btrfs-progs: "device ready" accepts just one device
* actual result
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# ./btrfs device ready /dev/sdb foo
#
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* expecting result
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# ./btrfs device ready /dev/sdb foo
btrfs device ready: too many arguments
usage: btrfs device ready <device>
Check device to see if it has all of its devices in cache for mounting
#
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Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>