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.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x 927069c4ac2cd1a37efa468596fb5b8f86db9df0 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025102039-bonelike-vocation-0372@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 927069c4ac2cd1a37efa468596fb5b8f86db9df0 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()"

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

diff --git a/io_uring/rw.c b/io_uring/rw.c index 08882648d569..a0f9d2021e3f 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -542,7 +542,7 @@ static void __io_complete_rw_common(struct io_kiocb *req, long res) { if (res == req->cqe.res) return; - if (res == -EAGAIN && io_rw_should_reissue(req)) { + if ((res == -EOPNOTSUPP || res == -EAGAIN) && io_rw_should_reissue(req)) { req->flags |= REQ_F_REISSUE | REQ_F_BL_NO_RECYCLE; } else { req_set_fail(req);