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Btrfs: Catch missed bios in the async bio submission thread 

The async bio submission thread was missing some bios that were
added after it had decided there was no work left to do.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-02-04 09:19:41 -05:00
parent 89f135d8b5
commit a683705153
2 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/btrfs/async-thread.c
View File

@ -349,6 +349,7 @@ int btrfs_requeue_work(struct btrfs_work *work)
{
struct btrfs_worker_thread *worker = work->worker;
unsigned long flags;
int wake = 0;
if (test_and_set_bit(WORK_QUEUED_BIT, &work->flags))
goto out;
@ -367,10 +368,16 @@ int btrfs_requeue_work(struct btrfs_work *work)
&worker->workers->worker_list);
spin_unlock_irqrestore(&worker->workers->lock, flags);
}
if (!worker->working) {
wake = 1;
worker->working = 1;
}
spin_unlock_irqrestore(&worker->lock, flags);
if (wake)
wake_up_process(worker->task);
out:
return 0;
}
@ -397,6 +404,7 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
}
spin_lock_irqsave(&worker->lock, flags);
atomic_inc(&worker->num_pending);
check_busy_worker(worker);
list_add_tail(&work->list, &worker->pending);

11
fs/btrfs/volumes.c
View File

@ -154,6 +154,7 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
loop:
spin_lock(&device->io_lock);
loop_lock:
/* take all the bios off the list at once and process them
* later on (without the lock held). But, remember the
* tail and other pointers so the bios can be properly reinserted
@ -203,7 +204,7 @@ loop:
* is now congested. Back off and let other work structs
* run instead
*/
if (pending && bdi_write_congested(bdi) &&
if (pending && bdi_write_congested(bdi) && num_run > 16 &&
fs_info->fs_devices->open_devices > 1) {
struct bio *old_head;
@ -215,7 +216,8 @@ loop:
tail->bi_next = old_head;
else
device->pending_bio_tail = tail;
device->running_pending = 0;
device->running_pending = 1;
spin_unlock(&device->io_lock);
btrfs_requeue_work(&device->work);
@ -224,6 +226,11 @@ loop:
}
if (again)
goto loop;
spin_lock(&device->io_lock);
if (device->pending_bios)
goto loop_lock;
spin_unlock(&device->io_lock);
done:
return 0;
}