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Date: Sun, 6 Jul 2003 10:24:10 -0700
From: "Randy.Dunlap" <rddunlap@osdl.org>
To: Sancho Dauskardt <sda@bdit.de>,
       OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: linux-kernel@vger.kernel.org
Subject: Re: FAT statfs loop abort on read-error
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On Fri, 04 Jul 2003 13:57:19 +0200 Sancho Dauskardt <sda@bdit.de> wrote:

| Hi all,
| 
|   i've written to the current FAT maintainer (Gordon Chaffee) about this, 
| but he's no longer active, so:
| 
| While working in the usb-sotrage area (mostly with removeable media, eg. 
| CompactFlash in USB-Readers), i've come across a litte odd behaviour:
| 
|   when calling statfs on a volume that has been removed (without umount) 
| fat_statfs() will attempt to read all sectors of the fat table quite a few 
| times (depending on the fat type, eg. FAT16 --> 256 times).
| 
| eg:
| 1. mount /dev/sda1 /mnt/cf
| 2. remove card
| 3. df
| 
| on my system, for a 16 MB CompactFlash formated with FAT-16 this takes 47 
| seconds.
| 
| Possible solution:
| 1. let default_fat_access return something like -2 on 'can't read' error.
| 2. Abort stafs loop on error.
| 3. return -EIO
| 
| This would break mode fat_access calls. I could make a patch, but I don't 
| know what's going on with those cvf extensions (which seem to replace 
| fat_access). Is dmsdos dead / can we ignore it ?
| Somewhere in the list archives, I found comments about the cvf stuff being 
| completely removed ?

Try asking OGAWA Hirofumi (cc-ed).  He's the de facto FAT maintainter.
(I asked him to add a patch to MAINTAINTERS...)

--
~Randy
| http://developer.osdl.org/rddunlap/ | http://www.xenotime.net/linux/ |