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3 Commits (a947f4845cb754cafa2efdb232fb1c706fe8575f)

Author SHA1 Message Date
Lingkai Dong aedc6009ea TDBStore: call `BlockDevice::erase()` regarless of erase value 
From the documentations of `BlockDevice::get_erase_value()`:

    -1 if you can't rely on the value of the erased storage

and `BlockDevice::program()`:

    The blocks must have been erased prior to being programmed

So, `BlockDevice::erase()` should always be called regardless of
erase value.
 2021-04-14 17:19:38 +01:00
Lingkai Dong fb4e5e80b4 TDBStore: optimize erase algorithms 
Currently `TDBStore::offset_in_erase_unit()` and
`TDBStore::check_erase_before_write()` loop through erase units
one-by-one, until the entire range is covered. This is very inefficient
when the erase size is tiny, e.g. one-byte on a non-flash device for
which we use program as erase.

This commit reworks the algorithms, based on the fact that a block
device can erase or program as many units as needed in one go.
 2021-04-14 17:19:38 +01:00
Lingkai Dong c2d6e9146c Turn TDBStore and FileSystemStore into standalone libraries 2020-12-09 17:20:42 +00:00