More recvfile optimizations

[Stefan (metze) Metzmacher]

Hi Jeremy,

here're some more smb2 recvfile optimizations.

The big TODO is an existing bug that we don't really check if the file
handle
supports recvfile, a named pipe doesn't support this and a print file
may also doesn't support
it. Currently it seems we don't have any good logic/checks to handle this.
Do you have an idea how to do this properly for SMB1 and SMB2?

This is just for discussion yet until we discussed the above...

metze
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