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Commit 7e1411ac authored by Tianjie Xu's avatar Tianjie Xu Committed by Automerger Merge Worker
Browse files

Merge "Add function to compare the partitions' extents in metadata" am: d7b4fe95 am: 14bc7fb7 

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1352612

Change-Id: Ic8d47a49fdcd4b602e7ef961f0d0700746a86f99
parents 26e179c0 14bc7fb7

fs_mgr/liblp/builder.cpp

+78 −2
Original line number Diff line number Diff line
@@ -31,6 +31,22 @@ 
namespace android {

namespace fs_mgr {



std::ostream& operator<<(std::ostream& os, const Extent& extent) {

    switch (extent.GetExtentType()) {

        case ExtentType::kZero: {

            os << "type: Zero";

            break;

        }

        case ExtentType::kLinear: {

            auto linear_extent = static_cast<const LinearExtent*>(&extent);

            os << "type: Linear, physical sectors: " << linear_extent->physical_sector()

               << ", end sectors: " << linear_extent->end_sector();

            break;

        }

    }

    return os;

}



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

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

        LERROR << "Extent references unknown block device.";
@@ -41,6 +57,17 @@ bool LinearExtent::AddTo(LpMetadata* out) const { 
    return true;

}



bool LinearExtent::operator==(const android::fs_mgr::Extent& other) const {

    if (other.GetExtentType() != ExtentType::kLinear) {

        return false;

    }



    auto other_ptr = static_cast<const LinearExtent*>(&other);

    return num_sectors_ == other_ptr->num_sectors_ &&

           physical_sector_ == other_ptr->physical_sector_ &&

           device_index_ == other_ptr->device_index_;

}



bool LinearExtent::OverlapsWith(const LinearExtent& other) const {

    if (device_index_ != other.device_index()) {

        return false;
@@ -64,6 +91,10 @@ bool ZeroExtent::AddTo(LpMetadata* out) const { 
    return true;

}



bool ZeroExtent::operator==(const android::fs_mgr::Extent& other) const {

    return other.GetExtentType() == ExtentType::kZero && num_sectors_ == other.num_sectors();

}



Partition::Partition(std::string_view name, std::string_view group_name, uint32_t attributes)

    : name_(name), group_name_(group_name), attributes_(attributes), size_(0) {}
@@ -518,7 +549,7 @@ Partition* MetadataBuilder::AddPartition(std::string_view name, std::string_view 
    return partitions_.back().get();

}



Partition* MetadataBuilder::FindPartition(std::string_view name) {

Partition* MetadataBuilder::FindPartition(std::string_view name) const {

    for (const auto& partition : partitions_) {

        if (partition->name() == name) {

            return partition.get();
@@ -527,7 +558,7 @@ Partition* MetadataBuilder::FindPartition(std::string_view name) { 
    return nullptr;

}



PartitionGroup* MetadataBuilder::FindGroup(std::string_view group_name) {

PartitionGroup* MetadataBuilder::FindGroup(std::string_view group_name) const {

    for (const auto& group : groups_) {

        if (group->name() == group_name) {

            return group.get();
@@ -1270,5 +1301,50 @@ uint64_t MetadataBuilder::logical_block_size() const { 
    return geometry_.logical_block_size;

}



bool MetadataBuilder::VerifyExtentsAgainstSourceMetadata(

        const MetadataBuilder& source_metadata, uint32_t source_slot_number,

        const MetadataBuilder& target_metadata, uint32_t target_slot_number,

        const std::vector<std::string>& partitions) {

    for (const auto& base_name : partitions) {

        // Find the partition in metadata with the slot suffix.

        auto target_partition_name = base_name + SlotSuffixForSlotNumber(target_slot_number);

        const auto target_partition = target_metadata.FindPartition(target_partition_name);

        if (!target_partition) {

            LERROR << "Failed to find partition " << target_partition_name << " in metadata slot "

                   << target_slot_number;

            return false;

        }



        auto source_partition_name = base_name + SlotSuffixForSlotNumber(source_slot_number);

        const auto source_partition = source_metadata.FindPartition(source_partition_name);

        if (!source_partition) {

            LERROR << "Failed to find partition " << source_partition << " in metadata slot "

                   << source_slot_number;

            return false;

        }



        // We expect the partitions in the target metadata to have the identical extents as the

        // one in the source metadata. Because they are copied in NewForUpdate.

