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Changed block_cycles disable from 0 to -1

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As it is now, block_cycles = 0 disables wear leveling. This was a
mistake as 0 is the "default" value for several other config options.
It's even worse when migrating from v1 as it's easy to miss the addition
of block_cycles and end up with a filesystem that is not actually
wear-leveling.

Clearly, block_cycles = 0 should do anything but disable wear-leveling.

Here, I've changed block_cycles = 0 to assert. Forcing users to set a
value for block_cycles (500 is suggested). block_cycles can be set to -1
to explicitly disable wear leveling if desired.
This commit is contained in:
Christopher Haster
2019-07-17 17:05:20 -05:00
parent abd90cb84c
commit 53a6e04712
2 changed files with 11 additions and 6 deletions
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9
lfs.h
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@@ -190,9 +190,12 @@ struct lfs_config {
// Number of erasable blocks on the device.
lfs_size_t block_count;
// Number of erase cycles before we should move data to another block.
// May be zero, in which case no block-level wear-leveling is performed.
uint32_t block_cycles;
// Number of erase cycles before we should move logs to another block.
// Suggested values are in the range 100-1000, with large values having
// better performance at the cost of less consistent wear distribution.
//
// Set to -1 to disable block-level wear-leveling.
int32_t block_cycles;
// Size of block caches. Each cache buffers a portion of a block in RAM.
// The littlefs needs a read cache, a program cache, and one additional