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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-07-18 00:30:51 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-07-21 00:42:33 +0300 |
| commit | 4c1a67bd3606540b9b42caff34a1d5cd94b1cf65 (patch) | |
| tree | eedada57f2b1bdaf17f7604208f44ef4ce979926 /fs/xfs/libxfs | |
| parent | 1e86eabe73b73c82e1110c746ed3ec6d5e1c0a0d (diff) | |
| download | linux-4c1a67bd3606540b9b42caff34a1d5cd94b1cf65.tar.xz | |
xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write
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>
Diffstat (limited to 'fs/xfs/libxfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 0a9880777c9c..ee118ceb702f 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -6499,6 +6499,15 @@ xfs_bmap_finish_one( xfs_fsblock_t firstfsb; int error = 0; + /* + * 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), |