LXR linux/fs/xfs/xfs

   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
  27struct xfs_buf;
  28struct 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#define XFS_SB_VERSION2_PROJID32BIT     0x00000080      /* 32 bit project id */
  84
  85#define XFS_SB_VERSION2_OKREALFBITS     \
  86        (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
  87         XFS_SB_VERSION2_ATTR2BIT       | \
  88         XFS_SB_VERSION2_PROJID32BIT)
  89#define XFS_SB_VERSION2_OKSASHFBITS     \
  90        (0)
  91#define XFS_SB_VERSION2_OKREALBITS      \
  92        (XFS_SB_VERSION2_OKREALFBITS |  \
  93         XFS_SB_VERSION2_OKSASHFBITS )
  94
  95/*
  96 * Superblock - in core version.  Must match the ondisk version below.
  97 * Must be padded to 64 bit alignment.
  98 */
  99typedef struct xfs_sb {
 100        __uint32_t      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 101        __uint32_t      sb_blocksize;   /* logical block size, bytes */
 102        xfs_drfsbno_t   sb_dblocks;     /* number of data blocks */
 103        xfs_drfsbno_t   sb_rblocks;     /* number of realtime blocks */
 104        xfs_drtbno_t    sb_rextents;    /* number of realtime extents */
 105        uuid_t          sb_uuid;        /* file system unique id */
 106        xfs_dfsbno_t    sb_logstart;    /* starting block of log if internal */
 107        xfs_ino_t       sb_rootino;     /* root inode number */
 108        xfs_ino_t       sb_rbmino;      /* bitmap inode for realtime extents */
 109        xfs_ino_t       sb_rsumino;     /* summary inode for rt bitmap */
 110        xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
 111        xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
 112        xfs_agnumber_t  sb_agcount;     /* number of allocation groups */
 113        xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
 114        xfs_extlen_t    sb_logblocks;   /* number of log blocks */
 115        __uint16_t      sb_versionnum;  /* header version == XFS_SB_VERSION */
 116        __uint16_t      sb_sectsize;    /* volume sector size, bytes */
 117        __uint16_t      sb_inodesize;   /* inode size, bytes */
 118        __uint16_t      sb_inopblock;   /* inodes per block */
 119        char            sb_fname[12];   /* file system name */
 120        __uint8_t       sb_blocklog;    /* log2 of sb_blocksize */
 121        __uint8_t       sb_sectlog;     /* log2 of sb_sectsize */
 122        __uint8_t       sb_inodelog;    /* log2 of sb_inodesize */
 123        __uint8_t       sb_inopblog;    /* log2 of sb_inopblock */
 124        __uint8_t       sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 125        __uint8_t       sb_rextslog;    /* log2 of sb_rextents */
 126        __uint8_t       sb_inprogress;  /* mkfs is in progress, don't mount */
 127        __uint8_t       sb_imax_pct;    /* max % of fs for inode space */
 128                                        /* statistics */
 129        /*
 130         * These fields must remain contiguous.  If you really
 131         * want to change their layout, make sure you fix the
 132         * code in xfs_trans_apply_sb_deltas().
 133         */
 134        __uint64_t      sb_icount;      /* allocated inodes */
 135        __uint64_t      sb_ifree;       /* free inodes */
 136        __uint64_t      sb_fdblocks;    /* free data blocks */
 137        __uint64_t      sb_frextents;   /* free realtime extents */
 138        /*
 139         * End contiguous fields.
 140         */
 141        xfs_ino_t       sb_uquotino;    /* user quota inode */
 142        xfs_ino_t       sb_gquotino;    /* group quota inode */
 143        __uint16_t      sb_qflags;      /* quota flags */
 144        __uint8_t       sb_flags;       /* misc. flags */
 145        __uint8_t       sb_shared_vn;   /* shared version number */
 146        xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 147        __uint32_t      sb_unit;        /* stripe or raid unit */
 148        __uint32_t      sb_width;       /* stripe or raid width */
 149        __uint8_t       sb_dirblklog;   /* log2 of dir block size (fsbs) */
 150        __uint8_t       sb_logsectlog;  /* log2 of the log sector size */
 151        __uint16_t      sb_logsectsize; /* sector size for the log, bytes */
 152        __uint32_t      sb_logsunit;    /* stripe unit size for the log */
 153        __uint32_t      sb_features2;   /* additional feature bits */
 154
 155        /*
 156         * bad features2 field as a result of failing to pad the sb
 157         * structure to 64 bits. Some machines will be using this field
 158         * for features2 bits. Easiest just to mark it bad and not use
 159         * it for anything else.
