diff options
Diffstat (limited to 'drivers')
42 files changed, 101 insertions, 591 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 9279272b3732..35658f445fca 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -3170,12 +3170,6 @@ static void do_cciss_request(struct request_queue *q) int sg_index = 0; int chained = 0; - /* We call start_io here in case there is a command waiting on the - * queue that has not been sent. - */ - if (blk_queue_plugged(q)) - goto startio; - queue: creq = blk_peek_request(q); if (!creq) diff --git a/drivers/block/cpqarray.c b/drivers/block/cpqarray.c index 946dad4caef3..b2fceb53e809 100644 --- a/drivers/block/cpqarray.c +++ b/drivers/block/cpqarray.c @@ -911,9 +911,6 @@ static void do_ida_request(struct request_queue *q) struct scatterlist tmp_sg[SG_MAX]; int i, dir, seg; - if (blk_queue_plugged(q)) - goto startio; - queue_next: creq = blk_peek_request(q); if (!creq) diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c index ba95cba192be..aca302492ff2 100644 --- a/drivers/block/drbd/drbd_actlog.c +++ b/drivers/block/drbd/drbd_actlog.c @@ -80,7 +80,7 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev, if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags)) rw |= REQ_FUA; - rw |= REQ_UNPLUG | REQ_SYNC; + rw |= REQ_SYNC; bio = bio_alloc(GFP_NOIO, 1); bio->bi_bdev = bdev->md_bdev; @@ -689,8 +689,6 @@ void drbd_al_to_on_disk_bm(struct drbd_conf *mdev) } } - drbd_blk_run_queue(bdev_get_queue(mdev->ldev->md_bdev)); - /* always (try to) flush bitmap to stable storage */ drbd_md_flush(mdev); diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c index fd42832f785b..0645ca829a94 100644 --- a/drivers/block/drbd/drbd_bitmap.c +++ b/drivers/block/drbd/drbd_bitmap.c @@ -840,7 +840,6 @@ static int bm_rw(struct drbd_conf *mdev, int rw) __must_hold(local) for (i = 0; i < num_pages; i++) bm_page_io_async(mdev, b, i, rw); - drbd_blk_run_queue(bdev_get_queue(mdev->ldev->md_bdev)); wait_event(b->bm_io_wait, atomic_read(&b->bm_async_io) == 0); if (test_bit(BM_MD_IO_ERROR, &b->bm_flags)) { diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 3803a0348937..b0bd27dfc1e8 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -377,7 +377,7 @@ union p_header { #define DP_HARDBARRIER 1 /* depricated */ #define DP_RW_SYNC 2 /* equals REQ_SYNC */ #define DP_MAY_SET_IN_SYNC 4 -#define DP_UNPLUG 8 /* equals REQ_UNPLUG */ +#define DP_UNPLUG 8 /* not used anymore */ #define DP_FUA 16 /* equals REQ_FUA */ #define DP_FLUSH 32 /* equals REQ_FLUSH */ #define DP_DISCARD 64 /* equals REQ_DISCARD */ @@ -2382,20 +2382,6 @@ static inline int drbd_queue_order_type(struct drbd_conf *mdev) return QUEUE_ORDERED_NONE; } -static inline void drbd_blk_run_queue(struct request_queue *q) -{ - if (q && q->unplug_fn) - q->unplug_fn(q); -} - -static inline void drbd_kick_lo(struct drbd_conf *mdev) -{ - if (get_ldev(mdev)) { - drbd_blk_run_queue(bdev_get_queue(mdev->ldev->backing_bdev)); - put_ldev(mdev); - } -} - static inline void drbd_md_flush(struct drbd_conf *mdev) { int r; diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 29cd0dc9fe4f..8a43ce0edeed 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -2477,12 +2477,11 @@ static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw) { if (mdev->agreed_pro_version >= 95) return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) | - (bi_rw & REQ_UNPLUG ? DP_UNPLUG : 0) | (bi_rw & REQ_FUA ? DP_FUA : 0) | (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) | (bi_rw & REQ_DISCARD ? DP_DISCARD : 0); else - return bi_rw & (REQ_SYNC | REQ_UNPLUG) ? DP_RW_SYNC : 0; + return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0; } /* Used to send write requests @@ -2719,35 +2718,6 @@ static int drbd_release(struct gendisk *gd, fmode_t mode) return 0; } -static void drbd_unplug_fn(struct request_queue *q) -{ - struct drbd_conf *mdev = q->queuedata; - - /* unplug FIRST */ - spin_lock_irq(q->queue_lock); - blk_remove_plug(q); - spin_unlock_irq(q->queue_lock); - - /* only if connected */ - spin_lock_irq(&mdev->req_lock); - if (mdev->state.pdsk >= D_INCONSISTENT && mdev->state.conn >= C_CONNECTED) { - D_ASSERT(mdev->state.role == R_PRIMARY); - if (test_and_clear_bit(UNPLUG_REMOTE, &mdev->flags)) { - /* add to the data.work queue, - * unless already queued. - * XXX this might be a good addition to drbd_queue_work - * anyways, to detect "double queuing" ... */ - if (list_empty(&mdev->unplug_work.list)) - drbd_queue_work(&mdev->data.work, - &mdev->unplug_work); - } - } - spin_unlock_irq(&mdev->req_lock); - - if (mdev->state.disk >= D_INCONSISTENT) - drbd_kick_lo(mdev); -} - static void drbd_set_defaults(struct drbd_conf *mdev) { /* This way we get a compile error when sync_conf grows, @@ -3222,9 +3192,7 @@ struct drbd_conf *drbd_new_device(unsigned int minor) blk_queue_max_segment_size(q, DRBD_MAX_SEGMENT_SIZE); blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); blk_queue_merge_bvec(q, drbd_merge_bvec); - q->queue_lock = &mdev->req_lock; /* needed since we use */ - /* plugging on a queue, that actually has no requests! */ - q->unplug_fn = drbd_unplug_fn; + q->queue_lock = &mdev->req_lock; mdev->md_io_page = alloc_page(GFP_KERNEL); if (!mdev->md_io_page) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 24487d4fb202..8e68be939deb 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -187,15 +187,6 @@ static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int return NULL; } -/* kick lower level device, if we have more than (arbitrary number) - * reference counts on it, which typically are locally submitted io - * requests. don't use unacked_cnt, so we speed up proto A and B, too. */ -static void maybe_kick_lo(struct drbd_conf *mdev) -{ - if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark) - drbd_kick_lo(mdev); -} - static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed) { struct drbd_epoch_entry *e; @@ -219,7 +210,6 @@ static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev) LIST_HEAD(reclaimed); struct drbd_epoch_entry *e, *t; - maybe_kick_lo(mdev); spin_lock_irq(&mdev->req_lock); reclaim_net_ee(mdev, &reclaimed); spin_unlock_irq(&mdev->req_lock); @@ -436,8 +426,7 @@ void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head) while (!list_empty(head)) { prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE); spin_unlock_irq(&mdev->req_lock); - drbd_kick_lo(mdev); - schedule(); + io_schedule(); finish_wait(&mdev->ee_wait, &wait); spin_lock_irq(&mdev->req_lock); } @@ -1111,8 +1100,6 @@ next_bio: /* > e->sector, unless this is the first bio */ bio->bi_sector = sector; bio->bi_bdev = mdev->ldev->backing_bdev; - /* we special case some flags in the multi-bio case, see below - * (REQ_UNPLUG) */ bio->bi_rw = rw; bio->bi_private = e; bio->bi_end_io = drbd_endio_sec; @@ -1141,13 +1128,8 @@ next_bio: bios = bios->bi_next; bio->bi_next = NULL; - /* strip off REQ_UNPLUG unless it is the last bio */ - if (bios) - bio->bi_rw &= ~REQ_UNPLUG; - drbd_generic_make_request(mdev, fault_type, bio); } while (bios); - maybe_kick_lo(mdev); return 0; fail: @@ -1167,9 +1149,6 @@ static int receive_Barrier(struct drbd_conf *mdev, enum drbd_packets cmd, unsign inc_unacked(mdev); - if (mdev->net_conf->wire_protocol != DRBD_PROT_C) - drbd_kick_lo(mdev); - mdev->current_epoch->barrier_nr = p->barrier; rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR); @@ -1636,12 +1615,11 @@ static unsigned long write_flags_to_bio(struct drbd_conf *mdev, u32 dpf) { if (mdev->agreed_pro_version >= 95) return (dpf & DP_RW_SYNC ? REQ_SYNC : 0) | - (dpf & DP_UNPLUG ? REQ_UNPLUG : 0) | (dpf & DP_FUA ? REQ_FUA : 0) | (dpf & DP_FLUSH ? REQ_FUA : 0) | (dpf & DP_DISCARD ? REQ_DISCARD : 0); else - return dpf & DP_RW_SYNC ? (REQ_SYNC | REQ_UNPLUG) : 0; + return dpf & DP_RW_SYNC ? REQ_SYNC : 0; } /* mirrored write */ @@ -3556,9 +3534,6 @@ static int receive_skip(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned int data_size) { - if (mdev->state.disk >= D_INCONSISTENT) - drbd_kick_lo(mdev); - /* Make sure we've acked all the TCP data associated * with the data requests being unplugged */ drbd_tcp_quickack(mdev->data.socket); diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 11a75d32a2e2..ad3fc6228f27 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -960,10 +960,6 @@ allocate_barrier: bio_endio(req->private_bio, -EIO); } - /* we need to plug ALWAYS since we possibly need to kick lo_dev. - * we plug after submit, so we won't miss an unplug event */ - drbd_plug_device(mdev); - return 0; fail_conflicting: diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 34f224b018b3..e027446590d3 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -792,7 +792,6 @@ int drbd_resync_finished(struct drbd_conf *mdev) * queue (or even the read operations for those packets * is not finished by now). Retry in 100ms. */ - drbd_kick_lo(mdev); __set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(HZ / 10); w = kmalloc(sizeof(struct drbd_work), GFP_ATOMIC); diff --git a/drivers/block/drbd/drbd_wrappers.h b/drivers/block/drbd/drbd_wrappers.h index defdb5013ea3..53586fa5ae1b 100644 --- a/drivers/block/drbd/drbd_wrappers.h +++ b/drivers/block/drbd/drbd_wrappers.h @@ -45,24 +45,6 @@ static inline void drbd_generic_make_request(struct drbd_conf *mdev, generic_make_request(bio); } -static inline void drbd_plug_device(struct drbd_conf *mdev) -{ - struct request_queue *q; - q = bdev_get_queue(mdev->this_bdev); - - spin_lock_irq(q->queue_lock); - -/* XXX the check on !blk_queue_plugged is redundant, - * implicitly checked in blk_plug_device */ - - if (!blk_queue_plugged(q)) { - blk_plug_device(q); - del_timer(&q->unplug_timer); - /* unplugging should not happen automatically... */ - } - spin_unlock_irq(q->queue_lock); -} - static inline int drbd_crypto_is_hash(struct crypto_tfm *tfm) { return (crypto_tfm_alg_type(tfm) & CRYPTO_ALG_TYPE_HASH_MASK) diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 3851dbc03e05..301d7a9a41a6 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -3838,7 +3838,6 @@ static int __floppy_read_block_0(struct block_device *bdev) bio.bi_end_io = floppy_rb0_complete; submit_bio(READ, &bio); - generic_unplug_device(bdev_get_queue(bdev)); process_fd_request(); wait_for_completion(&complete); diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 79c3079a6203..a076a14ca72d 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -540,17 +540,6 @@ out: return 0; } -/* - * kick off io on the underlying address space - */ -static void loop_unplug(struct request_queue *q) -{ - struct loop_device *lo = q->queuedata; - - queue_flag_clear_unlocked(QUEUE_FLAG_PLUGGED, q); - blk_run_address_space(lo->lo_backing_file->f_mapping); -} - struct switch_request { struct file *file; struct completion wait; @@ -917,7 +906,6 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, */ blk_queue_make_request(lo->lo_queue, loop_make_request); lo->lo_queue->queuedata = lo; - lo->lo_queue->unplug_fn = loop_unplug; if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync) blk_queue_flush(lo->lo_queue, REQ_FLUSH); @@ -1019,7 +1007,6 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev) kthread_stop(lo->lo_thread); - lo->lo_queue->unplug_fn = NULL; lo->lo_backing_file = NULL; loop_release_xfer(lo); diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index a077db27b7c9..07a382eaf0a8 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -1606,8 +1606,6 @@ static int kcdrwd(void *foobar) min_sleep_time = pkt->sleep_time; } - generic_unplug_device(bdev_get_queue(pd->bdev)); - VPRINTK("kcdrwd: sleeping\n"); residue = schedule_timeout(min_sleep_time); VPRINTK("kcdrwd: wake up\n"); diff --git a/drivers/block/umem.c b/drivers/block/umem.c index 9b102abe209c..031ca720d926 100644 --- a/drivers/block/umem.c +++ b/drivers/block/umem.c @@ -241,8 +241,7 @@ static void dump_dmastat(struct cardinfo *card, unsigned int dmastat) * * Whenever IO on the active page completes, the Ready page is activated * and the ex-Active page is clean out and made Ready. - * Otherwise the Ready page is only activated when it becomes full, or - * when mm_unplug_device is called via the unplug_io_fn. + * Otherwise the Ready page is only activated when it becomes full. * * If a request arrives while both pages a full, it is queued, and b_rdev is * overloaded to record whether it was a read or a write. @@ -333,17 +332,6 @@ static inline void reset_page(struct mm_page *page) page->biotail = &page->bio; } -static void mm_unplug_device(struct request_queue *q) -{ - struct cardinfo *card = q->queuedata; - unsigned long flags; - - spin_lock_irqsave(&card->lock, flags); - if (blk_remove_plug(q)) - activate(card); - spin_unlock_irqrestore(&card->lock, flags); -} - /* * If there is room on Ready page, take * one bh off list and add it. @@ -535,7 +523,6 @@ static int mm_make_request(struct request_queue *q, struct bio *bio) *card->biotail = bio; bio->bi_next = NULL; card->biotail = &bio->bi_next; - blk_plug_device(q); spin_unlock_irq(&card->lock); return 0; @@ -897,7 +884,6 @@ static int __devinit mm_pci_probe(struct pci_dev *dev, blk_queue_make_request(card->queue, mm_make_request); card->queue->queue_lock = &card->lock; card->queue->queuedata = card; - card->queue->unplug_fn = mm_unplug_device; tasklet_init(&card->tasklet, process_page, (unsigned