xfs_sb.h

Go to the documentation of this file.

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_SB_H__
#define __XFS_SB_H__

/*
 * Super block
 * Fits into a sector-sized buffer at address 0 of each allocation group.
 * Only the first of these is ever updated except during growfs.
 */

struct xfs_buf;
struct xfs_mount;

#define XFS_SB_MAGIC        0x58465342  /* 'XFSB' */
#define XFS_SB_VERSION_1    1       /* 5.3, 6.0.1, 6.1 */
#define XFS_SB_VERSION_2    2       /* 6.2 - attributes */
#define XFS_SB_VERSION_3    3       /* 6.2 - new inode version */
#define XFS_SB_VERSION_4    4       /* 6.2+ - bitmask version */
#define XFS_SB_VERSION_NUMBITS      0x000f
#define XFS_SB_VERSION_ALLFBITS     0xfff0
#define XFS_SB_VERSION_SASHFBITS    0xf000
#define XFS_SB_VERSION_REALFBITS    0x0ff0
#define XFS_SB_VERSION_ATTRBIT      0x0010
#define XFS_SB_VERSION_NLINKBIT     0x0020
#define XFS_SB_VERSION_QUOTABIT     0x0040
#define XFS_SB_VERSION_ALIGNBIT     0x0080
#define XFS_SB_VERSION_DALIGNBIT    0x0100
#define XFS_SB_VERSION_SHAREDBIT    0x0200
#define XFS_SB_VERSION_LOGV2BIT     0x0400
#define XFS_SB_VERSION_SECTORBIT    0x0800
#define XFS_SB_VERSION_EXTFLGBIT    0x1000
#define XFS_SB_VERSION_DIRV2BIT     0x2000
#define XFS_SB_VERSION_BORGBIT      0x4000  /* ASCII only case-insens. */
#define XFS_SB_VERSION_MOREBITSBIT  0x8000
#define XFS_SB_VERSION_OKSASHFBITS  \
    (XFS_SB_VERSION_EXTFLGBIT | \
     XFS_SB_VERSION_DIRV2BIT | \
     XFS_SB_VERSION_BORGBIT)
#define XFS_SB_VERSION_OKREALFBITS  \
    (XFS_SB_VERSION_ATTRBIT | \
     XFS_SB_VERSION_NLINKBIT | \
     XFS_SB_VERSION_QUOTABIT | \
     XFS_SB_VERSION_ALIGNBIT | \
     XFS_SB_VERSION_DALIGNBIT | \
     XFS_SB_VERSION_SHAREDBIT | \
     XFS_SB_VERSION_LOGV2BIT | \
     XFS_SB_VERSION_SECTORBIT | \
     XFS_SB_VERSION_MOREBITSBIT)
#define XFS_SB_VERSION_OKREALBITS   \
    (XFS_SB_VERSION_NUMBITS | \
     XFS_SB_VERSION_OKREALFBITS | \
     XFS_SB_VERSION_OKSASHFBITS)

/*
 * There are two words to hold XFS "feature" bits: the original
 * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
 * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
 *
 * These defines represent bits in sb_features2.
 */
#define XFS_SB_VERSION2_REALFBITS   0x00ffffff  /* Mask: features */
#define XFS_SB_VERSION2_RESERVED1BIT    0x00000001
#define XFS_SB_VERSION2_LAZYSBCOUNTBIT  0x00000002  /* Superblk counters */
#define XFS_SB_VERSION2_RESERVED4BIT    0x00000004
#define XFS_SB_VERSION2_ATTR2BIT    0x00000008  /* Inline attr rework */
#define XFS_SB_VERSION2_PARENTBIT   0x00000010  /* parent pointers */
#define XFS_SB_VERSION2_PROJID32BIT 0x00000080  /* 32 bit project id */

#define XFS_SB_VERSION2_OKREALFBITS \
    (XFS_SB_VERSION2_LAZYSBCOUNTBIT | \
     XFS_SB_VERSION2_ATTR2BIT   | \
     XFS_SB_VERSION2_PROJID32BIT)
#define XFS_SB_VERSION2_OKSASHFBITS \
    (0)
#define XFS_SB_VERSION2_OKREALBITS  \
    (XFS_SB_VERSION2_OKREALFBITS |  \
     XFS_SB_VERSION2_OKSASHFBITS )

