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205c8934a3
nuttx/drivers/mtd/mtd_config_fs.c
wangbowen6 344c8be049 poll: add poll_notify() api and call it in all drivers 
Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
2022-09-26 12:06:32 +08:00

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/****************************************************************************
* drivers/mtd/mtd_config_fs.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* NVS: non volatile storage in flash
*
* Copyright (c) 2018 Laczen
*
* SPDX-License-Identifier: Apache-2.0
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <debug.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/poll.h>
#include <nuttx/crc8.h>
#include <nuttx/kmalloc.h>
#include <nuttx/mtd/mtd.h>
#include <nuttx/mtd/configdata.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define MIN(a, b) ((a) > (b) ? (b) : (a))
/* MASKS AND SHIFT FOR ADDRESSES
* an address in nvs is an uint32_t where:
* high 2 bytes represent the block number
* low 2 bytes represent the offset in a block
*/
#define ADDR_BLOCK_MASK 0xFFFF0000
#define ADDR_BLOCK_SHIFT 16
#define ADDR_OFFS_MASK 0x0000FFFF
/* We don't want to store all the read content in stack or heap,
* so we make a buffer to do compare or move.
*/
#define NVS_BUFFER_SIZE 32
/* If data is written after last ate, and power loss happens,
* we need to find a clean offset by skipping dirty data.
* This macro defines how many bytes to skip when dirty data
* is spotted(may take several skips).
* Normally 1 byte is okay, such process only happens when
* nvs is started, and it is acceptable to take some time during
* starting.
*/
#define NVS_CORRUPT_DATA_SKIP_STEP 1
/* Gc done or close ate has the id of 0xffffffff.
* We can tell if the ate is special by looking at its id.
*/
#define NVS_SPECIAL_ATE_ID 0xffffffff
/****************************************************************************
* Private Types
****************************************************************************/
/* Non-volatile Storage File system structure */
struct nvs_fs
{
FAR struct mtd_dev_s *mtd; /* MTD device */
struct mtd_geometry_s geo;
uint8_t erasestate; /* Erased value */
uint32_t ate_wra; /* Next alloc table entry
* Write address
*/
uint32_t data_wra; /* Next data write address */
uint32_t step_addr; /* For traverse */
mutex_t nvs_lock;
};
/* Allocation Table Entry */
begin_packed_struct struct nvs_ate
{
uint32_t id; /* Data id */
uint16_t offset; /* Data offset within block */
uint16_t len; /* Data len within block */
uint16_t key_len; /* Key string len */
uint8_t part; /* Part of a multipart data - future extension */
uint8_t crc8; /* Crc8 check of the ate entry */
uint8_t expired; /* 0xFF-newest entry, others-old entry */
uint8_t reserved[3]; /* For future extension */
} end_packed_struct;
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* MTD NVS opeation api */
static int mtdconfig_open(FAR struct file *filep);
static int mtdconfig_close(FAR struct file *filep);
static ssize_t mtdconfig_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static int mtdconfig_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
static int mtdconfig_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_mtdnvs_fops =
{
mtdconfig_open, /* Open */
mtdconfig_close, /* Close */
mtdconfig_read, /* Read */
NULL, /* Write */
NULL, /* Seek */
mtdconfig_ioctl, /* Ioctl */
mtdconfig_poll /* Poll */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* Unlink */
#endif
};
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nvs_fnv_hash
****************************************************************************/
static uint32_t nvs_fnv_hash(FAR const uint8_t *input, uint32_t len)
{
uint32_t i = 0;
uint32_t hval = 2166136261;
/* FNV-1 hash each octet in the buffer */
while (i++ < len)
{
/* Multiply by the 32 bit FNV magic prime mod 2^32 */
hval *= 0x01000193;
/* Xor the bottom with the current octet */
hval ^= *input++;
}
return hval;
}
/****************************************************************************
* Name: nvs_flash_wrt
*
* Description:
* Flash routines, process offset then write.
*
****************************************************************************/
static int nvs_flash_wrt(FAR struct nvs_fs *fs, uint32_t addr,
FAR const void *data, size_t len)
{
off_t offset;
int ret;
offset = fs->geo.erasesize * (addr >> ADDR_BLOCK_SHIFT);
offset += addr & ADDR_OFFS_MASK;
ret = MTD_WRITE(fs->mtd, offset, len, data);
if (ret < 0)
{
return ret;
}
return OK;
}
/****************************************************************************
* Name: nvs_flash_rd
*
* Description:
* Basic flash read from nvs address.
*
****************************************************************************/
static int nvs_flash_rd(FAR struct nvs_fs *fs, uint32_t addr,
FAR void *data, size_t len)
{
off_t offset;
int ret;
offset = fs->geo.erasesize * (addr >> ADDR_BLOCK_SHIFT);
offset += addr & ADDR_OFFS_MASK;
ret = MTD_READ(fs->mtd, offset, len, data);
if (ret < 0)
{
return ret;
}
return OK;
}
/****************************************************************************
* Name: nvs_flash_ate_wrt
*
* Description:
* Allocation entry write.
