ((dip)->di_forkoff != 0)
 937 #define XFS_DFORK_BOFF(dip)             ((int)((dip)->di_forkoff << 3))
 938
 939 #define XFS_DFORK_DSIZE(dip,mp) \
 940         (XFS_DFORK_Q(dip) ? \
 941                 XFS_DFORK_BOFF(dip) : \
 942                 XFS_LITINO(mp, (dip)->di_version))
 943 #define XFS_DFORK_ASIZE(dip,mp) \
 944         (XFS_DFORK_Q(dip) ? \
 945                 XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
 946                 0)
 947 #define XFS_DFORK_SIZE(dip,mp,w) \
 948         ((w) == XFS_DATA_FORK ? \
 949                 XFS_DFORK_DSIZE(dip, mp) : \
 950                 XFS_DFORK_ASIZE(dip, mp))
 951
 952 /*
 953  * Return pointers to the data or attribute forks.
 954  */
 955 #define XFS_DFORK_DPTR(dip) \
 956         ((char *)dip + xfs_dinode_size(dip->di_version))
 957 #define XFS_DFORK_APTR(dip)     \
 958         (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
 959 #define XFS_DFORK_PTR(dip,w)    \
 960         ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
 961
 962 #define XFS_DFORK_FORMAT(dip,w) \
 963         ((w) == XFS_DATA_FORK ? \
 964                 (dip)->di_format : \
 965                 (dip)->di_aformat)
 966 #define XFS_DFORK_NEXTENTS(dip,w) \
 967         ((w) == XFS_DATA_FORK ? \
 968                 be32_to_cpu((dip)->di_nextents) : \
 969                 be16_to_cpu((dip)->di_anextents))
 970
 971 /*
 972  * For block and character special files the 32bit dev_t is stored at the
 973  * beginning of the data fork.
 974  */
 975 static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
 976 {
 977         return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
 978 }
 979
 980 static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
 981 {
 982         *(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
 983 }
 984
 985 /*
 986  * Values for di_flags
 987  */
 988 #define XFS_DIFLAG_REALTIME_BIT  0      /* file's blocks come from rt area */
 989 #define XFS_DIFLAG_PREALLOC_BIT  1      /* file space has been preallocated */
 990 #define XFS_DIFLAG_NEWRTBM_BIT   2      /* for rtbitmap inode, new format */
 991 #define XFS_DIFLAG_IMMUTABLE_BIT 3      /* inode is immutable */
 992 #define XFS_DIFLAG_APPEND_BIT    4      /* inode is append-only */
 993 #define XFS_DIFLAG_SYNC_BIT      5      /* inode is written synchronously */
 994 #define XFS_DIFLAG_NOATIME_BIT   6      /* do not update atime */
 995 #define XFS_DIFLAG_NODUMP_BIT    7      /* do not dump */
 996 #define XFS_DIFLAG_RTINHERIT_BIT 8      /* create with realtime bit set */
 997 #define XFS_DIFLAG_PROJINHERIT_BIT   9  /* create with parents projid */
 998 #define XFS_DIFLAG_NOSYMLINKS_BIT   10  /* disallow symlink creation */
 999 #define XFS_DIFLAG_EXTSIZE_BIT      11  /* inode extent size allocator hint */
1000 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12  /* inherit inode extent size */
1001 #define XFS_DIFLAG_NODEFRAG_BIT     13  /* do not reorganize/defragment */
1002 #define XFS_DIFLAG_FILESTREAM_BIT   14  /* use filestream allocator */
1003 #define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
1004 #define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
1005 #define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
1006 #define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
1007 #define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
1008 #define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
1009 #define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
1010 #define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
1011 #define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
1012 #define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
1013 #define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
1014 #define XFS_DIFLAG_EXTSIZE       (1 << XFS_DIFLAG_EXTSIZE_BIT)
1015 #define XFS_DIFLAG_EXTSZINHERIT  (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
1016 #define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
1017 #define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)
1018
1019 #define XFS_DIFLAG_ANY \
1020         (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
1021          XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
1022          XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
1023          XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
1024          XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
1025
1026 /*
1027  * Values for di_flags2 These start by being exposed to userspace in the upper
1028  * 16 bits of the XFS_XFLAG_s range.
