diff options
| author | NeilBrown <neilb@suse.de> | 2010-06-01 11:37:29 +0200 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-07-26 04:53:08 +0200 |
| commit | 252ac5221a71be72b7e7c7b7482af91e9c962e8c (patch) | |
| tree | cb9542b1391dabc136ce0052eb28948e77a6e2e5 | |
| parent | md/raid5: add simple plugging infrastructure. (diff) | |
| download | linux-252ac5221a71be72b7e7c7b7482af91e9c962e8c.tar.xz linux-252ac5221a71be72b7e7c7b7482af91e9c962e8c.zip | |
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>
| -rw-r--r-- | drivers/md/md.c | 15 | ||||
| -rw-r--r-- | drivers/md/md.h | 2 | ||||
| -rw-r--r-- | drivers/md/raid5.c | 1 |
3 files changed, 15 insertions, 3 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index eec75f130708..03c64e9735fb 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -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)); diff --git a/drivers/md/md.h b/drivers/md/md.h index 5be0d6921b9d..57eb864a8249 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -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. diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 84bb9aec2211..0a8173e650bb 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -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 |