Josef Bacik
2012-Aug-02 14:25 UTC
[PATCH] Btrfs: do not use missing devices when showing devname
If you do the following
mkfs.btrfs /dev/sdb /dev/sdc
rmmod btrfs
dd if=/dev/zero of=/dev/sdb bs=1M count=1
mount -o degraded /dev/sdc /mnt/btrfs-test
the box will panic trying to deref the name for the missing dev since it is
the lower numbered devid. So fix show_devname to not use missing devices.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
fs/btrfs/super.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fa61ef5..ffcfe49 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1505,6 +1505,8 @@ static int btrfs_show_devname(struct seq_file *m, struct
dentry *root)
while (cur_devices) {
head = &cur_devices->devices;
list_for_each_entry(dev, head, dev_list) {
+ if (dev->missing)
+ continue;
if (!first_dev || dev->devid < first_dev->devid)
first_dev = dev;
}
--
1.7.7.6
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs"
in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html