diff --git a/.gitignore b/.gitignore
index 46dc357..294960a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 build/
+release/
 *.o
 tmp/
 *.log
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index acaa545..6b212a0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -8,4 +8,18 @@ elseif(UNIX) # Linux, BSD etc
   target_link_libraries(fuse-cpp-ramfs fuse)
 endif()
 target_link_libraries(fuse-cpp-ramfs pthread)
+
+add_executable(copy-bench copy_bench.cpp directory.cpp inode.cpp symlink.cpp file.cpp special_inode.cpp fuse_cpp_ramfs.cpp)
+set_property(TARGET copy-bench PROPERTY CXX_STANDARD 17)
+target_compile_definitions(copy-bench PRIVATE FUSE_USE_VERSION=30 _FILE_OFFSET_BITS=64)
+if(APPLE)
+  target_link_libraries(copy-bench osxfuse)
+elseif(UNIX) # Linux, BSD etc
+  target_link_libraries(copy-bench fuse)
+endif()
+find_package(gflags REQUIRED)
+find_package(benchmark REQUIRED)
+target_link_libraries(copy-bench gflags benchmark profiler)
+
 install(TARGETS fuse-cpp-ramfs DESTINATION bin)
+install(TARGETS copy-bench DESTINATION bin)
diff --git a/src/copy_bench.cpp b/src/copy_bench.cpp
new file mode 100644
index 0000000..1e960d8
--- /dev/null
+++ b/src/copy_bench.cpp
@@ -0,0 +1,326 @@
+#define FILE_OFFSET_BITS 64
+#include "common.h"
+
+#define VERIFS2_COPY_BENCH
+#include "inode.hpp"
+#include "file.hpp"
+#include "directory.hpp"
+#include "symlink.hpp"
+#include "special_inode.hpp"
+
+#include <cmath>
+#include <gflags/gflags.h>
+#include <benchmark/benchmark.h>
+#include <gperftools/profiler.h>
+
+DEFINE_int32(inodes, 100000, "Number of inodes to generate");
+DEFINE_int32(fsize_min, 0, "Minimum size of regular file (in bytes)");
+DEFINE_int32(fsize_max, 65536, "Maximum size of regular file (in bytes)");
+DEFINE_int32(dirent_min, 2, "Minimum number of children in each directory");
+DEFINE_int32(dirent_max, 10000, "Max number of children in each directory");
+DEFINE_double(file_ratio, 0.75, "Ratio of regular files");
+DEFINE_double(dir_ratio, 0.15, "Ratio of directories");
+DEFINE_double(symlink_ratio, 0.09, "Ratio of symlinks");
+DEFINE_double(special_ratio, 0.01, "Ratio of special files");
+
+enum benchmark::TimeUnit display_time_unit;
+std::string& toLower(std::string &str) {
+  const int kDiff = 'a' - 'A';
+  for (size_t i = 0; i < str.size(); ++i) {
+    if (str[i] >= 'A' && str[i] <= 'Z')
+      str[i] -= kDiff;
+  }
+  return str;
+}
+bool validate_unit_option(const char *flagname, const std::string &value) {
+  std::string val2 = value;
+  toLower(val2);
+  if (val2 == "ms" || val2 == "millisecond" || val2 == "milliseconds")
+    display_time_unit = benchmark::kMillisecond;
+  else if (val2 == "us" || val2 == "microsecond" || val2 == "microseconds")
+    display_time_unit = benchmark::kMicrosecond;
+  else if (val2 == "ns" || val2 == "nanosecond" || val2 == "nanoseconds")
+    display_time_unit = benchmark::kNanosecond;
+  else if (val2 == "s" || val2 == "second" || val2 == "seconds")
+    display_time_unit = benchmark::kSecond;
+  else
+    return false;
+  return true;
+}
+DEFINE_string(time_unit, "ms", "Unit of time");
+DEFINE_validator(time_unit, &validate_unit_option);
+
+int rand_range(int lower, int upper) {
+  long randval = rand();
+  return (randval % (upper - lower + 1)) + lower;
+}
+
+template <class T>
+T rand_select(std::vector<T> &choices) {
+  int idx = rand_range(0, choices.size() - 1);
+  return choices[idx];
+}
+
+std::string gen_rand_string(int minlen, int maxlen) {
+  static std::string alphabet("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_");
+  int len = rand_range(minlen, maxlen);
+  std::string result;
+  for (int i = 0; i < len; ++i) {
+    result += alphabet[rand_range(0, alphabet.size() - 1)];
+  }
+  return result;
+}
+
+void fill_buf_with_rand(void *buf, size_t size) {
+  int *ptr = (int *)buf;
+  for (size_t i = 0; i < size; i += sizeof(int), ++ptr) {
+    int r = rand();
