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md/raid5: export raid5 unplugging interface. 

Also remove remaining accesses to ->queue and ->gendisk when ->queue
is NULL (As it is in a DM target).

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-07-26 12:04:13 +10:00
parent 252ac5221a
commit 9f7c222001
2 changed files with 20 additions and 20 deletions
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39
drivers/md/raid5.c
View File

@ -434,7 +434,6 @@ static int has_failed(raid5_conf_t *conf)
}
static void unplug_slaves(mddev_t *mddev);
static void raid5_unplug_device(raid5_conf_t *conf);
static struct stripe_head *
get_active_stripe(raid5_conf_t *conf, sector_t sector,
@ -464,7 +463,7 @@ get_active_stripe(raid5_conf_t *conf, sector_t sector,
< (conf->max_nr_stripes *3/4)
|| !conf->inactive_blocked),
conf->device_lock,
raid5_unplug_device(conf)
md_raid5_unplug_device(conf)
);
conf->inactive_blocked = 0;
} else
@ -3659,7 +3658,7 @@ static void unplug_slaves(mddev_t *mddev)
rcu_read_unlock();
}
static void raid5_unplug_device(raid5_conf_t *conf)
void md_raid5_unplug_device(raid5_conf_t *conf)
{
unsigned long flags;
@ -3675,17 +3674,18 @@ static void raid5_unplug_device(raid5_conf_t *conf)
unplug_slaves(conf->mddev);
}
EXPORT_SYMBOL_GPL(md_raid5_unplug_device);
static void raid5_unplug(struct plug_handle *plug)
{
raid5_conf_t *conf = container_of(plug, raid5_conf_t, plug);
raid5_unplug_device(conf);
md_raid5_unplug_device(conf);
}
static void raid5_unplug_queue(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
raid5_unplug_device(mddev->private);
md_raid5_unplug_device(mddev->private);
}
int md_raid5_congested(mddev_t *mddev, int bits)
@ -4095,7 +4095,7 @@ static int make_request(mddev_t *mddev, struct bio * bi)
* add failed due to overlap. Flush everything
* and wait a while
*/
raid5_unplug_device(conf);
md_raid5_unplug_device(conf);
release_stripe(sh);
schedule();
goto retry;
@ -4991,7 +4991,7 @@ static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded
static int run(mddev_t *mddev)
{
raid5_conf_t *conf;
int working_disks = 0, chunk_size;
int working_disks = 0;
int dirty_parity_disks = 0;
mdk_rdev_t *rdev;
sector_t reshape_offset = 0;
@ -5191,6 +5191,7 @@ static int run(mddev_t *mddev)
plugger_init(&conf->plug, raid5_unplug);
mddev->plug = &conf->plug;
if (mddev->queue) {
int chunk_size;
/* read-ahead size must cover two whole stripes, which
* is 2 * (datadisks) * chunksize where 'n' is the
* number of raid devices
@ -5205,21 +5206,19 @@ static int run(mddev_t *mddev)
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_queue;
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->raid_disks - conf->max_degraded));
list_for_each_entry(rdev, &mddev->disks, same_set)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
}
mddev->queue->queue_lock = &conf->device_lock;
mddev->queue->unplug_fn = raid5_unplug_queue;
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
blk_queue_io_opt(mddev->queue, chunk_size *
(conf->raid_disks - conf->max_degraded));
list_for_each_entry(rdev, &mddev->disks, same_set)
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
return 0;
abort:
md_unregister_thread(mddev->thread);

1
drivers/md/raid5.h
View File

@ -502,5 +502,6 @@ static inline int algorithm_is_DDF(int layout)
}
extern int md_raid5_congested(mddev_t *mddev, int bits);
extern void md_raid5_unplug_device(raid5_conf_t *conf);
extern int raid5_set_cache_size(mddev_t *mddev, int size);
#endif