cifs: add new cifsiod_wq workqueue

...and convert existing cifs users of system_nrt_wq to use that instead.

Also, make it freezable, and set WQ_MEM_RECLAIM since we use it to
deal with write reply handling.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index eee522c56ef0..d34212822444 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -85,6 +85,8 @@ extern mempool_t *cifs_sm_req_poolp;
 extern mempool_t *cifs_req_poolp;
 extern mempool_t *cifs_mid_poolp;
 
+struct workqueue_struct *cifsiod_wq;
+
 static int
 cifs_read_super(struct super_block *sb)
 {
@@ -1111,9 +1113,15 @@ init_cifs(void)
                 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
         }
 
+        cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+        if (!cifsiod_wq) {
+                rc = -ENOMEM;
+                goto out_clean_proc;
+        }
+
         rc = cifs_fscache_register();
         if (rc)
-                goto out_clean_proc;
+                goto out_destroy_wq;
 
         rc = cifs_init_inodecache();
         if (rc)
@@ -1161,6 +1169,8 @@ out_destroy_inodecache:
         cifs_destroy_inodecache();
 out_unreg_fscache:
         cifs_fscache_unregister();
+out_destroy_wq:
+        destroy_workqueue(cifsiod_wq);
 out_clean_proc:
         cifs_proc_clean();
         return rc;
@@ -1183,6 +1193,7 @@ exit_cifs(void)
         cifs_destroy_mids();
         cifs_destroy_inodecache();
         cifs_fscache_unregister();
+        destroy_workqueue(cifsiod_wq);
         cifs_proc_clean();
 }