[PATCH 2/6] fs: Block writes to mounted block devices

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 2/6] fs: Block writes to mounted block devices
Date: Tue,  4 Jul 2023 14:56:50 +0200	[thread overview]
Message-ID: <20230704125702.23180-2-jack@suse.cz> (raw)
In-Reply-To: <20230704122727.17096-1-jack@suse.cz>

Ask block layer to block writes to block devices mounted by filesystems.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 include/linux/blkdev.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ca467525e6e4..a1fb90f3887e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1471,7 +1471,8 @@ struct blk_holder_ops {
  * as stored in sb->s_flags.
  */
 #define sb_open_mode(flags) \
-	(BLK_OPEN_READ | (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
+	(BLK_OPEN_READ | BLK_OPEN_BLOCK_WRITES | \
+	 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
 
 struct bdev_handle {
 	struct block_device *bdev;
-- 
2.35.3

