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[82.218.28.181]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43cf247079esm998990f8f.25.2026.03.27.15.38.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Mar 2026 15:38:52 -0700 (PDT) From: =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= To: Jens Axboe Cc: drbd-dev@lists.linbit.com, linux-kernel@vger.kernel.org, Lars Ellenberg , Philipp Reisner , linux-block@vger.kernel.org, =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= , Joel Colledge Subject: [PATCH 03/20] drbd: introduce DRBD 9 on-disk metadata format Date: Fri, 27 Mar 2026 23:38:03 +0100 Message-ID: <20260327223820.2244227-4-christoph.boehmwalder@linbit.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260327223820.2244227-1-christoph.boehmwalder@linbit.com> References: <20260327223820.2244227-1-christoph.boehmwalder@linbit.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Add a new header that captures the DRBD 9 on-disk metadata layout, enabling state tracking for mutiple peers. It includes the per-device superblock and per-peer slot structures needed to track bitmap UUIDs and sync state for each peer. Co-developed-by: Philipp Reisner Signed-off-by: Philipp Reisner Co-developed-by: Lars Ellenberg Signed-off-by: Lars Ellenberg Co-developed-by: Joel Colledge Signed-off-by: Joel Colledge Co-developed-by: Christoph B=C3=B6hmwalder Signed-off-by: Christoph B=C3=B6hmwalder --- drivers/block/drbd/drbd_meta_data.h | 126 ++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 drivers/block/drbd/drbd_meta_data.h diff --git a/drivers/block/drbd/drbd_meta_data.h b/drivers/block/drbd/drbd_= meta_data.h new file mode 100644 index 000000000000..af77e8d53f02 --- /dev/null +++ b/drivers/block/drbd/drbd_meta_data.h @@ -0,0 +1,126 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef DRBD_META_DATA_H +#define DRBD_META_DATA_H + +/* how I came up with this magic? + * base64 decode "actlog=3D=3D" ;) */ +#define DRBD_AL_MAGIC 0x69cb65a2 + +#define BM_BLOCK_SHIFT_4k 12 /* 4k per bit */ +#define BM_BLOCK_SHIFT_MIN BM_BLOCK_SHIFT_4k +#define BM_BLOCK_SHIFT_MAX 20 +#define BM_BLOCK_SIZE_4k 4096 +#define BM_BLOCK_SIZE_MIN (1<