SLOW_WORK: Wait for outstanding work items belonging to a module to clear

Wait for outstanding slow work items belonging to a module to clear when
unregistering that module as a user of the facility.  This prevents the put_ref
code of a work item from being taken away before it returns.

Signed-off-by: David Howells <dhowells@redhat.com>

5 files changed, 8 insertions, 5 deletions

diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index 4de41b59749..add6bdb53f0 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -48,7 +48,7 @@ static int __init fscache_init(void)
 {
 	int ret;
 
-	ret = slow_work_register_user();
+	ret = slow_work_register_user(THIS_MODULE);
 	if (ret < 0)
 		goto error_slow_work;
 
@@ -80,7 +80,7 @@ error_kobj:
 error_cookie_jar:
 	fscache_proc_cleanup();
 error_proc:
-	slow_work_unregister_user();
+	slow_work_unregister_user(THIS_MODULE);
 error_slow_work:
 	return ret;
 }
@@ -97,7 +97,7 @@ static void __exit fscache_exit(void)
 	kobject_put(fscache_root);
 	kmem_cache_destroy(fscache_cookie_jar);
 	fscache_proc_cleanup();
-	slow_work_unregister_user();
+	slow_work_unregister_user(THIS_MODULE);
 	printk(KERN_NOTICE "FS-Cache: Unloaded\n");
 }
 
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index 392a41b1b79..d236eb1d6f3 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -45,6 +45,7 @@ static void fscache_enqueue_dependents(struct fscache_object *);
 static void fscache_dequeue_object(struct fscache_object *);
 
 const struct slow_work_ops fscache_object_slow_work_ops = {
+	.owner		= THIS_MODULE,
 	.get_ref	= fscache_object_slow_work_get_ref,
 	.put_ref	= fscache_object_slow_work_put_ref,
 	.execute	= fscache_object_slow_work_execute,
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index e7f8d53b8b6..f1a2857b2ff 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -453,6 +453,7 @@ static void fscache_op_execute(struct slow_work *work)
 }
 
 const struct slow_work_ops fscache_op_slow_work_ops = {
+	.owner		= THIS_MODULE,
 	.get_ref	= fscache_op_get_ref,
 	.put_ref	= fscache_op_put_ref,
 	.execute	= fscache_op_execute,
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index eacd78a5d08..5b31f7741a8 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -114,7 +114,7 @@ static int __init init_gfs2_fs(void)
 	if (error)
 		goto fail_unregister;
 
-	error = slow_work_register_user();
+	error = slow_work_register_user(THIS_MODULE);
 	if (error)
 		goto fail_slow;
 
@@ -163,7 +163,7 @@ static void __exit exit_gfs2_fs(void)
 	gfs2_unregister_debugfs();
 	unregister_filesystem(&gfs2_fs_type);
 	unregister_filesystem(&gfs2meta_fs_type);
-	slow_work_unregister_user();
+	slow_work_unregister_user(THIS_MODULE);
 
 	kmem_cache_destroy(gfs2_quotad_cachep);
 	kmem_cache_destroy(gfs2_rgrpd_cachep);
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 59d2695509d..b2bb779f09e 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -593,6 +593,7 @@ fail:
 }
 
 struct slow_work_ops gfs2_recover_ops = {
+	.owner	 = THIS_MODULE,
 	.get_ref = gfs2_recover_get_ref,
 	.put_ref = gfs2_recover_put_ref,
 	.execute = gfs2_recover_work,