diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-cgroup.h | 2 | ||||
| -rw-r--r-- | block/blk-core.c | 42 | ||||
| -rw-r--r-- | block/blk-exec.c | 2 | ||||
| -rw-r--r-- | block/blk-flush.c | 18 | ||||
| -rw-r--r-- | block/blk-lib.c | 2 | ||||
| -rw-r--r-- | block/blk-settings.c | 7 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 2 | ||||
| -rw-r--r-- | block/blk-throttle.c | 131 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 41 | ||||
| -rw-r--r-- | block/elevator.c | 4 | ||||
| -rw-r--r-- | block/genhd.c | 4 | ||||
| -rw-r--r-- | block/ioctl.c | 8 |
12 files changed, 144 insertions, 119 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index ea4861b..57e7234 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -240,7 +240,7 @@ static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } #endif -#define BLKIO_WEIGHT_MIN 100 +#define BLKIO_WEIGHT_MIN 10 #define BLKIO_WEIGHT_MAX 1000 #define BLKIO_WEIGHT_DEFAULT 500 diff --git a/block/blk-core.c b/block/blk-core.c index 7e9715a..e1fcf7a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -217,7 +217,7 @@ static void blk_delay_work(struct work_struct *work) q = container_of(work, struct request_queue, delay_work.work); spin_lock_irq(q->queue_lock); - __blk_run_queue(q); + __blk_run_queue(q, false); spin_unlock_irq(q->queue_lock); } @@ -251,7 +251,7 @@ void blk_start_queue(struct request_queue *q) WARN_ON(!irqs_disabled()); queue_flag_clear(QUEUE_FLAG_STOPPED, q); - __blk_run_queue(q); + __blk_run_queue(q, false); } EXPORT_SYMBOL(blk_start_queue); @@ -289,11 +289,14 @@ EXPORT_SYMBOL(blk_stop_queue); * that its ->make_request_fn will not re-add plugging prior to calling * this function. * + * This function does not cancel any asynchronous activity arising + * out of elevator or throttling code. That would require elevaotor_exit() + * and blk_throtl_exit() to be called with queue lock initialized. + * */ void blk_sync_queue(struct request_queue *q) { del_timer_sync(&q->timeout); - throtl_shutdown_timer_wq(q); cancel_delayed_work_sync(&q->delay_work); queue_sync_plugs(q); } @@ -302,13 +305,14 @@ EXPORT_SYMBOL(blk_sync_queue); /** * __blk_run_queue - run a single device queue * @q: The queue to run + * @force_kblockd: Don't run @q->request_fn directly. Use kblockd. * * Description: * See @blk_run_queue. This variant must be called with the queue lock * held and interrupts disabled. * */ -void __blk_run_queue(struct request_queue *q) +void __blk_run_queue(struct request_queue *q, bool force_kblockd) { if (unlikely(blk_queue_stopped(q))) return; @@ -317,7 +321,7 @@ void __blk_run_queue(struct request_queue *q) * Only recurse once to avoid overrunning the stack, let the unplug * handling reinvoke the handler shortly if we already got there. */ - if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) { + if (!force_kblockd && !queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) { q->request_fn(q); queue_flag_clear(QUEUE_FLAG_REENTER, q); } else @@ -338,7 +342,7 @@ void blk_run_queue(struct request_queue *q) unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); - __blk_run_queue(q); + __blk_run_queue(q, false); spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_run_queue); @@ -348,6 +352,11 @@ void blk_put_queue(struct request_queue *q) kobject_put(&q->kobj); } +/* + * Note: If a driver supplied the queue lock, it should not zap that lock + * unexpectedly as some queue cleanup components like elevator_exit() and + * blk_throtl_exit() need queue lock. + */ void blk_cleanup_queue(struct request_queue *q) { /* @@ -366,6 +375,8 @@ void blk_cleanup_queue(struct request_queue *q) if (q->elevator) elevator_exit(q->elevator); + blk_throtl_exit(q); + blk_put_queue(q); } EXPORT_SYMBOL(blk_cleanup_queue); @@ -439,6 +450,12 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) mutex_init(&q->sysfs_lock); spin_lock_init(&q->__queue_lock); + /* + * By default initialize queue_lock to internal lock and driver can + * override it later if need be. + */ + q->queue_lock = &q->__queue_lock; + return q; } EXPORT_SYMBOL(blk_alloc_queue_node); @@ -522,7 +539,10 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn, q->prep_rq_fn = NULL; q->unprep_rq_fn = NULL; q->queue_flags = QUEUE_FLAG_DEFAULT; - q->queue_lock = lock; + + /* Override internal queue lock with supplied lock pointer */ + if (lock) + q->queue_lock = lock; /* * This also sets hw/phys segments, boundary and size @@ -971,7 +991,7 @@ void blk_insert_request(struct request_queue *q, struct request *rq, blk_queue_end_tag(q, rq); add_acct_request(q, rq, where); - __blk_run_queue(q); + __blk_run_queue(q, false); spin_unlock_irqrestore(q->queue_lock, flags); } EXPORT_SYMBOL(blk_insert_request); @@ -1307,7 +1327,7 @@ get_rq: } else { spin_lock_irq(q->queue_lock); add_acct_request(q, req, where); - __blk_run_queue(q); + __blk_run_queue(q, false); out_unlock: spin_unlock_irq(q->queue_lock); } @@ -2654,7 +2674,7 @@ static void flush_plug_list(struct blk_plug *plug) BUG_ON(!rq->q); if (rq->q != q) { if (q) { - __blk_run_queue(q); + __blk_run_queue(q, false); spin_unlock(q->queue_lock); } q = rq->q; @@ -2669,7 +2689,7 @@ static void flush_plug_list(struct blk_plug *plug) } if (q) { - __blk_run_queue(q); + __blk_run_queue(q, false); spin_unlock(q->queue_lock); } diff --git a/block/blk-exec.c b/block/blk-exec.c index 81e3181..7482b7f 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -55,7 +55,7 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk, WARN_ON(irqs_disabled()); spin_lock_irq(q->queue_lock); __elv_add_request(q, rq, where); - __blk_run_queue(q); + __blk_run_queue(q, false); /* the queue is stopped so it won't be plugged+unplugged */ if (rq->cmd_type == REQ_TYPE_PM_RESUME) q->request_fn(q); diff --git a/block/blk-flush.c b/block/blk-flush.c index 671fa9d..93d5fd8 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -211,9 +211,14 @@ static void flush_end_io(struct request *flush_rq, int error) queued |= blk_flush_complete_seq(rq, seq, error); } - /* after populating an empty queue, kick it to avoid stall */ + /* + * Moving a request silently to empty queue_head may stall the + * queue. Kick the queue in those cases. This function is called + * from request completion path and calling directly into + * request_fn may confuse the driver. Always use kblockd. + */ if (queued) - __blk_run_queue(q); + __blk_run_queue(q, true); } /** @@ -256,7 +261,7 @@ static bool blk_kick_flush(struct request_queue *q) q->flush_rq.end_io = flush_end_io; q->flush_pending_idx ^= 1; - elv_insert(q, &q->flush_rq, ELEVATOR_INSERT_FRONT); + elv_insert(q, &q->flush_rq, ELEVATOR_INSERT_REQUEUE); return true; } @@ -264,9 +269,12 @@ static void flush_data_end_io(struct request *rq, int error) { struct request_queue *q = rq->q; - /* after populating an empty queue, kick it to avoid stall */ + /* + * After populating an empty queue, kick it to avoid stall. Read + * the comment in flush_end_io(). + */ if (blk_flush_complete_seq(rq, REQ_FSEQ_DATA, error)) - __blk_run_queue(q); + __blk_run_queue(q, true); } /** diff --git a/block/blk-lib.c b/block/blk-lib.c index 1a320d2..eec78be 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -132,7 +132,7 @@ static void bio_batch_end_io(struct bio *bio, int err) } /** - * blkdev_issue_zeroout