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io-wq: add support for uncancellable work

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Not all work can be cancelled, some of it we may need to guarantee
that it runs to completion. Allow the caller to set IO_WQ_WORK_NO_CANCEL
on work that must not be cancelled. Note that the caller work function
must also check for IO_WQ_WORK_NO_CANCEL on work that is marked
IO_WQ_WORK_CANCEL.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-12-11 19:29:43 -07:00
parent 6e802a4ba0
commit 0c9d5ccd26
3 changed files with 12 additions and 2 deletions
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5
fs/io_uring.c
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@@ -3460,8 +3460,11 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
struct io_kiocb *nxt = NULL;
int ret = 0;
if (work->flags & IO_WQ_WORK_CANCEL)
/* if NO_CANCEL is set, we must still run the work */
if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) ==
IO_WQ_WORK_CANCEL) {
ret = -ECANCELED;
}
if (!ret) {
req->has_user = (work->flags & IO_WQ_WORK_HAS_MM) != 0;