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Merge branch 'for-chris' of http://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-work into integration

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Conflicts:
	fs/btrfs/inode.c

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2011-12-15 13:43:49 -05:00
commit 567a45e917
11 changed files with 212 additions and 118 deletions
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117
fs/btrfs/async-thread.c
View file

@ -64,6 +64,8 @@ struct btrfs_worker_thread {
int idle;
};
static int __btrfs_start_workers(struct btrfs_workers *workers);
/*
* btrfs_start_workers uses kthread_run, which can block waiting for memory
* for a very long time. It will actually throttle on page writeback,
@ -88,27 +90,10 @@ static void start_new_worker_func(struct btrfs_work *work)
{
struct worker_start *start;
start = container_of(work, struct worker_start, work);
btrfs_start_workers(start->queue, 1);
__btrfs_start_workers(start->queue);
kfree(start);
}
static int start_new_worker(struct btrfs_workers *queue)
{
struct worker_start *start;
int ret;
start = kzalloc(sizeof(*start), GFP_NOFS);
if (!start)
return -ENOMEM;
start->work.func = start_new_worker_func;
start->queue = queue;
ret = btrfs_queue_worker(queue->atomic_worker_start, &start->work);
if (ret)
kfree(start);
return ret;
}
/*
* helper function to move a thread onto the idle list after it
* has finished some requests.
@ -153,12 +138,20 @@ static void check_busy_worker(struct btrfs_worker_thread *worker)
static void check_pending_worker_creates(struct btrfs_worker_thread *worker)
{
struct btrfs_workers *workers = worker->workers;
struct worker_start *start;
unsigned long flags;
rmb();
if (!workers->atomic_start_pending)
return;
start = kzalloc(sizeof(*start), GFP_NOFS);
if (!start)
return;
start->work.func = start_new_worker_func;
start->queue = workers;
spin_lock_irqsave(&workers->lock, flags);
if (!workers->atomic_start_pending)
goto out;
@ -170,10 +163,11 @@ static void check_pending_worker_creates(struct btrfs_worker_thread *worker)
workers->num_workers_starting += 1;
spin_unlock_irqrestore(&workers->lock, flags);
start_new_worker(workers);
btrfs_queue_worker(workers->atomic_worker_start, &start->work);
return;
out:
kfree(start);
spin_unlock_irqrestore(&workers->lock, flags);
}
@ -462,56 +456,55 @@ void btrfs_init_workers(struct btrfs_workers *workers, char *name, int max,
* starts new worker threads. This does not enforce the max worker
* count in case you need to temporarily go past it.
*/
static int __btrfs_start_workers(struct btrfs_workers *workers,
int num_workers)
static int __btrfs_start_workers(struct btrfs_workers *workers)
{
struct btrfs_worker_thread *worker;
int ret = 0;
int i;
for (i = 0; i < num_workers; i++) {
worker = kzalloc(sizeof(*worker), GFP_NOFS);
if (!worker) {
ret = -ENOMEM;
goto fail;
}
INIT_LIST_HEAD(&worker->pending);
INIT_LIST_HEAD(&worker->prio_pending);
INIT_LIST_HEAD(&worker->worker_list);
spin_lock_init(&worker->lock);
atomic_set(&worker->num_pending, 0);
atomic_set(&worker->refs, 1);
worker->workers = workers;
worker->task = kthread_run(worker_loop, worker,
"btrfs-%s-%d", workers->name,
workers->num_workers + i);
if (IS_ERR(worker->task)) {
ret = PTR_ERR(worker->task);
kfree(worker);
goto fail;
}
spin_lock_irq(&workers->lock);
list_add_tail(&worker->worker_list, &workers->idle_list);
worker->idle = 1;
workers->num_workers++;
workers->num_workers_starting--;
WARN_ON(workers->num_workers_starting < 0);
spin_unlock_irq(&workers->lock);
worker = kzalloc(sizeof(*worker), GFP_NOFS);
if (!worker) {
ret = -ENOMEM;
goto fail;
}
INIT_LIST_HEAD(&worker->pending);
INIT_LIST_HEAD(&worker->prio_pending);
INIT_LIST_HEAD(&worker->worker_list);
spin_lock_init(&worker->lock);
atomic_set(&worker->num_pending, 0);
atomic_set(&worker->refs, 1);
worker->workers = workers;
worker->task = kthread_run(worker_loop, worker,
"btrfs-%s-%d", workers->name,
workers->num_workers + 1);
if (IS_ERR(worker->task)) {
ret = PTR_ERR(worker->task);
kfree(worker);
goto fail;
}
spin_lock_irq(&workers->lock);
list_add_tail(&worker->worker_list, &workers->idle_list);
worker->idle = 1;
workers->num_workers++;
workers->num_workers_starting--;
WARN_ON(workers->num_workers_starting < 0);
spin_unlock_irq(&workers->lock);
return 0;
fail:
btrfs_stop_workers(workers);
spin_lock_irq(&workers->lock);
workers->num_workers_starting--;
spin_unlock_irq(&workers->lock);
return ret;
}
int btrfs_start_workers(struct btrfs_workers *workers, int num_workers)
int btrfs_start_workers(struct btrfs_workers *workers)
{
spin_lock_irq(&workers->lock);
workers->num_workers_starting += num_workers;
workers->num_workers_starting++;
spin_unlock_irq(&workers->lock);
return __btrfs_start_workers(workers, num_workers);
return __btrfs_start_workers(workers);
}
/*
@ -568,6 +561,7 @@ static struct btrfs_worker_thread *find_worker(struct btrfs_workers *workers)
struct btrfs_worker_thread *worker;
unsigned long flags;
struct list_head *fallback;
int ret;
again:
spin_lock_irqsave(&workers->lock, flags);
@ -584,7 +578,9 @@ again:
workers->num_workers_starting++;
spin_unlock_irqrestore(&workers->lock, flags);
/* we're below the limit, start another worker */
__btrfs_start_workers(workers, 1);
ret = __btrfs_start_workers(workers);
if (ret)
goto fallback;
goto again;
}
}
@ -665,7 +661,7 @@ void btrfs_set_work_high_prio(struct btrfs_work *work)
/*
* places a struct btrfs_work into the pending queue of one of the kthreads
*/
int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
void btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
{
struct btrfs_worker_thread *worker;
unsigned long flags;
@ -673,7 +669,7 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
/* don't requeue something already on a list */
if (test_and_set_bit(WORK_QUEUED_BIT, &work->flags))
goto out;
return;
worker = find_worker(workers);
if (workers->ordered) {
@ -712,7 +708,4 @@ int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work)
if (wake)
wake_up_process(worker->task);
spin_unlock_irqrestore(&worker->lock, flags);
out:
return 0;
}