linux-kernel - [RFC net-next io_uring 10/11] io_uring/notif: mark notifs with UARGFL_CALLER

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Message-Id: <19cad183acc3a44b17b76c1719ad30c80aeff1ef.1660124059.git.asml.silence@gmail.com>
Date:   Wed, 10 Aug 2022 16:49:18 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     io-uring@...r.kernel.org, netdev@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kernel-team@...com,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Wei Liu <wei.liu@...nel.org>, Paul Durrant <paul@....org>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [RFC net-next io_uring 10/11] io_uring/notif: mark notifs with UARGFL_CALLER_PINNED

We always keep references to active notifications and drop them only
when we flush, so they're always pinned during sock_sendmsg() and we can
add UARGFL_CALLER_PINNED.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 io_uring/notif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/notif.c b/io_uring/notif.c
index 5661681b3b44..dd346ea67580 100644
--- a/io_uring/notif.c
+++ b/io_uring/notif.c
@@ -66,7 +66,7 @@ struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx,
 	nd = io_notif_to_data(notif);
 	nd->account_pages = 0;
 	nd->uarg.skb_flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
-	nd->uarg.flags = 0;
+	nd->uarg.flags = UARGFL_CALLER_PINNED;
 	nd->uarg.callback = io_uring_tx_zerocopy_callback;
 	/* master ref owned by io_notif_slot, will be dropped on flush */
 	refcount_set(&nd->uarg.refcnt, 1);
-- 
2.37.0