4 * Created on: Jun 23, 2013
9 #include "spiffs_nucleus.h"
13 // returns cached page for give page index, or null if no such cached page
14 static spiffs_cache_page *spiffs_cache_page_get(spiffs *fs, spiffs_page_ix pix) {
15 spiffs_cache *cache = spiffs_get_cache(fs);
16 if ((cache->cpage_use_map & cache->cpage_use_mask) == 0) return 0;
18 for (i = 0; i < cache->cpage_count; i++) {
19 spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
20 if ((cache->cpage_use_map & (1<<i)) &&
21 (cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) == 0 &&
23 SPIFFS_CACHE_DBG("CACHE_GET: have cache page "_SPIPRIi" for "_SPIPRIpg"\n", i, pix);
24 cp->last_access = cache->last_access;
28 //SPIFFS_CACHE_DBG("CACHE_GET: no cache for "_SPIPRIpg"\n", pix);
33 static s32_t spiffs_cache_page_free(spiffs *fs, int ix, u8_t write_back) {
34 s32_t res = SPIFFS_OK;
35 spiffs_cache *cache = spiffs_get_cache(fs);
36 spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, ix);
37 if (cache->cpage_use_map & (1<<ix)) {
39 (cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) == 0 &&
40 (cp->flags & SPIFFS_CACHE_FLAG_DIRTY)) {
41 u8_t *mem = spiffs_get_cache_page(fs, cache, ix);
42 res = SPIFFS_HAL_WRITE(fs, SPIFFS_PAGE_TO_PADDR(fs, cp->pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), mem);
46 cache->cpage_use_map &= ~(1 << ix);
48 if (cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) {
49 SPIFFS_CACHE_DBG("CACHE_FREE: free cache page "_SPIPRIi" objid "_SPIPRIid"\n", ix, cp->obj_id);
51 SPIFFS_CACHE_DBG("CACHE_FREE: free cache page "_SPIPRIi" pix "_SPIPRIpg"\n", ix, cp->pix);
58 // removes the oldest accessed cached page
59 static s32_t spiffs_cache_page_remove_oldest(spiffs *fs, u8_t flag_mask, u8_t flags) {
60 s32_t res = SPIFFS_OK;
61 spiffs_cache *cache = spiffs_get_cache(fs);
63 if ((cache->cpage_use_map & cache->cpage_use_mask) != cache->cpage_use_mask) {
64 // at least one free cpage
68 // all busy, scan thru all to find the cpage which has oldest access
72 for (i = 0; i < cache->cpage_count; i++) {
73 spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
74 if ((cache->last_access - cp->last_access) > oldest_val &&
75 (cp->flags & flag_mask) == flags) {
76 oldest_val = cache->last_access - cp->last_access;
82 res = spiffs_cache_page_free(fs, cand_ix, 1);
88 // allocates a new cached page and returns it, or null if all cache pages are busy
89 static spiffs_cache_page *spiffs_cache_page_allocate(spiffs *fs) {
90 spiffs_cache *cache = spiffs_get_cache(fs);
91 if (cache->cpage_use_map == 0xffffffff) {
92 // out of cache memory
96 for (i = 0; i < cache->cpage_count; i++) {
97 if ((cache->cpage_use_map & (1<<i)) == 0) {
98 spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
99 cache->cpage_use_map |= (1<<i);
100 cp->last_access = cache->last_access;
101 SPIFFS_CACHE_DBG("CACHE_ALLO: allocated cache page "_SPIPRIi"\n", i);
105 // out of cache entries
109 // drops the cache page for give page index
110 void spiffs_cache_drop_page(spiffs *fs, spiffs_page_ix pix) {
111 spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
113 spiffs_cache_page_free(fs, cp->ix, 0);
117 // ------------------------------
119 // reads from spi flash or the cache
120 s32_t spiffs_phys_rd(
128 s32_t res = SPIFFS_OK;
129 spiffs_cache *cache = spiffs_get_cache(fs);
130 spiffs_cache_page *cp = spiffs_cache_page_get(fs, SPIFFS_PADDR_TO_PAGE(fs, addr));
131 cache->last_access++;
133 // we've already got one, you see
134 #if SPIFFS_CACHE_STATS
137 cp->last_access = cache->last_access;
138 u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
139 memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
141 if ((op & SPIFFS_OP_TYPE_MASK) == SPIFFS_OP_T_OBJ_LU2) {
142 // for second layer lookup functions, we do not cache in order to prevent shredding
143 return SPIFFS_HAL_READ(fs, addr, len, dst);
145 #if SPIFFS_CACHE_STATS
148 // this operation will always free one cache page (unless all already free),
149 // the result code stems from the write operation of the possibly freed cache page
150 res = spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
152 cp = spiffs_cache_page_allocate(fs);
154 cp->flags = SPIFFS_CACHE_FLAG_WRTHRU;
155 cp->pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
157 s32_t res2 = SPIFFS_HAL_READ(fs,
158 addr - SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr),
159 SPIFFS_CFG_LOG_PAGE_SZ(fs),
160 spiffs_get_cache_page(fs, cache, cp->ix));
161 if (res2 != SPIFFS_OK) {
162 // honor read failure before possible write failure (bad idea?)