1029  */
1030 #define XFS_DIFLAG2_DAX_BIT     0       /* use DAX for this inode */
1031 #define XFS_DIFLAG2_DAX         (1 << XFS_DIFLAG2_DAX_BIT)
1032
1033 #define XFS_DIFLAG2_ANY         (XFS_DIFLAG2_DAX)
1034
1035 /*
1036  * Inode number format:
1037  * low inopblog bits - offset in block
1038  * next agblklog bits - block number in ag
1039  * next agno_log bits - ag number
1040  * high agno_log-agblklog-inopblog bits - 0
1041  */
1042 #define XFS_INO_MASK(k)                 (__uint32_t)((1ULL << (k)) - 1)
1043 #define XFS_INO_OFFSET_BITS(mp)         (mp)->m_sb.sb_inopblog
1044 #define XFS_INO_AGBNO_BITS(mp)          (mp)->m_sb.sb_agblklog
1045 #define XFS_INO_AGINO_BITS(mp)          (mp)->m_agino_log
1046 #define XFS_INO_AGNO_BITS(mp)           (mp)->m_agno_log
1047 #define XFS_INO_BITS(mp)                \
1048         XFS_INO_AGNO_BITS(mp) + XFS_INO_AGINO_BITS(mp)
1049 #define XFS_INO_TO_AGNO(mp,i)           \
1050         ((xfs_agnumber_t)((i) >> XFS_INO_AGINO_BITS(mp)))
1051 #define XFS_INO_TO_AGINO(mp,i)          \
1052         ((xfs_agino_t)(i) & XFS_INO_MASK(XFS_INO_AGINO_BITS(mp)))
1053 #define XFS_INO_TO_AGBNO(mp,i)          \
1054         (((xfs_agblock_t)(i) >> XFS_INO_OFFSET_BITS(mp)) & \
1055                 XFS_INO_MASK(XFS_INO_AGBNO_BITS(mp)))
1056 #define XFS_INO_TO_OFFSET(mp,i)         \
1057         ((int)(i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1058 #define XFS_INO_TO_FSB(mp,i)            \
1059         XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i))
1060 #define XFS_AGINO_TO_INO(mp,a,i)        \
1061         (((xfs_ino_t)(a) << XFS_INO_AGINO_BITS(mp)) | (i))
1062 #define XFS_AGINO_TO_AGBNO(mp,i)        ((i) >> XFS_INO_OFFSET_BITS(mp))
1063 #define XFS_AGINO_TO_OFFSET(mp,i)       \
1064         ((i) & XFS_INO_MASK(XFS_INO_OFFSET_BITS(mp)))
1065 #define XFS_OFFBNO_TO_AGINO(mp,b,o)     \
1066         ((xfs_agino_t)(((b) << XFS_INO_OFFSET_BITS(mp)) | (o)))
1067
1068 #define XFS_MAXINUMBER          ((xfs_ino_t)((1ULL << 56) - 1ULL))
1069 #define XFS_MAXINUMBER_32       ((xfs_ino_t)((1ULL << 32) - 1ULL))
1070
1071 /*
1072  * RealTime Device format definitions
1073  */
1074
1075 /* Min and max rt extent sizes, specified in bytes */
1076 #define XFS_MAX_RTEXTSIZE       (1024 * 1024 * 1024)    /* 1GB */
1077 #define XFS_DFL_RTEXTSIZE       (64 * 1024)             /* 64kB */
1078 #define XFS_MIN_RTEXTSIZE       (4 * 1024)              /* 4kB */
1079
1080 #define XFS_BLOCKSIZE(mp)       ((mp)->m_sb.sb_blocksize)
1081 #define XFS_BLOCKMASK(mp)       ((mp)->m_blockmask)
1082 #define XFS_BLOCKWSIZE(mp)      ((mp)->m_blockwsize)
1083 #define XFS_BLOCKWMASK(mp)      ((mp)->m_blockwmask)
1084
1085 /*
1086  * RT Summary and bit manipulation macros.
