fs/xfs/xfs_sb.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_SB_H__
  19 #define __XFS_SB_H__
  20
  21 /*
  22  * Super block
  23  * Fits into a sector-sized buffer at address 0 of each allocation group.
  24  * Only the first of these is ever updated except during growfs.
  25  */
  26
  27 struct xfs_buf;
  28 struct xfs_mount;
  29
  30 #define XFS_SB_MAGIC            0x58465342      /* 'XFSB' */
  31 #define XFS_SB_VERSION_1        1               /* 5.3, 6.0.1, 6.1 */
  32 #define XFS_SB_VERSION_2        2               /* 6.2 - attributes */
  33 #define XFS_SB_VERSION_3        3               /* 6.2 - new inode version */
  34 #define XFS_SB_VERSION_4        4               /* 6.2+ - bitmask version */
  35 #define XFS_SB_VERSION_NUMBITS          0x000f
  36 #define XFS_SB_VERSION_ALLFBITS         0xfff0
  37 #define XFS_SB_VERSION_SASHFBITS        0xf000
  38 #define XFS_SB_VERSION_REALFBITS        0x0ff0
  39 #define XFS_SB_VERSION_ATTRBIT          0x0010
  40 #define XFS_SB_VERSION_NLINKBIT         0x0020
  41 #define XFS_SB_VERSION_QUOTABIT         0x0040
  42 #define XFS_SB_VERSION_ALIGNBIT         0x0080
  43 #define XFS_SB_VERSION_DALIGNBIT        0x0100
  44 #define XFS_SB_VERSION_SHAREDBIT        0x0200
  45 #define XFS_SB_VERSION_LOGV2BIT         0x0400
  46 #define XFS_SB_VERSION_SECTORBIT        0x0800
  47 #define XFS_SB_VERSION_EXTFLGBIT        0x1000
  48 #define XFS_SB_VERSION_DIRV2BIT         0x2000
  49 #define XFS_SB_VERSION_BORGBIT          0x4000  /* ASCII only case-insens. */
  50 #define XFS_SB_VERSION_MOREBITSBIT      0x8000
  51 #define XFS_SB_VERSION_OKSASHFBITS      \
  52         (XFS_SB_VERSION_EXTFLGBIT | \
  53          XFS_SB_VERSION_DIRV2BIT | \
  54          XFS_SB_VERSION_BORGBIT)
  55 #define XFS_SB_VERSION_OKREALFBITS      \
  56         (XFS_SB_VERSION_ATTRBIT | \
  57          XFS_SB_VERSION_NLINKBIT | \
  58          XFS_SB_VERSION_QUOTABIT | \
  59          XFS_SB_VERSION_ALIGNBIT | \
  60          XFS_SB_VERSION_DALIGNBIT | \
  61          XFS_SB_VERSION_SHAREDBIT | \
  62          XFS_SB_VERSION_LOGV2BIT | \
  63          XFS_SB_VERSION_SECTORBIT | \
  64          XFS_SB_VERSION_MOREBITSBIT)
  65 #define XFS_SB_VERSION_OKREALBITS       \
  66         (XFS_SB_VERSION_NUMBITS | \
  67          XFS_SB_VERSION_OKREALFBITS | \
  68          XFS_SB_VERSION_OKSASHFBITS)
  69
  70 /*
  71  * There are two words to hold XFS "feature" bits: the original
  72  * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
  73  * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
  74  *
  75  * These defines represent bits in sb_features2.
  76  */
  77 #define XFS_SB_VERSION2_REALFBITS       0x00ffffff      /* Mask: features */
  78 #define XFS_SB_VERSION2_RESERVED1BIT    0x00000001
  79 #define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002      /* Superblk counters */
  80 #define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
  81 #define XFS_SB_VERSION2_ATTR2BIT        0x00000008      /* Inline attr rework */
  82 #define XFS_SB_VERSION2_PARENTBIT       0x00000010      /* parent pointers */
  83
  84 #define XFS_SB_VERSION2_OKREALFBITS     \
  85         (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
  86          XFS_SB_VERSION2_ATTR2BIT)
  87 #define XFS_SB_VERSION2_OKSASHFBITS     \
  88         (0)
  89 #define XFS_SB_VERSION2_OKREALBITS      \
  90         (XFS_SB_VERSION2_OKREALFBITS |  \
  91          XFS_SB_VERSION2_OKSASHFBITS )
  92
  93 /*
  94  * Superblock - in core version.  Must match the ondisk version below.
