From 182446d087906de40e514573a92a97b203695f71 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 8 Aug 2013 20:11:24 -0400 Subject: cgroup: pass around cgroup_subsys_state instead of cgroup in file methods cgroup is currently in the process of transitioning to using struct cgroup_subsys_state * as the primary handle instead of struct cgroup. Please see the previous commit which converts the subsystem methods for rationale. This patch converts all cftype file operations to take @css instead of @cgroup. cftypes for the cgroup core files don't have their subsytem pointer set. These will automatically use the dummy_css added by the previous patch and can be converted the same way. Most subsystem conversions are straight forwards but there are some interesting ones. * freezer: update_if_frozen() is also converted to take @css instead of @cgroup for consistency. This will make the code look simpler too once iterators are converted to use css. * memory/vmpressure: mem_cgroup_from_css() needs to be exported to vmpressure while mem_cgroup_from_cont() can be made static. Updated accordingly. * cpu: cgroup_tg() doesn't have any user left. Removed. * cpuacct: cgroup_ca() doesn't have any user left. Removed. * hugetlb: hugetlb_cgroup_form_cgroup() doesn't have any user left. Removed. * net_cls: cgrp_cls_state() doesn't have any user left. Removed. Signed-off-by: Tejun Heo Acked-by: Li Zefan Acked-by: Michal Hocko Acked-by: Vivek Goyal Acked-by: Aristeu Rozanski Acked-by: Daniel Wagner Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Johannes Weiner Cc: Balbir Singh Cc: Matt Helsley Cc: Jens Axboe Cc: Steven Rostedt --- kernel/cgroup_freezer.c | 40 +++++++++++++++++++++------------------- 1 file changed, 21 insertions(+), 19 deletions(-) (limited to 'kernel/cgroup_freezer.c') diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index f03a85719c3c..19613ba51444 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -245,7 +245,7 @@ out: /** * update_if_frozen - update whether a cgroup finished freezing - * @cgroup: cgroup of interest + * @css: css of interest * * Once FREEZING is initiated, transition to FROZEN is lazily updated by * calling this function. If the current state is FREEZING but not FROZEN, @@ -256,12 +256,12 @@ out: * update_if_frozen() on all descendants prior to invoking this function. * * Task states and freezer state might disagree while tasks are being - * migrated into or out of @cgroup, so we can't verify task states against + * migrated into or out of @css, so we can't verify task states against * @freezer state here. See freezer_attach() for details. */ -static void update_if_frozen(struct cgroup *cgroup) +static void update_if_frozen(struct cgroup_subsys_state *css) { - struct freezer *freezer = cgroup_freezer(cgroup); + struct freezer *freezer = css_freezer(css); struct cgroup *pos; struct cgroup_iter it; struct task_struct *task; @@ -275,7 +275,7 @@ static void update_if_frozen(struct cgroup *cgroup) goto out_unlock; /* are all (live) children frozen? */ - cgroup_for_each_child(pos, cgroup) { + cgroup_for_each_child(pos, css->cgroup) { struct freezer *child = cgroup_freezer(pos); if ((child->state & CGROUP_FREEZER_ONLINE) && @@ -284,9 +284,9 @@ static void update_if_frozen(struct cgroup *cgroup) } /* are all tasks frozen? */ - cgroup_iter_start(cgroup, &it); + cgroup_iter_start(css->cgroup, &it); - while ((task = cgroup_iter_next(cgroup, &it))) { + while ((task = cgroup_iter_next(css->cgroup, &it))) { if (freezing(task)) { /* * freezer_should_skip() indicates that the task @@ -301,12 +301,12 @@ static void update_if_frozen(struct cgroup *cgroup) freezer->state |= CGROUP_FROZEN; out_iter_end: - cgroup_iter_end(cgroup, &it); + cgroup_iter_end(css->cgroup, &it); out_unlock: spin_unlock_irq(&freezer->lock); } -static int freezer_read(struct cgroup *cgroup, struct cftype *cft, +static int freezer_read(struct cgroup_subsys_state *css, struct cftype *cft, struct seq_file *m) { struct cgroup *pos; @@ -314,13 +314,13 @@ static int freezer_read(struct cgroup *cgroup, struct cftype *cft, rcu_read_lock(); /* update states bottom-up */ - cgroup_for_each_descendant_post(pos, cgroup) - update_if_frozen(pos); - update_if_frozen(cgroup); + cgroup_for_each_descendant_post(pos, css->cgroup) + update_if_frozen(cgroup_css(pos, freezer_subsys_id)); + update_if_frozen(css); rcu_read_unlock(); - seq_puts(m, freezer_state_strs(cgroup_freezer(cgroup)->state)); + seq_puts(m, freezer_state_strs(css_freezer(css)->state)); seq_putc(m, '\n'); return 0; } @@ -426,7 +426,7 @@ static void freezer_change_state(struct freezer *freezer, bool freeze) rcu_read_unlock(); } -static int freezer_write(struct cgroup *cgroup, struct cftype *cft, +static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft, const char *buffer) { bool freeze; @@ -438,20 +438,22 @@ static int freezer_write(struct cgroup *cgroup, struct cftype *cft, else return -EINVAL; - freezer_change_state(cgroup_freezer(cgroup), freeze); + freezer_change_state(css_freezer(css), freeze); return 0; } -static u64 freezer_self_freezing_read(struct cgroup *cgroup, struct cftype *cft) +static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css, + struct cftype *cft) { - struct freezer *freezer = cgroup_freezer(cgroup); + struct freezer *freezer = css_freezer(css); return (bool)(freezer->state & CGROUP_FREEZING_SELF); } -static u64 freezer_parent_freezing_read(struct cgroup *cgroup, struct cftype *cft) +static u64 freezer_parent_freezing_read(struct cgroup_subsys_state *css, + struct cftype *cft) { - struct freezer *freezer = cgroup_freezer(cgroup); + struct freezer *freezer = css_freezer(css); return (bool)(freezer->state & CGROUP_FREEZING_PARENT); } -- cgit v1.2.3