Re: vfat broken in 2.6.10?

[Triffid Hunter <triffid_hunter@funkmunch.net>]

i've seen the same problems with a fat32 partition image after an unclean shutdown. reading certain files would cause the filesystem to spontaneously become read-only with error messages similar to the ones you list below.

my solution was to copy all the files off, rename the offending directory, and copy the relevant files back. unfortunately i can't remove the "dead" folder, as attempting to remove it sets the filesystem read-only :(

John Richard Moser wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I'm using Ubuntu Linux Hoary
>
> root@icebox:~# uname -a
> Linux icebox 2.6.10-5-686 #1 Tue Mar 15 15:16:01 UTC 2005 i686 GNU/Linux
>
>
> root@icebox:~# fsck.vfat -r /dev/sda1
> dosfsck 2.10, 22 Sep 2003, FAT32, LFN
> /\uffffSCK0000.REN
>   Duplicate directory entry.
>   First    Size 0 bytes, date 19:03:36 Mar 04 1980
>   Second   Size 0 bytes, date 19:00:00 Dec 31 1979
> 1) Drop first
> 2) Drop second
> 3) Rename first
> 4) Rename second
> 5) Auto-rename first
> 6) Auto-rename second
> ? 5
>   Renamed to FSCK0000.REN
> Perform changes ? (y/n) y
> /dev/sda1: 187 files, 167150/246288 clusters
> root@icebox:~# fsck.vfat -r /dev/sda1
> dosfsck 2.10, 22 Sep 2003, FAT32, LFN
> /dev/sda1: 187 files, 167150/246288 clusters
>
> Now the FS is clean.
>
> root@icebox:~# mount /dev/sda1  /media/usbdisk/
> root@icebox:~# vim /media/usbdisk/a.txt
> root@icebox:~# rm /media/usbdisk/a.txt
>
> Created, deleted a.txt
>
> root@icebox:~# umount /media/usbdisk/
> root@icebox:~# fsck.vfat -r /dev/sda1
> dosfsck 2.10, 22 Sep 2003, FAT32, LFN
> /\uffff.\000a\000.\000t.\000x\000
>   Bad file name.
> 1) Drop file
> 2) Rename file
> 3) Auto-rename
> 4) Keep it
>
> Does that say a.txt?
>
> ? 1
> /\uffffa\000.\000t\000x.\000t\000
>   Bad file name.
> 1) Drop file
> 2) Rename file
> 3) Auto-rename
> 4) Keep it
> ? 1
> /\uffff.\000a\000.\000t.\000x\000
>   Start cluster beyond limit (7798784 > 246289). Truncating file.
> /\uffff.\000a\000.\000t.\000x\000
>   File size is 4294967295 bytes, cluster chain length is 0 bytes.
>   Truncating file to 0 bytes.
> /\uffffa\000.\000t\000x.\000t\000
>   Start cluster beyond limit (4294901760 > 246289). Truncating file.
> /\uffffa\000.\000t\000x.\000t\000
>   File size is 4294967295 bytes, cluster chain length is 0 bytes.
>   Truncating file to 0 bytes.
> /\uffff.TXT
>   Contains a free cluster (167160). Assuming EOF.
> /\uffff.TXT
>   File size is 5 bytes, cluster chain length is 0 bytes.
>   Truncating file to 0 bytes.
> Perform changes ? (y/n) y
>
>
> I didn't pull the disk out at all, or anything.  Just umounted and
> remounted and made/removed a file.  Also. . .
>
>
> /dev/sda1: 189 files, 167150/246288 clusters
> root@icebox:~# fsck.vfat -r /dev/sda1
> dosfsck 2.10, 22 Sep 2003, FAT32, LFN
> /\uffff.\000a\000.\000t.\000x\000
>   Bad file name.
> 1) Drop file
> 2) Rename file
> 3) Auto-rename
> 4) Keep it
> ? 3
>   Renamed to FSCK0001.REN
> /\uffffa\000.\000t\000x.\000t\000
>   Bad file name.
> 1) Drop file
> 2) Rename file
> 3) Auto-rename
> 4) Keep it
> ? 3
>   Renamed to FSCK0002.REN
> Perform changes ? (y/n) y
> /dev/sda1: 191 files, 167150/246288 clusters
> root@icebox:~# fsck.vfat -r /dev/sda1
> dosfsck 2.10, 22 Sep 2003, FAT32, LFN
> /dev/sda1: 191 files, 167150/246288 clusters
>
> It appears dosfsck may not be working quite right.  I've taken this into
> account, hence the second pass after each fsck.  This is either a
> dosfsck issue, a usb-storage issue for the PNY compact flash drive, or
> an issue with vfat itself.
>
> So either LKML needs to fix the drivers, or Ubuntu needs to upgrade/fix
> dosfsck or some patch they've applied to the kernel.
>
> - --
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>                                                  -- Eric Steven Raymond
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