This is a note to let you know that I've just added the patch titled
io_uring/msg_ring: move double lock/unlock helpers higher up
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-msg_ring-move-double-lock-unlock-helpers-higher-up.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5c3ffa8ec64e0726dcbfe37b5d126701301011ed Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Thu, 19 Jan 2023 09:01:27 -0700
Subject: io_uring/msg_ring: move double lock/unlock helpers higher up
From: Jens Axboe <axboe@xxxxxxxxx>
Commit 423d5081d0451faa59a707e57373801da5b40141 upstream.
In preparation for needing them somewhere else, move them and get rid of
the unused 'issue_flags' for the unlock side.
No functional changes in this patch.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/msg_ring.c | 47 +++++++++++++++++++++++------------------------
1 file changed, 23 insertions(+), 24 deletions(-)
--- a/io_uring/msg_ring.c
+++ b/io_uring/msg_ring.c
@@ -24,6 +24,28 @@ struct io_msg {
u32 flags;
};
+static void io_double_unlock_ctx(struct io_ring_ctx *octx)
+{
+ mutex_unlock(&octx->uring_lock);
+}
+
+static int io_double_lock_ctx(struct io_ring_ctx *octx,
+ unsigned int issue_flags)
+{
+ /*
+ * To ensure proper ordering between the two ctxs, we can only
+ * attempt a trylock on the target. If that fails and we already have
+ * the source ctx lock, punt to io-wq.
+ */
+ if (!(issue_flags & IO_URING_F_UNLOCKED)) {
+ if (!mutex_trylock(&octx->uring_lock))
+ return -EAGAIN;
+ return 0;
+ }
+ mutex_lock(&octx->uring_lock);
+ return 0;
+}
+
void io_msg_ring_cleanup(struct io_kiocb *req)
{
struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
@@ -51,29 +73,6 @@ static int io_msg_ring_data(struct io_ki
return -EOVERFLOW;
}
-static void io_double_unlock_ctx(struct io_ring_ctx *octx,
- unsigned int issue_flags)
-{
- mutex_unlock(&octx->uring_lock);
-}
-
-static int io_double_lock_ctx(struct io_ring_ctx *octx,
- unsigned int issue_flags)
-{
- /*
- * To ensure proper ordering between the two ctxs, we can only
- * attempt a trylock on the target. If that fails and we already have
- * the source ctx lock, punt to io-wq.
- */
- if (!(issue_flags & IO_URING_F_UNLOCKED)) {
- if (!mutex_trylock(&octx->uring_lock))
- return -EAGAIN;
- return 0;
- }
- mutex_lock(&octx->uring_lock);
- return 0;
-}
-
static struct file *io_msg_grab_file(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
@@ -122,7 +121,7 @@ static int io_msg_install_complete(struc
if (!io_post_aux_cqe(target_ctx, msg->user_data, ret, 0, true))
ret = -EOVERFLOW;
out_unlock:
- io_double_unlock_ctx(target_ctx, issue_flags);
+ io_double_unlock_ctx(target_ctx);
return ret;
}
Patches currently in stable-queue which might be from axboe@xxxxxxxxx are
queue-6.1/io_uring-msg_ring-move-double-lock-unlock-helpers-higher-up.patch
queue-6.1/io_uring-msg_ring-fix-missing-lock-on-overflow-for-iopoll.patch
queue-6.1/io_uring-extract-a-io_msg_install_complete-helper.patch
queue-6.1/io_uring-get-rid-of-double-locking.patch
