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Commit 5b4b38ce authored by Yifan Hong's avatar Yifan Hong
Browse files

liblp: Expose kDefaultGroup. 

kDefaultGroup is the 'default' group that is never deleted
and has no size constraints. During a virtual a/b update,
the following series of action happens:
- move partitions out of groups that will be shrunk / deleted
  (into default)
- shrink / delete these groups
- grow / add other groups
- move those partitions to their destination group.

Otherwise, the metadata is inconsistent.

Bug: 138816109
Test: builds

Change-Id: I57cf4b44dda948377c6b3153756f469caa4652bc
parent 04d91871

fs_mgr/liblp/builder.cpp

+0 −3
Original line number Diff line number Diff line
@@ -19,7 +19,6 @@ 
#include <string.h>



#include <algorithm>

#include <string_view>



#include <android-base/unique_fd.h>
@@ -31,8 +30,6 @@ 
namespace android {

namespace fs_mgr {



static constexpr std::string_view kDefaultGroup = "default";



bool LinearExtent::AddTo(LpMetadata* out) const {

    if (device_index_ >= out->block_devices.size()) {

        LERROR << "Extent references unknown block device.";

fs_mgr/liblp/include/liblp/builder.h

+4 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <memory>

#include <optional>

#include <set>

#include <string_view>



#include "liblp.h"

#include "partition_opener.h"
@@ -37,6 +38,9 @@ class LinearExtent; 
static const uint32_t kDefaultPartitionAlignment = 1024 * 1024;

static const uint32_t kDefaultBlockSize = 4096;



// Name of the default group in a metadata.

static constexpr std::string_view kDefaultGroup = "default";



// Abstraction around dm-targets that can be encoded into logical partition tables.

class Extent {

  public: