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-rw-r--r--block/blk-cgroup.c86
-rw-r--r--block/blk-cgroup.h53
-rw-r--r--block/blk-throttle.c79
-rw-r--r--block/cfq-iosched.c102
4 files changed, 209 insertions, 111 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 266c0707d588..14367499cfed 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -422,6 +422,70 @@ void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
}
EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats);
+/**
+ * blkg_free - free a blkg
+ * @blkg: blkg to free
+ *
+ * Free @blkg which may be partially allocated.
+ */
+static void blkg_free(struct blkio_group *blkg)
+{
+ if (blkg) {
+ free_percpu(blkg->stats_cpu);
+ kfree(blkg->pd);
+ kfree(blkg);
+ }
+}
+
+/**
+ * blkg_alloc - allocate a blkg
+ * @blkcg: block cgroup the new blkg is associated with
+ * @q: request_queue the new blkg is associated with
+ * @pol: policy the new blkg is associated with
+ *
+ * Allocate a new blkg assocating @blkcg and @q for @pol.
+ *
+ * FIXME: Should be called with queue locked but currently isn't due to
+ * percpu stat breakage.
+ */
+static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
+ struct request_queue *q,
+ struct blkio_policy_type *pol)
+{
+ struct blkio_group *blkg;
+
+ /* alloc and init base part */
+ blkg = kzalloc_node(sizeof(*blkg), GFP_ATOMIC, q->node);
+ if (!blkg)
+ return NULL;
+
+ spin_lock_init(&blkg->stats_lock);
+ rcu_assign_pointer(blkg->q, q);
+ blkg->blkcg = blkcg;
+ blkg->plid = pol->plid;
+ cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
+
+ /* alloc per-policy data */
+ blkg->pd = kzalloc_node(sizeof(*blkg->pd) + pol->pdata_size, GFP_ATOMIC,
+ q->node);
+ if (!blkg->pd) {
+ blkg_free(blkg);
+ return NULL;
+ }
+
+ /* broken, read comment in the callsite */
+ blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
+ if (!blkg->stats_cpu) {
+ blkg_free(blkg);
+ return NULL;
+ }
+
+ /* attach pd to blkg and invoke per-policy init */
+ blkg->pd->blkg = blkg;
+ pol->ops.blkio_init_group_fn(blkg);
+ return blkg;
+}
+
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
struct request_queue *q,
enum blkio_policy_id plid,
@@ -463,19 +527,7 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();
- new_blkg = pol->ops.blkio_alloc_group_fn(q, blkcg);
- if (new_blkg) {
- new_blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
-
- spin_lock_init(&new_blkg->stats_lock);
- rcu_assign_pointer(new_blkg->q, q);
- new_blkg->blkcg = blkcg;
- new_blkg->plid = plid;
- cgroup_path(blkcg->css.cgroup, new_blkg->path,
- sizeof(new_blkg->path));
- } else {
- css_put(&blkcg->css);
- }
+ new_blkg = blkg_alloc(blkcg, q, pol);
rcu_read_lock();
spin_lock_irq(q->queue_lock);
@@ -492,7 +544,7 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
goto out;
/* did alloc fail? */
- if (unlikely(!new_blkg || !new_blkg->stats_cpu)) {
+ if (unlikely(!new_blkg)) {
blkg = ERR_PTR(-ENOMEM);
goto out;
}
@@ -504,11 +556,7 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
pol->ops.blkio_link_group_fn(q, blkg);
spin_unlock(&blkcg->lock);
out:
- if (new_blkg) {
- free_percpu(new_blkg->stats_cpu);
- kfree(new_blkg);
- css_put(&blkcg->css);
- }
+ blkg_free(new_blkg);
return blkg;
}
EXPORT_SYMBOL_GPL(blkg_lookup_create);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 3bc171080e93..9537819c29c6 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -159,6 +159,15 @@ struct blkio_group_conf {
u64 bps[2];
};
+/* per-blkg per-policy data */
+struct blkg_policy_data {
+ /* the blkg this per-policy data belongs to */
+ struct blkio_group *blkg;
+
+ /* pol->pdata_size bytes of private data used by policy impl */
+ char pdata[] __aligned(__alignof__(unsigned long long));
