tree ff867904ea593410a0e6ff14eaad17ce32b1b6fa
parent 86da28a5e61c8e7f47b1998063e43eab6b8e2df6
author Wyatt Hepler <hepler@google.com> 1583968516 -0700
committer Wyatt Hepler <hepler@google.com> 1584116358 -0700

pw_kvs: Remove temp buffer; redundancy changes

- Instead of copying entries to a large working buffer, incrementally
  read and checksum them and then incrementally copy them. Remove the
  working buffer.
- Find space for all redundant entries before writing any of them. This
  ensures that redundancy is maintained when adding entries to a
  mostly-full KVS.
- Update KeyDescriptors immediately after writing the first copy of
  an entry, instead of after attempting to write all copies.
- Eliminate temporary KeyDescriptor objects. Remove the public
  KeyDescriptor constructors, including the default.

Change-Id: Ia3674e260c9ab0fdc01965563343b2cf5da37adf