 160         */
 161        __uint32_t      sb_bad_features2;
 162
 163        /* must be padded to 64 bit alignment */
 164} xfs_sb_t;
 165
 166/*
 167 * Superblock - on disk version.  Must match the in core version above.
 168 * Must be padded to 64 bit alignment.
 169 */
 170typedef struct xfs_dsb {
 171        __be32          sb_magicnum;    /* magic number == XFS_SB_MAGIC */
 172        __be32          sb_blocksize;   /* logical block size, bytes */
 173        __be64          sb_dblocks;     /* number of data blocks */
 174        __be64          sb_rblocks;     /* number of realtime blocks */
 175        __be64          sb_rextents;    /* number of realtime extents */
 176        uuid_t          sb_uuid;        /* file system unique id */
 177        __be64          sb_logstart;    /* starting block of log if internal */
 178        __be64          sb_rootino;     /* root inode number */
 179        __be64          sb_rbmino;      /* bitmap inode for realtime extents */
 180        __be64          sb_rsumino;     /* summary inode for rt bitmap */
 181        __be32          sb_rextsize;    /* realtime extent size, blocks */
 182        __be32          sb_agblocks;    /* size of an allocation group */
 183        __be32          sb_agcount;     /* number of allocation groups */
 184        __be32          sb_rbmblocks;   /* number of rt bitmap blocks */
 185        __be32          sb_logblocks;   /* number of log blocks */
 186        __be16          sb_versionnum;  /* header version == XFS_SB_VERSION */
 187        __be16          sb_sectsize;    /* volume sector size, bytes */
 188        __be16          sb_inodesize;   /* inode size, bytes */
 189        __be16          sb_inopblock;   /* inodes per block */
 190        char            sb_fname[12];   /* file system name */
 191        __u8            sb_blocklog;    /* log2 of sb_blocksize */
 192        __u8            sb_sectlog;     /* log2 of sb_sectsize */
 193        __u8            sb_inodelog;    /* log2 of sb_inodesize */
 194        __u8            sb_inopblog;    /* log2 of sb_inopblock */
 195        __u8            sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
 196        __u8            sb_rextslog;    /* log2 of sb_rextents */
 197        __u8            sb_inprogress;  /* mkfs is in progress, don't mount */
 198        __u8            sb_imax_pct;    /* max % of fs for inode space */
 199                                        /* statistics */
 200        /*
 201         * These fields must remain contiguous.  If you really
 202         * want to change their layout, make sure you fix the
 203         * code in xfs_trans_apply_sb_deltas().
 204         */
 205        __be64          sb_icount;      /* allocated inodes */
 206        __be64          sb_ifree;       /* free inodes */
 207        __be64          sb_fdblocks;    /* free data blocks */
 208        __be64          sb_frextents;   /* free realtime extents */
 209        /*
 210         * End contiguous fields.
 211         */
 212        __be64          sb_uquotino;    /* user quota inode */
 213        __be64          sb_gquotino;    /* group quota inode */
 214        __be16          sb_qflags;      /* quota flags */
 215        __u8            sb_flags;       /* misc. flags */
 216        __u8            sb_shared_vn;   /* shared version number */
 217        __be32          sb_inoalignmt;  /* inode chunk alignment, fsblocks */
 218        __be32          sb_unit;        /* stripe or raid unit */
 219        __be32          sb_width;       /* stripe or raid width */
 220        __u8            sb_dirblklog;   /* log2 of dir block size (fsbs) */
 221        __u8            sb_logsectlog;  /* log2 of the log sector size */
 222        __be16          sb_logsectsize; /* sector size for the log, bytes */
 223        __be32          sb_logsunit;    /* stripe unit size for the log */
 224        __be32          sb_features2;   /* additional feature bits */
 225        /*
 226         * bad features2 field as a result of failing to pad the sb
 227         * structure to 64 bits. Some machines will be using this field
 228         * for features2 bits. Easiest just to mark it bad and not use
 229         * it for anything else.
