io_uring: optimise kiocb_end_write for !ISREG

file_end_write() is only for regular files, so the function do a couple
of dereferences to get inode and check for it. However, we already have
REQ_F_ISREG at hand, just use it and inline file_end_write().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -2431,11 +2431,11 @@ static void kiocb_end_write(struct io_kiocb *req)
 	 * thread.
 	 */
 	if (req->flags & REQ_F_ISREG) {
-		struct inode *inode = file_inode(req->file);
+		struct super_block *sb = file_inode(req->file)->i_sb;
 
-		__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
+		__sb_writers_acquired(sb, SB_FREEZE_WRITE);
+		sb_end_write(sb);
 	}
-	file_end_write(req->file);
 }
 
 #ifdef CONFIG_BLOCK