[PATCH] md: add a ->congested_fn function for raid5/6

This is very different from other raid levels and all requests go through a
'stripe cache', and it has congestion management already.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 6cea9c9a98e2..37e4ff661b6c 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2593,6 +2593,24 @@ static int raid5_issue_flush(request_queue_t *q, struct gendisk *disk,
         return ret;
 }
 
+static int raid5_congested(void *data, int bits)
+{
+        mddev_t *mddev = data;
+        raid5_conf_t *conf = mddev_to_conf(mddev);
+
+        /* No difference between reads and writes.  Just check
+         * how busy the stripe_cache is
+         */
+        if (conf->inactive_blocked)
+                return 1;
+        if (conf->quiesce)
+                return 1;
+        if (list_empty_careful(&conf->inactive_list))
+                return 1;
+
+        return 0;
+}
+
 static int make_request(request_queue_t *q, struct bio * bi)
 {
         mddev_t *mddev = q->queuedata;
@@ -3296,6 +3314,9 @@ static int run(mddev_t *mddev)
 
         mddev->queue->unplug_fn = raid5_unplug_device;
         mddev->queue->issue_flush_fn = raid5_issue_flush;
+        mddev->queue->backing_dev_info.congested_fn = raid5_congested;
+        mddev->queue->backing_dev_info.congested_data = mddev;
+
         mddev->array_size =  mddev->size * (conf->previous_raid_disks -
                                             conf->max_degraded);