  95  * Must be padded to 64 bit alignment.
  96  */
  97 typedef struct xfs_sb {
  98         __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
  99         __uint32_t      sb_blocksize;   /* logical block size, bytes */
 100         xfs_drfsbno_t   sb_dblocks;     /* number of data blocks */
 101         xfs_drfsbno_t   sb_rblocks;     /* number of realtime blocks */
 102         xfs_drtbno_t    sb_rextents;    /* number of realtime extents */
 103         uuid_t          sb_uuid;        /* file system unique id */
 104         xfs_dfsbno_t    sb_logstart;    /* starting block of log if internal */
 105         xfs_ino_t       sb_rootino;     /* root inode number */
 106         xfs_ino_t       sb_rbmino;      /* bitmap inode for realtime extents */
 107         xfs_ino_t       sb_rsumino;     /* summary inode for rt bitmap */
 108         xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
 109         xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
 110         xfs_agnumber_t  sb_agcount;     /* number of allocation groups */
 111         xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
 112         xfs_extlen_t    sb_logblocks;   /* number of log blocks */
 113         __uint16_t      sb_versionnum;  /* header version == XFS_SB_VERSION */
 114         __uint16_t      sb_sectsize;    /* volume sector size, bytes */
 115         __uint16_t      sb_inodesize;   /* inode size, bytes */
 116         __uint16_t      sb_inopblock;   /* inodes per block */
 117         char            sb_fname[12];   /* file system name */
 118         __uint8_t       sb_blocklog;    /* log2 of sb_blocksize */
 119         __uint8_t       sb_sectlog;     /* log2 of sb_sectsize */
 120         __uint8_t       sb_inodelog;    /* log2 of sb_inodesize */
 121         __uint8_t       sb_inopblog;    /* log2 of sb_inopblock */
 122         __uint8_t       sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 123         __uint8_t       sb_rextslog;    /* log2 of sb_rextents */
 124         __uint8_t       sb_inprogress;  /* mkfs is in progress, don't mount */
 125         __uint8_t       sb_imax_pct;    /* max % of fs for inode space */
 126                                         /* statistics */
 127         /*
 128          * These fields must remain contiguous.  If you really
 129          * want to change their layout, make sure you fix the
 130          * code in xfs_trans_apply_sb_deltas().
 131          */
 132         __uint64_t      sb_icount;      /* allocated inodes */
 133         __uint64_t      sb_ifree;       /* free inodes */
 134         __uint64_t      sb_fdblocks;    /* free data blocks */
 135         __uint64_t      sb_frextents;   /* free realtime extents */
 136         /*
 137          * End contiguous fields.
 138          */
 139         xfs_ino_t       sb_uquotino;    /* user quota inode */
 140         xfs_ino_t       sb_gquotino;    /* group quota inode */
 141         __uint16_t      sb_qflags;      /* quota flags */
 142         __uint8_t       sb_flags;       /* misc. flags */
 143         __uint8_t       sb_shared_vn;   /* shared version number */
 144         xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 145         __uint32_t      sb_unit;        /* stripe or raid unit */
 146         __uint32_t      sb_width;       /* stripe or raid width */
 147         __uint8_t       sb_dirblklog;   /* log2 of dir block size (fsbs) */
 148         __uint8_t       sb_logsectlog;  /* log2 of the log sector size */
 149         __uint16_t      sb_logsectsize; /* sector size for the log, bytes */
 150         __uint32_t      sb_logsunit;    /* stripe unit size for the log */
 151         __uint32_t      sb_features2;   /* additional feature bits */
 152
 153         /*
 154          * bad features2 field as a result of failing to pad the sb
 155          * structure to 64 bits. Some machines will be using this field
 156          * for features2 bits. Easiest just to mark it bad and not use
 157          * it for anything else.
