Commit 26be34dc authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds

[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: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c04be0aa
...@@ -111,6 +111,19 @@ static int linear_issue_flush(request_queue_t *q, struct gendisk *disk, ...@@ -111,6 +111,19 @@ static int linear_issue_flush(request_queue_t *q, struct gendisk *disk,
return ret; return ret;
} }
static int linear_congested(void *data, int bits)
{
mddev_t *mddev = data;
linear_conf_t *conf = mddev_to_conf(mddev);
int i, ret = 0;
for (i = 0; i < mddev->raid_disks && !ret ; i++) {
request_queue_t *q = bdev_get_queue(conf->disks[i].rdev->bdev);
ret |= bdi_congested(&q->backing_dev_info, bits);
}
return ret;
}
static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks) static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
{ {
linear_conf_t *conf; linear_conf_t *conf;
...@@ -269,6 +282,8 @@ static int linear_run (mddev_t *mddev) ...@@ -269,6 +282,8 @@ static int linear_run (mddev_t *mddev)
blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec); blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
mddev->queue->unplug_fn = linear_unplug; mddev->queue->unplug_fn = linear_unplug;
mddev->queue->issue_flush_fn = linear_issue_flush; mddev->queue->issue_flush_fn = linear_issue_flush;
mddev->queue->backing_dev_info.congested_fn = linear_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
return 0; return 0;
} }
......
...@@ -60,6 +60,21 @@ static int raid0_issue_flush(request_queue_t *q, struct gendisk *disk, ...@@ -60,6 +60,21 @@ static int raid0_issue_flush(request_queue_t *q, struct gendisk *disk,
return ret; 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) static int create_strip_zones (mddev_t *mddev)
{ {
...@@ -236,6 +251,8 @@ 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->unplug_fn = raid0_unplug;
mddev->queue->issue_flush_fn = raid0_issue_flush; 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"); printk("raid0: done.\n");
return 0; return 0;
......
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