[axboe-block:for-next] [block] 1122c0c1cc: aim7.jobs-per-min 22.6% improvement

[Christoph Hellwig]

Hi Oliver,

can you test the patch below?  It restores the previous behavior if
the device did not have a volatile write cache.  I think at least
for raid0 and raid1 without bitmap the new behavior actually is correct
and better, but it will need fixes for other modes.  If the underlying
devices did have a volatile write cache I'm a bit lost what the problem
was and this probably won't fix the issue.

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