// frees cached page
static s32_t ICACHE_FLASH_ATTR
spiffs_cache_page_free(spiffs *fs, int ix, u8_t write_back) {
s32_t res = SPIFFS_OK;
spiffs_cache *cache = spiffs_get_cache(fs);
spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, ix);
if (cache->cpage_use_map & (1<<ix)) {
if (write_back &&
(cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) == 0 &&
(cp->flags & SPIFFS_CACHE_FLAG_DIRTY)) {
u8_t *mem = spiffs_get_cache_page(fs, cache, ix);
res = fs->cfg.hal_write_f(SPIFFS_PAGE_TO_PADDR(fs, cp->pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), mem);
}
cp->flags = 0;
cache->cpage_use_map &= ~(1 << ix);
if (cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) {
SPIFFS_CACHE_DBG("CACHE_FREE: free cache page %d objid %04x\n", ix, cp->obj_id);
} else {
SPIFFS_CACHE_DBG("CACHE_FREE: free cache page %d pix %04x\n", ix, cp->pix);
}
}
return res;
}
// Checks if there are any cached writes for the object id associated with
// given filehandle. If so, these writes are flushed.
static s32_t spiffs_fflush_cache(spiffs *fs, spiffs_file fh) {
s32_t res = SPIFFS_OK;
#if SPIFFS_CACHE_WR
spiffs_fd *fd;
res = spiffs_fd_get(fs, fh, &fd);
SPIFFS_API_CHECK_RES(fs, res);
if ((fd->flags & SPIFFS_DIRECT) == 0) {
if (fd->cache_page == 0) {
// see if object id is associated with cache already
fd->cache_page = spiffs_cache_page_get_by_fd(fs, fd);
}
if (fd->cache_page) {
SPIFFS_CACHE_DBG("CACHE_WR_DUMP: dumping cache page %d for fd %d:%04x, flush, offs:%d size:%d\n",
fd->cache_page->ix, fd->file_nbr, fd->obj_id, fd->cache_page->offset, fd->cache_page->size);
res = spiffs_hydro_write(fs, fd,
spiffs_get_cache_page(fs, spiffs_get_cache(fs), fd->cache_page->ix),
fd->cache_page->offset, fd->cache_page->size);
if (res < SPIFFS_OK) {
fs->errno = res;
}
spiffs_cache_fd_release(fs, fd->cache_page);
}
}
#endif
return res;
}
// returns cached page for give page index, or null if no such cached page
static spiffs_cache_page *ICACHE_FLASH_ATTR spiffs_cache_page_get(spiffs *fs, spiffs_page_ix pix) {
spiffs_cache *cache = spiffs_get_cache(fs);
if ((cache->cpage_use_map & cache->cpage_use_mask) == 0) return 0;
int i;
for (i = 0; i < cache->cpage_count; i++) {
spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
if ((cache->cpage_use_map & (1<<i)) &&
(cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) == 0 &&
cp->pix == pix ) {
SPIFFS_CACHE_DBG("CACHE_GET: have cache page %i for %04x\n", i, pix);
cp->last_access = cache->last_access;
return cp;
}
}
//SPIFFS_CACHE_DBG("CACHE_GET: no cache for %04x\n", pix);
return 0;
}
// allocates a new cached page and returns it, or null if all cache pages are busy
static spiffs_cache_page *ICACHE_FLASH_ATTR spiffs_cache_page_allocate(spiffs *fs) {
spiffs_cache *cache = spiffs_get_cache(fs);
if (cache->cpage_use_map == 0xffffffff) {
// out of cache memory
return 0;
}
int i;
for (i = 0; i < cache->cpage_count; i++) {
if ((cache->cpage_use_map & (1<<i)) == 0) {
spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
cache->cpage_use_map |= (1<<i);
cp->last_access = cache->last_access;
SPIFFS_CACHE_DBG("CACHE_ALLO: allocated cache page %i\n", i);
return cp;
}
}
// out of cache entries
return 0;
}
s32_t SPIFFS_write(spiffs *fs, spiffs_file fh, void *buf, u32_t len) {
SPIFFS_API_CHECK_MOUNT(fs);
SPIFFS_LOCK(fs);
spiffs_fd *fd;
s32_t res;
u32_t offset;
res = spiffs_fd_get(fs, fh, &fd);
SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
