ceph: fsc->*_wq's aren't used in memory reclaim path

fsc->*_wq's aren't depended upon during memory reclaim.  Convert to
alloc_workqueue() w/o WQ_MEM_RECLAIM.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Sage Weil <sage@newdream.net>
Cc: ceph-devel@vger.kernel.org
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 1417f3f3e246..bf6f0f34082a 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -444,13 +444,17 @@ struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
                 goto fail_client;
 
         err = -ENOMEM;
-        fsc->wb_wq = create_workqueue("ceph-writeback");
+        /*
+         * The number of concurrent works can be high but they don't need
+         * to be processed in parallel, limit concurrency.
+         */
+        fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1);
         if (fsc->wb_wq == NULL)
                 goto fail_bdi;
-        fsc->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid");
+        fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1);
         if (fsc->pg_inv_wq == NULL)
                 goto fail_wb_wq;
-        fsc->trunc_wq = create_singlethread_workqueue("ceph-trunc");
+        fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1);
         if (fsc->trunc_wq == NULL)
                 goto fail_pg_inv_wq;