/*
 * Superblock - in core version.  Must match the ondisk version below.
 * Must be padded to 64 bit alignment.
 */
typedef struct xfs_sb {
    __uint32_t  sb_magicnum;    /* magic number == XFS_SB_MAGIC */
    __uint32_t  sb_blocksize;   /* logical block size, bytes */
    xfs_drfsbno_t   sb_dblocks; /* number of data blocks */
    xfs_drfsbno_t   sb_rblocks; /* number of realtime blocks */
    xfs_drtbno_t    sb_rextents;    /* number of realtime extents */
    uuid_t      sb_uuid;    /* file system unique id */
    xfs_dfsbno_t    sb_logstart;    /* starting block of log if internal */
    xfs_ino_t   sb_rootino; /* root inode number */
    xfs_ino_t   sb_rbmino;  /* bitmap inode for realtime extents */
    xfs_ino_t   sb_rsumino; /* summary inode for rt bitmap */
    xfs_agblock_t   sb_rextsize;    /* realtime extent size, blocks */
    xfs_agblock_t   sb_agblocks;    /* size of an allocation group */
    xfs_agnumber_t  sb_agcount; /* number of allocation groups */
    xfs_extlen_t    sb_rbmblocks;   /* number of rt bitmap blocks */
    xfs_extlen_t    sb_logblocks;   /* number of log blocks */
    __uint16_t  sb_versionnum;  /* header version == XFS_SB_VERSION */
    __uint16_t  sb_sectsize;    /* volume sector size, bytes */
    __uint16_t  sb_inodesize;   /* inode size, bytes */
    __uint16_t  sb_inopblock;   /* inodes per block */
    char        sb_fname[12];   /* file system name */
    __uint8_t   sb_blocklog;    /* log2 of sb_blocksize */
    __uint8_t   sb_sectlog; /* log2 of sb_sectsize */
    __uint8_t   sb_inodelog;    /* log2 of sb_inodesize */
    __uint8_t   sb_inopblog;    /* log2 of sb_inopblock */
    __uint8_t   sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
    __uint8_t   sb_rextslog;    /* log2 of sb_rextents */
    __uint8_t   sb_inprogress;  /* mkfs is in progress, don't mount */
    __uint8_t   sb_imax_pct;    /* max % of fs for inode space */
                    /* statistics */
    /*
     * These fields must remain contiguous.  If you really
     * want to change their layout, make sure you fix the
     * code in xfs_trans_apply_sb_deltas().
     */
    __uint64_t  sb_icount;  /* allocated inodes */
    __uint64_t  sb_ifree;   /* free inodes */
    __uint64_t  sb_fdblocks;    /* free data blocks */
    __uint64_t  sb_frextents;   /* free realtime extents */
    /*
     * End contiguous fields.
     */
    xfs_ino_t   sb_uquotino;    /* user quota inode */
    xfs_ino_t   sb_gquotino;    /* group quota inode */
    __uint16_t  sb_qflags;  /* quota flags */
    __uint8_t   sb_flags;   /* misc. flags */
    __uint8_t   sb_shared_vn;   /* shared version number */
    xfs_extlen_t    sb_inoalignmt;  /* inode chunk alignment, fsblocks */
    __uint32_t  sb_unit;    /* stripe or raid unit */
    __uint32_t  sb_width;   /* stripe or raid width */
    __uint8_t   sb_dirblklog;   /* log2 of dir block size (fsbs) */
    __uint8_t   sb_logsectlog;  /* log2 of the log sector size */
    __uint16_t  sb_logsectsize; /* sector size for the log, bytes */
    __uint32_t  sb_logsunit;    /* stripe unit size for the log */
    __uint32_t  sb_features2;   /* additional feature bits */

    /*
     * bad features2 field as a result of failing to pad the sb
     * structure to 64 bits. Some machines will be using this field
     * for features2 bits. Easiest just to mark it bad and not use
     * it for anything else.
     */
    __uint32_t  sb_bad_features2;

    /* must be padded to 64 bit alignment */
} xfs_sb_t;

