SUNRPC: Enable non-exclusive create in rpc_mkpipe()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 14 insertions, 4 deletions

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 2320f1e42da4..ebcb8053836e 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -621,7 +621,7 @@ __rpc_rmdir(struct inode *dir, struct dentry *dentry)
 }
 
 static struct dentry *
-rpc_lookup_create(struct dentry *parent, const char *name, int len)
+rpc_lookup_create(struct dentry *parent, const char *name, int len, int exclusive)
 {
         struct inode *dir = parent->d_inode;
         struct dentry *dentry;
@@ -630,7 +630,7 @@ rpc_lookup_create(struct dentry *parent, const char *name, int len)
         dentry = lookup_one_len(name, parent, len);
         if (IS_ERR(dentry))
                 goto out_err;
-        if (dentry->d_inode) {
+        if (dentry->d_inode && exclusive) {
                 dput(dentry);
                 dentry = ERR_PTR(-EEXIST);
                 goto out_err;
@@ -649,7 +649,7 @@ rpc_lookup_negative(char *path, struct nameidata *nd)
 
         if ((error = rpc_lookup_parent(path, nd)) != 0)
                 return ERR_PTR(error);
-        dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len);
+        dentry = rpc_lookup_create(nd->dentry, nd->last.name, nd->last.len, 1);
         if (IS_ERR(dentry))
                 rpc_release_path(nd);
         return dentry;
@@ -716,10 +716,20 @@ rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct rpc_pi
         struct inode *dir, *inode;
         struct rpc_inode *rpci;
 
-        dentry = rpc_lookup_create(parent, name, strlen(name));
+        dentry = rpc_lookup_create(parent, name, strlen(name), 0);
         if (IS_ERR(dentry))
                 return dentry;
         dir = parent->d_inode;
+        if (dentry->d_inode) {
+                rpci = RPC_I(dentry->d_inode);
+                if (rpci->private != private ||
+                                rpci->ops != ops ||
+                                rpci->flags != flags) {
+                        dput (dentry);
+                        dentry = ERR_PTR(-EBUSY);
+                }
+                goto out;
+        }
         inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR);
         if (!inode)
                 goto err_dput;