snapshotctl: fsync after writing every 1MB buffer



Sync writes after every 1MB instead of flushing at the end.

Bug: 299011882
Test: Boot device off snapshots
Change-Id: If91168ec92c2b2995bdf296ea1c7d4c261b12411
Signed-off-by: Akilesh Kailash <akailash@google.com>

parent 0ca4e8f4

fs_mgr/libsnapshot/snapshotctl.cpp

+5 −1

Original line number	Diff line number	Diff line
		@@ -227,8 +227,12 @@ bool MapSnapshots::WriteSnapshotPatch(std::string cow_device, std::string patch)
		if (file_offset >= dev_sz) {
		break;
		}

		if (fsync(cfd.get()) < 0) {
		PLOG(ERROR) << "Fsync failed at offset: " << file_offset << " size: " << to_read;
		return false;
		}
		}
		fsync(cfd.get());
		return true;
		}