+    if (size - i >= sizeof(int))
+      *ptr = r;
+    else
+      memcpy(ptr, &r, size - i);
+  }
+}
+
+size_t fill_file(File *f) {
+  int datasize = rand_range(FLAGS_fsize_min, FLAGS_fsize_max);
+  char *data = new char[datasize];
+  fill_buf_with_rand(data, datasize);
+  f->_set_buffer(data);
+  return datasize;
+}
+
+size_t fill_directory(Directory *d) {
+  int nchildren = rand_range(FLAGS_dirent_min, FLAGS_dirent_max);
+  size_t total_size = 0;;
+  for (int i = 0; i < nchildren; ++i) {
+    std::string name = gen_rand_string(1, NAME_MAX);
+    auto it = d->_children().find(name);
+    if (it != d->_children().end()) {
+      i--;
+      continue;
+    }
+    d->_children().insert({name, 0});
+    total_size += name.capacity() + sizeof(std::string) + sizeof(fuse_ino_t) +
+      sizeof(std::_Rb_tree_node_base);
+  }
+  return total_size;
+}
+
+Inode *create_inode() {
+  double rn = (double)rand() / RAND_MAX;
+  Inode *res;
+  size_t total_size = 0; 
+
+  // double file_threshold = 0;
+  double dir_threshold = FLAGS_file_ratio;
+  double symlink_threshold = FLAGS_file_ratio + FLAGS_dir_ratio;
+  double special_threshold = FLAGS_file_ratio + FLAGS_dir_ratio +
+    FLAGS_symlink_ratio;
+
+  if (rn < dir_threshold) {
+    File *file = new File();
+    total_size += fill_file(file) + sizeof(File);
+    res = dynamic_cast<Inode *>(file);
+    res->_attrs().st_mode = S_IFREG;
+  } else if (rn >= dir_threshold && rn < symlink_threshold) {
+    Directory *dir = new Directory(); 
+    total_size += fill_directory(dir) + sizeof(Directory);
+    res = dynamic_cast<Inode *>(dir);
+    res->_attrs().st_mode = S_IFDIR;
+  } else if (rn >= symlink_threshold && rn < special_threshold) {
+    std::string linkpath = gen_rand_string(1, PATH_MAX);
+    SymLink *sym = new SymLink(linkpath);
+    total_size += sizeof(SymLink) + linkpath.capacity();
+    res = dynamic_cast<Inode *>(sym);
+    res->_attrs().st_mode = S_IFLNK;
+  } else if (rn >= special_threshold) {
+    std::vector<SpecialInodeTypes> choices({
+        SPECIAL_INODE_TYPE_NO_BLOCK, SPECIAL_INODE_CHAR_DEV,
+        SPECIAL_INODE_BLOCK_DEV, SPECIAL_INODE_FIFO, SPECIAL_INODE_SOCK});
+    enum SpecialInodeTypes itype = rand_select(choices);
+    SpecialInode *sp = new SpecialInode(itype);
+    total_size += sizeof(SpecialInode);
+    res = dynamic_cast<Inode *>(sp);
+    mode_t mode;
+    switch(itype) {
+      case SPECIAL_INODE_CHAR_DEV:
+        mode = S_IFCHR;
+        break;
+
+      case SPECIAL_INODE_BLOCK_DEV:
+        mode = S_IFBLK;
+        break;
+
+      case SPECIAL_INODE_FIFO:
+        mode = S_IFIFO;
+        break;
+
+      case SPECIAL_INODE_SOCK:
+        mode = S_IFSOCK;
+        break;
+
+      default:
+        mode = 0;
+        break;
+    }
+    res->_attrs().st_mode = mode;
+    res->_attrs().st_dev = 0;
+  }
+  res->_attrs().st_size = total_size;
+
+  return res;
+}
+
+size_t generate_inodes(std::vector<Inode *> &table) {
+  size_t total_size = 0;
+  for (int i = 0; i < FLAGS_inodes; ++i) {
+    Inode *inode = create_inode();
+    table.push_back(inode);
+    total_size += sizeof(Inode *) + inode->Size();
+  }
+  return total_size;
+}
+
+void destroy_inodes(std::vector<Inode *> &table) {
+  for (Inode *inode : table) {
+    delete inode;
+  }
+  table.clear();
+}
+
+void generate_files(std::vector<File> &files, std::vector<Inode *> &ref) {
+  for (Inode *iptr : ref) {
+    /* Determine the total size of this inode */
+    size_t thissize = sizeof(Inode *) + iptr->Size();
+    if (S_ISREG(iptr->_attrs().st_mode)) {
+      thissize += sizeof(File);
+    } else if (S_ISDIR(iptr->_attrs().st_mode)) {
+      thissize += sizeof(Directory);
+    } else if (S_ISLNK(iptr->_attrs().st_mode)) {
+      thissize += sizeof(SymLink);
+    } else {
+      thissize += sizeof(SpecialInode);
+    }
+    /* The size of data buffer */
+    size_t bufsize = (thissize > sizeof(File)) ? thissize - sizeof(File) : 0;
