| /* |
| * Copyright (c) 2017 Nordic Semiconductor ASA |
| * Copyright (c) 2015 Runtime Inc |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <stddef.h> |
| |
| #include "fcb.h" |
| #include "fcb_priv.h" |
| |
| static struct flash_area * |
| fcb_new_area(struct fcb *fcb, int cnt) |
| { |
| struct flash_area *fa; |
| struct flash_area *rfa; |
| int i; |
| |
| rfa = NULL; |
| i = 0; |
| fa = fcb->f_active.fe_area; |
| do { |
| fa = fcb_getnext_area(fcb, fa); |
| if (!rfa) { |
| rfa = fa; |
| } |
| if (fa == fcb->f_oldest) { |
| return NULL; |
| } |
| } while (i++ < cnt); |
| return rfa; |
| } |
| |
| /* |
| * Take one of the scratch blocks into use, if at all possible. |
| */ |
| int |
| fcb_append_to_scratch(struct fcb *fcb) |
| { |
| struct flash_area *fa; |
| int rc; |
| |
| fa = fcb_new_area(fcb, 0); |
| if (!fa) { |
| return FCB_ERR_NOSPACE; |
| } |
| rc = fcb_sector_hdr_init(fcb, fa, fcb->f_active_id + 1); |
| if (rc) { |
| return rc; |
| } |
| fcb->f_active.fe_area = fa; |
| fcb->f_active.fe_elem_off = sizeof(struct fcb_disk_area); |
| fcb->f_active_id++; |
| return FCB_OK; |
| } |
| |
| int |
| fcb_append(struct fcb *fcb, u16_t len, struct fcb_entry *append_loc) |
| { |
| struct fcb_entry *active; |
| struct flash_area *fa; |
| u8_t tmp_str[2]; |
| int cnt; |
| int rc; |
| |
| cnt = fcb_put_len(tmp_str, len); |
| if (cnt < 0) { |
| return cnt; |
| } |
| cnt = fcb_len_in_flash(fcb, cnt); |
| len = fcb_len_in_flash(fcb, len) + fcb_len_in_flash(fcb, FCB_CRC_SZ); |
| |
| rc = k_mutex_lock(&fcb->f_mtx, K_FOREVER); |
| if (rc) { |
| return FCB_ERR_ARGS; |
| } |
| active = &fcb->f_active; |
| if (active->fe_elem_off + len + cnt > active->fe_area->fa_size) { |
| fa = fcb_new_area(fcb, fcb->f_scratch_cnt); |
| if (!fa || (fa->fa_size < |
| sizeof(struct fcb_disk_area) + len + cnt)) { |
| rc = FCB_ERR_NOSPACE; |
| goto err; |
| } |
| rc = fcb_sector_hdr_init(fcb, fa, fcb->f_active_id + 1); |
| if (rc) { |
| goto err; |
| } |
| fcb->f_active.fe_area = fa; |
| fcb->f_active.fe_elem_off = sizeof(struct fcb_disk_area); |
| fcb->f_active_id++; |
| } |
| |
| rc = flash_area_write(active->fe_area, active->fe_elem_off, tmp_str, |
| cnt); |
| if (rc) { |
| rc = FCB_ERR_FLASH; |
| goto err; |
| } |
| append_loc->fe_area = active->fe_area; |
| append_loc->fe_elem_off = active->fe_elem_off; |
| append_loc->fe_data_off = active->fe_elem_off + cnt; |
| |
| active->fe_elem_off = append_loc->fe_data_off + len; |
| |
| k_mutex_unlock(&fcb->f_mtx); |
| |
| return FCB_OK; |
| err: |
| k_mutex_unlock(&fcb->f_mtx); |
| return rc; |
| } |
| |
| int |
| fcb_append_finish(struct fcb *fcb, struct fcb_entry *loc) |
| { |
| int rc; |
| u8_t crc8; |
| off_t off; |
| |
| rc = fcb_elem_crc8(fcb, loc, &crc8); |
| if (rc) { |
| return rc; |
| } |
| off = loc->fe_data_off + fcb_len_in_flash(fcb, loc->fe_data_len); |
| |
| rc = flash_area_write(loc->fe_area, off, &crc8, sizeof(crc8)); |
| if (rc) { |
| return FCB_ERR_FLASH; |
| } |
| return 0; |
| } |