From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 319E338F629 for ; Sat, 28 Feb 2026 18:08:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302133; cv=none; b=FBz/IhigzPMzlOKo0W14/Fr5tzdCulcJxz3zoazmRhLdx4qVvrNaKZlnZyrO2cCSc08L2orwKsOyO/upXQfdvskLhDsU3qUhchtGEzM5c51uLRpYGc6PeOXWcr0V31Tj+4kcYLZLnbl/RhZq63svRelAvR2hPKTzsJHhg1LPHPM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302133; c=relaxed/simple; bh=FMvcOBzM6GVPkIBzfsmJlbbz4/gYc1gXPbsBpSae/TI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t+RVNALU6fjvqQf+5fPJ1rTpSHjrqUoInvwrlzhE3cBWP45UlCTXWiA88AdoW5k4nOwh6gykWaG9EAGib8EoeMNSIY4bXyQDDaJc3wsCjv9QZoW5+9O73+mwIGELmhY+wYLPu4IRsSezHaRZwA8Mst5/myi5BiVs2npEZd9Y5vc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Dk9L5e3L; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Dk9L5e3L" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9839FC19423; Sat, 28 Feb 2026 18:08:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302133; bh=FMvcOBzM6GVPkIBzfsmJlbbz4/gYc1gXPbsBpSae/TI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Dk9L5e3LI36/6dUgs55LGKPWyEtHK7UxE9cjZMn86PQDOXTPRFljTcZAzG7F45PEc ZkrhRelLeZhBMP8QcLr3ZOGxuFGNiSI2+5RXwRDywWO54f3xvPT9JK+AIyE1e2/qRw v8hfGC+rqUBn/wrKnMdV1dBE4sjRF7yM1qIQ6Ocj+n5dtNsugWUU0+Sk729VLClJzf qtgyVJXqbsC5JTFecg6a5vhlQmhKJiLTwG780RSJ912HFWBjR/qM6B2FlXnRehHlDZ c888YQ5KFoo/grbl0YnDS98yG1l9bF4sMLKUWOxYrE9RYRVQnqB1Cv9+8iX31MzgAL rGYkRWNj7lnCg== From: Sasha Levin To: patches@lists.linux.dev Cc: Mikulas Patocka , Zhihao Cheng , Sasha Levin Subject: [PATCH 6.6 124/283] dm: use bio_clone_blkg_association Date: Sat, 28 Feb 2026 13:04:26 -0500 Message-ID: <20260228180709.1583486-124-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228180709.1583486-1-sashal@kernel.org> References: <20260228180709.1583486-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Mikulas Patocka [ Upstream commit 2df8b310bcfe76827fd71092f58a2493ee6590b0 ] The origin bio carries blk-cgroup information which could be set from foreground(task_css(css) - wbc->wb->blkcg_css), so the blkcg won't control buffer io since commit ca522482e3eaf ("dm: pass NULL bdev to bio_alloc_clone"). The synchronous io is still under control by blkcg, because 'bio->bi_blkg' is set by io submitting task which has been added into 'cgroup.procs'. Fix it by using bio_clone_blkg_association when submitting a cloned bio. Link: https://bugzilla.kernel.org/show_bug.cgi?id=220985 Fixes: ca522482e3eaf ("dm: pass NULL bdev to bio_alloc_clone") Reported-by: Zhihao Cheng Signed-off-by: Mikulas Patocka Tested-by: Zhihao Cheng Signed-off-by: Sasha Levin --- drivers/md/dm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f0c4c3553c016..1d03536fded00 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1363,6 +1363,8 @@ void dm_submit_bio_remap(struct bio *clone, struct bio *tgt_clone) if (!tgt_clone) tgt_clone = clone; + bio_clone_blkg_association(tgt_clone, io->orig_bio); + /* * Account io->origin_bio to DM dev on behalf of target * that took ownership of IO with DM_MAPIO_SUBMITTED. -- 2.51.0