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authorNeilBrown <neilb@suse.de>2006-10-03 01:15:53 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-03 08:04:18 -0700
commit26be34dc3a46be983352dd89683db374b0cb73fa (patch)
tree296ed9d019ac56d4a6ea0909f1cf11bdfd08a3e5 /drivers/md/raid0.c
parentc04be0aa82ff535e3676ab3e573957bdeef41879 (diff)
downloadop-kernel-dev-26be34dc3a46be983352dd89683db374b0cb73fa.zip
op-kernel-dev-26be34dc3a46be983352dd89683db374b0cb73fa.tar.gz
[PATCH] md: define backing_dev_info.congested_fn for raid0 and linear
Each backing_dev needs to be able to report whether it is congested, either by modulating BDI_*_congested in ->state, or by defining a ->congested_fn. md/raid did neither of these. This patch add a congested_fn which simply checks all component devices to see if they are congested. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/raid0.c')
-rw-r--r--drivers/md/raid0.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index cb8c631..dfe3214 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -60,6 +60,21 @@ static int raid0_issue_flush(request_queue_t *q, struct gendisk *disk,
return ret;
}
+static int raid0_congested(void *data, int bits)
+{
+ mddev_t *mddev = data;
+ raid0_conf_t *conf = mddev_to_conf(mddev);
+ mdk_rdev_t **devlist = conf->strip_zone[0].dev;
+ int i, ret = 0;
+
+ for (i = 0; i < mddev->raid_disks && !ret ; i++) {
+ request_queue_t *q = bdev_get_queue(devlist[i]->bdev);
+
+ ret |= bdi_congested(&q->backing_dev_info, bits);
+ }
+ return ret;
+}
+
static int create_strip_zones (mddev_t *mddev)
{
@@ -236,6 +251,8 @@ static int create_strip_zones (mddev_t *mddev)
mddev->queue->unplug_fn = raid0_unplug;
mddev->queue->issue_flush_fn = raid0_issue_flush;
+ mddev->queue->backing_dev_info.congested_fn = raid0_congested;
+ mddev->queue->backing_dev_info.congested_data = mddev;
printk("raid0: done.\n");
return 0;
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