[bug #23443] find regression: now fooled when crossing mountpoints

[Jim Meyering]

Follow-up Comment #10, bug #23443 (project findutils):

Hi James.

Actually, yes.
Whereas the gnulib-fts cycle checks only device and inode numbers (because
that's all it needs to do on POSIX-conforming file system), some tools resort
to comparing additional members of struct stat.  For example diff has an
option you can enable (configure-time?) to make it perform extra checks of
several other members.  Note how the comparison in comment #5 shows size, link
count and block count fields differ, even though dev/inode match.

Unfortunately, testing those fields would mean storing them, and currently we
don't store an entire 144-byte stat field, but rather just dev+inode for the
cycle check.  We'll have to weigh the cost/benefit of encumbering the code
(that will impact all users) to accommodate a non-POSIX file system.

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