if ((fd->flags & SPIFFS_WRONLY) == 0) {
res = SPIFFS_ERR_NOT_WRITABLE;
SPIFFS_API_CHECK_RES_UNLOCK(fs, res);
}
offset = fd->fdoffset;
#if SPIFFS_CACHE_WR
if (fd->cache_page == 0) {
// see if object id is associated with cache already
fd->cache_page = spiffs_cache_page_get_by_fd(fs, fd);
}
#endif
if (fd->flags & SPIFFS_APPEND) {
if (fd->size == SPIFFS_UNDEFINED_LEN) {
offset = 0;
} else {
offset = fd->size;
}
#if SPIFFS_CACHE_WR
if (fd->cache_page) {
offset = MAX(offset, fd->cache_page->offset + fd->cache_page->size);
}
#endif
}
SPIFFS_DBG("SPIFFS_write %d %04x offs:%d len %d\n", fh, fd->obj_id, offset, len);
#if SPIFFS_CACHE_WR
if ((fd->flags & SPIFFS_DIRECT) == 0) {
if (len < (s32_t)SPIFFS_CFG_LOG_PAGE_SZ(fs)) {
// small write, try to cache it
u8_t alloc_cpage = 1;
if (fd->cache_page) {
// have a cached page for this fd already, check cache page boundaries
if (offset < fd->cache_page->offset || // writing before cache
offset > fd->cache_page->offset + fd->cache_page->size || // writing after cache
offset + len > fd->cache_page->offset + SPIFFS_CFG_LOG_PAGE_SZ(fs)) // writing beyond cache page
{
// boundary violation, write back cache first and allocate new
SPIFFS_CACHE_DBG("CACHE_WR_DUMP: dumping cache page %d for fd %d:&04x, boundary viol, offs:%d size:%d\n",
fd->cache_page->ix, fd->file_nbr, fd->obj_id, fd->cache_page->offset, fd->cache_page->size);
res = spiffs_hydro_write(fs, fd,
spiffs_get_cache_page(fs, spiffs_get_cache(fs), fd->cache_page->ix),
fd->cache_page->offset, fd->cache_page->size);
spiffs_cache_fd_release(fs, fd->cache_page);
} else {
// writing within cache
alloc_cpage = 0;
}
}
if (alloc_cpage) {
fd->cache_page = spiffs_cache_page_allocate_by_fd(fs, fd);
if (fd->cache_page) {
fd->cache_page->offset = offset;
fd->cache_page->size = 0;
SPIFFS_CACHE_DBG("CACHE_WR_ALLO: allocating cache page %d for fd %d:%04x\n",
fd->cache_page->ix, fd->file_nbr, fd->obj_id);
}
}
if (fd->cache_page) {
u32_t offset_in_cpage = offset - fd->cache_page->offset;
SPIFFS_CACHE_DBG("CACHE_WR_WRITE: storing to cache page %d for fd %d:%04x, offs %d:%d len %d\n",
fd->cache_page->ix, fd->file_nbr, fd->obj_id,
offset, offset_in_cpage, len);
spiffs_cache *cache = spiffs_get_cache(fs);
u8_t *cpage_data = spiffs_get_cache_page(fs, cache, fd->cache_page->ix);
c_memcpy(&cpage_data[offset_in_cpage], buf, len);
fd->cache_page->size = MAX(fd->cache_page->size, offset_in_cpage + len);
fd->fdoffset += len;
SPIFFS_UNLOCK(fs);
return len;
} else {
res = spiffs_hydro_write(fs, fd, buf, offset, len);
SPIFFS_API_CHECK_RES(fs, res);
fd->fdoffset += len;
SPIFFS_UNLOCK(fs);
return res;
}
} else {
// big write, no need to cache it - but first check if there is a cached write already
if (fd->cache_page) {
// write back cache first
SPIFFS_CACHE_DBG("CACHE_WR_DUMP: dumping cache page %d for fd %d:%04x, big write, offs:%d size:%d\n",
fd->cache_page->ix, fd->file_nbr, fd->obj_id, fd->cache_page->offset, fd->cache_page->size);
res = spiffs_hydro_write(fs, fd,
spiffs_get_cache_page(fs, spiffs_get_cache(fs), fd->cache_page->ix),
fd->cache_page->offset, fd->cache_page->size);
spiffs_cache_fd_release(fs, fd->cache_page);
res = spiffs_hydro_write(fs, fd, buf, offset, len);
SPIFFS_API_CHECK_RES(fs, res);
}
}
}
#endif
res = spiffs_hydro_write(fs, fd, buf, offset, len);
SPIFFS_API_CHECK_RES(fs, res);
fd->fdoffset += len;
SPIFFS_UNLOCK(fs);
return res;
}