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Subject[PATCH 003 of 4] 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>

### Diffstat output
./drivers/md/raid5.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff .prev/drivers/md/raid5.c ./drivers/md/raid5.c
--- .prev/drivers/md/raid5.c 2006-08-29 14:57:09.000000000 +1000
+++ ./drivers/md/raid5.c 2006-08-29 14:57:05.000000000 +1000
@@ -2593,6 +2593,24 @@ static int raid5_issue_flush(request_que
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);

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