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>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 75ee2c7791f0917ac605b8fc0004997c97b96ebb..2e06f124f28494502c981380de1aa0ba4c144fdf 100644 (file)
--- 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;
                }