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Renamed cache_size -> buffer_size

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This makes littlefs's usage of the term "cache" an entirely internal
concept and hopefully avoids some confusion about the usefulness of
throwing RAM > block_size at these buffers.

The term cache isn't entirely inaccurate, these buffers do act as
single-line caches, however more often the term cache is used to
describe multi-line caches. Maybe this will be added in littlefs's
future, but the code-size cost makes this change not worth the overhead
at the moment.
This commit is contained in:
Christopher Haster
2020-11-26 15:27:01 -06:00
parent aa46bb68ca
commit 499083765c
7 changed files with 33 additions and 33 deletions
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12
lfs.h
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@@ -178,12 +178,12 @@ struct lfs_cfg {
// 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
// cache per file. Larger caches can improve performance by storing more
// Size of internal buffers used to cache slices of blocks in RAM.
// The littlefs needs a read buffer, a program buffer, and one additional
// buffer per file. Larger buffers can improve performance by storing more
// data and reducing the number of disk accesses. Must be a multiple of
// the read and program sizes, and a factor of the block size.
lfs_size_t cache_size;
lfs_size_t buffer_size;
// Size of the lookahead buffer in bytes. A larger lookahead buffer
// increases the number of blocks found during an allocation pass. The
@@ -249,8 +249,8 @@ int lfs_bd_sync(void);
#ifndef LFS_BLOCK_CYCLES
#error "LFS_STATICCFG requires LFS_BLOCK_CYCLES"
#endif
#ifndef LFS_CACHE_SIZE
#error "LFS_STATICCFG requires LFS_CACHE_SIZE"
#ifndef LFS_BUFFER_SIZE
#error "LFS_STATICCFG requires LFS_BUFFER_SIZE"
#endif
#ifndef LFS_LOOKAHEAD_SIZE
#error "LFS_STATICCFG requires LFS_LOOKAHEAD_SIZE"