tree a055c93def5a0cccf436a735ec25f436a27143ea
parent f413fe59759c73d6a5624c2158260b4302d01fe2
author Darin Petkov <petkov@chromium.org> 1366893969 +0200
committer ChromeBot <chrome-bot@google.com> 1367326872 -0700

AU: Handle moving of sparse block extents correctly in DeltaPerformer.

Rather than reading from sparse holes, just reset the buffer with zeros. Drop
writes to sparse holes (and DCHECK that the data to be written is all zeros).

This patch also adds the following tests:

- Move a file of zeros into a sparse file.
- Move a sparse file into a file of zeros.
- Move a partially sparse file.

BUG=chromium:196378
TEST=unit tests

Change-Id: Idab8d44b391fbe7714c7fd53f7f383c9bf81edc1
Reviewed-on: https://gerrit.chromium.org/gerrit/49172
Commit-Queue: Darin Petkov <petkov@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>