// reads from spi flash or the cache
s32_t spiffs_phys_rd(
spiffs *fs,
u8_t op,
spiffs_file fh,
u32_t addr,
u32_t len,
u8_t *dst) {
(void)fh;
s32_t res = SPIFFS_OK;
spiffs_cache *cache = spiffs_get_cache(fs);
spiffs_cache_page *cp = spiffs_cache_page_get(fs, SPIFFS_PADDR_TO_PAGE(fs, addr));
cache->last_access++;
if (cp) {
// we've already got one, you see
#if SPIFFS_CACHE_STATS
fs->cache_hits++;
#endif
cp->last_access = cache->last_access;
u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
} else {
if ((op & SPIFFS_OP_TYPE_MASK) == SPIFFS_OP_T_OBJ_LU2) {
// for second layer lookup functions, we do not cache in order to prevent shredding
return SPIFFS_HAL_READ(fs, addr, len, dst);
}
#if SPIFFS_CACHE_STATS
fs->cache_misses++;
#endif
// this operation will always free one cache page (unless all already free),
// the result code stems from the write operation of the possibly freed cache page
res = spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
cp = spiffs_cache_page_allocate(fs);
if (cp) {
cp->flags = SPIFFS_CACHE_FLAG_WRTHRU;
cp->pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
s32_t res2 = SPIFFS_HAL_READ(fs,
addr - SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr),
SPIFFS_CFG_LOG_PAGE_SZ(fs),
spiffs_get_cache_page(fs, cache, cp->ix));
if (res2 != SPIFFS_OK) {
// honor read failure before possible write failure (bad idea?)
res = res2;
}
u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
} else {
// this will never happen, last resort for sake of symmetry
s32_t res2 = SPIFFS_HAL_READ(fs, addr, len, dst);
if (res2 != SPIFFS_OK) {
// honor read failure before possible write failure (bad idea?)
res = res2;
}
}
}
return res;
}
// reads from spi flash or the cache
s32_t ICACHE_FLASH_ATTR
spiffs_phys_rd(
spiffs *fs,
u8_t op,
spiffs_file fh,
u32_t addr,
u32_t len,
u8_t *dst) {
(void)fh;
s32_t res = SPIFFS_OK;
spiffs_cache *cache = spiffs_get_cache(fs);
spiffs_cache_page *cp = spiffs_cache_page_get(fs, SPIFFS_PADDR_TO_PAGE(fs, addr));
cache->last_access++;
if (cp) {
#if SPIFFS_CACHE_STATS
fs->cache_hits++;
#endif
cp->last_access = cache->last_access;
} else {
if ((op & SPIFFS_OP_TYPE_MASK) == SPIFFS_OP_T_OBJ_LU2) {
// for second layer lookup functions, we do not cache in order to prevent shredding
return fs->cfg.hal_read_f(
addr ,
len,
dst);
}
#if SPIFFS_CACHE_STATS
fs->cache_misses++;
#endif
res = spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
cp = spiffs_cache_page_allocate(fs);
if (cp) {
cp->flags = SPIFFS_CACHE_FLAG_WRTHRU;
cp->pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
}
s32_t res2 = fs->cfg.hal_read_f(
addr - SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr),
SPIFFS_CFG_LOG_PAGE_SZ(fs),
spiffs_get_cache_page(fs, cache, cp->ix));
if (res2 != SPIFFS_OK) {
res = res2;
}
}
u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
return res;
}
// writes to spi flash and/or the cache
s32_t ICACHE_FLASH_ATTR
spiffs_phys_wr(
spiffs *fs,
u8_t op,
spiffs_file fh,
u32_t addr,
u32_t len,
u8_t *src) {
(void)fh;
spiffs_page_ix pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
spiffs_cache *cache = spiffs_get_cache(fs);
spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
if (cp && (op & SPIFFS_OP_COM_MASK) != SPIFFS_OP_C_WRTHRU) {
// have a cache page
// copy in data to cache page
if ((op & SPIFFS_OP_COM_MASK) == SPIFFS_OP_C_DELE &&
(op & SPIFFS_OP_TYPE_MASK) != SPIFFS_OP_T_OBJ_LU) {
// page is being deleted, wipe from cache - unless it is a lookup page
spiffs_cache_page_free(fs, cp->ix, 0);
return fs->cfg.hal_write_f(addr, len, src);
}
u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
memcpy(&mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], src, len);
cache->last_access++;
cp->last_access = cache->last_access;
if (cp->flags && SPIFFS_CACHE_FLAG_WRTHRU) {
// page is being updated, no write-cache, just pass thru
return fs->cfg.hal_write_f(addr, len, src);
} else {
return SPIFFS_OK;
}
} else {
// no cache page, no write cache - just write thru
return fs->cfg.hal_write_f(addr, len, src);
}
}