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Date:	Wed, 11 Nov 2009 12:33:40 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Mount -o sync regression in 2.6.31

One of the configurations supported in our specialized distribution is using
floppy to store configuration information (and live cd for everything else).
The floppy is mounted with '-o sync' so that if floppy is removed the files
are still updated. The floppy is formatted with ext2 filesystem.

This broke somewhere between 2.6.30 and 2.6.31-rc1, and was caught by our
release regression system (with VMware pseudo-floppys) but it is easily
reproducible with real hardware.

The following sequence demonstrates this:

# mount /dev/fd0 /mnt -o sync,noatime,noexec,nosuid 
# cp /etc/motd /mnt/motd.$$

(Manually eject floppy)

# umount /mnt

(I/O errors occur)

With -o sync, all I/O should have been completed when the copy was done.

This may also effect people using -o sync on USB thumb drives as well.

I tried the obvious bisection, but git bisect seems to wonder off into the
weeds now. There is no reason that bisecting between v2.6.30 and v2.6.31-rc1
should go off into v2.6.30-rc2

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