1087  */
1088 #define XFS_SUMOFFS(mp,ls,bb)   ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
1089 #define XFS_SUMOFFSTOBLOCK(mp,s)        \
1090         (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
1091 #define XFS_SUMPTR(mp,bp,so)    \
1092         ((xfs_suminfo_t *)((bp)->b_addr + \
1093                 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
1094
1095 #define XFS_BITTOBLOCK(mp,bi)   ((bi) >> (mp)->m_blkbit_log)
1096 #define XFS_BLOCKTOBIT(mp,bb)   ((bb) << (mp)->m_blkbit_log)
1097 #define XFS_BITTOWORD(mp,bi)    \
1098         ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
1099
1100 #define XFS_RTMIN(a,b)  ((a) < (b) ? (a) : (b))
1101 #define XFS_RTMAX(a,b)  ((a) > (b) ? (a) : (b))
1102
1103 #define XFS_RTLOBIT(w)  xfs_lowbit32(w)
1104 #define XFS_RTHIBIT(w)  xfs_highbit32(w)
1105
1106 #define XFS_RTBLOCKLOG(b)       xfs_highbit64(b)
1107
1108 /*
1109  * Dquot and dquot block format definitions
1110  */
1111 #define XFS_DQUOT_MAGIC         0x4451          /* 'DQ' */
1112 #define XFS_DQUOT_VERSION       (u_int8_t)0x01  /* latest version number */
1113
1114 /*
1115  * This is the main portion of the on-disk representation of quota
1116  * information for a user. This is the q_core of the xfs_dquot_t that
1117  * is kept in kernel memory. We pad this with some more expansion room
1118  * to construct the on disk structure.
1119  */
1120 typedef struct  xfs_disk_dquot {
1121         __be16          d_magic;        /* dquot magic = XFS_DQUOT_MAGIC */
1122         __u8            d_version;      /* dquot version */
1123         __u8            d_flags;        /* XFS_DQ_USER/PROJ/GROUP */
1124         __be32          d_id;           /* user,project,group id */
1125         __be64          d_blk_hardlimit;/* absolute limit on disk blks */
1126         __be64          d_blk_softlimit;/* preferred limit on disk blks */
1127         __be64          d_ino_hardlimit;/* maximum # allocated inodes */
1128         __be64          d_ino_softlimit;/* preferred inode limit */
1129         __be64          d_bcount;       /* disk blocks owned by the user */
1130         __be64          d_icount;       /* inodes owned by the user */
1131         __be32          d_itimer;       /* zero if within inode limits if not,
1132                                            this is when we refuse service */
1133         __be32          d_btimer;       /* similar to above; for disk blocks */
1134         __be16          d_iwarns;       /* warnings issued wrt num inodes */
1135         __be16          d_bwarns;       /* warnings issued wrt disk blocks */
1136         __be32          d_pad0;         /* 64 bit align */
1137         __be64          d_rtb_hardlimit;/* absolute limit on realtime blks */
1138         __be64          d_rtb_softlimit;/* preferred limit on RT disk blks */
1139         __be64          d_rtbcount;     /* realtime blocks owned */
1140         __be32          d_rtbtimer;     /* similar to above; for RT disk blocks */
1141         __be16          d_rtbwarns;     /* warnings issued wrt RT disk blocks */
1142         __be16          d_pad;
1143 } xfs_disk_dquot_t;
1144
1145 /*
1146  * This is what goes on disk. This is separated from the xfs_disk_dquot because
1147  * carrying the unnecessary padding would be a waste of memory.
1148  */
1149 typedef struct xfs_dqblk {
1150         xfs_disk_dquot_t  dd_diskdq;    /* portion that lives incore as well */
1151         char              dd_fill[4];   /* filling for posterity */
1152
1153         /*
1154          * These two are only present on filesystems with the CRC bits set.
