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OpenCloudOS-Kernel
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Merge branch 'for-linus' of git://neil.brown.name/md 

* 'for-linus' of git://neil.brown.name/md:
  md: protect against NULL reference when waiting to start a raid10.
  md: fix bug with re-adding of partially recovered device.
  md: fix possible deadlock in handling flush requests.
  md: move code in to submit_flushes.
  md: remove handling of flush_pending in md_submit_flush_data
This commit is contained in:
Linus Torvalds 2010-12-14 18:49:40 -08:00
parent 3d0b6087f3 589a594be1
commit 6d5e93c2aa
2 changed files with 21 additions and 20 deletions
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39
drivers/md/md.c
View File

@ -371,10 +371,15 @@ static void md_end_flush(struct bio *bio, int err)
bio_put(bio);
}
static void submit_flushes(mddev_t *mddev)
static void md_submit_flush_data(struct work_struct *ws);
static void submit_flushes(struct work_struct *ws)
{
mddev_t *mddev = container_of(ws, mddev_t, flush_work);
mdk_rdev_t *rdev;
INIT_WORK(&mddev->flush_work, md_submit_flush_data);
atomic_set(&mddev->flush_pending, 1);
rcu_read_lock();
list_for_each_entry_rcu(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= 0 &&
@ -397,6 +402,8 @@ static void submit_flushes(mddev_t *mddev)
rdev_dec_pending(rdev, mddev);
}
rcu_read_unlock();
if (atomic_dec_and_test(&mddev->flush_pending))
queue_work(md_wq, &mddev->flush_work);
}
static void md_submit_flush_data(struct work_struct *ws)
@ -404,8 +411,6 @@ static void md_submit_flush_data(struct work_struct *ws)
mddev_t *mddev = container_of(ws, mddev_t, flush_work);
struct bio *bio = mddev->flush_bio;
atomic_set(&mddev->flush_pending, 1);
if (bio->bi_size == 0)
/* an empty barrier - all done */
bio_endio(bio, 0);
@ -414,10 +419,9 @@ static void md_submit_flush_data(struct work_struct *ws)
if (mddev->pers->make_request(mddev, bio))
generic_make_request(bio);
}
if (atomic_dec_and_test(&mddev->flush_pending)) {
mddev->flush_bio = NULL;
wake_up(&mddev->sb_wait);
}
mddev->flush_bio = NULL;
wake_up(&mddev->sb_wait);
}
void md_flush_request(mddev_t *mddev, struct bio *bio)
@ -429,13 +433,8 @@ void md_flush_request(mddev_t *mddev, struct bio *bio)
mddev->flush_bio = bio;
spin_unlock_irq(&mddev->write_lock);
atomic_set(&mddev->flush_pending, 1);
INIT_WORK(&mddev->flush_work, md_submit_flush_data);
submit_flushes(mddev);
if (atomic_dec_and_test(&mddev->flush_pending))
queue_work(md_wq, &mddev->flush_work);
INIT_WORK(&mddev->flush_work, submit_flushes);
queue_work(md_wq, &mddev->flush_work);
}
EXPORT_SYMBOL(md_flush_request);
@ -5160,7 +5159,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
PTR_ERR(rdev));
return PTR_ERR(rdev);
}
/* set save_raid_disk if appropriate */
/* set saved_raid_disk if appropriate */
if (!mddev->persistent) {
if (info->state & (1<<MD_DISK_SYNC) &&
info->raid_disk < mddev->raid_disks)
@ -5170,7 +5169,10 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
} else
super_types[mddev->major_version].
validate_super(mddev, rdev);
rdev->saved_raid_disk = rdev->raid_disk;
if (test_bit(In_sync, &rdev->flags))
rdev->saved_raid_disk = rdev->raid_disk;
else
rdev->saved_raid_disk = -1;
clear_bit(In_sync, &rdev->flags); /* just to be sure */
if (info->state & (1<<MD_DISK_WRITEMOSTLY))
@ -6042,9 +6044,8 @@ static int md_thread(void * arg)
|| kthread_should_stop(),
thread->timeout);
clear_bit(THREAD_WAKEUP, &thread->flags);
thread->run(thread->mddev);
if (test_and_clear_bit(THREAD_WAKEUP, &thread->flags))
thread->run(thread->mddev);
}
return 0;

2
drivers/md/raid10.c
View File

@ -2397,13 +2397,13 @@ static int run(mddev_t *mddev)
return 0;
out_free_conf:
md_unregister_thread(mddev->thread);
if (conf->r10bio_pool)
mempool_destroy(conf->r10bio_pool);
safe_put_page(conf->tmppage);
kfree(conf->mirrors);
kfree(conf);
mddev->private = NULL;
md_unregister_thread(mddev->thread);
out:
return -EIO;
}