From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) by mail19.linbit.com (LINBIT Mail Daemon) with ESMTP id 87AAD420668 for ; Wed, 3 May 2023 14:20:25 +0200 (CEST) Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-3f19afc4fbfso50879175e9.2 for ; Wed, 03 May 2023 05:20:25 -0700 (PDT) From: =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= To: Jens Axboe Date: Wed, 3 May 2023 14:19:37 +0200 Message-Id: <20230503121937.17232-1-christoph.boehmwalder@linbit.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Christoph Hellwig , Thomas Voegtle , Philipp Reisner , stable@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Lars Ellenberg , drbd-dev@lists.linbit.com Subject: [Drbd-dev] [PATCH] drbd: correctly submit flush bio on barrier List-Id: "*Coordination* of development, patches, contributions -- *Questions* \(even to developers\) go to drbd-user, please." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , When we receive a flush command (or "barrier" in DRBD), we currently use a REQ_OP_FLUSH with the REQ_PREFLUSH flag set. The correct way to submit a flush bio is by using a REQ_OP_WRITE without any data, and set the REQ_PREFLUSH flag. Since commit b4a6bb3a67aa ("block: add a sanity check for non-write flush/fua bios"), this triggers a warning in the block layer, but this has been broken for quite some time before that. So use the correct set of flags to actually make the flush happen. Cc: Christoph Hellwig Cc: stable@vger.kernel.org Fixes: f9ff0da56437 ("drbd: allow parallel flushes for multi-volume resources") Reported-by: Thomas Voegtle Signed-off-by: Christoph Böhmwalder --- Previous, incorrect version of this patch: https://lore.kernel.org/all/20230502092922.175857-1-christoph.boehmwalder@linbit.com/ drivers/block/drbd/drbd_receiver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index e54404c632e7..34b112752ab1 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -1283,7 +1283,7 @@ static void one_flush_endio(struct bio *bio) static void submit_one_flush(struct drbd_device *device, struct issue_flush_context *ctx) { struct bio *bio = bio_alloc(device->ldev->backing_bdev, 0, - REQ_OP_FLUSH | REQ_PREFLUSH, GFP_NOIO); + REQ_OP_WRITE | REQ_PREFLUSH, GFP_NOIO); struct one_flush_context *octx = kmalloc(sizeof(*octx), GFP_NOIO); if (!octx) { -- 2.39.2