btrfs: factor btrfs_init_scrub() out of open_ctree()

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
[renamed to btrfs_init_scrub]
Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6f37d9f..2936a39 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2147,6 +2147,17 @@
 	}
 }
 
+static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
+{
+	mutex_init(&fs_info->scrub_lock);
+	atomic_set(&fs_info->scrubs_running, 0);
+	atomic_set(&fs_info->scrub_pause_req, 0);
+	atomic_set(&fs_info->scrubs_paused, 0);
+	atomic_set(&fs_info->scrub_cancel_req, 0);
+	init_waitqueue_head(&fs_info->scrub_pause_wait);
+	fs_info->scrub_workers_refcnt = 0;
+}
+
 int open_ctree(struct super_block *sb,
 	       struct btrfs_fs_devices *fs_devices,
 	       char *options)
@@ -2295,14 +2306,8 @@
 	}
 	btrfs_init_delayed_root(fs_info->delayed_root);
 
-	mutex_init(&fs_info->scrub_lock);
-	atomic_set(&fs_info->scrubs_running, 0);
-	atomic_set(&fs_info->scrub_pause_req, 0);
-	atomic_set(&fs_info->scrubs_paused, 0);
-	atomic_set(&fs_info->scrub_cancel_req, 0);
+	btrfs_init_scrub(fs_info);
 	init_waitqueue_head(&fs_info->replace_wait);
-	init_waitqueue_head(&fs_info->scrub_pause_wait);
-	fs_info->scrub_workers_refcnt = 0;
 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
 	fs_info->check_integrity_print_mask = 0;
 #endif