NLM: Introduce external nlm_host set-up and tear-down functions

We would like to remove the per-lock-operation nlm_lookup_host() call from
nlmclnt_proc().

The new architecture pins an nlm_host structure to each NFS client
superblock that has the "lock" mount option set.  The NFS client passes
in the pinned nlm_host structure during each call to nlmclnt_proc().  NFS
client unmount processing "puts" the nlm_host so it can be garbage-
collected later.

This patch introduces externally callable NLM functions that handle
mount-time nlm_host set up and tear-down.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/lockd/bind.h b/include/linux/lockd/bind.h
index 6f1637c61e10..ad5402f5456b 100644
--- a/include/linux/lockd/bind.h
+++ b/include/linux/lockd/bind.h
@@ -35,6 +35,13 @@ extern struct nlmsvc_binding *	nlmsvc_ops;
 /*
  * Functions exported by the lockd module
  */
+extern struct nlm_host *nlmclnt_init(const char *server_name,
+                                        const struct sockaddr *server_address,
+                                        size_t server_addrlen,
+                                        unsigned short protocol,
+                                        u32 nfs_version);
+extern void     nlmclnt_done(struct nlm_host *host);
+
 extern int      nlmclnt_proc(struct inode *, int, struct file_lock *);
 extern int      lockd_up(int proto);
 extern void     lockd_down(void);