Support messages to:
- change the size of the stripe cache
- change the speed limiter on resync.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/dm-raid456.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/drivers/md/dm-raid456.c b/drivers/md/dm-raid456.c
index e2546fc..a2567b0 100644
--- a/drivers/md/dm-raid456.c
+++ b/drivers/md/dm-raid456.c
@@ -485,6 +485,31 @@ static void raid_resume(struct dm_target *ti)
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 = "raid45",
.version = {1, 0, 0},
@@ -498,6 +523,7 @@ 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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