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NFS4 locking file question

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# 1  
Old 04-28-2011
NFS4 locking file question
All,
Just wondering if someone has a file open on client A for writing and it is locked, is that file still readable from client A or B?

Basically I'm just wanting to know if a file is opened already, can it still be opened for read only?
# 2  
Old 04-29-2011
The specification ( http://www.ietf.org/rfc/rfc3530.txt ) delineates read-locks and write-locks.

So, if your systems support mandatory locking, the result will be the same server to client as it is for local file I/O. The locks apply everywhere -> to all nfs clients.
If I open the file lock-write, nobody else can write the file. Nobody else can open the file for read-lock either. On your system - Read locks may be called shared locks; write locks exclusive locks.

I'm not sure what else will help you.
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