[PATCH 00/27] mtd-utils: make integck test independent

[Artem Bityutskiy <dedekind1@gmail.com>]

Hi, here is a patch-set which makes the integck test independent on the
common code which tests in tests/fs-tests/ directory share. You may be
wondering why the hack you need this :-) The explanation is rather long.

Q: Why you need to have integck independent?
A: Well, first of all I think integck is the only cool and useful test
   in the whole fs-tests directory. To other ones are not really useful.
   And I do not want to touch them at all.

   I plan to improve integck later, and this is preparation work. My
   improvements require nice error handling - not just dying in CHECK()
   macro. Do do this, I'll need to touch a lot of that common code. But
   since it is shared, I may brake some of the other tests if I touch it.
   Thus, I want to have integck independent on the other tests as the
   first step. And this patch-set is actually the preparation to the
   further planned work.

Q: So what are you going to do next?
A: Next I want to make all functions return error nicely (and free resources)
   if a write or any other FS modification operation fails. Currently the
   integck test just exits.

Q: Why you need that?
A: To test UBIFS with the power-cut emulation feature on. UBIFS can emulate
   power cuts, which means that integck may get an error at any time. In this
   case the test should be able to re-mount the tested file-system, check that
   fsync()'ed files are correct, and continue the testing. So nice error handling
   is just a preparation work.

   And longer term this is needed for unstable bits testing. I have UBI patches
   which emulates power cuts and unstable bits, and UBIFS is supposed to handle
   them nicely. But it does not currently. And to fix UBI/UBIFS i need a good
   test which is able to recover when a power cut is emulated and which is able
   to check integrity of those files which were fsync()'ed before the emulated
   power cut. But this is long-term plan. Hopefully I'll be able to finish
   this, but any help will be appreciated.

So, for now just these small preparations.

Artem.