linux-kernel - Re: [PATCH v2] fat: editions to support fat

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Message-ID: <CAKYAXd9CmZ+4j4eF0LmWLpE_ma_kKqEjEzAUOhpcCDY4UR_UBw@mail.gmail.com>
Date:	Tue, 23 Oct 2012 16:24:12 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Ravishankar N <cyberax82@...il.com>,
	Amit Sahrawat <amit.sahrawat83@...il.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2] fat: editions to support fat_fallocate()

2012/10/23, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Namjae Jeon <linkinjeon@...il.com> writes:
>
>>> Does this break the linux fat driver doesn't know about this
>>> fallocate()?  If so, it sounds like to be easy to break existent
>>> drivers.
>> Yes, it will break linux drivers without fallocate support. When we
>> try to write to fallocated file using old drivers, it will cause write
>> error and make FS read-only.
>> When fallocate was implemented in other filesystem, maybe,, was there
>> similar issue and concern  ?
>
> I guess it is not similar. Because other FS can change the spec (e.g. it
> can be possible to use feature compat flag for it).
Hi. OGAWA.
Okay, I agree.
Thanks for your interest.

> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
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