linux-kernel - [PATCH 3.12 094/142] rbd: end I/O the entire obj

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Message-Id: <8ed0623b0a8604c336c51a44259aa5581343ba6f.1431761807.git.jslaby@suse.cz>
Date:	Sat, 16 May 2015 09:37:34 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
	Alex Elder <elder@...aro.org>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 094/142] rbd: end I/O the entire obj_request on error

From: Ilya Dryomov <idryomov@...il.com>

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

===============

commit 082a75dad84d79d1c15ea9e50f31cb4bb4fa7fd6 upstream.

When we end I/O struct request with error, we need to pass
obj_request->length as @nr_bytes so that the entire obj_request worth
of bytes is completed.  Otherwise block layer ends up confused and we
trip on

    rbd_assert(more ^ (which == img_request->obj_request_count));

in rbd_img_obj_callback() due to more being true no matter what.  We
already do it in most cases but we are missing some, in particular
those where we don't even get a chance to submit any obj_requests, due
to an early -ENOMEM for example.

A number of obj_request->xferred assignments seem to be redundant but
I haven't touched any of obj_request->xferred stuff to keep this small
and isolated.

Cc: Alex Elder <elder@...aro.org>
Reported-by: Shawn Edwards <lesser.evil@...il.com>
Reviewed-by: Sage Weil <sage@...hat.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/block/rbd.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 2eb4458f4ba8..78bfd5021827 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2103,6 +2103,11 @@ static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request)
 			result, xferred);
 		if (!img_request->result)
 			img_request->result = result;
+		/*
+		 * Need to end I/O on the entire obj_request worth of
+		 * bytes in case of error.
+		 */
+		xferred = obj_request->length;
 	}
 
 	/* Image object requests don't own their page array */
-- 
2.3.7

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