This is version 3 of the ocfs2 tail zeroing fixes. This version
has some major changes. Tao correctly pointed out that we can have
multiple extents past i_size due to unwritten extents. I've reworked
the zeroing code to walk them all. Since I had to do that, and I had to
handle refcounted extents, I end up fixing a refcount bug with
non-sparse extentds.
There are now three patches. The first changes our zeroing
code to go page-by-page at the high level. The second actually changes
the zeroing code. The final patch, limiting zeroing to the end of a
write, is unchanged from v2.
Joel
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