linux-kernel - [PATCH v2 11/25] netfs: Use bh-disabling spinlocks for rreq->lock

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Message-ID: <20240814203850.2240469-12-dhowells@redhat.com>
Date: Wed, 14 Aug 2024 21:38:31 +0100
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>,
	Steve French <smfrench@...il.com>,
	Matthew Wilcox <willy@...radead.org>
Cc: David Howells <dhowells@...hat.com>,
	Jeff Layton <jlayton@...nel.org>,
	Gao Xiang <hsiangkao@...ux.alibaba.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Marc Dionne <marc.dionne@...istor.com>,
	Paulo Alcantara <pc@...guebit.com>,
	Shyam Prasad N <sprasad@...rosoft.com>,
	Tom Talpey <tom@...pey.com>,
	Eric Van Hensbergen <ericvh@...nel.org>,
	Ilya Dryomov <idryomov@...il.com>,
	netfs@...ts.linux.dev,
	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-erofs@...ts.ozlabs.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 11/25] netfs: Use bh-disabling spinlocks for rreq->lock

Use bh-disabling spinlocks when accessing rreq->lock because, in the
future, it may be twiddled from softirq context when cleanup is driven from
cache backend DIO completion.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
---
 fs/netfs/write_collect.c | 4 ++--
 fs/netfs/write_issue.c   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c
index e105ac270090..5f504b03a1e7 100644
--- a/fs/netfs/write_collect.c
+++ b/fs/netfs/write_collect.c
@@ -466,7 +466,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
 
 		cancel:
 			/* Remove if completely consumed. */
-			spin_lock(&wreq->lock);
+			spin_lock_bh(&wreq->lock);
 
 			remove = front;
 			list_del_init(&front->rreq_link);
@@ -482,7 +482,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
 				}
 			}
 
-			spin_unlock(&wreq->lock);
+			spin_unlock_bh(&wreq->lock);
 			netfs_put_subrequest(remove, false,
 					     notes & SAW_FAILURE ?
 					     netfs_sreq_trace_put_cancel :
diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index 41db709ca1d3..7880a586343f 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -191,7 +191,7 @@ static void netfs_prepare_write(struct netfs_io_request *wreq,
 	 * the list.  The collector only goes nextwards and uses the lock to
 	 * remove entries off of the front.
 	 */
-	spin_lock(&wreq->lock);
+	spin_lock_bh(&wreq->lock);
 	list_add_tail(&subreq->rreq_link, &stream->subrequests);
 	if (list_is_first(&subreq->rreq_link, &stream->subrequests)) {
 		stream->front = subreq;
@@ -202,7 +202,7 @@ static void netfs_prepare_write(struct netfs_io_request *wreq,
 		}
 	}
 
-	spin_unlock(&wreq->lock);
+	spin_unlock_bh(&wreq->lock);
 
 	stream->construct = subreq;
 }