SUNRPC: Clean up the sillyrename code

Fix a couple of bugs:
 - Don't rely on the parent dentry still being valid when the call completes.
   Fixes a race with shrink_dcache_for_umount_subtree()

 - Don't remove the file if the filehandle has been labelled as stale.

Fix a couple of inefficiencies
 - Remove the global list of sillyrenamed files. Instead we can cache the
   sillyrename information in the dentry->d_fsdata
 - Move common code from unlink_setup/unlink_done into fs/nfs/unlink.c

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

1 files changed, 9 insertions, 29 deletions

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index eac07f2c99d..c7ca5d70870 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -370,41 +370,21 @@ nfs3_proc_remove(struct inode *dir, struct qstr *name)
 	return status;
 }
 
-static int
-nfs3_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
+static void
+nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
 {
-	struct unlinkxdr {
-		struct nfs_removeargs arg;
-		struct nfs_removeres res;
-	} *ptr;
-
-	ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return -ENOMEM;
-	ptr->arg.fh = NFS_FH(dir->d_inode);
-	ptr->arg.name.name = name->name;
-	ptr->arg.name.len = name->len;
-	nfs_fattr_init(&ptr->res.dir_attr);
 	msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
-	msg->rpc_argp = &ptr->arg;
-	msg->rpc_resp = &ptr->res;
-	return 0;
 }
 
 static int
-nfs3_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
+nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
 {
-	struct rpc_message *msg = &task->tk_msg;
-	struct nfs_fattr	*dir_attr;
-
-	if (nfs3_async_handle_jukebox(task, dir->d_inode))
-		return 1;
-	if (msg->rpc_argp) {
-		dir_attr = &((struct nfs_removeres*)msg->rpc_resp)->dir_attr;
-		nfs_post_op_update_inode(dir->d_inode, dir_attr);
-		kfree(msg->rpc_argp);
-	}
-	return 0;
+	struct nfs_removeres *res;
+	if (nfs3_async_handle_jukebox(task, dir))
+		return 0;
+	res = task->tk_msg.rpc_resp;
+	nfs_post_op_update_inode(dir, &res->dir_attr);
+	return 1;
 }
 
 static int