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OpenCloudOS-Kernel
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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>
This commit is contained in:
Ilya Dryomov 2017-04-13 12:17:39 +02:00
parent f9bebd5803
commit 3b77faa049
1 changed files with 26 additions and 14 deletions
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40
drivers/block/rbd.c
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@ -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;