(2012/11/01 4:44), Tejun Heo wrote: > This patch makes cgroup_create() fail if @parent is marked removed. > This is to prepare for further updates to cgroup_rmdir() path. > > Note that this change isn't strictly necessary. cgroup can only be > created via mkdir and the removed marking and dentry removal happen > without releasing cgroup_mutex, so cgroup_create() can never race with > cgroup_rmdir(). Even after the scheduled updates to cgroup_rmdir(), > cgroup_mkdir() and cgroup_rmdir() are synchronized by i_mutex > rendering the added liveliness check unnecessary. > > Do it anyway such that locking is contained inside cgroup proper and > we don't get nasty surprises if we ever grow another caller of > cgroup_create(). > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > Reviewed-by: Michal Hocko <mhocko@xxxxxxx> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