 158          */
 159         __uint32_t      sb_bad_features2;
 160
 161         /* must be padded to 64 bit alignment */
 162 } xfs_sb_t;
 163
 164 /*
 165  * Superblock - on disk version.  Must match the in core version above.
 166  * Must be padded to 64 bit alignment.
 167  */
 168 typedef struct xfs_dsb {
 169         __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 170         __be32          sb_blocksize;   /* logical block size, bytes */
 171         __be64          sb_dblocks;     /* number of data blocks */
 172         __be64          sb_rblocks;     /* number of realtime blocks */
 173         __be64          sb_rextents;    /* number of realtime extents */
 174         uuid_t          sb_uuid;        /* file system unique id */
 175         __be64          sb_logstart;    /* starting block of log if internal */
 176         __be64          sb_rootino;     /* root inode number */
 177         __be64          sb_rbmino;      /* bitmap inode for realtime extents */
 178         __be64          sb_rsumino;     /* summary inode for rt bitmap */
 179         __be32          sb_rextsize;    /* realtime extent size, blocks */
 180         __be32          sb_agblocks;    /* size of an allocation group */
 181         __be32          sb_agcount;     /* number of allocation groups */
 182         __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
 183         __be32          sb_logblocks;   /* number of log blocks */
 184         __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
 185         __be16          sb_sectsize;    /* volume sector size, bytes */
 186         __be16          sb_inodesize;   /* inode size, bytes */
 187         __be16          sb_inopblock;   /* inodes per block */
 188         char            sb_fname[12];   /* file system name */
 189         __u8            sb_blocklog;    /* log2 of sb_blocksize */
 190         __u8            sb_sectlog;     /* log2 of sb_sectsize */
 191         __u8            sb_inodelog;    /* log2 of sb_inodesize */
 192         __u8            sb_inopblog;    /* log2 of sb_inopblock */
 193         __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 194         __u8            sb_rextslog;    /* log2 of sb_rextents */
 195         __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
 196         __u8            sb_imax_pct;    /* max % of fs for inode space */
 197                                         /* statistics */
 198         /*
 199          * These fields must remain contiguous.  If you really
 200          * want to change their layout, make sure you fix the
 201          * code in xfs_trans_apply_sb_deltas().
 202          */
 203         __be64          sb_icount;      /* allocated inodes */
 204         __be64          sb_ifree;       /* free inodes */
 205         __be64          sb_fdblocks;    /* free data blocks */
 206         __be64          sb_frextents;   /* free realtime extents */
 207         /*
 208          * End contiguous fields.
 209          */
 210         __be64          sb_uquotino;    /* user quota inode */
 211         __be64          sb_gquotino;    /* group quota inode */
 212         __be16          sb_qflags;      /* quota flags */
 213         __u8            sb_flags;       /* misc. flags */
 214         __u8            sb_shared_vn;   /* shared version number */
 215         __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 216         __be32          sb_unit;        /* stripe or raid unit */
 217         __be32          sb_width;       /* stripe or raid width */
 218         __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
 219         __u8            sb_logsectlog;  /* log2 of the log sector size */
 220         __be16          sb_logsectsize; /* sector size for the log, bytes */
 221         __be32          sb_logsunit;    /* stripe unit size for the log */
 222         __be32          sb_features2;   /* additional feature bits */
 223         /*
 224          * bad features2 field as a result of failing to pad the sb
 225          * structure to 64 bits. Some machines will be using this field
 226          * for features2 bits. Easiest just to mark it bad and not use
 227          * it for anything else.
 228          */
 229         __be32  sb_bad_features2;
 230
 231         /* must be padded to 64 bit alignment */
 232 } xfs_dsb_t;
 233
 234 /*
 235  * Sequence number values for the fields.
