From: Pavel Begunkov <asml.silence@gmail.com>
Date: Sun, 18 Oct 2020 09:17:37 +0000 (+0100)
Subject: io_uring: flags-based creds init in queue
X-Git-Tag: microblaze-v5.11~20^2~13
X-Git-Url: http://git.monstr.eu/?p=linux-2.6-microblaze.git;a=commitdiff_plain;h=2e5aa6cb4d159f1785eee50e4bcc7e9ffd4e4690;ds=sidebyside

io_uring: flags-based creds init in queue

Use IO_WQ_WORK_CREDS to figure out if req has creds to be used.
Since recently it should rely only on flags, but not value of
work.creds.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0f4a9c45061d..e9e8006fdf2e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6191,7 +6191,8 @@ static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
 again:
 	linked_timeout = io_prep_linked_timeout(req);
 
-	if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.identity->creds &&
+	if ((req->flags & REQ_F_WORK_INITIALIZED) &&
+	    (req->work.flags & IO_WQ_WORK_CREDS) &&
 	    req->work.identity->creds != current_cred()) {
 		if (old_creds)
 			revert_creds(old_creds);
@@ -6199,7 +6200,6 @@ again:
 			old_creds = NULL; /* restored original creds */
 		else
 			old_creds = override_creds(req->work.identity->creds);
-		req->work.flags |= IO_WQ_WORK_CREDS;
 	}
 
 	ret = io_issue_sqe(req, true, cs);