[bug #42318] find with xdev traverses other filesystem when mountpiont is subdirectory

[Daniele Palumbo]

Follow-up Comment #9, bug #42318 (project findutils):

>From POSIX section mentioned
"it shall cause find not to continue descending past directories that have a
different device ID (st_dev"
Key is the reference to primary.
Primary will have one st_dev, the mount point will have another one.
The directory on which a file system is mounted has indeed a different device
ID.

Example:
testserver ~ # stat /mnt/|grep Device
Device: fd01h/64769d Inode: 8196 Links: 3
testserver ~ # stat /mnt/testmount/|grep Device
Device: fd07h/64775d Inode: 2 Links: 2
testserver ~ #

So, i would read this as "if the directory has a different Device, do not list
it".

That of course is different from the current behavior.

BTW, http://austingroupbugs.net/view.php?id=1133 has been opened to clarify
POSIX understanding.
There is also a very interesting comment on the behavior that has to be kept
regarding -H and -L (symbolic link related) behavior.

"I can see making it a requirement mount names show when 
neither -H or -L specified, whether -xdev set or not, and hidden when either
option and -xdev is specified, treating the direct name as a symbolic link
body, essentially. This may be a breaking change, but covers both observed
behaviors. "

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