[PATCH 3/6] xfs: Block writes to log device

From: Jan Kara <jack@suse.cz>
To: <linux-fsdevel@vger.kernel.org>
Cc: <linux-block@vger.kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	Christian Brauner <brauner@kernel.org>,
	Jens Axboe <axboe@kernel.dk>, Kees Cook <keescook@google.com>,
	Ted Tso <tytso@mit.edu>, syzkaller <syzkaller@googlegroups.com>,
	Alexander Popov <alex.popov@linux.com>,
	Eric Biggers <ebiggers@google.com>, <linux-xfs@vger.kernel.org>,
	linux-btrfs@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH 3/6] xfs: Block writes to log device
Date: Tue,  4 Jul 2023 14:56:51 +0200	[thread overview]
Message-ID: <20230704125702.23180-3-jack@suse.cz> (raw)
In-Reply-To: <20230704122727.17096-1-jack@suse.cz>

Ask block layer to not allow other writers to open block device used
for xfs log.

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 b0fbf8ea7846..3808b4507552 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -396,8 +396,9 @@ xfs_blkdev_get(
 {
 	int			error = 0;
 
-	*handlep = blkdev_get_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
-				      mp, &xfs_holder_ops);
+	*handlep = blkdev_get_by_path(name,
+			BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_BLOCK_WRITES,
+			mp, &xfs_holder_ops);
 	if (IS_ERR(*handlep)) {
 		error = PTR_ERR(*handlep);
 		xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
-- 
2.35.3

