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 X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB8D5C432BE for ; Thu, 19 Aug 2021 12:27:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE91B6113E for ; Thu, 19 Aug 2021 12:27:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238916AbhHSM1v (ORCPT ); Thu, 19 Aug 2021 08:27:51 -0400 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:46871 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238878AbhHSM1u (ORCPT ); Thu, 19 Aug 2021 08:27:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1629376033; x=1660912033; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=r50VGNZnDSTv3Op3HS5vNfZct0dafhEDRNdXuDHct28=; b=Az6ysMzd2NCC/j9fTUldrdEWmmuoIDFBOmg2Bjq0g213dO6oyu+UNJBE aZOaplVjSc7hYoBkO0EJjooUOfyVjXN1/GiO9w2+6ZgGxoV1jJk/rchqy VymupPV0X6NPWggyNFOOVh11Z5raPpLIxNvLX9OFkvxKUBEsDgFnyZyls TXkazC/TX3Mnfb2vzmOnO0kvTByMDLr+fVASeKbVK/eUqY7lQnBCY1k9O /gXxU8ECgBFPmDEwTP5OGEpQUYSGkaijpmmAhmeW3f2rlLeIoq3X868cj dxQA2zczZc/6+58D9yaDWqiz+G2bL1Qq0hp7UqyCDYJgmMffP61RXZMJ8 g==; X-IronPort-AV: E=Sophos;i="5.84,334,1620662400"; d="scan'208";a="177773559" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 19 Aug 2021 20:27:13 +0800 IronPort-SDR: vpMy3wEt04JgyLMwNe6xPedJRcp8gK5uxTkv8GReBnwsnelAC0nA7OmHsWoaMnICojAsZz6Lwi mjxRv+Od9oANdmN9xnfZZ1ClxK1l7ppu/V6AzR3fOQBMJTUfT8mqLvJxRFKGYc78hmAp7j+jzk Xue5Zl5G+WRH3RQnX86hQ4oxfPj6+DJUYo+vrAo9nx+xG7eeV/Df1mi8C2H2rCnGBTZrctaI90 EHmghgMT78lA8GG9ieNASrAlNeR6wuS9uvANCcE/nbTxb2Yu1ki3wWW9hsIgXOCJ/LgBMYotec xNLs9zOCrWNfQMSUI8iDc010 Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2021 05:04:22 -0700 IronPort-SDR: FA519rt2vDcK+0MjzzDHZfkIyfgKVjKO43U6yuNi/MpIctSvyx0rznFa/820/0lmKUeRsiVZfD hKIpMuvaaJXaAGXmAgkLPDId07GxC6+3cupOsst13sXpCx4ibXR2mc/34cQ3bNGJtddF/wsFDU ntLPHCg5itTSxtxCh0Xda1N1F+9CSMZ7kDg97zMeU+o8nFOuJPibXLPrD34+lri+mxN99t9l7j 4eEltewqwtEX9k+qN2dj5SHnovGXIp/ACzYpJmc/rROip68GZgsG6yw3QF4c9wWKQhJ0RO+iL1 52k= WDCIronportException: Internal Received: from gkg9hr2.ad.shared (HELO naota-xeon.wdc.com) ([10.225.52.110]) by uls-op-cesaip02.wdc.com with ESMTP; 19 Aug 2021 05:27:13 -0700 From: Naohiro Aota To: David Sterba , Josef Bacik Cc: linux-btrfs@vger.kernel.org, Naohiro Aota Subject: [PATCH v2 06/17] btrfs: zoned: locate superblock position using zone capacity Date: Thu, 19 Aug 2021 21:19:13 +0900 Message-Id: <98720a3c02feebaaa8810ad3dbfde1717bd1acfa.1629349224.git.naohiro.aota@wdc.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org sb_write_pointer() returns the write position of next superblock. For READ, we need a previous location. When the pointer is at the head, the previous one is the last one of the other zone. Calculate the last one's position from zone capacity. Signed-off-by: Naohiro Aota --- fs/btrfs/zoned.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index d20c97395a70..188a4ebefe59 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -683,9 +683,20 @@ static int sb_log_location(struct block_device *bdev, struct blk_zone *zones, reset->wp = reset->start; } } else if (ret != -ENOENT) { - /* For READ, we want the precious one */ + /* + * For READ, we want the previous one. Move write pointer + * to the end of a zone, if it is at the head of a zone. + */ + u64 zone_end = 0; + if (wp == zones[0].start << SECTOR_SHIFT) - wp = (zones[1].start + zones[1].len) << SECTOR_SHIFT; + zone_end = zones[1].start + zones[1].capacity; + else if (wp == zones[1].start << SECTOR_SHIFT) + zone_end = zones[0].start + zones[0].capacity; + if (zone_end) + wp = ALIGN_DOWN(zone_end << SECTOR_SHIFT, + BTRFS_SUPER_INFO_SIZE); + wp -= BTRFS_SUPER_INFO_SIZE; } -- 2.33.0