 230         */
 231        __be32  sb_bad_features2;
 232
 233        /* must be padded to 64 bit alignment */
 234} xfs_dsb_t;
 235
 236/*
 237 * Sequence number values for the fields.
 238 */
 239typedef enum {
 240        XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
 241        XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
 242        XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
 243        XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
 244        XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
 245        XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
 246        XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
 247        XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
 248        XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
 249        XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 250        XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 251        XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
 252        XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
 253        XFS_SBS_FIELDCOUNT
 254} xfs_sb_field_t;
 255
 256/*
 257 * Mask values, defined based on the xfs_sb_field_t values.
 258 * Only define the ones we're using.
 259 */
 260#define XFS_SB_MVAL(x)          (1LL << XFS_SBS_ ## x)
 261#define XFS_SB_UUID             XFS_SB_MVAL(UUID)
 262#define XFS_SB_FNAME            XFS_SB_MVAL(FNAME)
 263#define XFS_SB_ROOTINO          XFS_SB_MVAL(ROOTINO)
 264#define XFS_SB_RBMINO           XFS_SB_MVAL(RBMINO)
 265#define XFS_SB_RSUMINO          XFS_SB_MVAL(RSUMINO)
 266#define XFS_SB_VERSIONNUM       XFS_SB_MVAL(VERSIONNUM)
 267#define XFS_SB_UQUOTINO         XFS_SB_MVAL(UQUOTINO)
 268#define XFS_SB_GQUOTINO         XFS_SB_MVAL(GQUOTINO)
 269#define XFS_SB_QFLAGS           XFS_SB_MVAL(QFLAGS)
 270#define XFS_SB_SHARED_VN        XFS_SB_MVAL(SHARED_VN)
 271#define XFS_SB_UNIT             XFS_SB_MVAL(UNIT)
 272#define XFS_SB_WIDTH            XFS_SB_MVAL(WIDTH)
 273#define XFS_SB_ICOUNT           XFS_SB_MVAL(ICOUNT)
 274#define XFS_SB_IFREE            XFS_SB_MVAL(IFREE)
 275#define XFS_SB_FDBLOCKS         XFS_SB_MVAL(FDBLOCKS)
 276#define XFS_SB_FEATURES2        XFS_SB_MVAL(FEATURES2)
 277#define XFS_SB_BAD_FEATURES2    XFS_SB_MVAL(BAD_FEATURES2)
 278#define XFS_SB_NUM_BITS         ((int)XFS_SBS_FIELDCOUNT)
 279#define XFS_SB_ALL_BITS         ((1LL << XFS_SB_NUM_BITS) - 1)
 280#define XFS_SB_MOD_BITS         \
 281        (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
 282         XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 283         XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 284         XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
 285         XFS_SB_BAD_FEATURES2)
 286
 287
 288/*
 289 * Misc. Flags - warning - these will be cleared by xfs_repair unless
 290 * a feature bit is set when the flag is used.
 291 */
 292#define XFS_SBF_NOFLAGS         0x00    /* no flags set */
 293#define XFS_SBF_READONLY        0x01    /* only read-only mounts allowed */
 294
 295/*
 296 * define max. shared version we can interoperate with
 297 */
 298#define XFS_SB_MAX_SHARED_VN    0
 299
 300#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
 301
 302static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 303{
 304        /* We always support version 1-3 */
 305        if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
 306            sbp->sb_versionnum <= XFS_SB_VERSION_3)
 307                return 1;
 308
 309        /* We support version 4 if all feature bits are supported */
 310        if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
 311                if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
 312                    ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
 313                     (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
 314                        return 0;
 315
 316#ifdef __KERNEL__
 317                if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 318                        return 0;
 319#else
 320                if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
 321                    sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
 322                        return 0;
 323#endif
 324
 325                return 1;
 326        }
 327
 328        return 0;
 329}
 330
 331/*
 332 * Detect a mismatched features2 field.  Older kernels read/wrote
 333 * this into the wrong slot, so to be safe we keep them in sync.