*
****************************************************************************/
static int nvs_flash_ate_wrt(FAR struct nvs_fs *fs,
FAR const struct nvs_ate *entry)
{
int rc;
rc = nvs_flash_wrt(fs, fs->ate_wra, entry, sizeof(struct nvs_ate));
fs->ate_wra -= sizeof(struct nvs_ate);
return rc;
}
/****************************************************************************
* Name: nvs_flash_data_wrt
****************************************************************************/
static int nvs_flash_data_wrt(FAR struct nvs_fs *fs,
FAR const void *data, size_t len)
{
int rc;
rc = nvs_flash_wrt(fs, fs->data_wra, data, len);
fs->data_wra += len;
finfo("write data done, data_wra=0x%" PRIx32 "\n",
fs->data_wra);
return rc;
}
/****************************************************************************
* Name: nvs_flash_ate_rd
****************************************************************************/
static int nvs_flash_ate_rd(FAR struct nvs_fs *fs, uint32_t addr,
FAR struct nvs_ate *entry)
{
return nvs_flash_rd(fs, addr, entry, sizeof(struct nvs_ate));
}
/****************************************************************************
* Name: nvs_flash_block_cmp
*
* Description:
* Compares the data in flash at addr to data
* in blocks of size NVS_BLOCK_SIZE aligned to fs->write_block_size.
* Returns 0 if equal, 1 if not equal, errcode if error.
*
****************************************************************************/
static int nvs_flash_block_cmp(FAR struct nvs_fs *fs, uint32_t addr,
FAR const void *data, size_t len)
{
FAR const uint8_t *data8 = (FAR const uint8_t *)data;
int rc;
size_t bytes_to_cmp;
uint8_t buf[NVS_BUFFER_SIZE];
while (len > 0)
{
bytes_to_cmp = MIN(NVS_BUFFER_SIZE, len);
rc = nvs_flash_rd(fs, addr, buf, bytes_to_cmp);
if (rc)
{
return rc;
}
rc = memcmp(data8, buf, bytes_to_cmp);
if (rc)
{
return 1;
}
len -= bytes_to_cmp;
addr += bytes_to_cmp;
data8 += bytes_to_cmp;
}
return 0;
}
/****************************************************************************
* Name: nvs_flash_direct_cmp
*
* Description:
* Compares the data in flash at addr1 and addr2
* of len in blocks of size NVS_BLOCK_SIZE aligned to fs->write_block_size.
* Returns 0 if equal, 1 if not equal, errcode if error.
*
****************************************************************************/
static int nvs_flash_direct_cmp(FAR struct nvs_fs *fs, uint32_t addr1,
uint32_t addr2, size_t len)
{
int rc;
size_t bytes_to_cmp;
uint8_t buf1[NVS_BUFFER_SIZE];
uint8_t buf2[NVS_BUFFER_SIZE];
while (len > 0)
{
bytes_to_cmp = MIN(NVS_BUFFER_SIZE, len);
rc = nvs_flash_rd(fs, addr1, buf1, bytes_to_cmp);
if (rc)
{
return rc;
}
rc = nvs_flash_rd(fs, addr2, buf2, bytes_to_cmp);
if (rc)
{
return rc;
}
rc = memcmp(buf1, buf2, bytes_to_cmp);
if (rc)
{
return 1;
}
len -= bytes_to_cmp;
addr1 += bytes_to_cmp;
addr2 += bytes_to_cmp;
}
return 0;
}
/****************************************************************************
* Name: nvs_flash_cmp_const
*
* Description:
* Compares the data in flash at addr to a constant
* value. returns 0 if all data in flash is equal to value, 1 if not equal,
* errcode if error.
*
****************************************************************************/
static int nvs_flash_cmp_const(FAR struct nvs_fs *fs, uint32_t addr,
uint8_t value, size_t len)
{
int rc;
size_t bytes_to_cmp;
uint8_t cmp[NVS_BUFFER_SIZE];
memset(cmp, value, NVS_BUFFER_SIZE);
while (len > 0)
{
bytes_to_cmp = MIN(NVS_BUFFER_SIZE, len);
rc = nvs_flash_block_cmp(fs, addr, cmp, bytes_to_cmp);
if (rc)
{
return rc;
}
len -= bytes_to_cmp;
addr += bytes_to_cmp;
}
return 0;
}
/****************************************************************************
* Name: nvs_flash_block_move
*
* Description:
* Move a block at addr to the current data write
* location and updates the data write location.
*
****************************************************************************/
static int nvs_flash_block_move(FAR struct nvs_fs *fs, uint32_t addr,
size_t len)
{
int rc;
size_t bytes_to_copy;
uint8_t buf[NVS_BUFFER_SIZE];
while (len)
{
bytes_to_copy = MIN(NVS_BUFFER_SIZE, len);
rc = nvs_flash_rd(fs, addr, buf, bytes_to_copy);
if (rc)
{
return rc;
}
rc = nvs_flash_data_wrt(fs, buf, bytes_to_copy);
if (rc)
{
return rc;
}
len -= bytes_to_copy;
addr += bytes_to_copy;
}
return 0;
}
/****************************************************************************
* Name: nvs_flash_erase_block
*
* Description:
* Erase a block by first checking it is used and then erasing if required.
* Return 0 if OK, errorcode on error.
*
****************************************************************************/
static int nvs_flash_erase_block(FAR struct nvs_fs *fs, uint32_t addr)
{
int rc;
finfo("Erasing addr %" PRIx32 "\n", addr);
rc = MTD_ERASE(fs->mtd, addr >> ADDR_BLOCK_SHIFT, 1);
if (rc < 0)
{
ferr("Erasing failed %d\n", rc);
return rc;
}
return 0;
}
/****************************************************************************
* Name: nvs_ate_crc8_update
*
* Description:
* Crc update on allocation entry.
