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io-wq: cancel task_work on exit only targeting the current 'wq' 

With using task_work_cancel(), we're potentially canceling task_work
that isn't related to this specific io_wq. Use the newly added
task_work_cancel_match() to ensure that we only remove and cancel work
items that are specific to this io_wq.

Fixes: 685fe7feed ("io-wq: eliminate the need for a manager thread")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-04-01 19:57:07 -06:00
parent c7aab1a7c5
commit c80ca4707d
1 changed files with 11 additions and 1 deletions
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12
fs/io-wq.c
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@ -986,6 +986,16 @@ err_wq:
return ERR_PTR(ret);
}
static bool io_task_work_match(struct callback_head *cb, void *data)
{
struct create_worker_data *cwd;
if (cb->func != create_worker_cb)
return false;
cwd = container_of(cb, struct create_worker_data, work);
return cwd->wqe->wq == data;
}
static void io_wq_exit_workers(struct io_wq *wq)
{
struct callback_head *cb;
@ -996,7 +1006,7 @@ static void io_wq_exit_workers(struct io_wq *wq)
if (!wq->task)
return;
while ((cb = task_work_cancel(wq->task, create_worker_cb)) != NULL) {
while ((cb = task_work_cancel_match(wq->task, io_task_work_match, wq)) != NULL) {
struct create_worker_data *cwd;
cwd = container_of(cb, struct create_worker_data, work);