Comment 40 for bug 543617

Description of problem: umount on ext4 has seriously regressed, stalling for over a minute (or more):
https://bugzilla.kernel.org/show_bug.cgi?id=15906

Version-Release number of selected component (if applicable): 2.6.33

How reproducible: always

Steps to Reproduce:
1. install a Fedora 13, accepted defaults.
2. Run the following as root:

cd /tmp
dd if=/dev/zero of=test.ext4 bs=1 count=1 seek=1G
mkfs.ext4 -F test.ext4
mkdir -p /mnt/test
mount -o loop test.ext4 /mnt/test
echo $(seq 65536) | (cd /mnt/test; xargs touch)
time umount /mnt/test

Actual results: over a minute to perform umount.

Expected results: a few seconds.