update_engine resize dynamic partitions during OTA.
update_engine uses device mapper to resize dynamic partitions
before opening the devices to apply the update.
* DeltaPerformer calls BootControlInterface::InitPartitionMetadata
when parsing the update manifest. The implementation for
BootControlAndroid::InitPartitionMetadata does the following
if sizes for dynamic partitions are incorrect (assuming updating
from slot A to B):
* Load metadata from metadata slot A
* Delete all extents of partitions at slot B (with _b suffix)
* Add extents for partitions at slot B
* Write metadata to metadata slot B
* Re-map all partitions at slot B using metadata slot B with
force_writable = true
* BootControlAndroid::GetPartitionDevice() checks device-mapper
before returning static partitions.
* PostinstallRunnerAction::Cleanup calls BootControlInterface::Cleanup
which unmaps all partitions at slot B.
A partition "foo" is considered dynamic if foo_a exists as a dynamic
partition OR foo_b does NOT exist as a static partition.
Bug: 110717529
Test: manual ota
Test: update_engine_unittests --gtest_filter=*BootControlAndroid*
Change-Id: I50f410b486a874242663624801c3694151bdda18
diff --git a/common/boot_control_interface.h b/common/boot_control_interface.h
index 659b388..776333c 100644
--- a/common/boot_control_interface.h
+++ b/common/boot_control_interface.h
@@ -18,6 +18,7 @@
#define UPDATE_ENGINE_COMMON_BOOT_CONTROL_INTERFACE_H_
#include <climits>
+#include <map>
#include <string>
#include <base/callback.h>
@@ -32,6 +33,7 @@
class BootControlInterface {
public:
using Slot = unsigned int;
+ using PartitionSizes = std::map<std::string, uint64_t>;
static const Slot kInvalidSlot = UINT_MAX;
@@ -77,6 +79,17 @@
// of the operation.
virtual bool MarkBootSuccessfulAsync(base::Callback<void(bool)> callback) = 0;
+ // Initialize metadata of underlying partitions for a given |slot|.
+ // Ensure that partitions at the specified |slot| has a given size, as
+ // specified by |partition_sizes|. |partition_sizes| has the format:
+ // {"vendor": 524288000, "system": 2097152000, ...}; values must be
+ // aligned to the logical block size of the super partition.
+ virtual bool InitPartitionMetadata(Slot slot,
+ const PartitionSizes& partition_sizes) = 0;
+
+ // Do necessary clean-up operations after the whole update.
+ virtual void Cleanup() = 0;
+
// Return a human-readable slot name used for logging.
static std::string SlotName(Slot slot) {
if (slot == kInvalidSlot)