From: Mikulas Patocka Date: Mon, 22 Jun 2009 09:12:18 +0000 (+0100) Subject: dm: process requeue in dm_wq_work X-Git-Tag: firefly_0821_release~13598^2~34 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2761e95fe40ca0d01864310fa4d488d7c5e34e18;p=firefly-linux-kernel-4.4.55.git dm: process requeue in dm_wq_work If barrier request was returned with DM_ENDIO_REQUEUE, requeue it in dm_wq_work instead of dec_pending. This allows us to correctly handle a situation when some targets are asking for a requeue and other targets signal an error. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- diff --git a/drivers/md/dm.c b/drivers/md/dm.c index e34d694ddd04..910bce85f443 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -536,9 +536,11 @@ static void dec_pending(struct dm_io *io, int error) * Target requested pushing back the I/O. */ spin_lock_irqsave(&md->deferred_lock, flags); - if (__noflush_suspending(md)) - bio_list_add_head(&md->deferred, io->bio); - else + if (__noflush_suspending(md)) { + if (!bio_barrier(io->bio)) + bio_list_add_head(&md->deferred, + io->bio); + } else /* noflush suspend was interrupted. */ io->error = -EIO; spin_unlock_irqrestore(&md->deferred_lock, flags); @@ -1458,6 +1460,11 @@ static void process_barrier(struct mapped_device *md, struct bio *bio) if (md->barrier_error != DM_ENDIO_REQUEUE) bio_endio(bio, md->barrier_error); + else { + spin_lock_irq(&md->deferred_lock); + bio_list_add_head(&md->deferred, bio); + spin_unlock_irq(&md->deferred_lock); + } } /*