Quoting David Shwatrz (dshwa...@gmail.com): > Hello, > > When I perform the next sequence it finishes ok: > mkdir /cgroup/freezer > mount -t cgroup -o freezer testf /cgroup/freezer/ > umount /cgroup/freezer > > I had also added printk in the cgroup unmount handler , > cgroup_kill_sb(), immediately in the > beginning of the method, and we reach it (kernel/cgroup.c) > > Now I try the following sequence: > mkdir /cgroup/freezer > mount -t cgroup -o freezer testf /cgroup/freezer/ > mkdir /cgroup/freezer/0 > umount /cgroup/freezer > > We do **not** reach the cgroup_kill_sb()! But there is no error > message; moreover, mount | grep freezer returns nothing. > ls -al /cgroup/freezer/ also returns noting > > > Now, at this point in running the sequences above, running > mount -t cgroup -o freezer testf /cgroup/freezer > and ls /cgroup/freezer > shows folder "0". > > Now: > running rmdir /cgroup/freezer/0 > and > umount /cgroup/freezer > *does* reach the cgroup unmount handler , cgroup_kill_sb(),. > > Should we permit unmount if groups still exist under some cgroup topmost root > ?
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