From mboxrd@z Thu Jan 1 00:00:00 1970 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.subspace.kernel.org (Postfix) with ESMTPS id 608DA44C99; Sun, 17 Dec 2023 16:54:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="WLAw68Jl" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=zthoML/uhpAs1hPvD/fh13swKppKnu7l7FTtACwvAxE=; b=WLAw68JlEwbNFdIQ2xyIscfsps CWgTZVnaIvQlWzz06TQgw+PjcgppWNTQHeaP9heFZI/N1X6bRYNdiDnf2HKguxboWjjhX0XmDtIjK Cfq3ixlcQVdCDmt8I6cHcZgfNphEKcI3/sVh25Wwnsz+IwF9FU+0k1hDj6q3C9Vdeme9/K9trDDqA V71hDtLh1lZVVWiDsNBiBlb8sihMmf06SvtbxGjuggJOMDbBBTxgpx44hH1dWWFQwYuZk0pKkO4pD z9I6Ggwwd4Bgt8+xX5UuHNQ6CBWHRRa61Hf3XU+/hpP1RR7WYzVz20j0J0IOo1IjoDdlSGlIKer06 t4lIRgSQ==; Received: from [88.128.92.84] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rEuOw-0088L9-1x; Sun, 17 Dec 2023 16:54:03 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Paolo Bonzini , Stefan Hajnoczi , Damien Le Moal , "Martin K. Petersen" , dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Subject: remove support for the host aware zoned model Date: Sun, 17 Dec 2023 17:53:54 +0100 Message-Id: <20231217165359.604246-1-hch@lst.de> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Hi all, hen zones were first added the SCSI and ATA specs, two different models were supported (in addition to the drive managed one that is invisible to the host): - host managed where non-conventional zones there is strict requirement to write at the write pointer, or else an error is returned - host aware where a write point is maintained if writes always happen at it, otherwise it is left in an under-defined state and the sequential write preferred zones behave like conventional zones (probably very badly performing ones, though) Not surprisingly this lukewarm model didn't prove to be very useful and was finally removed from the ZBC and SBC specs (NVMe never implemented it). Due to to the easily disappearing write pointer host software could never rely on the write pointer to actually be useful for say recovery. Fortunately only a few HDD prototypes shipped using this model which never made it to mass production. Drop the support before it is too late. Note that any such host aware prototype HDD can still be used with Linux as we'll now treat it as a conventional HDD. Diffstat: block/blk-settings.c | 83 +++++------------------------------------ block/blk-sysfs.c | 9 ---- block/blk-zoned.c | 3 - block/blk.h | 2 block/partitions/core.c | 12 ----- drivers/block/null_blk/zoned.c | 2 drivers/block/ublk_drv.c | 2 drivers/block/virtio_blk.c | 78 +++++++++++--------------------------- drivers/md/dm-kcopyd.c | 2 drivers/md/dm-table.c | 45 +++++++++------------- drivers/md/dm-zoned-metadata.c | 7 +-- drivers/md/dm-zoned-target.c | 4 - drivers/nvme/host/zns.c | 2 drivers/scsi/scsi_debug.c | 27 ++++++------- drivers/scsi/sd.c | 50 +++++++++++------------- drivers/scsi/sd_zbc.c | 16 ------- fs/btrfs/zoned.c | 23 +---------- fs/btrfs/zoned.h | 2 fs/f2fs/data.c | 2 fs/f2fs/super.c | 17 +++----- include/linux/blkdev.h | 38 +----------------- 21 files changed, 124 insertions(+), 302 deletions(-)