Commit cc3cb0a1 authored by David Howells's avatar David Howells
Browse files

netfs: Allow the netfs to make the io (sub)request alloc larger 



Allow the network filesystem to specify extra space to be allocated on the
end of the io (sub)request.  This allows cifs, for example, to use this
space rather than allocating its own cifs_readdata struct.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
parent 87b57a04

fs/netfs/objects.c

+5 −2
Original line number Diff line number Diff line
@@ -22,7 +22,8 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, 
	struct netfs_io_request *rreq;

	int ret;



	rreq = kzalloc(sizeof(struct netfs_io_request), GFP_KERNEL);

	rreq = kzalloc(ctx->ops->io_request_size ?: sizeof(struct netfs_io_request),

		       GFP_KERNEL);

	if (!rreq)

		return ERR_PTR(-ENOMEM);
@@ -114,7 +115,9 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq 
{

	struct netfs_io_subrequest *subreq;



	subreq = kzalloc(sizeof(struct netfs_io_subrequest), GFP_KERNEL);

	subreq = kzalloc(rreq->netfs_ops->io_subrequest_size ?:

			 sizeof(struct netfs_io_subrequest),

			 GFP_KERNEL);

	if (subreq) {

		INIT_LIST_HEAD(&subreq->rreq_link);

		refcount_set(&subreq->ref, 2);

include/linux/netfs.h

+2 −0
Original line number Diff line number Diff line
@@ -210,6 +210,8 @@ struct netfs_io_request { 
 * Operations the network filesystem can/must provide to the helpers.

 */

struct netfs_request_ops {

	unsigned int	io_request_size;	/* Alloc size for netfs_io_request struct */

	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);