Add a function to sys/nlm/nlm_prot_impl.c that returns a unique

lock sysid to be used for non-nlm remote locking. This is required
for the experimental nfsv4 server, so that it can acquire byte
range locks correctly on behalf of nfsv4 clients.

Reviewed by:	dfr
Approved by:	kib (mentor)

2 files changed, 19 insertions, 0 deletions

diff --git a/sys/nlm/nlm.h b/sys/nlm/nlm.h
index 27b921f..d2c5ee1 100644
--- a/sys/nlm/nlm.h
+++ b/sys/nlm/nlm.h
@@ -210,6 +210,11 @@ struct vop_reclaim_args;
 extern int nlm_advlock(struct vop_advlock_args *ap);
 extern int nlm_reclaim(struct vop_reclaim_args *ap);
 
+/*
+ * Acquire the next sysid for remote locks not handled by the NLM.
+ */
+extern uint32_t nlm_acquire_next_sysid(void);
+
 #endif
 
 #endif
diff --git a/sys/nlm/nlm_prot_impl.c b/sys/nlm/nlm_prot_impl.c
index a46d432..6ee6baa 100644
--- a/sys/nlm/nlm_prot_impl.c
+++ b/sys/nlm/nlm_prot_impl.c
@@ -835,6 +835,20 @@ nlm_create_host(const char* caller_name)
 }
 
 /*
+ * Acquire the next sysid for remote locks not handled by the NLM.
+ */
+uint32_t
+nlm_acquire_next_sysid(void)
+{
+	uint32_t next_sysid;
+
+	mtx_lock(&nlm_global_lock);
+	next_sysid = nlm_next_sysid++;
+	mtx_unlock(&nlm_global_lock);
+	return (next_sysid);
+}
+
+/*
  * Return non-zero if the address parts of the two sockaddrs are the
  * same.
  */