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cgroup: reorganize cgroup.procs / task write path

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Currently, writes "cgroup.procs" and "cgroup.tasks" files are all
handled by __cgroup_procs_write() on both v1 and v2.  This patch
reoragnizes the write path so that there are common helper functions
that different write paths use.

While this somewhat increases LOC, the different paths are no longer
intertwined and each path has more flexibility to implement different
behaviors which will be necessary for the planned v2 thread support.

v3: - Restructured so that cgroup_procs_write_permission() takes
      @src_cgrp and @dst_cgrp.

v2: - Rolled in Waiman's task reference count fix.
    - Updated on top of nsdelegate changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
This commit is contained in:
Tejun Heo
2017-05-15 09:34:00 -04:00
parent 27f26753f8
commit 715c809d9a
3 changed files with 153 additions and 107 deletions
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8
kernel/cgroup/cgroup-internal.h
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@@ -180,10 +180,10 @@ int cgroup_migrate(struct task_struct *leader, bool threadgroup,
int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader,
bool threadgroup);
ssize_t __cgroup_procs_write(struct kernfs_open_file *of, char *buf,
size_t nbytes, loff_t off, bool threadgroup);
ssize_t cgroup_procs_write(struct kernfs_open_file *of, char *buf, size_t nbytes,
loff_t off);
struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup)
__acquires(&cgroup_threadgroup_rwsem);
void cgroup_procs_write_finish(struct task_struct *task)
__releases(&cgroup_threadgroup_rwsem);
void cgroup_lock_and_drain_offline(struct cgroup *cgrp);