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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 9080EC433DB for ; Tue, 23 Mar 2021 20:00:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3953461990 for ; Tue, 23 Mar 2021 20:00:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3953461990 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id CF4CF6B0149; Tue, 23 Mar 2021 16:00:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CA5E26B014A; Tue, 23 Mar 2021 16:00:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B45516B0160; Tue, 23 Mar 2021 16:00:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0179.hostedemail.com [216.40.44.179]) by kanga.kvack.org (Postfix) with ESMTP id 94B5A6B0149 for ; Tue, 23 Mar 2021 16:00:15 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 57FBC180F68A3 for ; Tue, 23 Mar 2021 20:00:15 +0000 (UTC) X-FDA: 77952205590.27.37BB8FE Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) by imf05.hostedemail.com (Postfix) with ESMTP id 6E847E00023A for ; Tue, 23 Mar 2021 20:00:14 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: tonyk) with ESMTPSA id 145E31F44E0F From: =?UTF-8?q?Andr=C3=A9=20Almeida?= To: Hugh Dickins , Andrew Morton , Alexander Viro Cc: krisman@collabora.com, smcv@collabora.com, kernel@collabora.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Rosenberg , =?UTF-8?q?Andr=C3=A9=20Almeida?= Subject: [RFC PATCH 4/4] docs: tmpfs: Add casefold options Date: Tue, 23 Mar 2021 16:59:41 -0300 Message-Id: <20210323195941.69720-5-andrealmeid@collabora.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210323195941.69720-1-andrealmeid@collabora.com> References: <20210323195941.69720-1-andrealmeid@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Stat-Signature: wu3zt8djysuw3ruqintsuw655fuhjsdb X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 6E847E00023A Received-SPF: none (collabora.com>: No applicable sender policy available) receiver=imf05; identity=mailfrom; envelope-from=""; helo=bhuna.collabora.co.uk; client-ip=46.235.227.227 X-HE-DKIM-Result: none/none X-HE-Tag: 1616529614-772767 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Document mounting options to enable casefold support in tmpfs. Signed-off-by: Andr=C3=A9 Almeida --- Documentation/filesystems/tmpfs.rst | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesyst= ems/tmpfs.rst index 0408c245785e..84c87c309bd7 100644 --- a/Documentation/filesystems/tmpfs.rst +++ b/Documentation/filesystems/tmpfs.rst @@ -170,6 +170,32 @@ So 'mount -t tmpfs -o size=3D10G,nr_inodes=3D10k,mod= e=3D700 tmpfs /mytmpfs' will give you tmpfs instance on /mytmpfs which can allocate 10GB RAM/SWAP in 10240 inodes and it is only accessible by root. =20 +tmpfs has the following mounting options for case-insesitive lookups sup= port: + +=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +casefold Enable casefold support at this mount point using the given + argument as enconding. Currently only utf8 encondings are su= pported. +cf_strict Enable strict casefolding at this mouting point (disabled by + default). This means that invalid strings should be reject b= y the + file system. +=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Note that this option doesn't enable casefold by default, one needs to s= et +casefold flag per directory, setting the +F attribute in an empty direct= ory. New +directories within a casefolded one will inherit the flag. + +Example:: + + $ mount -t tmpfs -o casefold=3Dutf8-12.1.0,cf_strict tmpfs /mytmpfs + $ cd /mytmpfs + $ touch a; touch A + $ ls + A a + $ mkdir dir + $ chattr +F dir + $ touch dir/a; touch dir/A + $ ls dir + a =20 :Author: Christoph Rohland , 1.12.01 --=20 2.31.0