block: sed-opal: add ioctl for done-mark of shadow mbr

Enable users to mark the shadow mbr as done without completely
deactivating the shadow mbr feature. This may be useful on reboots,
when the power to the disk is not disconnected in between and the shadow
mbr stores the required boot files. Of course, this saves also the
(few) commands required to enable the feature if it is already enabled
and one only wants to mark the shadow mbr as done.

Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed by: Scott Bauer <sbauer@plzdonthack.me>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 27 insertions, 0 deletions

diff --git a/block/sed-opal.c b/block/sed-opal.c
index c54019c11e91..f94f359dd688 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -1989,6 +1989,30 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 	return ret;
 }
 
+static int opal_set_mbr_done(struct opal_dev *dev,
+			     struct opal_mbr_done *mbr_done)
+{
+	u8 mbr_done_tf = mbr_done->done_flag == OPAL_MBR_DONE ?
+		OPAL_TRUE : OPAL_FALSE;
+
+	const struct opal_step mbr_steps[] = {
+		{ start_admin1LSP_opal_session, &mbr_done->key },
+		{ set_mbr_done, &mbr_done_tf },
+		{ end_opal_session, }
+	};
+	int ret;
+
+	if (mbr_done->done_flag != OPAL_MBR_DONE &&
+	    mbr_done->done_flag != OPAL_MBR_NOT_DONE)
+		return -EINVAL;
+
+	mutex_lock(&dev->dev_lock);
+	setup_opal_dev(dev);
+	ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
+	mutex_unlock(&dev->dev_lock);
+	return ret;
+}
+
 static int opal_save(struct opal_dev *dev, struct opal_lock_unlock *lk_unlk)
 {
 	struct opal_suspend_data *suspend;
@@ -2310,6 +2334,9 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
 	case IOC_OPAL_ENABLE_DISABLE_MBR:
 		ret = opal_enable_disable_shadow_mbr(dev, p);
 		break;
+	case IOC_OPAL_MBR_DONE:
+		ret = opal_set_mbr_done(dev, p);
+		break;
 	case IOC_OPAL_ERASE_LR:
 		ret = opal_erase_locking_range(dev, p);
 		break;