K 10
svn:author
V 3
des
K 8
svn:date
V 27
2011-04-29T21:18:41.087619Z
K 7
svn:log
V 411
Implement BIO_DELETE for vnode devices by simply overwriting the deleted
sectors with all-zeroes.

The zeroes come from a static buffer; null(4) uses a dynamic buffer for
the same purpose (for /dev/zero).  It might be a good idea to have a
static, shared, read-only all-zeroes page somewhere in the kernel that
md(4), null(4) and any other code that needs zeroes could use.

Reviewed by:	kib
MFC after:	3 weeks

END