*
****************************************************************************/
static void nvs_ate_crc8_update(FAR struct nvs_ate *entry)
{
uint8_t ate_crc;
ate_crc = crc8part((FAR const uint8_t *)entry,
offsetof(struct nvs_ate, crc8), 0xff);
entry->crc8 = ate_crc;
}
/****************************************************************************
* Name: nvs_ate_crc8_check
*
* Description:
* Crc check on allocation entry.
* Returns 0 if OK, 1 on crc fail.
*
****************************************************************************/
static int nvs_ate_crc8_check(FAR const struct nvs_ate *entry)
{
uint8_t ate_crc;
ate_crc = crc8part((FAR const uint8_t *)entry,
offsetof(struct nvs_ate, crc8), 0xff);
if (ate_crc == entry->crc8)
{
return 0;
}
return 1;
}
/****************************************************************************
* Name: nvs_ate_cmp_const
*
* Description:
* Compares an ATE to a constant value. returns 0 if
* the whole ATE is equal to value, 1 if not equal.
*
****************************************************************************/
static int nvs_ate_cmp_const(FAR const struct nvs_ate *entry,
uint8_t value)
{
FAR const uint8_t *data8 = (FAR const uint8_t *)entry;
int i;
for (i = 0; i < sizeof(struct nvs_ate); i++)
{
if (data8[i] != value)
{
return 1;
}
}
return 0;
}
/****************************************************************************
* Name: nvs_ate_valid
*
* Description:
* Return 1 if crc8 and offset valid, 0 otherwise
*
****************************************************************************/
static int nvs_ate_valid(FAR struct nvs_fs *fs,
FAR const struct nvs_ate *entry)
{
if (nvs_ate_crc8_check(entry) ||
entry->offset >= (fs->geo.erasesize - sizeof(struct nvs_ate)))
{
return 0;
}
return 1;
}
/****************************************************************************
* Name: nvs_close_ate_valid
*
* Description:
* Validates an block close ate:
* A valid block close ate:
* - Calid ate.
* - Len = 0 and id = 0xFFFFFFFF.
* - Offset points to location at ate multiple from block size.
* Return 1 if valid, 0 otherwise.
*
****************************************************************************/
static int nvs_close_ate_valid(FAR struct nvs_fs *fs,
FAR const struct nvs_ate *entry)
{
if (!nvs_ate_valid(fs, entry) || entry->len != 0 ||
entry->id != NVS_SPECIAL_ATE_ID)
{
return 0;
}
if ((fs->geo.erasesize - entry->offset) % sizeof(struct nvs_ate))
{
return 0;
}
return 1;
}
/****************************************************************************
* Name: nvs_flash_wrt_entry
*
* Description:
* Store an entry in flash
*
****************************************************************************/
static int nvs_flash_wrt_entry(FAR struct nvs_fs *fs, uint32_t id,
FAR const uint8_t *key, size_t key_size,
FAR const void *data, size_t len)
{
int rc;
struct nvs_ate entry;
memset(&entry, fs->erasestate, sizeof(entry));
entry.id = id;
entry.offset = fs->data_wra & ADDR_OFFS_MASK;
entry.len = len;
entry.key_len = key_size;
nvs_ate_crc8_update(&entry);
/* Let's sew key and data into one, key comes first, then data */
rc = nvs_flash_data_wrt(fs, key, key_size);
if (rc)
{
ferr("Write key failed, rc=%d\n", rc);
return rc;
}
rc = nvs_flash_data_wrt(fs, data, len);
if (rc)
{
ferr("Write value failed, rc=%d\n", rc);
return rc;
}
rc = nvs_flash_ate_wrt(fs, &entry);
if (rc)
{
ferr("Write ate failed, rc=%d\n", rc);
return rc;
}
return 0;
}
/****************************************************************************
* Name: nvs_recover_last_ate
*
* Description:
* If the closing ate is invalid, its offset cannot be trusted and
* the last valid ate of the block should instead try to be recovered
* by going through all ate's.
*
* Addr should point to the faulty closing ate and will be updated to
* the last valid ate. If no valid ate is found it will be left untouched.
*
****************************************************************************/
static int nvs_recover_last_ate(FAR struct nvs_fs *fs,
FAR uint32_t *addr)
{
uint32_t data_end_addr;
uint32_t ate_end_addr;
struct nvs_ate end_ate;
int rc;
finfo("Recovering last ate from block %" PRIu32 "\n",
(*addr >> ADDR_BLOCK_SHIFT));
*addr -= sizeof(struct nvs_ate);
ate_end_addr = *addr;
data_end_addr = *addr & ADDR_BLOCK_MASK;
while (ate_end_addr > data_end_addr)
{
rc = nvs_flash_ate_rd(fs, ate_end_addr, &end_ate);
if (rc)
{
return rc;
}
if (nvs_ate_valid(fs, &end_ate))
{
/* Found a valid ate, update data_end_addr and *addr */
data_end_addr &= ADDR_BLOCK_MASK;
data_end_addr += end_ate.offset + end_ate.key_len + end_ate.len;
*addr = ate_end_addr;
}
ate_end_addr -= sizeof(struct nvs_ate);
}
return 0;
}
/****************************************************************************
* Name: nvs_prev_ate
*
* Description:
* Walking through allocation entry list, from newest to oldest entries.
* Read ate from addr, modify addr to the previous ate.
*
****************************************************************************/
static int nvs_prev_ate(FAR struct nvs_fs *fs, FAR uint32_t *addr,
FAR struct nvs_ate *ate)
{
int rc;
struct nvs_ate close_ate;
rc = nvs_flash_ate_rd(fs, *addr, ate);
if (rc)
{
return rc;
}
*addr += sizeof(struct nvs_ate);
if (((*addr) & ADDR_OFFS_MASK) !=
(fs->geo.erasesize - sizeof(struct nvs_ate)))
{
return 0;
}
/* Last ate in block, do jump to previous block */
if (((*addr) >> ADDR_BLOCK_SHIFT) == 0)
{
*addr += ((fs->geo.neraseblocks - 1) << ADDR_BLOCK_SHIFT);
}
else
{
*addr -= (1 << ADDR_BLOCK_SHIFT);
}
rc = nvs_flash_ate_rd(fs, *addr, &close_ate);
if (rc)
{
return rc;
}
rc = nvs_ate_cmp_const(&close_ate, fs->erasestate);
/* At the end of filesystem */
if (!rc)
{
*addr = fs->ate_wra;
return 0;
}
/* Update the address if the close ate is valid. */
if (nvs_close_ate_valid(fs, &close_ate))
{
*addr &= ADDR_BLOCK_MASK;
*addr += close_ate.offset;
return 0;
}
/* The close_ate was invalid, `lets find out the last valid ate
* and point the address to this found ate.
*
* Remark: if there was absolutely no valid data in the block *addr
* is kept at block_end - 2*ate_size, the next read will contain
* invalid data and continue with a block jump
*/
return nvs_recover_last_ate(fs, addr);
}
/****************************************************************************
* Name: nvs_block_advance
****************************************************************************/
static void nvs_block_advance(FAR struct nvs_fs *fs, FAR uint32_t *addr)
{
*addr += (1 << ADDR_BLOCK_SHIFT);
if ((*addr >> ADDR_BLOCK_SHIFT) == fs->geo.neraseblocks)
{
*addr -= (fs->geo.neraseblocks << ADDR_BLOCK_SHIFT);
}
}
/****************************************************************************
* Name: nvs_block_close
*
* Description:
* Allocation entry close (this closes the current block) by writing
* offset of last ate to the block end.
*
****************************************************************************/
static int nvs_block_close(FAR struct nvs_fs *fs)
{
int rc;
struct nvs_ate close_ate;
memset(&close_ate, fs->erasestate, sizeof(close_ate));
close_ate.id = NVS_SPECIAL_ATE_ID;
close_ate.len = 0;
close_ate.key_len = 0;
close_ate.offset =
(fs->ate_wra + sizeof(struct nvs_ate)) & ADDR_OFFS_MASK;
fs->ate_wra &= ADDR_BLOCK_MASK;
fs->ate_wra += fs->geo.erasesize - sizeof(struct nvs_ate);
nvs_ate_crc8_update(&close_ate);
rc = nvs_flash_ate_wrt(fs, &close_ate);
if (rc < 0)
{
ferr("Write ate failed, rc=%d\n", rc);
}
nvs_block_advance(fs, &fs->ate_wra);
fs->data_wra = fs->ate_wra & ADDR_BLOCK_MASK;
finfo("block close, data_wra=0x%" PRIx32 "\n", fs->data_wra);
return 0;
}
/****************************************************************************
* Name: nvs_add_gc_done_ate
****************************************************************************/
static int nvs_add_gc_done_ate(FAR struct nvs_fs *fs)
{
struct nvs_ate gc_done_ate;
finfo("Adding gc done ate at %" PRIx32 "\n", fs->ate_wra & ADDR_OFFS_MASK);
memset(&gc_done_ate, fs->erasestate, sizeof(gc_done_ate));
gc_done_ate.id = NVS_SPECIAL_ATE_ID;
gc_done_ate.len = 0;
gc_done_ate.key_len = 0;
gc_done_ate.offset = fs->data_wra & ADDR_OFFS_MASK;
nvs_ate_crc8_update(&gc_done_ate);
return nvs_flash_ate_wrt(fs, &gc_done_ate);
}
/****************************************************************************
* Name: nvs_expire_ate
****************************************************************************/
static int nvs_expire_ate(FAR struct nvs_fs *fs, uint32_t addr)
{
uint8_t expired = 0;
return nvs_flash_wrt(fs, addr + offsetof(struct nvs_ate, expired),
&expired, sizeof(expired));
}
/****************************************************************************
* Name: nvs_gc
*
* Description:
* Garbage collection: the address ate_wra has been updated to the new
* block that has just been started. The data to gc is in the block
* after this new block.
