From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 30 Oct 2020 15:36:41 +0000 (-0600)
Subject: io-wq: cancel request if it's asking for files and we don't have them
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3dd1680d1418f22f7ddaf98a4eab66285a099b3e;p=linux.git

io-wq: cancel request if it's asking for files and we don't have them

This can't currently happen, but will be possible shortly. Handle missing
files just like we do not being able to grab a needed mm, and mark the
request as needing cancelation.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 02894df7656dd..b53c055bea6a3 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -482,6 +482,10 @@ static void io_impersonate_work(struct io_worker *worker,
 		current->files = work->identity->files;
 		current->nsproxy = work->identity->nsproxy;
 		task_unlock(current);
+		if (!work->identity->files) {
+			/* failed grabbing files, ensure work gets cancelled */
+			work->flags |= IO_WQ_WORK_CANCEL;
+		}
 	}
 	if ((work->flags & IO_WQ_WORK_FS) && current->fs != work->identity->fs)
 		current->fs = work->identity->fs;