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 19EE1285CBC; Sun, 19 Apr 2026 03:09:54 +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=1776568195; cv=none; b=VR+o+DHXddogJPF/Pn3M3+Ji6ICpoWud7yfcFBfjrWETp7t+0Rg2jkVXmyf1Ys7RdwGIeheZJ1JWLTPKopPoyvZcbmSZbcmW5pZM+JwVfvLDMiKQruiSKFz4TUXMSaRb0NuNPgtiD7yaeKydKol4Ug7lFW1blbic+EijRe5wleU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776568195; c=relaxed/simple; bh=OttTssuGoEv5p/02S3gu0oa2pvZunOqNo6USFUQ4rYk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=m2NCKBQBwdHbIk/CEZaw0+zZO40yXGP2dM4HYmB20Gu6nP978R7lrC0T+LgCtjuesOK12oS/obcPuFlJEees9jF4zRnQWbS/fGdNrG3Nmq0Rfwc8/Sqsesn7TdINUJg2YUcp4vVmPLbgzA7qRRwX59JH/2BmqqHys4Myh9KvnKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57B8CC2BCB4; Sun, 19 Apr 2026 03:09:53 +0000 (UTC) From: Yu Kuai To: linux-raid@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Li Nan , Yu Kuai , Cheng Cheng Subject: [PATCH 00/19] md: support llbitmap reshape for raid10 and raid5 Date: Sun, 19 Apr 2026 11:09:23 +0800 Message-ID: <20260419030942.824195-1-yukuai@fnnas.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit llbitmap currently tracks one live bitmap geometry, but reshape needs old and new mapping to coexist until reshape completion. That breaks normal bitmap accounting in three places: - bios that cross reshape_position cannot be accounted as one bitmap range - checkpointed dirty state must move forward as reshape advances - interrupted reshape must resume with the same llbitmap interpretation after reassembly The main pieces are: - add bitmap-side range preparation so md core uses one bitmap API - split reshape-crossing bios in raid10/raid5 before bitmap accounting - let llbitmap stage target geometry and remap checkpointed bits in one bitmap - teach raid10/raid5 to provide exact old/new mapping and drive llbitmap reshape progress Validation Runtime: - custom QEMU llbitmap reshape matrix passed for raid10 and raid5: - expanded/changed bit-state checks with query_bit - cross-boundary writes during reshape - heavier raid5 write path that previously warned/crashed - degraded stop/assemble data verification after reshape - interrupted reshape stop/assemble/continue for raid10 and raid5 - mdadm test 02r5grow passed in disk mode The temporary query_bit validation hook is intentionally kept out of this submission series. Yu Kuai (19): md: add exact bitmap mapping and reshape hooks md: add helper to split bios at reshape offset md/md-llbitmap: track bitmap sync_size explicitly md/md-llbitmap: allocate page controls independently md/md-llbitmap: grow the page cache in place for reshape md/md-llbitmap: track target reshape geometry fields md/md-llbitmap: finish reshape geometry md/md-llbitmap: refuse reshape while llbitmap still needs sync md/md-llbitmap: add reshape range mapping helpers md/md-llbitmap: don't skip reshape ranges from bitmap state md/md-llbitmap: remap checkpointed bits as reshape progresses md/md-llbitmap: clamp state-machine walks to tracked bits md/raid10: reject llbitmap chunk shrink during reshape md/raid10: wire llbitmap reshape lifecycle md/raid10: split reshape bios before bitmap accounting md/raid5: add exact old and new llbitmap mapping helpers md/raid5: reject llbitmap chunk shrink during reshape md/raid5: wire llbitmap reshape lifecycle md/raid5: split reshape bios before bitmap accounting drivers/md/md-bitmap.c | 8 + drivers/md/md-bitmap.h | 7 + drivers/md/md-llbitmap.c | 602 +++++++++++++++++++++++++++++++++++--- drivers/md/md.c | 51 +++ drivers/md/md.h | 8 + drivers/md/raid10.c | 44 ++- drivers/md/raid5.c | 114 ++++++-- 7 files changed, 760 insertions(+), 74 deletions(-) -- 2.51.0