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37 #define DEBUG_SUBSYSTEM S_LDLM
39 #include <libcfs/libcfs.h>
41 #include <liblustre.h>
44 #include <lustre_dlm.h>
45 #include <lustre_lib.h>
48 * Lock a lock and its resource.
50 * LDLM locking uses resource to serialize access to locks
51 * but there is a case when we change resource of lock upon
52 * enqueue reply. We rely on lock->l_resource = new_res
53 * being an atomic operation.
55 struct ldlm_resource *lock_res_and_lock(struct ldlm_lock *lock)
57 /* on server-side resource of lock doesn't change */
59 spin_lock(&lock->l_lock);
61 lock_res(lock->l_resource);
63 lock->l_res_locked = 1;
64 return lock->l_resource;
66 EXPORT_SYMBOL(lock_res_and_lock);
69 * Unlock a lock and its resource previously locked with lock_res_and_lock
71 void unlock_res_and_lock(struct ldlm_lock *lock)
73 /* on server-side resource of lock doesn't change */
74 lock->l_res_locked = 0;
76 unlock_res(lock->l_resource);
78 spin_unlock(&lock->l_lock);
80 EXPORT_SYMBOL(unlock_res_and_lock);