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- Disentangle the usage of ObpAcquireDirectoryLockExclusive() when it's used only for accessing a directory structure, or as part of a lookup operation. The Obp*DirectoryLock*() -- both shared and exclusive -- functions are only for locking an OB directory, for reading or writing its structure members. When performing lookup operations (insertions/deletions of entries within a directory), use a ObpAcquireLookupContextLock() function that exclusively locks the directory and saves extra lock state, that can be used by ObpReleaseLookupContextObject() for cleanup. - Add documentation for these functions.