* Revert "Por rt flush_cache tool."

This reverts commit 3bd600b37c5ee613c004c84736ee3cb69434562a.

Review URL: http://codereview.chromium.org/9774


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@5184 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 0 insertions, 63 deletions

diff --git a/base/file_util.h b/base/file_util.h
index 0bdb56d..3df31e4 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -389,10 +389,6 @@ bool RenameFileAndResetSecurityDescriptor(
     const std::wstring& source_file_path,
     const std::wstring& target_file_path);
 
-// Clear a specific file from the system cache. After this call, trying
-// to access this file will result in a cold load from the hard drive.
-bool EvictFileFromSystemCache(const FilePath path);
-
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_
diff --git a/base/file_util_linux.cc b/base/file_util_linux.cc
index d2a6870..f776c91 100644
--- a/base/file_util_linux.cc
+++ b/base/file_util_linux.cc
@@ -72,16 +72,4 @@ bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
   return result;
 }
 
-bool EvictFileFromSystemCache(const FilePath path) {
-  int fd = open(path.value().c_str(), O_RDONLY);
-  if (fd < 0)
-    return false;
-  if (fdatasync(fd) != 0)
-    return false;
-  if (posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) != 0)
-    return false;
-  close(fd);
-  return true;
-}
-
 }  // namespace file_util
diff --git a/base/file_util_mac.mm b/base/file_util_mac.mm
index 0cf63d2..f7f5632 100644
--- a/base/file_util_mac.mm
+++ b/base/file_util_mac.mm
@@ -28,10 +28,4 @@ bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
                    to_path.value().c_str(), NULL, COPYFILE_ALL) == 0);
 }
 
-bool EvictFileFromSystemCache(const FilePath path) {
-  // TODO(port): Implement.
-  NOTIMPLEMENTED();
-  return false;
-}
-
 }  // namespace
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index 5f75544..355bdfd 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -692,45 +692,4 @@ std::wstring FileEnumerator::Next() {
   return (file_type_ & FileEnumerator::FILES) ? cur_file : Next();
 }
 
-bool EvictFileFromSystemCache(const FilePath path) {
-  // Overwrite it with no buffering.
-  ScopedHandle file(CreateFile(path.value().c_str(),
-                               GENERIC_READ | GENERIC_WRITE,
-                               FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
-                               OPEN_EXISTING, FILE_FLAG_NO_BUFFERING, NULL));
-  if (!file.IsValid())
-    return false;
-
-  // Execute in chunks. It could be optimized. We want to do few of these since
-  // these operations will be slow without the cache.
-  char buffer[128 * 1024];
-  int total_bytes = 0;
-  DWORD bytes_read;
-  for (;;) {
-    if (!ReadFile(file, buffer, sizeof(buffer), &bytes_read, NULL))
-      return false;
-    if (bytes_read == 0)
-      break;
-
-    bool final = false;
-    if (bytes_read < sizeof(buffer))
-      final = true;
-
-    DWORD to_write = final ? sizeof(buffer) : bytes_read;
-
-    DWORD actual;
-    SetFilePointer(file, total_bytes, 0, FILE_BEGIN);
-    if (!WriteFile(file, buffer, to_write, &actual, NULL))
-      return false;
-    total_bytes += bytes_read;
-
-    if (final) {
-      SetFilePointer(file, total_bytes, 0, FILE_BEGIN);
-      SetEndOfFile(file);
-      break;
-    }
-  }
-  return true;
-}
-
 }  // namespace file_util