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From: Jens Axboe <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>
Subject: [PATCH 01/33] io-wq: wait for worker startup when forking a new one
Date: Wed,  3 Mar 2021 17:26:28 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

We need to have our worker count updated before continuing, to avoid
cases where we repeatedly think we need a new worker, but a fork is
already in progress.

Signed-off-by: Jens Axboe <[email protected]>
---
 fs/io-wq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 44e20248805a..965022fe9961 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -56,6 +56,7 @@ struct io_worker {
 	const struct cred *saved_creds;
 
 	struct completion ref_done;
+	struct completion started;
 
 	struct rcu_head rcu;
 };
@@ -267,6 +268,7 @@ static void io_worker_start(struct io_worker *worker)
 {
 	worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING);
 	io_wqe_inc_running(worker);
+	complete(&worker->started);
 }
 
 /*
@@ -644,6 +646,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
 	worker->wqe = wqe;
 	spin_lock_init(&worker->lock);
 	init_completion(&worker->ref_done);
+	init_completion(&worker->started);
 
 	refcount_inc(&wq->refs);
 
@@ -656,6 +659,7 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
 		kfree(worker);
 		return false;
 	}
+	wait_for_completion(&worker->started);
 	return true;
 }
 
-- 
2.30.1


  reply	other threads:[~2021-03-04  1:10 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-04  0:26 [PATCHSET 0/33] Fixes queued up for 5.12 Jens Axboe
2021-03-04  0:26 ` Jens Axboe [this message]
2021-03-04  0:26 ` [PATCH 02/33] io-wq: have manager wait for all workers to exit Jens Axboe
2021-03-04  0:26 ` [PATCH 03/33] io-wq: don't ask for a new worker if we're exiting Jens Axboe
2021-03-04  0:26 ` [PATCH 04/33] io-wq: rename wq->done completion to wq->started Jens Axboe
2021-03-04  0:26 ` [PATCH 05/33] io-wq: wait for manager exit on wq destroy Jens Axboe
2021-03-04  0:26 ` [PATCH 06/33] io-wq: fix double put of 'wq' in error path Jens Axboe
2021-03-04  0:26 ` [PATCH 07/33] io_uring: SQPOLL stop error handling fixes Jens Axboe
2021-03-04  0:26 ` [PATCH 08/33] io_uring: run fallback on cancellation Jens Axboe
2021-03-04  0:26 ` [PATCH 09/33] io_uring: don't use complete_all() on SQPOLL thread exit Jens Axboe
2021-03-04  0:26 ` [PATCH 10/33] io-wq: provide an io_wq_put_and_exit() helper Jens Axboe
2021-03-04  0:26 ` [PATCH 11/33] io_uring: fix race condition in task_work add and clear Jens Axboe
2021-03-04  0:26 ` [PATCH 12/33] io_uring: signal worker thread unshare Jens Axboe
2021-03-04 12:15   ` Stefan Metzmacher
2021-03-04 14:05     ` Jens Axboe
2021-03-04  0:26 ` [PATCH 13/33] io_uring: warn on not destroyed io-wq Jens Axboe
2021-03-04  0:26 ` [PATCH 14/33] io_uring: destroy io-wq on exec Jens Axboe
2021-03-04  0:26 ` [PATCH 15/33] io_uring: remove unused argument 'tsk' from io_req_caches_free() Jens Axboe
2021-03-04  0:26 ` [PATCH 16/33] io_uring: kill unnecessary REQ_F_WORK_INITIALIZED checks Jens Axboe
2021-03-04  0:26 ` [PATCH 17/33] io_uring: move cred assignment into io_issue_sqe() Jens Axboe
2021-03-04  0:26 ` [PATCH 18/33] io_uring: kill unnecessary io_run_ctx_fallback() in io_ring_exit_work() Jens Axboe
2021-03-04  0:26 ` [PATCH 19/33] io_uring: kill io_uring_flush() Jens Axboe
2021-03-04  0:26 ` [PATCH 20/33] io_uring: fix __tctx_task_work() ctx race Jens Axboe
2021-03-04  0:26 ` [PATCH 21/33] io_uring: replace cmpxchg in fallback with xchg Jens Axboe
2021-03-04  0:26 ` [PATCH 22/33] io_uring: ensure that SQPOLL thread is started for exit Jens Axboe
2021-03-04  0:26 ` [PATCH 23/33] io_uring: ignore double poll add on the same waitqueue head Jens Axboe
2021-03-04  0:26 ` [PATCH 24/33] io_uring: kill sqo_dead and sqo submission halting Jens Axboe
2021-03-04  0:26 ` [PATCH 25/33] io_uring: remove sqo_task Jens Axboe
2021-03-04  0:26 ` [PATCH 26/33] io-wq: fix error path leak of buffered write hash map Jens Axboe
2021-03-04  0:26 ` [PATCH 27/33] io_uring: fix -EAGAIN retry with IOPOLL Jens Axboe
2021-03-04  0:26 ` [PATCH 28/33] io_uring: choose right tctx->io_wq for try cancel Jens Axboe
2021-03-04  0:26 ` [PATCH 29/33] io_uring: inline io_req_clean_work() Jens Axboe
2021-03-04  0:26 ` [PATCH 30/33] io_uring: inline __io_queue_async_work() Jens Axboe
2021-03-04  0:26 ` [PATCH 31/33] io_uring: remove extra in_idle wake up Jens Axboe
2021-03-04  0:26 ` [PATCH 32/33] io_uring: ensure that threads freeze on suspend Jens Axboe
2021-03-04  0:27 ` [PATCH 33/33] io-wq: ensure all pending work is canceled on exit Jens Axboe

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