New in v2:
- Added a PREPARING state in patch 1 to prevent a race condition that Laurent
mentioned (two QBUF calls with the same index number at the same time).
- Changed some minor issues in patch 4 that Laurent mentioned in his review.
- Added the reworked version of Andy's original patch to r
This patch series does some cleanups in the qbuf/prepare_buf handling
(the first two patches). The third patch removes the 'fileio = NULL'
hack. That hack no longer works when dealing with asynchronous calls
from a kernel thread so it had to be fixed.
The next three patches implement retrying star
