linux-kernel - Re: [PATCH] Added CONFIG_VFAT_FS

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Message-ID: <19019.27736.647500.497114@samba.org>
Date:	Thu, 2 Jul 2009 00:02:00 +1000
From:	tridge@...ba.org
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Pavel Machek <pavel@....cz>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	john.lanza@...ux.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	Steve French <sfrench@...ibm.com>,
	Mingming Cao <cmm@...ibm.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option

Hi Alan,

 > What about all the other damage vendors do to the tree and the junk they
 > stuff in their kernels - we don't accept that upstream either ?

sure, but there is no need to encourage bad behaviour by building it
into the upstream :-)

 > Its manual unless the device is visibly corrupted but it should still
 > work.

ok, with the patch I've posted applied, can you reproduce this?
Perhaps by deliberately corrupting the device in some other way (using
dd?) then running a chkdsk?

If you try to reproduce it then make sure you completely fill the VFAT
directory. If you have (for example) only 1000 files in a directory
then you'd have to redo the deliberate corruption test with new files
about 2000 times before you get a single error and rename from
chkdsk. If you only have 100 files then you'll have to do it nearly a
million times per rename.

 > The point I was making is that the world of "Windows PC & Linux
 > handheld device" is an important one.

yes, it's an extremely important use for Linux. That is why I've spent
the last 4 months working on ensuring that it continues to be viable,
by trying to create the most legally robust, most compatible patch I
can that allows these devices to continue to exist without running
significant legal risks.

If there is another approach that achieves this goal in a better way
then we should look at it. Can you suggest an alternative that will
work better for Linux handheld device makers?

Cheers, Tridge
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