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-rw-r--r--net/sunrpc/rpc_pipe.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index b181e3441323..bfddd68b31d3 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -77,6 +77,26 @@ rpc_timeout_upcall_queue(struct work_struct *work)
rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
}
+ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
+ char __user *dst, size_t buflen)
+{
+ char *data = (char *)msg->data + msg->copied;
+ size_t mlen = min(msg->len - msg->copied, buflen);
+ unsigned long left;
+
+ left = copy_to_user(dst, data, mlen);
+ if (left == mlen) {
+ msg->errno = -EFAULT;
+ return -EFAULT;
+ }
+
+ mlen -= left;
+ msg->copied += mlen;
+ msg->errno = 0;
+ return mlen;
+}
+EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall);
+
/**
* rpc_queue_upcall - queue an upcall message to userspace
* @inode: inode of upcall pipe on which to queue given message
@@ -1084,3 +1104,6 @@ void unregister_rpc_pipefs(void)
kmem_cache_destroy(rpc_inode_cachep);
unregister_filesystem(&rpc_pipe_fs_type);
}
+
+/* Make 'mount -t rpc_pipefs ...' autoload this module. */
+MODULE_ALIAS("rpc_pipefs");