From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3FA52C27C79 for ; Mon, 17 Jun 2024 10:36:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=PuLQz5fcUgt3MvpH4nHYFCNI7v2eAdJzeIa35iHQgeg=; b=hG1zPWVD3tNHqe451XrAwzR4bK rYuOeFP0NqmLeBHNJCaNzdLcTlu61gTmljfWpPw+z6L/9anWo4heHjROHFiVlhs2elBM1zgR/S5go c/iup5VACWIAzOn08Sppao/Oc2ysHHP2MRJeKAH+obdCtNlwgjblbExpNgFQWsqYVNqcTBGUVH6Ud vgxQAXQqCy4yF2tJ662ln0EQQevq7hLIF/P5Z9jnHvbFFoWLRUmf38Yv9eQWL3mOJ+bcsL1RzQkv6 yTxRLd0Cv9lwkOodCV/xd7/Pi7PzCTQEQxvDqJ5IwRII/u0YgOuSNVSEUeqCgKW8Y5zcq7sk1D2hG SenrV1Wg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJ9ia-0000000AHEe-20V3; Mon, 17 Jun 2024 10:36:08 +0000 Received: from smtp-out2.suse.de ([2a07:de40:b251:101:10:150:64:2]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJ9iX-0000000AHDp-0qFU; Mon, 17 Jun 2024 10:36:06 +0000 Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 75F3B5FECC; Mon, 17 Jun 2024 10:36:03 +0000 (UTC) Authentication-Results: smtp-out2.suse.de; none Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id D6842139AB; Mon, 17 Jun 2024 10:36:02 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id AHKOMJIRcGYTDAAAD6G6ig (envelope-from ); Mon, 17 Jun 2024 10:36:02 +0000 Message-ID: Date: Mon, 17 Jun 2024 12:36:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 13/26] block: move cache control settings out of queue->flags To: Christoph Hellwig , Jens Axboe Cc: Geert Uytterhoeven , Richard Weinberger , Philipp Reisner , Lars Ellenberg , =?UTF-8?Q?Christoph_B=C3=B6hmwalder?= , Josef Bacik , Ming Lei , "Michael S. Tsirkin" , Jason Wang , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Alasdair Kergon , Mike Snitzer , Mikulas Patocka , Song Liu , Yu Kuai , Vineeth Vijayan , "Martin K. Petersen" , linux-m68k@lists.linux-m68k.org, linux-um@lists.infradead.org, drbd-dev@lists.linbit.com, nbd@other.debian.org, linuxppc-dev@lists.ozlabs.org, ceph-devel@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, dm-devel@lists.linux.dev, linux-raid@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, nvdimm@lists.linux.dev, linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, Ulf Hansson References: <20240617060532.127975-1-hch@lst.de> <20240617060532.127975-14-hch@lst.de> Content-Language: en-US From: Hannes Reinecke In-Reply-To: <20240617060532.127975-14-hch@lst.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Queue-Id: 75F3B5FECC X-Rspamd-Action: no action X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240617_033605_414213_0B987520 X-CRM114-Status: GOOD ( 15.27 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On 6/17/24 08:04, Christoph Hellwig wrote: > Move the cache control settings into the queue_limits so that the flags > can be set atomically with the device queue frozen. > > Add new features and flags field for the driver set flags, and internal > (usually sysfs-controlled) flags in the block layer. Note that we'll > eventually remove enough field from queue_limits to bring it back to the > previous size. > > The disable flag is inverted compared to the previous meaning, which > means it now survives a rescan, similar to the max_sectors and > max_discard_sectors user limits. > > The FLUSH and FUA flags are now inherited by blk_stack_limits, which > simplified the code in dm a lot, but also causes a slight behavior > change in that dm-switch and dm-unstripe now advertise a write cache > despite setting num_flush_bios to 0. The I/O path will handle this > gracefully, but as far as I can tell the lack of num_flush_bios > and thus flush support is a pre-existing data integrity bug in those > targets that really needs fixing, after which a non-zero num_flush_bios > should be required in dm for targets that map to underlying devices. > > Signed-off-by: Christoph Hellwig > Acked-by: Ulf Hansson [mmc] > --- Reviewed-by: Hannes Reinecke Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich