nfs3 implementation issue?

[Xin Zhao]

In nfs/nfs3proc.c: nfs3_read_done(), I saw the following line:

   struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata;

I don't know why the tk_calldata is regarded as nfs_write_data instead
of nfs_read_data. When this rpc call is set up, we put
task->tk_calldata as a nfs_read_data object, why will it become a
nfs_write_data after the rpc call is done?

Can someone explain this a little bit?

Thanks!

Xin
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