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Date: Sat, 2 Aug 2003 18:08:50 +0300
From: Ruslan Ermilov <ru@FreeBSD.org>
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cc: Marcel Moolenaar <marcel@FreeBSD.org>
cc: Poul-Henning Kamp <phk@FreeBSD.org>
Subject: MSDOSFS woes
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Gang, :-)

While working with Marcel on a bootable CD-ROM for IA64 issue,
I've stumbled upon the following problem.  I needed to increase
the size of the EFI partition (which is an MS-DOS file system)
to 64M, and that made two of my machines stuck solidly -- a lot
of process are waiting on the "wdrain" event.

The issue is not IA64 specific, both machines in question are
i386.  The following script makes my machines unhappy:

EFISZ=3D131072
dd if=3D/dev/zero of=3D$BASE/$EFIPART count=3D$EFISZ
md=3D`mdconfig -a -t vnode -f $BASE/$EFIPART`
newfs_msdos -F 12 -S 512 -h 4 -o 0 -s $EFISZ -u 16 $md
mount -t msdosfs /dev/$md /mnt
dd if=3D/dev/zero of=3D/mnt/foo

Changing to the -F 16 does not take any (good) effect.
Anyone is interested in narrowing it down?


Cheers,
--=20
Ruslan Ermilov		Sysadmin and DBA,
ru@sunbay.com		Sunbay Software Ltd,
ru@FreeBSD.org		FreeBSD committer

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