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btrfs-progs doc: emphasis that only mounted device works for btrfs device stats

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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>
This commit is contained in:
Chen Hanxiao 2015-04-01 03:52:57 -04:00 committed by David Sterba
parent 6f0a14303f
commit 153bbb93ec
1 changed files with 3 additions and 3 deletions
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Documentation/btrfs-device.txt
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@ -90,7 +90,7 @@ Finally, if '--all-devices' or '-d' is passed, all the devices under /dev are
scanned.
*stats* [-z] <path>|<device>::
Read and print the device IO stats for all devices of the filesystem
Read and print the device IO stats for all mounted devices of the filesystem
identified by <path> or for a single <device>.
+
`Options`