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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-48e481c7084si29066407f8f.389.2026.10.29.07.08.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 07:08:14 -0700 (PDT) Received-SPF: pass (google.com: domain of andrey.zhadchenko@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b=nnu4f5sG; spf=pass (google.com: domain of andrey.zhadchenko@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=andrey.zhadchenko@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=MIME-Version:Message-ID:Date:Subject:From: Content-Type; bh=qE0sr3rDLZ8lBGgegAEYLXiCgRRNPn96wbD+2fV1sOI=; b=nnu4f5sG02+o sNsgVeVuLc3FVum1GU2pBQqTLFSxb37f12DZY+iehj/RvKNi1Ly2WbTQCmfe8mDIEswAbeq6TRDZh 6eLI89mQhxhzyl5z4faxfcO5U8EaHrZDLDAgVgRDp+nLodMbTpDZpX5ntcQhVFGP4Jb+cXsV+WVWj j679ZVYHo+PxyrNFUE1KC85f6ttSs2qF90chMqAKjR356Yzpqp+/QRIc8KzLB+9Xzj2FIiqfHv7pX llTFGpYNQqviNzgtDNjv+kNiR8DADLC9FIzESuDnfPBR6/g2o1w4mn2cnlRJ7Cvf1hn+5xFnNEbeI Ji6+SIRmztOvjtptAV/gDA==; Received: from [130.117.225.5] (helo=vz9-demens-1.aci.vzint.dev) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1xMQjp-006pKz-2u; Thu, 29 Oct 2026 15:08:11 +0100 From: Andrey Zhadchenko To: ptikhomirov@virtuozzo.com, alexander.ivanov@virtuozzo.com Date: Thu, 29 Oct 2026 17:03:40 +0300 Message-ID: <20261029140346.465768-2-andrey.zhadchenko@virtuozzo.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20261029140346.465768-1-andrey.zhadchenko@virtuozzo.com> References: <20261029140346.465768-1-andrey.zhadchenko@virtuozzo.com> MIME-Version: 1.0 X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 1/7] drivers/md/dm-qcow2: repeat md page lookup if it was inserted in parallel X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org teach __handle_md_page() to work around -EEXIST by retrying. https://virtuozzo.atlassian.net/browse/VSTOR-95494 Feature: dm-qcow2: block device over QCOW2 files driver Signed-off-by: Andrey Zhadchenko --- drivers/md/dm-qcow2-map.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/md/dm-qcow2-map.c b/drivers/md/dm-qcow2-map.c index 78ee7cf5e8817..fed6ce75e98ad 100644 --- a/drivers/md/dm-qcow2-map.c +++ b/drivers/md/dm-qcow2-map.c @@ -1596,20 +1596,23 @@ static int submit_read_md_page(struct qcow2 *qcow2, struct qio **qio, /* * This may be called with @qio == NULL, in case of we are * interesting in searching cached in memory md only. - * This is aimed to be called not only from main kwork - * for L1/L2 pages, so all callers looking for L1/L2 - * must care about submit_read_md_page() may return EEXIST. */ static int __handle_md_page(struct qcow2 *qcow2, u64 page_id, struct qio **qio, struct md_page **ret_md) { struct md_page *md; + int ret; lockdep_assert_held(&qcow2->md_pages_lock); +again: md = qcow2_md_page_find_or_postpone(qcow2, page_id, qio); if (!md) { - if (qio && *qio) - return submit_read_md_page(qcow2, qio, page_id); + if (qio && *qio) { + ret = submit_read_md_page(qcow2, qio, page_id); + if (unlikely(ret == -EEXIST)) + goto again; + return ret; + } return 0; } -- 2.43.5 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel