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Fri, 16 Apr 2021 01:23:47 -0400 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-582-e7oCOSnhMQeCIR0SktIzOw-1; Fri, 16 Apr 2021 01:23:40 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 00C9010053E7; Fri, 16 Apr 2021 05:23:39 +0000 (UTC) Received: from thuth.com (ovpn-112-57.ams2.redhat.com [10.36.112.57]) by smtp.corp.redhat.com (Postfix) with ESMTP id BBEC360BE5; Fri, 16 Apr 2021 05:23:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1618550626; 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; bh=94YNnwlE5i083urHtdcPMa2T+xLEiXKmxewj1HY9wcs=; b=Y7c9GI16emTVxA0mh1VB+A2Asu3uWhOBV4QaDS386lMWTE3t7mz6tjxHir5QwKX+49Nlcj PTDcZrtJlA3iByhdem9UWn2KbJ1ibnty6vzy/DNxjdXaf6hNIanhV9MB8UG2EMh0r9tMJw xWE13M1Gk7wiM33mhPwyB/F/ymCRwNk= X-MC-Unique: e7oCOSnhMQeCIR0SktIzOw-1 From: Thomas Huth To: qemu-block@nongnu.org, Kevin Wolf , Max Reitz Subject: [PATCH] block/file-posix: Fix problem with fallocate(PUNCH_HOLE) on GPFS Date: Fri, 16 Apr 2021 07:23:33 +0200 Message-Id: <20210416052333.1548853-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 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: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" A customer reported that running qemu-img convert -t none -O qcow2 -f qcow2 input.qcow2 output.qcow2 fails for them with the following error message when the images are stored on a GPFS file system: qemu-img: error while writing sector 0: Invalid argument After analyzing the strace output, it seems like the problem is in handle_aiocb_write_zeroes(): The call to fallocate(FALLOC_FL_PUNCH_HOLE) returns EINVAL, which can apparently happen if the file system has a different idea of the granularity of the operation. It's arguably a bug in GPFS, since the PUNCH_HOLE mode should not result in EINVAL according to the man-page of fallocate(), but the file system is out there in production and so we have to deal with it. In commit 294682cc3a ("block: workaround for unaligned byte range in fallocate()") we also already applied the a work-around for the same problem to the earlier fallocate(FALLOC_FL_ZERO_RANGE) call, so do it now similar with the PUNCH_HOLE call. Signed-off-by: Thomas Huth --- block/file-posix.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index 20e14f8e96..7a40428d52 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1675,6 +1675,13 @@ static int handle_aiocb_write_zeroes(void *opaque) } s->has_fallocate =3D false; } else if (ret !=3D -ENOTSUP) { + if (ret =3D=3D -EINVAL) { + /* + * File systems like GPFS do not like unaligned byte range= s, + * treat it like unsupported (so caller falls back to pwri= te) + */ + return -ENOTSUP; + } return ret; } else { s->has_discard =3D false; --=20 2.27.0