tree 075bc05ab6ca89a36d01f60ffa76fb23faea6834
parent 35bbf11ec12a241c9fc4bd3f172217b7aa27f9b2
author Daniel Rosenberg <drosen@google.com> 1625098348 -0700
committer Daniel Rosenberg <drosen@google.com> 1627703086 -0700

snapuserd: Add support for Xor ops in snapuserd

This adds the ability to read the blocks corresponding to xor operations
from snapuserd. Xor Operations should be treated the same as copy
operations during the merge, but before their data is written to disk,
it must be xor'ed against the operation's data. For the purposes of
readahead, this acts as a copy op. Post readahead, it acts more like a
replace op.

Change-Id: I7d74bbdd43bfc5277ef4c8aade57dd375be9180a
Bug: 177104308
Test: vts_libsnapshot_test and cow_snapuserd_test