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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 6C94AC4361B for ; Thu, 10 Dec 2020 20:02:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 229FB22E00 for ; Thu, 10 Dec 2020 20:02:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404534AbgLJUCH (ORCPT ); Thu, 10 Dec 2020 15:02:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404297AbgLJUCD (ORCPT ); Thu, 10 Dec 2020 15:02:03 -0500 Received: from mail-io1-xd43.google.com (mail-io1-xd43.google.com [IPv6:2607:f8b0:4864:20::d43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5284AC0613D6 for ; Thu, 10 Dec 2020 12:01:23 -0800 (PST) Received: by mail-io1-xd43.google.com with SMTP id q137so6874633iod.9 for ; Thu, 10 Dec 2020 12:01:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=g9wyBKhUFn5MftHH1nBQv0b+/+lQzzrxlCkxBzkiQkw=; b=ZUOsicGAsjaxaxMruwDX+r/8yws7MgUYX/uXSJml/uFlQ+KWeVbJFU3gg0C//SqWhF LyizevQmC7DezFajy/xYr02Huh54dHEWgPOUdKzMWK875Dte/YP8LPgojGceb6OSuA08 +zTnQMuvviRfqV+ca7AGBbYBIWNBPtHycXSQuyipGXnr2ldLNmXr4leGhfad3PwbOLhU TVn7Ul85OI2pzhXpHGkrdiDxozVQy75N1t9Z6RiD/J/R2w6V0Nqivp5g6e+5DXHTt1Dy d7Kb0sQ9l52qOjPDkG2W27j9VkJxvZtbo0lp1RfRvLwbL6oOHmug7SC5U4I8pRRNazAd QkIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=g9wyBKhUFn5MftHH1nBQv0b+/+lQzzrxlCkxBzkiQkw=; b=FLdZ/UQA2QYuMzc0ubAQDwHMaH29uZ4SL8mhfU/pr6CjEE81tTnGQi+k8q4HJ/u4ic Kq0Ce72UEOz99l2gvQEaoqyTSuecDVeselUmTxAwW2o0l8Cr2pq/XL03zBwuIwhsgXwN UeXUO2tayPQkrwZ0pX2Fw2E+ZjG75BmiPipC+rNlHpI5muUZqH2NqkyyAkMyaSRXmGTx qXOpGd5pdBeQ3b8fB0b1ruszTpG7JZtIlPhpMGnkSeTMf6vSidAnTWaSobldlaFe7Md4 qxAW25zsSHmZmYD6w6W/g/BMB2/2L9642MAWIucQfuZB0QtBMh/wIUOHV4FEst5Wr3g8 mTug== X-Gm-Message-State: AOAM530jr3bQstDzhimN4FPGJFJD5WfHM8V9nEWkcCrvURE9YuQClmBr 0s+opkWizmx+Yb3inVa6R1fp29QkUVEuvA== X-Google-Smtp-Source: ABdhPJyMvgOTu5LjV7jYWGp5juEAIZ+UJRF5innuk8cif+w2Av3cg3mtEle0Z3fgu7Vw1aGV0J+sFA== X-Received: by 2002:a05:6602:258b:: with SMTP id p11mr9902926ioo.115.1607630482473; Thu, 10 Dec 2020 12:01:22 -0800 (PST) Received: from p1.localdomain ([65.144.74.34]) by smtp.gmail.com with ESMTPSA id x5sm3850277ilm.22.2020.12.10.12.01.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Dec 2020 12:01:21 -0800 (PST) From: Jens Axboe To: linux-fsdevel@vger.kernel.org Cc: torvalds@linux-foundation.org, viro@zeniv.linux.org.uk, Jens Axboe Subject: [PATCH 2/2] fs: expose LOOKUP_NONBLOCK through openat2() RESOLVE_NONBLOCK Date: Thu, 10 Dec 2020 13:01:14 -0700 Message-Id: <20201210200114.525026-3-axboe@kernel.dk> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201210200114.525026-1-axboe@kernel.dk> References: <20201210200114.525026-1-axboe@kernel.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Now that we support non-blocking path resolution internally, expose it via openat2() in the struct open_how ->resolve flags. This allows applications using openat2() to limit path resolution to the extent that it is already cached. If the lookup cannot be satisfied in a non-blocking manner, openat2(2) will return -1/-EAGAIN. Cc: Al Viro Signed-off-by: Jens Axboe --- fs/open.c | 2 ++ include/linux/fcntl.h | 2 +- include/uapi/linux/openat2.h | 2 ++ 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/open.c b/fs/open.c index 9af548fb841b..07dc9f3d1628 100644 --- a/fs/open.c +++ b/fs/open.c @@ -1087,6 +1087,8 @@ inline int build_open_flags(const struct open_how *how, struct open_flags *op) lookup_flags |= LOOKUP_BENEATH; if (how->resolve & RESOLVE_IN_ROOT) lookup_flags |= LOOKUP_IN_ROOT; + if (how->resolve & RESOLVE_NONBLOCK) + lookup_flags |= LOOKUP_NONBLOCK; op->lookup_flags = lookup_flags; return 0; diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h index 921e750843e6..919a13c9317c 100644 --- a/include/linux/fcntl.h +++ b/include/linux/fcntl.h @@ -19,7 +19,7 @@ /* List of all valid flags for the how->resolve argument: */ #define VALID_RESOLVE_FLAGS \ (RESOLVE_NO_XDEV | RESOLVE_NO_MAGICLINKS | RESOLVE_NO_SYMLINKS | \ - RESOLVE_BENEATH | RESOLVE_IN_ROOT) + RESOLVE_BENEATH | RESOLVE_IN_ROOT | RESOLVE_NONBLOCK) /* List of all open_how "versions". */ #define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */ diff --git a/include/uapi/linux/openat2.h b/include/uapi/linux/openat2.h index 58b1eb711360..ddbf0796841a 100644 --- a/include/uapi/linux/openat2.h +++ b/include/uapi/linux/openat2.h @@ -35,5 +35,7 @@ struct open_how { #define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".." be scoped inside the dirfd (similar to chroot(2)). */ +#define RESOLVE_NONBLOCK 0x20 /* Only complete if resolution can be + done without IO */ #endif /* _UAPI_LINUX_OPENAT2_H */ -- 2.29.2