[Tux3] symlink, truncate, unlink, link, and some bug fixes

[OGAWA Hirofumi]

Hi,

Those patches fix some bugs, and adds new handlers ->symlink(),
->truncate(), ->delete_inode(), ->unlink(), and ->link().

There are some bugs, e.g. purge_inum() doesn't truncate bnode/ileaf
itself. And we don't free blocks on delete/truncate (need to implement
free_block()). Those have to be fixed soon or later.

	static-http://userweb.kernel.org/~hirofumi/tux3/

Please review it.
-- 
OGAWA Hirofumi <hirofumi at mail.parknet.co.jp>

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