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Message-ID: <20231130190120.GM361584@frogsfrogsfrogs>
Date: Thu, 30 Nov 2023 11:01:20 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
Cc: Chandan Babu R <chandan.babu@...cle.com>,
Dave Chinner <dchinner@...hat.com>,
Allison Henderson <allison.henderson@...cle.com>,
Zhang Tianci <zhangtianci.1997@...edance.com>,
Brian Foster <bfoster@...hat.com>, linux-xfs@...r.kernel.org,
linux-kernel@...r.kernel.org, xieyongji@...edance.com, me@...x.top,
Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v3 1/3] xfs: ensure logflagsp is initialized in
xfs_bmap_del_extent_real
On Thu, Nov 30, 2023 at 12:05:14PM +0800, Jiachen Zhang wrote:
> In the case of returning -ENOSPC, ensure logflagsp is initialized by 0.
> Otherwise the caller __xfs_bunmapi will set uninitialized illegal
> tmp_logflags value into xfs log, which might cause unpredictable error
> in the log recovery procedure.
>
> Also, remove the flags variable and set the *logflagsp directly, so that
> the code should be more robust in the long run.
>
> Fixes: 1b24b633aafe ("xfs: move some more code into xfs_bmap_del_extent_real")
> Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
Looks good,
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
--D
> ---
> fs/xfs/libxfs/xfs_bmap.c | 73 +++++++++++++++++-----------------------
> 1 file changed, 31 insertions(+), 42 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
> index be62acffad6c..eacd7f43c952 100644
> --- a/fs/xfs/libxfs/xfs_bmap.c
> +++ b/fs/xfs/libxfs/xfs_bmap.c
> @@ -5010,7 +5010,6 @@ xfs_bmap_del_extent_real(
> xfs_fileoff_t del_endoff; /* first offset past del */
> int do_fx; /* free extent at end of routine */
> int error; /* error return value */
> - int flags = 0;/* inode logging flags */
> struct xfs_bmbt_irec got; /* current extent entry */
> xfs_fileoff_t got_endoff; /* first offset past got */
> int i; /* temp state */
> @@ -5023,6 +5022,8 @@ xfs_bmap_del_extent_real(
> uint32_t state = xfs_bmap_fork_to_state(whichfork);
> struct xfs_bmbt_irec old;
>
> + *logflagsp = 0;
> +
> mp = ip->i_mount;
> XFS_STATS_INC(mp, xs_del_exlist);
>
> @@ -5035,7 +5036,6 @@ xfs_bmap_del_extent_real(
> ASSERT(got_endoff >= del_endoff);
> ASSERT(!isnullstartblock(got.br_startblock));
> qfield = 0;
> - error = 0;
>
> /*
> * If it's the case where the directory code is running with no block
> @@ -5051,13 +5051,13 @@ xfs_bmap_del_extent_real(
> del->br_startoff > got.br_startoff && del_endoff < got_endoff)
> return -ENOSPC;
>
> - flags = XFS_ILOG_CORE;
> + *logflagsp = XFS_ILOG_CORE;
> if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
> if (!(bflags & XFS_BMAPI_REMAP)) {
> error = xfs_rtfree_blocks(tp, del->br_startblock,
> del->br_blockcount);
> if (error)
> - goto done;
> + return error;
> }
>
> do_fx = 0;
> @@ -5072,11 +5072,9 @@ xfs_bmap_del_extent_real(
> if (cur) {
> error = xfs_bmbt_lookup_eq(cur, &got, &i);
> if (error)
> - goto done;
> - if (XFS_IS_CORRUPT(mp, i != 1)) {
> - error = -EFSCORRUPTED;
> - goto done;
> - }
> + return error;
> + if (XFS_IS_CORRUPT(mp, i != 1))
> + return -EFSCORRUPTED;
> }
>
> if (got.br_startoff == del->br_startoff)
> @@ -5093,17 +5091,15 @@ xfs_bmap_del_extent_real(
> xfs_iext_prev(ifp, icur);
