IWAMOTO Toshihiro [off-list ref] wrote:

- If a page is in mapping->io_pages when remap happens, it will be
   moved to dirty_pages.  Tracking page->list to find out the list
   which page is connected to would be too expensive, and I have no other
   idea.

That sounds like a reasonable thing to do.  The only impact would be that
an fsync() which is currently in progress could fail to write the page, so
the page is still dirty after the fsync() returns.

If this is the biggest problem, you've done well ;)
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