[PATCH stable-6.1 3/3] io_uring/rw: commit provided buffer state on async

[Pavel Begunkov <asml.silence@gmail.com>]

[ upstream commit d63b0e8a628e62ca85a0f7915230186bb92f8bb4 ]

When we get -EIOCBQUEUED, we need to ensure that the buffer is consumed
from the provided buffer ring, which can be done with io_kbuf_recycle()
+ REQ_F_PARTIAL_IO.

Reported-by: Muhammad Ramdhan <ramdhan@starlabs.sg>
Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Reported-by: Jacob Soo <jacob.soo@starlabs.sg>
Fixes: c7fb19428d67d ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/rw.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/io_uring/rw.c b/io_uring/rw.c
index 692663bd864f..b75f62dccce6 100644
--- a/io_uring/rw.c
+++ b/io_uring/rw.c
@@ -772,6 +772,8 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags)
 			goto done;
 		ret = 0;
 	} else if (ret == -EIOCBQUEUED) {
+		req->flags |= REQ_F_PARTIAL_IO;
+		io_kbuf_recycle(req, issue_flags);
 		if (iovec)
 			kfree(iovec);
 		return IOU_ISSUE_SKIP_COMPLETE;
@@ -795,6 +797,9 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags)
 		goto done;
 	}
 
+	req->flags |= REQ_F_PARTIAL_IO;
+	io_kbuf_recycle(req, issue_flags);
+
 	io = req->async_data;
 	s = &io->s;
 	/*
@@ -935,6 +940,11 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
 	else
 		ret2 = -EINVAL;
 
+	if (ret2 == -EIOCBQUEUED) {
+		req->flags |= REQ_F_PARTIAL_IO;
+		io_kbuf_recycle(req, issue_flags);
+	}
+
 	if (req->flags & REQ_F_REISSUE) {
 		req->flags &= ~REQ_F_REISSUE;
 		ret2 = -EAGAIN;
-- 
2.48.1