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authorPeng Tao <bergwolf@gmail.com>2011-09-22 21:50:10 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-10-18 09:08:12 -0700
commitc1225158a8dad9e9d5eee8a17dbbd9c7cda05ab9 (patch)
treeed543930670a47c3cb911d5580941584509b73f2 /net/sunrpc/rpc_pipe.c
parentfdc17abbc4b6094b34ee8ff5d91eaba8637594a2 (diff)
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SUNRPC/NFS: make rpc pipe upcall generic
The same function is used by idmap, gss and blocklayout code. Make it generic. Signed-off-by: Peng Tao <peng_tao@emc.com> Signed-off-by: Jim Rees <rees@umich.edu> Cc: stable@kernel.org [3.0] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
-rw-r--r--net/sunrpc/rpc_pipe.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index b181e344132..67dbc188438 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