From patchwork Tue Jun 11 05:19:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 804080 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 F0D02171085; Tue, 11 Jun 2024 05:20:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718083217; cv=none; b=Im3AsbqH5QbBpDs3YZhtw/CHLeGaUFZcrmvPCvpPk2hZ2+lYWWjZPuF0ZlnXE/AkxptYTC8P4/DlZJSrDmJBAPIDX3q7hTdiaYDDnCHUa8aOLqDSt9Uz92GHlqmF383pgLCnu8cT358BfdZ9wxJXx005I+TO06yFFUF1tma2/Hg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718083217; c=relaxed/simple; bh=S/6b5sxCWO/SsxQYV3O9B7nBiepd0zuCVrHiKDAZwx8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=P//q27bLvClZAiSb8v/Awch7HFMABL8NAXYlOve61nmklaeKheCRWow8b2G8Vyp+sxn6WgWUk6Yq5eVgX8jBb5xEgponnoEF2Rf4/LLw4d+eqt/0jub74UuA3B2ElDwgXfNRRnrLnaje1PqNdjwi84YrUW0APcuuFussxWdsEZc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=MgJCZXdC; arc=none smtp.client-ip=198.137.202.133 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="MgJCZXdC" 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:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=XX8OKzSF4I8HqKWv9CPGPzdF42TlXrJn92mCb7zGUpU=; b=MgJCZXdCXtq5WcrpKLj6n44BMN x7as6F25HhuflNiQsl6jB5W6Jl8Cql52H+wX7EAkBatRuj+eJQEWJ77tUg0C3taOh9WTyyJ5Bqsdi RXIGXMyVTRoSsh9a4uAfJCaQK5+FHeeQHkBBZE0YZA9FygNVsS+hGq+FQgsOMtLKMq7cOPugwuWbd nHgbDPqb89/cUkFHBBzn5P6ypmdPwRtPSnVwTBJUEpsncbavyujHEC5azlnNETobhWGFD7GOTUPkY 4mvSB/tNstXuD79kJeevqTycR98vtBAfM0kE9ci/1QpnRCn9+ZGtDS5u57IeabqphYzfqjxqKjOQg V0F/xAxw==; Received: from 2a02-8389-2341-5b80-cdb4-8e7d-405d-6b77.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:cdb4:8e7d:405d:6b77] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sGtvO-00000007R2v-03k6; Tue, 11 Jun 2024 05:20:02 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Geert Uytterhoeven , Richard Weinberger , Philipp Reisner , Lars Ellenberg , =?utf-8?q?Christoph_B=C3=B6hmwa?= =?utf-8?q?lder?= , 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 Subject: [PATCH 10/26] xen-blkfront: don't disable cache flushes when they fail Date: Tue, 11 Jun 2024 07:19:10 +0200 Message-ID: <20240611051929.513387-11-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240611051929.513387-1-hch@lst.de> References: <20240611051929.513387-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html blkfront always had a robust negotiation protocol for detecting a write cache. Stop simply disabling cache flushes when they fail as that is a grave error. Signed-off-by: Christoph Hellwig --- drivers/block/xen-blkfront.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 9b4ec3e4908cce..9794ac2d3299d1 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -982,18 +982,6 @@ static const char *flush_info(struct blkfront_info *info) return "barrier or flush: disabled;"; } -static void xlvbd_flush(struct blkfront_info *info) -{ - blk_queue_write_cache(info->rq, info->feature_flush ? true : false, - info->feature_fua ? true : false); - pr_info("blkfront: %s: %s %s %s %s %s %s %s\n", - info->gd->disk_name, flush_info(info), - "persistent grants:", info->feature_persistent ? - "enabled;" : "disabled;", "indirect descriptors:", - info->max_indirect_segments ? "enabled;" : "disabled;", - "bounce buffer:", info->bounce ? "enabled" : "disabled;"); -} - static int xen_translate_vdev(int vdevice, int *minor, unsigned int *offset) { int major; @@ -1162,7 +1150,15 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity, info->sector_size = sector_size; info->physical_sector_size = physical_sector_size; - xlvbd_flush(info); + blk_queue_write_cache(info->rq, info->feature_flush ? true : false, + info->feature_fua ? true : false); + + pr_info("blkfront: %s: %s %s %s %s %s %s %s\n", + info->gd->disk_name, flush_info(info), + "persistent grants:", info->feature_persistent ? + "enabled;" : "disabled;", "indirect descriptors:", + info->max_indirect_segments ? "enabled;" : "disabled;", + "bounce buffer:", info->bounce ? "enabled" : "disabled;"); if (info->vdisk_info & VDISK_READONLY) set_disk_ro(gd, 1); @@ -1622,13 +1618,6 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) info->gd->disk_name, op_name(bret.operation)); blkif_req(req)->error = BLK_STS_NOTSUPP; } - if (unlikely(blkif_req(req)->error)) { - if (blkif_req(req)->error == BLK_STS_NOTSUPP) - blkif_req(req)->error = BLK_STS_OK; - info->feature_fua = 0; - info->feature_flush = 0; - xlvbd_flush(info); - } fallthrough; case BLKIF_OP_READ: case BLKIF_OP_WRITE: