linux-kernel - Re: [RFC PATCH 4/4] docs: tmpfs: Add casefold options

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Date:   Tue, 23 Mar 2021 14:58:20 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     André Almeida <andrealmeid@...labora.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
Cc:     krisman@...labora.com, smcv@...labora.com, kernel@...labora.com,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Rosenberg <drosen@...gle.com>
Subject: Re: [RFC PATCH 4/4] docs: tmpfs: Add casefold options

Hi--

On 3/23/21 12:59 PM, André Almeida wrote:
> Document mounting options to enable casefold support in tmpfs.
> 
> Signed-off-by: André Almeida <andrealmeid@...labora.com>
> ---
>  Documentation/filesystems/tmpfs.rst | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/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=10G,nr_inodes=10k,mode=700 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.
>  
> +tmpfs has the following mounting options for case-insesitive lookups support:
> +
> +=========   ==============================================================
> +casefold    Enable casefold support at this mount point using the given
> +            argument as enconding. Currently only utf8 encondings are supported.

                           encoding.                      encodings

> +cf_strict   Enable strict casefolding at this mouting point (disabled by

                                                 mount

> +            default). This means that invalid strings should be reject by the

                                                                   rejected

> +            file system.
> +=========   ==============================================================
> +
> +Note that this option doesn't enable casefold by default, one needs to set

                                                    default; one needs to set the

> +casefold flag per directory, setting the +F attribute in an empty directory. New
> +directories within a casefolded one will inherit the flag.


-- 
~Randy