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md/plug: optionally use plugger to unplug an array during resync/recovery. 

If an array doesn't have a 'queue' then md_do_sync cannot
unplug it.
In that case it will have a 'plugger', so make that available
to the mddev, and use it to unplug the array if needed.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-06-01 19:37:29 +10:00
parent 2ac8740151
commit 252ac5221a
3 changed files with 15 additions and 3 deletions
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15
drivers/md/md.c
View File

@ -4693,6 +4693,7 @@ static void md_clean(mddev_t *mddev)
mddev->bitmap_info.chunksize = 0;
mddev->bitmap_info.daemon_sleep = 0;
mddev->bitmap_info.max_write_behind = 0;
mddev->plug = NULL;
}
void md_stop_writes(mddev_t *mddev)
@ -6626,6 +6627,14 @@ int md_allow_write(mddev_t *mddev)
}
EXPORT_SYMBOL_GPL(md_allow_write);
static void md_unplug(mddev_t *mddev)
{
if (mddev->queue)
blk_unplug(mddev->queue);
if (mddev->plug)
mddev->plug->unplug_fn(mddev->plug);
}
#define SYNC_MARKS 10
#define SYNC_MARK_STEP (3*HZ)
void md_do_sync(mddev_t *mddev)
@ -6804,7 +6813,7 @@ void md_do_sync(mddev_t *mddev)
>= mddev->resync_max - mddev->curr_resync_completed
)) {
/* time to update curr_resync_completed */
blk_unplug(mddev->queue);
md_unplug(mddev);
wait_event(mddev->recovery_wait,
atomic_read(&mddev->recovery_active) == 0);
mddev->curr_resync_completed =
@ -6882,7 +6891,7 @@ void md_do_sync(mddev_t *mddev)
* about not overloading the IO subsystem. (things like an
* e2fsck being done on the RAID array should execute fast)
*/
blk_unplug(mddev->queue);
md_unplug(mddev);
cond_resched();
currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
@ -6901,7 +6910,7 @@ void md_do_sync(mddev_t *mddev)
* this also signals 'finished resyncing' to md_stop
*/
out:
blk_unplug(mddev->queue);
md_unplug(mddev);
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));

2
drivers/md/md.h
View File

@ -328,6 +328,8 @@ struct mddev_s
struct list_head all_mddevs;
struct attribute_group *to_remove;
struct plug_handle *plug; /* if used by personality */
/* Generic barrier handling.
* If there is a pending barrier request, all other
* writes are blocked while the devices are flushed.

1
drivers/md/raid5.c
View File

@ -5189,6 +5189,7 @@ static int run(mddev_t *mddev)
md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
plugger_init(&conf->plug, raid5_unplug);
mddev->plug = &conf->plug;
if (mddev->queue) {
/* read-ahead size must cover two whole stripes, which
* is 2 * (datadisks) * chunksize where 'n' is the