Re: [PATCH v6 0/4] MR6855: server: Fix renaming file to a hardlink of itself.

[Gabriel Ivăncescu]

I'm not sure how to do it here. I can use the source's fd->inode and
device but:

1. How do I check if it's a directory without `stat`ing it? (needed for
the first fstat() but also below at the `if (create_link || S_ISDIR(
st2.st_mode ))` line)

2. `unlink_closed_fd` appears to think it can mismatch. I mean it makes
sense (since in Linux we can remove open fds), didn't know we even guard
against it though. Should it be a concern here?