Add ioctl to control resync speed, userspace tool
is dmsetup message, message format is:
dmsetup message $device 0 "set-max-resync-speed $speed"
e.g.
dmsetup message /dev/dm-2 "set-max-resync-speed 12345"
Signed-off-by: Guangliang Zhao <gz...@suse.com>
---
drivers/md/dm-raid1.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 43e428a..3cdad37 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1361,6 +1361,49 @@ static void mirror_resume(struct dm_target *ti)
}
/*
+ * convert speed into members of ratelimit_state
+ */
+static void speed_to_rlimit(struct mirror_set *ms, struct ratelimit_state *rl,
+ unsigned int speed)
+{
+ sector_t region_size = dm_rh_get_region_size(ms->rh);
+
+ rl->interval = RESYNC_JIFFIES;
+ rl->burst = (speed * (RESYNC_JIFFIES / HZ)) << 1;
+ rl->burst = DIV_ROUND_UP(rl->burst, region_size);
+}
+
+/*
+ * Message interface
+ * set-max-resync-speed $speed(KB/s)
+ */
+static int mirror_message(struct dm_target *ti, unsigned argc, char **argv)
+{
+ struct mirror_set *ms = ti->private;
+ unsigned int speed;
+ int ret = 0;
+
+ if (!strcasecmp(argv[0], "set-max-resync-speed")) {
+ if (sscanf(argv[1], "%u", &speed) != 1) {
+ DMWARN("invalid speed parameter %s", argv[1]);
+ ret = -EINVAL;
+ goto error;
+ }
+
+ speed_to_rlimit(ms, &ms->ms_rlimit, speed);
+ goto out;
+ } else {
+ ret = -EINVAL;
+ goto error;
+ }
+
+error:
+ DMWARN("unrecognised message received.");
+out:
+ return ret;
+}
+
+/*
* device_status_char
* @m: mirror device/leg we want the status of
*
@@ -1450,6 +1493,7 @@ static struct target_type mirror_target = {
.presuspend = mirror_presuspend,
.postsuspend = mirror_postsuspend,
.resume = mirror_resume,
+ .message = mirror_message,
.status = mirror_status,
.iterate_devices = mirror_iterate_devices,
};
--
1.7.10.4
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