1155          */
1156         __be32            dd_crc;       /* checksum */
1157         __be64            dd_lsn;       /* last modification in log */
1158         uuid_t            dd_uuid;      /* location information */
1159 } xfs_dqblk_t;
1160
1161 #define XFS_DQUOT_CRC_OFF       offsetof(struct xfs_dqblk, dd_crc)
1162
1163 /*
1164  * Remote symlink format and access functions.
1165  */
1166 #define XFS_SYMLINK_MAGIC       0x58534c4d      /* XSLM */
1167
1168 struct xfs_dsymlink_hdr {
1169         __be32  sl_magic;
1170         __be32  sl_offset;
1171         __be32  sl_bytes;
1172         __be32  sl_crc;
1173         uuid_t  sl_uuid;
1174         __be64  sl_owner;
1175         __be64  sl_blkno;
1176         __be64  sl_lsn;
1177 };
1178
1179 #define XFS_SYMLINK_CRC_OFF     offsetof(struct xfs_dsymlink_hdr, sl_crc)
1180
1181 /*
1182  * The maximum pathlen is 1024 bytes. Since the minimum file system
1183  * blocksize is 512 bytes, we can get a max of 3 extents back from
1184  * bmapi when crc headers are taken into account.
1185  */
1186 #define XFS_SYMLINK_MAPS 3
1187
1188 #define XFS_SYMLINK_BUF_SPACE(mp, bufsize)      \
1189         ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
1190                         sizeof(struct xfs_dsymlink_hdr) : 0))
1191
1192
1193 /*
1194  * Allocation Btree format definitions
1195  *
1196  * There are two on-disk btrees, one sorted by blockno and one sorted
1197  * by blockcount and blockno.  All blocks look the same to make the code
1198  * simpler; if we have time later, we'll make the optimizations.
1199  */
1200 #define XFS_ABTB_MAGIC          0x41425442      /* 'ABTB' for bno tree */
1201 #define XFS_ABTB_CRC_MAGIC      0x41423342      /* 'AB3B' */
1202 #define XFS_ABTC_MAGIC          0x41425443      /* 'ABTC' for cnt tree */
1203 #define XFS_ABTC_CRC_MAGIC      0x41423343      /* 'AB3C' */
1204
1205 /*
1206  * Data record/key structure
1207  */
1208 typedef struct xfs_alloc_rec {
1209         __be32          ar_startblock;  /* starting block number */
1210         __be32          ar_blockcount;  /* count of free blocks */
1211 } xfs_alloc_rec_t, xfs_alloc_key_t;
1212
1213 typedef struct xfs_alloc_rec_incore {
1214         xfs_agblock_t   ar_startblock;  /* starting block number */
1215         xfs_extlen_t    ar_blockcount;  /* count of free blocks */
1216 } xfs_alloc_rec_incore_t;
1217
1218 /* btree pointer type */
1219 typedef __be32 xfs_alloc_ptr_t;
1220
1221 /*
1222  * Block numbers in the AG:
1223  * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3.
1224  */
1225 #define XFS_BNO_BLOCK(mp)       ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1))
1226 #define XFS_CNT_BLOCK(mp)       ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1))
1227
1228
1229 /*
1230  * Inode Allocation Btree format definitions
1231  *
1232  * There is a btree for the inode map per allocation group.