long)card); diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c index e88a2cf17711..6f218e014e99 100644 --- a/drivers/ide/ide-atapi.c +++ b/drivers/ide/ide-atapi.c @@ -233,8 +233,7 @@ int ide_queue_sense_rq(ide_drive_t *drive, void *special) drive->hwif->rq = NULL; - elv_add_request(drive->queue, &drive->sense_rq, - ELEVATOR_INSERT_FRONT, 0); + elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT); return 0; } EXPORT_SYMBOL_GPL(ide_queue_sense_rq); diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index a2e29099ee0c..fd1e11799137 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -258,17 +258,10 @@ static int ide_cd_breathe(ide_drive_t *drive, struct request *rq) if (time_after(jiffies, info->write_timeout)) return 0; else { - struct request_queue *q = drive->queue; - unsigned long flags; - /* - * take a breather relying on the unplug timer to kick us again + * take a breather */ - - spin_lock_irqsave(q->queue_lock, flags); - blk_plug_device(q); - spin_unlock_irqrestore(q->queue_lock, flags); - + blk_delay_queue(drive->queue, 1); return 1; } } @@ -1514,8 +1507,6 @@ static int ide_cdrom_setup(ide_drive_t *drive) blk_queue_dma_alignment(q, 31); blk_queue_update_dma_pad(q, 15); - q->unplug_delay = max((1 * HZ) / 1000, 1); - drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED; drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id); diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c index 999dac054bcc..f4077840d3ab 100644 --- a/drivers/ide/ide-io.c +++ b/drivers/ide/ide-io.c @@ -549,8 +549,6 @@ plug_device_2: if (rq) blk_requeue_request(q, rq); - if (!elv_queue_empty(q)) - blk_plug_device(q); } void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq) @@ -562,8 +560,6 @@ void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq) if (rq) blk_requeue_request(q, rq); - if (!elv_queue_empty(q)) - blk_plug_device(q); spin_unlock_irqrestore(q->queue_lock, flags); } diff --git a/drivers/ide/ide-park.c b/drivers/ide/ide-park.c index 88a380c5a470..6ab9ab2a5081 100644 --- a/drivers/ide/ide-park.c +++ b/drivers/ide/ide-park.c @@ -52,7 +52,7 @@ static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout) rq->cmd[0] = REQ_UNPARK_HEADS; rq->cmd_len = 1; rq->cmd_type = REQ_TYPE_SPECIAL; - elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1); + elv_add_request(q, rq, ELEVATOR_INSERT_FRONT); out: return; diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 9a35320fb59f..ca203cb23f3c 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -347,7 +347,7 @@ static void write_page(struct bitmap *bitmap, struct page *page, int wait) atomic_inc(&bitmap->pending_writes); set_buffer_locked(bh); set_buffer_mapped(bh); - submit_bh(WRITE | REQ_UNPLUG | REQ_SYNC, bh); + submit_bh(WRITE | REQ_SYNC, bh); bh = bh->b_this_page; } @@ -1339,8 +1339,7 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect prepare_to_wait(&bitmap->overflow_wait, &__wait, TASK_UNINTERRUPTIBLE); spin_unlock_irq(&bitmap->lock); - md_unplug(bitmap->mddev); - schedule(); + io_schedule(); finish_wait(&bitmap->overflow_wait, &__wait); continue; } diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 4e054bd91664..2c62c1169f78 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -991,11 +991,6 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone) clone->bi_destructor = dm_crypt_bio_destructor; } -static void kcryptd_unplug(struct crypt_config *cc) -{ - blk_unplug(bdev_get_queue(cc->dev->bdev)); -} - static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) { struct crypt_config *cc = io->target->private; @@ -1008,10 +1003,8 @@ static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) * one in order to decrypt the whole bio data *afterwards*. */ clone = bio_alloc_bioset(gfp, bio_segments(base_bio), cc->bs); - if (!clone) { - kcryptd_unplug(cc); + if (!clone) return 1; - } crypt_inc_pending(io); diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index 136d4f71a116..76a5af00a26b 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -352,7 +352,7 @@ static void dispatch_io(int rw, unsigned int num_regions, BUG_ON(num_regions > DM_IO_MAX_REGIONS); if (sync) - rw |= REQ_SYNC | REQ_UNPLUG; + rw |= REQ_SYNC; /* * For multiple regions we need to be careful to rewind diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c index 924f5f0084c2..1bb73a13ca40 100644 --- a/drivers/md/dm-kcopyd.c +++ b/drivers/md/dm-kcopyd.c @@ -37,13 +37,6 @@ struct dm_kcopyd_client { unsigned int nr_pages; unsigned int nr_free_pages; - /* - * Block devices to unplug. - * Non-NULL pointer means that a block device has some pending requests - * and needs to be unplugged. - */ - struct block_device *unplug[2]; - struct dm_io_client *io_client; wait_queue_head_t destroyq; @@ -315,31 +308,6 @@ static int run_complete_job(struct kcopyd_job *job) return 0; } -/* - * Unplug the block device at the specified index. - */ -static void unplug(struct dm_kcopyd_client *kc, int rw) -{ - if (kc->unplug[rw] != NULL) { - blk_unplug(bdev_get_queue(kc->unplug[rw])); - kc->unplug[rw] = NULL; - } -} - -/* - * Prepare block device unplug. If there's another device - * to be unplugged at the same array index, we unplug that - * device first. - */ -static void prepare_unplug(struct dm_kcopyd_client *kc, int rw, - struct block_device *bdev) -{ - if (likely(kc->unplug[rw] == bdev)) - return; - unplug(kc, rw); - kc->unplug[rw] = bdev; -} - static void complete_io(unsigned long error, void *context) { struct kcopyd_job *job = (struct kcopyd_job *) context; @@ -386,16 +354,10 @@ static int run_io_job(struct kcopyd_job *job) .client = job->kc->io_client, }; - if (job->rw == READ) { + if (job->rw == READ) r = dm_io(&io_req, 1, &job->source, NULL); - prepare_unplug(job->kc, READ, job->source.bdev); - } else { - if (job->num_dests > 1) - io_req.bi_rw |= REQ_UNPLUG; + else r = dm_io(&io_req, job->num_dests, job->dests, NULL); - if (!