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Mon, 27 Jul 2020 12:18:57 -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-204-4lgGwcgqOnuuwhLoeVyejw-1; Mon, 27 Jul 2020 12:18:46 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 73F8E8017FB; Mon, 27 Jul 2020 16:18:45 +0000 (UTC) Received: from horse.redhat.com (ovpn-115-13.rdu2.redhat.com [10.10.115.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E6536931E; Mon, 27 Jul 2020 16:18:41 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 27A1B220264; Mon, 27 Jul 2020 12:18:41 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1595866732; 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; bh=suw3U2SRBPelvw/teEfa99Vv6v2lBc5It1zYYhdim3A=; b=Ha7AZJX5NE1W+N08swsS7TDQWSgJqOb8cT27vTEdMf8VlVTf3WZSRhUssc2/YKHl/UKhBs f1IdxS+3JNhmqXlVgjRd3a7jgaWeuT3F/G+07Qdupmv8P5wyw7t+ksZzUbnuBPX/92Knxs iFPgVeOJdEPrqNzONiQxEBYsr8qlVsA= X-MC-Unique: 4lgGwcgqOnuuwhLoeVyejw-1 Date: Mon, 27 Jul 2020 12:18:41 -0400 From: Vivek Goyal To: qemu-devel@nongnu.org Subject: [PATCH] virtiofsd: Disable remote posix locks by default Message-ID: <20200727161841.GA54539@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline 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=205.139.110.61; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/27 01:46:13 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: virtio-fs-list , Miklos Szeredi , "Dr. David Alan Gilbert" , jimbothom@yandex.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Right now we enable remote posix locks by default. That means when guest does a posix lock it sends request to server (virtiofsd). But currently we only support non-blocking posix lock and return -EOPNOTSUPP for blocking version. This means that existing applications which are doing blocking posix locks get -EOPNOTSUPP and fail. To avoid this, people have been running virtiosd with option "-o no_posix_lock". For new users it is still a surprise and trial and error takes them to this option. Given posix lock implementation is not complete in virtiofsd, disable it by default. This means that posix locks will work with-in applications in a guest but not across guests. Anyway we don't support sharing filesystem among different guests yet in virtiofs so this should not lead to any kind of surprise or regression and will make life little easier for virtiofs users. Reported-by: Aa Aa Suggested-by: Miklos Szeredi Signed-off-by: Vivek Goyal Reviewed-by: Stefan Hajnoczi --- tools/virtiofsd/passthrough_ll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index 6514674f04..82d8c962d0 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -3208,7 +3208,7 @@ int main(int argc, char *argv[]) struct lo_data lo =3D { .debug =3D 0, .writeback =3D 0, - .posix_lock =3D 1, + .posix_lock =3D 0, .proc_self_fd =3D -1, }; struct lo_map_elem *root_elem; --=20 2.25.4