[PATCH V4] UBI: modify ubi_wl_flush function to clear work queue for a lnum

[Artem Bityutskiy]

On Sun, 2012-05-20 at 21:27 +0200, Joel Reardon wrote:
> This patch modifies ubi_wl_flush to force the erasure of
> particular volume id / logical eraseblock number pairs. Previous functionality
> is preserved when passing UBI_UNKNOWN for both values. The locations where ubi_wl_flush
> were called are appropriately changed: ubi_leb_erase only flushes for the
> erased LEB, and ubi_create_volume forces only flushing for its volume id.
> External code can call this new feature via the new function ubi_flush() added
> to kapi.c, which simply passes through to ubi_wl_flush().
> 
> This was tested by disabling the call to do_work in ubi thread, which results
> in the work queue remaining unless explicitly called to remove. UBIFS was
> changed to call ubifs_leb_change 50 times for four different LEBs. Then the
> new function was called to clear the queue: passing wrong volume ids / lnum,
> correct ones, and finally UBI_UNKNOWN for both to ensure it was finally all
> cleard. The work queue was dumped each time and the selective removal
> of the particular LEB numbers was observed. Extra checks were enabled and
> ubifs's integck was also run. Finally, the drive was repeatedly filled and emptied to
> ensure that the queue was cleared normally.

I've amended this patch to use UBI_ALL instead, and pushed to
linux-ubi.git tree, and in your branch as well. I'll send it to Linus
this merge window as well. Thanks!

-- 
Best Regards,
Artem Bityutskiy
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