*
****************************************************************************/
static int nvs_gc(FAR struct nvs_fs *fs)
{
int rc;
struct nvs_ate close_ate;
struct nvs_ate gc_ate;
uint32_t sec_addr;
uint32_t gc_addr;
uint32_t gc_prev_addr;
uint32_t data_addr;
uint32_t stop_addr;
finfo("gc: before gc, ate_wra %" PRIx32 "\n", fs->ate_wra);
sec_addr = (fs->ate_wra & ADDR_BLOCK_MASK);
nvs_block_advance(fs, &sec_addr);
gc_addr = sec_addr + fs->geo.erasesize - sizeof(struct nvs_ate);
finfo("gc: set, sec_addr %" PRIx32 ", gc_addr %" PRIx32 "\n", sec_addr,
gc_addr);
/* If the block is not closed don't do gc */
rc = nvs_flash_ate_rd(fs, gc_addr, &close_ate);
if (rc < 0)
{
/* Flash error */
return rc;
}
rc = nvs_ate_cmp_const(&close_ate, fs->erasestate);
if (!rc)
{
goto gc_done;
}
stop_addr = gc_addr - sizeof(struct nvs_ate);
if (nvs_close_ate_valid(fs, &close_ate))
{
gc_addr &= ADDR_BLOCK_MASK;
gc_addr += close_ate.offset;
}
else
{
rc = nvs_recover_last_ate(fs, &gc_addr);
if (rc)
{
return rc;
}
}
do
{
gc_prev_addr = gc_addr;
rc = nvs_prev_ate(fs, &gc_addr, &gc_ate);
if (rc)
{
return rc;
}
if (gc_ate.expired != fs->erasestate)
{
/* Deleted or old ate, ignore it */
continue;
}
if (!nvs_ate_valid(fs, &gc_ate))
{
continue;
}
if (gc_ate.id != NVS_SPECIAL_ATE_ID)
{
/* Copy needed */
finfo("Moving %" PRIu32 ", key_len %" PRIu16 ", len %" PRIu16 "\n",
gc_ate.id, gc_ate.key_len, gc_ate.len);
data_addr = gc_prev_addr & ADDR_BLOCK_MASK;
data_addr += gc_ate.offset;
gc_ate.offset = fs->data_wra & ADDR_OFFS_MASK;
nvs_ate_crc8_update(&gc_ate);
rc = nvs_flash_block_move(fs, data_addr,
gc_ate.key_len + gc_ate.len);
if (rc)
{
return rc;
}
rc = nvs_flash_ate_wrt(fs, &gc_ate);
if (rc)
{
return rc;
}
}
}
while (gc_prev_addr != stop_addr);
gc_done:
rc = nvs_add_gc_done_ate(fs);
if (rc)
{
return rc;
}
/* Erase the gc'ed block */
rc = nvs_flash_erase_block(fs, sec_addr);
if (rc)
{
return rc;
}
return 0;
}
/****************************************************************************
* Name: nvs_startup
****************************************************************************/
static int nvs_startup(FAR struct nvs_fs *fs)
{
int rc;
struct nvs_ate last_ate;
size_t empty_len;
uint32_t wlk_addr;
uint32_t second_addr;
uint32_t last_addr;
struct nvs_ate second_ate;
/* Initialize addr to 0 for the case fs->geo.neraseblocks == 0. This
* should never happen but both
* Coverity and GCC believe the contrary.
*/
uint32_t addr = 0;
uint16_t i;
uint16_t closed_blocks = 0;
fs->ate_wra = 0;
fs->data_wra = 0;
/* Check the number of blocks, it should be at least 2. */
if (fs->geo.neraseblocks < 2)
{
ferr("Configuration error - block count\n");
return -EINVAL;
}
/* Get the device geometry. (Casting to uintptr_t first eliminates
* complaints on some architectures where the sizeof long is different
* from the size of a pointer).
*/
rc = MTD_IOCTL(fs->mtd, MTDIOC_GEOMETRY,
(unsigned long)((uintptr_t)&(fs->geo)));
if (rc < 0)
{
ferr("ERROR: MTD ioctl(MTDIOC_GEOMETRY) failed: %d\n", rc);
return rc;
}
rc = MTD_IOCTL(fs->mtd, MTDIOC_ERASESTATE,
(unsigned long)((uintptr_t)&fs->erasestate));
if (rc < 0)
{
ferr("ERROR: MTD ioctl(MTDIOC_ERASESTATE) failed: %d\n", rc);
return rc;
}
/* Step through the blocks to find a open block following
* a closed block, this is where NVS can write.
*/
for (i = 0; i < fs->geo.neraseblocks; i++)
{
addr = (i << ADDR_BLOCK_SHIFT) +
(uint16_t)(fs->geo.erasesize - sizeof(struct nvs_ate));
rc = nvs_flash_cmp_const(fs, addr, fs->erasestate,
sizeof(struct nvs_ate));
fwarn("rc=%d\n", rc);
if (rc)
{
/* Closed block */
closed_blocks++;
nvs_block_advance(fs, &addr);
rc = nvs_flash_cmp_const(fs, addr, fs->erasestate,
sizeof(struct nvs_ate));
if (!rc)
{
/* Open block */
break;
}
}
fwarn("i=%" PRIu16 ", closed_blocks=%" PRIu16 ", addr=0x%" PRIx32 "\n",
i, closed_blocks, addr);
}
/* All blocks are closed, this is not a nvs fs */
if (closed_blocks == fs->geo.neraseblocks)
{
return -EDEADLK;
}
if (i == fs->geo.neraseblocks)
{
/* None of the blocks where closed, in most cases we can set
* the address to the first block, except when there are only
* two blocks. Then we can only set it to the first block if
* the last block contains no ate's. So we check this first
*/
rc = nvs_flash_cmp_const(fs, addr - sizeof(struct nvs_ate),
fs->erasestate, sizeof(struct nvs_ate));
if (!rc)
{
/* Empty ate */
nvs_block_advance(fs, &addr);
}
}
/* Addr contains address of closing ate in the most recent block,
* search for the last valid ate using the recover_last_ate routine
*/
rc = nvs_recover_last_ate(fs, &addr);
if (rc)
{
return rc;
}
/* Addr contains address of the last valid ate in the most recent block
* search for the first ate containing all cells erased, in the process
* also update fs->data_wra.
