From e0384bbc69dea873757619f17e2ae19473444a5a Mon Sep 17 00:00:00 2001
From: David Anderson <dvander@google.com>
Date: Thu, 19 Jul 2018 12:27:21 -0700
Subject: [PATCH] fs_mgr: Remove early prototype code.

This early code is no longer needed now that logical partitions can be
created and flashed normally.

Bug: 79173901
Test: N/A
Change-Id: I393ef23b3d3ce1cd9c80833358051838d0e9f333
---
 fs_mgr/fs_mgr_dm_linear.cpp       | 27 ---------------------------
 fs_mgr/include/fs_mgr_dm_linear.h | 22 ----------------------
 init/init_first_stage.cpp         | 20 --------------------
 3 files changed, 69 deletions(-)

diff --git a/fs_mgr/fs_mgr_dm_linear.cpp b/fs_mgr/fs_mgr_dm_linear.cpp
index 5159b4cd4..28e910ba2 100644
--- a/fs_mgr/fs_mgr_dm_linear.cpp
+++ b/fs_mgr/fs_mgr_dm_linear.cpp
@@ -50,33 +50,6 @@ using DmTarget = android::dm::DmTarget;
 using DmTargetZero = android::dm::DmTargetZero;
 using DmTargetLinear = android::dm::DmTargetLinear;
 
-static bool CreateDmDeviceForPartition(DeviceMapper& dm, const LogicalPartition& partition) {
-    DmTable table;
-    for (const auto& extent : partition.extents) {
-        table.AddTarget(std::make_unique<DmTargetLinear>(extent));
-    }
-    if (!dm.CreateDevice(partition.name, table)) {
-        return false;
-    }
-    LINFO << "Created device-mapper device: " << partition.name;
-    return true;
-}
-
-bool CreateLogicalPartitions(const LogicalPartitionTable& table) {
-    DeviceMapper& dm = DeviceMapper::Instance();
-    for (const auto& partition : table.partitions) {
-        if (!CreateDmDeviceForPartition(dm, partition)) {
-            LOG(ERROR) << "could not create dm-linear device for partition: " << partition.name;
-            return false;
-        }
-    }
-    return true;
-}
-
-std::unique_ptr<LogicalPartitionTable> LoadPartitionsFromDeviceTree() {
-    return nullptr;
-}
-
 static bool CreateDmTable(const std::string& block_device, const LpMetadata& metadata,
                           const LpMetadataPartition& partition, DmTable* table) {
     uint64_t sector = 0;
diff --git a/fs_mgr/include/fs_mgr_dm_linear.h b/fs_mgr/include/fs_mgr_dm_linear.h
index 3b0c791bc..42af9d002 100644
--- a/fs_mgr/include/fs_mgr_dm_linear.h
+++ b/fs_mgr/include/fs_mgr_dm_linear.h
@@ -37,28 +37,6 @@
 namespace android {
 namespace fs_mgr {
 
-struct LogicalPartition {
-    std::string name;
-    std::vector<android::dm::DmTargetLinear> extents;
-};
-
-struct LogicalPartitionTable {
-    // List of partitions in the partition table.
-    std::vector<LogicalPartition> partitions;
-};
-
-// Load a dm-linear table from the device tree if one is available; otherwise,
-// return null.
-std::unique_ptr<LogicalPartitionTable> LoadPartitionsFromDeviceTree();
-
-// Create device-mapper devices for the given partition table.
-//
-// On success, two devices nodes will be created for each partition, both
-// pointing to the same device:
-//   /dev/block/dm-<N> where N is a sequential ID assigned by device-mapper.
-//   /dev/block/dm-<name> where |name| is the partition name.
-//
-bool CreateLogicalPartitions(const LogicalPartitionTable& table);
 bool CreateLogicalPartitions(const std::string& block_device);
 
 }  // namespace fs_mgr
diff --git a/init/init_first_stage.cpp b/init/init_first_stage.cpp
index a24a9a239..0ee020384 100644
--- a/init/init_first_stage.cpp
+++ b/init/init_first_stage.cpp
@@ -40,7 +40,6 @@
 #include "util.h"
 
 using android::base::Timer;
-using android::fs_mgr::LogicalPartitionTable;
 
 namespace android {
 namespace init {
@@ -75,7 +74,6 @@ class FirstStageMount {
     bool need_dm_verity_;
 
     std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> device_tree_fstab_;
-    std::unique_ptr<LogicalPartitionTable> dm_linear_table_;
     std::string lp_metadata_partition_;
     std::vector<fstab_rec*> mount_fstab_recs_;
     std::set<std::string> required_devices_partition_names_;
@@ -150,10 +148,6 @@ FirstStageMount::FirstStageMount()
         LOG(INFO) << "Failed to read fstab from device tree";
     }
 
-    if (IsDmLinearEnabled()) {
-        dm_linear_table_ = android::fs_mgr::LoadPartitionsFromDeviceTree();
-    }
-
     auto boot_devices = fs_mgr_get_boot_devices();
     device_handler_ =
         std::make_unique<DeviceHandler>(std::vector<Permissions>{}, std::vector<SysfsPermissions>{},
@@ -195,15 +189,6 @@ bool FirstStageMount::GetBackingDmLinearDevices() {
     }
 
     required_devices_partition_names_.emplace(LP_METADATA_PARTITION_NAME);
-
-    if (dm_linear_table_) {
-        for (const auto& partition : dm_linear_table_->partitions) {
-            for (const auto& extent : partition.extents) {
-                const std::string& partition_name = android::base::Basename(extent.block_device());
-                required_devices_partition_names_.emplace(partition_name);
-            }
-        }
-    }
     return true;
 }
 
@@ -272,11 +257,6 @@ bool FirstStageMount::CreateLogicalPartitions() {
                    << LP_METADATA_PARTITION_NAME;
         return false;
     }
-    if (dm_linear_table_) {
-        if (!android::fs_mgr::CreateLogicalPartitions(*dm_linear_table_.get())) {
-            return false;
-        }
-    }
     return android::fs_mgr::CreateLogicalPartitions(lp_metadata_partition_);
 }