[PATCH 1/5] Revert "blk-cgroup: move the cgroup information to struct gendisk"

Christoph Hellwig
2023-02-14T18:33:04Z

This reverts commit 3f13ab7c80fdb0ada86a8e3e818960bc1ccbaa59 as a patch
it depends on caused a few problems.

Signed-off-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
---
block/bfq-cgroup.c | 4 +--
block/blk-cgroup.c | 66 +++++++++++++++++++++---------------------
block/blk-cgroup.h | 4 +--
block/blk-iolatency.c | 2 +-
block/blk-throttle.c | 16 ++++------
include/linux/blkdev.h | 12 ++++----
6 files changed, 50 insertions(+), 54 deletions(-)

diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index 624530643a05cd..935a497b5dedb3 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -999,7 +999,7 @@ void bfq_end_wr_async(struct bfq_data *bfqd)
{
struct blkcg_gq *blkg;

- list_for_each_entry(blkg, &bfqd->queue->disk->blkg_list, entry) {
+ list_for_each_entry(blkg, &bfqd->queue->blkg_list, q_node) {
struct bfq_group *bfqg = blkg_to_bfqg(blkg);

bfq_end_wr_async_queues(bfqd, bfqg);
@@ -1293,7 +1293,7 @@ struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node)
if (ret)
return NULL;

- return blkg_to_bfqg(bfqd->queue->disk->root_blkg);
+ return blkg_to_bfqg(bfqd->queue->root_blkg);
}

struct blkcg_policy blkcg_policy_bfq = {
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 935028912e7abf..1653786644eab1 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -108,10 +108,10 @@ static struct cgroup_subsys_state *blkcg_css(void)
return task_css(current, io_cgrp_id);
}

-static bool blkcg_policy_enabled(struct gendisk *disk,
+static bool blkcg_policy_enabled(struct request_queue *q,
const struct blkcg_policy *pol)
{
- return pol && test_bit(pol->plid, disk->blkcg_pols);
+ return pol && test_bit(pol->plid, q->blkcg_pols);
}

static void blkg_free_workfn(struct work_struct *work)
@@ -123,18 +123,18 @@ static void blkg_free_workfn(struct work_struct *work)
/*
* pd_free_fn() can also be called from blkcg_deactivate_policy(),
* in order to make sure pd_free_fn() is called in order, the deletion
- * of the list blkg->entry is delayed to here from blkg_destroy(), and
+ * of the list blkg->q_node is delayed to here from blkg_destroy(), and
* blkcg_mutex is used to synchronize blkg_free_workfn() and
* blkcg_deactivate_policy().
*/
- mutex_lock(&blkg->disk->blkcg_mutex);
+ mutex_lock(&blkg->disk->queue->blkcg_mutex);
for (i = 0; i < BLKCG_MAX_POLS; i++)
if (blkg->pd[i])
blkcg_policy[i]->pd_free_fn(blkg->pd[i]);
if (blkg->parent)
blkg_put(blkg->parent);
- list_del_init(&blkg->entry);
- mutex_unlock(&blkg->disk->blkcg_mutex);
+ list_del_init(&blkg->q_node);
+ mutex_unlock(&blkg->disk->queue->blkcg_mutex);

put_disk(blkg->disk);
free_percpu(blkg->iostat_cpu);
@@ -269,7 +269,7 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct gendisk *disk,
get_device(disk_to_dev(disk));
blkg->disk = disk;

- INIT_LIST_HEAD(&blkg->entry);
+ INIT_LIST_HEAD(&blkg->q_node);
spin_lock_init(&blkg->async_bio_lock);
bio_list_init(&blkg->async_bios);
INIT_WORK(&blkg->async_bio_work, blkg_async_bio_workfn);
@@ -285,7 +285,7 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct gendisk *disk,
struct blkcg_policy *pol = blkcg_policy[i];
struct blkg_policy_data *pd;

- if (!blkcg_policy_enabled(disk, pol))
+ if (!blkcg_policy_enabled(disk->queue, pol))
continue;

/* alloc per-policy data and attach it to blkg */
@@ -371,7 +371,7 @@ static struct blkcg_gq *blkg_create(struct blkcg *blkcg, struct gendisk *disk,
ret = radix_tree_insert(&blkcg->blkg_tree, disk->queue->id, blkg);
if (likely(!ret)) {
hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);
- list_add(&blkg->entry, &disk->blkg_list);
+ list_add(&blkg->q_node, &disk->queue->blkg_list);

for (i = 0; i < BLKCG_MAX_POLS; i++) {
struct blkcg_policy *pol = blkcg_policy[i];
@@ -444,7 +444,7 @@ static struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
while (true) {
struct blkcg *pos = blkcg;
struct blkcg *parent = blkcg_parent(blkcg);
- struct blkcg_gq *ret_blkg = disk->root_blkg;
+ struct blkcg_gq *ret_blkg = q->root_blkg;

while (parent) {
blkg = blkg_lookup(parent, disk);
@@ -526,7 +526,7 @@ static void blkg_destroy_all(struct gendisk *disk)

restart:
spin_lock_irq(&q->queue_lock);
- list_for_each_entry_safe(blkg, n, &disk->blkg_list, entry) {
+ list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
struct blkcg *blkcg = blkg->blkcg;

spin_lock(&blkcg->lock);
@@ -545,7 +545,7 @@ static void blkg_destroy_all(struct gendisk *disk)
}
}

- disk->root_blkg = NULL;
+ q->root_blkg = NULL;
spin_unlock_irq(&q->queue_lock);
}

@@ -620,7 +620,7 @@ void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg,
rcu_read_lock();
hlist_for_each_entry_rcu(blkg, &blkcg->blkg_list, blkcg_node) {
spin_lock_irq(&blkg->disk->queue->queue_lock);
- if (blkcg_policy_enabled(blkg->disk, pol))
+ if (blkcg_policy_enabled(blkg->disk->queue, pol))
total += prfill(sf, blkg->pd[pol->plid], data);
spin_unlock_irq(&blkg->disk->queue->queue_lock);
}
@@ -728,7 +728,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
rcu_read_lock();
spin_lock_irq(&q->queue_lock);

- if (!blkcg_policy_enabled(disk, pol)) {
+ if (!blkcg_policy_enabled(q, pol)) {
ret = -EOPNOTSUPP;
goto fail_unlock;
}
@@ -771,7 +771,7 @@ int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
rcu_read_lock();
spin_lock_irq(&q->queue_lock);

- if (!blkcg_policy_enabled(disk, pol)) {
+ if (!blkcg_policy_enabled(q, pol)) {
blkg_free(new_blkg);
ret = -EOPNOTSUPP;
goto fail_preloaded;
@@ -951,7 +951,7 @@ static void blkcg_fill_root_iostats(void)
class_dev_iter_init(&iter, &block_class, NULL, &disk_type);
while ((dev = class_dev_iter_next(&iter))) {
struct block_device *bdev = dev_to_bdev(dev);
- struct blkcg_gq *blkg = bdev->bd_disk->root_blkg;
+ struct blkcg_gq *blkg = bdev->bd_disk->queue->root_blkg;
struct blkg_iostat tmp;
int cpu;
unsigned long flags;
@@ -1298,8 +1298,8 @@ int blkcg_init_disk(struct gendisk *disk)
bool preloaded;
int ret;

- INIT_LIST_HEAD(&disk->blkg_list);
- mutex_init(&disk->blkcg_mutex);
+ INIT_LIST_HEAD(&q->blkg_list);
+ mutex_init(&q->blkcg_mutex);

new_blkg = blkg_alloc(&blkcg_root, disk, GFP_KERNEL);
if (!new_blkg)
@@ -1313,7 +1313,7 @@ int blkcg_init_disk(struct gendisk *disk)
blkg = blkg_create(&blkcg_root, disk, new_blkg);
if (IS_ERR(blkg))
goto err_unlock;
- disk->root_blkg = blkg;
+ q->root_blkg = blkg;
spin_unlock_irq(&q->queue_lock);

if (preloaded)
@@ -1426,7 +1426,7 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
struct blkcg_gq *blkg, *pinned_blkg = NULL;
int ret;

- if (blkcg_policy_enabled(disk, pol))
+ if (blkcg_policy_enabled(q, pol))
return 0;

if (queue_is_mq(q))
@@ -1435,7 +1435,7 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
spin_lock_irq(&q->queue_lock);

/* blkg_list is pushed at the head, reverse walk to allocate parents first */
- list_for_each_entry_reverse(blkg, &disk->blkg_list, entry) {
+ list_for_each_entry_reverse(blkg, &q->blkg_list, q_node) {
struct blkg_policy_data *pd;

if (blkg->pd[pol->plid])
@@ -1480,16 +1480,16 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)