1233  */
1234 #define XFS_IBT_MAGIC           0x49414254      /* 'IABT' */
1235 #define XFS_IBT_CRC_MAGIC       0x49414233      /* 'IAB3' */
1236 #define XFS_FIBT_MAGIC          0x46494254      /* 'FIBT' */
1237 #define XFS_FIBT_CRC_MAGIC      0x46494233      /* 'FIB3' */
1238
1239 typedef __uint64_t      xfs_inofree_t;
1240 #define XFS_INODES_PER_CHUNK            (NBBY * sizeof(xfs_inofree_t))
1241 #define XFS_INODES_PER_CHUNK_LOG        (XFS_NBBYLOG + 3)
1242 #define XFS_INOBT_ALL_FREE              ((xfs_inofree_t)-1)
1243 #define XFS_INOBT_MASK(i)               ((xfs_inofree_t)1 << (i))
1244
1245 #define XFS_INOBT_HOLEMASK_FULL         0       /* holemask for full chunk */
1246 #define XFS_INOBT_HOLEMASK_BITS         (NBBY * sizeof(__uint16_t))
1247 #define XFS_INODES_PER_HOLEMASK_BIT     \
1248         (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t)))
1249
1250 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
1251 {
1252         return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
1253 }
1254
1255 /*
1256  * The on-disk inode record structure has two formats. The original "full"
1257  * format uses a 4-byte freecount. The "sparse" format uses a 1-byte freecount
1258  * and replaces the 3 high-order freecount bytes wth the holemask and inode
1259  * count.
1260  *
1261  * The holemask of the sparse record format allows an inode chunk to have holes
1262  * that refer to blocks not owned by the inode record. This facilitates inode
1263  * allocation in the event of severe free space fragmentation.
1264  */
1265 typedef struct xfs_inobt_rec {
1266         __be32          ir_startino;    /* starting inode number */
1267         union {
1268                 struct {
1269                         __be32  ir_freecount;   /* count of free inodes */
1270                 } f;
1271                 struct {
1272                         __be16  ir_holemask;/* hole mask for sparse chunks */
1273                         __u8    ir_count;       /* total inode count */
1274                         __u8    ir_freecount;   /* count of free inodes */
1275                 } sp;
1276         } ir_u;
1277         __be64          ir_free;        /* free inode mask */
1278 } xfs_inobt_rec_t;
1279
1280 typedef struct xfs_inobt_rec_incore {
1281         xfs_agino_t     ir_startino;    /* starting inode number */
1282         __uint16_t      ir_holemask;    /* hole mask for sparse chunks */
1283         __uint8_t       ir_count;       /* total inode count */
1284         __uint8_t       ir_freecount;   /* count of free inodes (set bits) */
1285         xfs_inofree_t   ir_free;        /* free inode mask */
1286 } xfs_inobt_rec_incore_t;
1287
1288 static inline bool xfs_inobt_issparse(uint16_t holemask)
1289 {
1290         /* non-zero holemask represents a sparse rec. */
1291         return holemask;
1292 }
1293
1294 /*
1295  * Key structure
1296  */
1297 typedef struct xfs_inobt_key {
1298         __be32          ir_startino;    /* starting inode number */
1299 } xfs_inobt_key_t;
1300
1301 /* btree pointer type */
1302 typedef __be32 xfs_inobt_ptr_t;
1303
1304 /*
1305  * block numbers in the AG.
1306  */
1307 #define XFS_IBT_BLOCK(mp)               ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
1308 #define XFS_FIBT_BLOCK(mp)              ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
1309
1310 /*
1311  * The first data block of an AG depends on whether the filesystem was formatted
1312  * with the finobt feature. If so, account for the finobt reserved root btree
1313  * block.
1314  */
1315 #define XFS_PREALLOC_BLOCKS(mp) \
1316         (xfs_sb_version_hasfinobt(&((mp)->m_sb)) ? \
1317          XFS_FIBT_BLOCK(mp) + 1 : \
1318          XFS_IBT_BLOCK(mp) + 1)
1319
1320
1321
1322 /*
1323  * BMAP Btree format definitions
1324  *
1325  * This includes both the root block definition that sits inside an inode fork
1326  * and the record/pointer formats for the leaf/node in the blocks.
1327  */
1328 #define XFS_BMAP_MAGIC          0x424d4150      /* 'BMAP' */
1329 #define XFS_BMAP_CRC_MAGIC      0x424d4133      /* 'BMA3' */
1330
1331 /*
1332  * Bmap root header, on-disk form only.
