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bbfa235
(Get the code!)
Minor nit...we get the correct st_ino for the directory. The problem is that we don't have accurate st_dev info at that point since the mount hasn't occurred yet.
That said...it would be nice to be able to flag the entries in the way that Peter suggests. The question is how to do that in a way that's compatible with POSIX here.
Maybe we could declare a new S_IF* value for st_mode:
S_IFXDEV 020000
That should allow us to leave the S_IFDIR bit set and it employs a bit that's outside of __S_IFMT. The kernel could set this bit in the statbuf when it detects that the fsid on the inode is not the same as that of the parent directory.
The big question is whether and if someone wants to implement this and then sell it upstream :)