tree dd74685d8cd41e39ad14e708cb6e00e0ed016fb1
parent 97e36834f5a106459ab1b290e663a4eb6264639e
author Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1318451010 -0400
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1321640881 -0500

xen/blk[front|back]: Enhance discard support with secure erasing support.

Part of the blkdev_issue_discard(xx) operation is that it can also
issue a secure discard operation that will permanantly remove the
sectors in question. We advertise that we can support that via the
'discard-secure' attribute and on the request, if the 'secure' bit
is set, we will attempt to pass in REQ_DISCARD | REQ_SECURE.

CC: Li Dongyang <lidongyang@novell.com>
[v1: Used 'flag' instead of 'secure:1' bit]
[v2: Use 'reserved' uint8_t instead of adding a new value]
[v3: Check for nseg when mapping instead of operation]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>