Commit aa9ddcd4 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
Browse files

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.
Signed-off-by: default avatarJosef Bacik <>
parent 3627bf45
......@@ -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)
if (!first_dev || dev->devid < first_dev->devid)
first_dev = dev;
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