*/
fs->ate_wra = addr;
fs->data_wra = addr & ADDR_BLOCK_MASK;
finfo("recovered ate ate_wra=0x%" PRIx32 ", data_wra=0x%" PRIx32 "\n",
fs->ate_wra, fs->data_wra);
while (fs->ate_wra >= fs->data_wra)
{
rc = nvs_flash_ate_rd(fs, fs->ate_wra, &last_ate);
if (rc)
{
return rc;
}
rc = nvs_ate_cmp_const(&last_ate, fs->erasestate);
if (!rc)
{
/* Found 0xff empty location */
break;
}
if (nvs_ate_valid(fs, &last_ate))
{
/* Complete write of ate was performed */
fs->data_wra = addr & ADDR_BLOCK_MASK;
fs->data_wra += last_ate.offset + last_ate.key_len +
last_ate.len;
finfo("recovered data_wra=0x%" PRIx32 "\n", fs->data_wra);
}
fs->ate_wra -= sizeof(struct nvs_ate);
}
/* If the block after the write block is not empty, gc was interrupted
* we might need to restart gc if it has not yet finished. Otherwise
* just erase the block.
* When gc needs to be restarted, first erase the block otherwise the
* data might not fit into the block.
*/
addr = fs->ate_wra & ADDR_BLOCK_MASK;
nvs_block_advance(fs, &addr);
rc = nvs_flash_cmp_const(fs, addr, fs->erasestate, fs->geo.erasesize);
if (rc < 0)
{
return rc;
}
if (rc)
{
/* The block after fs->ate_wrt is not empty, look for a marker
* (gc_done_ate) that indicates that gc was finished.
*/
bool gc_done_marker = false;
struct nvs_ate gc_done_ate;
addr = fs->ate_wra + sizeof(struct nvs_ate);
while ((addr & ADDR_OFFS_MASK) <
(fs->geo.erasesize - sizeof(struct nvs_ate)))
{
rc = nvs_flash_ate_rd(fs, addr, &gc_done_ate);
if (rc)
{
return rc;
}
if (nvs_ate_valid(fs, &gc_done_ate) &&
(gc_done_ate.id == NVS_SPECIAL_ATE_ID) &&
(gc_done_ate.len == 0))
{
gc_done_marker = true;
break;
}
addr += sizeof(struct nvs_ate);
}
if (gc_done_marker)
{
/* Erase the next block */
fwarn("GC Done marker found\n");
addr = fs->ate_wra & ADDR_BLOCK_MASK;
nvs_block_advance(fs, &addr);
rc = nvs_flash_erase_block(fs, addr);
goto end;
}
fwarn("No GC Done marker found: restarting gc\n");
rc = nvs_flash_erase_block(fs, fs->ate_wra);
if (rc)
{
return rc;
}
fs->ate_wra &= ADDR_BLOCK_MASK;
fs->ate_wra += (fs->geo.erasesize - 2 * sizeof(struct nvs_ate));
fs->data_wra = (fs->ate_wra & ADDR_BLOCK_MASK);
finfo("GC when data_wra=0x%" PRIx32 "\n", fs->data_wra);
rc = nvs_gc(fs);
goto end;
}
/* Possible data write after last ate write, update data_wra */
while (fs->ate_wra > fs->data_wra)
{
empty_len = fs->ate_wra - fs->data_wra;
rc = nvs_flash_cmp_const(fs, fs->data_wra, fs->erasestate, empty_len);
if (rc < 0)
{
return rc;
}
if (!rc)
{
break;
}
fs->data_wra += NVS_CORRUPT_DATA_SKIP_STEP;
finfo("update for powerloss data write, data_wra=0x%" PRIx32 "\n",
fs->data_wra);
}
/* If the ate_wra is pointing to the first ate write location in a
* block and data_wra is not 0, erase the block as it contains no
* valid data (this also avoids closing a block without any data).
*/
if (((fs->ate_wra + 2 * sizeof(struct nvs_ate)) == fs->geo.erasesize) &&
(fs->data_wra != (fs->ate_wra & ADDR_BLOCK_MASK)))
{
rc = nvs_flash_erase_block(fs, fs->ate_wra);
if (rc)
{
return rc;
}
fs->data_wra = fs->ate_wra & ADDR_BLOCK_MASK;
finfo("erase due to no data, data_wra=0x%" PRIx32 "\n",
fs->data_wra);
}
/* Check if there exists an old entry with the same id and key
* as the newest entry.
* If so, power loss occured before writing the old entry id as expired.
* We need to set old entry expired.
*/
wlk_addr = fs->ate_wra;
while (1)
{
last_addr = wlk_addr;
rc = nvs_prev_ate(fs, &wlk_addr, &last_ate);
if (rc)
{
return rc;
}
/* Skip last one */
if (wlk_addr == fs->ate_wra)
{
break;
}
if (nvs_ate_valid(fs, &last_ate)
&& (last_ate.id != NVS_SPECIAL_ATE_ID))
{
finfo("ate found at 0x%" PRIx32 ", id %" PRIu32 ", "
"key_len %" PRIu16 ", offset %" PRIu16 "\n",
last_addr, last_ate.id, last_ate.key_len, last_ate.offset);
while (1)
{
second_addr = wlk_addr;
rc = nvs_prev_ate(fs, &wlk_addr, &second_ate);
if (rc)
{
return rc;
}
if (nvs_ate_valid(fs, &second_ate)
&& second_ate.id == last_ate.id
&& second_ate.expired == fs->erasestate)
{
finfo("same id at 0x%" PRIx32 ", key_len %" PRIu16 ", "
"offset %" PRIu16 "\n",
second_addr, second_ate.key_len, second_ate.offset);
if ((second_ate.key_len == last_ate.key_len) &&
!nvs_flash_direct_cmp(fs,
(last_addr & ADDR_BLOCK_MASK) +
last_ate.offset,
(second_addr & ADDR_BLOCK_MASK) +
second_ate.offset,
last_ate.key_len))
{
finfo("old ate found at 0x%" PRIx32 "\n", second_addr);
rc = nvs_expire_ate(fs, second_addr);
if (rc < 0)
{
ferr("expire ate failed, addr %" PRIx32 "\n",
second_addr);
return rc;
}
goto end;
}
else
{
fwarn("hash conflict\n");
}
}
if (wlk_addr == fs->ate_wra)
{
goto end;
}
}
}
}
end:
/* If the block is empty, add a gc done ate to avoid having insufficient
* space when doing gc.
