blob: 681a5825d381f779f71fea3b7a78b80a05fc7b10 [file] [log] [blame]
/*
* Copyright (c) 2017-2020 Nordic Semiconductor ASA
* Copyright (c) 2015 Runtime Inc
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stddef.h>
#include <string.h>
#include <zephyr/fs/fcb.h>
#include "fcb_priv.h"
static struct flash_sector *
fcb_new_sector(struct fcb *fcb, int cnt)
{
struct flash_sector *prev;
struct flash_sector *cur;
int i;
prev = NULL;
i = 0;
cur = fcb->f_active.fe_sector;
do {
cur = fcb_getnext_sector(fcb, cur);
if (!prev) {
prev = cur;
}
if (cur == fcb->f_oldest) {
return NULL;
}
} while (i++ < cnt);
return prev;
}
/*
* Take one of the scratch blocks into use, if at all possible.
*/
int
fcb_append_to_scratch(struct fcb *fcb)
{
struct flash_sector *sector;
int rc;
sector = fcb_new_sector(fcb, 0);
if (!sector) {
return -ENOSPC;
}
rc = fcb_sector_hdr_init(fcb, sector, fcb->f_active_id + 1);
if (rc) {
return rc;
}
fcb->f_active.fe_sector = sector;
fcb->f_active.fe_elem_off = fcb_len_in_flash(fcb, sizeof(struct fcb_disk_area));
fcb->f_active_id++;
return 0;
}
int
fcb_append(struct fcb *fcb, uint16_t len, struct fcb_entry *append_loc)
{
struct flash_sector *sector;
struct fcb_entry *active;
int cnt;
int rc;
uint8_t tmp_str[MAX(8, fcb->f_align)];
/* Ensure defined value of padding bytes */
memset(tmp_str, fcb->f_erase_value, sizeof(tmp_str));
cnt = fcb_put_len(fcb, 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);
__ASSERT_NO_MSG(cnt <= sizeof(tmp_str));
rc = k_mutex_lock(&fcb->f_mtx, K_FOREVER);
if (rc) {
return -EINVAL;
}
active = &fcb->f_active;
if (active->fe_elem_off + len + cnt > active->fe_sector->fs_size) {
sector = fcb_new_sector(fcb, fcb->f_scratch_cnt);
if (!sector || (sector->fs_size <
fcb_len_in_flash(fcb, sizeof(struct fcb_disk_area)) + len + cnt)) {
rc = -ENOSPC;
goto err;
}
rc = fcb_sector_hdr_init(fcb, sector, fcb->f_active_id + 1);
if (rc) {
goto err;
}
fcb->f_active.fe_sector = sector;
fcb->f_active.fe_elem_off = fcb_len_in_flash(fcb, sizeof(struct fcb_disk_area));
fcb->f_active_id++;
}
rc = fcb_flash_write(fcb, active->fe_sector, active->fe_elem_off, tmp_str, cnt);
if (rc) {
rc = -EIO;
goto err;
}
append_loc->fe_sector = active->fe_sector;
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 0;
err:
k_mutex_unlock(&fcb->f_mtx);
return rc;
}
int
fcb_append_finish(struct fcb *fcb, struct fcb_entry *loc)
{
int rc;
uint8_t crc8[fcb->f_align];
off_t off;
(void)memset(crc8, 0xFF, sizeof(crc8));
rc = fcb_elem_crc8(fcb, loc, &crc8[0]);
if (rc) {
return rc;
}
off = loc->fe_data_off + fcb_len_in_flash(fcb, loc->fe_data_len);
rc = fcb_flash_write(fcb, loc->fe_sector, off, crc8, fcb->f_align);
if (rc) {
return -EIO;
}
return 0;
}