1333  */
1334 typedef struct xfs_bmdr_block {
1335         __be16          bb_level;       /* 0 is a leaf */
1336         __be16          bb_numrecs;     /* current # of data records */
1337 } xfs_bmdr_block_t;
1338
1339 /*
1340  * Bmap btree record and extent descriptor.
1341  *  l0:63 is an extent flag (value 1 indicates non-normal).
1342  *  l0:9-62 are startoff.
1343  *  l0:0-8 and l1:21-63 are startblock.
1344  *  l1:0-20 are blockcount.
1345  */
1346 #define BMBT_EXNTFLAG_BITLEN    1
1347 #define BMBT_STARTOFF_BITLEN    54
1348 #define BMBT_STARTBLOCK_BITLEN  52
1349 #define BMBT_BLOCKCOUNT_BITLEN  21
1350
1351 typedef struct xfs_bmbt_rec {
1352         __be64                  l0, l1;
1353 } xfs_bmbt_rec_t;
1354
1355 typedef __uint64_t      xfs_bmbt_rec_base_t;    /* use this for casts */
1356 typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
1357
1358 typedef struct xfs_bmbt_rec_host {
1359         __uint64_t              l0, l1;
1360 } xfs_bmbt_rec_host_t;
1361
1362 /*
1363  * Values and macros for delayed-allocation startblock fields.
1364  */
1365 #define STARTBLOCKVALBITS       17
1366 #define STARTBLOCKMASKBITS      (15 + 20)
1367 #define STARTBLOCKMASK          \
1368         (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
1369
1370 static inline int isnullstartblock(xfs_fsblock_t x)
1371 {
1372         return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
1373 }
1374
1375 static inline xfs_fsblock_t nullstartblock(int k)
1376 {
1377         ASSERT(k < (1 << STARTBLOCKVALBITS));
1378         return STARTBLOCKMASK | (k);
1379 }
1380
1381 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
1382 {
1383         return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
1384 }
1385
1386 /*
1387  * Possible extent formats.
1388  */
1389 typedef enum {
1390         XFS_EXTFMT_NOSTATE = 0,
1391         XFS_EXTFMT_HASSTATE
1392 } xfs_exntfmt_t;
1393
1394 /*
1395  * Possible extent states.
1396  */
1397 typedef enum {
1398         XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
1399         XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
1400 } xfs_exntst_t;
1401
1402 /*
1403  * Incore version of above.
1404  */
1405 typedef struct xfs_bmbt_irec
1406 {
1407         xfs_fileoff_t   br_startoff;    /* starting file offset */
1408         xfs_fsblock_t   br_startblock;  /* starting block number */
1409         xfs_filblks_t   br_blockcount;  /* number of blocks */
1410         xfs_exntst_t    br_state;       /* extent state */
1411 } xfs_bmbt_irec_t;
1412
1413 /*
1414  * Key structure for non-leaf levels of the tree.
1415  */
1416 typedef struct xfs_bmbt_key {
1417         __be64          br_startoff;    /* starting file offset */
1418 } xfs_bmbt_key_t, xfs_bmdr_key_t;
1419
1420 /* btree pointer type */
1421 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
1422
1423
1424 /*
1425  * Generic Btree block format definitions
1426  *
1427  * This is a combination of the actual format used on disk for short and long
1428  * format btrees.  The first three fields are shared by both format, but the
1429  * pointers are different and should be used with care.
1430  *
1431  * To get the size of the actual short or long form headers please use the size
1432  * macros below.  Never use sizeof(xfs_btree_block).
1433  *
1434  * The blkno, crc, lsn, owner and uuid fields are only available in filesystems
1435  * with the crc feature bit, and all accesses to them must be conditional on
1436  * that flag.