(io_req.bi_rw & REQ_UNPLUG)) - prepare_unplug(job->kc, WRITE, job->dests[0].bdev); - } return r; } @@ -466,6 +428,7 @@ static void do_work(struct work_struct *work) { struct dm_kcopyd_client *kc = container_of(work, struct dm_kcopyd_client, kcopyd_work); + struct blk_plug plug; /* * The order that these are called is *very* important. @@ -473,18 +436,12 @@ static void do_work(struct work_struct *work) * Pages jobs when successful will jump onto the io jobs * list. io jobs call wake when they complete and it all * starts again. - * - * Note that io_jobs add block devices to the unplug array, - * this array is cleared with "unplug" calls. It is thus - * forbidden to run complete_jobs after io_jobs and before - * unplug because the block device could be destroyed in - * job completion callback. */ + blk_start_plug(&plug); process_jobs(&kc->complete_jobs, kc, run_complete_job); process_jobs(&kc->pages_jobs, kc, run_pages_job); process_jobs(&kc->io_jobs, kc, run_io_job); - unplug(kc, READ); - unplug(kc, WRITE); + blk_finish_plug(&plug); } /* @@ -665,8 +622,6 @@ int dm_kcopyd_client_create(unsigned int nr_pages, INIT_LIST_HEAD(&kc->io_jobs); INIT_LIST_HEAD(&kc->pages_jobs); - memset(kc->unplug, 0, sizeof(kc->unplug)); - kc->job_pool = mempool_create_slab_pool(MIN_JOBS, _job_cache); if (!kc->job_pool) goto bad_slab; diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index b9e1e15ef11c..5ef136cdba91 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -394,7 +394,7 @@ static void raid_unplug(struct dm_target_callbacks *cb) { struct raid_set *rs = container_of(cb, struct raid_set, callbacks); - md_raid5_unplug_device(rs->md.private); + md_raid5_kick_device(rs->md.private); } /* diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c index dee326775c60..976ad4688afc 100644 --- a/drivers/md/dm-raid1.c +++ b/drivers/md/dm-raid1.c @@ -842,8 +842,6 @@ static void do_mirror(struct work_struct *work) do_reads(ms, &reads); do_writes(ms, &writes); do_failures(ms, &failures); - - dm_table_unplug_all(ms->ti->table); } /*----------------------------------------------------------------- diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 38e4eb1bb965..f50a7b952257 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1275,29 +1275,6 @@ int dm_table_any_busy_target(struct dm_table *t) return 0; } -void dm_table_unplug_all(struct dm_table *t) -{ - struct dm_dev_internal *dd; - struct list_head *devices = dm_table_get_devices(t); - struct dm_target_callbacks *cb; - - list_for_each_entry(dd, devices, list) { - struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev); - char b[BDEVNAME_SIZE]; - - if (likely(q)) - blk_unplug(q); - else - DMWARN_LIMIT("%s: Cannot unplug nonexistent device %s", - dm_device_name(t->md), - bdevname(dd->dm_dev.bdev, b)); - } - - list_for_each_entry(cb, &t->target_callbacks, list) - if (cb->unplug_fn) - cb->unplug_fn(cb); -} - struct mapped_device *dm_table_get_md(struct dm_table *t) { return t->md; @@ -1345,4 +1322,3 @@ EXPORT_SYMBOL(dm_table_get_mode); EXPORT_SYMBOL(dm_table_get_md); EXPORT_SYMBOL(dm_table_put); EXPORT_SYMBOL(dm_table_get); -EXPORT_SYMBOL(dm_table_unplug_all); diff --git a/drivers/md/dm.c b/drivers/md/dm.c index eaa3af0e0632..d22b9905c168 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -807,8 +807,6 @@ void dm_requeue_unmapped_request(struct request *clone) dm_unprep_request(rq); spin_lock_irqsave(q->queue_lock, flags); - if (elv_queue_empty(q)) - blk_plug_device(q); blk_requeue_request(q, rq); spin_unlock_irqrestore(q->queue_lock, flags); @@ -1613,10 +1611,10 @@ static void dm_request_fn(struct request_queue *q) * number of in-flight I/Os after the queue is stopped in * dm_suspend(). */ - while (!blk_queue_plugged(q) && !blk_queue_stopped(q)) { + while (!blk_queue_stopped(q)) { rq = blk_peek_request(q); if (!rq) - goto plug_and_out; + goto delay_and_out; /* always use block 0 to find the target for flushes for now */ pos = 0; @@ -1627,7 +1625,7 @@ static void dm_request_fn(struct request_queue *q) BUG_ON(!dm_target_is_valid(ti)); if (ti->type->busy && ti->type->busy(ti)) - goto plug_and_out; + goto delay_and_out; blk_start_request(rq); clone = rq->special; @@ -1647,11 +1645,8 @@ requeued: BUG_ON(!irqs_disabled()); spin_lock(q->queue_lock); -plug_and_out: - if (!elv_queue_empty(q)) - /* Some requests still remain, retry later */ - blk_plug_device(q); - +delay_and_out: + blk_delay_queue(q, HZ / 10); out: dm_table_put(map); @@ -1680,20 +1675,6 @@ static int dm_lld_busy(struct request_queue *q) return r; } -static void dm_unplug_all(struct request_queue *q) -{ - struct mapped_device *md = q->queuedata; - struct dm_table *map = dm_get_live_table(md); - - if (map) { - if (dm_request_based(md)) - generic_unplug_device(q); - - dm_table_unplug_all(map); - dm_table_put(map); - } -} - static int dm_any_congested(void *congested_data, int bdi_bits) { int r = bdi_bits; @@ -1817,7 +1798,6 @@ static void dm_init_md_queue(struct mapped_device *md) md->queue->backing_dev_info.congested_data = md; blk_queue_make_request(md->queue, dm_request); blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY); - md->queue->unplug_fn = dm_unplug_all; blk_queue_merge_bvec(md->queue, dm_merge_bvec); blk_queue_flush(md->queue, REQ_FLUSH | REQ_FUA); } @@ -2263,8 +2243,6 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible) int r = 0; DECLARE_WAITQUEUE(wait, current); - dm_unplug_all(md->queue); - add_wait_queue(&md->wait, &wait); while (1) { @@ -2539,7 +2517,6 @@ int dm_resume(struct mapped_device *md) clear_bit(DMF_SUSPENDED, &md->flags); - dm_table_unplug_all(map); r = 0; out: dm_table_put(map); diff --git a/drivers/md/linear.c b/drivers/md/linear.c index 0ed7f6bc2a7f..338804f8fb3b 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -87,22 +87,6 @@ static int linear_mergeable_bvec(struct request_queue *q, return maxsectors << 9; } -static void linear_unplug(struct request_queue *q) -{ - mddev_t *mddev = q->queuedata; - linear_conf_t *conf; - int i; - - rcu_read_lock(); - conf = rcu_dereference(mddev->private); - - for (i=0; i < mddev->raid_disks; i++) { - struct request_queue *r_queue = bdev_get_queue(conf->disks[i].rdev->bdev); - blk_unplug(r_queue); - } - rcu_read_unlock(); -} - static int linear_congested(void *data, int bits) { mddev_t *mddev = data; @@ -224,7 +208,6 @@ static int linear_run (mddev_t *mddev) md_set_array_sectors(mddev, linear_size(mddev, 0, 0)); blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec); - mddev->queue->unplug_fn = linear_unplug; mddev->queue->backing_dev_info.congested_fn = linear_congested; mddev->queue->backing_dev_info.congested_data = mddev; md_integrity_register(mddev); diff --git a/drivers/md/md.c b/drivers/md/md.c index 818313e277e7..86ba66c0b28a 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -780,8 +780,7 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, bio->bi_end_io = super_written; atomic_inc(&mddev->pending_writes); - submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA, - bio); + submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio); } void md_super_wait(mddev_t *mddev) @@ -809,7 +808,7 @@ int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, struct completion event; int ret; - rw |= REQ_SYNC | REQ_UNPLUG; + rw |= REQ_SYNC; bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; @@ -4817,7 +4816,6 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) __md_stop_writes(mddev); md_stop(mddev); mddev->queue->merge_bvec_fn = NULL; - mddev->queue->unplug_fn = NULL; mddev->queue->backing_dev_info.congested_fn = NULL; /* tell userspace to handle 'inactive' */ @@ -6692,8 +6690,6 @@ EXPORT_SYMBOL_GPL(md_allow_write); void md_unplug(mddev_t *mddev) { - if (mddev->queue) - blk_unplug(mddev->queue); if (mddev->plug) mddev->plug->unplug_fn(mddev->plug); } @@ -6876,7 +6872,6 @@ void md_do_sync(mddev_t *mddev) >= mddev->resync_max - mddev->curr_resync_completed )) { /* time to update curr_resync_completed */ - md_unplug(mddev); wait_event(mddev->recovery_wait, atomic_read(&mddev->recovery_active) == 0); mddev->curr_resync_completed = j; @@ -6952,7 +6947,6 @@ void md_do_sync(mddev_t *mddev) * about not overloading the IO subsystem. (things like an * e2fsck being done on the RAID array should execute fast) */ - md_unplug(mddev); cond_resched(); currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 @@ -6971,8 +6965,6 @@ void md_do_sync(mddev_t *mddev) * this also signals 'finished resyncing' to md_stop */ out: - md_unplug(mddev); - wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); /* tell personality that we are finished */ diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 3a62d440e27b..5e694b151c30 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -106,36 +106,6 @@ static void multipath_end_request(struct bio *bio, int error) rdev_dec_pending(rdev, conf->mddev); } -static void unplug_slaves(mddev_t *mddev) -{ - multipath_conf_t *conf = mddev->private; - int i; - - rcu_read_lock(); - for (i=0; i<mddev->raid_disks; i++) { - mdk_rdev_t *rdev = rcu_dereference(conf->multipaths[i].rdev); - if (rdev && !test_bit(Faulty, &rdev->flags) - && atomic_read(&rdev->nr_pending)) { - struct request_queue *r_queue = bdev_get_queue(rdev->bdev); - - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - - blk_unplug(r_queue); - - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - } - } - rcu_read_unlock(); -} - -static void multipath_unplug(struct request_queue *q) -{ - unplug_slaves(q->queuedata); -} - - static int multipath_make_request(mddev_t *mddev, struct bio * bio) { multipath_conf_t *conf = mddev->private; @@ -517,7 +487,6 @@ static int multipath_run (mddev_t *mddev) */ md_set_array_sectors(mddev, multipath_size(mddev, 0, 0)); - mddev->queue->unplug_fn = multipath_unplug; mddev->queue->backing_dev_info.congested_fn = multipath_congested; mddev->queue->backing_dev_info.congested_data = mddev; md_integrity_register(mddev); diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index c0ac457f1218..95916fd6394a 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -25,21 +25,6 @@ #include "raid0.h" #include "raid5.h" -static void raid0_unplug(struct request_queue *q) -{ - mddev_t *mddev = q->queuedata; - raid0_conf_t *conf = mddev->private; - mdk_rdev_t **devlist = conf->devlist; - int raid_disks = conf->strip_zone[0].nb_dev; - int i; - - for (i=0; i < raid_disks; i++) { - struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev); - - blk_unplug(r_queue); - } -} - static int raid0_congested(void *data, int bits) { mddev_t *mddev = data; @@ -272,7 +257,6 @@ static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf) mdname(mddev), (unsigned long long)smallest->sectors); } - mddev->queue->unplug_fn = raid0_unplug; mddev->queue->backing_dev_info.congested_fn = raid0_congested; mddev->queue->backing_dev_info.congested_data = mddev; diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 06cd712807d0..8f34ad5c478b 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -52,23 +52,16 @@ #define NR_RAID1_BIOS 256 -static void unplug_slaves(mddev_t *mddev); - static void allow_barrier(conf_t *conf); static void lower_barrier(conf_t *conf); static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) { struct pool_info *pi = data; - r1bio_t *r1_bio; int size = offsetof(r1bio_t, bios[pi->raid_disks]); /* allocate a r1bio with room for raid_disks entries in the bios array */ - r1_bio = kzalloc(size, gfp_flags); - if (!r1_bio && pi->mddev) - unplug_slaves(pi->mddev); - - return r1_bio; + return kzalloc(size, gfp_flags); } static void r1bio_pool_free(void *r1_bio, void *data) @@ -91,10 +84,8 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) int i, j; r1_bio = r1bio_pool_alloc(gfp_flags, pi); - if (!r1_bio) { - unplug_slaves(pi->mddev); + if (!r1_bio) return NULL; - } /* * Allocate bios : 1 for reading, n-1 for writing @@ -520,37 +511,6 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio) return new_disk; } -static void unplug_slaves(mddev_t *mddev) -{ - conf_t *conf = mddev->private; - int i; - - rcu_read_lock(); - for (i=0; i<mddev->raid_disks; i++) { - mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); - if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { - struct request_queue *r_queue = bdev_get_queue(rdev->bdev); - - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - - blk_unplug(r_queue); - - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - } - } - rcu_read_unlock(); -} - -static void raid1_unplug(struct request_queue *q) -{ - mddev_t *mddev = q->queuedata; - - unplug_slaves(mddev); - md_wakeup_thread(mddev->thread); -} - static int raid1_congested(void *data, int bits) { mddev_t *mddev = data; @@ -580,23 +540,16 @@ static int raid1_congested(void *data, int bits) } -static int flush_pending_writes(conf_t *conf) +static void flush_pending_writes(conf_t *conf) { /* Any writes that have been queued but are awaiting * bitmap updates get flushed here. - * We return 1 if any requests were actually submitted. */ - int rv = 0; - spin_lock_irq(&conf->device_lock); if (conf->pending_bio_list.head) { struct bio *bio; bio = bio_list_get(&conf->pending_bio_list); - /* Only take the spinlock to quiet a warning */ - spin_lock(conf->mddev->queue->queue_lock); - blk_remove_plug(conf->mddev->queue); - spin_unlock(conf->mddev->queue->queue_lock); spin_unlock_irq(&conf->device_lock); /* flush any pending bitmap writes to * disk before proceeding w/ I/O */ @@ -608,10 +561,14 @@ static int flush_pending_writes(conf_t *conf) generic_make_request(bio); bio = next; } - rv = 1; } else spin_unlock_irq(&conf->device_lock); - return rv; +} + +static void md_kick_device(mddev_t *mddev) +{ + blk_flush_plug(current); + md_wakeup_thread(mddev->thread); } /* Barriers.... @@ -643,8 +600,7 @@ static void raise_barrier(conf_t *conf) /* Wait until no block IO is waiting */ wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, - conf->resync_lock, - raid1_unplug(conf->mddev->queue)); + conf->resync_lock, md_kick_device(conf->mddev)); /* block any new IO from starting */ conf->barrier++; @@ -652,8 +608,7 @@ static void raise_barrier(conf_t *conf) /* Now