+    void *data = malloc(bufsize);
+    assert(data != nullptr);
+    fill_buf_with_rand(data, bufsize);
+    files.emplace_back(data, bufsize);
+  }
+}
+
+void copy_files(std::vector<File> &dest, const std::vector<File> &src) {
+  dest = src;
+}
+
+void copy_inodes(std::vector<Inode *> &dest, const std::vector<Inode *> &src) {
+  for (size_t i = 0; i < src.size(); ++i) {
+    Inode *src_i = src[i];
+    if (S_ISREG(src_i->_attrs().st_mode)) {
+      File *src_f = dynamic_cast<File *>(src_i);
+      File *dest_f = new File(*src_f);
+      dest.push_back(dynamic_cast<Inode *>(dest_f));
+    } else if (S_ISDIR(src_i->_attrs().st_mode)) {
+      Directory *src_d = dynamic_cast<Directory *>(src_i);
+      Directory *dst_d = new Directory(*src_d);
+      dest.push_back(dynamic_cast<Inode *>(dst_d));
+    } else if (S_ISLNK(src_i->_attrs().st_mode)) {
+      SymLink *src_l = dynamic_cast<SymLink *>(src_i);
+      SymLink *dst_l = new SymLink(*src_l);
+      dest.push_back(dynamic_cast<Inode *>(dst_l));
+    } else {
+      SpecialInode *src_sp = dynamic_cast<SpecialInode *>(src_i);
+      SpecialInode *dst_sp = new SpecialInode(*src_sp);
+      dest.push_back(dynamic_cast<Inode *>(dst_sp));
+    }
+  }
+}
+
+static std::vector<Inode *> source;
+static std::vector<File> files;
+static size_t total_size;
+static void *data;
+
+class CopyBenchTool {
+public:
+  static constexpr double eps = 1e-6;
+  void SetUp() {
+    double total_ratio = FLAGS_file_ratio + FLAGS_dir_ratio +
+      FLAGS_symlink_ratio + FLAGS_special_ratio;
+    if (std::abs(1.0 - total_ratio) > eps) {
+      printf("file_ratio + dir_ratio + symlink_ratio + special_ratio "
+             "must be equal to 1.0.\n");
+      exit(1);
+    }
+
+    setvbuf(stdout, NULL, _IONBF, 0);
+    printf("Generating inode table...");
+    total_size = generate_inodes(source);
+    printf("%zu bytes (%.2f MB)\n", total_size, 1.0 * total_size / 1024 / 1024);
+    printf("Generating a list of files that have the same amount of data...");
+    generate_files(files, source);
+    printf("Done.\n");
+    printf("Generating the same amount of contiguous data...");
+    data = malloc(total_size);
+    int *ptr = (int *)data;
+    for (size_t i = 0; i < total_size; i += sizeof(int), ptr++) {
+      *ptr = rand();
+    }
+    printf("Done.\n");
+  }
+
+  void TearDown() {
+    destroy_inodes(source);
+    free(data);
+  }
+};
+
+static void BM_CopyInodeTable(benchmark::State &state) {
+  for (auto _ : state) {
+    std::vector<Inode *> dest;
+    copy_inodes(dest, source);
+
+    state.PauseTiming();
+    destroy_inodes(dest);
+    state.ResumeTiming();
+  }
+}
+
+static void BM_CopyFiles(benchmark::State &state) {
+  for (auto _ : state) {
+    std::vector<File> dest;
+    copy_files(dest, files);
+
+    state.PauseTiming();
+    dest.clear();
+    state.ResumeTiming();
+  }
+}
+
+static void BM_CopyData(benchmark::State &state) {
+  for (auto _ : state) {
+    void *copy_data = malloc(total_size);
+    memcpy(copy_data, data, total_size);
+
+    state.PauseTiming();
+    free(copy_data);
+    state.ResumeTiming();
+  }
+}
+
+int main(int argc, char **argv) {
+  ::benchmark::Initialize(&argc, argv);
+  gflags::ParseCommandLineFlags(&argc, &argv, false);
+  // The purpose of this is to "use" a function in libprofilee so that the
+  // compiler will always link the library.
+  ProfilerEnable();
+  CopyBenchTool copybench;
+  copybench.SetUp();
+  BENCHMARK(BM_CopyInodeTable)->Unit(display_time_unit);
+  BENCHMARK(BM_CopyFiles)->Unit(display_time_unit);
+  BENCHMARK(BM_CopyData)->Unit(display_time_unit);
+  ::benchmark::RunSpecifiedBenchmarks();
+  copybench.TearDown();
+}
diff --git a/src/directory.hpp b/src/directory.hpp
index dd6f5ec..e8fc884 100644
--- a/src/directory.hpp
+++ b/src/directory.hpp
@@ -31,6 +31,11 @@ class Directory : public Inode {
 public:
     ~Directory() {}
 