1437  */
1438 /* short form block header */
1439 struct xfs_btree_block_shdr {
1440         __be32          bb_leftsib;
1441         __be32          bb_rightsib;
1442
1443         __be64          bb_blkno;
1444         __be64          bb_lsn;
1445         uuid_t          bb_uuid;
1446         __be32          bb_owner;
1447         __le32          bb_crc;
1448 };
1449
1450 /* long form block header */
1451 struct xfs_btree_block_lhdr {
1452         __be64          bb_leftsib;
1453         __be64          bb_rightsib;
1454
1455         __be64          bb_blkno;
1456         __be64          bb_lsn;
1457         uuid_t          bb_uuid;
1458         __be64          bb_owner;
1459         __le32          bb_crc;
1460         __be32          bb_pad; /* padding for alignment */
1461 };
1462
1463 struct xfs_btree_block {
1464         __be32          bb_magic;       /* magic number for block type */
1465         __be16          bb_level;       /* 0 is a leaf */
1466         __be16          bb_numrecs;     /* current # of data records */
1467         union {
1468                 struct xfs_btree_block_shdr s;
1469                 struct xfs_btree_block_lhdr l;
1470         } bb_u;                         /* rest */
1471 };
1472
1473 /* size of a short form block */
1474 #define XFS_BTREE_SBLOCK_LEN \
1475         (offsetof(struct xfs_btree_block, bb_u) + \
1476          offsetof(struct xfs_btree_block_shdr, bb_blkno))
1477 /* size of a long form block */
1478 #define XFS_BTREE_LBLOCK_LEN \
1479         (offsetof(struct xfs_btree_block, bb_u) + \
1480          offsetof(struct xfs_btree_block_lhdr, bb_blkno))
1481
1482 /* sizes of CRC enabled btree blocks */
1483 #define XFS_BTREE_SBLOCK_CRC_LEN \
1484         (offsetof(struct xfs_btree_block, bb_u) + \
1485          sizeof(struct xfs_btree_block_shdr))
1486 #define XFS_BTREE_LBLOCK_CRC_LEN \
1487         (offsetof(struct xfs_btree_block, bb_u) + \
1488          sizeof(struct xfs_btree_block_lhdr))
1489
1490 #define XFS_BTREE_SBLOCK_CRC_OFF \
1491         offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
1492 #define XFS_BTREE_LBLOCK_CRC_OFF \
1493         offsetof(struct xfs_btree_block, bb_u.l.bb_crc)
1494
1495 /*
1496  * On-disk XFS access control list structure.
1497  */
1498 struct xfs_acl_entry {
1499         __be32  ae_tag;
1500         __be32  ae_id;
1501         __be16  ae_perm;
1502         __be16  ae_pad;         /* fill the implicit hole in the structure */
1503 };
1504
1505 struct xfs_acl {
1506         __be32                  acl_cnt;
1507         struct xfs_acl_entry    acl_entry[0];
1508 };
1509
1510 /*
1511  * The number of ACL entries allowed is defined by the on-disk format.
1512  * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
1513  * limited only by the maximum size of the xattr that stores the information.
1514  */
1515 #define XFS_ACL_MAX_ENTRIES(mp) \
1516         (xfs_sb_version_hascrc(&mp->m_sb) \
1517                 ?  (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
1518                                                 sizeof(struct xfs_acl_entry) \
1519                 : 25)
1520
1521 #define XFS_ACL_SIZE(cnt) \
1522         (sizeof(struct xfs_acl) + \
1523                 sizeof(struct xfs_acl_entry) * cnt)
1524
1525 #define XFS_ACL_MAX_SIZE(mp) \
1526         XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
1527
1528
1529 /* On-disk XFS extended attribute names */
1530 #define SGI_ACL_FILE            "SGI_ACL_FILE"
1531 #define SGI_ACL_DEFAULT         "SGI_ACL_DEFAULT"
1532 #define SGI_ACL_FILE_SIZE       (sizeof(SGI_ACL_FILE)-1)
1533 #define SGI_ACL_DEFAULT_SIZE    (sizeof(SGI_ACL_DEFAULT)-1)
1534
1535 #endif /* __XFS_FORMAT_H__ */