return 0;
}
rcu_read_lock();
- if (mddev->suspended || mddev->barrier) {
+ if (mddev->suspended) {
DEFINE_WAIT(__wait);
for (;;) {
prepare_to_wait(&mddev->sb_wait, &__wait,
TASK_UNINTERRUPTIBLE);
- if (!mddev->suspended && !mddev->barrier)
+ if (!mddev->suspended)
break;
rcu_read_unlock();
schedule();
int mddev_congested(mddev_t *mddev, int bits)
{
- if (mddev->barrier)
- return 1;
return mddev->suspended;
}
EXPORT_SYMBOL(mddev_congested);
/*
- * Generic barrier handling for md
+ * Generic flush handling for md
*/
-#define POST_REQUEST_BARRIER ((void*)1)
-
-static void md_end_barrier(struct bio *bio, int err)
+static void md_end_flush(struct bio *bio, int err)
{
mdk_rdev_t *rdev = bio->bi_private;
mddev_t *mddev = rdev->mddev;
- if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER)
- set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags);
rdev_dec_pending(rdev, mddev);
if (atomic_dec_and_test(&mddev->flush_pending)) {
- if (mddev->barrier == POST_REQUEST_BARRIER) {
- /* This was a post-request barrier */
- mddev->barrier = NULL;
- wake_up(&mddev->sb_wait);
- } else
- /* The pre-request barrier has finished */
- schedule_work(&mddev->barrier_work);
+ /* The pre-request flush has finished */
+ schedule_work(&mddev->flush_work);
}
bio_put(bio);
}
-static void submit_barriers(mddev_t *mddev)
+static void submit_flushes(mddev_t *mddev)
{
mdk_rdev_t *rdev;
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
bi = bio_alloc(GFP_KERNEL, 0);
- bi->bi_end_io = md_end_barrier;
+ bi->bi_end_io = md_end_flush;
bi->bi_private = rdev;
bi->bi_bdev = rdev->bdev;
atomic_inc(&mddev->flush_pending);
- submit_bio(WRITE_BARRIER, bi);
+ submit_bio(WRITE_FLUSH, bi);
rcu_read_lock();
rdev_dec_pending(rdev, mddev);
}
rcu_read_unlock();
}
-static void md_submit_barrier(struct work_struct *ws)
+static void md_submit_flush_data(struct work_struct *ws)
{
- mddev_t *mddev = container_of(ws, mddev_t, barrier_work);
- struct bio *bio = mddev->barrier;
+ mddev_t *mddev = container_of(ws, mddev_t, flush_work);
+ struct bio *bio = mddev->flush_bio;
atomic_set(&mddev->flush_pending, 1);
- if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags))
- bio_endio(bio, -EOPNOTSUPP);
- else if (bio->bi_size == 0)
+ if (bio->bi_size == 0)
/* an empty barrier - all done */
bio_endio(bio, 0);
else {
- bio->bi_rw &= ~REQ_HARDBARRIER;
+ bio->bi_rw &= ~REQ_FLUSH;
if (mddev->pers->make_request(mddev, bio))
generic_make_request(bio);
- mddev->barrier = POST_REQUEST_BARRIER;
- submit_barriers(mddev);
}
if (atomic_dec_and_test(&mddev->flush_pending)) {
- mddev->barrier = NULL;
+ mddev->flush_bio = NULL;
wake_up(&mddev->sb_wait);
}
}
-void md_barrier_request(mddev_t *mddev, struct bio *bio)
+void md_flush_request(mddev_t *mddev, struct bio *bio)
{
spin_lock_irq(&mddev->write_lock);
wait_event_lock_irq(mddev->sb_wait,
- !mddev->barrier,
+ !mddev->flush_bio,
mddev->write_lock, /*nothing*/);
- mddev->barrier = bio;
+ mddev->flush_bio = bio;
spin_unlock_irq(&mddev->write_lock);
atomic_set(&mddev->flush_pending, 1);
- INIT_WORK(&mddev->barrier_work, md_submit_barrier);
+ INIT_WORK(&mddev->flush_work, md_submit_flush_data);
- submit_barriers(mddev);
+ submit_flushes(mddev);
if (atomic_dec_and_test(&mddev->flush_pending))
- schedule_work(&mddev->barrier_work);
+ schedule_work(&mddev->flush_work);
}
-EXPORT_SYMBOL(md_barrier_request);
+EXPORT_SYMBOL(md_flush_request);
/* Support for plugging.