 236  */
 237 typedef enum {
 238         XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
 239         XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
 240         XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
 241         XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
 242         XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
 243         XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
 244         XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
 245         XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
 246         XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
 247         XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 248         XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 249         XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
 250         XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
 251         XFS_SBS_FIELDCOUNT
 252 } xfs_sb_field_t;
 253
 254 /*
 255  * Mask values, defined based on the xfs_sb_field_t values.
 256  * Only define the ones we're using.
 257  */
 258 #define XFS_SB_MVAL(x)          (1LL << XFS_SBS_ ## x)
 259 #define XFS_SB_UUID             XFS_SB_MVAL(UUID)
 260 #define XFS_SB_FNAME            XFS_SB_MVAL(FNAME)
 261 #define XFS_SB_ROOTINO          XFS_SB_MVAL(ROOTINO)
 262 #define XFS_SB_RBMINO           XFS_SB_MVAL(RBMINO)
 263 #define XFS_SB_RSUMINO          XFS_SB_MVAL(RSUMINO)
 264 #define XFS_SB_VERSIONNUM       XFS_SB_MVAL(VERSIONNUM)
 265 #define XFS_SB_UQUOTINO         XFS_SB_MVAL(UQUOTINO)
 266 #define XFS_SB_GQUOTINO         XFS_SB_MVAL(GQUOTINO)
 267 #define XFS_SB_QFLAGS           XFS_SB_MVAL(QFLAGS)
 268 #define XFS_SB_SHARED_VN        XFS_SB_MVAL(SHARED_VN)
 269 #define XFS_SB_UNIT             XFS_SB_MVAL(UNIT)
 270 #define XFS_SB_WIDTH            XFS_SB_MVAL(WIDTH)
 271 #define XFS_SB_ICOUNT           XFS_SB_MVAL(ICOUNT)
 272 #define XFS_SB_IFREE            XFS_SB_MVAL(IFREE)
 273 #define XFS_SB_FDBLOCKS         XFS_SB_MVAL(FDBLOCKS)
 274 #define XFS_SB_FEATURES2        XFS_SB_MVAL(FEATURES2)
 275 #define XFS_SB_BAD_FEATURES2    XFS_SB_MVAL(BAD_FEATURES2)
 276 #define XFS_SB_NUM_BITS         ((int)XFS_SBS_FIELDCOUNT)
 277 #define XFS_SB_ALL_BITS         ((1LL << XFS_SB_NUM_BITS) - 1)
 278 #define XFS_SB_MOD_BITS         \
 279         (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
 280          XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 281          XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 282          XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
 283          XFS_SB_BAD_FEATURES2)
 284
 285
 286 /*
 287  * Misc. Flags - warning - these will be cleared by xfs_repair unless
 288  * a feature bit is set when the flag is used.
 289  */
 290 #define XFS_SBF_NOFLAGS         0x00    /* no flags set */
 291 #define XFS_SBF_READONLY        0x01    /* only read-only mounts allowed */
 292
 293 /*
 294  * define max. shared version we can interoperate with
 295  */
 296 #define XFS_SB_MAX_SHARED_VN    0
 297
 298 #define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 299
 300 static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 301 {
 302         /* We always support version 1-3 */
 303         if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
 304             sbp->sb_versionnum <= XFS_SB_VERSION_3)
 305                 return 1;
 306
 307         /* We support version 4 if all feature bits are supported */
 308         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
 309                 if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
 310                     ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
 311                      (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
 312                         return 0;
 313
 314 #ifdef __KERNEL__
 315                 if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 316                         return 0;
 317 #else
 318                 if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
 319                     sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 320                         return 0;
 321 #endif
 322
 323                 return 1;
 324         }
 325
 326         return 0;
 327 }
 328
 329 /*
 330  * Detect a mismatched features2 field.  Older kernels read/wrote
 331  * this into the wrong slot, so to be safe we keep them in sync.
