btrfs: Enhance message when a device is missing during mount
For a missing device, btrfs will just refuse to mount with almost meaningless kernel message like: BTRFS info (device vdb6): disk space caching is enabled BTRFS info (device vdb6): has skinny extents BTRFS error (device vdb6): failed to read the system array: -5 BTRFS error (device vdb6): open_ctree failed This patch will print a new message about the missing device: BTRFS info (device vdb6): disk space caching is enabled BTRFS info (device vdb6): has skinny extents BTRFS warning (device vdb6): devid 2 uuid 80470722-cad2-4b90-b7c3-fee294552f1b is missing BTRFS error (device vdb6): failed to read the system array: -5 BTRFS error (device vdb6): open_ctree failed Signed-off-by: NQu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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