ramdisk size bug in 2.4.17-pre2

From: Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
Date: Fri Dec 07 2001 - 10:07:02 EST

Hi,

It looks like the ramdisk driver in 2.4.17-pre2 doesn't honor the
rd_size parameter:

  root@arthur:/tmp #uname -a
  Linux arthur 2.4.17-pre2 #1 Sat Dec 1 00:47:24 CET 2001 i686 unknown
  root@arthur:/tmp #cat /proc/sys/kernel/tainted
  0
  root@arthur:/tmp #modinfo rd
  filename: /lib/modules/2.4.17-pre2/kernel/drivers/block/rd.o
  description: <none>
  author: <none>
  license: "GPL"
  parm: rd_size int, description "Size of each RAM disk in kbytes."
  parm: rd_blocksize int, description "Blocksize of each RAM disk in bytes."
  root@arthur:/tmp #modprobe rd rd_size=8192
  RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize

So I would expect that each ramdisk is 8192kB. But:

  root@arthur:/tmp #dd if=/dev/zero of=/dev/ram1 bs=1k count=16384
  16384+0 records in
  16384+0 records out

IOW: writing 16MB to a 8MB ramdisk happily succeeds.

The last time I tried this was with 2.4.10-ac10, which didn't have this
bug.

Erik
[who will investigate further but is currently -ENOTIME] 

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Faculty
of Information Technology and Systems, Delft University of Technology,
PO BOX 5031, 2600 GA Delft, The Netherlands  Phone: +31-15-2783635
Fax: +31-15-2781843  Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/
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