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 EBA7536C9EB for ; Sat, 28 Feb 2026 18:12:56 +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=1772302377; cv=none; b=V3VbBuxD34R7BsP7/MNJVK/TpSG57WaJiZuRXwJx7/lAB1KygkvwwN9GmvzCbEf+i3XcndiaKRd9HigQEz1YSuBpqTSOlQBPHUKSujIw5p0vASD0FTkfU5S7CohVlxzJmfWTAZiCtNB4tbI/jJsx866MArRh6/1Lyxtl5sjsAAI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302377; c=relaxed/simple; bh=1RYyVlF1ePFbtHVtDLk2wp9y9r6xeScqaa9gDEC500k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PJ3vCkd0IjPitbJJyajV8vMe9T4FoqFURdy2LUxgiB8qtRLtVTTP10GM8UB3ezBAYpqV6SaNrRP76QUSsk6nfVw0wdzUz+2qtHsOypCDtWKPmttmp1Gw4xyBlCHj5n2dEqrMq5YQxbUJaT/ZJAbOIopTvfMppBkFTdSo1Kw6Fpc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=R2ER2XUE; 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="R2ER2XUE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26AC5C19423; Sat, 28 Feb 2026 18:12:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302376; bh=1RYyVlF1ePFbtHVtDLk2wp9y9r6xeScqaa9gDEC500k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=R2ER2XUEXnu8lDyfvd6oEcHzCBNZ9SIKjgcl4OAYiRnaD2uJBZzB9CsIshoHraci/ DCbU8/7M4HPSVIGmzGLrHUnN++rgrYU086kzf6K+cN0EfV9d6OSY5YJN/nImGDrqZj E0QoqBkFONKUAgb9hcnLj5LBmuuvBZAX/kQZGM/gLl55PIO7F+km6zIAK2dYyn16Tw WnmROdR25bTg1X5ZBY8ZtBrySkxuSApSrwb9tk9XJO+UwtPtjcDUwhOXmSDxbm859n POQ4CXXO2tVBHlFWdp1IEyaydsuZkxoK5POrMoP47H2O5pgZi+qWwZzEFkhygU17fl bDaL1UNfzp2/g== From: Sasha Levin To: patches@lists.linux.dev Cc: Mikulas Patocka , Zhihao Cheng , Sasha Levin Subject: [PATCH 6.1 104/232] dm: use bio_clone_blkg_association Date: Sat, 28 Feb 2026 13:09:17 -0500 Message-ID: <20260228181127.1592657-104-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228181127.1592657-1-sashal@kernel.org> References: <20260228181127.1592657-1-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 f745b9cf462aa..13225b7f11491 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1351,6 +1351,8 @@ 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