From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 15 Jan 2020 05:06:11 +0000 (-0700)
Subject: io-wq: cancel work if we fail getting a mm reference
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e0bbb3461ae000baec13e8ec5b5063202df228df;p=linux.git

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>
---

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 541c8a3e0bbb5..5147d2213b019 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -445,10 +445,14 @@ next:
 			task_unlock(current);
 		}
 		if ((work->flags & IO_WQ_WORK_NEEDS_USER) && !worker->mm &&
-		    wq->mm && mmget_not_zero(wq->mm)) {
-			use_mm(wq->mm);
-			set_fs(USER_DS);
-			worker->mm = wq->mm;
+		    wq->mm) {
+			if (mmget_not_zero(wq->mm)) {
+				use_mm(wq->mm);
+				set_fs(USER_DS);
+				worker->mm = wq->mm;
+			} else {
+				work->flags |= IO_WQ_WORK_CANCEL;
+			}
 		}
 		if (!worker->creds)
 			worker->creds = override_creds(wq->creds);