165 u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
166 memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
168 // this will never happen, last resort for sake of symmetry
169 s32_t res2 = SPIFFS_HAL_READ(fs, addr, len, dst);
170 if (res2 != SPIFFS_OK) {
171 // honor read failure before possible write failure (bad idea?)
179 // writes to spi flash and/or the cache
180 s32_t spiffs_phys_wr(
188 spiffs_page_ix pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
189 spiffs_cache *cache = spiffs_get_cache(fs);
190 spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
192 if (cp && (op & SPIFFS_OP_COM_MASK) != SPIFFS_OP_C_WRTHRU) {
194 // copy in data to cache page
196 if ((op & SPIFFS_OP_COM_MASK) == SPIFFS_OP_C_DELE &&
197 (op & SPIFFS_OP_TYPE_MASK) != SPIFFS_OP_T_OBJ_LU) {
198 // page is being deleted, wipe from cache - unless it is a lookup page
199 spiffs_cache_page_free(fs, cp->ix, 0);
200 return SPIFFS_HAL_WRITE(fs, addr, len, src);
203 u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
204 memcpy(&mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], src, len);
206 cache->last_access++;
207 cp->last_access = cache->last_access;
209 if (cp->flags & SPIFFS_CACHE_FLAG_WRTHRU) {
210 // page is being updated, no write-cache, just pass thru
211 return SPIFFS_HAL_WRITE(fs, addr, len, src);
216 // no cache page, no write cache - just write thru
217 return SPIFFS_HAL_WRITE(fs, addr, len, src);
222 // returns the cache page that this fd refers, or null if no cache page
223 spiffs_cache_page *spiffs_cache_page_get_by_fd(spiffs *fs, spiffs_fd *fd) {
224 spiffs_cache *cache = spiffs_get_cache(fs);
226 if ((cache->cpage_use_map & cache->cpage_use_mask) == 0) {
227 // all cpages free, no cpage cannot be assigned to obj_id
232 for (i = 0; i < cache->cpage_count; i++) {
233 spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
234 if ((cache->cpage_use_map & (1<<i)) &&
235 (cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) &&
236 cp->obj_id == fd->obj_id) {
244 // allocates a new cache page and refers this to given fd - flushes an old cache
245 // page if all cache is busy
246 spiffs_cache_page *spiffs_cache_page_allocate_by_fd(spiffs *fs, spiffs_fd *fd) {
247 // before this function is called, it is ensured that there is no already existing
248 // cache page with same object id
249 spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
250 spiffs_cache_page *cp = spiffs_cache_page_allocate(fs);
252 // could not get cache page
256 cp->flags = SPIFFS_CACHE_FLAG_TYPE_WR;
257 cp->obj_id = fd->obj_id;
262 // unrefers all fds that this cache page refers to and releases the cache page
263 void spiffs_cache_fd_release(spiffs *fs, spiffs_cache_page *cp) {
266 spiffs_fd *fds = (spiffs_fd *)fs->fd_space;
267 for (i = 0; i < fs->fd_count; i++) {
268 spiffs_fd *cur_fd = &fds[i];
269 if (cur_fd->file_nbr != 0 && cur_fd->cache_page == cp) {
270 cur_fd->cache_page = 0;
273 spiffs_cache_page_free(fs, cp->ix, 0);
280 // initializes the cache
281 void spiffs_cache_init(spiffs *fs) {
282 if (fs->cache == 0) return;
283 u32_t sz = fs->cache_size;
284 u32_t cache_mask = 0;
287 (sz - sizeof(spiffs_cache)) / (SPIFFS_CACHE_PAGE_SIZE(fs));
288 if (cache_entries <= 0) return;
290 for (i = 0; i < cache_entries; i++) {
296 memset(&cache, 0, sizeof(spiffs_cache));
297 cache.cpage_count = cache_entries;
298 cache.cpages = (u8_t *)((u8_t *)fs->cache + sizeof(spiffs_cache));
300 cache.cpage_use_map = 0xffffffff;
301 cache.cpage_use_mask = cache_mask;
302 memcpy(fs->cache, &cache, sizeof(spiffs_cache));
304 spiffs_cache *c = spiffs_get_cache(fs);
306 memset(c->cpages, 0, c->cpage_count * SPIFFS_CACHE_PAGE_SIZE(fs));
308 c->cpage_use_map &= ~(c->cpage_use_mask);
309 for (i = 0; i < cache.cpage_count; i++) {
310 spiffs_get_cache_page_hdr(fs, c, i)->ix = i;
314 #endif // SPIFFS_CACHE