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authorTejun Heo <tj@kernel.org>2015-08-18 23:55:15 +0200
committerJens Axboe <axboe@fb.com>2015-08-19 00:49:17 +0200
commit814376483e7d85b69a70634633f1f9d01c6ee0cf (patch)
tree04d6f2749e947f348a184e75e7bf1bea9ff7d163
parentblkcg: make blkcg_policy methods take a pointer to blkcg_policy_data (diff)
downloadlinux-814376483e7d85b69a70634633f1f9d01c6ee0cf.tar.xz
linux-814376483e7d85b69a70634633f1f9d01c6ee0cf.zip
blkcg: minor updates around blkcg_policy_data
* Rename blkcg->pd[] to blkcg->cpd[] so that cpd is consistently used for blkcg_policy_data. * Make blkcg_policy->cpd_init_fn() take blkcg_policy_data instead of blkcg. This makes it consistent with blkg_policy_data methods and to-be-added cpd alloc/free methods. * blkcg_policy_data->blkcg and cpd_to_blkcg() added so that cpd_init_fn() can determine the associated blkcg from blkcg_policy_data. v2: blkcg_policy_data->blkcg initializations were missing. Added. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>
-rw-r--r--block/blk-cgroup.c24
-rw-r--r--block/cfq-iosched.c11
-rw-r--r--include/linux/blk-cgroup.h14
3 files changed, 28 insertions, 21 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 8343450cffe2..247c42c8c83b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -821,7 +821,7 @@ static void blkcg_css_free(struct cgroup_subsys_state *css)
mutex_unlock(&blkcg_pol_mutex);
for (i = 0; i < BLKCG_MAX_POLS; i++)
- kfree(blkcg->pd[i]);
+ kfree(blkcg->cpd[i]);
kfree(blkcg);
}
@@ -857,15 +857,16 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
if (!pol || !pol->cpd_size)
continue;
- BUG_ON(blkcg->pd[i]);
+ BUG_ON(blkcg->cpd[i]);
cpd = kzalloc(pol->cpd_size, GFP_KERNEL);
if (!cpd) {
ret = ERR_PTR(-ENOMEM);
goto free_pd_blkcg;
}
- blkcg->pd[i] = cpd;
+ blkcg->cpd[i] = cpd;
+ cpd->blkcg = blkcg;
cpd->plid = i;
- pol->cpd_init_fn(blkcg);
+ pol->cpd_init_fn(cpd);
}
spin_lock_init(&blkcg->lock);
@@ -881,7 +882,7 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
free_pd_blkcg:
for (i--; i >= 0; i--)
- kfree(blkcg->pd[i]);
+ kfree(blkcg->cpd[i]);
free_blkcg:
kfree(blkcg);
mutex_unlock(&blkcg_pol_mutex);
@@ -1168,9 +1169,10 @@ int blkcg_policy_register(struct blkcg_policy *pol)
goto err_free_cpds;
}
- blkcg->pd[pol->plid] = cpd;
+ blkcg->cpd[pol->plid] = cpd;
+ cpd->blkcg = blkcg;
cpd->plid = pol->plid;
- pol->cpd_init_fn(blkcg);
+ pol->cpd_init_fn(cpd);
}
}
@@ -1186,8 +1188,8 @@ int blkcg_policy_register(struct blkcg_policy *pol)
err_free_cpds:
if (pol->cpd_size) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
- kfree(blkcg->pd[pol->plid]);
- blkcg->pd[pol->plid] = NULL;
+ kfree(blkcg->cpd[pol->plid]);
+ blkcg->cpd[pol->plid] = NULL;
}
}
blkcg_policy[pol->plid] = NULL;
@@ -1222,8 +1224,8 @@ void blkcg_policy_unregister(struct blkcg_policy *pol)
if (pol->cpd_size) {
list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) {
- kfree(blkcg->pd[pol->plid]);
- blkcg->pd[pol->plid] = NULL;