/*
 * Superblock - on disk version.  Must match the in core version above.
 * Must be padded to 64 bit alignment.
 */
typedef struct xfs_dsb {
    __be32      sb_magicnum;    /* magic number == XFS_SB_MAGIC */
    __be32      sb_blocksize;   /* logical block size, bytes */
    __be64      sb_dblocks; /* number of data blocks */
    __be64      sb_rblocks; /* number of realtime blocks */
    __be64      sb_rextents;    /* number of realtime extents */
    uuid_t      sb_uuid;    /* file system unique id */
    __be64      sb_logstart;    /* starting block of log if internal */
    __be64      sb_rootino; /* root inode number */
    __be64      sb_rbmino;  /* bitmap inode for realtime extents */
    __be64      sb_rsumino; /* summary inode for rt bitmap */
    __be32      sb_rextsize;    /* realtime extent size, blocks */
    __be32      sb_agblocks;    /* size of an allocation group */
    __be32      sb_agcount; /* number of allocation groups */
    __be32      sb_rbmblocks;   /* number of rt bitmap blocks */
    __be32      sb_logblocks;   /* number of log blocks */
    __be16      sb_versionnum;  /* header version == XFS_SB_VERSION */
    __be16      sb_sectsize;    /* volume sector size, bytes */
    __be16      sb_inodesize;   /* inode size, bytes */
    __be16      sb_inopblock;   /* inodes per block */
    char        sb_fname[12];   /* file system name */
    __u8        sb_blocklog;    /* log2 of sb_blocksize */
    __u8        sb_sectlog; /* log2 of sb_sectsize */
    __u8        sb_inodelog;    /* log2 of sb_inodesize */
    __u8        sb_inopblog;    /* log2 of sb_inopblock */
    __u8        sb_agblklog;    /* log2 of sb_agblocks (rounded up) */
    __u8        sb_rextslog;    /* log2 of sb_rextents */
    __u8        sb_inprogress;  /* mkfs is in progress, don't mount */
    __u8        sb_imax_pct;    /* max % of fs for inode space */
                    /* statistics */
    /*
     * These fields must remain contiguous.  If you really
     * want to change their layout, make sure you fix the
     * code in xfs_trans_apply_sb_deltas().
     */
    __be64      sb_icount;  /* allocated inodes */
    __be64      sb_ifree;   /* free inodes */
    __be64      sb_fdblocks;    /* free data blocks */
    __be64      sb_frextents;   /* free realtime extents */
    /*
     * End contiguous fields.
     */
    __be64      sb_uquotino;    /* user quota inode */
    __be64      sb_gquotino;    /* group quota inode */
    __be16      sb_qflags;  /* quota flags */
    __u8        sb_flags;   /* misc. flags */
    __u8        sb_shared_vn;   /* shared version number */
    __be32      sb_inoalignmt;  /* inode chunk alignment, fsblocks */
    __be32      sb_unit;    /* stripe or raid unit */
    __be32      sb_width;   /* stripe or raid width */
    __u8        sb_dirblklog;   /* log2 of dir block size (fsbs) */
    __u8        sb_logsectlog;  /* log2 of the log sector size */
    __be16      sb_logsectsize; /* sector size for the log, bytes */
    __be32      sb_logsunit;    /* stripe unit size for the log */
    __be32      sb_features2;   /* additional feature bits */
    /*
     * bad features2 field as a result of failing to pad the sb
     * structure to 64 bits. Some machines will be using this field
     * for features2 bits. Easiest just to mark it bad and not use
     * it for anything else.
     */
    __be32  sb_bad_features2;

    /* must be padded to 64 bit alignment */
} xfs_dsb_t;

/*
 * Sequence number values for the fields.
 */
typedef enum {
    XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
    XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
    XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
    XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
    XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
    XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
    XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
    XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
    XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
    XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
    XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
    XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
    XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
    XFS_SBS_FIELDCOUNT
} xfs_sb_field_t;

/*
 * Mask values, defined based on the xfs_sb_field_t values.
 * Only define the ones we're using.
 */
#define XFS_SB_MVAL(x)      (1LL << XFS_SBS_ ## x)
#define XFS_SB_UUID     XFS_SB_MVAL(UUID)
#define XFS_SB_FNAME        XFS_SB_MVAL(FNAME)
#define XFS_SB_ROOTINO      XFS_SB_MVAL(ROOTINO)
#define XFS_SB_RBMINO       XFS_SB_MVAL(RBMINO)
#define XFS_SB_RSUMINO      XFS_SB_MVAL(RSUMINO)
#define XFS_SB_VERSIONNUM   XFS_SB_MVAL(VERSIONNUM)
#define XFS_SB_UQUOTINO     XFS_SB_MVAL(UQUOTINO)
#define XFS_SB_GQUOTINO     XFS_SB_MVAL(GQUOTINO)
#define XFS_SB_QFLAGS       XFS_SB_MVAL(QFLAGS)
#define XFS_SB_SHARED_VN    XFS_SB_MVAL(SHARED_VN)
#define XFS_SB_UNIT     XFS_SB_MVAL(UNIT)
#define XFS_SB_WIDTH        XFS_SB_MVAL(WIDTH)
#define XFS_SB_ICOUNT       XFS_SB_MVAL(ICOUNT)
#define XFS_SB_IFREE        XFS_SB_MVAL(IFREE)
#define XFS_SB_FDBLOCKS     XFS_SB_MVAL(FDBLOCKS)
#define XFS_SB_FEATURES2    XFS_SB_MVAL(FEATURES2)
#define XFS_SB_BAD_FEATURES2    XFS_SB_MVAL(BAD_FEATURES2)
#define XFS_SB_NUM_BITS     ((int)XFS_SBS_FIELDCOUNT)
#define XFS_SB_ALL_BITS     ((1LL << XFS_SB_NUM_BITS) - 1)
#define XFS_SB_MOD_BITS     \
    (XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
     XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
     XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
     XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
     XFS_SB_BAD_FEATURES2)