generate number of zero filed write bios + * blkdev_issue_zeroout - generate number of zero filed write bios * @bdev: blockdev to issue * @sector: start sector * @nr_sects: number of sectors to write diff --git a/block/blk-settings.c b/block/blk-settings.c index c8d6892..1fa7692 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -168,13 +168,6 @@ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) blk_queue_max_hw_sectors(q, BLK_SAFE_MAX_SECTORS); /* - * If the caller didn't supply a lock, fall back to our embedded - * per-queue locks - */ - if (!q->queue_lock) - q->queue_lock = &q->__queue_lock; - - /* * by default assume old behaviour and bounce for any highmem page */ blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 41fb691..261c75c 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -471,8 +471,6 @@ static void blk_release_queue(struct kobject *kobj) blk_sync_queue(q); - blk_throtl_exit(q); - if (rl->rq_pool) mempool_destroy(rl->rq_pool); diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 658ee50..37abbfc 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -20,6 +20,11 @@ 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 */ +/* A workqueue to queue throttle related work */ +static struct workqueue_struct *kthrotld_workqueue; +static void throtl_schedule_delayed_work(struct throtl_data *td, + unsigned long delay); + struct throtl_rb_root { struct rb_root rb; struct rb_node *left; @@ -97,7 +102,7 @@ struct throtl_data /* Work for dispatching throttled bios */ struct delayed_work throtl_work; - atomic_t limits_changed; + bool limits_changed; }; enum tg_state_flags { @@ -196,6 +201,7 @@ static struct throtl_grp * throtl_find_alloc_tg(struct throtl_data *td, RB_CLEAR_NODE(&tg->rb_node); bio_list_init(&tg->bio_lists[0]); bio_list_init(&tg->bio_lists[1]); + td->limits_changed = false; /* * Take the initial reference that will be released on destroy @@ -345,10 +351,9 @@ static void throtl_schedule_next_dispatch(struct throtl_data *td) update_min_dispatch_time(st); if (time_before_eq(st->min_disptime, jiffies)) - throtl_schedule_delayed_work(td->queue, 0); + throtl_schedule_delayed_work(td, 0); else - throtl_schedule_delayed_work(td->queue, - (st->min_disptime - jiffies)); + throtl_schedule_delayed_work(td, (st->min_disptime - jiffies)); } static inline void @@ -733,34 +738,27 @@ static void throtl_process_limit_change(struct throtl_data *td) struct throtl_grp *tg; struct hlist_node *pos, *n; - if (!atomic_read(&td->limits_changed)) + if (!td->limits_changed) return; - throtl_log(td, "limit changed =%d", atomic_read(&td->limits_changed)); + xchg(&td->limits_changed, false); - /* - * Make sure updates from throtl_update_blkio_group_read_bps() group - * of functions to tg->limits_changed are visible. We do not - * want update td->limits_changed to be visible but update to - * tg->limits_changed not being visible yet on this cpu. Hence - * the read barrier. - */ - smp_rmb(); + throtl_log(td, "limits changed"); hlist_for_each_entry_safe(tg, pos, n, &td->tg_list, tg_node) { - if (throtl_tg_on_rr(tg) && tg->limits_changed) { - throtl_log_tg(td, tg, "limit change rbps=%llu wbps=%llu" - " riops=%u wiops=%u", tg->bps[READ], - tg->bps[WRITE], tg->iops[READ], - tg->iops[WRITE]); + if (!tg->limits_changed) + continue; + + if (!xchg(&tg->limits_changed, false)) + continue; + + throtl_log_tg(td, tg, "limit change rbps=%llu wbps=%llu" + " riops=%u wiops=%u", tg->bps[READ], tg->bps[WRITE], + tg->iops[READ], tg->iops[WRITE]); + + if (throtl_tg_on_rr(tg)) tg_update_disptime(td, tg); - tg->limits_changed = false; - } } - - smp_mb__before_atomic_dec(); - atomic_dec(&td->limits_changed); - smp_mb__after_atomic_dec(); } /* Dispatch throttled bios. Should be called without queue lock held. */ @@ -817,10 +815,10 @@ void blk_throtl_work(struct work_struct *work) } /* Call with queue lock held */ -void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay) +static void +throtl_schedule_delayed_work(struct throtl_data *td, unsigned long delay) { - struct throtl_data *td = q->td; struct delayed_work *dwork = &td->throtl_work; if (total_nr_queued(td) > 0) { @@ -829,12 +827,11 @@ void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay) * Cancel that and schedule a new one. */ __cancel_delayed_work(dwork); - kblockd_schedule_delayed_work(q, dwork, delay); + queue_delayed_work(kthrotld_workqueue, dwork, delay); throtl_log(td, "schedule work. delay=%lu jiffies=%lu", delay, jiffies); } } -EXPORT_SYMBOL(throtl_schedule_delayed_work); static void throtl_destroy_tg(struct throtl_data *td, struct throtl_grp *tg) @@ -897,6 +894,15 @@ void throtl_unlink_blkio_group(void *key, struct blkio_group *blkg) spin_unlock_irqrestore(td->queue->queue_lock, flags); } +static void throtl_update_blkio_group_common(struct throtl_data *td, + struct throtl_grp *tg) +{ + xchg(&tg->limits_changed, true); + xchg(&td->limits_changed, true); + /* Schedule a work now to process the limit change */ + throtl_schedule_delayed_work(td, 0); +} + /* * For all update functions, key should be a valid pointer because these * update functions are called under blkcg_lock, that means, blkg is @@ -910,64 +916,43 @@ static void throtl_update_blkio_group_read_bps(void *key, struct blkio_group *blkg, u64 read_bps) { struct throtl_data *td = key; + struct throtl_grp *tg = tg_of_blkg(blkg); - tg_of_blkg(blkg)->bps[READ] = read_bps; - /* Make sure read_bps is updated before setting limits_changed */ - smp_wmb(); - tg_of_blkg(blkg)->limits_changed = true; - - /* Make sure tg->limits_changed is updated before td->limits_changed */ - smp_mb__before_atomic_inc(); - atomic_inc(&td->limits_changed); - smp_mb__after_atomic_inc(); - - /* Schedule a work now to process the limit change */ - throtl_schedule_delayed_work(td->queue, 0); + tg->bps[READ] = read_bps; + throtl_update_blkio_group_common(td, tg); } static void throtl_update_blkio_group_write_bps(void *key, struct blkio_group *blkg, u64 write_bps) { struct throtl_data *td = key; + struct throtl_grp *tg = tg_of_blkg(blkg); - tg_of_blkg(blkg)->bps[WRITE] = write_bps; - smp_wmb(); - tg_of_blkg(blkg)->limits_changed = true; - smp_mb__before_atomic_inc(); - atomic_inc(&td->limits_changed); - smp_mb__after_atomic_inc(); - throtl_schedule_delayed_work(td->queue, 0); + tg->bps[WRITE] = write_bps; + throtl_update_blkio_group_common(td, tg); } static void throtl_update_blkio_group_read_iops(void *key, struct blkio_group *blkg, unsigned int read_iops) { struct throtl_data *td = key; + struct throtl_grp *tg = tg_of_blkg(blkg); - tg_of_blkg(blkg)->iops[READ] = read_iops; - smp_wmb(); - tg_of_blkg(blkg)->limits_changed = true; - smp_mb__before_atomic_inc(); - atomic_inc(&td->limits_changed); - smp_mb__after_atomic_inc(); - throtl_schedule_delayed_work(td->queue, 0); + tg->iops[READ] = read_iops; + throtl_update_blkio_group_common(td, tg); } static void throtl_update_blkio_group_write_iops(void *key, struct blkio_group *blkg, unsigned int write_iops) { struct throtl_data *td = key; + struct throtl_grp *tg = tg_of_blkg(blkg); - tg_of_blkg(blkg)->iops[WRITE] = write_iops; - smp_wmb(); - tg_of_blkg(blkg)->limits_changed = true; - smp_mb__before_atomic_inc(); - atomic_inc(&td->limits_changed); - smp_mb__after_atomic_inc(); - throtl_schedule_delayed_work(td->queue, 