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| author | NeilBrown <neilb@suse.de> | 2006-10-03 01:15:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-03 08:04:18 -0700 |
| commit | 26be34dc3a46be983352dd89683db374b0cb73fa (patch) | |
| tree | 296ed9d019ac56d4a6ea0909f1cf11bdfd08a3e5 /drivers/md/linear.c | |
| parent | c04be0aa82ff535e3676ab3e573957bdeef41879 (diff) | |
| download | linux-26be34dc3a46be983352dd89683db374b0cb73fa.tar.gz linux-26be34dc3a46be983352dd89683db374b0cb73fa.tar.bz2 linux-26be34dc3a46be983352dd89683db374b0cb73fa.zip | |
[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/linear.c')
| -rw-r--r-- | drivers/md/linear.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/md/linear.c b/drivers/md/linear.c index b99c19c7eb22..c625ddb8833d 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -111,6 +111,19 @@ static int linear_issue_flush(request_queue_t *q, struct gendisk *disk, 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) { linear_conf_t *conf; @@ -269,6 +282,8 @@ static int linear_run (mddev_t *mddev) blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec); mddev->queue->unplug_fn = linear_unplug; 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; } |