mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-11 11:22:57 +00:00
e3cd915d8f
Prior to this commit: `struct fcb` contained a pointer to an array of `struct flash_area`. Each entry in the array represented a flash sector that the fcb comprised. After commit: `struct fcb` contains a pointer to an array of `struct flash_sector`, not `struct flash_area`. Rationale: The FCB needs to know which sectors it occupies for its rotate operation. However, the `flash_area` type is meant to represent a collection of sectors, not a single sector. `struct flash_area` contains information that the fcb does not need (e.g., area ID and device ID). Furthermore, the flash_map API provides a means of converting a flash area ID to an array of sectors (`flash_area_get_sectors()`), but no way to convert to an array of areas. Signed-off-by: Christopher Collins <ccollins@apache.org>
122 lines
2.2 KiB
C
122 lines
2.2 KiB
C
/*
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* Copyright (c) 2017 Nordic Semiconductor ASA
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* Copyright (c) 2015 Runtime Inc
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stddef.h>
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#include "fcb.h"
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#include "fcb_priv.h"
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int
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fcb_getnext_in_sector(struct fcb *fcb, struct fcb_entry *loc)
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{
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int rc;
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rc = fcb_elem_info(fcb, loc);
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if (rc == 0 || rc == FCB_ERR_CRC) {
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do {
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loc->fe_elem_off = loc->fe_data_off +
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fcb_len_in_flash(fcb, loc->fe_data_len) +
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fcb_len_in_flash(fcb, FCB_CRC_SZ);
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rc = fcb_elem_info(fcb, loc);
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if (rc != FCB_ERR_CRC) {
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break;
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}
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} while (rc == FCB_ERR_CRC);
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}
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return rc;
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}
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struct flash_sector *
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fcb_getnext_sector(struct fcb *fcb, struct flash_sector *sector)
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{
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sector++;
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if (sector >= &fcb->f_sectors[fcb->f_sector_cnt]) {
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sector = &fcb->f_sectors[0];
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}
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return sector;
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}
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int
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fcb_getnext_nolock(struct fcb *fcb, struct fcb_entry *loc)
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{
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int rc;
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if (loc->fe_sector == NULL) {
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/*
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* Find the first one we have in flash.
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*/
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loc->fe_sector = fcb->f_oldest;
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}
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if (loc->fe_elem_off == 0) {
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/*
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* If offset is zero, we serve the first entry from the sector.
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*/
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loc->fe_elem_off = sizeof(struct fcb_disk_area);
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rc = fcb_elem_info(fcb, loc);
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switch (rc) {
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case 0:
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return 0;
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case FCB_ERR_CRC:
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break;
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default:
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goto next_sector;
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}
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} else {
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rc = fcb_getnext_in_sector(fcb, loc);
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if (rc == 0) {
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return 0;
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}
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if (rc == FCB_ERR_NOVAR) {
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goto next_sector;
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}
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}
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while (rc == FCB_ERR_CRC) {
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rc = fcb_getnext_in_sector(fcb, loc);
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if (rc == 0) {
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return 0;
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}
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if (rc != FCB_ERR_CRC) {
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/*
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* Moving to next sector.
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*/
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next_sector:
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if (loc->fe_sector == fcb->f_active.fe_sector) {
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return FCB_ERR_NOVAR;
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}
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loc->fe_sector = fcb_getnext_sector(fcb, loc->fe_sector);
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loc->fe_elem_off = sizeof(struct fcb_disk_area);
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rc = fcb_elem_info(fcb, loc);
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switch (rc) {
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case 0:
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return 0;
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case FCB_ERR_CRC:
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break;
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default:
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goto next_sector;
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}
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}
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}
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return 0;
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}
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int
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fcb_getnext(struct fcb *fcb, struct fcb_entry *loc)
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{
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int rc;
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rc = k_mutex_lock(&fcb->f_mtx, K_FOREVER);
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if (rc) {
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return FCB_ERR_ARGS;
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}
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rc = fcb_getnext_nolock(fcb, loc);
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k_mutex_unlock(&fcb->f_mtx);
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return rc;
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}
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