Patch name: dm-raid-message-fn.patch
Addition of the .message function to provide the
ability to:
- change the size of the stripe cache
- change the speed limiter on resync.
<JB> Would it make sense to provide a way to set these
via the CTR also?
Signed-off-by: NeilBrown <neilb@xxxxxxx>
RFC-by: Jonathan Brassow <jbrassow@xxxxxxxxxx>
Index: linux-2.6/drivers/md/dm-raid.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-raid.c
+++ linux-2.6/drivers/md/dm-raid.c
@@ -504,6 +504,31 @@ static void raid_resume(struct dm_target
mddev_resume(&rs->md);
}
+/* Parse and handle a message from userspace
+ * Messages are:
+ * stripecache N (pages per devices)
+ * minspeed N (kibibytes per seconds)
+ */
+static int raid_message(struct dm_target *ti, unsigned argc, char **argv)
+{
+ struct raid_set *rs = ti->private;
+
+ if (argc == 2 && strcmp(argv[0], "stripecache") == 0) {
+ unsigned long size;
+ if (strict_strtoul(argv[1], 10, &size))
+ return -EINVAL;
+ return raid5_set_cache_size(&rs->md, size);
+ }
+ if (argc == 2 && strcmp(argv[0], "minspeed") == 0) {
+ unsigned long speed;
+ if (strict_strtoul(argv[1], 10, &speed))
+ return -EINVAL;
+ rs->md.sync_speed_min = speed;
+ return 0;
+ }
+ return -EINVAL;
+}
+
static struct target_type raid_target = {
.name = "raid",
.version = {1, 0, 0},
@@ -517,6 +542,7 @@ static struct target_type raid_target =
.presuspend = raid_presuspend,
.postsuspend = raid_postsuspend,
.resume = raid_resume,
+ .message = raid_message,
};
static int __init dm_raid_init(void)
--
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