netfs: Add a ->free_subrequest() op

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>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org

diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index c4229c5..1bd20bd 100644 (file)
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -145,6 +145,8 @@ 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 d6f2700..06f57d9 100644 (file)
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -214,6 +214,7 @@ 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);
 
        void (*expand_readahead)(struct netfs_io_request *rreq);
        bool (*clamp_length)(struct netfs_io_subrequest *subreq);