Adding flushing of files on chromeos, so that when something is downloaded, its written out ot disk shortly after finish downloading.

BUG=chromium-os:2661
TEST=none
Review URL: http://codereview.chromium.org/2770002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49461 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 17 insertions, 0 deletions

diff --git a/net/base/file_stream_posix.cc b/net/base/file_stream_posix.cc
index 8a0f2e3..2036260 100644
--- a/net/base/file_stream_posix.cc
+++ b/net/base/file_stream_posix.cc
@@ -70,6 +70,16 @@ int WriteFile(base::PlatformFile file, const char* buf, int buf_len) {
   return res;
 }
 
+// FlushFile() is a simple wrapper around fsync() that handles EINTR signals and
+// calls MapErrorCode() to map errno to net error codes.  It tries to flush to
+// completion.
+int FlushFile(base::PlatformFile file) {
+  ssize_t res = HANDLE_EINTR(fsync(file));
+  if (res == -1)
+    return MapErrorCode(errno);
+  return res;
+}
+
 // BackgroundReadTask is a simple task that reads a file and then runs
 // |callback|.  AsyncContext will post this task to the WorkerPool.
 class BackgroundReadTask : public Task {
@@ -445,6 +455,13 @@ int FileStream::Write(
   }
 }
 
+int FileStream::Flush() {
+  if (!IsOpen())
+    return ERR_UNEXPECTED;
+
+  return FlushFile(file_);
+}
+
 int64 FileStream::Truncate(int64 bytes) {
   if (!IsOpen())
     return ERR_UNEXPECTED;