From 5b8826ddfd1c4fcdcfe9f78fd80cfeeac9de1b21 Mon Sep 17 00:00:00 2001
From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Tue, 15 May 2012 11:30:39 +0200
Subject: Btrfs-progs: add command to get/reset device stats via ioctl

"btrfs device stats" is used to retrieve and print the device stats.
"btrfs device stats -z" is used to atomically retrieve, reset and
print the stats.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
---
 man/btrfs.8.in | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'man')

diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index d20e332e..460592eb 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -33,6 +33,8 @@ btrfs \- control a btrfs filesystem
 .PP
 \fBbtrfs\fP \fBdevice scan\fP\fI [--all-devices|<device> [<device>...]]\fP
 .PP
+\fBbtrfs\fP \fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
+.PP
 \fBbtrfs\fP \fBdevice add\fP\fI <device> [<device>...] <path> \fP
 .PP
 \fBbtrfs\fP \fBdevice delete\fP\fI <device> [<device>...] <path> \fP
@@ -252,6 +254,18 @@ Balance the chunks of the filesystem identified by \fI<path>\fR
 across the devices.
 .TP
 
+\fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
+Read and print the device IO stats for all devices of the filesystem
+identified by \fI<path>\fR or for a single \fI<device>\fR.
+
+.RS
+\fIOptions\fR
+.TP
+.B -z
+Reset stats to zero after reading them.
+.RE
+.TP
+
 \fBdevice add\fR\fI <dev> [<dev>..] <path>\fR
 Add device(s) to the filesystem identified by \fI<path>\fR.
 .TP
-- 
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