diff options
| author |   NeilBrown <neilb@suse.de> | 2010-07-26 11:57:07 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-07-26 12:52:29 +1000 |
| commit | 11d8a6e3719519fbc0e2c9d61b6fa931b84bf813 (patch) | |
| tree | 13a075d1423b2caa3d3264db0cf8cd378c545623 /drivers/md | |
| parent | raid5: Don't set read-ahead when there is no queue (diff) | |
| download | linux-dev-11d8a6e3719519fbc0e2c9d61b6fa931b84bf813.tar.xz linux-dev-11d8a6e3719519fbc0e2c9d61b6fa931b84bf813.zip | |
md/raid5: export is_congested test
the dm module will need this for dm-raid45.
Also only access ->queue->backing_dev_info->congested_fn
if ->queue actually exists. It won't in a dm target.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 22 | ||||
| -rw-r--r-- | drivers/md/raid5.h | 2 |
2 files changed, 17 insertions, 7 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 9c462f6659c3..ad6694f8a3a8 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3678,17 +3678,14 @@ static void raid5_unplug_device(struct request_queue *q) unplug_slaves(mddev); } -static int raid5_congested(void *data, int bits) +int md_raid5_congested(mddev_t *mddev, int bits) { - mddev_t *mddev = data; raid5_conf_t *conf = mddev->private; /* No difference between reads and writes. Just check * how busy the stripe_cache is */ - if (mddev_congested(mddev, bits)) - return 1; if (conf->inactive_blocked) return 1; if (conf->quiesce) @@ -3698,6 +3695,15 @@ static int raid5_congested(void *data, int bits) return 0; } +EXPORT_SYMBOL_GPL(md_raid5_congested); + +static int raid5_congested(void *data, int bits) +{ + mddev_t *mddev = data; + + return mddev_congested(mddev, bits) || + md_raid5_congested(mddev, bits); +} /* We want read requests to align with chunks where possible, * but write requests don't need to. @@ -5184,13 +5190,14 @@ static int run(mddev_t *mddev) mddev->queue->backing_dev_info.ra_pages = 2 * stripe; blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); + + mddev->queue->backing_dev_info.congested_data = mddev; + mddev->queue->backing_dev_info.congested_fn = raid5_congested; } mddev->queue->queue_lock = &conf->device_lock; mddev->queue->unplug_fn = raid5_unplug_device; - mddev->queue->backing_dev_info.congested_data = mddev; - mddev->queue->backing_dev_info.congested_fn = raid5_congested; chunk_size = mddev->chunk_sectors << 9; blk_queue_io_min(mddev->queue, chunk_size); @@ -5220,7 +5227,8 @@ static int stop(mddev_t *mddev) md_unregister_thread(mddev->thread); mddev->thread = NULL; - mddev->queue->backing_dev_info.congested_fn = NULL; + if (mddev->queue) + mddev->queue->backing_dev_info.congested_fn = NULL; blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ free_conf(conf); mddev->private = NULL; diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 61b6b25dc5e7..d6470dec667a 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -497,5 +497,7 @@ static inline int algorithm_is_DDF(int layout) { return layout >= 8 && layout <= 10; } + +extern int md_raid5_congested(mddev_t *mddev, int bits); extern int raid5_set_cache_size(mddev_t *mddev, int size); #endif |