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Use MUTEX_FSTRANS on l2arc_buflist_mtx

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Use MUTEX_FSTRANS on l2arc_buflist_mtx to prevent the following deadlock
scenario:
1. arc_release() -> hash_lock -> l2arc_buflist_mtx
2. l2arc_write_buffers() -> l2arc_buflist_mtx -> (direct reclaim) ->
   arc_buf_remove_ref() -> hash_lock

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Signed-off-by: Tim Chase <tim@chase2k.com>
Issue #3160
This commit is contained in:
Chunwei Chen 2015-03-16 23:54:57 -07:00 committed by Brian Behlendorf
parent a1d3450e94
commit 40749aa7a6
1 changed files with 1 additions and 1 deletions
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2
module/zfs/arc.c
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@ -5530,7 +5530,7 @@ l2arc_init(void)
mutex_init(&l2arc_feed_thr_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&l2arc_feed_thr_lock, NULL, MUTEX_DEFAULT, NULL);
cv_init(&l2arc_feed_thr_cv, NULL, CV_DEFAULT, NULL); cv_init(&l2arc_feed_thr_cv, NULL, CV_DEFAULT, NULL);
mutex_init(&l2arc_dev_mtx, NULL, MUTEX_DEFAULT, NULL); mutex_init(&l2arc_dev_mtx, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&l2arc_buflist_mtx, NULL, MUTEX_DEFAULT, NULL); mutex_init(&l2arc_buflist_mtx, NULL, MUTEX_FSTRANS, NULL);
mutex_init(&l2arc_free_on_write_mtx, NULL, MUTEX_DEFAULT, NULL); mutex_init(&l2arc_free_on_write_mtx, NULL, MUTEX_DEFAULT, NULL);
l2arc_dev_list = &L2ARC_dev_list; l2arc_dev_list = &L2ARC_dev_list;