cifs: add a callback function to receive the rest of the frame
In order to handle larger SMBs for readpages and other calls, we want to be able to read into a preallocated set of buffers. Rather than changing all of the existing code to preallocate buffers however, we instead add a receive callback function to the MID. cifsd will call this function once the mid_q_entry has been identified in order to receive the rest of the SMB. If the mid can't be identified or the receive pointer is unset, then the standard 3rd phase receive function will be called. Reviewed-and-Tested-by: NPavel Shilovsky <piastry@etersoft.ru> Signed-off-by: NJeff Layton <jlayton@redhat.com>
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