Re: [PATCH] nilfs2: prevent double insertion of b_assoc_buffers in dirty buffer lookup

[wuyankun]

Thanks a lot for the detailed investigation and for clarifying the actual root cause. 
That explanation makes sense, and I agree that the proper fix should be a bounds check 
in nilfs_ioctl_move_inode_block() rather than masking it in nilfs_lookup_dirty_data_buffers().

Please go ahead and handle the fix patch on your side. 
I appreciate the help and the clear breakdown of the issue.