dm: add support for secure erase forwarding
Set QUEUE_FLAG_SECERASE in DM device's queue_flags if a DM table's
data devices support secure erase.
Also, add support for secure erase to both the linear and striped
targets.
Signed-off-by: Denis Semakin <d.semakin@omprussia.ru>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index d5f8eff..ff751b0 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -59,6 +59,7 @@
ti->num_flush_bios = 1;
ti->num_discard_bios = 1;
+ ti->num_secure_erase_bios = 1;
ti->num_write_same_bios = 1;
ti->num_write_zeroes_bios = 1;
ti->private = lc;
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index cd209e8..bb907cb 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -169,6 +169,7 @@
ti->num_flush_bios = stripes;
ti->num_discard_bios = stripes;
+ ti->num_secure_erase_bios = stripes;
ti->num_write_same_bios = stripes;
ti->num_write_zeroes_bios = stripes;
@@ -295,6 +296,7 @@
return DM_MAPIO_REMAPPED;
}
if (unlikely(bio_op(bio) == REQ_OP_DISCARD) ||
+ unlikely(bio_op(bio) == REQ_OP_SECURE_ERASE) ||
unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES) ||
unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) {
target_bio_nr = dm_bio_get_target_bio_nr(bio);
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 7eb3e2a..f20fbc9 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1846,6 +1846,34 @@
return true;
}
+static int device_not_secure_erase_capable(struct dm_target *ti,
+ struct dm_dev *dev, sector_t start,
+ sector_t len, void *data)
+{
+ struct request_queue *q = bdev_get_queue(dev->bdev);
+
+ return q && !blk_queue_secure_erase(q);
+}
+
+static bool dm_table_supports_secure_erase(struct dm_table *t)
+{
+ struct dm_target *ti;
+ unsigned int i;
+
+ for (i = 0; i < dm_table_get_num_targets(t); i++) {
+ ti = dm_table_get_target(t, i);
+
+ if (!ti->num_secure_erase_bios)
+ return false;
+
+ if (!ti->type->iterate_devices ||
+ ti->type->iterate_devices(ti, device_not_secure_erase_capable, NULL))
+ return false;
+ }
+
+ return true;
+}
+
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
@@ -1867,6 +1895,9 @@
} else
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
+ if (dm_table_supports_secure_erase(t))
+ queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, q);
+
if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
wc = true;
if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 038c757..3b3cbd1 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1414,6 +1414,11 @@
return ti->num_discard_bios;
}
+static unsigned get_num_secure_erase_bios(struct dm_target *ti)
+{
+ return ti->num_secure_erase_bios;
+}
+
static unsigned get_num_write_same_bios(struct dm_target *ti)
{
return ti->num_write_same_bios;
@@ -1467,6 +1472,11 @@
is_split_required_for_discard);
}
+static int __send_secure_erase(struct clone_info *ci, struct dm_target *ti)
+{
+ return __send_changing_extent_only(ci, ti, get_num_secure_erase_bios, NULL);
+}
+
static int __send_write_same(struct clone_info *ci, struct dm_target *ti)
{
return __send_changing_extent_only(ci, ti, get_num_write_same_bios, NULL);
@@ -1484,6 +1494,8 @@
if (bio_op(bio) == REQ_OP_DISCARD)
*result = __send_discard(ci, ti);
+ else if (bio_op(bio) == REQ_OP_SECURE_ERASE)
+ *result = __send_secure_erase(ci, ti);
else if (bio_op(bio) == REQ_OP_WRITE_SAME)
*result = __send_write_same(ci, ti);
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES)
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 1e2426c..019e2ef 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -268,6 +268,12 @@
unsigned num_discard_bios;
/*
+ * The number of secure erase bios that will be submitted to the target.
+ * The bio number can be accessed with dm_bio_get_target_bio_nr.
+ */
+ unsigned num_secure_erase_bios;
+
+ /*
* The number of WRITE SAME bios that will be submitted to the target.
* The bio number can be accessed with dm_bio_get_target_bio_nr.
*/