From 25dcf954c3230946b5f3e18db9f91d7640eff76e Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@inktank.com>
Date: Fri, 25 Jan 2013 17:08:55 -0600
Subject: [PATCH] rbd: decrement obj request count when deleting
Decrement the obj_request_count value when deleting an object
request from its image request's list. Rearrange a few lines
in the surrounding code.
This resolves:
http://tracker.ceph.com/issues/3940
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
---
drivers/block/rbd.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index fc1a045cee4d..d3d15d06abc0 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1063,22 +1063,29 @@ static void rbd_img_request_put(struct rbd_img_request *img_request)
static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request,
struct rbd_obj_request *obj_request)
{
+ rbd_assert(obj_request->img_request == NULL);
+
rbd_obj_request_get(obj_request);
obj_request->img_request = img_request;
- list_add_tail(&obj_request->links, &img_request->obj_requests);
- obj_request->which = img_request->obj_request_count++;
+ obj_request->which = img_request->obj_request_count;
rbd_assert(obj_request->which != BAD_WHICH);
+ img_request->obj_request_count++;
+ list_add_tail(&obj_request->links, &img_request->obj_requests);
}
static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request,
struct rbd_obj_request *obj_request)
{
rbd_assert(obj_request->which != BAD_WHICH);
- obj_request->which = BAD_WHICH;
+
list_del(&obj_request->links);
+ rbd_assert(img_request->obj_request_count > 0);
+ img_request->obj_request_count--;
+ rbd_assert(obj_request->which == img_request->obj_request_count);
+ obj_request->which = BAD_WHICH;
rbd_assert(obj_request->img_request == img_request);
- obj_request->callback = NULL;
obj_request->img_request = NULL;
+ obj_request->callback = NULL;
rbd_obj_request_put(obj_request);
}
@@ -1472,6 +1479,7 @@ static void rbd_img_request_destroy(struct kref *kref)
for_each_obj_request_safe(img_request, obj_request, next_obj_request)
rbd_img_obj_request_del(img_request, obj_request);
+ rbd_assert(img_request->obj_request_count == 0);
if (img_request->write_request)
ceph_put_snap_context(img_request->snapc);
--
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