reiserfs: Convert to writepages

Use buffer_migrate_folio to handle folio migration instead of writing
out dirty pages and reading them back in again.  Use writepages to write
out folios more efficiently.  We now only do that wait_on_write_block
check once per call to writepages instead of once per page.  It would be
possible to do one transaction per writeback run, but that's a bit of a
big change to do to this old filesystem, so leave it as one transaction
per folio (and leave reiserfs supporting only one page per folio).

Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Message-Id: <[email protected]>

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