diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-throttle.c | 36 | ||||
| -rw-r--r-- | block/blk-throttle.h | 3 | ||||
| -rw-r--r-- | block/genhd.c | 3 |
3 files changed, 41 insertions, 1 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 880701d0106f..469c483719be 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -874,7 +874,8 @@ static bool tg_may_dispatch(struct throtl_grp *tg, struct bio *bio, bio != throtl_peek_queued(&tg->service_queue.queued[rw])); /* If tg->bps = -1, then BW is unlimited */ - if (bps_limit == U64_MAX && iops_limit == UINT_MAX) { + if ((bps_limit == U64_MAX && iops_limit == UINT_MAX) || + tg->flags & THROTL_TG_CANCELING) { if (wait) *wait = 0; return true; @@ -1776,6 +1777,39 @@ static bool throtl_hierarchy_can_upgrade(struct throtl_grp *tg) return false; } +void blk_throtl_cancel_bios(struct request_queue *q) +{ + struct cgroup_subsys_state *pos_css; + struct blkcg_gq *blkg; + + spin_lock_irq(&q->queue_lock); + /* + * queue_lock is held, rcu lock is not needed here technically. + * However, rcu lock is still held to emphasize that following + * path need RCU protection and to prevent warning from lockdep. + */ + rcu_read_lock(); + 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; + + /* + * Set the flag to make sure throtl_pending_timer_fn() won't + * stop until all throttled bios are dispatched. + */ + blkg_to_tg(blkg)->flags |= THROTL_TG_CANCELING; + /* + * Update disptime after setting the above flag to make sure + * throtl_select_dispatch() won't exit without dispatching. + */ + tg_update_disptime(tg); + + throtl_schedule_pending_timer(sq, jiffies + 1); + } + rcu_read_unlock(); + spin_unlock_irq(&q->queue_lock); +} + static bool throtl_can_upgrade(struct throtl_data *td, struct throtl_grp *this_tg) { diff --git a/block/blk-throttle.h b/block/blk-throttle.h index b23a9f3abb82..c1b602996127 100644 --- a/block/blk-throttle.h +++ b/block/blk-throttle.h @@ -56,6 +56,7 @@ enum tg_state_flags { THROTL_TG_PENDING = 1 << 0, /* on parent's pending tree */ THROTL_TG_WAS_EMPTY = 1 << 1, /* bio_lists[] became non-empty */ THROTL_TG_HAS_IOPS_LIMIT = 1 << 2, /* tg has iops limit */ + THROTL_TG_CANCELING = 1 << 3, /* starts to cancel bio */ }; enum { @@ -162,11 +163,13 @@ static inline int blk_throtl_init(struct request_queue *q) { return 0; } static inline void blk_throtl_exit(struct request_queue *q) { } static inline void blk_throtl_register_queue(struct request_queue *q) { } static inline bool blk_throtl_bio(struct bio *bio) { return false; } +static inline void blk_throtl_cancel_bios(struct request_queue *q) { } #else /* CONFIG_BLK_DEV_THROTTLING */ int blk_throtl_init(struct request_queue *q); void blk_throtl_exit(struct request_queue *q); void blk_throtl_register_queue(struct request_queue *q); bool __blk_throtl_bio(struct bio *bio); +void blk_throtl_cancel_bios(struct request_queue *q); static inline bool blk_throtl_bio(struct bio *bio) { struct throtl_grp *tg = blkg_to_tg(bio->bi_blkg); diff --git a/block/genhd.c b/block/genhd.c index 56f66c6fee94..8244f09e058d 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -25,6 +25,7 @@ #include <linux/pm_runtime.h> #include <linux/badblocks.h> #include <linux/part_stat.h> +#include "blk-throttle.h" #include "blk.h" #include "blk-mq-sched.h" @@ -627,6 +628,8 @@ void del_gendisk(struct gendisk *disk) blk_mq_freeze_queue_wait(q); + blk_throtl_cancel_bios(disk->queue); + blk_sync_queue(q); blk_flush_integrity(); /* |