[PATCH v2 06/10] dm-ima: remove new_map from dm_ima_measure_on_device_clear

[Benjamin Marzinski <bmarzins@redhat.com>]

Now that two processes can't modify md->ima in
dm_ima_measure_on_device_clear() at the same time, there's no need to
track if an inactive table was actually removed. We might as well
clean it up unconditionally, on the off chance that a previous
ima measurement failed and left md->ima.inactive_table behind.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
---
 drivers/md/dm-ima.c   | 10 ++++------
 drivers/md/dm-ima.h   |  3 +--
 drivers/md/dm-ioctl.c |  4 +---
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/md/dm-ima.c b/drivers/md/dm-ima.c
index 096c664d855c..75c46b5af3f7 100644
--- a/drivers/md/dm-ima.c
+++ b/drivers/md/dm-ima.c
@@ -549,7 +549,7 @@ void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all,
 /*
  * Measure ima data on table clear.
  */
-void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map,
+void dm_ima_measure_on_table_clear(struct mapped_device *md,
 				   struct dm_ima_context *context)
 {
 	unsigned int l = 0;
@@ -609,11 +609,9 @@ void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map,
 
 	dm_ima_measure_data("dm_table_clear", device_table_data, l, noio);
 
-	if (new_map) {
-		kfree(md->ima.inactive_table.hash);
-		kfree(md->ima.inactive_table.device_metadata);
-		memset(&md->ima.inactive_table, 0, sizeof(md->ima.inactive_table));
-	}
+	kfree(md->ima.inactive_table.hash);
+	kfree(md->ima.inactive_table.device_metadata);
+	memset(&md->ima.inactive_table, 0, sizeof(md->ima.inactive_table));
 
 error:
 	kfree(capacity_str);
diff --git a/drivers/md/dm-ima.h b/drivers/md/dm-ima.h
index 01fa0b89a385..b240e0e4b6a1 100644
--- a/drivers/md/dm-ima.h
+++ b/drivers/md/dm-ima.h
@@ -83,7 +83,7 @@ void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap,
 void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all,
 				     struct dm_ima_context *context,
 				     unsigned int idx);
-void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map,
+void dm_ima_measure_on_table_clear(struct mapped_device *md,
 				   struct dm_ima_context *context);
 void dm_ima_measure_on_device_rename(struct mapped_device *md,
 				     struct dm_ima_context *context);
@@ -108,7 +108,6 @@ static inline void dm_ima_measure_on_device_remove(struct mapped_device *md,
 						   struct dm_ima_context *context,
 						   unsigned int idx) {}
 static inline void dm_ima_measure_on_table_clear(struct mapped_device *md,
-						 bool new_map,
 						 struct dm_ima_context *context) {}
 static inline void dm_ima_measure_on_device_rename(struct mapped_device *md,
 						   struct dm_ima_context *context) {}
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 3da8b33cdc54..b92ec3efff01 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1741,7 +1741,6 @@ static int table_clear(struct file *filp, struct dm_ioctl *param, size_t param_s
 	struct hash_cell *hc;
 	struct mapped_device *md;
 	struct dm_table *old_map = NULL;
-	bool has_new_map = false;
 	struct dm_ima_context *ima_context = NULL;
 
 	dm_ima_alloc_context(&ima_context, true);
@@ -1758,13 +1757,12 @@ static int table_clear(struct file *filp, struct dm_ioctl *param, size_t param_s
 	if (hc->new_map) {
 		old_map = hc->new_map;
 		hc->new_map = NULL;
-		has_new_map = true;
 	}
 
 	dm_ima_init_context(hc, ima_context, false);
 	md = hc->md;
 	up_write(&_hash_lock);
-	dm_ima_measure_on_table_clear(md, has_new_map, ima_context);
+	dm_ima_measure_on_table_clear(md, ima_context);
 	dm_ima_free_context(ima_context);
 
 	param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
-- 
2.53.0