diff options
| author | Dave Chinner <dchinner@redhat.com> | 2018-05-09 07:47:34 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-05-10 08:56:41 -0700 |
| commit | 22525c17ed133202088f6f05acd9c53790a7121d (patch) | |
| tree | 1447ecb5ace55b30f6ed03cf47f7121cce42418f /fs/xfs/xfs_refcount_item.c | |
| parent | 52101dfe56f71d8cb140c2440d95affa25a53746 (diff) | |
| download | lwn-22525c17ed133202088f6f05acd9c53790a7121d.tar.gz lwn-22525c17ed133202088f6f05acd9c53790a7121d.zip | |
xfs: log item flags are racy
The log item flags contain a field that is protected by the AIL
lock - the XFS_LI_IN_AIL flag. We use non-atomic RMW operations to
set and clear these flags, but most of the updates and checks are
not done with the AIL lock held and so are susceptible to update
races.
Fix this by changing the log item flags to use atomic bitops rather
than be reliant on the AIL lock for update serialisation.
Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_refcount_item.c')
| -rw-r--r-- | fs/xfs/xfs_refcount_item.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c index 15c9393dd7a7..e5866b714d5f 100644 --- a/fs/xfs/xfs_refcount_item.c +++ b/fs/xfs/xfs_refcount_item.c @@ -159,7 +159,7 @@ STATIC void xfs_cui_item_unlock( struct xfs_log_item *lip) { - if (lip->li_flags & XFS_LI_ABORTED) + if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) xfs_cui_release(CUI_ITEM(lip)); } @@ -310,7 +310,7 @@ xfs_cud_item_unlock( { struct xfs_cud_log_item *cudp = CUD_ITEM(lip); - if (lip->li_flags & XFS_LI_ABORTED) { + if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) { xfs_cui_release(cudp->cud_cuip); kmem_zone_free(xfs_cud_zone, cudp); } |