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SubjectRe: Finding hardlinks
> And does it matter? If you rename a file, tar might skip it no matter of 
> hardlink detection (if readdir races with rename, you can read none of the
> names of file, one or both --- all these are possible).
> If you have "dir1/a" hardlinked to "dir1/b" and while tar runs you delete
> both "a" and "b" and create totally new files "dir2/c" linked to "dir2/d",
> tar might hardlink both "c" and "d" to "a" and "b".
> No one guarantees you sane result of tar or cp -a while changing the tree.
> I don't see how is_samefile() could make it worse.

There are several cases where changing the tree doesn't affect the
correctness of the tar or cp -a result. In some of these cases using
samefile() instead of st_ino _will_ result in a corrupted result.

Generally samefile() is _weaker_ than the st_ino interface in
comparing the identity of two files without using massive amounts of
memory. You're searching for a better solution, not one that is
broken in a different way, aren't you?

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