From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:37100 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728642AbfAOKt5 (ORCPT ); Tue, 15 Jan 2019 05:49:57 -0500 Date: Tue, 15 Jan 2019 05:49:54 -0500 From: Brian Foster Subject: Re: [PATCH v2 3/5] xfs: fix off-by-one error in rtbitmap cross-reference Message-ID: <20190115104954.GA23423@bfoster> References: <154697976479.2839.3584921201780682011.stgit@magnolia> <154697978351.2839.11888108672644284957.stgit@magnolia> <20190114203201.GA12689@magnolia> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190114203201.GA12689@magnolia> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, sandeen@sandeen.net On Mon, Jan 14, 2019 at 12:32:01PM -0800, Darrick J. Wong wrote: > From: Darrick J. Wong > > 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 > fs/xfs/scrub/rtbitmap.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c > index 665d4bbb17cc..dbe115b075f7 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);