NFS: Clean up nfs_sb_active/nfs_sb_deactive

Instead of causing umount requests to block on server->active_wq while the
asynchronous sillyrename deletes are executing, we can use the sb->s_active
counter to obtain a reference to the super_block, and then release that
reference in nfs_async_unlink_release().

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

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index f089e5839d7d..ecc295347775 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -99,7 +99,7 @@ static void nfs_async_unlink_release(void *calldata)
 
         nfs_dec_sillycount(data->dir);
         nfs_free_unlinkdata(data);
-        nfs_sb_deactive(NFS_SB(sb));
+        nfs_sb_deactive(sb);
 }
 
 static const struct rpc_call_ops nfs_unlink_ops = {
@@ -118,6 +118,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
                 .rpc_message = &msg,
                 .callback_ops = &nfs_unlink_ops,
                 .callback_data = data,
+                .workqueue = nfsiod_workqueue,
                 .flags = RPC_TASK_ASYNC,
         };
         struct rpc_task *task;
@@ -149,7 +150,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
                 nfs_dec_sillycount(dir);
                 return 0;
         }
-        nfs_sb_active(NFS_SERVER(dir));
+        nfs_sb_active(dir->i_sb);
         data->args.fh = NFS_FH(dir);
         nfs_fattr_init(&data->res.dir_attr);