f2fs do DIO write make file corruption

[Wu Bo]

I use the following command to create a file, the file may got corruption:
	f2fs_io write 2 0 512 inc_num dio $path

And when I use bio or to set the chunk size to 1 block, the file is 
normal. The commands as following:
	f2fs_io write 2 0 512 inc_num buffered $path
	f2fs_io write 1 0 512 inc_num dio $path

I find this bug on old kernel version 4.14.117, and not find on version 
4.19.152. So this bug is fixed. Can anyone can tell me which patch fixed 
this bug?