+};
+
struct blkio_group {
/* Pointer to the associated request_queue, RCU protected */
struct request_queue __rcu *q;
@@ -177,10 +186,11 @@ struct blkio_group {
struct blkio_group_stats stats;
/* Per cpu stats pointer */
struct blkio_group_stats_cpu __percpu *stats_cpu;
+
+ struct blkg_policy_data *pd;
};
-typedef struct blkio_group *(blkio_alloc_group_fn)(struct request_queue *q,
- struct blkio_cgroup *blkcg);
+typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
typedef void (blkio_link_group_fn)(struct request_queue *q,
struct blkio_group *blkg);
typedef void (blkio_unlink_group_fn)(struct request_queue *q,
@@ -198,7 +208,7 @@ typedef void (blkio_update_group_write_iops_fn)(struct request_queue *q,
struct blkio_group *blkg, unsigned int write_iops);
struct blkio_policy_ops {
- blkio_alloc_group_fn *blkio_alloc_group_fn;
+ blkio_init_group_fn *blkio_init_group_fn;
blkio_link_group_fn *blkio_link_group_fn;
blkio_unlink_group_fn *blkio_unlink_group_fn;
blkio_clear_queue_fn *blkio_clear_queue_fn;
@@ -213,6 +223,7 @@ struct blkio_policy_type {
struct list_head list;
struct blkio_policy_ops ops;
enum blkio_policy_id plid;
+ size_t pdata_size; /* policy specific private data size */
};
extern int blkcg_init_queue(struct request_queue *q);
@@ -224,6 +235,38 @@ extern void blkio_policy_register(struct blkio_policy_type *);
extern void blkio_policy_unregister(struct blkio_policy_type *);
extern void blkg_destroy_all(struct request_queue *q);
+/**
+ * blkg_to_pdata - get policy private data
+ * @blkg: blkg of interest
+ * @pol: policy of interest
+ *
+ * Return pointer to private data associated with the @blkg-@pol pair.
+ */
+static inline void *blkg_to_pdata(struct blkio_group *blkg,
+ struct blkio_policy_type *pol)
+{
+ return blkg ? blkg->pd->pdata : NULL;
+}
+
+/**
+ * pdata_to_blkg - get blkg associated with policy private data
+ * @pdata: policy private data of interest
+ * @pol: policy @pdata is for
+ *
+ * @pdata is policy private data for @pol. Determine the blkg it's
+ * associated with.
+ */
+static inline struct blkio_group *pdata_to_blkg(void *pdata,
+ struct blkio_policy_type *pol)
+{
+ if (pdata) {
+ struct blkg_policy_data *pd =
+ container_of(pdata, struct blkg_policy_data, pdata);
+ return pd->blkg;
+ }
+ return NULL;
+}
+
static inline char *blkg_path(struct blkio_group *blkg)
{
return blkg->path;
@@ -244,6 +287,10 @@ static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
static inline void blkg_destroy_all(struct request_queue *q) { }
+static inline void *blkg_to_pdata(struct blkio_group *blkg,
+ struct blkio_policy_type *pol) { return NULL; }
+static inline struct blkio_group *pdata_to_blkg(void *pdata,
+ struct blkio_policy_type *pol) { return NULL; }
static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
#endif
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index ac6d0fe6e4ee..9c8a12477e13 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -21,6 +21,8 @@ static int throtl_quantum = 32;
/* Throttling is performed over 100ms slice and after that slice is renewed */
static unsigned long throtl_slice = HZ/10; /* 100 ms */
+static struct blkio_policy_type blkio_policy_throtl;
+
/* A workqueue to queue throttle related work */
static struct workqueue_struct *kthrotld_workqueue;
static void throtl_schedule_delayed_work(struct throtl_data *td,
@@ -52,7 +54,6 @@ struct throtl_grp {
*/
unsigned long disptime;
- struct blkio_group blkg;
atomic_t ref;
unsigned int flags;
@@ -108,6 +109,16 @@ struct throtl_data
int limits_changed;
};
+static inline struct throtl_grp *blkg_to_tg(struct blkio_group *blkg)
+{
+ return blkg_to_pdata(blkg, &blkio_policy_throtl);
+}
+
+static inline struct blkio_group *tg_to_blkg(struct throtl_grp *tg)
+{
+ return pdata_to_blkg(tg, &blkio_policy_throtl);
+}
+
enum tg_state_flags {
THROTL_TG_FLAG_on_rr = 0, /* on round-robin busy list */
};
@@ -130,19 +141,11 @@ THROTL_TG_FNS(on_rr);
#define throtl_log_tg(td, tg, fmt, args...) \
blk_add_trace_msg((td)->queue, "throtl %s " fmt, \
- blkg_path(&(tg)->blkg), ##args); \
+ blkg_path(tg_to_blkg(tg)), ##args); \
#define throtl_log(td, fmt, args...) \
blk_add_trace_msg((td)->queue, "throtl " fmt, ##args)
-static inline struct throtl_grp *tg_of_blkg(struct blkio_group *blkg)
-{
- if (blkg)
- return container_of(blkg, struct throtl_grp, blkg);
-
- return NULL;
-}
-
static inline unsigned int total_nr_queued(struct throtl_data *td)
{
return td->nr_queued[0] + td->nr_queued[1];
@@ -156,21 +159,24 @@ static inline struct throtl_grp *throtl_ref_get_tg(struct throtl_grp *tg)
static void throtl_free_tg(struct rcu_head *head)
{
- struct throtl_grp *tg;
+ struct throtl_grp *tg = container_of(head, struct throtl_grp, rcu_head);
+ struct blkio_group *blkg = tg_to_blkg(tg);
- tg = container_of(head, struct throtl_grp, rcu_head);
- free_percpu(tg->blkg.stats_cpu);
- kfree(tg);
+ free_percpu(blkg->stats_cpu);
+ kfree(blkg->pd);
+ kfree(blkg);
}
static void throtl_put_tg(struct throtl_grp *tg)
{
+ struct blkio_group *blkg = tg_to_blkg(tg);
+
BUG_ON(atomic_read(&tg->ref) <= 0);
if (!atomic_dec_and_test(&tg->ref))
return;
/* release the extra blkcg reference this blkg has been holding */
- css_put(&tg->blkg.blkcg->css);
+ css_put(&blkg->blkcg->css);
/*
* A group is freed in rcu manner. But having an rcu lock does not
@@ -184,14 +190,9 @@ static void throtl_put_tg(struct throtl_grp *tg)
call_rcu(&tg->rcu_head, throtl_free_tg);
}
-static struct blkio_group *throtl_alloc_blkio_group(struct request_queue *q,
- struct blkio_cgroup *blkcg)
+static void throtl_init_blkio_group(struct blkio_group *blkg)
{
- struct throtl_grp *tg;
-
- tg = kzalloc_node(sizeof(*tg), GFP_ATOMIC, q->node);
- if (!tg)
- return NULL;
+ struct throtl_grp *tg = blkg_to_tg(blkg);
INIT_HLIST_NODE(&tg->tg_node);
RB_CLEAR_NODE(&tg->rb_node);
@@ -211,15 +212,13 @@ static struct blkio_group *throtl_alloc_blkio_group(struct request_queue *q,
* exit or cgroup deletion path depending on who is exiting first.
*/
atomic_set(&tg->ref, 1);
-
- return &tg->blkg;
}
static void throtl_link_blkio_group(struct request_queue *q,
struct blkio_group *blkg)
{
struct throtl_data *td = q->td;
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
hlist_add_head(&tg->tg_node, &td->tg_list);
td->nr_undestroyed_grps++;
@@ -235,7 +234,7 @@ throtl_grp *throtl_lookup_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
if (blkcg == &blkio_root_cgroup)
return td->root_tg;
- return tg_of_blkg(blkg_lookup(blkcg, td->queue, BLKIO_POLICY_THROTL));
+ return blkg_to_tg(blkg_lookup(blkcg, td->queue, BLKIO_POLICY_THROTL));
}
static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
@@ -257,7 +256,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
/* if %NULL and @q is alive, fall back to root_tg */
if (!IS_ERR(blkg))
- tg = tg_of_blkg(blkg);
+ tg = blkg_to_tg(blkg);
else if (!blk_queue_dead(q))
tg = td->root_tg;
}
@@ -639,7 +638,7 @@ static void throtl_charge_bio(struct throtl_grp *tg, struct bio *bio)
tg->bytes_disp[rw] += bio->bi_size;
tg->io_disp[rw]++;
- blkiocg_update_dispatch_stats(&tg->blkg, bio->bi_size, rw, sync);
+ blkiocg_update_dispatch_stats(tg_to_blkg(tg), bio->bi_size, rw, sync);
}
static void throtl_add_bio_tg(struct throtl_data *td, struct throtl_grp *tg,
@@ -901,7 +900,7 @@ static bool throtl_release_tgs(struct throtl_data *td, bool release_root)
* it from cgroup list, then it will take care of destroying
* cfqg also.
*/
- if (!blkiocg_del_blkio_group(&tg->blkg))
+ if (!blkiocg_del_blkio_group(tg_to_blkg(tg)))
throtl_destroy_tg(td, tg);
else
empty = false;
@@ -929,7 +928,7 @@ void throtl_unlink_blkio_group(struct request_queue *q,
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
- throtl_destroy_tg(q->td, tg_of_blkg(blkg));
+ throtl_destroy_tg(q->td, blkg_to_tg(blkg));
spin_unlock_irqrestore(q->queue_lock, flags);
}
@@ -968,7 +967,7 @@ static void throtl_update_blkio_group_common(struct throtl_data *td,
static void throtl_update_blkio_group_read_bps(struct request_queue *q,
struct blkio_group *blkg, u64 read_bps)
{
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
tg->bps[READ] = read_bps;
throtl_update_blkio_group_common(q->td, tg);
@@ -977,7 +976,7 @@ static void throtl_update_blkio_group_read_bps(struct request_queue *q,
static void throtl_update_blkio_group_write_bps(struct request_queue *q,
struct blkio_group *blkg, u64 write_bps)
{
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
tg->bps[WRITE] = write_bps;
throtl_update_blkio_group_common(q->td, tg);
@@ -986,7 +985,7 @@ static void throtl_update_blkio_group_write_bps(struct request_queue *q,
static void throtl_update_blkio_group_read_iops(struct request_queue *q,
struct blkio_group *blkg, unsigned int read_iops)
{
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
tg->iops[READ] = read_iops;
throtl_update_blkio_group_common(q->td, tg);
@@ -995,7 +994,7 @@ static void throtl_update_blkio_group_read_iops(struct request_queue *q,
static void throtl_update_blkio_group_write_iops(struct request_queue *q,
struct blkio_group *blkg, unsigned int write_iops)
{
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
tg->iops[WRITE] = write_iops;
throtl_update_blkio_group_common(q->td, tg);
@@ -1010,7 +1009,7 @@ static void throtl_shutdown_wq(struct request_queue *q)
static struct blkio_policy_type blkio_policy_throtl = {
.ops = {
- .blkio_alloc_group_fn = throtl_alloc_blkio_group,
+ .blkio_init_group_fn = throtl_init_blkio_group,
.blkio_link_group_fn = throtl_link_blkio_group,
.blkio_unlink_group_fn = throtl_unlink_blkio_group,
.blkio_clear_queue_fn = throtl_clear_queue,
@@ -1024,6 +1023,7 @@ static struct blkio_policy_type blkio_policy_throtl = {
throtl_update_blkio_group_write_iops,
},
.plid = BLKIO_POLICY_THROTL,
+ .pdata_size = sizeof(struct throtl_grp),
};
bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
@@ -1049,8 +1049,9 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
tg = throtl_lookup_tg(td, blkcg);
if (tg) {
if (tg_no_rule_group(tg, rw)) {
- blkiocg_update_dispatch_stats(&tg->blkg, bio->bi_size,
- rw, rw_is_sync(bio->bi_rw));
+ blkiocg_update_dispatch_stats(tg_to_blkg(tg),
+ bio->bi_size, rw,
+ rw_is_sync(bio->bi_rw));
goto out_unlock_rcu;
}
}
@@ -1176,7 +1177,7 @@ int blk_throtl_init(struct request_queue *q)
blkg = blkg_lookup_create(&blkio_root_cgroup, q, BLKIO_POLICY_THROTL,
true);
if (!IS_ERR(blkg))
- td->root_tg = tg_of_blkg(blkg);
+ td->root_tg = blkg_to_tg(blkg);
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();
@@ -1207,7 +1208,7 @@ void blk_throtl_exit(struct request_queue *q)
spin_unlock_irq(q->queue_lock);
/*
- * Wait for tg->blkg->q accessors to exit their grace periods.
+ * Wait for tg_to_blkg(tg)->q accessors to exit their grace periods.
* Do this wait only if there are other undestroyed groups out
* there (other than root group). This can happen if cgroup deletion
* path claimed the responsibility of cleaning up a group before
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 9ef86fbfc9ae..c7449db52a86 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -17,6 +17,8 @@
#include "blk.h"
#include "cfq.h"
+static struct blkio_policy_type blkio_policy_cfq;
+
/*
* tunables
*/
@@ -206,7 +208,6 @@ struct cfq_group {
unsigned long saved_workload_slice;
enum wl_type_t saved_workload;
enum wl_prio_t saved_serving_prio;
- struct blkio_group blkg;
#ifdef CONFIG_CFQ_GROUP_IOSCHED
struct hlist_node cfqd_node;
int ref;
@@ -310,6 +311,16 @@ struct cfq_data {
unsigned int nr_blkcg_linked_grps;
};
+static inline struct cfq_group *blkg_to_cfqg(struct blkio_group *blkg)
+{
+ return blkg_to_pdata(blkg, &blkio_policy_cfq);
+}
+
+static inline struct blkio_group *cfqg_to_blkg(struct cfq_group *cfqg)
+{
+ return pdata_to_blkg(cfqg, &blkio_policy_cfq);
+}
+
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd);
static struct cfq_rb_root *service_tree_for(struct cfq_group *cfqg,
@@ -374,11 +385,11 @@ CFQ_CFQQ_FNS(wait_busy);
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
- blkg_path(&(cfqq)->cfqg->blkg), ##args)
+ blkg_path(cfqg_to_blkg((cfqq)->cfqg)), ##args)
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "%s " fmt, \
- blkg_path(&(cfqg)->blkg), ##args) \
+ blkg_path(cfqg_to_blkg((cfqg))), ##args) \
#else
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
@@ -935,7 +946,7 @@ cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
cfq_group_service_tree_del(st, cfqg);
cfqg->saved_workload_slice = 0;
- cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
+ cfq_blkiocg_update_dequeue_stats(cfqg_to_blkg(cfqg), 1);
}
static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq,
@@ -1007,9 +1018,9 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
"sl_used=%u disp=%u charge=%u iops=%u sect=%lu",
used_sl, cfqq->slice_dispatch, charge,
iops_mode(cfqd), cfqq->nr_sectors);
- cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl,
+ cfq_blkiocg_update_timeslice_used(cfqg_to_blkg(cfqg), used_sl,
unaccounted_sl);
- cfq_blkiocg_set_start_empty_time(&cfqg->blkg);
+ cfq_blkiocg_set_start_empty_time(cfqg_to_blkg(cfqg));
}
/**
@@ -1032,18 +1043,12 @@ static void cfq_init_cfqg_base(struct cfq_group *cfqg)
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
-static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg)
-{
- if (blkg)
- return container_of(blkg, struct cfq_group, blkg);
- return NULL;
-}
-
static void cfq_update_blkio_group_weight(struct request_queue *q,
struct blkio_group *blkg,
unsigned int weight)
{
- struct cfq_group *cfqg = cfqg_of_blkg(blkg);
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);
+
cfqg->new_weight = weight;
cfqg->needs_update = true;
}
@@ -1052,7 +1057,7 @@ static void cfq_link_blkio_group(struct request_queue *q,
struct blkio_group *blkg)
{
struct cfq_data *cfqd = q->elevator->elevator_data;
- struct cfq_group *cfqg = cfqg_of_blkg(blkg);
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);
cfqd->nr_blkcg_linked_grps++;
@@ -1060,17 +1065,12 @@ static void cfq_link_blkio_group(struct request_queue *q,
hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);
}
-static struct blkio_group *cfq_alloc_blkio_group(struct request_queue *q,
- struct blkio_cgroup *blkcg)
+static void cfq_init_blkio_group(struct blkio_group *blkg)
{
- struct cfq_group *cfqg;
-
- cfqg = kzalloc_node(sizeof(*cfqg), GFP_ATOMIC, q->node);
- if (!cfqg)
- return NULL;
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);
cfq_init_cfqg_base(cfqg);
- cfqg->weight = blkcg->weight;
+ cfqg->weight = blkg->blkcg->weight;
/*
* Take the initial reference that will be released on destroy
@@ -1079,8 +1079,6 @@ static struct blkio_group *cfq_alloc_blkio_group(struct request_queue *q,
* or cgroup deletion path depending on who is exiting first.
