tree 33f5db6cbb292d6ea9126c5695a2ab5a900728fd
parent db25e8e32d0c080d7b4e3baad4efe132410a5ee6
author Daniel Rosenberg <drosen@google.com> 1617861994 -0700
committer Daniel Rosenberg <drosen@google.com> 1618289526 -0700

libsnapshot: Zero out leftover ops in CowWriter

When opening in append mode, we could write less than what was present
before. This could result in data blocks referencing beyond the end of
the file, or partially written ops. Zeroing these out will prevent
invalid leftovers from potentially causing confusion.

Bug: 183985866
Test: cow_api_test
Change-Id: I56f0218f3ea5b83c0614d1b86e81a4ca885f5c5e