Re: 2.6.0-test9 VFAT problem

From: Gene Heskett (gene.heskett_at_verizon.net)
Date: 11/14/03

  • Next message: Frederic Rossi: "Re: So, Poll is not scalable... what to do?" 
    To: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Date:	Fri, 14 Nov 2003 13:51:18 -0500

    On Friday 14 November 2003 12:45, OGAWA Hirofumi wrote:
    >Gene Heskett <gene.heskett@verizon.net> writes:
    >> On Friday 14 November 2003 08:46, Patrick Beard wrote:
    >> >>> FAT: Bogus number of reserved sectors
    >> >>> VFS: Can't find a valid FAT filesystem on dev sda
    >>
    >> Nov 14 09:20:34 coyote kernel: FAT: Filesystem panic (dev sda1)
    >> Nov 14 09:20:34 coyote kernel: fat_free: deleting beyond EOF
    >> (i_pos 0) Nov 14 09:20:34 coyote kernel: File system has been
    >> set read-only
    >
    >Is this reproduced easy? Looks like reading the zeroed block.
    >In order to know details, could you try to read the data without
    > mount?
    >
    >For example, what happen by the following repetitions?
    >
    > dd if=/dev/sda | md5sum
    > unload driver(reset device) or unplug device

    dd if=/dev/sda1|md5sum <--note use of the same device as to read pix.
    has been running for 3 or so minutes now, steadily reading the camera.
    I shoulda put a time in front of it! Ok got it, heres the sum:
    127945+0 records in
    127945+0 records out
    f6c568dd1f35bb37f3d667a2ab228e2f

    its a 64 meg card. I'll have to unplug the camera (and cycle its
    power too) as all this is compiled into the kernel.
    Ok, repeat run, with time this time:
    Mmm, didn't get the md5sum, just the time, which was
    real 2m39.807s
    user 0m1.052s
    sys 0m1.984s
    So I'll do another run, without the reset and without the time:
    [root@coyote root]# dd if=/dev/sda1 | md5sum
    127945+0 records in
    127945+0 records out
    f6c568dd1f35bb37f3d667a2ab228e2f

    so the sums are the same, one more repeat, this time from powerdown
    reset and unplugged.
    Purrfect repeat of the above. Now lets see if /dev/sda will read
    it... Yes it does. Am I to understand that the non-numbered version
    of the device is the raw read from LSN0 of the device?
    Ahh, that of course gets a different sum, and number of records read:
    This is without the reset:
    [root@coyote root]# dd if=/dev/sda | md5sum
    128000+0 records in
    128000+0 records out
    b074ba314ac23f234b6d27da78e1e093

    reset and restart, replug etc and again:
    [root@coyote root]# dd if=/dev/sda | md5sum
    128000+0 records in
    128000+0 records out
    b074ba314ac23f234b6d27da78e1e093

    Looks like another flawless repeat here, and I'm probably making a
    serious dent in the batteries by now, that thing is positively
    ravenous when it comes to eating batteries.

    What does this tell us? 

    -- 
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz  512M
99.22% setiathome rank, not too shabby for a WV hillbilly
Yahoo.com attornies please note, additions to this message
by Gene Heskett are:
Copyright 2003 by Maurice Eugene Heskett, all rights reserved.
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