+    Directory() {}
+    Directory(const Directory &d) : Inode(d) {
+      m_children = d.m_children;
+    }
+
     void Initialize(fuse_ino_t ino, mode_t mode, nlink_t nlink, gid_t gid, uid_t uid);
     fuse_ino_t _ChildInodeNumberWithName(const std::string &name);
     fuse_ino_t ChildInodeNumberWithName(const std::string &name);
@@ -51,6 +56,13 @@ class Directory : public Inode {
     const std::map<std::string, fuse_ino_t> &Children() { return m_children; }
 
     std::shared_mutex& DirLock() { return childrenRwSem; }
+
+#ifdef VERIFS2_COPY_BENCH
+    /* Only for benchmarking purpose! */
+    std::map<std::string, fuse_ino_t>& _children() {
+      return m_children;
+    }
+#endif
 };
 
 #endif /* directory_hpp */
diff --git a/src/file.hpp b/src/file.hpp
index cf94f2d..d23e44a 100644
--- a/src/file.hpp
+++ b/src/file.hpp
@@ -8,16 +8,51 @@
 class File : public Inode {
 private:
     void *m_buf;
+
+    void copy_from_other(const File &f) {
+      size_t bufsize = f.m_fuseEntryParam.attr.st_size; 
+      m_buf = malloc(bufsize);
+      memcpy(m_buf, f.m_buf, bufsize);
+    }
     
