diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-09-17 21:06:37 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-09-20 06:19:58 (GMT) |
| commit | c32b1ec8a266476494f04843434538cdb25d9190 (patch) | |
| tree | c22f5e813f7d35fbf2234d0f3b76b25a7de6d4bf | |
| parent | a6247b0189fab0edbe065ab42e76eddb2a03a631 (diff) | |
| download | linux-c32b1ec8a266476494f04843434538cdb25d9190.tar.xz | |
xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write
commit 4c1a67bd3606540b9b42caff34a1d5cd94b1cf65 upstream.
We must initialize the firstfsb parameter to _bmapi_write so that it
doesn't incorrectly treat stack garbage as a restriction on which AGs
it can search for free space.
Fixes-coverity-id: 1402025
Fixes-coverity-id: 1415167
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 9 | ||||
| -rw-r--r-- | fs/xfs/xfs_reflink.c | 2 |
2 files changed, 10 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index b79719a..73571fb 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -6639,6 +6639,15 @@ xfs_bmap_finish_one( bmap.br_blockcount = *blockcount; bmap.br_state = state; + /* + * firstfsb is tied to the transaction lifetime and is used to + * ensure correct AG locking order and schedule work item + * continuations. XFS_BUI_MAX_FAST_EXTENTS (== 1) restricts us + * to only making one bmap call per transaction, so it should + * be safe to have it as a local variable here. + */ + firstfsb = NULLFSBLOCK; + trace_xfs_bmap_deferred(tp->t_mountp, XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type, XFS_FSB_TO_AGBNO(tp->t_mountp, startblock), diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 29a75ec..350fc64 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -333,7 +333,7 @@ xfs_reflink_convert_cow_extent( struct xfs_defer_ops *dfops) { struct xfs_bmbt_irec irec = *imap; - xfs_fsblock_t first_block; + xfs_fsblock_t first_block = NULLFSBLOCK; int nimaps = 1; if (imap->br_state == XFS_EXT_NORM) |