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Btrfs: Catch missed bios in the async bio submission thread

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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
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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; struct btrfs_worker_thread *worker = work->worker;
unsigned long flags; unsigned long flags;
int wake = 0;
if (test_and_set_bit(WORK_QUEUED_BIT, &work->flags)) if (test_and_set_bit(WORK_QUEUED_BIT, &work->flags))
goto out; goto out;
@ -367,10 +368,16 @@ int btrfs_requeue_work(struct btrfs_work *work)
&worker->workers->worker_list); &worker->workers->worker_list);
spin_unlock_irqrestore(&worker->workers->lock, flags); spin_unlock_irqrestore(&worker->workers->lock, flags);
} }
if (!worker->working) {
wake = 1;
worker->working = 1;
}
spin_unlock_irqrestore(&worker->lock, flags); spin_unlock_irqrestore(&worker->lock, flags);
if (wake)
wake_up_process(worker->task);
out: out:
return 0; return 0;
} }
@ -397,6 +404,7 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
} }
spin_lock_irqsave(&worker->lock, flags); spin_lock_irqsave(&worker->lock, flags);
atomic_inc(&worker->num_pending); atomic_inc(&worker->num_pending);
check_busy_worker(worker); check_busy_worker(worker);
list_add_tail(&work->list, &worker->pending); 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: loop:
spin_lock(&device->io_lock); spin_lock(&device->io_lock);
loop_lock:
/* take all the bios off the list at once and process them /* take all the bios off the list at once and process them
* later on (without the lock held). But, remember the * later on (without the lock held). But, remember the
* tail and other pointers so the bios can be properly reinserted * tail and other pointers so the bios can be properly reinserted
@ -203,7 +204,7 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
* is now congested. Back off and let other work structs * is now congested. Back off and let other work structs
* run instead * run instead
*/ */
if (pending && bdi_write_congested(bdi) && if (pending && bdi_write_congested(bdi) && num_run > 16 &&
fs_info->fs_devices->open_devices > 1) { fs_info->fs_devices->open_devices > 1) {
struct bio *old_head; struct bio *old_head;
@ -215,7 +216,8 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
tail->bi_next = old_head; tail->bi_next = old_head;
else else
device->pending_bio_tail = tail; device->pending_bio_tail = tail;
device->running_pending = 0;
device->running_pending = 1;
spin_unlock(&device->io_lock); spin_unlock(&device->io_lock);
btrfs_requeue_work(&device->work); btrfs_requeue_work(&device->work);
@ -224,6 +226,11 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
} }
if (again) if (again)
goto loop; goto loop;
spin_lock(&device->io_lock);
if (device->pending_bios)
goto loop_lock;
spin_unlock(&device->io_lock);
done: done:
return 0; return 0;
} }