filesystem (and other things that needed to be fixed before the tests
would complete), to wit:
* Include the fs ident in the filehandle; improve stale filehandle checks.
* Change definition of blksize() to use the on-dinode size instead of
the inode's i_size, so that fsck_lfs will work properly again.
* Use b_interlock in lfs_vtruncbuf.
* Postpone dirop reclamation until after the seglock has been released,
so that lfs_truncate is not called with the segment lock held.
* Don't loop in lfs_fsync(), just write everything and wait.
* Be more careful about the interlock/uobjlock in lfs_putpages: when we
lose this lock, we have to resynchronize dirtiness of pages in each
block.
* Be sure to always write indirect blocks and update metadata in
lfs_putpages; fixes a bug that caused blocks to be accounted to the
wrong segment.
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