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UPSTREAM: 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>

(cherry picked from commit e90cbebc3fa5caea4c8bfeb0d0157a0cee53efc7)

Bug: 111308141
Test: modified lmkd to use PSI and tested using lmkd_unit_test

Change-Id: Iff9794cbbc2c7067c24cb2f767bbdeffa26b5180
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Tejun Heo 2016-12-27 14:49:03 -05:00 • committed by Suren Baghdasaryan
parent 1325e703d6
commit 59735bfc7e
2 changed files with 26 additions and 1 deletions
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24
kernel/cgroup.c
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@ -3501,6 +3501,23 @@ static int cgroup_cpu_pressure_show(struct seq_file *seq, void *v)
}
#endif
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)
{
@ -3551,7 +3568,8 @@ 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)
@ -3573,12 +3591,16 @@ 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,