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Commit 19d5f834 authored by NeilBrown's avatar NeilBrown
Browse files

md/raid10: unify handling of write completion. 



A write can complete at two different places:
1/ when the last member-device write completes, through
   raid10_end_write_request
2/ in make_request() when we remove the initial bias from ->remaining.

These two should do exactly the same thing and the comment says they
do, but they don't.

So factor the correct code out into a function and call it in both
places.  This makes the code much more similar to RAID1.

The difference is only significant if there is an error, and they
usually take a while, so it is unlikely that there will be an error
already when make_request is completing, so this is unlikely to cause
real problems.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 94007751

drivers/md/raid10.c

+18 −20
Original line number Diff line number Diff line
@@ -337,6 +337,21 @@ static void close_write(r10bio_t *r10_bio) 
	md_write_end(r10_bio->mddev);

}



static void one_write_done(r10bio_t *r10_bio)

{

	if (atomic_dec_and_test(&r10_bio->remaining)) {

		if (test_bit(R10BIO_WriteError, &r10_bio->state))

			reschedule_retry(r10_bio);

		else {

			close_write(r10_bio);

			if (test_bit(R10BIO_MadeGood, &r10_bio->state))

				reschedule_retry(r10_bio);

			else

				raid_end_bio_io(r10_bio);

		}

	}

}



static void raid10_end_write_request(struct bio *bio, int error)

{

	int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
@@ -387,17 +402,7 @@ static void raid10_end_write_request(struct bio *bio, int error) 
	 * Let's see if all mirrored write operations have finished

	 * already.

	 */

	if (atomic_dec_and_test(&r10_bio->remaining)) {

		if (test_bit(R10BIO_WriteError, &r10_bio->state))

			reschedule_retry(r10_bio);

		else {

			close_write(r10_bio);

			if (test_bit(R10BIO_MadeGood, &r10_bio->state))

				reschedule_retry(r10_bio);

			else

				raid_end_bio_io(r10_bio);

		}

	}

	one_write_done(r10_bio);

	if (dec_rdev)

		rdev_dec_pending(conf->mirrors[dev].rdev, conf->mddev);

}
@@ -1127,15 +1132,8 @@ static int make_request(mddev_t *mddev, struct bio * bio) 
		spin_unlock_irqrestore(&conf->device_lock, flags);

	}



	if (atomic_dec_and_test(&r10_bio->remaining)) {

		/* This matches the end of raid10_end_write_request() */

		bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector,

				r10_bio->sectors,

				!test_bit(R10BIO_Degraded, &r10_bio->state),

				0);

		md_write_end(mddev);

		raid_end_bio_io(r10_bio);

	}

	/* Remove the bias on 'remaining' */

	one_write_done(r10_bio);



	/* In case raid10d snuck in to freeze_array */

	wake_up(&conf->wait_barrier);