*/
if ((!rc) && ((fs->ate_wra & ADDR_OFFS_MASK) ==
(fs->geo.erasesize - 2 * sizeof(struct nvs_ate))))
{
rc = nvs_add_gc_done_ate(fs);
}
finfo("%" PRIu32 " Eraseblocks of %" PRIu32 " bytes\n",
fs->geo.neraseblocks, fs->geo.erasesize);
finfo("alloc wra: %" PRIu32 ", 0x%" PRIx32 "\n",
(fs->ate_wra >> ADDR_BLOCK_SHIFT), (fs->ate_wra & ADDR_OFFS_MASK));
finfo("data wra: %" PRIu32 ", 0x%" PRIx32 "\n",
(fs->data_wra >> ADDR_BLOCK_SHIFT), (fs->data_wra & ADDR_OFFS_MASK));
return rc;
}
/****************************************************************************
* Name: nvs_read_entry
*
* Description:
* Read An entry from the file system. But expired ones will return
* -ENOENT.
*
* Input Parameters:
* fs - Pointer to file system.
* key - Key of the entry to be read.
* key_size - Size of key.
* data - Pointer to data buffer.
* len - Number of bytes to be read.
* ate_addr - The addr of found ate.
*
* Returned Value:
* Number of bytes read. On success, it will be equal to the number
* of bytes requested to be read. When the return value is larger than the
* number of bytes requested to read this indicates not all bytes were
* read, and more data is available. On error returns -ERRNO code.
*
****************************************************************************/
static ssize_t nvs_read_entry(FAR struct nvs_fs *fs, FAR const uint8_t *key,
size_t key_size, FAR void *data, size_t len,
FAR uint32_t *ate_addr)
{
int rc;
uint32_t wlk_addr;
uint32_t rd_addr;
uint32_t hist_addr;
struct nvs_ate wlk_ate;
uint32_t hash_id;
hash_id = nvs_fnv_hash(key, key_size) % 0xfffffffd + 1;
wlk_addr = fs->ate_wra;
rd_addr = wlk_addr;
do
{
rd_addr = wlk_addr;
hist_addr = wlk_addr;
rc = nvs_prev_ate(fs, &wlk_addr, &wlk_ate);
if (rc)
{
ferr("Walk to previous ate failed, rc=%d\n", rc);
return rc;
}
if ((wlk_ate.id == hash_id) && (nvs_ate_valid(fs, &wlk_ate)))
{
if ((wlk_ate.key_len == key_size)
&& (!nvs_flash_block_cmp(fs,
(rd_addr & ADDR_BLOCK_MASK) + wlk_ate.offset, key, key_size)))
{
/* It is old or deleted, return -ENOENT */
if (wlk_ate.expired != fs->erasestate)
{
return -ENOENT;
}
break;
}
else
{
fwarn("hash conflict\n");
}
}
if (wlk_addr == fs->ate_wra)
{
return -ENOENT;
}
}
while (true);
if (data)
{
rd_addr &= ADDR_BLOCK_MASK;
rd_addr += wlk_ate.offset + wlk_ate.key_len;
rc = nvs_flash_rd(fs, rd_addr, data,
MIN(len, wlk_ate.len));
if (rc)
{
ferr("Data read failed, rc=%d\n", rc);
return rc;
}
}
if (ate_addr)
{
*ate_addr = hist_addr;
}
return wlk_ate.len;
}
/****************************************************************************
* Name: nvs_write
*
* Description:
* Write an entry to the file system.
*
* Input Parameters:
* fs - Pointer to file system.
* pdata - Pointer to data buffer.
*
* Returned Value:
* Number of bytes written. On success, it will be equal to the
* number of bytes requested to be written. On error returns -ERRNO code.
*
****************************************************************************/
static ssize_t nvs_write(FAR struct nvs_fs *fs,
FAR struct config_data_s *pdata)
{
int rc;
int gc_count;
size_t data_size;
size_t key_size;
struct nvs_ate wlk_ate;
uint32_t wlk_addr;
uint32_t rd_addr;
uint32_t hist_addr;
uint16_t required_space = 0;
bool prev_found = false;
uint32_t hash_id;
uint16_t block_to_write_befor_gc;
#ifdef CONFIG_MTD_CONFIG_NAMED
FAR const uint8_t *key;
#else
uint8_t key[sizeof(pdata->id) + sizeof(pdata->instance)];
#endif
#ifdef CONFIG_MTD_CONFIG_NAMED
key = (FAR const uint8_t *)pdata->name;
key_size = strlen(pdata->name) + 1;
#else
memcpy(key, &pdata->id, sizeof(pdata->id));
memcpy(key + sizeof(pdata->id), &pdata->instance, sizeof(pdata->instance));
key_size = sizeof(pdata->id) + sizeof(pdata->instance);
#endif
/* Data now contains input data and input key, input key first. */
data_size = key_size + pdata->len;
/* The maximum data size is block size - 3 ate
* where: 1 ate for data, 1 ate for block close, 1 ate for gc done.
