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rbd: use rbd_obj_watch_request_helper() helper 

Switch rbd_dev_header_{un,}watch_sync() to use the new helper and fix
rbd_dev_header_unwatch_sync() to destroy watch_request structures
before queuing watch-remove message while at it.  This mistake slipped
into commit b30a01f2a3 ("rbd: fix osd_request memory leak in
__rbd_dev_header_watch_sync()") and could lead to "image still in use"
errors on image removal.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Ilya Dryomov 2014-06-20 18:29:20 +04:00
parent bb040aa03c
commit 76756a51e2
1 changed files with 17 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

115
drivers/block/rbd.c
View File

@ -3040,130 +3040,49 @@ static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev)
if (ret < 0)
return ret;
rbd_assert(rbd_dev->watch_event);
obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
OBJ_REQUEST_NODATA);
if (!obj_request) {
ret = -ENOMEM;
goto out_cancel;
obj_request = rbd_obj_watch_request_helper(rbd_dev, true);
if (IS_ERR(obj_request)) {
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
return PTR_ERR(obj_request);
}
obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1,
obj_request);
if (!obj_request->osd_req) {
ret = -ENOMEM;
goto out_put;
}
ceph_osdc_set_request_linger(osdc, obj_request->osd_req);
osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
rbd_dev->watch_event->cookie, 0, 1);
rbd_osd_req_format_write(obj_request);
ret = rbd_obj_request_submit(osdc, obj_request);
if (ret)
goto out_linger;
ret = rbd_obj_request_wait(obj_request);
if (ret)
goto out_linger;
ret = obj_request->result;
if (ret)
goto out_linger;
/*
* A watch request is set to linger, so the underlying osd
* request won't go away until we unregister it. We retain
* a pointer to the object request during that time (in
* rbd_dev->watch_request), so we'll keep a reference to
* it. We'll drop that reference (below) after we've
* unregistered it.
* rbd_dev->watch_request), so we'll keep a reference to it.
* We'll drop that reference after we've unregistered it in
* rbd_dev_header_unwatch_sync().
*/
rbd_dev->watch_request = obj_request;
return 0;
out_linger:
ceph_osdc_unregister_linger_request(osdc, obj_request->osd_req);
out_put:
rbd_obj_request_put(obj_request);
out_cancel:
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
return ret;
}
/*
* Tear down a watch request, synchronously.
*/
static int __rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
{
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
struct rbd_obj_request *obj_request;
int ret;
rbd_assert(rbd_dev->watch_event);
rbd_assert(rbd_dev->watch_request);
obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0,
OBJ_REQUEST_NODATA);
if (!obj_request) {
ret = -ENOMEM;
goto out_cancel;
}
obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, 1,
obj_request);
if (!obj_request->osd_req) {
ret = -ENOMEM;
goto out_put;
}
osd_req_op_watch_init(obj_request->osd_req, 0, CEPH_OSD_OP_WATCH,
rbd_dev->watch_event->cookie, 0, 0);
rbd_osd_req_format_write(obj_request);
ret = rbd_obj_request_submit(osdc, obj_request);
if (ret)
goto out_put;
ret = rbd_obj_request_wait(obj_request);
if (ret)
goto out_put;
ret = obj_request->result;
if (ret)
goto out_put;
/* We have successfully torn down the watch request */
ceph_osdc_unregister_linger_request(osdc,
rbd_dev->watch_request->osd_req);
rbd_obj_request_end(rbd_dev->watch_request);
rbd_obj_request_put(rbd_dev->watch_request);
rbd_dev->watch_request = NULL;
out_put:
rbd_obj_request_put(obj_request);
out_cancel:
obj_request = rbd_obj_watch_request_helper(rbd_dev, false);
if (!IS_ERR(obj_request))
rbd_obj_request_put(obj_request);
else
rbd_warn(rbd_dev, "unable to tear down watch request (%ld)",
PTR_ERR(obj_request));
ceph_osdc_cancel_event(rbd_dev->watch_event);
rbd_dev->watch_event = NULL;
return ret;
}
static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
{
int ret;
ret = __rbd_dev_header_unwatch_sync(rbd_dev);
if (ret) {
rbd_warn(rbd_dev, "unable to tear down watch request: %d\n",
ret);
}
}
/*