/* all allocated, init in the same order */
if (pol->pd_init_fn)
- list_for_each_entry_reverse(blkg, &disk->blkg_list, entry)
+ list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
pol->pd_init_fn(blkg->pd[pol->plid]);

- list_for_each_entry_reverse(blkg, &disk->blkg_list, entry) {
+ list_for_each_entry_reverse(blkg, &q->blkg_list, q_node) {
if (pol->pd_online_fn)
pol->pd_online_fn(blkg->pd[pol->plid]);
blkg->pd[pol->plid]->online = true;
}

- __set_bit(pol->plid, disk->blkcg_pols);
+ __set_bit(pol->plid, q->blkcg_pols);
ret = 0;

spin_unlock_irq(&q->queue_lock);
@@ -1505,7 +1505,7 @@ int blkcg_activate_policy(struct gendisk *disk, const struct blkcg_policy *pol)
enomem:
/* alloc failed, nothing's initialized yet, free everything */
spin_lock_irq(&q->queue_lock);
- list_for_each_entry(blkg, &disk->blkg_list, entry) {
+ list_for_each_entry(blkg, &q->blkg_list, q_node) {
struct blkcg *blkcg = blkg->blkcg;

spin_lock(&blkcg->lock);
@@ -1535,18 +1535,18 @@ void blkcg_deactivate_policy(struct gendisk *disk,
struct request_queue *q = disk->queue;
struct blkcg_gq *blkg;

- if (!blkcg_policy_enabled(disk, pol))
+ if (!blkcg_policy_enabled(q, pol))
return;

if (queue_is_mq(q))
blk_mq_freeze_queue(q);

- mutex_lock(&disk->blkcg_mutex);
+ mutex_lock(&q->blkcg_mutex);
spin_lock_irq(&q->queue_lock);

- __clear_bit(pol->plid, disk->blkcg_pols);
+ __clear_bit(pol->plid, q->blkcg_pols);

- list_for_each_entry(blkg, &disk->blkg_list, entry) {
+ list_for_each_entry(blkg, &q->blkg_list, q_node) {
struct blkcg *blkcg = blkg->blkcg;

spin_lock(&blkcg->lock);
@@ -1560,7 +1560,7 @@ void blkcg_deactivate_policy(struct gendisk *disk,
}

spin_unlock_irq(&q->queue_lock);
- mutex_unlock(&disk->blkcg_mutex);
+ mutex_unlock(&q->blkcg_mutex);

if (queue_is_mq(q))
blk_mq_unfreeze_queue(q);
@@ -1957,7 +1957,7 @@ static inline struct blkcg_gq *blkg_tryget_closest(struct bio *bio,
* Associate @bio with the blkg found by combining the css's blkg and the
* request_queue of the @bio. An association failure is handled by walking up
* the blkg tree. Therefore, the blkg associated can be anything between @blkg
- * and disk->root_blkg. This situation only happens when a cgroup is dying and
+ * and q->root_blkg. This situation only happens when a cgroup is dying and
* then the remaining bios will spill to the closest alive blkg.
*
* A reference will be taken on the blkg and will be released when @bio is
@@ -1972,8 +1972,8 @@ void bio_associate_blkg_from_css(struct bio *bio,
if (css && css->parent) {
bio->bi_blkg = blkg_tryget_closest(bio, css);
} else {
- blkg_get(bio->bi_bdev->bd_disk->root_blkg);
- bio->bi_blkg = bio->bi_bdev->bd_disk->root_blkg;
+ blkg_get(bdev_get_queue(bio->bi_bdev)->root_blkg);
+ bio->bi_blkg = bdev_get_queue(bio->bi_bdev)->root_blkg;
}
}
EXPORT_SYMBOL_GPL(bio_associate_blkg_from_css);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index e442b406ca0da6..151f24de253985 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -54,7 +54,7 @@ struct blkg_iostat_set {
/* association between a blk cgroup and a request queue */
struct blkcg_gq {
struct gendisk *disk;
- struct list_head entry;
+ struct list_head q_node;
struct hlist_node blkcg_node;
struct blkcg *blkcg;

