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MD RAID10: Export md_raid10_congested

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md/raid10: Export is_congested test.

In similar fashion to commits
	11d8a6e371
	1ed7242e59
we export the RAID10 congestion checking function so that dm-raid.c can
make use of it and make use of the personality.  The 'queue' and 'gendisk'
structures will not be available to the MD code when device-mapper sets
up the device, so we conditionalize access to these fields also.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jonathan Brassow 2012-07-31 10:03:53 +10:00 committed by NeilBrown
parent 473e87ce48
commit cc4d1efdd0
2 changed files with 37 additions and 22 deletions
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56
drivers/md/raid10.c
View File

@ -853,9 +853,8 @@ static struct md_rdev *read_balance(struct r10conf *conf,
return rdev;
}
static int raid10_congested(void *data, int bits)
int md_raid10_congested(struct mddev *mddev, int bits)
{
struct mddev *mddev = data;
struct r10conf *conf = mddev->private;
int i, ret = 0;
@ -863,8 +862,6 @@ static int raid10_congested(void *data, int bits)
conf->pending_count >= max_queued_requests)
return 1;
if (mddev_congested(mddev, bits))
return 1;
rcu_read_lock();
for (i = 0;
(i < conf->geo.raid_disks || i < conf->prev.raid_disks)
@ -880,6 +877,15 @@ static int raid10_congested(void *data, int bits)
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(md_raid10_congested);
static int raid10_congested(void *data, int bits)
{
struct mddev *mddev = data;
return mddev_congested(mddev, bits) ||
md_raid10_congested(mddev, bits);
}
static void flush_pending_writes(struct r10conf *conf)
{
@ -3486,12 +3492,14 @@ static int run(struct mddev *mddev)
conf->thread = NULL;
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
if (conf->geo.raid_disks % conf->geo.near_copies)
blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
else
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->geo.raid_disks / conf->geo.near_copies));
if (mddev->queue) {
blk_queue_io_min(mddev->queue, chunk_size);
if (conf->geo.raid_disks % conf->geo.near_copies)
blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks);
else
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->geo.raid_disks / conf->geo.near_copies));
}
rdev_for_each(rdev, mddev) {
long long diff;
@ -3525,8 +3533,9 @@ static int run(struct mddev *mddev)
if (first || diff < min_offset_diff)
min_offset_diff = diff;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
if (mddev->gendisk)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
disk->head_position = 0;
}
@ -3589,22 +3598,22 @@ static int run(struct mddev *mddev)
md_set_array_sectors(mddev, size);
mddev->resync_max_sectors = size;
mddev->queue->backing_dev_info.congested_fn = raid10_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
/* Calculate max read-ahead size.
* We need to readahead at least twice a whole stripe....
* maybe...
*/
{
if (mddev->queue) {
int stripe = conf->geo.raid_disks *
((mddev->chunk_sectors << 9) / PAGE_SIZE);
mddev->queue->backing_dev_info.congested_fn = raid10_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
/* Calculate max read-ahead size.
* We need to readahead at least twice a whole stripe....
* maybe...
*/
stripe /= conf->geo.near_copies;
if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
}
blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
if (md_integrity_register(mddev))
goto out_free_conf;
@ -3655,7 +3664,10 @@ static int stop(struct mddev *mddev)
lower_barrier(conf);
md_unregister_thread(&mddev->thread);
blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
if (mddev->queue)
/* the unplug fn references 'conf'*/
blk_sync_queue(mddev->queue);
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
kfree(conf->mirrors);

3
drivers/md/raid10.h
View File

@ -145,4 +145,7 @@ enum r10bio_state {
*/
R10BIO_Previous,
};
extern int md_raid10_congested(struct mddev *mddev, int bits);
#endif