[PATCH 6/7] xfs: Block writes to log device

From: Jan Kara <jack@suse.cz>
To: Christian Brauner <brauner@kernel.org>
Cc: <linux-fsdevel@vger.kernel.org>, <linux-block@vger.kernel.org>,
	Jens Axboe <axboe@kernel.dk>,
	Christoph Hellwig <hch@infradead.org>,
	Kees Cook <keescook@google.com>,
	syzkaller <syzkaller@googlegroups.com>,
	Alexander Popov <alex.popov@linux.com>,
	<linux-xfs@vger.kernel.org>, Dmitry Vyukov <dvyukov@google.com>,
	Jan Kara <jack@suse.cz>, "Darrick J . Wong" <djwong@kernel.org>
Subject: [PATCH 6/7] xfs: Block writes to log device
Date: Wed,  1 Nov 2023 18:43:11 +0100	[thread overview]
Message-ID: <20231101174325.10596-6-jack@suse.cz> (raw)
In-Reply-To: <20231101173542.23597-1-jack@suse.cz>

Ask block layer to not allow other writers to open block devices used
for xfs log and realtime devices.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/xfs/xfs_super.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 84107d162e41..2f29a6810e6a 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -365,8 +365,9 @@ xfs_blkdev_get(
 {
 	int			error = 0;
 
-	*handlep = bdev_open_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
-				     mp->m_super, &fs_holder_ops);
+	*handlep = bdev_open_by_path(name,
+		BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,
+		mp->m_super, &fs_holder_ops);
 	if (IS_ERR(*handlep)) {
 		error = PTR_ERR(*handlep);
 		*handlep = NULL;
-- 
2.35.3

