Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
NFS: don't try to decode GETATTR if DELEGRETURN returned error
sunrpc: handle allocation errors from __rpc_lookup_create()
SUNRPC: Fix the return value of rpc_run_bc_task()
SUNRPC: Fix a use after free bug with the NFSv4.1 backchannel
SUNRPC: Fix a potential memory leak in auth_gss
NFS: Prevent another deadlock in nfs_release_page()

fs/nfs/file.c

···
 {
 	dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
 
-	if (gfp & __GFP_WAIT)
+	/* Only do I/O if gfp is a superset of GFP_KERNEL */
+	if ((gfp & GFP_KERNEL) == GFP_KERNEL)
 		nfs_wb_page(page->mapping->host, page);
 	/* If PagePrivate() is set, then the page is not freeable */
 	if (PagePrivate(page))

fs/nfs/nfs4xdr.c

···
 	if (status != 0)
 		goto out;
 	status = decode_delegreturn(&xdr);
+	if (status != 0)
+		goto out;
 	decode_getfattr(&xdr, res->fattr, res->server,
 			!RPC_IS_ASYNC(rqstp->rq_task));
 out:

include/linux/sunrpc/bc_xprt.h

···
 void xprt_free_bc_request(struct rpc_rqst *req);
 int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
 void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);
-void bc_release_request(struct rpc_task *);
 int bc_send(struct rpc_rqst *req);
 
 /*
···
 static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
 {
 	return 0;
+}
+
+static inline void xprt_free_bc_request(struct rpc_rqst *req)
+{
 }
 #endif /* CONFIG_NFS_V4_1 */
 #endif /* _LINUX_SUNRPC_BC_XPRT_H */

net/sunrpc/auth_gss/auth_gss.c

···
 	rqstp->rq_release_snd_buf = priv_release_snd_buf;
 	return 0;
 out_free:
-	for (i--; i >= 0; i--) {
-		__free_page(rqstp->rq_enc_pages[i]);
-	}
+	rqstp->rq_enc_pages_num = i;
+	priv_release_snd_buf(rqstp);
 out:
 	return -EAGAIN;
 }

net/sunrpc/bc_svc.c

···
 
 #define RPCDBG_FACILITY	RPCDBG_SVCDSP
 
-void bc_release_request(struct rpc_task *task)
-{
-	struct rpc_rqst *req = task->tk_rqstp;
-
-	dprintk("RPC:       bc_release_request: task= %p\n", task);
-
-	/*
-	 * Release this request only if it's a backchannel
-	 * preallocated request
-	 */
-	if (!bc_prealloc(req))
-		return;
-	xprt_free_bc_request(req);
-}
-
 /* Empty callback ops */
 static const struct rpc_call_ops nfs41_callback_ops = {
 };

net/sunrpc/clnt.c

···
 	task = rpc_new_task(&task_setup_data);
 	if (!task) {
 		xprt_free_bc_request(req);
+		task = ERR_PTR(-ENOMEM);
 		goto out;
 	}
 	task->tk_rqstp = req;

net/sunrpc/rpc_pipe.c

···
 	struct dentry *dentry;
 
 	dentry = __rpc_lookup_create(parent, name);
+	if (IS_ERR(dentry))
+		return dentry;
 	if (dentry->d_inode == NULL)
 		return dentry;
 	dput(dentry);

net/sunrpc/xprt.c

···
 
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/metrics.h>
+#include <linux/sunrpc/bc_xprt.h>
 
 #include "sunrpc.h"
 
···
 	if (req->rq_release_snd_buf)
 		req->rq_release_snd_buf(req);
 
-	/*
-	 * Early exit if this is a backchannel preallocated request.
-	 * There is no need to have it added to the RPC slot list.
-	 */
-	if (is_bc_request)
-		return;
-
-	memset(req, 0, sizeof(*req));	/* mark unused */
-
 	dprintk("RPC: %5u release request %p\n", task->tk_pid, req);
+	if (likely(!is_bc_request)) {
+		memset(req, 0, sizeof(*req));	/* mark unused */
 
-	spin_lock(&xprt->reserve_lock);
-	list_add(&req->rq_list, &xprt->free);
-	rpc_wake_up_next(&xprt->backlog);
-	spin_unlock(&xprt->reserve_lock);
+		spin_lock(&xprt->reserve_lock);
+		list_add(&req->rq_list, &xprt->free);
+		rpc_wake_up_next(&xprt->backlog);
+		spin_unlock(&xprt->reserve_lock);
+	} else
+		xprt_free_bc_request(req);
 }
 
 /**

net/sunrpc/xprtsock.c

···
 	.buf_free		= rpc_free,
 	.send_request		= xs_tcp_send_request,
 	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
-#if defined(CONFIG_NFS_V4_1)
-	.release_request	= bc_release_request,
-#endif /* CONFIG_NFS_V4_1 */
 	.close			= xs_tcp_close,
 	.destroy		= xs_destroy,
 	.print_stats		= xs_tcp_print_stats,