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Minor improvement to documentation over block_cycles

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Suggested by haneefmubarak
This commit is contained in:
Christopher Haster
2019-07-28 20:42:13 -05:00
parent 53a6e04712
commit 38a2a8d2a3
2 changed files with 11 additions and 6 deletions
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10
lfs.c
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@@ -3192,11 +3192,15 @@ static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
LFS_ASSERT(4*lfs_npw2(0xffffffff / (lfs->cfg->block_size-2*4)) LFS_ASSERT(4*lfs_npw2(0xffffffff / (lfs->cfg->block_size-2*4))
<= lfs->cfg->block_size); <= lfs->cfg->block_size);
// block_cycles = 0 is no longer supported, must either set a number // block_cycles = 0 is no longer supported.
// of erase cycles before moving logs to another block (~500 suggested), //
// or explicitly disable wear-leveling with -1. // block_cycles is the number of erase cycles before littlefs evicts
// metadata logs as a part of wear leveling. Suggested values are in the
// range of 100-1000, or set block_cycles to -1 to disable block-level
// wear-leveling.
LFS_ASSERT(lfs->cfg->block_cycles != 0); LFS_ASSERT(lfs->cfg->block_cycles != 0);
// setup read cache // setup read cache
if (lfs->cfg->read_buffer) { if (lfs->cfg->read_buffer) {
lfs->rcache.buffer = lfs->cfg->read_buffer; lfs->rcache.buffer = lfs->cfg->read_buffer;

7
lfs.h
View File

@@ -190,9 +190,10 @@ struct lfs_config {
// Number of erasable blocks on the device. // Number of erasable blocks on the device.
lfs_size_t block_count; lfs_size_t block_count;
// Number of erase cycles before we should move logs to another block. // Number of erase cycles before littlefs evicts metadata logs and moves
// Suggested values are in the range 100-1000, with large values having // the metadata to another block. Suggested values are in the
// better performance at the cost of less consistent wear distribution. // 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. // Set to -1 to disable block-level wear-leveling.
int32_t block_cycles; int32_t block_cycles;