        if (target_partition->extents().size() != source_partition->extents().size()) {

            LERROR << "Extents count mismatch for partition " << base_name << " target slot has "

                   << target_partition->extents().size() << ", source slot has "

                   << source_partition->extents().size();

            return false;

        }



        for (size_t i = 0; i < target_partition->extents().size(); i++) {

            const auto& src_extent = *source_partition->extents()[i];

            const auto& tgt_extent = *target_partition->extents()[i];

            if (tgt_extent != src_extent) {

                LERROR << "Extents " << i << " is different for partition " << base_name;

                LERROR << "tgt extent " << tgt_extent << "; src extent " << src_extent;

                return false;

            }

        }

    }



    return true;

}



}  // namespace fs_mgr

}  // namespace android

fs_mgr/liblp/builder_test.cpp

+40 −12
Original line number Diff line number Diff line
@@ -947,9 +947,10 @@ static Interval ToInterval(const std::unique_ptr<Extent>& extent) { 
}



static void AddPartition(const std::unique_ptr<MetadataBuilder>& builder,

                         const std::string& partition_name, uint64_t num_sectors,

                         uint64_t start_sector, std::vector<Interval>* intervals) {

    Partition* p = builder->AddPartition(partition_name, "group", 0);

                         const std::string& partition_name, const std::string& group_name,

                         uint64_t num_sectors, uint64_t start_sector,

                         std::vector<Interval>* intervals = nullptr) {

    Partition* p = builder->AddPartition(partition_name, group_name, 0);

    ASSERT_NE(p, nullptr);

    ASSERT_TRUE(builder->AddLinearExtent(p, "super", num_sectors, start_sector));

    ASSERT_EQ(p->extents().size(), 1);
@@ -977,17 +978,17 @@ TEST_F(BuilderTest, CollidedExtents) { 
    ASSERT_TRUE(builder->AddGroup("group", 0));



    std::vector<Interval> old_intervals;

    AddPartition(builder, "system", 10229008, 2048, &old_intervals);

    AddPartition(builder, "test_a", 648, 12709888, &old_intervals);

    AddPartition(builder, "test_b", 625184, 12711936, &old_intervals);

    AddPartition(builder, "test_c", 130912, 13338624, &old_intervals);

    AddPartition(builder, "test_d", 888, 13469696, &old_intervals);

    AddPartition(builder, "test_e", 888, 13471744, &old_intervals);

    AddPartition(builder, "test_f", 888, 13475840, &old_intervals);

    AddPartition(builder, "test_g", 888, 13477888, &old_intervals);

    AddPartition(builder, "system", "group", 10229008, 2048, &old_intervals);

    AddPartition(builder, "test_a", "group", 648, 12709888, &old_intervals);

    AddPartition(builder, "test_b", "group", 625184, 12711936, &old_intervals);

    AddPartition(builder, "test_c", "group", 130912, 13338624, &old_intervals);

    AddPartition(builder, "test_d", "group", 888, 13469696, &old_intervals);

    AddPartition(builder, "test_e", "group", 888, 13471744, &old_intervals);

    AddPartition(builder, "test_f", "group", 888, 13475840, &old_intervals);

    AddPartition(builder, "test_g", "group", 888, 13477888, &old_intervals);



    // Don't track the first vendor interval, since it will get extended.

    AddPartition(builder, "vendor", 2477920, 10231808, nullptr);

    AddPartition(builder, "vendor", "group", 2477920, 10231808, nullptr);



    std::vector<Interval> new_intervals;
@@ -1066,3 +1067,30 @@ TEST_F(BuilderTest, ResizeOverflow) { 
    ASSERT_NE(p, nullptr);

    ASSERT_FALSE(builder->ResizePartition(p, 18446744073709551615ULL));

}



TEST_F(BuilderTest, VerifyExtent) {

    auto source_builder = MetadataBuilder::New(4096 * 50, 40960, 2);

    ASSERT_NE(source_builder, nullptr);

    ASSERT_TRUE(source_builder->AddGroup("test_group_a", 40960));

    ASSERT_TRUE(source_builder->AddGroup("test_group_b", 40960));

    AddPartition(source_builder, "system_a", "test_group_a", 8192, 2048);

    AddPartition(source_builder, "vendor_a", "test_group_a", 10240, 10240);

