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authorTejun Heo <tj@kernel.org>2015-08-19 00:55:15 +0300
committerJens Axboe <axboe@fb.com>2015-08-19 01:49:17 +0300
commit814376483e7d85b69a70634633f1f9d01c6ee0cf (patch)
tree04d6f2749e947f348a184e75e7bf1bea9ff7d163 /block
parenta9520cd6f2ac1fbbf206b915946534c6dddbaae2 (diff)
downloadlinux-814376483e7d85b69a70634633f1f9d01c6ee0cf.tar.xz
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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c24
-rw-r--r--block/cfq-iosched.c11
2 files changed, 18 insertions, 17 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 {