 public:
     File() :
     m_buf(NULL) {}
+
+#ifdef VERIFS2_COPY_BENCH
+    File(void *buf, size_t bufsize) : m_buf(buf) {
+      m_fuseEntryParam.attr.st_size = bufsize;
+    }
+#endif
+
+    File(const File &f) : Inode(f) {
+      copy_from_other(f);
+    }
+
+    File& operator=(const File &f) {
+      if (&f != this) {
+        Inode::operator=(f);
+        copy_from_other(f);
+      }
+      return *this;
+    }
     
     ~File();
     
     int WriteAndReply(fuse_req_t req, const char *buf, size_t size, off_t off);
     int ReadAndReply(fuse_req_t req, size_t size, off_t off);
     int FileTruncate(size_t newSize);
+
+#ifdef VERIFS2_COPY_BENCH
+    /* Only for use for benchmarking purpose! */
+    void _set_buffer(void *buf) {
+      m_buf = buf;
+    }
+
+    void *_get_buffer(void) {
+      return m_buf;
+    }
+#endif
     
 //    size_t Size();
 };
diff --git a/src/inode.hpp b/src/inode.hpp
index 0539e33..7bd3af9 100644
--- a/src/inode.hpp
+++ b/src/inode.hpp
@@ -17,6 +17,13 @@ class Inode {
     std::shared_mutex entryRwSem;
     std::map<std::string, std::pair<void *, size_t> > m_xattr;
     std::shared_mutex xattrRwSem;
+
+    void copy_from_others(const Inode &src) {
+      m_markedForDeletion = src.m_markedForDeletion;
+      m_nlookup.store(src.m_nlookup.load());
+      m_fuseEntryParam = src.m_fuseEntryParam;
+      m_xattr = src.m_xattr;
+    }
     
 public:
     static const size_t BufBlockSize = 512;
@@ -26,6 +33,16 @@ class Inode {
     m_markedForDeletion(false),
     m_nlookup(0)
     {}
+
+    Inode(const Inode &src) {
+      copy_from_others(src);
+    }
+
+    Inode& operator=(const Inode &src) {
+      if (&src != this)
+        copy_from_others(src);
+      return *this;
+    }
     
     virtual ~Inode() = 0;
     
@@ -78,6 +95,13 @@ class Inode {
     fuse_ino_t GetIno() { return m_fuseEntryParam.attr.st_ino; }
     
     bool Forgotten() { return m_nlookup == 0; }
+
+#ifdef VERIFS2_COPY_BENCH
+    /* Only for benchmarking purposes */
+    struct stat& _attrs() {
+      return m_fuseEntryParam.attr;
+    }
+#endif
 };
 
 #endif /* inode_hpp */
diff --git a/src/special_inode.hpp b/src/special_inode.hpp
index b540ab7..b3e318f 100644
--- a/src/special_inode.hpp
+++ b/src/special_inode.hpp
@@ -19,6 +19,10 @@ class SpecialInode : public Inode {
 public:
     SpecialInode(enum SpecialInodeTypes type, dev_t dev = 0);
     ~SpecialInode() {};
+
+    SpecialInode(const SpecialInode &sp) : Inode(sp) {
+      m_type = sp.m_type;
+    }
     
     int WriteAndReply(fuse_req_t req, const char *buf, size_t size, off_t off);
     
diff --git a/src/symlink.hpp b/src/symlink.hpp
index 84f179e..550eb7c 100644
--- a/src/symlink.hpp
+++ b/src/symlink.hpp
@@ -12,6 +12,10 @@ class SymLink : public Inode {
 public:
     SymLink(const std::string &link) :
     m_link(link) {}
+
+    SymLink(const SymLink &sym) : Inode(sym) {
+      m_link = sym.m_link;
+    }
     
     ~SymLink() {};