tree 5b33ea4cafb8df1b90d0dbb7e10503d4d5bc20b9
parent 6770c64e5c8da4705d1f0973bdeb5c2bf4f3a404
author Tejun Heo <tj@kernel.org> 1399997782 -0400
committer Tejun Heo <tj@kernel.org> 1399997782 -0400

cgroup: convert "tasks" and "cgroup.procs" handle to use cftype->write()

cgroup_tasks_write() and cgroup_procs_write() are currently using
cftype->write_u64().  This patch converts them to use cftype->write()
instead.  This allows access to the associated kernfs_open_file which
will be necessary to implement the planned kernfs active protection
manipulation for these files.

This shifts buffer parsing to attach_task_by_pid() and makes it return
@nbytes on success.  Let's rename it to __cgroup_procs_write() to
clearly indicate that this is a write handler implementation.

This patch doesn't introduce any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>