Re: 2.4: "access beyond end of device" after ext2 mount

[Mario Holbe <Mario.Holbe@TU-Ilmenau.DE>]

On Tue, Jan 18, 2005 at 08:42:08AM -0500, Piszcz, Justin Michael wrote:
> Normally, this problem associated with drives over 32GB or 127GB on a
> controller that cannot support it.  It was not discussed here, I was
> wondering if that is the problem, if it is not, what type of Hard Drive
> is giving you these problems?

This does not depend on the type of the hard disk for sure.

root@darkside:/dev/shm# dd if=/dev/zero of=foo bs=1024 count=10001
10001+0 records in
10001+0 records out
10241024 bytes transferred in 0,062195 seconds (164659895 bytes/sec)
root@darkside:/dev/shm# losetup /dev/loop0 foo
loop: loaded (max 8 devices)
root@darkside:/dev/shm# mke2fs -b 4096 /dev/loop0
...
root@darkside:/dev/shm# blockdev --getbsz /dev/loop0
1024
root@darkside:/dev/shm# dd if=/dev/loop0 of=/dev/null
20002+0 records in
20002+0 records out
10241024 bytes transferred in 0,248255 seconds (41252031 bytes/sec)
root@darkside:/dev/shm# mount -o ro /dev/loop0 /mnt
root@darkside:/dev/shm# umount /dev/loop0
root@darkside:/dev/shm# blockdev --getbsz /dev/loop0
4096
root@darkside:/dev/shm# dd if=/dev/loop0 of=/dev/null
attempt to access beyond end of device
07:00: rw=0, want=10004, limit=10001
dd: reading `/dev/loop0': Input/output error
20000+0 records in
20000+0 records out
10240000 bytes transferred in 0,185949 seconds (55068833 bytes/sec)

Of course you could reproduce it much more simple without all
the ext2 stuff using blockdev --setbsz :)


Mario
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