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io_uring: handle TIF_NOTIFY_RESUME when checking for task_work 

If TIF_NOTIFY_RESUME is set, then we need to call resume_user_mode_work()
for PF_IO_WORKER threads. They never return to usermode, hence never get
a chance to process any items that are marked by this flag. Most notably
this includes the final put of files, but also any throttling markers set
by block cgroups.

Cc: stable@vger.kernel.org # 5.10+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-01-24 08:24:25 -07:00
parent 8572df941c
commit b5d3ae202f
1 changed files with 8 additions and 0 deletions
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8
io_uring/io_uring.h
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@ -3,6 +3,7 @@
#include <linux/errno.h>
#include <linux/lockdep.h>
#include <linux/resume_user_mode.h>
#include <linux/io_uring_types.h>
#include <uapi/linux/eventpoll.h>
#include "io-wq.h"
@ -274,6 +275,13 @@ static inline int io_run_task_work(void)
*/
if (test_thread_flag(TIF_NOTIFY_SIGNAL))
clear_notify_signal();
/*
* PF_IO_WORKER never returns to userspace, so check here if we have
* notify work that needs processing.
*/
if (current->flags & PF_IO_WORKER &&
test_thread_flag(TIF_NOTIFY_RESUME))
resume_user_mode_work(NULL);
if (task_work_pending(current)) {
__set_current_state(TASK_RUNNING);
task_work_run();