linux-kernel - Re: [PATCH] Add CONFIG_VFAT_NO_CREATE_WITH

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Message-Id: <1241204973.13073.55.camel@norville.austin.ibm.com>
Date:	Fri, 01 May 2009 14:09:33 -0500
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Ogawa Hirofumi <hirofumi@...l.parknet.co.jp>,
	Andrew Tridgell <tridge@...ba.org>,
	Steve French <sfrench@...ibm.com>,
	Mingming Cao <cmm@...ibm.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] Add CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES option

On Fri, 2009-05-01 at 22:19 +0400, Michael Tokarev wrote:
> Dave Kleikamp wrote:
> > On Fri, 2009-05-01 at 13:47 -0400, Christoph Hellwig wrote:
> >> On Fri, May 01, 2009 at 12:41:29PM -0500, Dave Kleikamp wrote:
> >>> From: Andrew Tridgell <tridge@...ba.org>
> >>> Subject: [PATCH] Add CONFIG_VFAT_NO_CREATE_WITH_LONGNAMES option
> >>>
> >>> When this option is enabled the VFAT filesystem will refuse to create
> >>> new files with long names. Accessing existing files with long names
> >>> will continue to work.
> >>>
> >>> File names to be created must conform to the 8.3 format.  Mixed case is
> >>> not allowed in either the prefix or the suffix.
> >> This doesn't make any sense as a compile time option. Might make sense
> >> as a mount option, but I'd like to hear a rationale for it first.
> > 
> > Some linux-based devices would be happy not to contain code to create
> > the long name at all.
> 
> Well, is that a rationale per se?  Which devices they are and why?

Could be anything.  cameras, phones, etc.  Anything that might be
mountable by a host computer in order to share files, or to write to a
device that can be shared by other computers or devices.

> But besides, why `msdos' filesystem is not sufficient?
> It contains no code to create long file names and no code to
> read such names either.

An example, an mp3 player wants to read files with long mixed-case
names, which can be manipulated on a host computer.  But it may not need
to create files that don't fit the 8.3 syntax.

Of course, msdos might be a good option for other devices.

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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