lockd: eliminate duplicate nlmsvc_lookup_host call from nlmsvc_testlock

nlmsvc_testlock calls nlmsvc_lookup_host to find a nlm_host struct. The
callers of this functions, however, call nlmsvc_retrieve_args or
nlm4svc_retrieve_args, which also return a nlm_host struct.

Change nlmsvc_testlock to take a host arg instead of calling
nlmsvc_lookup_host itself and change the callers to pass a pointer to
the nlm_host they've already found.

We take a reference to host in the place where nlmsvc_testlock()
previous did a new lookup, so the reference counting is unchanged from
before.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

4 files changed, 7 insertions, 12 deletions

diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 006a832d46f2..8cfb9daa7c77 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -99,7 +99,7 @@ nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
 
         /* Now check for conflicting locks */
-        resp->status = nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie);
+        resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
         if (resp->status == nlm_drop_reply)
                 rc = rpc_drop_reply;
         else
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 81aca859bfde..f40afb3a0e69 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -460,8 +460,8 @@ out:
  */
 __be32
 nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
-                struct nlm_lock *lock, struct nlm_lock *conflock,
-                struct nlm_cookie *cookie)
+                struct nlm_host *host, struct nlm_lock *lock,
+                struct nlm_lock *conflock, struct nlm_cookie *cookie)
 {
         struct nlm_block        *block = NULL;
         int                     error;
@@ -479,16 +479,10 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
 
         if (block == NULL) {
                 struct file_lock *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
-                struct nlm_host *host;
 
                 if (conf == NULL)
                         return nlm_granted;
-                /* Create host handle for callback */
-                host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len);
-                if (host == NULL) {
-                        kfree(conf);
-                        return nlm_lck_denied_nolocks;
-                }
+                nlm_get_host(host);
                 block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
                 if (block == NULL) {
                         kfree(conf);
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index fce3d7039625..e099f589b61b 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -128,7 +128,7 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
                 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
 
         /* Now check for conflicting locks */
-        resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie));
+        resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie));
         if (resp->status == nlm_drop_reply)
                 rc = rpc_drop_reply;
         else
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 102d928f7206..b27967034b53 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -203,7 +203,8 @@ __be32		  nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
                                         struct nlm_lock *, int, struct nlm_cookie *);
 __be32            nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
 __be32            nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
-                        struct nlm_lock *, struct nlm_lock *, struct nlm_cookie *);
+                        struct nlm_host *, struct nlm_lock *,
+                        struct nlm_lock *, struct nlm_cookie *);
 __be32            nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
 unsigned long     nlmsvc_retry_blocked(void);
 void              nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,