tree b71ba75a1c4f096377e14ddf17c806aa6807915f
parent 028303d52365ef2cf3d5a00d2f8df051f6e640e5
author David Anderson <dvander@google.com> 1623802140 -0700
committer David Anderson <dvander@google.com> 1624500721 -0700

Perform a consistency check before deleting snapshots.

If for some reason the COW state is not fully synced to disk, but
dm-snapshot has flushed its pending merges, we do not want to delete
snapshots. Doing so could potentially leave blocks unmerged.

This situation is quite unexpected so we label it as a merge failure.
The device can recover by completely syncing the COW state, and then
rebooting, which will attempt to make forward progress on the merge.

Bug: 190582627
Test: vts_libsnapshot_test
      full OTA on bramble
      incremental OTA on bramble
Change-Id: Ib887f1d9e4397a712ed2f800cc1222cf9305a039
Merged-In: Ib887f1d9e4397a712ed2f800cc1222cf9305a039