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由 Stefan Behrens 提交于
When a filesystem is mounted with the degraded option, it is possible that some of the devices are not there. btrfs_ioctl_dev_info() crashs in this case because the device name is a NULL pointer. This ioctl was only used for scrub. Signed-off-by: NStefan Behrens <sbehrens@giantdisaster.de>
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