[Tux3] logmap inode fix

[OGAWA Hirofumi]

OGAWA Hirofumi <hirofumi at mail.parknet.co.jp> writes:

> And blockread() of logmap never be used, we can get it via blockdev
> (volume map later), I think it is more clean/efficient way than reading
> logs via logmap. Because if we read the logs via logmap, it would have
> data alias issue.

And if we make logmap write-only, it would become same with delalloc
->i_apos like file/directory inode without current !btree->depth hack in
tux3_get_block(). So, I hope we don't need to add logmap specific code
to handle page cache. (Or we can just use page cache arrary for logmap)

Thanks.
-- 
OGAWA Hirofumi <hirofumi at mail.parknet.co.jp>

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