linux-kernel - Re: [PATCH] Make JFFS2 endianness configurable

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Message-ID: <CAFLxGvy-0-A1Ta1vf=o4q0tcJAdr+uv9eQc7UrnwqF9NkJiWUw@mail.gmail.com>
Date:   Fri, 2 Nov 2018 21:15:06 +0100
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     danielwa@...co.com
Cc:     Al Viro <viro@...iv.linux.org.uk>, nkela@...co.com,
        xe-linux-external@...co.com, LKML <linux-kernel@...r.kernel.org>,
        "linux-mtd @ lists . infradead . org" <linux-mtd@...ts.infradead.org>,
        Rod Whitby <rod@...tby.id.au>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] Make JFFS2 endianness configurable

On Fri, Nov 2, 2018 at 3:04 PM Daniel Walker <danielwa@...co.com> wrote:
> Do you have any thought on how to implement it ? I was think abstracting the
> endian functions in the nodelist.h

Yes, see what UFS does.

> static inline jint16_t cpu_to_je16(jint16_t x) {
>         if (check_big_endian()) {
>                 return cpu_to_be16(x);
>         } else if (check_little_endian()) {
>                 return cpu_to_le16(x);
>         }
> }
>
> but how would you setup the checking ?

Make it a mount option and store the endianness mode in the super block.

-- 
Thanks,
//richard