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

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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: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
This commit is contained in:
David Howells
2022-03-09 11:01:12 +00:00
parent 87b57a0489
commit cc3cb0a18d
2 changed files with 7 additions and 2 deletions
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7
fs/netfs/objects.c
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@@ -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);