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Message-Id: <1334273380-30233-9-git-send-email-tj@kernel.org>
Date: Thu, 12 Apr 2012 16:29:40 -0700
From: Tejun Heo <tj@...nel.org>
To: axboe@...nel.dk
Cc: vgoyal@...hat.com, ctalbott@...gle.com, rni@...gle.com,
linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
containers@...ts.linux-foundation.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 8/8] blkcg: drop stuff unused after per-queue policy activation update
* All_q_list is unused. Drop all_q_{mutex|list}.
* @for_root of blkg_lookup_create() is always %false when called from
outside blk-cgroup.c proper. Factor out __blkg_lookup_create() so
that it doesn't check whether @q is bypassing and use the
underscored version for the @for_root callsite.
* blkg_destroy_all() is used only from blkcg proper and @destroy_root
is always %true. Make it static and drop @destroy_root.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Vivek Goyal <vgoyal@...hat.com>
---
block/blk-cgroup.c | 61 ++++++++++++++++---------------------------------
block/blk-cgroup.h | 6 +----
block/blk-throttle.c | 2 +-
block/cfq-iosched.c | 2 +-
4 files changed, 23 insertions(+), 48 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index a92eaf9..be72e20 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -25,8 +25,6 @@
#define MAX_KEY_LEN 100
static DEFINE_MUTEX(blkcg_pol_mutex);
-static DEFINE_MUTEX(all_q_mutex);
-static LIST_HEAD(all_q_list);
struct blkio_cgroup blkio_root_cgroup = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT };
EXPORT_SYMBOL_GPL(blkio_root_cgroup);
@@ -179,9 +177,8 @@ struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
}
EXPORT_SYMBOL_GPL(blkg_lookup);
-struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
- struct request_queue *q,
- bool for_root)
+static struct blkio_group *__blkg_lookup_create(struct blkio_cgroup *blkcg,
+ struct request_queue *q)
__releases(q->queue_lock) __acquires(q->queue_lock)
{
struct blkio_group *blkg;
@@ -189,13 +186,6 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
WARN_ON_ONCE(!rcu_read_lock_held());
lockdep_assert_held(q->queue_lock);
- /*
- * This could be the first entry point of blkcg implementation and
- * we shouldn't allow anything to go through for a bypassing queue.
- */
- if (unlikely(blk_queue_bypass(q)) && !for_root)
- return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
-
blkg = __blkg_lookup(blkcg, q);
if (blkg)
return blkg;
@@ -223,6 +213,18 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
out:
return blkg;
}
+
+struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
+ struct request_queue *q)
+{
+ /*
+ * This could be the first entry point of blkcg implementation and
+ * we shouldn't allow anything to go through for a bypassing queue.
+ */
+ if (unlikely(blk_queue_bypass(q)))
+ return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
+ return __blkg_lookup_create(blkcg, q);
+}
EXPORT_SYMBOL_GPL(blkg_lookup_create);
static void blkg_destroy(struct blkio_group *blkg)
@@ -249,12 +251,10 @@ static void blkg_destroy(struct blkio_group *blkg)
/**
* blkg_destroy_all - destroy all blkgs associated with a request_queue
* @q: request_queue of interest
- * @destroy_root: whether to destroy root blkg or not
*
- * Destroy blkgs associated with @q. If @destroy_root is %true, all are
- * destroyed; otherwise, root blkg is left alone.
+ * Destroy all blkgs associated with @q.
