block: remove per-queue plugging
Code has been converted over to the new explicit on-stack plugging,
and delay users have been converted to use the new API for that.
So lets kill off the old plugging along with aops->sync_page().
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index a23ffa3..b67d822 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 @@
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 @@
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;
@@ -580,20 +540,16 @@
}
-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);
- blk_remove_plug(conf->mddev->queue);
spin_unlock_irq(&conf->device_lock);
/* flush any pending bitmap writes to
* disk before proceeding w/ I/O */
@@ -605,10 +561,14 @@
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....
@@ -640,8 +600,7 @@
/* 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++;
@@ -649,8 +608,7 @@
/* 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);
}
@@ -672,7 +630,7 @@
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++;
@@ -709,7 +667,7 @@
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)
@@ -959,7 +917,6 @@
atomic_inc(&r1_bio->remaining);
spin_lock_irqsave(&conf->device_lock, flags);
bio_list_add(&conf->pending_bio_list, mbio);
- blk_plug_device(mddev->queue);
spin_unlock_irqrestore(&conf->device_lock, flags);
}
r1_bio_write_done(r1_bio, bio->bi_vcnt, behind_pages, behind_pages != NULL);
@@ -968,7 +925,7 @@
/* 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;
@@ -1558,7 +1515,6 @@
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);
@@ -1566,7 +1522,7 @@
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)) {
@@ -1580,10 +1536,9 @@
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
@@ -1633,14 +1588,11 @@
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);
}
@@ -2064,7 +2016,6 @@
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);