wait for all pending IO to complete */ wait_event_lock_irq(conf->wait_barrier, !conf->nr_pending && conf->barrier < RESYNC_DEPTH, - conf->resync_lock, - raid1_unplug(conf->mddev->queue)); + conf->resync_lock, md_kick_device(conf->mddev)); spin_unlock_irq(&conf->resync_lock); } @@ -675,7 +630,7 @@ static void wait_barrier(conf_t *conf) conf->nr_waiting++; wait_event_lock_irq(conf->wait_barrier, !conf->barrier, conf->resync_lock, - raid1_unplug(conf->mddev->queue)); + md_kick_device(conf->mddev)); conf->nr_waiting--; } conf->nr_pending++; @@ -712,7 +667,7 @@ static void freeze_array(conf_t *conf) conf->nr_pending == conf->nr_queued+1, conf->resync_lock, ({ flush_pending_writes(conf); - raid1_unplug(conf->mddev->queue); })); + md_kick_device(conf->mddev); })); spin_unlock_irq(&conf->resync_lock); } static void unfreeze_array(conf_t *conf) @@ -962,7 +917,6 @@ static int make_request(mddev_t *mddev, struct bio * bio) atomic_inc(&r1_bio->remaining); spin_lock_irqsave(&conf->device_lock, flags); bio_list_add(&conf->pending_bio_list, mbio); - blk_plug_device_unlocked(mddev->queue); spin_unlock_irqrestore(&conf->device_lock, flags); } r1_bio_write_done(r1_bio, bio->bi_vcnt, behind_pages, behind_pages != NULL); @@ -971,7 +925,7 @@ static int make_request(mddev_t *mddev, struct bio * bio) /* In case raid1d snuck in to freeze_array */ wake_up(&conf->wait_barrier); - if (do_sync) + if (do_sync || !bitmap) md_wakeup_thread(mddev->thread); return 0; @@ -1561,7 +1515,6 @@ static void raid1d(mddev_t *mddev) unsigned long flags; conf_t *conf = mddev->private; struct list_head *head = &conf->retry_list; - int unplug=0; mdk_rdev_t *rdev; md_check_recovery(mddev); @@ -1569,7 +1522,7 @@ static void raid1d(mddev_t *mddev) for (;;) { char b[BDEVNAME_SIZE]; - unplug += flush_pending_writes(conf); + flush_pending_writes(conf); spin_lock_irqsave(&conf->device_lock, flags); if (list_empty(head)) { @@ -1583,10 +1536,9 @@ static void raid1d(mddev_t *mddev) mddev = r1_bio->mddev; conf = mddev->private; - if (test_bit(R1BIO_IsSync, &r1_bio->state)) { + if (test_bit(R1BIO_IsSync, &r1_bio->state)) sync_request_write(mddev, r1_bio); - unplug = 1; - } else { + else { int disk; /* we got a read error. Maybe the drive is bad. Maybe just @@ -1636,14 +1588,11 @@ static void raid1d(mddev_t *mddev) bio->bi_end_io = raid1_end_read_request; bio->bi_rw = READ | do_sync; bio->bi_private = r1_bio; - unplug = 1; generic_make_request(bio); } } cond_resched(); } - if (unplug) - unplug_slaves(mddev); } @@ -2066,7 +2015,6 @@ static int run(mddev_t *mddev) md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); - mddev->queue->unplug_fn = raid1_unplug; mddev->queue->backing_dev_info.congested_fn = raid1_congested; mddev->queue->backing_dev_info.congested_data = mddev; md_integrity_register(mddev); diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 747d061d8e05..c0d0f5f7e407 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -57,23 +57,16 @@ */ #define NR_RAID10_BIOS 256 -static void unplug_slaves(mddev_t *mddev); - static void allow_barrier(conf_t *conf); static void lower_barrier(conf_t *conf); static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data) { conf_t *conf = data; - r10bio_t *r10_bio; int size = offsetof(struct r10bio_s, devs[conf->copies]); /* allocate a r10bio with room for raid_disks entries in the bios array */ - r10_bio = kzalloc(size, gfp_flags); - if (!r10_bio && conf->mddev) - unplug_slaves(conf->mddev); - - return r10_bio; + return kzalloc(size, gfp_flags); } static void r10bio_pool_free(void *r10_bio, void *data) @@ -106,10 +99,8 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) int nalloc; r10_bio = r10bio_pool_alloc(gfp_flags, conf); - if (!r10_bio) { - unplug_slaves(conf->mddev); + if (!r10_bio) return NULL; - } if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery)) nalloc = conf->copies; /* resync */ @@ -597,37 +588,6 @@ rb_out: return disk; } -static void unplug_slaves(mddev_t *mddev) -{ - conf_t *conf = mddev->private; - int i; - - rcu_read_lock(); - for (i=0; i < conf->raid_disks; i++) { - mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); - if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { - struct request_queue *r_queue = bdev_get_queue(rdev->bdev); - - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - - blk_unplug(r_queue); - - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - } - } - rcu_read_unlock(); -} - -static void raid10_unplug(struct request_queue *q) -{ - mddev_t *mddev = q->queuedata; - - unplug_slaves(q->queuedata); - md_wakeup_thread(mddev->thread); -} - static int raid10_congested(void *data, int bits) { mddev_t *mddev = data; @@ -649,23 +609,16 @@ static int raid10_congested(void *data, int bits) return ret; } -static int flush_pending_writes(conf_t *conf) +static void flush_pending_writes(conf_t *conf) { /* Any writes that have been queued but are awaiting * bitmap updates get flushed here. - * We return 1 if any requests were actually submitted. */ - int rv = 0; - spin_lock_irq(&conf->device_lock); if (conf->pending_bio_list.head) { struct bio *bio; bio = bio_list_get(&conf->pending_bio_list); - /* Spinlock only taken to quiet a warning */ - spin_lock(conf->mddev->queue->queue_lock); - blk_remove_plug(conf->mddev->queue); - spin_unlock(conf->mddev->queue->queue_lock); spin_unlock_irq(&conf->device_lock); /* flush any pending bitmap writes to disk * before proceeding w/ I/O */ @@ -677,11 +630,16 @@ static int flush_pending_writes(conf_t *conf) generic_make_request(bio); bio = next; } - rv = 1; } else spin_unlock_irq(&conf->device_lock); - return rv; } + +static void md_kick_device(mddev_t *mddev) +{ + blk_flush_plug(current); + md_wakeup_thread(mddev->thread); +} + /* Barriers.... * Sometimes we need to suspend IO while we do something else, * either some resync/recovery, or reconfigure the array. @@ -711,8 +669,7 @@ static void raise_barrier(conf_t *conf, int force) /* Wait until no block IO is waiting (unless 'force') */ wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting, - conf->resync_lock, - raid10_unplug(conf->mddev->queue)); + conf->resync_lock, md_kick_device(conf->mddev)); /* block any new IO from starting */ conf->barrier++; @@ -720,8 +677,7 @@ static void raise_barrier(conf_t *conf, int force) /* No wait for all pending IO to complete */ wait_event_lock_irq(conf->wait_barrier, !conf->nr_pending && conf->barrier < RESYNC_DEPTH, - conf->resync_lock, - raid10_unplug(conf->mddev->queue)); + conf->resync_lock, md_kick_device(conf->mddev)); spin_unlock_irq(&conf->resync_lock); } @@ -742,7 +698,7 @@ static void wait_barrier(conf_t *conf) conf->nr_waiting++; wait_event_lock_irq(conf->wait_barrier, !conf->barrier, conf->resync_lock, - raid10_unplug(conf->mddev->queue)); + md_kick_device(conf->mddev)); conf->nr_waiting--; } conf->nr_pending++; @@ -779,7 +735,7 @@ static void freeze_array(conf_t *conf) conf->nr_pending == conf->nr_queued+1, conf->resync_lock, ({ flush_pending_writes(conf); - raid10_unplug(conf->mddev->queue); })); + md_kick_device(conf->mddev); })); spin_unlock_irq(&conf->resync_lock); } @@ -974,7 +930,6 @@ static int make_request(mddev_t *mddev, struct bio * bio) atomic_inc(&r10_bio->remaining); spin_lock_irqsave(&conf->device_lock, flags); bio_list_add(&conf->pending_bio_list, mbio); - blk_plug_device_unlocked(mddev->queue); spin_unlock_irqrestore(&conf->device_lock, flags); } @@ -991,7 +946,7 @@ static int make_request(mddev_t *mddev, struct bio * bio) /* In case raid10d snuck in to freeze_array */ wake_up(&conf->wait_barrier); - if (do_sync) + if (do_sync || !mddev->bitmap) md_wakeup_thread(mddev->thread); return 0; @@ -1684,7 +1639,6 @@ static void raid10d(mddev_t *mddev) unsigned long flags; conf_t *conf = mddev->private; struct list_head *head = &conf->retry_list; - int unplug=0; mdk_rdev_t *rdev; md_check_recovery(mddev); @@ -1692,7 +1646,7 @@ static void raid10d(mddev_t *mddev) for (;;) { char b[BDEVNAME_SIZE]; - unplug += flush_pending_writes(conf); + flush_pending_writes(conf); spin_lock_irqsave(&conf->device_lock, flags); if (list_empty(head)) { @@ -1706,13 +1660,11 @@ static void raid10d(mddev_t *mddev) mddev = r10_bio->mddev; conf = mddev->private; - if (test_bit(R10BIO_IsSync, &r10_bio->state)) { + if (test_bit(R10BIO_IsSync, &r10_bio->state)) sync_request_write(mddev, r10_bio); - unplug = 1; - } else if (test_bit(R10BIO_IsRecover, &r10_bio->state)) { + else if (test_bit(R10BIO_IsRecover, &r10_bio->state)) recovery_request_write(mddev, r10_bio); - unplug = 1; - } else { + else { int mirror; /* we got a read error. Maybe the drive is bad. Maybe just * the block and we can fix it. @@ -1759,14 +1711,11 @@ static void raid10d(mddev_t *mddev) bio->bi_rw = READ | do_sync; bio->bi_private = r10_bio; bio->bi_end_io = raid10_end_read_request; - unplug = 1; generic_make_request(bio); } } cond_resched(); } - if (unplug) - unplug_slaves(mddev); } @@ -2377,7 +2326,6 @@ static int run(mddev_t *mddev) md_set_array_sectors(mddev, size); mddev->resync_max_sectors = size; - mddev->queue->unplug_fn = raid10_unplug; mddev->queue->backing_dev_info.congested_fn = raid10_congested; mddev->queue->backing_dev_info.congested_data = mddev; diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 78536fdbd87f..e867ee42b152 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -433,8 +433,6 @@ static int has_failed(raid5_conf_t *conf) return 0; } -static void unplug_slaves(mddev_t *mddev); - static struct stripe_head * get_active_stripe(raid5_conf_t *conf, sector_t sector, int previous, int noblock, int noquiesce) @@ -463,8 +461,7 @@ get_active_stripe(raid5_conf_t *conf, sector_t sector, < (conf->max_nr_stripes *3/4) || !conf->inactive_blocked), conf->device_lock, - md_raid5_unplug_device(conf) - ); + md_raid5_kick_device(conf)); conf->inactive_blocked = 0; } else init_stripe(sh, sector, previous); @@ -1473,8 +1470,7 @@ static int resize_stripes(raid5_conf_t *conf, int newsize) wait_event_lock_irq(conf->wait_for_stripe, !list_empty(&conf->inactive_list), conf->device_lock, - unplug_slaves(conf->mddev) - ); + blk_flush_plug(current)); osh = get_free_stripe(conf); spin_unlock_irq(&conf->device_lock); atomic_set(&nsh->count, 1); @@ -3645,58 +3641,19 @@ static void activate_bit_delay(raid5_conf_t *conf) } } -static void unplug_slaves(mddev_t *mddev) +void md_raid5_kick_device(raid5_conf_t *conf) { - raid5_conf_t *conf = mddev->private; - int i; - int devs = max(conf->raid_disks, conf->previous_raid_disks); - - rcu_read_lock(); - for (i = 0; i < devs; i++) { - mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev); - if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { - struct request_queue *r_queue = bdev_get_queue(rdev->bdev); - - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - - blk_unplug(r_queue); - - rdev_dec_pending(rdev, mddev); - rcu_read_lock(); - } - } - rcu_read_unlock(); -} - -void md_raid5_unplug_device(raid5_conf_t *conf) -{ - unsigned long flags; - - spin_lock_irqsave(&conf->device_lock, flags); - - if (plugger_remove_plug(&conf->plug)) { - conf->seq_flush++; - raid5_activate_delayed(conf); - } + blk_flush_plug(current); + raid5_activate_delayed(conf); md_wakeup_thread(conf->mddev->thread); - - spin_unlock_irqrestore(&conf->device_lock, flags); - - unplug_slaves(conf->mddev); } -EXPORT_SYMBOL_GPL(md_raid5_unplug_device); +EXPORT_SYMBOL_GPL(md_raid5_kick_device); static void raid5_unplug(struct plug_handle *plug) { raid5_conf_t *conf = container_of(plug, raid5_conf_t, plug); - md_raid5_unplug_device(conf); -} -static void raid5_unplug_queue(struct request_queue *q) -{ - mddev_t *mddev = q->queuedata; - md_raid5_unplug_device(mddev->private); + md_raid5_kick_device(conf); } int md_raid5_congested(mddev_t *mddev, int bits) @@ -4100,7 +4057,7 @@ static int make_request(mddev_t *mddev, struct bio * bi) * add failed due to overlap. Flush everything * and wait a while */ - md_raid5_unplug_device(conf); + md_raid5_kick_device(conf); release_stripe(sh); schedule(); goto retry; @@ -4365,7 +4322,6 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski if (sector_nr >= max_sector) { /* just being told to finish up .. nothing much to do */ - unplug_slaves(mddev); if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { end_reshape(conf); @@ -4569,7 +4525,6 @@ static void raid5d(mddev_t *mddev) spin_unlock_irq(&conf->device_lock); async_tx_issue_pending_all(); - unplug_slaves(mddev); pr_debug("--- raid5d inactive\n"); } @@ -5204,7 +5159,7 @@ static int run(mddev_t *mddev) mddev->queue->backing_dev_info.congested_data = mddev; mddev->queue->backing_dev_info.congested_fn = raid5_congested; - mddev->queue->unplug_fn = raid5_unplug_queue; + mddev->queue->queue_lock = &conf->device_lock; chunk_size = mddev->chunk_sectors << 9; blk_queue_io_min(mddev->queue, chunk_size); diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 2ace0582b409..8d563a4f022a 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -503,6 +503,6 @@ static inline int algorithm_is_DDF(int layout) } extern int md_raid5_congested(mddev_t *mddev, int bits); -extern void md_raid5_unplug_device(raid5_conf_t *conf); +extern void md_raid5_kick_device(raid5_conf_t *conf); extern int raid5_set_cache_size(mddev_t *mddev, int size); #endif diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c index f81c25d4a125..47ec5bc0ed21 