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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Greg Edwards <gedwards@ddn.com>,
        Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4.14 217/246] block: reset bi_iter.bi_done after splitting bio
Date:   Wed,  1 Aug 2018 18:52:07 +0200
Message-Id: <20180801165022.105121223@linuxfoundation.org>
In-Reply-To: <20180801165011.700991984@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Greg Edwards <gedwards@ddn.com>

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>

---
 block/bio.c |    1 +
 1 file changed, 1 insertion(+)

--- a/block/bio.c
+++ b/block/bio.c
@@ -1889,6 +1889,7 @@ struct bio *bio_split(struct bio *bio, i
 		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);