[RFC PATCH 05/53] netfs: Add a ->free_subrequest() op

[David Howells <dhowells@redhat.com>]

Add a ->free_subrequest() op so that the netfs can clean up data attached
to a subrequest.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
---
 fs/netfs/objects.c    | 2 ++
 include/linux/netfs.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index 2f1865ff7cce..8e92b8401aaa 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -147,6 +147,8 @@ static void netfs_free_subrequest(struct netfs_io_subrequest *subreq,
 	struct netfs_io_request *rreq = subreq->rreq;
 
 	trace_netfs_sreq(subreq, netfs_sreq_trace_free);
+	if (rreq->netfs_ops->free_subrequest)
+		rreq->netfs_ops->free_subrequest(subreq);
 	kfree(subreq);
 	netfs_stat_d(&netfs_n_rh_sreq);
 	netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 6942b8cf03dc..ed64d1034afa 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -218,6 +218,7 @@ struct netfs_request_ops {
 	unsigned int	io_subrequest_size;	/* Alloc size for netfs_io_subrequest struct */
 	int (*init_request)(struct netfs_io_request *rreq, struct file *file);
 	void (*free_request)(struct netfs_io_request *rreq);
+	void (*free_subrequest)(struct netfs_io_subrequest *rreq);
 	int (*begin_cache_operation)(struct netfs_io_request *rreq);
 
 	void (*expand_readahead)(struct netfs_io_request *rreq);