cifs_user_read and cifs_readpages (when EAGAIN on send of smb
on socket is returned over and over). Add POSIX (advisory) byte range
locking support (requires server with newest CIFS UNIX Extensions
-to the protocol implemented).
+to the protocol implemented). Slow down negprot slightly in port 139
+RFC1001 case to give session_init time on buggy servers.
Version 1.40
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