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Rick Macklem authored
Without this patch, it is possible to hang the NFSv4 client, when a rename/remove is being done on a file where the client holds a delegation, if pNFS is being used. For a delegation to be returned, dirty data blocks must be flushed to the NFSv4 server. When pNFS is in use, a shared lock on the clientID must be acquired while doing a write to the DS(s). However, if rename/remove is doing the delegation return an exclusive lock will be acquired on the clientID, preventing the write to the DS(s) from acquiring a shared lock on the clientID. This patch stops rename/remove from doing a delegation return if pNFS is enabled. Since doing delegation return in the same compound as rename/remove is only an optimization, not doing so should not cause problems. This problem was detected during a recent NFSv4 interoperability testing event held by the IETF working group. MFC after: 1 week
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