Konstantin Belousov 71421dc116 Verify that '..' still exists with the same inode number after
VFS_VGET() has returned in ufs_lookup(). If the '..' lookup started
immediately before the parent directory was removed, we might return
either cleared or unrelated inode otherwise.

Ufs_lookup() is split into new function ufs_lookup_() that either does
lookup, or verifies that directory entry exists and references supplied
inode number.

Reviewed by:	tegge
Tested by:	pho,
	Andreas Tobler <andreast-list fgznet ch> (previous version)
MFC after:	1 month
2009-04-16 09:57:08 +00:00
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