From: Greg Edwards <gedwards@ddn.com>
Date: Thu, 26 Jul 2018 18:39:37 +0000 (-0400)
Subject: block: reset bi_iter.bi_done after splitting bio
X-Git-Tag: v4.14.60~30
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b8088c524ae21dc97c86e09f0e41bb419804b5ad;p=platform%2Fkernel%2Flinux-exynos.git

block: reset bi_iter.bi_done after splitting bio

commit 5151842b9d8732d4cbfa8400b40bff894f501b2f upstream.

After the bio has been updated to represent the remaining sectors, reset
bi_done so bio_rewind_iter() does not rewind further than it should.

This resolves a bio_integrity_process() failure on reads where the
original request was split.

Fixes: 63573e359d05 ("bio-integrity: Restore original iterator on verify stage")
Signed-off-by: Greg Edwards <gedwards@ddn.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/block/bio.c b/block/bio.c
index e5df699..194d28cd 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1889,6 +1889,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
 		bio_integrity_trim(split);
 
 	bio_advance(bio, split->bi_iter.bi_size);
+	bio->bi_iter.bi_done = 0;
 
 	if (bio_flagged(bio, BIO_TRACE_COMPLETION))
 		bio_set_flag(split, BIO_TRACE_COMPLETION);