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-rw-r--r--include/linux/sunrpc/rpc_pipe_fs.h1
-rw-r--r--net/sunrpc/rpc_pipe.c22
2 files changed, 16 insertions, 7 deletions
diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index 51b977a4ca2..cea764c2359 100644
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -15,6 +15,7 @@ struct rpc_pipe_ops {
ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
ssize_t (*downcall)(struct file *, const char __user *, size_t);
void (*release_pipe)(struct inode *);
+ int (*open_pipe)(struct inode *);
void (*destroy_msg)(struct rpc_pipe_msg *);
};
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 55b2049834c..c9b57f47108 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -169,16 +169,24 @@ static int
rpc_pipe_open(struct inode *inode, struct file *filp)
{
struct rpc_inode *rpci = RPC_I(inode);
+ int first_open;
int res = -ENXIO;
mutex_lock(&inode->i_mutex);
- if (rpci->ops != NULL) {
- if (filp->f_mode & FMODE_READ)
- rpci->nreaders ++;
- if (filp->f_mode & FMODE_WRITE)
- rpci->nwriters ++;
- res = 0;
+ if (rpci->ops == NULL)
+ goto out;
+ first_open = rpci->nreaders == 0 && rpci->nwriters == 0;
+ if (first_open && rpci->ops->open_pipe) {
+ res = rpci->ops->open_pipe(inode);
+ if (res)
+ goto out;
}
+ if (filp->f_mode & FMODE_READ)
+ rpci->nreaders++;
+ if (filp->f_mode & FMODE_WRITE)
+ rpci->nwriters++;
+ res = 0;
+out:
mutex_unlock(&inode->i_mutex);
return res;
}
@@ -748,7 +756,7 @@ rpc_rmdir(struct dentry *dentry)
* @name: name of pipe
* @private: private data to associate with the pipe, for the caller's use
* @ops: operations defining the behavior of the pipe: upcall, downcall,
- * release_pipe, and destroy_msg.
+ * release_pipe, open_pipe, and destroy_msg.
* @flags: rpc_inode flags
*
* Data is made available for userspace to read by calls to