100644 --- a/drivers/message/i2o/i2o_block.c +++ b/drivers/message/i2o/i2o_block.c @@ -897,11 +897,7 @@ static void i2o_block_request_fn(struct request_queue *q) { struct request *req; - while (!blk_queue_plugged(q)) { - req = blk_peek_request(q); - if (!req) - break; - + while ((req = blk_peek_request(q)) != NULL) { if (req->cmd_type == REQ_TYPE_FS) { struct i2o_block_delayed_request *dreq; struct i2o_block_request *ireq = req->special; diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c index 4e42d030e097..2ae727568df9 100644 --- a/drivers/mmc/card/queue.c +++ b/drivers/mmc/card/queue.c @@ -55,8 +55,7 @@ static int mmc_queue_thread(void *d) spin_lock_irq(q->queue_lock); set_current_state(TASK_INTERRUPTIBLE); - if (!blk_queue_plugged(q)) - req = blk_fetch_request(q); + req = blk_fetch_request(q); mq->req = req; spin_unlock_irq(q->queue_lock); diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 794bfd962266..4d2df2f76ea0 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1917,7 +1917,7 @@ static void __dasd_process_request_queue(struct dasd_block *block) return; } /* Now we try to fetch requests from the request queue */ - while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) { + while ((req = blk_peek_request(queue))) { if (basedev->features & DASD_FEATURE_READONLY && rq_data_dir(req) == WRITE) { DBF_DEV_EVENT(DBF_ERR, basedev, diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c index ad8431636012..83cea9a55e2f 100644 --- a/drivers/s390/char/tape_block.c +++ b/drivers/s390/char/tape_block.c @@ -161,7 +161,6 @@ tapeblock_requeue(struct work_struct *work) { spin_lock_irq(&device->blk_data.request_queue_lock); while ( - !blk_queue_plugged(queue) && blk_peek_request(queue) && nr_queued < TAPEBLOCK_MIN_REQUEUE ) { diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index fb2bb35c62cb..bf80a4c5a481 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -67,6 +67,13 @@ static struct scsi_host_sg_pool scsi_sg_pools[] = { struct kmem_cache *scsi_sdb_cache; +/* + * When to reinvoke queueing after a resource shortage. It's 3 msecs to + * not change behaviour from the previous unplug mechanism, experimentation + * may prove this needs changing. + */ +#define SCSI_QUEUE_DELAY 3 + static void scsi_run_queue(struct request_queue *q); /* @@ -149,14 +156,7 @@ static int __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, int unbusy) /* * Requeue this command. It will go before all other commands * that are already in the queue. - * - * NOTE: there is magic here about the way the queue is plugged if - * we have no outstanding commands. - * - * Although we *don't* plug the queue, we call the request - * function. The SCSI request function detects the blocked condition - * and plugs the queue appropriately. - */ + */ spin_lock_irqsave(q->queue_lock, flags); blk_requeue_request(q, cmd->request); spin_unlock_irqrestore(q->queue_lock, flags); @@ -1194,11 +1194,11 @@ int scsi_prep_return(struct request_queue *q, struct request *req, int ret) case BLKPREP_DEFER: /* * If we defer, the blk_peek_request() returns NULL, but the - * queue must be restarted, so we plug here if no returning - * command will automatically do that. + * queue must be restarted, so we schedule a callback to happen + * shortly. */ if (sdev->device_busy == 0) - blk_plug_device(q); + blk_delay_queue(q, SCSI_QUEUE_DELAY); break; default: req->cmd_flags |= REQ_DONTPREP; @@ -1237,7 +1237,7 @@ static inline int scsi_dev_queue_ready(struct request_queue *q, sdev_printk(KERN_INFO, sdev, "unblocking device at zero depth\n")); } else { - blk_plug_device(q); + blk_delay_queue(q, SCSI_QUEUE_DELAY); return 0; } } @@ -1467,7 +1467,7 @@ static void scsi_request_fn(struct request_queue *q) * the host is no longer able to accept any more requests. */ shost = sdev->host; - while (!blk_queue_plugged(q)) { + for (;;) { int rtn; /* * get next queueable request. We do this early to make sure @@ -1546,15 +1546,8 @@ static void scsi_request_fn(struct request_queue *q) */ rtn = scsi_dispatch_cmd(cmd); spin_lock_irq(q->queue_lock); - if(rtn) { - /* we're refusing the command; because of - * the way locks get dropped, we need to - * check here if plugging is required */ - if(sdev->device_busy == 0) - blk_plug_device(q); - - break; - } + if (rtn) + goto out_delay; } goto out; @@ -1573,9 +1566,10 @@ static void scsi_request_fn(struct request_queue *q) spin_lock_irq(q->queue_lock); blk_requeue_request(q, req); sdev->device_busy--; - if(sdev->device_busy == 0) - blk_plug_device(q); - out: +out_delay: + if (sdev->device_busy == 0) + blk_delay_queue(q, SCSI_QUEUE_DELAY); +out: /* must be careful here...if we trigger the ->remove() function * we cannot be holding the q lock */ spin_unlock_irq(q->queue_lock); diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 5c3ccfc6b622..2941d2d92c94 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -3913,7 +3913,7 @@ fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost, if (!get_device(dev)) return; - while (!blk_queue_plugged(q)) { + while (1) { if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) && !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) break; diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c index 927e99cb7225..c6fcf76cade5 100644 --- a/drivers/scsi/scsi_transport_sas.c +++ b/drivers/scsi/scsi_transport_sas.c @@ -173,11 +173,7 @@ static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost, int ret; int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *); - while (!blk_queue_plugged(q)) { - req = blk_fetch_request(q); - if (!req) - break; - + while ((req = blk_fetch_request(q)) != NULL) { spin_unlock_irq(q->queue_lock); handler = to_sas_internal(shost->transportt)->f->smp_handler; diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index 67f0c09983c8..c1b539d7b0d3 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -392,9 +392,8 @@ static int iblock_do_task(struct se_task *task) { struct se_device *dev = task->task_se_cmd->se_dev; struct iblock_req *req = IBLOCK_REQ(task); - struct iblock_dev *ibd = (struct iblock_dev *)req->ib_dev; - struct request_queue *q = bdev_get_queue(ibd->ibd_bd); struct bio *bio = req->ib_bio, *nbio = NULL; + struct blk_plug plug; int rw; if (task->task_data_direction == DMA_TO_DEVICE) { @@ -412,6 +411,7 @@ static int iblock_do_task(struct se_task *task) rw = READ; } + blk_start_plug(&plug); while (bio) { nbio = bio->bi_next; bio->bi_next = NULL; @@ -421,9 +421,8 @@ static int iblock_do_task(struct se_task *task) submit_bio(rw, bio); bio = nbio; } + blk_finish_plug(&plug); - if (q->unplug_fn) - q->unplug_fn(q); return PYX_TRANSPORT_SENT_TO_TRANSPORT; } |