SUNRPC: Add a field to track the number of kernel users of an rpc_pipe
This allows us to correctly deduce when we need to remove the pipe.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index e5fd796..e787b6a 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -737,6 +737,7 @@
dput (dentry);
dentry = ERR_PTR(-EBUSY);
}
+ rpci->nkern_readwriters++;
goto out;
}
inode = rpc_get_inode(dir->i_sb, S_IFIFO | S_IRUSR | S_IWUSR);
@@ -749,6 +750,7 @@
rpci->private = private;
rpci->flags = flags;
rpci->ops = ops;
+ rpci->nkern_readwriters = 1;
inode_dir_notify(dir, DN_CREATE);
dget(dentry);
out:
@@ -773,10 +775,12 @@
parent = dget_parent(dentry);
dir = parent->d_inode;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
- rpc_close_pipes(dentry->d_inode);
- error = simple_unlink(dir, dentry);
- if (!error)
- d_delete(dentry);
+ if (--RPC_I(dentry->d_inode)->nkern_readwriters == 0) {
+ rpc_close_pipes(dentry->d_inode);
+ error = simple_unlink(dir, dentry);
+ if (!error)
+ d_delete(dentry);
+ }
dput(dentry);
mutex_unlock(&dir->i_mutex);
dput(parent);