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rbd: store lock cookie 

In preparation for supporting set_cookie method (or rather set_cookie
fallback for older OSDs), store the lock cookie on lock and use it on
unlock instead of recalculating from rbd_dev->watch_cookie.

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 12:17:38 +02:00
parent bbead745d9
commit cbbfb0ff11
1 changed files with 8 additions and 5 deletions
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13
drivers/block/rbd.c
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@ -387,6 +387,7 @@ struct rbd_device {
struct rw_semaphore lock_rwsem;
enum rbd_lock_state lock_state;
char lock_cookie[32];
struct rbd_client_id owner_cid;
struct work_struct acquired_lock_work;
struct work_struct released_lock_work;
@ -3079,7 +3080,8 @@ static int rbd_lock(struct rbd_device *rbd_dev)
char cookie[32];
int ret;
WARN_ON(__rbd_is_lock_owner(rbd_dev));
WARN_ON(__rbd_is_lock_owner(rbd_dev) ||
rbd_dev->lock_cookie[0] != '\0');
format_lock_cookie(rbd_dev, cookie);
ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
@ -3089,6 +3091,7 @@ static int rbd_lock(struct rbd_device *rbd_dev)
return ret;
rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED;
strcpy(rbd_dev->lock_cookie, cookie);
rbd_set_owner_cid(rbd_dev, &cid);
queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work);
return 0;
@ -3100,19 +3103,19 @@ static int rbd_lock(struct rbd_device *rbd_dev)
static void rbd_unlock(struct rbd_device *rbd_dev)
{
struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
char cookie[32];
int ret;
WARN_ON(!__rbd_is_lock_owner(rbd_dev));
WARN_ON(!__rbd_is_lock_owner(rbd_dev) ||
rbd_dev->lock_cookie[0] == '\0');
format_lock_cookie(rbd_dev, cookie);
ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc,
RBD_LOCK_NAME, cookie);
RBD_LOCK_NAME, rbd_dev->lock_cookie);
if (ret && ret != -ENOENT)
rbd_warn(rbd_dev, "failed to unlock: %d", ret);
/* treat errors as the image is unlocked */
rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED;
rbd_dev->lock_cookie[0] = '\0';
rbd_set_owner_cid(rbd_dev, &rbd_empty_cid);
queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work);
}