*/
cfqg->ref = 1;
-
- return &cfqg->blkg;
}
/*
@@ -1101,7 +1099,7 @@ static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd,
blkg = blkg_lookup_create(blkcg, q, BLKIO_POLICY_PROP, false);
if (!IS_ERR(blkg))
- cfqg = cfqg_of_blkg(blkg);
+ cfqg = blkg_to_cfqg(blkg);
}
return cfqg;
@@ -1126,6 +1124,7 @@ static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg)
static void cfq_put_cfqg(struct cfq_group *cfqg)
{
+ struct blkio_group *blkg = cfqg_to_blkg(cfqg);
struct cfq_rb_root *st;
int i, j;
@@ -1135,12 +1134,13 @@ static void cfq_put_cfqg(struct cfq_group *cfqg)
return;
/* release the extra blkcg reference this blkg has been holding */
- css_put(&cfqg->blkg.blkcg->css);
+ css_put(&blkg->blkcg->css);
for_each_cfqg_st(cfqg, i, j, st)
BUG_ON(!RB_EMPTY_ROOT(&st->rb));
- free_percpu(cfqg->blkg.stats_cpu);
- kfree(cfqg);
+ free_percpu(blkg->stats_cpu);
+ kfree(blkg->pd);
+ kfree(blkg);
}
static void cfq_destroy_cfqg(struct cfq_data *cfqd, struct cfq_group *cfqg)
@@ -1172,7 +1172,7 @@ static bool cfq_release_cfq_groups(struct cfq_data *cfqd)
* it from cgroup list, then it will take care of destroying
* cfqg also.
*/
- if (!cfq_blkiocg_del_blkio_group(&cfqg->blkg))
+ if (!cfq_blkiocg_del_blkio_group(cfqg_to_blkg(cfqg)))
cfq_destroy_cfqg(cfqd, cfqg);
else
empty = false;
@@ -1201,7 +1201,7 @@ static void cfq_unlink_blkio_group(struct request_queue *q,
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
- cfq_destroy_cfqg(cfqd, cfqg_of_blkg(blkg));
+ cfq_destroy_cfqg(cfqd, blkg_to_cfqg(blkg));
spin_unlock_irqrestore(q->queue_lock, flags);
}
@@ -1504,12 +1504,12 @@ static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq)
{
elv_rb_del(&cfqq->sort_list, rq);
cfqq->queued[rq_is_sync(rq)]--;
- cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
+ cfq_blkiocg_update_io_remove_stats(cfqg_to_blkg(RQ_CFQG(rq)),
rq_data_dir(rq), rq_is_sync(rq));
cfq_add_rq_rb(rq);
- cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
- &cfqq->cfqd->serving_group->blkg, rq_data_dir(rq),
- rq_is_sync(rq));
+ cfq_blkiocg_update_io_add_stats(cfqg_to_blkg(RQ_CFQG(rq)),
+ cfqg_to_blkg(cfqq->cfqd->serving_group),
+ rq_data_dir(rq), rq_is_sync(rq));
}
static struct request *
@@ -1565,7 +1565,7 @@ static void cfq_remove_request(struct request *rq)
cfq_del_rq_rb(rq);
cfqq->cfqd->rq_queued--;
- cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
+ cfq_blkiocg_update_io_remove_stats(cfqg_to_blkg(RQ_CFQG(rq)),
rq_data_dir(rq), rq_is_sync(rq));
if (rq->cmd_flags & REQ_PRIO) {
WARN_ON(!cfqq->prio_pending);
@@ -1601,7 +1601,7 @@ static void cfq_merged_request(struct request_queue *q, struct request *req,
static void cfq_bio_merged(struct request_queue *q, struct request *req,
struct bio *bio)
{
- cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg,
+ cfq_blkiocg_update_io_merged_stats(cfqg_to_blkg(RQ_CFQG(req)),
bio_data_dir(bio), cfq_bio_sync(bio));
}
@@ -1624,7 +1624,7 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
if (cfqq->next_rq == next)
cfqq->next_rq = rq;
cfq_remove_request(next);
- cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg,
+ cfq_blkiocg_update_io_merged_stats(cfqg_to_blkg(RQ_CFQG(rq)),
rq_data_dir(next), rq_is_sync(next));
cfqq = RQ_CFQQ(next);
@@ -1666,7 +1666,7 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
