netdev - [RFC PATCH 08/53] netfs: Add rsize to netfs_io

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Date: Fri, 13 Oct 2023 17:03:37 +0100
From: David Howells <dhowells@...hat.com>
To: Jeff Layton <jlayton@...nel.org>,
	Steve French <smfrench@...il.com>
Cc: David Howells <dhowells@...hat.com>,
	Matthew Wilcox <willy@...radead.org>,
	Marc Dionne <marc.dionne@...istor.com>,
	Paulo Alcantara <pc@...guebit.com>,
	Shyam Prasad N <sprasad@...rosoft.com>,
	Tom Talpey <tom@...pey.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Ilya Dryomov <idryomov@...il.com>,
	Christian Brauner <christian@...uner.io>,
	linux-afs@...ts.infradead.org,
	linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	ceph-devel@...r.kernel.org,
	v9fs@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-cachefs@...hat.com
Subject: [RFC PATCH 08/53] netfs: Add rsize to netfs_io_request

Add an rsize parameter to netfs_io_request to be filled in by the network
filesystem when the request is initialised.  This indicates the maximum
size of a read request that the netfs will honour in that region.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: linux-cachefs@...hat.com
cc: linux-fsdevel@...r.kernel.org
cc: linux-mm@...ck.org
---
 fs/afs/file.c         | 1 +
 fs/ceph/addr.c        | 2 ++
 include/linux/netfs.h | 1 +
 3 files changed, 4 insertions(+)

diff --git a/fs/afs/file.c b/fs/afs/file.c
index 3fea5cd8ef13..3d2e1913ea27 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -360,6 +360,7 @@ static int afs_symlink_read_folio(struct file *file, struct folio *folio)
 static int afs_init_request(struct netfs_io_request *rreq, struct file *file)
 {
 	rreq->netfs_priv = key_get(afs_file_key(file));
+	rreq->rsize = 4 * 1024 * 1024;
 	return 0;
 }
 
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index ced19ff08988..92a5ddcd9a76 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -419,6 +419,8 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
 	struct ceph_netfs_request_data *priv;
 	int ret = 0;
 
+	rreq->rsize = 1024 * 1024;
+
 	if (rreq->origin != NETFS_READAHEAD)
 		return 0;
 
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index daa431c4148d..02e888c170da 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -188,6 +188,7 @@ struct netfs_io_request {
 	struct list_head	subrequests;	/* Contributory I/O operations */
 	void			*netfs_priv;	/* Private data for the netfs */
 	unsigned int		debug_id;
+	unsigned int		rsize;		/* Maximum read size (0 for none) */
 	atomic_t		nr_outstanding;	/* Number of ops in progress */
 	atomic_t		nr_copy_ops;	/* Number of copy-to-cache ops in progress */
 	size_t			submitted;	/* Amount submitted for I/O so far */