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Make a copy of write_cache_pages() for the benefit of
ext4_da_writepages(). This allows us to simplify the code some, and
will allow us to further customize the code in future patches.
There are some nasty hacks in write_cache_pages(), which Linus has
(correctly) characterized as vile. I've just copied it into
write_cache_pages_da(), without trying to clean those bits up lest I
break something in the ext4's delalloc implementation, which is a bit
fragile right now. This will allow Dave Chinner to clean up
write_cache_pages() in mm/page-writeback.c, without worrying about
breaking ext4. Eventually write_cache_pages_da() will go away when I
rewrite ext4's delayed allocation and create a general
ext4_writepages() which is used for all of ext4's writeback. Until
now this is the lowest risk way to clean up the core
write_cache_pages() function.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Dave Chinner <david@fromorbit.com>
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