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io-wq: fix bug of creating io-wokers unconditionally 

The former patch to add check between nr_workers and max_workers has a
bug, which will cause unconditionally creating io-workers. That's
because the result of the check doesn't affect the call of
create_io_worker(), fix it by bringing in a boolean value for it.

Fixes: 21698274da ("io-wq: fix lack of acct->nr_workers < acct->max_workers judgement")
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210808135434.68667-2-haoxu@linux.alibaba.com
[axboe: drop hunk that isn't strictly needed]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hao Xu 2021-08-08 21:54:33 +08:00 committed by Jens Axboe
parent 4956b9eaad
commit 49e7f0c789
1 changed files with 10 additions and 2 deletions
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12
fs/io-wq.c
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@ -282,16 +282,24 @@ static void create_worker_cb(struct callback_head *cb)
struct io_wq *wq;
struct io_wqe *wqe;
struct io_wqe_acct *acct;
bool do_create = false;
cwd = container_of(cb, struct create_worker_data, work);
wqe = cwd->wqe;
wq = wqe->wq;
acct = &wqe->acct[cwd->index];
raw_spin_lock_irq(&wqe->lock);
if (acct->nr_workers < acct->max_workers)
if (acct->nr_workers < acct->max_workers) {
acct->nr_workers++;
do_create = true;
}
raw_spin_unlock_irq(&wqe->lock);
create_io_worker(wq, cwd->wqe, cwd->index);
if (do_create) {
create_io_worker(wq, cwd->wqe, cwd->index);
} else {
atomic_dec(&acct->nr_running);
io_worker_ref_put(wq);
}
kfree(cwd);
}