+ kfree(blkcg->cpd[pol->plid]);
+ blkcg->cpd[pol->plid] = NULL;
}
}
blkcg_policy[pol->plid] = NULL;
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 95e6b0cbaa84..dd6ea9ee6245 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -220,7 +220,7 @@ struct cfqg_stats {
/* Per-cgroup data */
struct cfq_group_data {
/* must be the first member */
- struct blkcg_policy_data pd;
+ struct blkcg_policy_data cpd;
unsigned int weight;
unsigned int leaf_weight;
@@ -612,7 +612,7 @@ static inline struct cfq_group *pd_to_cfqg(struct blkg_policy_data *pd)
static struct cfq_group_data
*cpd_to_cfqgd(struct blkcg_policy_data *cpd)
{
- return cpd ? container_of(cpd, struct cfq_group_data, pd) : NULL;
+ return cpd ? container_of(cpd, struct cfq_group_data, cpd) : NULL;
}
static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg)
@@ -1568,12 +1568,11 @@ static void cfqg_stats_init(struct cfqg_stats *stats)
#endif
}
-static void cfq_cpd_init(const struct blkcg *blkcg)
+static void cfq_cpd_init(struct blkcg_policy_data *cpd)
{
- struct cfq_group_data *cgd =
- cpd_to_cfqgd(blkcg->pd[blkcg_policy_cfq.plid]);
+ struct cfq_group_data *cgd = cpd_to_cfqgd(cpd);
- if (blkcg == &blkcg_root) {
+ if (cpd_to_blkcg(cpd) == &blkcg_root) {
cgd->weight = 2 * CFQ_WEIGHT_DEFAULT;
cgd->leaf_weight = 2 * CFQ_WEIGHT_DEFAULT;
} else {
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index ddd4b8b252c7..7988d4749fff 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -45,7 +45,7 @@ struct blkcg {
struct blkcg_gq *blkg_hint;
struct hlist_head blkg_list;
- struct blkcg_policy_data *pd[BLKCG_MAX_POLS];
+ struct blkcg_policy_data *cpd[BLKCG_MAX_POLS];
struct list_head all_blkcgs_node;
#ifdef CONFIG_CGROUP_WRITEBACK
@@ -88,7 +88,8 @@ struct blkg_policy_data {
* each policy handle per-blkcg data.
*/
struct blkcg_policy_data {
- /* the policy id this per-policy data belongs to */
+ /* the blkcg and policy id this per-policy data belongs to */
+ struct blkcg *blkcg;
int plid;
};
@@ -123,7 +124,7 @@ struct blkcg_gq {
struct rcu_head rcu_head;
};
-typedef void (blkcg_pol_init_cpd_fn)(const struct blkcg *blkcg);
+typedef void (blkcg_pol_init_cpd_fn)(struct blkcg_policy_data *cpd);
typedef struct blkg_policy_data *(blkcg_pol_alloc_pd_fn)(gfp_t gfp, int node);
typedef void (blkcg_pol_init_pd_fn)(struct blkg_policy_data *pd);
typedef void (blkcg_pol_online_pd_fn)(struct blkg_policy_data *pd);
@@ -243,7 +244,7 @@ static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg,
static inline struct blkcg_policy_data *blkcg_to_cpd(struct blkcg *blkcg,
struct blkcg_policy *pol)
{
- return blkcg ? blkcg->pd[pol->plid] : NULL;
+ return blkcg ? blkcg->cpd[pol->plid] : NULL;
}
/**
@@ -257,6 +258,11 @@ static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd)
return pd ? pd->blkg : NULL;
}
+static inline struct blkcg *cpd_to_blkcg(struct blkcg_policy_data *cpd)
+{
+ return cpd ? cpd->blkcg : NULL;
+}
+
/**
* blkg_path - format cgroup path of blkg
* @blkg: blkg of interest