This patch adds DM_TARGET_INTEGRITY flag that specifies that
bio integrity metadata is not inherited but implemented in target itself.
Signed-off-by: Milan Broz <gmazyland@xxxxxxxxx>
---
drivers/md/dm-table.c | 11 +++++++++++
include/linux/device-mapper.h | 6 ++++++
2 files changed, 17 insertions(+)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 0a427de23ed2..95094c133d6c 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -47,6 +47,7 @@ struct dm_table {
bool integrity_supported:1;
bool singleton:1;
bool all_blk_mq:1;
+ unsigned integrity_added:1;
/*
* Indicates the rw permissions for the new logical
@@ -725,6 +726,9 @@ int dm_table_add_target(struct dm_table *t, const char *type,
t->immutable_target_type = tgt->type;
}
+ if (dm_target_has_integrity(tgt->type))
+ t->integrity_added = 1;
+
tgt->table = t;
tgt->begin = start;
tgt->len = len;
@@ -1168,6 +1172,10 @@ static int dm_table_register_integrity(struct dm_table *t)
struct mapped_device *md = t->md;
struct gendisk *template_disk = NULL;
+ /* If target handles integrity itself do not register it here. */
+ if (t->integrity_added)
+ return 0;
+
template_disk = dm_table_get_integrity_disk(t);
if (!template_disk)
return 0;
@@ -1394,6 +1402,9 @@ static void dm_table_verify_integrity(struct dm_table *t)
{
struct gendisk *template_disk = NULL;
+ if (t->integrity_added)
+ return;
+
if (t->integrity_supported) {
/*
* Verify that the original integrity profile
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index ef7962e84444..b508e8169133 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -224,6 +224,12 @@ struct target_type {
*/
typedef unsigned (*dm_num_write_bios_fn) (struct dm_target *ti, struct bio *bio);
+/*
+ * A target implements own bio data integrity.
+ */
+#define DM_TARGET_INTEGRITY 0x00000010
+#define dm_target_has_integrity(type) ((type)->features & DM_TARGET_INTEGRITY)
+
struct dm_target {
struct dm_table *table;
struct target_type *type;
--
2.11.0
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
