UBIFS Corrupt during power failure

[Eric Holmberg]

> > I will run 4 boards through torture tests starting tonight 
> and let you
> > know later this week!  Based upon the errors that I've seen 
> and looking
> > at the patch, I think that should solve the problem.
> > 
> > Great work guys!
> 
> Yeah :-)
> 
> I've been holding off trying UBI on NOR.  Now it's looking 
> more tempting :-)
> 

Test Results - PASS
-------------------
I just finished a test run of 3 boards with a total of 8104 power cycles
during read/modify/write operations on UBIFS.  The system cuts power
randomly after mounting the UBIFS image while performing read/write file
operations on the UBIFS root file system.

I experienced 0 failures.  Typically, I was getting less than 100 cycles
before failures.

Software:
 * 2.6.27-rc9 kernel
 * UBIFS patches up to July 10
 * CFI Write buffer size limited to 8 bytes (NOR chip supports 32 bytes)
 * No power cycling during mount

Patch:
http://git.infradead.org/users/dedekind/ubifs-v2.6.27.git?a=commit;h=201
fce21a67d74e9703127af0d6c6084003796bb

Remaining tasks:
 * Anybody:  Add support to UBI/UBIFS to allow for block-write sizes
greater than 8 bytes
 * Test with power failures during deferred recovery

Thanks for everybody's help so far!  I will hopefully get a chance to
setup the power-failures during deferred recovery this weekend.

-Eric