nfs: abstract out code needed to complete a sillyrename

The async rename code is currently "polluted" with some parts that are
really just for sillyrenames. Add a new "complete" operation vector to
the nfs_renamedata to separate out the stuff that just needs to be done
for a sillyrename.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Anna Schumaker <Anna.Schumaker@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 18 insertions, 4 deletions

diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 11d78944de79..3e6798c9ba1f 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -353,8 +353,8 @@ static void nfs_async_rename_done(struct rpc_task *task, void *calldata)
                 return;
         }
 
-        if (task->tk_status != 0)
-                nfs_cancel_async_unlink(old_dentry);
+        if (data->complete)
+                data->complete(task, data);
 }
 
 /**
@@ -401,7 +401,8 @@ static const struct rpc_call_ops nfs_rename_ops = {
  */
 static struct rpc_task *
 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
-                 struct dentry *old_dentry, struct dentry *new_dentry)
+                 struct dentry *old_dentry, struct dentry *new_dentry,
+                 void (*complete)(struct rpc_task *, struct nfs_renamedata *))
 {
         struct nfs_renamedata *data;
         struct rpc_message msg = { };
@@ -438,6 +439,7 @@ nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
         data->new_dentry = dget(new_dentry);
         nfs_fattr_init(&data->old_fattr);
         nfs_fattr_init(&data->new_fattr);
+        data->complete = complete;
 
         /* set up nfs_renameargs */
         data->args.old_dir = NFS_FH(old_dir);
@@ -456,6 +458,17 @@ nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
         return rpc_run_task(&task_setup_data);
 }
 
+/*
+ * Perform tasks needed when a sillyrename is done such as cancelling the
+ * queued async unlink if it failed.
+ */
+static void
+nfs_complete_sillyrename(struct rpc_task *task, struct nfs_renamedata *data)
+{
+        if (task->tk_status != 0)
+                nfs_cancel_async_unlink(data->old_dentry);
+}
+
 #define SILLYNAME_PREFIX ".nfs"
 #define SILLYNAME_PREFIX_LEN ((unsigned)sizeof(SILLYNAME_PREFIX) - 1)
 #define SILLYNAME_FILEID_LEN ((unsigned)sizeof(u64) << 1)
@@ -548,7 +561,8 @@ nfs_sillyrename(struct inode *dir, struct dentry *dentry)
         }
 
         /* run the rename task, undo unlink if it fails */
-        task = nfs_async_rename(dir, dir, dentry, sdentry);
+        task = nfs_async_rename(dir, dir, dentry, sdentry,
+                                        nfs_complete_sillyrename);
         if (IS_ERR(task)) {
                 error = -EBUSY;
                 nfs_cancel_async_unlink(dentry);