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=-13.6 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 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 20EA3C47089 for ; Thu, 27 May 2021 17:22:19 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C1F06613C0 for ; Thu, 27 May 2021 17:22:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C1F06613C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:53256 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lmJi6-0001Td-00 for qemu-devel@archiver.kernel.org; Thu, 27 May 2021 13:22:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52110) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lmJgS-0007Bt-Tt for qemu-devel@nongnu.org; Thu, 27 May 2021 13:20:36 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:21853) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lmJgR-0004qo-5t for qemu-devel@nongnu.org; Thu, 27 May 2021 13:20:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622136034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lXUmlBTMsiiuFXMdYtSCMSStnaQPkRXDY4eEYAzaYfs=; b=CYX58U/pO+zlrsy6hL+rK3Q95en+qL8WMp9blP9fO2BGd3P2xK/0Omc6GzYtEEr22gst6P XQn0qzn1x8S+9+UKWioefjKmXla7Pbq5KA6A6qGvrjztc9Y/TgfnsBUi8njItMF+VQAc+8 tr8g0qdZfUvAgekIovFfEup8QfxP78k= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-238-00M04-P0NPCaR0zvSKya4g-1; Thu, 27 May 2021 13:20:31 -0400 X-MC-Unique: 00M04-P0NPCaR0zvSKya4g-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 09B971858ED2; Thu, 27 May 2021 17:20:30 +0000 (UTC) Received: from thuth.com (ovpn-112-76.ams2.redhat.com [10.36.112.76]) by smtp.corp.redhat.com (Postfix) with ESMTP id 15D6960864; Thu, 27 May 2021 17:20:27 +0000 (UTC) From: Thomas Huth To: qemu-block@nongnu.org, Kevin Wolf , Max Reitz Subject: [PATCH 2/2] block/file-posix: Try other fallbacks after invalid FALLOC_FL_ZERO_RANGE Date: Thu, 27 May 2021 19:20:20 +0200 Message-Id: <20210527172020.847617-3-thuth@redhat.com> In-Reply-To: <20210527172020.847617-1-thuth@redhat.com> References: <20210527172020.847617-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.374, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrey Shinkevich , Viktor Mihajlovski , qemu-devel@nongnu.org, Christian Borntraeger Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" If fallocate(... FALLOC_FL_ZERO_RANGE ...) returns EINVAL, it's likely an indication that the file system is buggy and does not implement unaligned accesses right. We still might be lucky with the other fallback fallocate() calls later in this function, though, so we should not return immediately and try the others first. Since FALLOC_FL_ZERO_RANGE could also return EINVAL if the file descriptor is not a regular file, we ignore this filesystem bug silently, without printing an error message for the user. Signed-off-by: Thomas Huth --- block/file-posix.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 134ff01d82..a96b6fa8fb 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1625,17 +1625,17 @@ static int handle_aiocb_write_zeroes(void *opaque) if (s->has_write_zeroes) { int ret = do_fallocate(s->fd, FALLOC_FL_ZERO_RANGE, aiocb->aio_offset, aiocb->aio_nbytes); - if (ret == -EINVAL) { - /* - * Allow falling back to pwrite for file systems that - * do not support fallocate() for an unaligned byte range. - */ - return -ENOTSUP; - } - if (ret == 0 || ret != -ENOTSUP) { + if (ret == -ENOTSUP) { + s->has_write_zeroes = false; + } else if (ret == 0 || ret != -EINVAL) { return ret; } - s->has_write_zeroes = false; + /* + * Note: Some file systems do not like unaligned byte ranges, and + * return EINVAL in such a case, though they should not do it according + * to the man-page of fallocate(). Thus we simply ignore this return + * value and try the other fallbacks instead. + */ } #endif -- 2.27.0