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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-10-12 22:23:30 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-11-18 19:28:01 +0100 |
| commit | 5ea42986694a96542644f9cae8b122d3a00c508f (patch) | |
| tree | dd74685d8cd41e39ad14e708cb6e00e0ed016fb1 /drivers/block/xen-blkback/xenbus.c | |
| parent | xen/blk[front|back]: Squash blkif_request_rw and blkif_request_discard together (diff) | |
| download | linux-5ea42986694a96542644f9cae8b122d3a00c508f.tar.xz linux-5ea42986694a96542644f9cae8b122d3a00c508f.zip | |
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>
Diffstat (limited to 'drivers/block/xen-blkback/xenbus.c')
| -rw-r--r-- | drivers/block/xen-blkback/xenbus.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index f759ad4584c3..187fd2c1a15d 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -338,6 +338,9 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle, if (q && q->flush_flags) vbd->flush_support = true; + if (q && blk_queue_secdiscard(q)) + vbd->discard_secure = true; + DPRINTK("Successful creation of handle=%04x (dom=%u)\n", handle, blkif->domid); return 0; @@ -420,6 +423,15 @@ int xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info *be) state = 1; blkif->blk_backend_type = BLKIF_BACKEND_PHY; } + /* Optional. */ + err = xenbus_printf(xbt, dev->nodename, + "discard-secure", "%d", + blkif->vbd.discard_secure); + if (err) { + xenbus_dev_fatal(dev, err, + "writting discard-secure"); + goto kfree; + } } } else { err = PTR_ERR(type); |