md/raid10: writes should get directed to replacement as well as original.
When writing, we need to submit two writes, one to the original,
and one to the replacements - if there is a replacement.
If the write to the replacement results in a write error we just
fail the device. We only try to record write errors to the
original.
This only handles writing new data. Writing for resync/recovery
will come later.
Signed-off-by: NeilBrown <neilb@suse.de>
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