From: Jan Kara <jack@suse.cz>
Date: Wed, 1 Nov 2023 17:43:10 +0000 (+0100)
Subject: fs: Block writes to mounted block devices
X-Git-Tag: v6.8-rc1~214^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6f861765464f43a71462d52026fbddfc858239a5;p=thirdparty%2Flinux.git

fs: Block writes to mounted block devices

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

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20231101174325.10596-5-jack@suse.cz
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0e0c0186aa321..9f6c3373f9fc5 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1494,7 +1494,8 @@ extern const struct blk_holder_ops fs_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_RESTRICT_WRITES | \
+	 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))
 
 struct bdev_handle {
 	struct block_device *bdev;