NFSv4.1: Ask for no delegation on OPEN if using O_DIRECT

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If we're using NFSv4.1, then we have the ability to let the server know
whether or not we believe that returning a delegation as part of our OPEN
request would be useful.
The feature needs to be used with care, since the client sending the request
doesn't necessarily know how other clients are using that file, and how
they may be affected by the delegation.
For this reason, our initial use of the feature will be to let the server
know when the client believes that handing out a delegation would not be
useful.
The first application for this function is when opening the file using
O_DIRECT.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

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Trond Myklebust 2015-01-30 14:21:14 -05:00

parent 0e3b137fbf

commit 6ae373394c

3 changed files with 85 additions and 26 deletions

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30

fs/nfs/nfs4proc.c

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79

fs/nfs/nfs4xdr.c

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2

include/linux/nfs_xdr.h

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