[PATCH v3 5/7] aio: use kiocb_{start,end}_write() helpers

[Amir Goldstein <amir73il@gmail.com>]

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>
---
 fs/aio.c | 20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 77e33619de40..b3174da80ff6 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1447,13 +1447,8 @@ static void aio_complete_rw(struct kiocb *kiocb, long res)
 	if (kiocb->ki_flags & IOCB_WRITE) {
 		struct inode *inode = file_inode(kiocb->ki_filp);
 
-		/*
-		 * Tell lockdep we inherited freeze protection from submission
-		 * thread.
-		 */
 		if (S_ISREG(inode->i_mode))
-			__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
-		file_end_write(kiocb->ki_filp);
+			kiocb_end_write(kiocb);
 	}
 
 	iocb->ki_res.res = res;
@@ -1581,17 +1576,8 @@ static int aio_write(struct kiocb *req, const struct iocb *iocb,
 		return ret;
 	ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter));
 	if (!ret) {
-		/*
-		 * Open-code file_start_write here to grab freeze protection,
-		 * which will be released by another thread in
-		 * aio_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 (S_ISREG(file_inode(file)->i_mode)) {
-			sb_start_write(file_inode(file)->i_sb);
-			__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
-		}
+		if (S_ISREG(file_inode(file)->i_mode))
+			kiocb_start_write(req);
 		req->ki_flags |= IOCB_WRITE;
 		aio_rw_done(req, call_write_iter(file, req, &iter));
 	}
-- 
2.34.1