*/
-void blkg_destroy_all(struct request_queue *q, bool destroy_root)
+static void blkg_destroy_all(struct request_queue *q)
{
struct blkio_group *blkg, *n;
@@ -263,10 +263,6 @@ void blkg_destroy_all(struct request_queue *q, bool destroy_root)
list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
struct blkio_cgroup *blkcg = blkg->blkcg;
- /* skip root? */
- if (!destroy_root && blkg->blkcg == &blkio_root_cgroup)
- continue;
-
spin_lock(&blkcg->lock);
blkg_destroy(blkg);
spin_unlock(&blkcg->lock);
@@ -274,7 +270,6 @@ void blkg_destroy_all(struct request_queue *q, bool destroy_root)
spin_unlock_irq(q->queue_lock);
}
-EXPORT_SYMBOL_GPL(blkg_destroy_all);
static void blkg_rcu_free(struct rcu_head *rcu_head)
{
@@ -492,7 +487,7 @@ int blkg_conf_prep(struct blkio_cgroup *blkcg,
spin_lock_irq(disk->queue->queue_lock);
if (blkcg_policy_enabled(disk->queue, pol))
- blkg = blkg_lookup_create(blkcg, disk->queue, false);
+ blkg = blkg_lookup_create(blkcg, disk->queue);
else
blkg = ERR_PTR(-EINVAL);
@@ -625,20 +620,9 @@ done:
*/
int blkcg_init_queue(struct request_queue *q)
{
- int ret;
-
might_sleep();
- ret = blk_throtl_init(q);
- if (ret)
- return ret;
-
- mutex_lock(&all_q_mutex);
- INIT_LIST_HEAD(&q->all_q_node);
- list_add_tail(&q->all_q_node, &all_q_list);
- mutex_unlock(&all_q_mutex);
-
- return 0;
+ return blk_throtl_init(q);
}
/**
@@ -662,12 +646,7 @@ void blkcg_drain_queue(struct request_queue *q)
*/
void blkcg_exit_queue(struct request_queue *q)
{
- mutex_lock(&all_q_mutex);
- list_del_init(&q->all_q_node);
- mutex_unlock(&all_q_mutex);
-
- blkg_destroy_all(q, true);
-
+ blkg_destroy_all(q);
blk_throtl_exit(q);
}
@@ -741,7 +720,7 @@ int blkcg_activate_policy(struct request_queue *q,
spin_lock_irq(q->queue_lock);
rcu_read_lock();
- blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
+ blkg = __blkg_lookup_create(&blkio_root_cgroup, q);
rcu_read_unlock();
if (IS_ERR(blkg)) {
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 519dc6b..1f5ebee 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -115,7 +115,6 @@ extern int blkcg_activate_policy(struct request_queue *q,
const struct blkio_policy_type *pol);
extern void blkcg_deactivate_policy(struct request_queue *q,
const struct blkio_policy_type *pol);
-extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
u64 (*prfill)(struct seq_file *, void *, int),
@@ -334,8 +333,6 @@ static inline int blkcg_activate_policy(struct request_queue *q,
const struct blkio_policy_type *pol) { return 0; }
static inline void blkcg_deactivate_policy(struct request_queue *q,
const struct blkio_policy_type *pol) { }
-static inline void blkg_destroy_all(struct request_queue *q,
- bool destory_root) { }
static inline void *blkg_to_pdata(struct blkio_group *blkg,
struct blkio_policy_type *pol) { return NULL; }
@@ -354,8 +351,7 @@ extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio);
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
struct request_queue *q);
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
- struct request_queue *q,
- bool for_root);
+ struct request_queue *q);
#else
struct cgroup;
static inline struct blkio_cgroup *
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 2fc964e..e2aaf27 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -285,7 +285,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
} else {
struct blkio_group *blkg;
- blkg = blkg_lookup_create(blkcg, q, false);
+ blkg = blkg_lookup_create(blkcg, q);
/* if %NULL and @q is alive, fall back to root_tg */
if (!IS_ERR(blkg))
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 947db5f..79987fb 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1349,7 +1349,7 @@ static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd,
} else {
struct blkio_group *blkg;
- blkg = blkg_lookup_create(blkcg, q, false);
+ blkg = blkg_lookup_create(blkcg, q);
if (!IS_ERR(blkg))
cfqg = blkg_to_cfqg(blkg);
}
--
1.7.7.3
--
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