Nikos Tsironis 8fdbfe8d16
dm clone metadata: Use a two phase commit ...
Split the metadata commit in two parts:
1. dm_clone_metadata_pre_commit(): Prepare the current transaction for
committing. After this is called, all subsequent metadata updates,
done through either dm_clone_set_region_hydrated() or
dm_clone_cond_set_range(), will be part of the next transaction.
2. dm_clone_metadata_commit(): Actually commit the current transaction
to disk and start a new transaction.
This is required by the following commit. It allows dm-clone to flush
the destination device after step (1) to ensure that all freshly
hydrated regions, for which we are updating the metadata, are properly
written to non-volatile storage and won't be lost in case of a crash.
Fixes: 7431b7835fstable@vger.kernel.org # v5.4+
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com >
Signed-off-by: Mike Snitzer <snitzer@redhat.com >
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8fdbfe8d16