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-rw-r--r--block/blk-cgroup.c49
1 files changed, 23 insertions, 26 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 290792a13e3c..e90c7c164c83 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -437,10 +437,10 @@ struct request_list *__blk_queue_next_rl(struct request_list *rl,
return &blkg->rl;
}
-static int blkcg_reset_stats(struct cgroup *cgroup, struct cftype *cftype,
- u64 val)
+static int blkcg_reset_stats(struct cgroup_subsys_state *css,
+ struct cftype *cftype, u64 val)
{
- struct blkcg *blkcg = cgroup_to_blkcg(cgroup);
+ struct blkcg *blkcg = css_to_blkcg(css);
struct blkcg_gq *blkg;
int i;
@@ -614,15 +614,13 @@ u64 blkg_stat_recursive_sum(struct blkg_policy_data *pd, int off)
{
struct blkcg_policy *pol = blkcg_policy[pd->plid];
struct blkcg_gq *pos_blkg;
- struct cgroup *pos_cgrp;
- u64 sum;
+ struct cgroup_subsys_state *pos_css;
+ u64 sum = 0;
lockdep_assert_held(pd->blkg->q->queue_lock);
- sum = blkg_stat_read((void *)pd + off);
-
rcu_read_lock();
- blkg_for_each_descendant_pre(pos_blkg, pos_cgrp, pd_to_blkg(pd)) {
+ blkg_for_each_descendant_pre(pos_blkg, pos_css, pd_to_blkg(pd)) {
struct blkg_policy_data *pos_pd = blkg_to_pd(pos_blkg, pol);
struct blkg_stat *stat = (void *)pos_pd + off;
@@ -649,16 +647,14 @@ struct blkg_rwstat blkg_rwstat_recursive_sum(struct blkg_policy_data *pd,
{
struct blkcg_policy *pol = blkcg_policy[pd->plid];
struct blkcg_gq *pos_blkg;
- struct cgroup *pos_cgrp;
- struct blkg_rwstat sum;
+ struct cgroup_subsys_state *pos_css;
+ struct blkg_rwstat sum = { };
int i;
lockdep_assert_held(pd->blkg->q->queue_lock);
- sum = blkg_rwstat_read((void *)pd + off);
-
rcu_read_lock();
- blkg_for_each_descendant_pre(pos_blkg, pos_cgrp, pd_to_blkg(pd)) {
+ blkg_for_each_descendant_pre(pos_blkg, pos_css, pd_to_blkg(pd)) {
struct blkg_policy_data *pos_pd = blkg_to_pd(pos_blkg, pol);
struct blkg_rwstat *rwstat = (void *)pos_pd + off;
struct blkg_rwstat tmp;
@@ -765,18 +761,18 @@ struct cftype blkcg_files[] = {
/**
* blkcg_css_offline - cgroup css_offline callback
- * @cgroup: cgroup of interest
+ * @css: css of interest
*
- * This function is called when @cgroup is about to go away and responsible
- * for shooting down all blkgs associated with @cgroup. blkgs should be
+ * This function is called when @css is about to go away and responsible
+ * for shooting down all blkgs associated with @css. blkgs should be
* removed while holding both q and blkcg locks. As blkcg lock is nested
* inside q lock, this function performs reverse double lock dancing.
*
* This is the blkcg counterpart of ioc_release_fn().
*/
-static void blkcg_css_offline(struct cgroup *cgroup)
+static void blkcg_css_offline(struct cgroup_subsys_state *css)
{
- struct blkcg *blkcg = cgroup_to_blkcg(cgroup);
+ struct blkcg *blkcg = css_to_blkcg(css);
spin_lock_irq(&blkcg->lock);
@@ -798,21 +794,21 @@ static void blkcg_css_offline(struct cgroup *cgroup)
spin_unlock_irq(&blkcg->lock);
}
-static void blkcg_css_free(struct cgroup *cgroup)
+static void blkcg_css_free(struct cgroup_subsys_state *css)
{
- struct blkcg *blkcg = cgroup_to_blkcg(cgroup);
+ struct blkcg *blkcg = css_to_blkcg(css);
if (blkcg != &blkcg_root)
kfree(blkcg);
}
-static struct cgroup_subsys_state *blkcg_css_alloc(struct cgroup *cgroup)
+static struct cgroup_subsys_state *
+blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
{
static atomic64_t id_seq = ATOMIC64_INIT(0);
struct blkcg *blkcg;
- struct cgroup *parent = cgroup->parent;
- if (!parent) {
+ if (!parent_css) {
blkcg = &blkcg_root;
goto done;
}
@@ -883,14 +879,15 @@ void blkcg_exit_queue(struct request_queue *q)
* of the main cic data structures. For now we allow a task to change
* its cgroup only if it's the only owner of its ioc.
*/
-static int blkcg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
+static int blkcg_can_attach(struct cgroup_subsys_state *css,
+ struct cgroup_taskset *tset)
{
struct task_struct *task;
struct io_context *ioc;
int ret = 0;
/* task_lock() is needed to avoid races with exit_io_context() */
- cgroup_taskset_for_each(task, cgrp, tset) {
+ cgroup_taskset_for_each(task, css, tset) {
task_lock(task);
ioc = task->io_context;
if (ioc && atomic_read(&ioc->nr_tasks) > 1)
@@ -1127,7 +1124,7 @@ void blkcg_policy_unregister(struct blkcg_policy *pol)
/* kill the intf files first */
if (pol->cftypes)
- cgroup_rm_cftypes(&blkio_subsys, pol->cftypes);
+ cgroup_rm_cftypes(pol->cftypes);
/* unregister and update blkgs */
blkcg_policy[pol->plid] = NULL;