From: Darrick J. Wong Date: Fri, 1 Feb 2019 17:08:53 +0000 (-0800) Subject: xfs: fix off-by-one error in rtbitmap cross-reference X-Git-Tag: v5.4-rc1~1389^2~64 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=87c9607df2ff73290dcfe08d22f34687ce0142ce;p=platform%2Fkernel%2Flinux-rpi.git 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 Reviewed-by: Brian Foster --- diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c index 665d4bb..dbe115b 100644 --- a/fs/xfs/scrub/rtbitmap.c +++ b/fs/xfs/scrub/rtbitmap.c @@ -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);