nfsd: fix EXDEV checking in rename
We again check for the EXDEV a little later on, so the first check is redundant. This check is also slightly racier, since a badly timed eviction from the export cache could leave us with the two fh_export pointers pointing to two different cache entries which each refer to the same underlying export. It's better to compare vfsmounts as the later check does, but that leaves a minor security hole in the case where the two exports refer to two different directories especially if (for example) they have different root-squashing options. So, compare ex_path.dentry too. Reported-by:Joe Habermann <joe.habermann@gmail.com> Signed-off-by:
J. Bruce Fields <bfields@redhat.com>
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030d794b