f2fs: fix to data block override node segment by mistake
The following race could lead to data block override node segment by mistake.
Task A | Task B | Task C | Task D
======= | ======== |========== | =========
open file | | |
white file | | |
submit bio | | |
wait io complete | | |
| remove file | |
........ | iput_final | |
| | sync |
| | do checkpoint |
| | data segment free |
| | | create file1
| | | allocate node segment（if it is the same segment freed by Task C）
f2fs_write_end_io | | |
So we need to guarantee io complete before truncate inode
in f2fs_drop_inode.
Signed-off-by: Zheng Liang <zhengliang6@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 file changed