diff options
| author | NeilBrown <neilb@suse.de> | 2006-10-03 12:15:54 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-03 19:04:18 +0400 |
| commit | 0d12922823408b26f83b15cae4a4feff4bd22f28 (patch) | |
| tree | a3509f442e6fc75ca9304757ffa3dce4918ef55e /drivers/md/multipath.c | |
| parent | 26be34dc3a46be983352dd89683db374b0cb73fa (diff) | |
| download | linux-0d12922823408b26f83b15cae4a4feff4bd22f28.tar.xz | |
[PATCH] md: define ->congested_fn for raid1, raid10, and multipath
raid1, raid10 and multipath don't report their 'congested' status through
bdi_*_congested, but should.
This patch adds the appropriate functions which just check the 'congested'
status of all active members (with appropriate locking).
raid1 read_balance should be modified to prefer devices where
bdi_read_congested returns false. Then we could use the '&' branch rather
than the '|' branch. However that should would need some benchmarking first
to make sure it is actually a good idea.
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/multipath.c')
| -rw-r--r-- | drivers/md/multipath.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index e4f168d063db..171ff41b52b0 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -228,6 +228,28 @@ static int multipath_issue_flush(request_queue_t *q, struct gendisk *disk, rcu_read_unlock(); return ret; } +static int multipath_congested(void *data, int bits) +{ + mddev_t *mddev = data; + multipath_conf_t *conf = mddev_to_conf(mddev); + int i, ret = 0; + + rcu_read_lock(); + for (i = 0; i < mddev->raid_disks ; i++) { + mdk_rdev_t *rdev = rcu_dereference(conf->multipaths[i].rdev); + if (rdev && !test_bit(Faulty, &rdev->flags)) { + request_queue_t *q = bdev_get_queue(rdev->bdev); + + ret |= bdi_congested(&q->backing_dev_info, bits); + /* Just like multipath_map, we just check the + * first available device + */ + break; + } + } + rcu_read_unlock(); + return ret; +} /* * Careful, this can execute in IRQ contexts as well! @@ -509,6 +531,8 @@ static int multipath_run (mddev_t *mddev) mddev->queue->unplug_fn = multipath_unplug; mddev->queue->issue_flush_fn = multipath_issue_flush; + mddev->queue->backing_dev_info.congested_fn = multipath_congested; + mddev->queue->backing_dev_info.congested_data = mddev; return 0; |