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cgroup add cftype->open/release() callbacks

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Pipe the newly added kernfs->open/release() callbacks through cftype.
While at it, as cleanup operations now can be performed from
->release() instead of ->seq_stop(), make the latter optional.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Acked-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2016-12-27 14:49:03 -05:00
parent 0e67db2f9f
commit e90cbebc3f
2 changed files with 26 additions and 1 deletions
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3
include/linux/cgroup-defs.h
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@ -388,6 +388,9 @@ struct cftype {
struct list_head node; /* anchored at ss->cfts */
struct kernfs_ops *kf_ops;
int (*open)(struct kernfs_open_file *of);
void (*release)(struct kernfs_open_file *of);
/*
* read_u64() is a shortcut for the common case of returning a
* single integer. Use it in place of read()