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cgroup: replace cftype->trigger() with cftype->write()

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cftype->trigger() is pointless.  It's trivial to ignore the input
buffer from a regular ->write() operation.  Convert all ->trigger()
users to ->write() and remove ->trigger().

This patch doesn't introduce any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
This commit is contained in:
Tejun Heo 2014-05-13 12:16:21 -04:00
commit 6770c64e5c
5 changed files with 35 additions and 43 deletions
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5
kernel/cgroup.c
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@ -1034,8 +1034,7 @@ static umode_t cgroup_file_mode(const struct cftype *cft)
if (cft->read_u64 || cft->read_s64 || cft->seq_show)
mode |= S_IRUGO;
if (cft->write_u64 || cft->write_s64 || cft->write ||
cft->trigger)
if (cft->write_u64 || cft->write_s64 || cft->write)
mode |= S_IWUSR;
return mode;
@ -2750,8 +2749,6 @@ static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,
ret = kstrtoll(buf, 0, &v);
if (!ret)
ret = cft->write_s64(css, cft, v);
} else if (cft->trigger) {
ret = cft->trigger(css, (unsigned int)cft->private);
} else {
ret = -EINVAL;
}