use PG_writeback in lustre

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(In reply to comment #85)
> Created an attachment (id=10733)
Please don't reply to lustre-devel. Instead, comment in
Bugzilla by using the following link:
 --> (https://bugzilla.lustre.org/attachment.cgi?id
=10733&action=view)
> 10547: handling recoverable error. v2
> 
> update handling recoverable error.      
New patch simplify code by merge handling recoverable errors
with handling
checksum errors.
Fixes handling recoverable errors for direct io case and
write partial page (not
exist at LLNL patch).
Also fixes bug with release page from cache if uses checksum
control and resend
limit exceed.

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