Follow-up Comment #5, bug #54913 (project findutils):
Linux has similar behaviour about d_ino, returning the inode number from the
parent filesystem rather than the mount point itself. This is a POSIX
violation, but there's little interest in fixing it:
https://groups.google.com/forum/#!topic/linux.kernel/4rzZRWKWT9c For similar
reasons, I expect this behaviour won't change in the Linux kernel :(
So what to do? It's quite the pessimization to require stat() for -type.
(Technically -type d can be answered without stat() because directories can
only be mounted over directories.) I think trusting d_type for everything
except mount points is a good idea.
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