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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 4188AC48BDF for ; Tue, 15 Jun 2021 15:53:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2BD8C6142E for ; Tue, 15 Jun 2021 15:53:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232524AbhFOPzD (ORCPT ); Tue, 15 Jun 2021 11:55:03 -0400 Received: from foss.arm.com ([217.140.110.172]:39002 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232169AbhFOPwI (ORCPT ); Tue, 15 Jun 2021 11:52:08 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B60E913A1; Tue, 15 Jun 2021 08:50:03 -0700 (PDT) Received: from entos-ampere-02.shanghai.arm.com (entos-ampere-02.shanghai.arm.com [10.169.214.103]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 102773F694; Tue, 15 Jun 2021 08:49:58 -0700 (PDT) From: Jia He To: Petr Mladek , Steven Rostedt , Sergey Senozhatsky , Andy Shevchenko , Rasmus Villemoes , Jonathan Corbet , Alexander Viro , Linus Torvalds Cc: "Peter Zijlstra (Intel)" , Eric Biggers , "Ahmed S. Darwish" , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Matthew Wilcox , Jia He Subject: [PATCH RFCv4 0/4] make '%pD' print full path for file Date: Tue, 15 Jun 2021 23:49:48 +0800 Message-Id: <20210615154952.2744-1-justin.he@arm.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Background ========== Linus suggested printing full path for file instead of printing the components as '%pd'. Typically, there is no need for printk specifiers to take any real locks (ie mount_lock or rename_lock). So I introduce a new helper d_path_fast which is similar to d_path except it doesn't take any seqlock/spinlock. This series is based on Al Viro's d_path cleanup patches [1] which lifted the inner lockless loop into a new helper. [1] https://lkml.org/lkml/2021/5/18/1260 Test ==== The cases I tested: 1. print '%pD' with full path of ext4 file 2. mount a ext4 filesystem upon a ext4 filesystem, and print the file with '%pD' 3. all test_print selftests, including the new '%14pD' '%-14pD' 4. kasnprintf Changelog ========= v4: - don't support spec.precision anymore for '%pD' - add Rasmus's patch into this series v3: - implement new d_path_unsafe to use [buf, end] instead of stack space for filling bytes (by Matthew) - add new test cases for '%pD' - drop patch "hmcdrv: remove the redundant directory path" before removing rfc. v2: - implement new d_path_fast based on Al Viro's patches - add check_pointer check (by Petr) - change the max full path size to 256 in stack space v1: https://lkml.org/lkml/2021/5/8/122 Jia He (4): fs: introduce helper d_path_unsafe() lib/vsprintf.c: make '%pD' print full path for file lib/test_printf.c: split write-beyond-buffer check in two lib/test_printf.c: add test cases for '%pD' Documentation/core-api/printk-formats.rst | 5 +- fs/d_path.c | 83 ++++++++++++++++++++++- include/linux/dcache.h | 1 + lib/test_printf.c | 31 ++++++++- lib/vsprintf.c | 37 ++++++++-- 5 files changed, 148 insertions(+), 9 deletions(-) -- 2.17.1