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Subject: Re: [RFC PATCH 4/4] docs: tmpfs: Add casefold options
To:     =?UTF-8?Q?Andr=c3=a9_Almeida?= <andrealmeid@collabora.com>,
        Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>
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 <drosen@google.com>
References: <20210323195941.69720-1-andrealmeid@collabora.com>
 <20210323195941.69720-5-andrealmeid@collabora.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <ec9ce4a7-30a9-67a1-90ce-e7709f04eb12@infradead.org>
Date:   Tue, 23 Mar 2021 14:58:20 -0700
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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@collabora.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