Commit 87c9607d authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
parent f8c1d702

fs/xfs/scrub/rtbitmap.c

+2 −3
Original line number Diff line number Diff line
@@ -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);