From a0ea3a40fd20b8c66381f747c454f89d6d1f50d4 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@inktank.com>
Date: Wed, 10 Oct 2012 21:19:13 -0700
Subject: [PATCH] rbd: zero return code in rbd_dev_image_id()
When rbd_dev_probe() calls rbd_dev_image_id() it expects to get
a 0 return code if successful, but it is getting a positive value.
The reason is that rbd_dev_image_id() returns the value it gets from
rbd_req_sync_exec(), which returns the number of bytes read in as a
result of the request. (This ultimately comes from
ceph_copy_from_page_vector() in rbd_req_sync_op()).
Force the return value to 0 when successful in rbd_dev_image_id().
Do the same in rbd_dev_v2_object_prefix().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
---
drivers/block/rbd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 4a16464ad5bb..94d613208c4f 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2207,6 +2207,7 @@ static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
if (ret < 0)
goto out;
+ ret = 0; /* rbd_req_sync_exec() can return positive */
p = reply_buf;
rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p,
@@ -2900,6 +2901,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
if (ret < 0)
goto out;
+ ret = 0; /* rbd_req_sync_exec() can return positive */
p = response;
rbd_dev->image_id = ceph_extract_encoded_string(&p,
--
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