* This mirrors the plugging support in request_queue, but does not
bio_put(bio);
}
-static void super_written_barrier(struct bio *bio, int error)
-{
- struct bio *bio2 = bio->bi_private;
- mdk_rdev_t *rdev = bio2->bi_private;
- mddev_t *mddev = rdev->mddev;
-
- if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
- error == -EOPNOTSUPP) {
- unsigned long flags;
- /* barriers don't appear to be supported :-( */
- set_bit(BarriersNotsupp, &rdev->flags);
- mddev->barriers_work = 0;
- spin_lock_irqsave(&mddev->write_lock, flags);
- bio2->bi_next = mddev->biolist;
- mddev->biolist = bio2;
- spin_unlock_irqrestore(&mddev->write_lock, flags);
- wake_up(&mddev->sb_wait);
- bio_put(bio);
- } else {
- bio_put(bio2);
- bio->bi_private = rdev;
- super_written(bio, error);
- }
-}
-
void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
sector_t sector, int size, struct page *page)
{
* and decrement it on completion, waking up sb_wait
* if zero is reached.
* If an error occurred, call md_error
- *
- * As we might need to resubmit the request if REQ_HARDBARRIER
- * causes ENOTSUPP, we allocate a spare bio...
*/
struct bio *bio = bio_alloc(GFP_NOIO, 1);
- int rw = REQ_WRITE | REQ_SYNC | REQ_UNPLUG;
bio->bi_bdev = rdev->bdev;
bio->bi_sector = sector;
bio_add_page(bio, page, size, 0);
bio->bi_private = rdev;
bio->bi_end_io = super_written;
- bio->bi_rw = rw;
atomic_inc(&mddev->pending_writes);
- if (!test_bit(BarriersNotsupp, &rdev->flags)) {
- struct bio *rbio;
- rw |= REQ_HARDBARRIER;
- rbio = bio_clone(bio, GFP_NOIO);
- rbio->bi_private = bio;
- rbio->bi_end_io = super_written_barrier;
- submit_bio(rw, rbio);
- } else
- submit_bio(rw, bio);
+ submit_bio(REQ_WRITE | REQ_SYNC | REQ_UNPLUG | REQ_FLUSH | REQ_FUA,
+ bio);
}
void md_super_wait(mddev_t *mddev)
{
- /* wait for all superblock writes that were scheduled to complete.
- * if any had to be retried (due to BARRIER problems), retry them
- */
+ /* wait for all superblock writes that were scheduled to complete */
DEFINE_WAIT(wq);
for(;;) {
prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
if (atomic_read(&mddev->pending_writes)==0)
break;
- while (mddev->biolist) {
- struct bio *bio;
- spin_lock_irq(&mddev->write_lock);
- bio = mddev->biolist;
- mddev->biolist = bio->bi_next ;
- bio->bi_next = NULL;
- spin_unlock_irq(&mddev->write_lock);
- submit_bio(bio->bi_rw, bio);
- }
schedule();
}
finish_wait(&mddev->sb_wait, &wq);
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
- clear_bit(BarriersNotsupp, &rdev->flags);
if (mddev->raid_disks == 0) {
mddev->major_version = 0;
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
- clear_bit(BarriersNotsupp, &rdev->flags);
if (mddev->raid_disks == 0) {
mddev->major_version = 1;
bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
if (rdev->sb_size & bmask)
rdev->sb_size = (rdev->sb_size | bmask) + 1;
- }
+ } else
+ max_dev = le32_to_cpu(sb->max_dev);
+
for (i=0; i<max_dev;i++)
sb->dev_roles[i] = cpu_to_le16(0xfffe);
/* may be over-ridden by personality */
mddev->resync_max_sectors = mddev->dev_sectors;
- mddev->barriers_work = 1;
mddev->ok_start_degraded = start_dirty_degraded;
if (start_readonly && mddev->ro == 0)
mddev->recovery = 0;
mddev->in_sync = 0;
mddev->degraded = 0;
- mddev->barriers_work = 0;
mddev->safemode = 0;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.default_offset = 0;
if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return;
if ( ! (
- (mddev->flags && !mddev->external) ||
+ (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
(mddev->external == 0 && mddev->safemode == 1) ||
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff