From patchwork Wed Nov 1 17:43:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13442960 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD22A18656 for ; Wed, 1 Nov 2023 17:43:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.cz header.i=@suse.cz header.b="qfnzs8DT"; dkim=permerror (0-bit key) header.d=suse.cz header.i=@suse.cz header.b="qNX80e5R" Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 56CFC115; Wed, 1 Nov 2023 10:43:33 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id B881A21A41; Wed, 1 Nov 2023 17:43:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1698860606; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BsxXilB8VtCWD9uJ48g6IisnMmSxhnqquY6XcPZlAKQ=; b=qfnzs8DT7yNoCyRCiEfgwweelCcCNnhDKYjy65J8od5FjaRZYtuQ+qQJhVUCDKTN3Ky0kS UhI8vabTpxc8luwHCzWIUJCnps+IwZP9QtTy5BDSSldLovGbrXcHaGu3Kf97dp+LDqjFD2 D4mtr1ewM2NojGSIJlu+zDox8YodfSM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1698860606; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BsxXilB8VtCWD9uJ48g6IisnMmSxhnqquY6XcPZlAKQ=; b=qNX80e5RN09U7lmTJyabsszy6iJuhCmAGejuFXQWPv9qncGkn6WSRUk3YoTtlkdm5lnPIT ozEvR31D4EutLUCg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id A9C821348D; Wed, 1 Nov 2023 17:43:26 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id d8FuKT6OQmUuYQAAMHmgww (envelope-from ); Wed, 01 Nov 2023 17:43:26 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id E3E89A076D; Wed, 1 Nov 2023 18:43:25 +0100 (CET) From: Jan Kara To: Christian Brauner Cc: , , Jens Axboe , Christoph Hellwig , Kees Cook , syzkaller , Alexander Popov , , Dmitry Vyukov , Jan Kara Subject: [PATCH 5/7] fs: Block writes to mounted block devices Date: Wed, 1 Nov 2023 18:43:10 +0100 Message-Id: <20231101174325.10596-5-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20231101173542.23597-1-jack@suse.cz> References: <20231101173542.23597-1-jack@suse.cz> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=744; i=jack@suse.cz; h=from:subject; bh=T/eItSVb7GcAYjznkgJHNYn7HD+3ITlTRTvdImRwJ2E=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBlQo4ubiwBwif8qp1536oKopFx3GfrPsJ5t7c/7aOj 1jG1waqJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZUKOLgAKCRCcnaoHP2RA2TkYCA DrJ56qaR1IQHLAf07UimuEs8suyyRufEgDz9zttWEJ7ZIIN0LmxsFinrw7ZJWHbbV/DrKpB0oeX/Uh xE8r6AHulGkMbasTJNABoZDxovW6HqZ8QEWh+1/RdG5p6NloxvvMCdDHILjDQwJtQN6eDfdGuAVjSI q3WTHOfnkh6x6cpuQWEUwTLQWm8FBAOb2sKa3PQaN2Qnus+ukMGqF0JZhX9JpkO46S9ielqaiW3ZUi xuyR4j/7LyNTtjxEDWuQwZT62dkwA3JgaNu6tr1+Gvc1svvBjzwVgf/8pldrHC3dC5i+lmG53BCZTx wzY85qVmI3fqOg587aQp0FyMKTd0oh X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Ask block layer to block writes to block devices mounted by filesystems. Signed-off-by: Jan Kara Reviewed-by: Christian Brauner --- 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 0e0c0186aa32..9f6c3373f9fc 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;