[PATCH 0/2] Add data to datalog, add replay tool, V02

[Manfred Spraul <manfred@colorfullife.com>]

Hi,

Updated series. For now, only 2 changes, I'll update the rest
after review.

Patch 1: Add support for pretty-printing WRITE_ZEROS and TRIM to
        nbd-trdump. I've added a 'static inline' helper function to a
        new header file.
Changes:
	- Support added for all commands mentioned in proto.md,
	  even the experimental commands.
	- use #param to reduce copy/paste.

Patch 2: Add actual data logging to nbd-server
	I've defined a new magic for a new request type to indicate
	the new contents of the log.

Changes:
	- Introduction of a new magic, and use that for a header
	  of the log file.

Questions:
	- Should I update proto.md and declare the magic as reserved?
	- I have reused the existing struct nbd_req. Is that ok, or
	  should I define a new structure with exactly the needed
	  fields?
	- Should nbd-trdump abort when it encounters an unknown
	  flag? I would say no: It is a development tool, thus
	  the human reader can/must interpret the output anyways.

--
	Manfred