diff options
| -rw-r--r-- | Documentation/btrfs-device.asciidoc | 5 | ||||
| -rw-r--r-- | cmds-device.c | 6 |
2 files changed, 7 insertions, 4 deletions
diff --git a/Documentation/btrfs-device.asciidoc b/Documentation/btrfs-device.asciidoc index 193e2734..1e3b3a39 100644 --- a/Documentation/btrfs-device.asciidoc +++ b/Documentation/btrfs-device.asciidoc @@ -100,8 +100,9 @@ prior scanning. See the mount option 'device'. *stats* [-zs] <path>|<device>:: Read and print the device IO error statistics for all devices of the given -filesystem identified by <path> or for a single <device>. See section *DEVICE -STATS* for more information. +filesystem identified by <path> or for a single <device>. The filesystem must +be mounted. See section *DEVICE STATS* for more information about the reported +statistics and the meaning. + `Options` + diff --git a/cmds-device.c b/cmds-device.c index ba0e4368..3e053d9e 100644 --- a/cmds-device.c +++ b/cmds-device.c @@ -372,8 +372,10 @@ out: } static const char * const cmd_device_stats_usage[] = { - "btrfs device stats [-z] <path>|<device>", - "Show current device IO stats.", + "btrfs device stats [options] <path>|<device>", + "Show device IO error statistics", + "Show device IO error statistics for all devices of the given filesystem", + "identified by PATH or DEVICE. The filesystem must be mounted.", "", "-z|--reset show current stats and reset values to zero", "-s return non-zero if any stat counter is not zero", |