Commit 50887bd1 authored Oct 06, 2015 by Junichi Nomura Committed by Mike Snitzer Oct 06, 2015

dm: fix request-based dm error reporting



end_clone_bio() is a endio callback for clone bio and should check
and save the clone's bi_error for error reporting.  However,
4246a0b6 ("block: add a bi_error field to struct bio") changed
the function to check the original bio's bi_error, which is 0.

Without this fix, clone's error is ignored and reported to the
original request as success.  Thus data corruption will be observed.

Fixes: 4246a0b6 ("block: add a bi_error field to struct bio")
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

parent 042745ee

drivers/md/dm.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -1001,6 +1001,7 @@ static void end_clone_bio(struct bio *clone)
		struct dm_rq_target_io *tio = info->tio;
		struct bio *bio = info->orig;
		unsigned int nr_bytes = info->orig->bi_iter.bi_size;
		int error = clone->bi_error;

		bio_put(clone);

		@@ -1011,13 +1012,13 @@ static void end_clone_bio(struct bio *clone)
		* the remainder.
		*/
		return;
		else if (bio->bi_error) {
		else if (error) {
		/*
		* Don't notice the error to the upper layer yet.
		* The error handling decision is made by the target driver,
		* when the request is completed.
		*/
		tio->error = bio->bi_error;
		tio->error = error;
		return;
		}