[PATCH 3/9 v2] btrfs-progs: update device scan usage

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the btrfs device scan usage does not publish --all-devices
option so add it

Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
 cmds-device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmds-device.c b/cmds-device.c
index 41e79d3..d25159b 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -178,7 +178,7 @@ static int cmd_rm_dev(int argc, char **argv)
 }
 
 static const char * const cmd_scan_dev_usage[] = {
-	"btrfs device scan [<device>...]",
+	"btrfs device scan [<--all-devices>|<device> [<device>...]]",
 	"Scan devices for a btrfs filesystem",
 	NULL
 };
-- 
1.8.1.227.g44fe835

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