del_timer(&cfqd->idle_slice_timer);
- cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
+ cfq_blkiocg_update_idle_time_stats(cfqg_to_blkg(cfqq->cfqg));
}
static void __cfq_set_active_queue(struct cfq_data *cfqd,
@@ -1675,7 +1675,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
if (cfqq) {
cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d",
cfqd->serving_prio, cfqd->serving_type);
- cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
+ cfq_blkiocg_update_avg_queue_size_stats(cfqg_to_blkg(cfqq->cfqg));
cfqq->slice_start = 0;
cfqq->dispatch_start = jiffies;
cfqq->allocated_slice = 0;
@@ -2023,7 +2023,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
sl = cfqd->cfq_slice_idle;
mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
- cfq_blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
+ cfq_blkiocg_update_set_idle_time_stats(cfqg_to_blkg(cfqq->cfqg));
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu group_idle: %d", sl,
group_idle ? 1 : 0);
}
@@ -2046,8 +2046,9 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq)
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;
cfqq->nr_sectors += blk_rq_sectors(rq);
- cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),
- rq_data_dir(rq), rq_is_sync(rq));
+ cfq_blkiocg_update_dispatch_stats(cfqg_to_blkg(cfqq->cfqg),
+ blk_rq_bytes(rq), rq_data_dir(rq),
+ rq_is_sync(rq));
}
/*
@@ -3135,7 +3136,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
__blk_run_queue(cfqd->queue);
} else {
cfq_blkiocg_update_idle_time_stats(
- &cfqq->cfqg->blkg);
+ cfqg_to_blkg(cfqq->cfqg));
cfq_mark_cfqq_must_dispatch(cfqq);
}
}
@@ -3162,9 +3163,9 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);
list_add_tail(&rq->queuelist, &cfqq->fifo);
cfq_add_rq_rb(rq);
- cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
- &cfqd->serving_group->blkg, rq_data_dir(rq),
- rq_is_sync(rq));
+ cfq_blkiocg_update_io_add_stats(cfqg_to_blkg(RQ_CFQG(rq)),
+ cfqg_to_blkg(cfqd->serving_group),
+ rq_data_dir(rq), rq_is_sync(rq));
cfq_rq_enqueued(cfqd, cfqq, rq);
}
@@ -3260,7 +3261,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
cfqd->rq_in_driver--;
cfqq->dispatched--;
(RQ_CFQG(rq))->dispatched--;
- cfq_blkiocg_update_completion_stats(&cfqq->cfqg->blkg,
+ cfq_blkiocg_update_completion_stats(cfqg_to_blkg(cfqq->cfqg),
rq_start_time_ns(rq), rq_io_start_time_ns(rq),
rq_data_dir(rq), rq_is_sync(rq));
@@ -3641,7 +3642,7 @@ static int cfq_init_queue(struct request_queue *q)
blkg = blkg_lookup_create(&blkio_root_cgroup, q, BLKIO_POLICY_PROP,
true);
if (!IS_ERR(blkg))
- cfqd->root_group = cfqg_of_blkg(blkg);
+ cfqd->root_group = blkg_to_cfqg(blkg);
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();
@@ -3827,13 +3828,14 @@ static struct elevator_type iosched_cfq = {
#ifdef CONFIG_CFQ_GROUP_IOSCHED
static struct blkio_policy_type blkio_policy_cfq = {
.ops = {
- .blkio_alloc_group_fn = cfq_alloc_blkio_group,
+ .blkio_init_group_fn = cfq_init_blkio_group,
.blkio_link_group_fn = cfq_link_blkio_group,
.blkio_unlink_group_fn = cfq_unlink_blkio_group,
.blkio_clear_queue_fn = cfq_clear_queue,
.blkio_update_group_weight_fn = cfq_update_blkio_group_weight,
},
.plid = BLKIO_POLICY_PROP,
+ .pdata_size = sizeof(struct cfq_group),
};
#endif
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-12 02:45:09 +0000