fs/nvs: Speed Improvement
NVS with modified flash layout. At the end of a sector a special ate is
placed that points to the last ate that was written. This special ate
is written when a sector is closed. This allows nvs to travel through
the fs much quicker as it doesn't have to search for the last ate in
a sector.
This modification also speeds up the nvs_init procedure that was very
slow on external (spi) flash.
Remark: As the layout of data in flash is changed old data in the flash
cannot be recovered. It is advised to erase the nvs flash area before
using the changed nvs.
Modification after review by @nvlsianpu applied
Modification after review by @aurel32:
_nvs_prev_ate(): provide a backup search of a valid ate when the sector
close_ate has a bad CRC8. Tested on nrf81522 by making flash writing
bad data to the sector closing ate. Also validated that if a valid ate
is overwritten the filesystem keeps working.
_nvs_gc(): return error if _nvs_flash_cmp_const() is < 0.
Signed-off-by: Laczen JMS <laczenjms@gmail.com>
1 file changed
