Merge tag 'gpio-v3.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 340a92d08e84d9e5268a18fe5f3112465fa47888..2c2d6d1d8eee929fc910a82cd17fbec79803cbb2 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -529,12 +529,12 @@ static noinline int device_list_add(const char *path,
                 */
 
                /*
-                * As of now don't allow update to btrfs_fs_device through
-                * the btrfs dev scan cli, after FS has been mounted.
+                * For now, we do allow update to btrfs_fs_device through the
+                * btrfs dev scan cli after FS has been mounted.  We're still
+                * tracking a problem where systems fail mount by subvolume id
+                * when we reject replacement on a mounted FS.
                 */
-               if (fs_devices->opened) {
-                       return -EBUSY;
-               } else {
+               if (!fs_devices->opened && found_transid < device->generation) {
                        /*
                         * That is if the FS is _not_ mounted and if you
                         * are here, that means there is more than one
@@ -542,8 +542,7 @@ static noinline int device_list_add(const char *path,
                         * with larger generation number or the last-in if
                         * generation are equal.
                         */
-                       if (found_transid < device->generation)
-                               return -EEXIST;
+                       return -EEXIST;
                }
 
                name = rcu_string_strdup(path, GFP_NOFS);