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stop using ioends for direct write completions

To: xfs@xxxxxxxxxxx
Subject: stop using ioends for direct write completions
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 14 Jan 2016 11:10:36 +0100
Cc: darrick.wong@xxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
The patch below rewrites the direct write I/O completion path to avoid
the use of ioends.  Besides simplifying the code this will also allow
us to make COW I/O a type of it's own for the buffer I/O path.

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