 334 */
 335static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
 336{
 337        return (sbp->sb_bad_features2 != sbp->sb_features2);
 338}
 339
 340static inline unsigned xfs_sb_version_tonew(unsigned v)
 341{
 342        if (v == XFS_SB_VERSION_1)
 343                return XFS_SB_VERSION_4;
 344
 345        if (v == XFS_SB_VERSION_2)
 346                return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 347
 348        return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
 349                XFS_SB_VERSION_NLINKBIT;
 350}
 351
 352static inline unsigned xfs_sb_version_toold(unsigned v)
 353{
 354        if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
 355                return 0;
 356        if (v & XFS_SB_VERSION_NLINKBIT)
 357                return XFS_SB_VERSION_3;
 358        if (v & XFS_SB_VERSION_ATTRBIT)
 359                return XFS_SB_VERSION_2;
 360        return XFS_SB_VERSION_1;
 361}
 362
 363static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
 364{
 365        return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
 366                sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 367                (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 368                 (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
 369}
 370
 371static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 372{
 373        if (sbp->sb_versionnum == XFS_SB_VERSION_1)
 374                sbp->sb_versionnum = XFS_SB_VERSION_2;
 375        else if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
 376                sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
 377        else
 378                sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
 379}
 380
 381static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
 382{
 383        return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
 384                 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 385                  (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
 386}
 387
 388static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 389{
 390        if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
 391                sbp->sb_versionnum = XFS_SB_VERSION_3;
 392        else
 393                sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
 394}
 395
 396static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
 397{
 398        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 399                (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
 400}
 401
 402static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 403{
 404        if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
 405                sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
 406        else
 407                sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
 408                                        XFS_SB_VERSION_QUOTABIT;
 409}
 410
 411static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
 412{
 413        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 414                (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
 415}
 416
 417static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
 418{
 419        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 420                (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
 421}
 422
 423static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
 424{
 425        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 426                (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
 427}
 428
 429static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
 430{
 431        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 432                (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
 433}
 434
 435static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
 436{
 437        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 438                (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
 439}
 440
 441static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
 442{
 443        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 444                (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
 445}
 446
 447static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
 448{
 449        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 450                (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
 451}
 452
 453static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
 454{
 455        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 456                (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
 457}
 458
 459static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
 460{
 461        return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
 462                (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
 463}
 464
 465/*
 466 * sb_features2 bit version macros.
 467 *
 468 * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
 469 *
 470 * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
 471 *      ((xfs_sb_version_hasmorebits(sbp) &&
 472 *       ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
 473 */
 474
 475static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
 476{
 477        return xfs_sb_version_hasmorebits(sbp) &&
 478                (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT);
 479}
 480
 481static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 482{
 483        return xfs_sb_version_hasmorebits(sbp) &&
 484                (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
 485}
 486
 487static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 488{
 489        sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
 490        sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
 491}
 492
 493static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
 494{
 495        sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
 496        if (!sbp->sb_features2)
 497                sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
 498}
 499
 500static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
 501{
 502        return xfs_sb_version_hasmorebits(sbp) &&
 503                (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT);
 504}
 505
 506/*
 507 * end of superblock version macros
 508 */
 509
 510#define XFS_SB_DADDR            ((xfs_daddr_t)0) /* daddr in filesystem/ag */
 511#define XFS_SB_BLOCK(mp)        XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
 512#define XFS_BUF_TO_SBP(bp)      ((xfs_dsb_t *)((bp)->b_addr))
 513
 514#define XFS_HDR_BLOCK(mp,d)     ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
 515#define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
 516                        xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
 517#define XFS_FSB_TO_DADDR(mp,fsbno)      XFS_AGB_TO_DADDR(mp, \
 518                        XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
 519
 520/*
 521 * File system sector to basic block conversions.
 522 */
 523#define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)
 524
 525/*
 526 * File system block to basic block conversions.
 527 */
 528#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
 529#define XFS_BB_TO_FSB(mp,bb)    \
 530        (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
 531#define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)
 532#define XFS_BB_FSB_OFFSET(mp,bb) ((bb) & ((mp)->m_bsize - 1))
 533
 534/*
 535 * File system block to byte conversions.
 536 */
 537#define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
 538#define XFS_B_TO_FSB(mp,b)      \
 539        ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
 540#define XFS_B_TO_FSBT(mp,b)     (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
 541#define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)
 542
 543#endif  /* __XFS_SB_H__ */
 544