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md/raid5: export is_congested test

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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>
This commit is contained in:
NeilBrown 2010-07-26 11:57:07 +10:00
parent 4a5add4995
commit 11d8a6e371
2 changed files with 17 additions and 7 deletions
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22
drivers/md/raid5.c
View File

@ -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;

2
drivers/md/raid5.h
View File

@ -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