btrfs-progs: dev usage, update manpage

Signed-off-by: David Sterba <dsterba@suse.cz>

diff --git a/Documentation/btrfs-device.txt b/Documentation/btrfs-device.txt
index 46c54b9..4cd633f 100644 (file)
--- a/Documentation/btrfs-device.txt
+++ b/Documentation/btrfs-device.txt
@@ -98,6 +98,32 @@ identified by <path> or for a single <device>.
 -z::::
 Reset stats to zero after reading them.
 
+*usage* [options] <path> [<path>...]::
+Show detailed information about internal allocations in devices.
++
+`Options`
++
+-b|--raw::::
+raw numbers in bytes, without the 'B' suffix
+-h::::
+print human friendly numbers, base 1024, this is the default
+-H::::
+print human friendly numbers, base 1000
+--iec::::
+select the 1024 base for the following options, according to the IEC standard
+--si::::
+select the 1000 base for the following options, according to the SI standard
+-k|--kbytes::::
+show sizes in KiB, or kB with --si
+-m|--mbytes::::
+show sizes in MiB, or MB with --si
+-g|--gbytes::::
+show sizes in GiB, or GB with --si
+-t|--tbytes::::
+show sizes in TiB, or TB with --si
+
+If conflicting options are passed, the last one takes precedence.
+
 EXIT STATUS
 -----------
 *btrfs device* returns a zero exit status if it succeeds. Non zero is