/*
 * Misc. Flags - warning - these will be cleared by xfs_repair unless
 * a feature bit is set when the flag is used.
 */
#define XFS_SBF_NOFLAGS     0x00    /* no flags set */
#define XFS_SBF_READONLY    0x01    /* only read-only mounts allowed */

/*
 * define max. shared version we can interoperate with
 */
#define XFS_SB_MAX_SHARED_VN    0

#define XFS_SB_VERSION_NUM(sbp) ((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)

static inline int xfs_sb_good_version(xfs_sb_t *sbp)
{
    /* We always support version 1-3 */
    if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
        sbp->sb_versionnum <= XFS_SB_VERSION_3)
        return 1;

    /* We support version 4 if all feature bits are supported */
    if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
        if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
            ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
             (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
            return 0;

#ifdef __KERNEL__
        if (sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
            return 0;
#else
        if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
            sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
            return 0;
#endif

        return 1;
    }

    return 0;
}

/*
 * Detect a mismatched features2 field.  Older kernels read/wrote
 * this into the wrong slot, so to be safe we keep them in sync.
 */
static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
{
    return (sbp->sb_bad_features2 != sbp->sb_features2);
}

static inline unsigned xfs_sb_version_tonew(unsigned v)
{
    if (v == XFS_SB_VERSION_1)
        return XFS_SB_VERSION_4;

    if (v == XFS_SB_VERSION_2)
        return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;

    return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
        XFS_SB_VERSION_NLINKBIT;
}

static inline unsigned xfs_sb_version_toold(unsigned v)
{
    if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
        return 0;
    if (v & XFS_SB_VERSION_NLINKBIT)
        return XFS_SB_VERSION_3;
    if (v & XFS_SB_VERSION_ATTRBIT)
        return XFS_SB_VERSION_2;
    return XFS_SB_VERSION_1;
}

static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
{
    return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
        sbp->sb_versionnum == XFS_SB_VERSION_3 ||
        (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
         (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
}

static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
{
    if (sbp->sb_versionnum == XFS_SB_VERSION_1)
        sbp->sb_versionnum = XFS_SB_VERSION_2;
    else if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
        sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
    else
        sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
}

static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
{
    return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
         (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
          (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
}

static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
{
    if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
        sbp->sb_versionnum = XFS_SB_VERSION_3;
    else
        sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
}

static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
}

static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
{
    if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
        sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
    else
        sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
                    XFS_SB_VERSION_QUOTABIT;
}

static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
}

static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
}

static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
}

static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
}

static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
}

static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
}

static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
}

static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
}

static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
{
    return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
        (sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
}

/*
 * sb_features2 bit version macros.
 *
 * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
 *
 * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
 *  ((xfs_sb_version_hasmorebits(sbp) &&
 *   ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
 */

static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
{
    return xfs_sb_version_hasmorebits(sbp) &&
        (sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT);
}

static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
{
    return xfs_sb_version_hasmorebits(sbp) &&
        (sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
}

static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
{
    sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
    sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
}

static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
{
    sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
    if (!sbp->sb_features2)
        sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
}

static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
{
    return xfs_sb_version_hasmorebits(sbp) &&
        (sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT);
}

/*
 * end of superblock version macros
 */

#define XFS_SB_DADDR        ((xfs_daddr_t)0) /* daddr in filesystem/ag */
#define XFS_SB_BLOCK(mp)    XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
#define XFS_BUF_TO_SBP(bp)  ((xfs_dsb_t *)((bp)->b_addr))

#define XFS_HDR_BLOCK(mp,d) ((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
#define XFS_DADDR_TO_FSB(mp,d)  XFS_AGB_TO_FSB(mp, \
            xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
#define XFS_FSB_TO_DADDR(mp,fsbno)  XFS_AGB_TO_DADDR(mp, \
            XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))

/*
 * File system sector to basic block conversions.
 */
#define XFS_FSS_TO_BB(mp,sec)   ((sec) << (mp)->m_sectbb_log)

/*
 * File system block to basic block conversions.
 */
#define XFS_FSB_TO_BB(mp,fsbno) ((fsbno) << (mp)->m_blkbb_log)
#define XFS_BB_TO_FSB(mp,bb)    \
    (((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
#define XFS_BB_TO_FSBT(mp,bb)   ((bb) >> (mp)->m_blkbb_log)

/*
 * File system block to byte conversions.
 */
#define XFS_FSB_TO_B(mp,fsbno)  ((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
#define XFS_B_TO_FSB(mp,b)  \
    ((((__uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
#define XFS_B_TO_FSBT(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
#define XFS_B_FSB_OFFSET(mp,b)  ((b) & (mp)->m_blockmask)

#endif  /* __XFS_SB_H__ */