@@ -250,7 +250,7 @@ static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg,
WARN_ON_ONCE(!rcu_read_lock_held());

if (blkcg == &blkcg_root)
- return disk->root_blkg;
+ return disk->queue->root_blkg;

blkg = rcu_dereference(blkcg->blkg_hint);
if (blkg && blkg->disk == disk)
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index 5d5aa1e526b742..bc0d217f5c1723 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -665,7 +665,7 @@ static void blkiolatency_timer_fn(struct timer_list *t)

rcu_read_lock();
blkg_for_each_descendant_pre(blkg, pos_css,
- blkiolat->rqos.disk->root_blkg) {
+ blkiolat->rqos.disk->queue->root_blkg) {
struct iolatency_grp *iolat;
struct child_latency_info *lat_info;
unsigned long flags;
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index e7bd7050d68402..21c8d5e871eac9 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -451,8 +451,7 @@ static void blk_throtl_update_limit_valid(struct throtl_data *td)
bool low_valid = false;

rcu_read_lock();
- blkg_for_each_descendant_post(blkg, pos_css,
- td->queue->disk->root_blkg) {
+ blkg_for_each_descendant_post(blkg, pos_css, td->queue->root_blkg) {
struct throtl_grp *tg = blkg_to_tg(blkg);

if (tg->bps[READ][LIMIT_LOW] || tg->bps[WRITE][LIMIT_LOW] ||
@@ -1181,7 +1180,7 @@ static void throtl_pending_timer_fn(struct timer_list *t)

spin_lock_irq(&q->queue_lock);

- if (!q->disk->root_blkg)
+ if (!q->root_blkg)
goto out_unlock;

if (throtl_can_upgrade(td, NULL))
@@ -1323,8 +1322,7 @@ static void tg_conf_updated(struct throtl_grp *tg, bool global)
* blk-throttle.
*/
blkg_for_each_descendant_pre(blkg, pos_css,
- global ? tg->td->queue->disk->root_blkg :
- tg_to_blkg(tg)) {
+ global ? tg->td->queue->root_blkg : tg_to_blkg(tg)) {
struct throtl_grp *this_tg = blkg_to_tg(blkg);
struct throtl_grp *parent_tg;

@@ -1719,7 +1717,7 @@ void blk_throtl_cancel_bios(struct gendisk *disk)
* path need RCU protection and to prevent warning from lockdep.
*/
rcu_read_lock();
- blkg_for_each_descendant_post(blkg, pos_css, disk->root_blkg) {
+ blkg_for_each_descendant_post(blkg, pos_css, q->root_blkg) {
struct throtl_grp *tg = blkg_to_tg(blkg);
struct throtl_service_queue *sq = &tg->service_queue;

@@ -1873,8 +1871,7 @@ static bool throtl_can_upgrade(struct throtl_data *td,
return false;

rcu_read_lock();
- blkg_for_each_descendant_post(blkg, pos_css,
- td->queue->disk->root_blkg) {
+ blkg_for_each_descendant_post(blkg, pos_css, td->queue->root_blkg) {
struct throtl_grp *tg = blkg_to_tg(blkg);

if (tg == this_tg)
@@ -1920,8 +1917,7 @@ static void throtl_upgrade_state(struct throtl_data *td)
td->low_upgrade_time = jiffies;
td->scale = 0;
rcu_read_lock();
- blkg_for_each_descendant_post(blkg, pos_css,
- td->queue->disk->root_blkg) {
+ blkg_for_each_descendant_post(blkg, pos_css, td->queue->root_blkg) {
struct throtl_grp *tg = blkg_to_tg(blkg);
struct throtl_service_queue *sq = &tg->service_queue;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 79aec4ebadb9e0..b9637d63e6f024 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -163,12 +163,6 @@ struct gendisk {
struct timer_rand_state *random;
atomic_t sync_io; /* RAID */
struct disk_events *ev;
-#ifdef CONFIG_BLK_CGROUP
- DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
- struct blkcg_gq *root_blkg;
- struct list_head blkg_list;
- struct mutex blkcg_mutex;
-#endif /* CONFIG_BLK_CGROUP */
#ifdef CONFIG_BLK_DEV_INTEGRITY
struct kobject integrity_kobj;
#endif /* CONFIG_BLK_DEV_INTEGRITY */
@@ -487,6 +481,12 @@ struct request_queue {
struct blk_mq_tags *sched_shared_tags;

struct list_head icq_list;
+#ifdef CONFIG_BLK_CGROUP
+ DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
+ struct blkcg_gq *root_blkg;
+ struct list_head blkg_list;
+ struct mutex blkcg_mutex;
+#endif

struct queue_limits limits;

--
2.39.1