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io-wq: cancel work if we fail getting a mm reference 

If we require mm and user context, mark the request for cancellation
if we fail to acquire the desired mm.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-01-14 22:06:11 -07:00
parent 74566df3a7
commit e0bbb3461a
1 changed files with 8 additions and 4 deletions
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6
fs/io-wq.c
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@ -445,10 +445,14 @@ next:
task_unlock(current); task_unlock(current);
} }
if ((work->flags & IO_WQ_WORK_NEEDS_USER) && !worker->mm && if ((work->flags & IO_WQ_WORK_NEEDS_USER) && !worker->mm &&
wq->mm && mmget_not_zero(wq->mm)) { wq->mm) {
if (mmget_not_zero(wq->mm)) {
use_mm(wq->mm); use_mm(wq->mm);
set_fs(USER_DS); set_fs(USER_DS);
worker->mm = wq->mm; worker->mm = wq->mm;
} else {
work->flags |= IO_WQ_WORK_CANCEL;
}
} }
if (!worker->creds) if (!worker->creds)
worker->creds = override_creds(wq->creds); worker->creds = override_creds(wq->creds);