SUNRPC: cleanup GSS pipes usage

Currently gss auth holds RPC inode pointer which is now redundant since it
requires only pipes operations which takes private pipe data as an argument.
Thus this code can be cleaned and all references to RPC inode can be replaced
with privtae pipe data references.

Signed-off-by: Stanislav Kinsbursky <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

net/sunrpc/auth_gss/auth_gss.c

···
 /* gss_cred_set_ctx:
  * called by gss_upcall_callback and gss_create_upcall in order
  * to set the gss context. The actual exchange of an old context
- * and a new one is protected by the rpci->pipe->lock.
+ * and a new one is protected by the pipe->lock.
  */
 static void
 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
···
 	struct rpc_pipe_msg msg;
 	struct list_head list;
 	struct gss_auth *auth;
-	struct rpc_inode *inode;
+	struct rpc_pipe *pipe;
 	struct rpc_wait_queue rpc_waitqueue;
 	wait_queue_head_t waitqueue;
 	struct gss_cl_ctx *ctx;
···
 }
 
 static struct gss_upcall_msg *
-__gss_find_upcall(struct rpc_inode *rpci, uid_t uid)
+__gss_find_upcall(struct rpc_pipe *pipe, uid_t uid)
 {
 	struct gss_upcall_msg *pos;
-	list_for_each_entry(pos, &rpci->pipe->in_downcall, list) {
+	list_for_each_entry(pos, &pipe->in_downcall, list) {
 		if (pos->uid != uid)
 			continue;
 		atomic_inc(&pos->count);
···
 static inline struct gss_upcall_msg *
 gss_add_msg(struct gss_upcall_msg *gss_msg)
 {
-	struct rpc_inode *rpci = gss_msg->inode;
+	struct rpc_pipe *pipe = gss_msg->pipe;
 	struct gss_upcall_msg *old;
 
-	spin_lock(&rpci->pipe->lock);
-	old = __gss_find_upcall(rpci, gss_msg->uid);
+	spin_lock(&pipe->lock);
+	old = __gss_find_upcall(pipe, gss_msg->uid);
 	if (old == NULL) {
 		atomic_inc(&gss_msg->count);
-		list_add(&gss_msg->list, &rpci->pipe->in_downcall);
+		list_add(&gss_msg->list, &pipe->in_downcall);
 	} else
 		gss_msg = old;
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 	return gss_msg;
 }
 
···
 static void
 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
 {
-	struct rpc_inode *rpci = gss_msg->inode;
+	struct rpc_pipe *pipe = gss_msg->pipe;
 
 	if (list_empty(&gss_msg->list))
 		return;
-	spin_lock(&rpci->pipe->lock);
+	spin_lock(&pipe->lock);
 	if (!list_empty(&gss_msg->list))
 		__gss_unhash_msg(gss_msg);
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 }
 
 static void
···
 	struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
 			struct gss_cred, gc_base);
 	struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
-	struct rpc_inode *rpci = gss_msg->inode;
+	struct rpc_pipe *pipe = gss_msg->pipe;
 
-	spin_lock(&rpci->pipe->lock);
+	spin_lock(&pipe->lock);
 	gss_handle_downcall_result(gss_cred, gss_msg);
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 	task->tk_status = gss_msg->msg.errno;
 	gss_release_msg(gss_msg);
 }
···
 		kfree(gss_msg);
 		return ERR_PTR(vers);
 	}
-	gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode);
+	gss_msg->pipe = RPC_I(gss_auth->dentry[vers]->d_inode)->pipe;
 	INIT_LIST_HEAD(&gss_msg->list);
 	rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
 	init_waitqueue_head(&gss_msg->waitqueue);
···
 		return gss_new;
 	gss_msg = gss_add_msg(gss_new);
 	if (gss_msg == gss_new) {
-		int res = rpc_queue_upcall(gss_new->inode->pipe, &gss_new->msg);
+		int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
 		if (res) {
 			gss_unhash_msg(gss_new);
 			gss_msg = ERR_PTR(res);
···
 	struct gss_cred *gss_cred = container_of(cred,
 			struct gss_cred, gc_base);
 	struct gss_upcall_msg *gss_msg;
-	struct rpc_inode *rpci;
+	struct rpc_pipe *pipe;
 	int err = 0;
 
