Add MUTEX_FSTRANS mutex type

There are regions in the ZFS code where it is desirable to be able
to be set PF_FSTRANS while a specific mutex is held.  The ZFS code
could be updated to set/clear this flag in all the correct places,
but this is undesirable for a few reasons.

1) It would require changes to a significant amount of the ZFS
   code.  This would complicate applying patches from upstream.

2) It would be easy to accidentally miss a critical region in
   the initial patch or to have an future change introduce a
   new one.

Both of these concerns can be addressed by adding a new mutex type
which is responsible for managing PF_FSTRANS, support for which was
added to the SPL in commit 9099312 - Merge branch 'kmem-rework'.

Signed-off-by: Brian Behlendorf <[email protected]>
Signed-off-by: Tim Chase <[email protected]>
Issue #435

1 files changed, 1 insertions, 1 deletions

diff --git a/module/splat/splat-atomic.c b/module/splat/splat-atomic.c
index a270dc42f..e94f42f00 100644
--- a/module/splat/splat-atomic.c
+++ b/module/splat/splat-atomic.c
@@ -145,7 +145,7 @@ splat_atomic_test1(struct file *file, void *arg)
 
 	ap.ap_magic = SPLAT_ATOMIC_TEST_MAGIC;
 	ap.ap_file = file;
-	mutex_init(&ap.ap_lock, SPLAT_ATOMIC_TEST1_NAME, NULL, NULL);
+	mutex_init(&ap.ap_lock, SPLAT_ATOMIC_TEST1_NAME, MUTEX_DEFAULT, NULL);
 	init_waitqueue_head(&ap.ap_waitq);
 	ap.ap_atomic = SPLAT_ATOMIC_INIT_VALUE;
 	ap.ap_atomic_exited = 0;