> ifp->if_nextents--;
>
> - flags |= XFS_ILOG_CORE;
> + *logflagsp |= XFS_ILOG_CORE;
> if (!cur) {
> - flags |= xfs_ilog_fext(whichfork);
> + *logflagsp |= xfs_ilog_fext(whichfork);
> break;
> }
> if ((error = xfs_btree_delete(cur, &i)))
> - goto done;
> - if (XFS_IS_CORRUPT(mp, i != 1)) {
> - error = -EFSCORRUPTED;
> - goto done;
> - }
> + return error;
> + if (XFS_IS_CORRUPT(mp, i != 1))
> + return -EFSCORRUPTED;
> break;
> case BMAP_LEFT_FILLING:
> /*
> @@ -5114,12 +5110,12 @@ xfs_bmap_del_extent_real(
> got.br_blockcount -= del->br_blockcount;
> xfs_iext_update_extent(ip, state, icur, &got);
> if (!cur) {
> - flags |= xfs_ilog_fext(whichfork);
> + *logflagsp |= xfs_ilog_fext(whichfork);
> break;
> }
> error = xfs_bmbt_update(cur, &got);
> if (error)
> - goto done;
> + return error;
> break;
> case BMAP_RIGHT_FILLING:
> /*
> @@ -5128,12 +5124,12 @@ xfs_bmap_del_extent_real(
> got.br_blockcount -= del->br_blockcount;
> xfs_iext_update_extent(ip, state, icur, &got);
> if (!cur) {
> - flags |= xfs_ilog_fext(whichfork);
> + *logflagsp |= xfs_ilog_fext(whichfork);
> break;
> }
> error = xfs_bmbt_update(cur, &got);
> if (error)
> - goto done;
> + return error;
> break;
> case 0:
> /*
> @@ -5150,18 +5146,18 @@ xfs_bmap_del_extent_real(
> new.br_state = got.br_state;
> new.br_startblock = del_endblock;
>
> - flags |= XFS_ILOG_CORE;
> + *logflagsp |= XFS_ILOG_CORE;
> if (cur) {
> error = xfs_bmbt_update(cur, &got);
> if (error)
> - goto done;
> + return error;
> error = xfs_btree_increment(cur, 0, &i);
> if (error)
> - goto done;
> + return error;
> cur->bc_rec.b = new;
> error = xfs_btree_insert(cur, &i);
> if (error && error != -ENOSPC)
> - goto done;
> + return error;
> /*
> * If get no-space back from btree insert, it tried a
> * split, and we have a zero block reservation. Fix up
> @@ -5174,33 +5170,28 @@ xfs_bmap_del_extent_real(
> */
> error = xfs_bmbt_lookup_eq(cur, &got, &i);
> if (error)
> - goto done;
> - if (XFS_IS_CORRUPT(mp, i != 1)) {
> - error = -EFSCORRUPTED;
> - goto done;
> - }
> + return error;
> + if (XFS_IS_CORRUPT(mp, i != 1))
> + return -EFSCORRUPTED;
> /*
> * Update the btree record back
> * to the original value.
> */
> error = xfs_bmbt_update(cur, &old);
> if (error)
> - goto done;
> + return error;
> /*
> * Reset the extent record back
> * to the original value.
> */
> xfs_iext_update_extent(ip, state, icur, &old);
> - flags = 0;
> - error = -ENOSPC;
> - goto done;
> - }
> - if (XFS_IS_CORRUPT(mp, i != 1)) {
> - error = -EFSCORRUPTED;
> - goto done;
> + *logflagsp = 0;
> + return -ENOSPC;
> }
> + if (XFS_IS_CORRUPT(mp, i != 1))
> + return -EFSCORRUPTED;
> } else
> - flags |= xfs_ilog_fext(whichfork);
> + *logflagsp |= xfs_ilog_fext(whichfork);
>
> ifp->if_nextents++;
> xfs_iext_next(ifp, icur);
> @@ -5224,7 +5215,7 @@ xfs_bmap_del_extent_real(
> ((bflags & XFS_BMAPI_NODISCARD) ||
> del->br_state == XFS_EXT_UNWRITTEN));
> if (error)
> - goto done;
> + return error;
> }
> }
>
> @@ -5239,9 +5230,7 @@ xfs_bmap_del_extent_real(
> if (qfield && !(bflags & XFS_BMAPI_REMAP))
> xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
>
> -done:
> - *logflagsp = flags;
> - return error;
> + return 0;
> }
>
> /*
> --
> 2.20.1
>
>
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