linux-kernel - [PATCH 4.13 008/110] dm integrity: do not check integrity for failed read operations

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Date:   Tue,  3 Oct 2017 14:28:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hyunchul Lee <cheol.lee@....com>,
        Milan Broz <gmazyland@...il.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.13 008/110] dm integrity: do not check integrity for failed read operations

4.13-stable review patch.  If anyone has any objections, please let me know.

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

From: Hyunchul Lee <cheol.lee@....com>

commit b7e326f7b7375392d06f9cfbc27a7c63181f69d7 upstream.

Even though read operations fail, dm_integrity_map_continue() calls
integrity_metadata() to check integrity.  In this case, just complete
these.

This also makes it so read I/O errors do not generate integrity warnings
in the kernel log.

Signed-off-by: Hyunchul Lee <cheol.lee@....com>
Acked-by: Milan Broz <gmazyland@...il.com>
Acked-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-integrity.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1697,7 +1697,11 @@ sleep:
 
 	if (need_sync_io) {
 		wait_for_completion_io(&read_comp);
-		integrity_metadata(&dio->work);
+		if (likely(!bio->bi_status))
+			integrity_metadata(&dio->work);
+		else
+			dec_in_flight(dio);
+
 	} else {
 		INIT_WORK(&dio->work, integrity_metadata);
 		queue_work(ic->metadata_wq, &dio->work);