diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 3 | ||||
| -rw-r--r-- | block/blk-exec.c | 7 | ||||
| -rw-r--r-- | block/blk-ioc.c | 4 | ||||
| -rw-r--r-- | block/blk-throttle.c | 4 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 33 | ||||
| -rw-r--r-- | block/genhd.c | 89 |
6 files changed, 79 insertions, 61 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index d2f8f4049abd..1d49e1c7c905 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -839,6 +839,9 @@ struct request *blk_get_request(struct request_queue *q, int rw, gfp_t gfp_mask) { struct request *rq; + if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) + return NULL; + BUG_ON(rw != READ && rw != WRITE); spin_lock_irq(q->queue_lock); diff --git a/block/blk-exec.c b/block/blk-exec.c index 8a0e7ec056e7..a1ebceb332f9 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -50,6 +50,13 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, { int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK; + if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) { + rq->errors = -ENXIO; + if (rq->end_io) + rq->end_io(rq, rq->errors); + return; + } + rq->rq_disk = bd_disk; rq->end_io = done; WARN_ON(irqs_disabled()); diff --git a/block/blk-ioc.c b/block/blk-ioc.c index c898049dafd5..342eae9b0d3c 100644 --- a/block/blk-ioc.c +++ b/block/blk-ioc.c @@ -21,7 +21,7 @@ static void cfq_dtor(struct io_context *ioc) if (!hlist_empty(&ioc->cic_list)) { struct cfq_io_context *cic; - cic = list_entry(ioc->cic_list.first, struct cfq_io_context, + cic = hlist_entry(ioc->cic_list.first, struct cfq_io_context, cic_list); cic->dtor(ioc); } @@ -57,7 +57,7 @@ static void cfq_exit(struct io_context *ioc) if (!hlist_empty(&ioc->cic_list)) { struct cfq_io_context *cic; - cic = list_entry(ioc->cic_list.first, struct cfq_io_context, + cic = hlist_entry(ioc->cic_list.first, struct cfq_io_context, cic_list); cic->exit(ioc); } diff --git a/block/blk-throttle.c b/block/blk-throttle.c index a62be8d0dc1b..3689f833afdc 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -927,7 +927,7 @@ static int throtl_dispatch(struct request_queue *q) bio_list_init(&bio_list_on_stack); - throtl_log(td, "dispatch nr_queued=%lu read=%u write=%u", + throtl_log(td, "dispatch nr_queued=%d read=%u write=%u", total_nr_queued(td), td->nr_queued[READ], td->nr_queued[WRITE]); @@ -1204,7 +1204,7 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop) } queue_bio: - throtl_log_tg(td, tg, "[%c] bio. bdisp=%u sz=%u bps=%llu" + throtl_log_tg(td, tg, "[%c] bio. bdisp=%llu sz=%u bps=%llu" " iodisp=%u iops=%u queued=%d/%d", rw == READ ? 'R' : 'W', tg->bytes_disp[rw], bio->bi_size, tg->bps[rw], diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 7c52d6888924..ae21919f15e1 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -185,7 +185,7 @@ struct cfq_group { int nr_cfqq; /* - * Per group busy queus average. Useful for workload slice calc. We + * Per group busy queues average. Useful for workload slice calc. We * create the array for each prio class but at run time it is used * only for RT and BE class and slot for IDLE class remains unused. * This is primarily done to avoid confusion and a gcc warning. @@ -369,16 +369,16 @@ 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(&(cfqq)->cfqg->blkg), ##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)->blkg), ##args) \ #else #define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args) -#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0); +#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0) #endif #define cfq_log(cfqd, fmt, args...) \ blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args) @@ -988,9 +988,10 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime, st->min_vdisktime); - cfq_log_cfqq(cfqq->cfqd, cfqq, "sl_used=%u disp=%u charge=%u iops=%u" - " sect=%u", used_sl, cfqq->slice_dispatch, charge, - iops_mode(cfqd), cfqq->nr_sectors); + cfq_log_cfqq(cfqq->cfqd, cfqq, + "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, unaccounted_sl); cfq_blkiocg_set_start_empty_time(&cfqg->blkg); @@ -2023,8 +2024,8 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) */ if (sample_valid(cic->ttime_samples) && (cfqq->slice_end - jiffies < cic->ttime_mean)) { - cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%d", - cic->ttime_mean); + cfq_log_cfqq(cfqd, cfqq, "Not idling. think_time:%lu", + cic->ttime_mean); return; } @@ -2772,8 +2773,14 @@ static void __cfq_exit_single_io_context(struct cfq_data *cfqd, smp_wmb(); cic->key = cfqd_dead_key(cfqd); - if (ioc->ioc_data == cic) + rcu_read_lock(); + if (rcu_dereference(ioc->ioc_data) == cic) { + rcu_read_unlock(); + spin_lock(&ioc->lock); rcu_assign_pointer(ioc->ioc_data, NULL); + spin_unlock(&ioc->lock); + } else + rcu_read_unlock(); if (cic->cfqq[BLK_RW_ASYNC]) { cfq_exit_cfqq(cfqd, cic->cfqq[BLK_RW_ASYNC]); @@ -3080,7 +3087,8 @@ cfq_drop_dead_cic(struct cfq_data *cfqd, struct io_context *ioc, spin_lock_irqsave(&ioc->lock, flags); - BUG_ON(ioc->ioc_data == cic); + BUG_ON(rcu_dereference_check(ioc->ioc_data, + lockdep_is_held(&ioc->lock)) == cic); radix_tree_delete(&ioc->radix_root, cfqd->cic_index); hlist_del_rcu(&cic->cic_list); @@ -3786,9 +3794,6 @@ new_queue: return 0; queue_fail: - if (cic) - put_io_context(cic->ioc); - cfq_schedule_dispatch(cfqd); spin_unlock_irqrestore(q->queue_lock, flags); cfq_log(cfqd, "set_request fail"); diff --git a/block/genhd.c b/block/genhd.c index 95822ae25cfe..6024b82e3209 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1018,14 +1018,6 @@ static const struct attribute_group *disk_attr_groups[] = { NULL }; -static void disk_free_ptbl_rcu_cb(struct rcu_head *head) -{ - struct disk_part_tbl *ptbl = - container_of(head, struct disk_part_tbl, rcu_head); - - kfree(ptbl); -} - /** * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way * @disk: disk to replace part_tbl for @@ -1046,7 +1038,7 @@ static void disk_replace_part_tbl(struct gendisk *disk, if (old_ptbl) { rcu_assign_pointer(old_ptbl->last_lookup, NULL); - call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); + kfree_rcu(old_ptbl, rcu_head); } } @@ -1371,6 +1363,7 @@ struct disk_events { struct gendisk *disk; /* the associated disk */ spinlock_t lock; + struct mutex block_mutex; /* protects blocking */ int block; /* event blocking depth */ unsigned int pending; /* events already sent out */ unsigned int clearing; /* events being cleared */ @@ -1414,22 +1407,44 @@ static unsigned long disk_events_poll_jiffies(struct gendisk *disk) return msecs_to_jiffies(intv_msecs); } -static void __disk_block_events(struct gendisk *disk, bool sync) +/** + * disk_block_events - block and flush disk event checking + * @disk: disk to block events for + * + * On return from this function, it is guaranteed that event checking + * isn't in progress and won't happen until unblocked by + * disk_unblock_events(). Events blocking is counted and the actual + * unblocking happens after the matching number of unblocks are done. + * + * Note that this intentionally does not block event checking from + * disk_clear_events(). + * + * CONTEXT: + * Might sleep. + */ +void disk_block_events(struct gendisk *disk) { struct disk_events *ev = disk->ev; unsigned long flags; bool cancel; + if (!ev) + return; + + /* + * Outer mutex ensures that the first blocker completes canceling + * the event work before further blockers are allowed to finish. + */ + mutex_lock(&ev->block_mutex); + spin_lock_irqsave(&ev->lock, flags); cancel = !ev->block++; spin_unlock_irqrestore(&ev->lock, flags); - if (cancel) { - if (sync) - cancel_delayed_work_sync(&disk->ev->dwork); - else - cancel_delayed_work(&disk->ev->dwork); - } + if (cancel) + cancel_delayed_work_sync(&disk->ev->dwork); + + mutex_unlock(&ev->block_mutex); } static void __disk_unblock_events(struct gendisk *disk, bool check_now) @@ -1461,27 +1476,6 @@ out_unlock: } /** - * disk_block_events - block and flush disk event checking - * @disk: disk to block events for - * - * On return from this function, it is guaranteed that event checking - * isn't in progress and won't happen until unblocked by - * disk_unblock_events(). Events blocking is counted and the actual - * unblocking happens after the matching number of unblocks are done. - * - * Note that this intentionally does not block event checking from - * disk_clear_events(). - * - * CONTEXT: - * Might sleep. - */ -void disk_block_events(struct gendisk *disk) -{ - if (disk->ev) - __disk_block_events(disk, true); -} - -/** * disk_unblock_events - unblock disk event checking * @disk: disk to unblock events for * @@ -1508,10 +1502,18 @@ void disk_unblock_events(struct gendisk *disk) */ void disk_check_events(struct gendisk *disk) { - if (disk->ev) { - __disk_block_events(disk, false); - __disk_unblock_events(disk, true); + struct disk_events *ev = disk->ev; + unsigned long flags; + + if (!ev) + return; + + spin_lock_irqsave(&ev->lock, flags); + if (!ev->block) { + cancel_delayed_work(&ev->dwork); + queue_delayed_work(system_nrt_wq, &ev->dwork, 0); } + spin_unlock_irqrestore(&ev->lock, flags); } EXPORT_SYMBOL_GPL(disk_check_events); @@ -1546,7 +1548,7 @@ unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask) spin_unlock_irq(&ev->lock); /* uncondtionally schedule event check and wait for it to finish */ - __disk_block_events(disk, true); + disk_block_events(disk); queue_delayed_work(system_nrt_wq, &ev->dwork, 0); flush_delayed_work(&ev->dwork); __disk_unblock_events(disk, false); @@ -1664,7 +1666,7 @@ static ssize_t disk_events_poll_msecs_store(struct device *dev, if (intv < 0 && intv != -1) return -EINVAL; - __disk_block_events(disk, true); + disk_block_events(disk); disk->ev->poll_msecs = intv; __disk_unblock_events(disk, true); @@ -1750,6 +1752,7 @@ static void disk_add_events(struct gendisk *disk) INIT_LIST_HEAD(&ev->node); ev->disk = disk; spin_lock_init(&ev->lock); + mutex_init(&ev->block_mutex); ev->block = 1; ev->poll_msecs = -1; INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); @@ -1770,7 +1773,7 @@ static void disk_del_events(struct gendisk *disk) if (!disk->ev) return; - __disk_block_events(disk, true); + disk_block_events(disk); mutex_lock(&disk_events_mutex); list_del_init(&disk->ev->node); |