make checkpointing work on ext4 (786d0b27) · Commits · e / os / android_system_core

fs_mgr/fs_mgr.cpp

+37 −4

Original line number	Diff line number	Diff line
		@@ -840,7 +840,7 @@ bool fs_mgr_update_logical_partition(struct fstab_rec* rec) {
		}

		bool fs_mgr_update_checkpoint_partition(struct fstab_rec* rec) {
		if (fs_mgr_is_checkpoint(rec)) {
		if (fs_mgr_is_checkpoint_fs(rec)) {
		if (!strcmp(rec->fs_type, "f2fs")) {
		std::string opts(rec->fs_options);

		@@ -850,10 +850,43 @@ bool fs_mgr_update_checkpoint_partition(struct fstab_rec* rec) {
		} else {
		LERROR << rec->fs_type << " does not implement checkpoints.";
		}
		} else if (rec->fs_mgr_flags & MF_CHECKPOINT_BLK) {
		LERROR << "Block based checkpoint not implemented.";
		} else if (fs_mgr_is_checkpoint_blk(rec)) {
		call_vdc({"checkpoint", "restoreCheckpoint", rec->blk_device});

		android::base::unique_fd fd(
		TEMP_FAILURE_RETRY(open(rec->blk_device, O_RDONLY \| O_CLOEXEC)));
		if (!fd) {
		PERROR << "Cannot open device " << rec->blk_device;
		return false;
		}

		uint64_t size = get_block_device_size(fd) / 512;
		if (!size) {
		PERROR << "Cannot get device size";
		return false;
		}

		android::dm::DmTable table;
		if (!table.AddTarget(
		std::make_unique<android::dm::DmTargetBow>(0, size, rec->blk_device))) {
		LERROR << "Failed to add Bow target";
		return false;
		}

		DeviceMapper& dm = DeviceMapper::Instance();
		if (!dm.CreateDevice("bow", table)) {
		PERROR << "Failed to create bow device";
		return false;
		}

		std::string name;
		if (!dm.GetDmDevicePathByName("bow", &name)) {
		PERROR << "Failed to get bow device name";
		return false;
		}

		rec->blk_device = strdup(name.c_str());
		}
		return true;
		}

+2 −0

Original line number	Diff line number	Diff line
		@@ -156,6 +156,8 @@ class DmTargetVerityString final : public DmTarget {
		std::string target_string_;
		};

		// dm-bow is the backup on write target that can provide checkpoint capability
		// for file systems that do not support checkpoints natively
		class DmTargetBow final : public DmTarget {
		public:
		DmTargetBow(uint64_t start, uint64_t length, const std::string& target_string)

+1 −0

Original line number	Diff line number	Diff line
		@@ -400,6 +400,7 @@ on post-fs-data

		# Make sure we have the device encryption key.
		start vold
		exec - system system -- /system/bin/vdc checkpoint prepareDriveForCheckpoint /data
		installkey /data

		# Start bootcharting as soon as possible after the data partition is