0); + tg->iops[WRITE] = write_iops; + throtl_update_blkio_group_common(td, tg); } -void throtl_shutdown_timer_wq(struct request_queue *q) +static void throtl_shutdown_wq(struct request_queue *q) { struct throtl_data *td = q->td; @@ -1008,15 +993,10 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop) /* * There is already another bio queued in same dir. No * need to update dispatch time. - * Still update the disptime if rate limits on this group - * were changed. */ - if (!tg->limits_changed) - update_disptime = false; - else - tg->limits_changed = false; - + update_disptime = false; goto queue_bio; + } /* Bio is with-in rate limit of group */ @@ -1057,7 +1037,7 @@ int blk_throtl_init(struct request_queue *q) INIT_HLIST_HEAD(&td->tg_list); td->tg_service_tree = THROTL_RB_ROOT; - atomic_set(&td->limits_changed, 0); + td->limits_changed = false; /* Init root group */ tg = &td->root_tg; @@ -1069,6 +1049,7 @@ int blk_throtl_init(struct request_queue *q) /* Practically unlimited BW */ tg->bps[0] = tg->bps[1] = -1; tg->iops[0] = tg->iops[1] = -1; + td->limits_changed = false; /* * Set root group reference to 2. One reference will be dropped when @@ -1101,7 +1082,7 @@ void blk_throtl_exit(struct request_queue *q) BUG_ON(!td); - throtl_shutdown_timer_wq(q); + throtl_shutdown_wq(q); spin_lock_irq(q->queue_lock); throtl_release_tgs(td); @@ -1131,12 +1112,16 @@ void blk_throtl_exit(struct request_queue *q) * update limits through cgroup and another work got queued, cancel * it. */ - throtl_shutdown_timer_wq(q); + throtl_shutdown_wq(q); throtl_td_free(td); } static int __init throtl_init(void) { + kthrotld_workqueue = alloc_workqueue("kthrotld", WQ_MEM_RECLAIM, 0); + if (!kthrotld_workqueue) + panic("Failed to create kthrotld\n"); + blkio_policy_register(&blkio_policy_throtl); return 0; } diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index ef63153..c826ef8 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -237,6 +237,7 @@ struct cfq_data { struct rb_root prio_trees[CFQ_PRIO_LISTS]; unsigned int busy_queues; + unsigned int busy_sync_queues; int rq_in_driver; int rq_in_flight[2]; @@ -549,15 +550,13 @@ static inline u64 min_vdisktime(u64 min_vdisktime, u64 vdisktime) static void update_min_vdisktime(struct cfq_rb_root *st) { - u64 vdisktime = st->min_vdisktime; struct cfq_group *cfqg; if (st->left) { cfqg = rb_entry_cfqg(st->left); - vdisktime = min_vdisktime(vdisktime, cfqg->vdisktime); + st->min_vdisktime = max_vdisktime(st->min_vdisktime, + cfqg->vdisktime); } - - st->min_vdisktime = max_vdisktime(st->min_vdisktime, vdisktime); } /* @@ -1337,6 +1336,8 @@ static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) BUG_ON(cfq_cfqq_on_rr(cfqq)); cfq_mark_cfqq_on_rr(cfqq); cfqd->busy_queues++; + if (cfq_cfqq_sync(cfqq)) + cfqd->busy_sync_queues++; cfq_resort_rr_list(cfqd, cfqq); } @@ -1363,6 +1364,8 @@ static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq) cfq_group_service_tree_del(cfqd, cfqq->cfqg); BUG_ON(!cfqd->busy_queues); cfqd->busy_queues--; + if (cfq_cfqq_sync(cfqq)) + cfqd->busy_sync_queues--; } /* @@ -2370,6 +2373,7 @@ static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) * Does this cfqq already have too much IO in flight? */ if (cfqq->dispatched >= max_dispatch) { + bool promote_sync = false; /* * idle queue must always only have a single IO in flight */ @@ -2377,15 +2381,31 @@ static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq) return false; /* + * If there is only one sync queue, and its think time is + * small, we can ignore async queue here and give the sync + * queue no