    AddPartition(source_builder, "system_b", "test_group_b", 8192, 20480);



    auto target_builder = MetadataBuilder::New(4096 * 50, 40960, 2);

    ASSERT_NE(target_builder, nullptr);

    ASSERT_TRUE(target_builder->AddGroup("test_group_b", 40960));

    AddPartition(target_builder, "system_b", "test_group_b", 8192, 2048);

    AddPartition(target_builder, "vendor_b", "test_group_b", 10240, 10240);



    ASSERT_TRUE(MetadataBuilder::VerifyExtentsAgainstSourceMetadata(

            *source_builder, 0, *target_builder, 1, std::vector<std::string>{"system", "vendor"}));



    target_builder->RemovePartition("vendor_b");

    ASSERT_FALSE(target_builder->VerifyExtentsAgainstSourceMetadata(

            *source_builder, 0, *target_builder, 1, std::vector<std::string>{"vendor"}));



    AddPartition(target_builder, "vendor_b", "test_group_b", 1000, 10240);

    ASSERT_FALSE(target_builder->VerifyExtentsAgainstSourceMetadata(

            *source_builder, 0, *target_builder, 1, std::vector<std::string>{"vendor"}));

}

fs_mgr/liblp/include/liblp/builder.h

+27 −2
Original line number Diff line number Diff line
@@ -42,6 +42,11 @@ static constexpr uint32_t kDefaultBlockSize = 4096; 
// Name of the default group in a metadata.

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



enum class ExtentType {

    kZero,

    kLinear,

};



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

class Extent {

  public:
@@ -50,6 +55,10 @@ class Extent { 


    virtual bool AddTo(LpMetadata* out) const = 0;

    virtual LinearExtent* AsLinearExtent() { return nullptr; }

    virtual ExtentType GetExtentType() const = 0;



    virtual bool operator==(const Extent& other) const = 0;

    virtual bool operator!=(const Extent& other) const { return !(*this == other); }



    uint64_t num_sectors() const { return num_sectors_; }

    void set_num_sectors(uint64_t num_sectors) { num_sectors_ = num_sectors; }
@@ -58,6 +67,8 @@ class Extent { 
    uint64_t num_sectors_;

};



std::ostream& operator<<(std::ostream& os, const Extent& extent);



// This corresponds to a dm-linear target.

class LinearExtent final : public Extent {

  public:
@@ -66,6 +77,9 @@ class LinearExtent final : public Extent { 


    bool AddTo(LpMetadata* metadata) const override;

    LinearExtent* AsLinearExtent() override { return this; }

    ExtentType GetExtentType() const override { return ExtentType::kLinear; }



    bool operator==(const Extent& other) const override;



    uint64_t physical_sector() const { return physical_sector_; }

    uint64_t end_sector() const { return physical_sector_ + num_sectors_; }
@@ -87,6 +101,9 @@ class ZeroExtent final : public Extent { 
    explicit ZeroExtent(uint64_t num_sectors) : Extent(num_sectors) {}



    bool AddTo(LpMetadata* out) const override;

    ExtentType GetExtentType() const override { return ExtentType::kZero; }



    bool operator==(const Extent& other) const override;

};



class PartitionGroup final {
@@ -243,6 +260,14 @@ class MetadataBuilder { 
        return New(device_info, metadata_max_size, metadata_slot_count);

    }



    // Verifies that the given partitions in the metadata have the same extents as the source

    // metadata.

    static bool VerifyExtentsAgainstSourceMetadata(const MetadataBuilder& source_metadata,

                                                   uint32_t source_slot_number,

                                                   const MetadataBuilder& target_metadata,

                                                   uint32_t target_slot_number,

                                                   const std::vector<std::string>& partitions);



    // Define a new partition group. By default there is one group called

    // "default", with an unrestricted size. A non-zero size will restrict the

    // total space used by all partitions in the group.
@@ -267,10 +292,10 @@ class MetadataBuilder { 
    void RemovePartition(std::string_view name);



    // Find a partition by name. If no partition is found, nullptr is returned.

    Partition* FindPartition(std::string_view name);

    Partition* FindPartition(std::string_view name) const;



    // Find a group by name. If no group is found, nullptr is returned.

    PartitionGroup* FindGroup(std::string_view name);

    PartitionGroup* FindGroup(std::string_view name) const;



    // Add a predetermined extent to a partition.

    bool AddLinearExtent(Partition* partition, const std::string& block_device,