Messages in this thread | | | Subject | Re: [NFS] Re: Non-blocking lock requests during the grace period | From | Juan Gomez <> | Date | Tue, 19 Nov 2002 10:06:11 -0800 |
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Mike,
I agree with the F_GETLK part, as I pointed out to Trond earlier. However, I feel it is odd to block a client for about one minutre when it issues "non-blocking" lock requests. I have seen that Solaris code does so but still feels odd and it may conflict with what most programmers expect, though I see your point, perhaps if this was well documented in man pages there would not be a problem. In Linux this is not the case.
Juan
|---------+----------------------------> | | mike.kupfer@sun.c| | | om | | | Sent by: | | | kupfer@athyra.eng| | | .sun.com | | | | | | | | | 11/18/02 05:04 PM| | | | |---------+----------------------------> >-------------------------------------------------------------------------------------------------------------------------| | | | To: trond.myklebust@fys.uio.no | | cc: Juan Gomez/Almaden/IBM@IBMUS, linux-kernel@vger.kernel.org, nfs@lists.sourceforge.net | | Subject: Re: [NFS] Re: Non-blocking lock requests during the grace period | | | | | >-------------------------------------------------------------------------------------------------------------------------|
>>>>> "Trond" == Trond Myklebust <trond.myklebust@fys.uio.no> writes:
>>>>> " " == Juan Gomez <juang@us.ibm.com> writes:
>> (note that F_GETLK man page does not provide EAGAIN as a >> possible error code).
F_GETLK indicates a conflict by changing the arg struct to show the conflicting lock.
As for the original topic, I would hesitate before changing the client locking code to return EAGAIN just because the server is in its grace period. The "blocking" or "non-blocking" behavior is tied to what happens when there is already a lock that conflicts with the requested one. When the server is in the grace period, it's unknown as to whether there is already a lock that conflicts with the requested one.
Mike Kupfer mike.kupfer@sun.com Solaris File Sharing Speaking for myself, not for Sun.
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