btrfs-progs doc: emphasis that only mounted device works for btrfs device stats
authorChen Hanxiao <chenhanxiao@cn.fujitsu.com>
Wed, 1 Apr 2015 07:52:57 +0000 (03:52 -0400)
committerDavid Sterba <dsterba@suse.cz>
Thu, 2 Apr 2015 15:26:35 +0000 (17:26 +0200)
commit153bbb93ec7de97ad9d2c8dd1bc5d2141623f17a
tree21876faafe9234aac8c498604287000a9782b0c5
parent6f0a14303fec3bf9f670eaf07e73a28e566a0855
btrfs-progs doc: emphasis that only mounted device works for btrfs device stats

We provided format <path>|<device> in command line.
But btrfs device stats doesn't work if device is not mounted.

Also fix some tailing whitespace.

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Documentation/btrfs-device.txt