While looking at the log structured file system code in NetBSD, I notice
that the buffer synchronization uses B_BUSY and B_WANTED flags instead of
BUF_LOCK() used in FreeBSD.  Can any one tell me if there is any technical
differences between the two approaches?  Or are they basically equivalent?

BTW, how stable is the LFS code in NetBSD?

Any enlightment is appreciated.

-Zhihui