 332  */
 333 static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
 334 {
 335         return (sbp->sb_bad_features2 != sbp->sb_features2);
 336 }
 337
 338 static inline unsigned xfs_sb_version_tonew(unsigned v)
 339 {
 340         if (v == XFS_SB_VERSION_1)
 341                 return XFS_SB_VERSION_4;
 342
 343         if (v == XFS_SB_VERSION_2)
 344                 return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 345
 346         return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
 347                 XFS_SB_VERSION_NLINKBIT;
 348 }
 349
 350 static inline unsigned xfs_sb_version_toold(unsigned v)
 351 {
 352         if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
 353                 return 0;
 354         if (v & XFS_SB_VERSION_NLINKBIT)
 355                 return XFS_SB_VERSION_3;
 356         if (v & XFS_SB_VERSION_ATTRBIT)
 357                 return XFS_SB_VERSION_2;
 358         return XFS_SB_VERSION_1;
 359 }
 360
 361 static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
 362 {
 363         return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
 364                 sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 365                 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 366                  (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
 367 }
 368
 369 static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 370 {
 371         if (sbp->sb_versionnum == XFS_SB_VERSION_1)
 372                 sbp->sb_versionnum = XFS_SB_VERSION_2;
 373         else if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
 374                 sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 375         else
 376                 sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 377 }
 378
 379 static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
 380 {
 381         return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 382                  (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 383                   (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
 384 }
 385
 386 static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 387 {
 388         if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
 389                 sbp->sb_versionnum = XFS_SB_VERSION_3;
 390         else
 391                 sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
 392 }
 393
 394 static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
 395 {
 396         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 397                 (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 398 }
 399
 400 static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 401 {
 402         if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
 403                 sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 404         else
 405                 sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
 406                                         XFS_SB_VERSION_QUOTABIT;
 407 }
 408
 409 static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
 410 {
 411         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 412                 (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
 413 }
 414
 415 static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
 416 {
 417         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 418                 (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 419 }
 420
 421 static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
 422 {
 423         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 424                 (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
 425 }
 426
 427 static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
 428 {
 429         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 430                 (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
 431 }
 432
 433 static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
 434 {
 435         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 436                 (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
 437 }
 438
 439 static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
 440 {
 441         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 442                 (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
 443 }
 444
 445 static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
 446 {
 447         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 448                 (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 449 }
 450
 451 static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
 452 {
 453         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 454                 (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 455 }
 456
 457 static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 458 {
 459         return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 460                 (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
 461 }
 462
 463 /*
 464  * sb_features2 bit version macros.
 465  *
 466  * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
 467  *
 468  * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
 469  *      ((xfs_sb_version_hasmorebits(sbp) &&
 470  *       ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
 471  */
 472
 473 static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
 474 {
 475         return xfs_sb_version_hasmorebits(sbp) &&
 476                 (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT);
 477 }
 478
 479 static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 480 {
 481         return xfs_sb_version_hasmorebits(sbp) &&
 482                 (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
 483 }
 484
 485 static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 486 {
 487         sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 488         sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 489 }
 490
 491 static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
 492 {
 493         sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 494         if (!sbp->sb_features2)
 495                 sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
 496 }
 497
 498 /*
 499  * end of superblock version macros
 500  */
 501
 502 #define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 503 #define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 504 #define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)XFS_BUF_PTR(bp))
 505
 506 #define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 507 #define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
 508                         XFS_DADDR_TO_AGNO(mp,d), XFS_DADDR_TO_AGBNO(mp,d))
 509 #define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
 510                         XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
 511
 512 /*
 513  * File system sector to basic block conversions.
 514  */
 515 #define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
 516
 517 /*
 518  * File system block to basic block conversions.
 519  */
 520 #define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
 521 #define XFS_BB_TO_FSB(mp,bb)    \
 522         (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
 523 #define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
 524 #define XFS_BB_FSB_OFFSET(mp,bb) ((bb) & ((mp)->m_bsize - 1))
 525
 526 /*
 527  * File system block to byte conversions.
 528  */
 529 #define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
 530 #define XFS_B_TO_FSB(mp,b)      \
 531         ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
 532 #define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
 533 #define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
 534
 535 #endif  /* __XFS_SB_H__ */