dispatch limit. The reason is a sync queue can + * preempt async queue, limiting the sync queue doesn't make + * sense. This is useful for aiostress test. + */ + if (cfq_cfqq_sync(cfqq) && cfqd->busy_sync_queues == 1) { + struct cfq_io_context *cic = RQ_CIC(cfqq->next_rq); + + if (sample_valid(cic->ttime_samples) && + cic->ttime_mean < cfqd->cfq_slice_idle) + promote_sync = true; + } + + /* * We have other queues, don't allow more IO from this one */ - if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq)) + if (cfqd->busy_queues > 1 && cfq_slice_used_soon(cfqd, cfqq) && + !promote_sync) return false; /* * Sole queue user, no limit */ - if (cfqd->busy_queues == 1) + if (cfqd->busy_queues == 1 || promote_sync) max_dispatch = -1; else /* @@ -3317,7 +3337,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, cfqd->busy_queues > 1) { cfq_del_timer(cfqd, cfqq); cfq_clear_cfqq_wait_request(cfqq); - __blk_run_queue(cfqd->queue); + __blk_run_queue(cfqd->queue, false); } else { cfq_blkiocg_update_idle_time_stats( &cfqq->cfqg->blkg); @@ -3332,7 +3352,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, * this new queue is RT and the current one is BE */ cfq_preempt_queue(cfqd, cfqq); - __blk_run_queue(cfqd->queue); + __blk_run_queue(cfqd->queue, false); } } @@ -3668,12 +3688,11 @@ new_queue: cfqq->allocated[rw]++; - spin_unlock_irqrestore(q->queue_lock, flags); - cfqq->ref++; rq->elevator_private[0] = cic; rq->elevator_private[1] = cfqq; rq->elevator_private[2] = cfq_ref_get_cfqg(cfqq->cfqg); + spin_unlock_irqrestore(q->queue_lock, flags); return 0; queue_fail: @@ -3693,7 +3712,7 @@ static void cfq_kick_queue(struct work_struct *work) struct request_queue *q = cfqd->queue; spin_lock_irq(q->queue_lock); - __blk_run_queue(cfqd->queue); + __blk_run_queue(cfqd->queue, false); spin_unlock_irq(q->queue_lock); } diff --git a/block/elevator.c b/block/elevator.c index 3ea2082..542ce82 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -604,7 +604,7 @@ void elv_quiesce_start(struct request_queue *q) */ elv_drain_elevator(q); while (q->rq.elvpriv) { - __blk_run_queue(q); + __blk_run_queue(q, false); spin_unlock_irq(q->queue_lock); msleep(10); spin_lock_irq(q->queue_lock); @@ -644,7 +644,7 @@ void elv_insert(struct request_queue *q, struct request *rq, int where) * with anything. There's no point in delaying queue * processing. */ - __blk_run_queue(q); + __blk_run_queue(q, false); break; case ELEVATOR_INSERT_SORT: diff --git a/block/genhd.c b/block/genhd.c index 73d85a8..c91a2da 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1355,7 +1355,7 @@ int invalidate_partition(struct gendisk *disk, int partno) struct block_device *bdev = bdget_disk(disk, partno); if (bdev) { fsync_bdev(bdev); - res = __invalidate_device(bdev); + res = __invalidate_device(bdev, true); bdput(bdev); } return res; @@ -1494,7 +1494,7 @@ void disk_block_events(struct gendisk *disk) void disk_unblock_events(struct gendisk *disk) { if (disk->ev) - __disk_unblock_events(disk, true); + __disk_unblock_events(disk, false); } /** diff --git a/block/ioctl.c b/block/ioctl.c index 9049d46..1124cd2 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -294,9 +294,11 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, return -EINVAL; if (get_user(n, (int __user *) arg)) return -EFAULT; - if (!(mode & FMODE_EXCL) && - blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) - return -EBUSY; + if (!(mode & FMODE_EXCL)) { + bdgrab(bdev); + if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) + return -EBUSY; + } ret = set_blocksize(bdev, n); if (!(mode & FMODE_EXCL)) blkdev_put(bdev, mode | FMODE_EXCL); |
