linux-kernel - [RFC PATCH 03/53] netfs: Note nonblockingness in the netfs_io

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Message-ID: <20231013160423.2218093-4-dhowells@redhat.com>
Date:   Fri, 13 Oct 2023 17:03:32 +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 03/53] netfs: Note nonblockingness in the netfs_io_request struct

Allow O_NONBLOCK to be noted in the netfs_io_request struct.  Also add a
flag, NETFS_RREQ_BLOCKED to record if we did block.

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/netfs/objects.c    | 2 ++
 include/linux/netfs.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index 85f428fc52e6..e41f9fc9bdd2 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -37,6 +37,8 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
 	INIT_LIST_HEAD(&rreq->subrequests);
 	refcount_set(&rreq->ref, 1);
 	__set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
+	if (file && file->f_flags & O_NONBLOCK)
+		__set_bit(NETFS_RREQ_NONBLOCK, &rreq->flags);
 	if (rreq->netfs_ops->init_request) {
 		ret = rreq->netfs_ops->init_request(rreq, file);
 		if (ret < 0) {
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 282511090ead..b92e982ac4a0 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -205,6 +205,8 @@ struct netfs_io_request {
 #define NETFS_RREQ_DONT_UNLOCK_FOLIOS	3	/* Don't unlock the folios on completion */
 #define NETFS_RREQ_FAILED		4	/* The request failed */
 #define NETFS_RREQ_IN_PROGRESS		5	/* Unlocked when the request completes */
+#define NETFS_RREQ_NONBLOCK		6	/* Don't block if possible (O_NONBLOCK) */
+#define NETFS_RREQ_BLOCKED		7	/* We blocked */
 	const struct netfs_request_ops *netfs_ops;
 };