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[2620:137:e000::1:20]) by mx.google.com with ESMTP id e19-20020a170902e0d300b00153b2d1649fsi13157480pla.167.2022.03.22.16.29.04; Tue, 22 Mar 2022 16:29:25 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=FYZPx3PS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229996AbiCVTb7 (ORCPT + 99 others); Tue, 22 Mar 2022 15:31:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229925AbiCVTb6 (ORCPT ); Tue, 22 Mar 2022 15:31:58 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0BAE579388 for ; Tue, 22 Mar 2022 12:30:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647977428; 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: in-reply-to:in-reply-to:references:references; bh=V5V/hUtU1eWPYAfu3Vkm3R/UNQxwyoHX973gqDqsE8I=; b=FYZPx3PShsAaApuk8DFuWpRZWgrzgFm4+sMmnEAt29joSEgg76ZPa81d3Z7pFllZuv+D0u bX4owp6zDPvAN91pDXIN16OB1+NM0uCPJpByWWdPc+VOLWYAJ6a8YCkWsaEfx6I0PdU7EE QGeqNEaVbPn1IkSiApBB4arCK+3jO7k= Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-457-yC_o1YQuPee2IKSjRCLbVg-1; Tue, 22 Mar 2022 15:30:26 -0400 X-MC-Unique: yC_o1YQuPee2IKSjRCLbVg-1 Received: by mail-qk1-f197.google.com with SMTP id y140-20020a376492000000b0067b14129a63so12469121qkb.9 for ; Tue, 22 Mar 2022 12:30:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=V5V/hUtU1eWPYAfu3Vkm3R/UNQxwyoHX973gqDqsE8I=; b=n+IUPtxNE18QRHlVGIvWugYRdBxQBUczhLY87mlA4m6w3/Cd0KdBU7JNhVjy5oEQZ3 ke1y3RuWoU+gbNR9m75JfLzMzvTzOiCaM93tULXBKh7hgd3gHbZRAe3fmhZG+FJCXlmx ib5BNH/vKaDMwtHVPdg+guoXS/SrcW5Q/rDZYiJPeN/hwE9mV+fBCQSDkXoQd0Wsz/g9 0dD/8ermuTd8uxmlN64w7JsDRkrg8CDj4eA0M3TouefEijdMXl7vMD8zN3qx3LPPbANc BmKAPfLHTkVVUfuTbBjdlOryW1gha5N1FLKxwDRrAd5mHOtN79YJ91Rv4Ddk5mkQSYh9 MOYg== X-Gm-Message-State: AOAM5335b6t9QnogWYLXKEvaDXop2fmujav+KbMX26r2VnE81ieGjT8k hpVZ+OIhw99Wd31A3CF4wITedpdcIu6E9LohD3g/EYelELxNEzmNCeBnX/HgOvxGOftQ0lIEF/5 WVQeoaNVv4LhIaNxyxbHrtRjuEI7gOH1VRjZexB4n X-Received: by 2002:a05:620a:c46:b0:67e:1559:559a with SMTP id u6-20020a05620a0c4600b0067e1559559amr16097360qki.437.1647977426249; Tue, 22 Mar 2022 12:30:26 -0700 (PDT) X-Received: by 2002:a05:620a:c46:b0:67e:1559:559a with SMTP id u6-20020a05620a0c4600b0067e1559559amr16097353qki.437.1647977426061; Tue, 22 Mar 2022 12:30:26 -0700 (PDT) MIME-Version: 1.0 References: <20220322192712.709170-1-mszeredi@redhat.com> In-Reply-To: <20220322192712.709170-1-mszeredi@redhat.com> From: Miklos Szeredi Date: Tue, 22 Mar 2022 20:30:15 +0100 Message-ID: Subject: Re: [RFC PATCH] getvalues(2) prototype To: linux-fsdevel Cc: lkml , Linux API , linux-man , linux-security-module@vger.kernel.org, Karel Zak , Ian Kent , David Howells , Linus Torvalds , Al Viro , Christian Brauner , Amir Goldstein , James Bottomley Content-Type: multipart/mixed; boundary="000000000000148ba905dad3a5c2" X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000148ba905dad3a5c2 Content-Type: text/plain; charset="UTF-8" On Tue, Mar 22, 2022 at 8:27 PM Miklos Szeredi wrote: > > Add a new userspace API that allows getting multiple short values in a > single syscall. Attaching a test program that allows arbitrary queries. Thanks, Miklos --000000000000148ba905dad3a5c2 Content-Type: text/x-csrc; charset="US-ASCII"; name="getvalues.c" Content-Disposition: attachment; filename="getvalues.c" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_l12j71mq0 I2luY2x1ZGUgPHVuaXN0ZC5oPgojaW5jbHVkZSA8c3RyaW5nLmg+CiNpbmNsdWRlIDxzdGRpby5o PgojaW5jbHVkZSA8ZmNudGwuaD4KI2luY2x1ZGUgPGVyci5oPgojaW5jbHVkZSA8c3RkaW50Lmg+ CiNpbmNsdWRlIDxzeXMvdWlvLmg+CgpzdHJ1Y3QgbmFtZV92YWwgewoJY29uc3QgY2hhciAqbmFt ZTsJLyogaW4gKi8KCXN0cnVjdCBpb3ZlYyB2YWx1ZV9pbjsJLyogaW4gKi8KCXN0cnVjdCBpb3Zl YyB2YWx1ZV9vdXQ7CS8qIG91dCAqLwoJdWludDMyX3QgZXJyb3I7CQkvKiBvdXQgKi8KCXVpbnQz Ml90IHJlc2VydmVkOwp9OwoKCmludCBnZXR2YWx1ZXMoaW50IGRmZCwgY29uc3QgY2hhciAqcGF0 aCwgc3RydWN0IG5hbWVfdmFsICp2ZWMsIHNpemVfdCBudW0sCgkgICAgICB1bnNpZ25lZCBpbnQg ZmxhZ3MpCnsKCXJldHVybiBzeXNjYWxsKDQ1MSwgZGZkLCBwYXRoLCB2ZWMsIG51bSwgZmxhZ3Mp Owp9CgppbnQgbWFpbihpbnQgYXJnYywgY2hhciAqYXJndltdKQp7CgljaGFyICpzLCBidWZbNDA5 Nl07CglpbnQgcmVzLCBpLCBvLCBudW0gPSBhcmdjIC0gMjsKCXN0cnVjdCBuYW1lX3ZhbCBudnNb MjU2XSA9IHt9OwoKCWlmIChhcmdjIDwgMykKCQllcnJ4KDEsICJ1c2FnZTogJXMgcGF0aCBuYW1l IFsuLi5dIiwgYXJndlswXSk7CglpZiAobnVtID4gMjU2KQoJCWVycngoMSwgInRvbyBtYW55IGFy Z3VtZW50cyIpOwoKCWZvciAoaSA9IDA7IGkgPCBudW07IGkrKykKCQludnNbaV0ubmFtZSA9IGFy Z3ZbaSArIDJdOwoKCW52c1swXS52YWx1ZV9pbi5pb3ZfYmFzZSA9IGJ1ZjsKCW52c1swXS52YWx1 ZV9pbi5pb3ZfbGVuID0gc2l6ZW9mKGJ1Zik7CgoJcmVzID0gZ2V0dmFsdWVzKEFUX0ZEQ1dELCBh cmd2WzFdLCBudnMsIG51bSwgMCk7CglpZiAocmVzID09IC0xKQoJCWVycigxLCBOVUxMKTsKCglu dW0gPSByZXM7Cglmb3IgKGkgPSAwOyBpIDwgbnVtOyBpKyspIHsKCQlwcmludGYoIlslc10gPSAi LCBudnNbaV0ubmFtZSk7CgkJcmVzID0gbnZzW2ldLmVycm9yOwoJCWlmIChyZXMpIHsKCQkJcHJp bnRmKCIgRVJST1I6ICVzICglaSlcbiIsIHN0cmVycm9yKHJlcyksIHJlcyk7CgkJfSBlbHNlIHsK CQkJcmVzID0gbnZzW2ldLnZhbHVlX291dC5pb3ZfbGVuOwoJCQlzID0gbnZzW2ldLnZhbHVlX291 dC5pb3ZfYmFzZTsKCgkJCWZvciAobyA9IDA7IG8gPCByZXM7IG8gKz0gc3RybGVuKHMgKyBvKSAr IDEpCgkJCQlwcmludGYoIlwiJS4qc1wiICIsIHJlcyAtIG8sIHMgKyBvKTsKCgkJCXByaW50Zigi KGxlbj0laSlcbiIsIHJlcyk7CgkJfQoJfQoJcmV0dXJuIDA7Cn0K --000000000000148ba905dad3a5c2--