tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
xfs: fix off-by-one error in rtbitmap cross-reference
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>
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fs/xfs/scrub/rtbitmap.c
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fs/xfs/scrub/rtbitmap.c
···
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startext = fsbno;
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endext = fsbno + len - 1;
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do_div(startext, sc->mp->m_sb.sb_rextsize);
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-
if (do_div(endext, sc->mp->m_sb.sb_rextsize))
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endext++;
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-
extcount = endext - startext;
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+
do_div(endext, sc->mp->m_sb.sb_rextsize);
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extcount = endext - startext + 1;
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xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
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error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
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&is_free);