 	dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid,
···
 		err = PTR_ERR(gss_msg);
 		goto out;
 	}
-	rpci = gss_msg->inode;
-	spin_lock(&rpci->pipe->lock);
+	pipe = gss_msg->pipe;
+	spin_lock(&pipe->lock);
 	if (gss_cred->gc_upcall != NULL)
 		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
 	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
···
 		gss_handle_downcall_result(gss_cred, gss_msg);
 		err = gss_msg->msg.errno;
 	}
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 	gss_release_msg(gss_msg);
 out:
 	dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
···
 static inline int
 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
 {
-	struct rpc_inode *rpci;
+	struct rpc_pipe *pipe;
 	struct rpc_cred *cred = &gss_cred->gc_base;
 	struct gss_upcall_msg *gss_msg;
 	DEFINE_WAIT(wait);
···
 		err = PTR_ERR(gss_msg);
 		goto out;
 	}
-	rpci = gss_msg->inode;
+	pipe = gss_msg->pipe;
 	for (;;) {
 		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
-		spin_lock(&rpci->pipe->lock);
+		spin_lock(&pipe->lock);
 		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
 			break;
 		}
-		spin_unlock(&rpci->pipe->lock);
+		spin_unlock(&pipe->lock);
 		if (fatal_signal_pending(current)) {
 			err = -ERESTARTSYS;
 			goto out_intr;
···
 		gss_cred_set_ctx(cred, gss_msg->ctx);
 	else
 		err = gss_msg->msg.errno;
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 out_intr:
 	finish_wait(&gss_msg->waitqueue, &wait);
 	gss_release_msg(gss_msg);
···
 	const void *p, *end;
 	void *buf;
 	struct gss_upcall_msg *gss_msg;
-	struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode);
+	struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe;
 	struct gss_cl_ctx *ctx;
 	uid_t uid;
 	ssize_t err = -EFBIG;
···
 
 	err = -ENOENT;
 	/* Find a matching upcall */
-	spin_lock(&rpci->pipe->lock);
-	gss_msg = __gss_find_upcall(rpci, uid);
+	spin_lock(&pipe->lock);
+	gss_msg = __gss_find_upcall(pipe, uid);
 	if (gss_msg == NULL) {
-		spin_unlock(&rpci->pipe->lock);
+		spin_unlock(&pipe->lock);
 		goto err_put_ctx;
 	}
 	list_del_init(&gss_msg->list);
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 
 	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
 	if (IS_ERR(p)) {
···
 	err = mlen;
 
 err_release_msg:
-	spin_lock(&rpci->pipe->lock);
+	spin_lock(&pipe->lock);
 	__gss_unhash_msg(gss_msg);
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 	gss_release_msg(gss_msg);
 err_put_ctx:
 	gss_put_ctx(ctx);
···
 static void
 gss_pipe_release(struct inode *inode)
 {
-	struct rpc_inode *rpci = RPC_I(inode);
+	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
 	struct gss_upcall_msg *gss_msg;
 
 restart:
-	spin_lock(&rpci->pipe->lock);
-	list_for_each_entry(gss_msg, &rpci->pipe->in_downcall, list) {
+	spin_lock(&pipe->lock);
+	list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
 
 		if (!list_empty(&gss_msg->msg.list))
 			continue;
 		gss_msg->msg.errno = -EPIPE;
 		atomic_inc(&gss_msg->count);
 		__gss_unhash_msg(gss_msg);
-		spin_unlock(&rpci->pipe->lock);
+		spin_unlock(&pipe->lock);
 		gss_release_msg(gss_msg);
 		goto restart;
 	}
-	spin_unlock(&rpci->pipe->lock);
+	spin_unlock(&pipe->lock);
 
 	put_pipe_version();
 }