From 99f5944b8477914406173b47b4f261356286730b Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@fusionio.com>
Date: Thu, 2 Aug 2012 10:23:59 -0400
Subject: [PATCH] Btrfs: do not strdup non existent strings
When we close devices we add back empty devices for some reason that escapes
me. In the case of a missing dev we don't allocate an rcu_string for it's
name, so check to see if the device has a name and if it doesn't don't
bother strdup()'ing it. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
fs/btrfs/volumes.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b8708f994e679..3b394503bd4e7 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -569,9 +569,11 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
memcpy(new_device, device, sizeof(*new_device));
/* Safe because we are under uuid_mutex */
- name = rcu_string_strdup(device->name->str, GFP_NOFS);
- BUG_ON(device->name && !name); /* -ENOMEM */
- rcu_assign_pointer(new_device->name, name);
+ if (device->name) {
+ name = rcu_string_strdup(device->name->str, GFP_NOFS);
+ BUG_ON(device->name && !name); /* -ENOMEM */
+ rcu_assign_pointer(new_device->name, name);
+ }
new_device->bdev = NULL;
new_device->writeable = 0;
new_device->in_fs_metadata = 0;
--
2.30.2