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authorIlya Dryomov <idryomov@gmail.com>2017-04-13 12:17:39 +0200
committerIlya Dryomov <idryomov@gmail.com>2017-05-04 09:19:24 +0200
commit3b77faa0495abd07e94119681be8cc66af5e0a3b (patch)
tree897acd98e7fe4e702e2be864c1c3434c8ad4a465 /drivers/block
parentf9bebd580360c141b5fdbede9cc13a4caf23cd1a (diff)
rbd: return ResponseMessage result from rbd_handle_request_lock()
Right now it's just 0, but "no automatic exclusive lock transfers" mode code will need -EROFS. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jason Dillaman <dillaman@redhat.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/rbd.c40
1 files changed, 26 insertions, 14 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index e3fafaf97dee..8babb1a59a0a 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3572,12 +3572,16 @@ static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v,
up_read(&rbd_dev->lock_rwsem);
}
-static bool rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v,
- void **p)
+/*
+ * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no
+ * ResponseMessage is needed.
+ */
+static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v,
+ void **p)
{
struct rbd_client_id my_cid = rbd_get_cid(rbd_dev);
struct rbd_client_id cid = { 0 };
- bool need_to_send;
+ int result = 1;
if (struct_v >= 2) {
cid.gid = ceph_decode_64(p);
@@ -3587,19 +3591,30 @@ static bool rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v,
dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid,
cid.handle);
if (rbd_cid_equal(&cid, &my_cid))
- return false;
+ return result;
down_read(&rbd_dev->lock_rwsem);
- need_to_send = __rbd_is_lock_owner(rbd_dev);
- if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) {
- if (!rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) {
+ if (__rbd_is_lock_owner(rbd_dev)) {
+ if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED &&
+ rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid))
+ goto out_unlock;
+
+ /*
+ * encode ResponseMessage(0) so the peer can detect
+ * a missing owner
+ */
+ result = 0;
+
+ if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) {
dout("%s rbd_dev %p queueing unlock_work\n", __func__,
rbd_dev);
queue_work(rbd_dev->task_wq, &rbd_dev->unlock_work);
}
}
+
+out_unlock:
up_read(&rbd_dev->lock_rwsem);
- return need_to_send;
+ return result;
}
static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev,
@@ -3682,13 +3697,10 @@ static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie,
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
break;
case RBD_NOTIFY_OP_REQUEST_LOCK:
- if (rbd_handle_request_lock(rbd_dev, struct_v, &p))
- /*
- * send ResponseMessage(0) back so the client
- * can detect a missing owner
- */
+ ret = rbd_handle_request_lock(rbd_dev, struct_v, &p);
+ if (ret <= 0)
rbd_acknowledge_notify_result(rbd_dev, notify_id,
- cookie, 0);
+ cookie, ret);
else
rbd_acknowledge_notify(rbd_dev, notify_id, cookie);
break;