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cgroup add cftype->open/release() callbacks 

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
View File

@ -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()

24
kernel/cgroup.c
View File

@ -3503,6 +3503,23 @@ static int cgroup_events_show(struct seq_file *seq, void *v)
return 0;
}
static int cgroup_file_open(struct kernfs_open_file *of)
{
struct cftype *cft = of->kn->priv;
if (cft->open)
return cft->open(of);
return 0;
}
static void cgroup_file_release(struct kernfs_open_file *of)
{
struct cftype *cft = of->kn->priv;
if (cft->release)
cft->release(of);
}
static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,
size_t nbytes, loff_t off)
{
@ -3553,7 +3570,8 @@ static void *cgroup_seqfile_next(struct seq_file *seq, void *v, loff_t *ppos)
static void cgroup_seqfile_stop(struct seq_file *seq, void *v)
{
seq_cft(seq)->seq_stop(seq, v);
if (seq_cft(seq)->seq_stop)
seq_cft(seq)->seq_stop(seq, v);
}
static int cgroup_seqfile_show(struct seq_file *m, void *arg)
@ -3575,12 +3593,16 @@ static int cgroup_seqfile_show(struct seq_file *m, void *arg)
static struct kernfs_ops cgroup_kf_single_ops = {
.atomic_write_len = PAGE_SIZE,
.open = cgroup_file_open,
.release = cgroup_file_release,
.write = cgroup_file_write,
.seq_show = cgroup_seqfile_show,
};
static struct kernfs_ops cgroup_kf_ops = {
.atomic_write_len = PAGE_SIZE,
.open = cgroup_file_open,
.release = cgroup_file_release,
.write = cgroup_file_write,
.seq_start = cgroup_seqfile_start,
.seq_next = cgroup_seqfile_next,