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io-wq: shuffle io_worker_handle_work() code 

This is a preparation patch, it adds some helpers and makes
the next patches cleaner.

- extract io_impersonate_work() and io_assign_current_work()
- replace @next label with nested do-while
- move put_work() right after NULL'ing cur_work.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-03-04 16:14:09 +03:00 committed by Jens Axboe
parent 7a743e225b
commit dc026a73c7
1 changed files with 59 additions and 54 deletions
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85
fs/io-wq.c
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@ -440,14 +440,43 @@ static void io_wq_switch_creds(struct io_worker *worker,
worker->saved_creds = old_creds;
}
static void io_impersonate_work(struct io_worker *worker,
struct io_wq_work *work)
{
if (work->files && current->files != work->files) {
task_lock(current);
current->files = work->files;
task_unlock(current);
}
if (work->fs && current->fs != work->fs)
current->fs = work->fs;
if (work->mm != worker->mm)
io_wq_switch_mm(worker, work);
if (worker->cur_creds != work->creds)
io_wq_switch_creds(worker, work);
}
static void io_assign_current_work(struct io_worker *worker,
struct io_wq_work *work)
{
/* flush pending signals before assigning new work */
if (signal_pending(current))
flush_signals(current);
cond_resched();
spin_lock_irq(&worker->lock);
worker->cur_work = work;
spin_unlock_irq(&worker->lock);
}
static void io_worker_handle_work(struct io_worker *worker)
__releases(wqe->lock)
{
struct io_wq_work *work, *old_work = NULL, *put_work = NULL;
struct io_wqe *wqe = worker->wqe;
struct io_wq *wq = wqe->wq;
do {
struct io_wq_work *work, *old_work;
unsigned hash = -1U;
/*
@ -464,43 +493,23 @@ static void io_worker_handle_work(struct io_worker *worker)
wqe->flags |= IO_WQE_FLAG_STALLED;
spin_unlock_irq(&wqe->lock);
if (put_work && wq->put_work)
wq->put_work(old_work);
if (!work)
break;
next:
/* flush any pending signals before assigning new work */
if (signal_pending(current))
flush_signals(current);
cond_resched();
/* handle a whole dependent link */
do {
io_assign_current_work(worker, work);
io_impersonate_work(worker, work);
spin_lock_irq(&worker->lock);
worker->cur_work = work;
spin_unlock_irq(&worker->lock);
if (work->files && current->files != work->files) {
task_lock(current);
current->files = work->files;
task_unlock(current);
}
if (work->fs && current->fs != work->fs)
current->fs = work->fs;
if (work->mm != worker->mm)
io_wq_switch_mm(worker, work);
if (worker->cur_creds != work->creds)
io_wq_switch_creds(worker, work);
/*
* OK to set IO_WQ_WORK_CANCEL even for uncancellable work,
* the worker function will do the right thing.
* OK to set IO_WQ_WORK_CANCEL even for uncancellable
* work, the worker function will do the right thing.
*/
if (test_bit(IO_WQ_BIT_CANCEL, &wq->state))
work->flags |= IO_WQ_WORK_CANCEL;
if (wq->get_work) {
put_work = work;
if (wq->get_work)
wq->get_work(work);
}
old_work = work;
work->func(&work);
@ -509,24 +518,20 @@ next:
worker->cur_work = NULL;
spin_unlock_irq(&worker->lock);
spin_lock_irq(&wqe->lock);
if (wq->put_work)
wq->put_work(old_work);
if (hash != -1U) {
wqe->hash_map &= ~BIT(hash);
spin_lock_irq(&wqe->lock);
wqe->hash_map &= ~BIT_ULL(hash);
wqe->flags &= ~IO_WQE_FLAG_STALLED;
}
if (work && work != old_work) {
spin_unlock_irq(&wqe->lock);
if (put_work && wq->put_work) {
wq->put_work(put_work);
put_work = NULL;
}
/* dependent work not hashed */
/* dependent work is not hashed */
hash = -1U;
goto next;
}
} while (work && work != old_work);
spin_lock_irq(&wqe->lock);
} while (1);
}