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>

5 files changed, 20 insertions, 8 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index eee522c56ef..d3421282244 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();
 }
 
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d5ccd467a1d..79eba5a15e8 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1070,5 +1070,6 @@ GLOBAL_EXTERN spinlock_t gidsidlock;
 void cifs_oplock_break(struct work_struct *work);
 
 extern const struct slow_work_ops cifs_oplock_break_ops;
+extern struct workqueue_struct *cifsiod_wq;
 
 #endif  /* _CIFS_GLOB_H */
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index f0b1c59a3bb..76d8981736e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1689,7 +1689,7 @@ cifs_readv_callback(struct mid_q_entry *mid)
                 rdata->result = -EIO;
         }
 
-        queue_work(system_nrt_wq, &rdata->work);
+        queue_work(cifsiod_wq, &rdata->work);
         DeleteMidQEntry(mid);
         cifs_add_credits(server, 1);
 }
@@ -2129,7 +2129,7 @@ cifs_writev_callback(struct mid_q_entry *mid)
                 break;
         }
 
-        queue_work(system_nrt_wq, &wdata->work);
+        queue_work(cifsiod_wq, &wdata->work);
         DeleteMidQEntry(mid);
         cifs_add_credits(tcon->ses->server, 1);
 }
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index f3c932910b6..855d8c08e3a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -335,7 +335,7 @@ cifs_echo_request(struct work_struct *work)
                         server->hostname);
 
 requeue_echo:
-        queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
+        queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
 }
 
 static bool
@@ -1971,7 +1971,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
         cifs_fscache_get_client_cookie(tcp_ses);
 
         /* queue echo request delayed work */
-        queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
+        queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
 
         return tcp_ses;
 
@@ -3537,7 +3537,7 @@ remote_path_check:
         tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
         spin_unlock(&cifs_sb->tlink_tree_lock);
 
-        queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
+        queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
                                 TLINK_IDLE_EXPIRE);
 
 mount_fail_check:
@@ -4091,6 +4091,6 @@ cifs_prune_tlinks(struct work_struct *work)
         }
         spin_unlock(&cifs_sb->tlink_tree_lock);
 
-        queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
+        queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
                                 TLINK_IDLE_EXPIRE);
 }
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 425e4f2a155..c29d1aa2c54 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -595,7 +595,7 @@ is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
 
                                 cifs_set_oplock_level(pCifsInode,
                                         pSMB->OplockLevel ? OPLOCK_READ : 0);
-                                queue_work(system_nrt_wq,
+                                queue_work(cifsiod_wq,
                                            &netfile->oplock_break);
                                 netfile->oplock_break_cancelled = false;