From f2cf11492b8b30d89b2fbf525c9ea5e8c4ccc842 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Sun, 22 Mar 2020 19:14:26 +0300 Subject: io-wq: close cancel gap for hashed linked work After io_assign_current_work() of a linked work, it can be decided to offloaded to another thread so doing io_wqe_enqueue(). However, until next io_assign_current_work() it can be cancelled, that isn't handled. Don't assign it, if it's not going to be executed. Fixes: 60cf46ae6054 ("io-wq: hash dependent work") Signed-off-by: Pavel Begunkov Signed-off-by: Jens Axboe --- fs/io-wq.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'fs/io-wq.c') diff --git a/fs/io-wq.c b/fs/io-wq.c index 9541df2729de..b3fb61ec0870 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -485,7 +485,7 @@ static void io_worker_handle_work(struct io_worker *worker) struct io_wq *wq = wqe->wq; do { - struct io_wq_work *work; + struct io_wq_work *work, *assign_work; unsigned int hash; get_next: /* @@ -522,10 +522,14 @@ get_next: hash = io_get_work_hash(work); work->func(&work); work = (old_work == work) ? NULL : work; - io_assign_current_work(worker, work); + + assign_work = work; + if (work && io_wq_is_hashed(work)) + assign_work = NULL; + io_assign_current_work(worker, assign_work); wq->free_work(old_work); - if (work && io_wq_is_hashed(work)) { + if (work && !assign_work) { io_wqe_enqueue(wqe, work); work = NULL; } -- cgit v1.2.3-59-g8ed1b