Write delegation

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Hi,

I am looking at the delegation implementation in the source code of
NFS 4.1 in kernel 2.6.32.15. I can find the code for read delegation,
which is working and can serve the read requests locally. But I can
never find the code about write delegation, which is supposed to cache
the write update locally. I try to look at the functions including
nfs_writepage(s), nfs_file_flush() but none of them checks or uses the
write delegation.

Is write delegation currently implemented in NFS 4.1?

Thanks!

best,

Yudong
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