// removes the oldest accessed cached page
static s32_t ICACHE_FLASH_ATTR
spiffs_cache_page_remove_oldest(spiffs *fs, u8_t flag_mask, u8_t flags) {
s32_t res = SPIFFS_OK;
spiffs_cache *cache = spiffs_get_cache(fs);
if ((cache->cpage_use_map & cache->cpage_use_mask) != cache->cpage_use_mask) {
// at least one free cpage
return SPIFFS_OK;
}
// all busy, scan thru all to find the cpage which has oldest access
int i;
int cand_ix = -1;
u32_t oldest_val = 0;
for (i = 0; i < cache->cpage_count; i++) {
spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
if ((cache->last_access - cp->last_access) > oldest_val &&
(cp->flags & flag_mask) == flags) {
oldest_val = cache->last_access - cp->last_access;
cand_ix = i;
}
}
if (cand_ix >= 0) {
res = spiffs_cache_page_free(fs, cand_ix, 1);
}
return res;
}
// drops the cache page for give page index
void ICACHE_FLASH_ATTR
spiffs_cache_drop_page(spiffs *fs, spiffs_page_ix pix) {
spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
if (cp) {
spiffs_cache_page_free(fs, cp->ix, 0);
}
}
// unrefers all fds that this cache page refers to and releases the cache page
void ICACHE_FLASH_ATTR spiffs_cache_fd_release(spiffs *fs, spiffs_cache_page *cp) {
if (cp == 0) return;
int i;
spiffs_fd *fds = (spiffs_fd *)fs->fd_space;
for (i = 0; i < fs->fd_count; i++) {
spiffs_fd *cur_fd = &fds[i];
if (cur_fd->file_nbr != 0 && cur_fd->cache_page == cp) {
cur_fd->cache_page = 0;
}
}
spiffs_cache_page_free(fs, cp->ix, 0);
cp->obj_id = 0;
}
// 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);
}
}
// drops the cache page for give page index
void spiffs_cache_drop_page(spiffs *fs, spiffs_page_ix pix) {
spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
if (cp) {
spiffs_cache_page_free(fs, cp->ix, 0);
}
}
