diff options
Diffstat (limited to 'kernel/cgroup_freezer.c')
| -rw-r--r-- | kernel/cgroup_freezer.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index 345628c78b5..a79e40f9d70 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -59,7 +59,7 @@ static inline struct freezer *task_freezer(struct task_struct *task) static struct freezer *parent_freezer(struct freezer *freezer) { - return css_freezer(css_parent(&freezer->css)); + return css_freezer(freezer->css.parent); } bool cgroup_freezing(struct task_struct *task) @@ -73,10 +73,6 @@ bool cgroup_freezing(struct task_struct *task) return ret; } -/* - * cgroups_write_string() limits the size of freezer state strings to - * CGROUP_LOCAL_BUFFER_SIZE - */ static const char *freezer_state_strs(unsigned int state) { if (state & CGROUP_FROZEN) @@ -304,7 +300,7 @@ static int freezer_read(struct seq_file *m, void *v) /* update states bottom-up */ css_for_each_descendant_post(pos, css) { - if (!css_tryget(pos)) + if (!css_tryget_online(pos)) continue; rcu_read_unlock(); @@ -404,7 +400,7 @@ static void freezer_change_state(struct freezer *freezer, bool freeze) struct freezer *pos_f = css_freezer(pos); struct freezer *parent = parent_freezer(pos_f); - if (!css_tryget(pos)) + if (!css_tryget_online(pos)) continue; rcu_read_unlock(); @@ -423,20 +419,22 @@ static void freezer_change_state(struct freezer *freezer, bool freeze) mutex_unlock(&freezer_mutex); } -static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft, - char *buffer) +static ssize_t freezer_write(struct kernfs_open_file *of, + char *buf, size_t nbytes, loff_t off) { bool freeze; - if (strcmp(buffer, freezer_state_strs(0)) == 0) + buf = strstrip(buf); + + if (strcmp(buf, freezer_state_strs(0)) == 0) freeze = false; - else if (strcmp(buffer, freezer_state_strs(CGROUP_FROZEN)) == 0) + else if (strcmp(buf, freezer_state_strs(CGROUP_FROZEN)) == 0) freeze = true; else return -EINVAL; - freezer_change_state(css_freezer(css), freeze); - return 0; + freezer_change_state(css_freezer(of_css(of)), freeze); + return nbytes; } static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css, @@ -460,7 +458,7 @@ static struct cftype files[] = { .name = "state", .flags = CFTYPE_NOT_ON_ROOT, .seq_show = freezer_read, - .write_string = freezer_write, + .write = freezer_write, }, { .name = "self_freezing", |