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Merge tag 'md-3.6' of git://neil.brown.name/md

Browse Source 
Pull additional md update from NeilBrown:
 "This contains a few patches that depend on plugging changes in the
  block layer so needed to wait for those.

  It also contains a Kconfig fix for the new RAID10 support in dm-raid."

* tag 'md-3.6' of git://neil.brown.name/md:
  md/dm-raid: DM_RAID should select MD_RAID10
  md/raid1: submit IO from originating thread instead of md thread.
  raid5: raid5d handle stripe in batch way
  raid5: make_request use batch stripe release
This commit is contained in:
Linus Torvalds
2012-08-02 11:34:40 -07:00
parent c8924234bd d9f691c365
commit 25aa6a7ae4
5 changed files with 150 additions and 22 deletions
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107
drivers/md/raid5.c
View File

@@ -484,7 +484,8 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
} else {
if (atomic_read(&sh->count)) {
BUG_ON(!list_empty(&sh->lru)
&& !test_bit(STRIPE_EXPANDING, &sh->state));
&& !test_bit(STRIPE_EXPANDING, &sh->state)
&& !test_bit(STRIPE_ON_UNPLUG_LIST, &sh->state));
} else {
if (!test_bit(STRIPE_HANDLE, &sh->state))
atomic_inc(&conf->active_stripes);
@@ -4010,6 +4011,62 @@ static struct stripe_head *__get_priority_stripe(struct r5conf *conf)
return sh;
}
struct raid5_plug_cb {
struct blk_plug_cb cb;
struct list_head list;
};
static void raid5_unplug(struct blk_plug_cb *blk_cb, bool from_schedule)
{
struct raid5_plug_cb *cb = container_of(
blk_cb, struct raid5_plug_cb, cb);
struct stripe_head *sh;
struct mddev *mddev = cb->cb.data;
struct r5conf *conf = mddev->private;
if (cb->list.next && !list_empty(&cb->list)) {
spin_lock_irq(&conf->device_lock);
while (!list_empty(&cb->list)) {
sh = list_first_entry(&cb->list, struct stripe_head, lru);
list_del_init(&sh->lru);
/*
* avoid race release_stripe_plug() sees
* STRIPE_ON_UNPLUG_LIST clear but the stripe
* is still in our list
*/
smp_mb__before_clear_bit();
clear_bit(STRIPE_ON_UNPLUG_LIST, &sh->state);
__release_stripe(conf, sh);
}
spin_unlock_irq(&conf->device_lock);
}
kfree(cb);
}
static void release_stripe_plug(struct mddev *mddev,
struct stripe_head *sh)
{
struct blk_plug_cb *blk_cb = blk_check_plugged(
raid5_unplug, mddev,
sizeof(struct raid5_plug_cb));
struct raid5_plug_cb *cb;
if (!blk_cb) {
release_stripe(sh);
return;
}
cb = container_of(blk_cb, struct raid5_plug_cb, cb);
if (cb->list.next == NULL)
INIT_LIST_HEAD(&cb->list);
if (!test_and_set_bit(STRIPE_ON_UNPLUG_LIST, &sh->state))
list_add_tail(&sh->lru, &cb->list);
else
release_stripe(sh);
}
static void make_request(struct mddev *mddev, struct bio * bi)
{
struct r5conf *conf = mddev->private;
@@ -4138,8 +4195,7 @@ static void make_request(struct mddev *mddev, struct bio * bi)
if ((bi->bi_rw & REQ_NOIDLE) &&
!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
atomic_inc(&conf->preread_active_stripes);
mddev_check_plugged(mddev);
release_stripe(sh);
release_stripe_plug(mddev, sh);
} else {
/* cannot get stripe for read-ahead, just give-up */
clear_bit(BIO_UPTODATE, &bi->bi_flags);
@@ -4537,6 +4593,30 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
return handled;
}
#define MAX_STRIPE_BATCH 8
static int handle_active_stripes(struct r5conf *conf)
{
struct stripe_head *batch[MAX_STRIPE_BATCH], *sh;
int i, batch_size = 0;
while (batch_size < MAX_STRIPE_BATCH &&
(sh = __get_priority_stripe(conf)) != NULL)
batch[batch_size++] = sh;
if (batch_size == 0)
return batch_size;
spin_unlock_irq(&conf->device_lock);
for (i = 0; i < batch_size; i++)
handle_stripe(batch[i]);
cond_resched();
spin_lock_irq(&conf->device_lock);
for (i = 0; i < batch_size; i++)
__release_stripe(conf, batch[i]);
return batch_size;
}
/*
* This is our raid5 kernel thread.
@@ -4547,7 +4627,6 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio)
*/
static void raid5d(struct mddev *mddev)
{
struct stripe_head *sh;
struct r5conf *conf = mddev->private;
int handled;
struct blk_plug plug;
@@ -4561,6 +4640,7 @@ static void raid5d(struct mddev *mddev)
spin_lock_irq(&conf->device_lock);
while (1) {
struct bio *bio;
int batch_size;
if (
!list_empty(&conf->bitmap_list)) {
@@ -4584,21 +4664,16 @@ static void raid5d(struct mddev *mddev)
handled++;
}
sh = __get_priority_stripe(conf);
if (!sh)
batch_size = handle_active_stripes(conf);
if (!batch_size)
break;
spin_unlock_irq(&conf->device_lock);
handled++;
handle_stripe(sh);
release_stripe(sh);
cond_resched();
handled += batch_size;
if (mddev->flags & ~(1<<MD_CHANGE_PENDING))
if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) {
spin_unlock_irq(&conf->device_lock);
md_check_recovery(mddev);
spin_lock_irq(&conf->device_lock);
spin_lock_irq(&conf->device_lock);
}
}
pr_debug("%d stripes handled\n", handled);