[PATCH 5.15 52/76] io_uring: use kiocb_{start,end}_write() helpers

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Amir Goldstein <amir73il@gmail.com>

Commit e484fd73f4bdcb00c2188100c2d84e9f3f5c9f7d upstream.

Use helpers instead of the open coded dance to silence lockdep warnings.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Message-Id: <20230817141337.1025891-5-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 io_uring/io_uring.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 7afa3827bfd5e..718ab6a418425 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2674,15 +2674,10 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
 
 static void io_req_end_write(struct io_kiocb *req)
 {
-	/*
-	 * Tell lockdep we inherited freeze protection from submission
-	 * thread.
-	 */
 	if (req->flags & REQ_F_ISREG) {
-		struct super_block *sb = file_inode(req->file)->i_sb;
+		struct io_rw *rw = &req->rw;
 
-		__sb_writers_acquired(sb, SB_FREEZE_WRITE);
-		sb_end_write(sb);
+		kiocb_end_write(&rw->kiocb);
 	}
 }
 
@@ -3775,18 +3770,8 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(ret))
 		goto out_free;
 
-	/*
-	 * Open-code file_start_write here to grab freeze protection,
-	 * which will be released by another thread in
-	 * io_complete_rw().  Fool lockdep by telling it the lock got
-	 * released so that it doesn't complain about the held lock when
-	 * we return to userspace.
-	 */
-	if (req->flags & REQ_F_ISREG) {
-		sb_start_write(file_inode(req->file)->i_sb);
-		__sb_writers_release(file_inode(req->file)->i_sb,
-					SB_FREEZE_WRITE);
-	}
+	if (req->flags & REQ_F_ISREG)
+		kiocb_start_write(kiocb);
 	kiocb->ki_flags |= IOCB_WRITE;
 
 	if (req->file->f_op->write_iter)
-- 
2.43.0