Re: FAILED: patch "[PATCH] Revert "io_uring/rw: drop -EOPNOTSUPP check in" failed to apply to 6.12-stable tree

[Jens Axboe <axboe@kernel.dk>]

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On 10/20/25 2:00 AM, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 6.12-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.

Easy fixup, here's one for 6.12-stable.

-- 
Jens Axboe

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From eaffa2f6affba1c4b91d3a75b6e6d9e31adc5a26 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 13 Oct 2025 12:05:31 -0600
Subject: [PATCH] Revert "io_uring/rw: drop -EOPNOTSUPP check in
 __io_complete_rw_common()"

Commit 927069c4ac2cd1a37efa468596fb5b8f86db9df0 upstream.

This reverts commit 90bfb28d5fa8127a113a140c9791ea0b40ab156a.

Kevin reports that this commit causes an issue for him with LVM
snapshots, most likely because of turning off NOWAIT support while a
snapshot is being created. This makes -EOPNOTSUPP bubble back through
the completion handler, where io_uring read/write handling should just
retry it.

Reinstate the previous check removed by the referenced commit.

Cc: stable@vger.kernel.org
Fixes: 90bfb28d5fa8 ("io_uring/rw: drop -EOPNOTSUPP check in __io_complete_rw_common()")
Reported-by: Salvatore Bonaccorso <carnil@debian.org>
Reported-by: Kevin Lumik <kevin@xf.ee>
Link: https://lore.kernel.org/io-uring/cceb723c-051b-4de2-9a4c-4aa82e1619ee@kernel.dk/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/rw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/rw.c b/io_uring/rw.c
index 3ad104cf1e7d..996cd4bec482 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -477,7 +477,7 @@ static void io_req_io_end(struct io_kiocb *req)
 static bool __io_complete_rw_common(struct io_kiocb *req, long res)
 {
 	if (unlikely(res != req->cqe.res)) {
-		if (res == -EAGAIN && io_rw_should_reissue(req)) {
+		if ((res == -EOPNOTSUPP || res == -EAGAIN) && io_rw_should_reissue(req)) {
 			/*
 			 * Reissue will start accounting again, finish the
 			 * current cycle.
-- 
2.51.0