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xfs: fix off-by-one error in rtbitmap cross-reference

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Fix an off-by-one error in the realtime bitmap "is used" cross-reference
helper function if the realtime extent size is a single block.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-02-01 09:08:53 -08:00
parent f8c1d7023e
commit 87c9607df2
1 changed files with 2 additions and 3 deletions
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5
fs/xfs/scrub/rtbitmap.c
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@ -141,9 +141,8 @@ xchk_xref_is_used_rt_space(
startext = fsbno;
endext = fsbno + len - 1;
do_div(startext, sc->mp->m_sb.sb_rextsize);
if (do_div(endext, sc->mp->m_sb.sb_rextsize))
endext++;
extcount = endext - startext;
do_div(endext, sc->mp->m_sb.sb_rextsize);
extcount = endext - startext + 1;
xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
&is_free);