Christopher Haster 5fb8fa9f06 Fixed issue with global state updates being lost during relocates ...

Caught during power resilience testing, this was a bug that only occurs
when we need to compact in the middle of a move commit and we find that
the destination block is bad, forcing a relocate.

This series of events would cause littlefs to clear the "gpending" state
in preparation for fixing the move atomically, but this fix never gets
written out because of the relocate.

The fix here is to separate the update to the "gdelta" and "gpending"
state, marking "gdelta" in preparation for the move, but waiting to
update "gpending" until after our commit completes. This keeps our disk
state in sync without prematurely dropping moves.

2019-01-22 21:02:46 -06:00

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