*/
finfo("key_size=%zu, len=%zu\n", key_size, pdata->len);
if ((data_size > (fs->geo.erasesize - 3 * sizeof(struct nvs_ate))) ||
((pdata->len > 0) && (pdata->configdata == NULL)))
{
return -EINVAL;
}
/* Calc hash id of key. */
hash_id = nvs_fnv_hash(key, key_size) % 0xfffffffd + 1;
/* Find latest entry with same id. */
wlk_addr = fs->ate_wra;
while (1)
{
rd_addr = wlk_addr;
hist_addr = wlk_addr;
rc = nvs_prev_ate(fs, &wlk_addr, &wlk_ate);
if (rc)
{
return rc;
}
if ((wlk_ate.id == hash_id) && (nvs_ate_valid(fs, &wlk_ate)))
{
if ((wlk_ate.key_len == key_size)
&& !nvs_flash_block_cmp(fs,
(rd_addr & ADDR_BLOCK_MASK) +
wlk_ate.offset, key, key_size))
{
prev_found = true;
break;
}
else
{
fwarn("hash conflict\n");
}
}
if (wlk_addr == fs->ate_wra)
{
break;
}
}
if (prev_found)
{
finfo("Previous found\n");
/* Previous entry found. */
rd_addr &= ADDR_BLOCK_MASK;
if (pdata->len == 0)
{
/* If prev ate is expired, it is deleted. */
if (wlk_ate.expired != fs->erasestate)
{
/* Skip delete entry as it is already the
* last one.
*/
return 0;
}
else
{
rc = nvs_expire_ate(fs, hist_addr);
if (rc < 0)
{
ferr("expire ate failed, addr %" PRIx32 "\n", hist_addr);
return rc;
}
/* Delete now requires no extra space, so skip write and gc. */
finfo("nvs_delete success\n");
return 0;
}
}
else if (pdata->len == wlk_ate.len &&
wlk_ate.expired == fs->erasestate)
{
/* Do not try to compare if lengths are not equal
* or prev one is deleted.
* Compare the data and if equal return 0.
*/
rd_addr += wlk_ate.offset + wlk_ate.key_len;
rc = nvs_flash_block_cmp(fs, rd_addr, pdata->configdata,
pdata->len);
if (rc <= 0)
{
return rc;
}
}
}
else
{
/* Skip delete entry for non-existing entry. */
if (pdata->len == 0)
{
return 0;
}
}
/* Leave space for gc_done ate */
required_space = data_size + sizeof(struct nvs_ate);
gc_count = 0;
block_to_write_befor_gc = fs->ate_wra >> ADDR_BLOCK_SHIFT;
while (1)
{
if (gc_count == fs->geo.neraseblocks)
{
/* Gc'ed all blocks, no extra space will be created
* by extra gc.
*/
return -ENOSPC;
}
if (fs->ate_wra >= fs->data_wra + required_space)
{
/* Nvs is changed after gc, we will look for the old ate.
*/
if (prev_found && wlk_ate.expired == fs->erasestate)
{
finfo("prev entry exists, search for it\n");
/* If gc touched second latest ate, search for it again */
if (gc_count >= fs->geo.neraseblocks - 1 -
(block_to_write_befor_gc + fs->geo.neraseblocks -
(hist_addr >> ADDR_BLOCK_SHIFT))
% fs->geo.neraseblocks)
{
rc = nvs_read_entry(fs, key, key_size, NULL, 0,
&hist_addr);
finfo("relocate for prev entry, %" PRIx32 ", "
"rc %d\n",
hist_addr, rc);
if (rc < 0)
{
ferr("read prev entry failed\n");
return rc;
}
}
}
finfo("Write entry, ate_wra=0x%" PRIx32 ", "
"data_wra=0x%" PRIx32 "\n",
fs->ate_wra, fs->data_wra);
rc = nvs_flash_wrt_entry(fs, hash_id, key, key_size,
pdata->configdata, pdata->len);
if (rc)
{
fwarn("Write entry failed\n");
return rc;
}
finfo("Write entry success\n");
/* Expiring the old ate if exists.
* After this operation, only the latest ate is valid.
* Expire the old one only if it is not deleted before(Or it is
* already expired)
*/
if (prev_found && wlk_ate.expired == fs->erasestate)
{
rc = nvs_expire_ate(fs, hist_addr);
finfo("expir prev entry, %" PRIx32 ", rc %d\n",
hist_addr, rc);
if (rc < 0)
{
ferr("expire ate failed, addr %" PRIx32 "\n",
hist_addr);
return rc;
}
}
break;
}
rc = nvs_block_close(fs);
if (rc)
{
return rc;
}
rc = nvs_gc(fs);
if (rc)
{
return rc;
}
gc_count++;
finfo("Gc count=%d\n", gc_count);
}
finfo("nvs_write success\n");
return 0;
}
/****************************************************************************
* Name: nvs_delete
*
* Description:
* Delete an entry from the file system.
*
* Input Parameters:
* fs - Pointer to file system.
* pdata - Pointer to data buffer.
*
* Returned Value:
* 0 on success, -ERRNO errno code if error.
*
****************************************************************************/
static int nvs_delete(FAR struct nvs_fs *fs, FAR struct config_data_s *pdata)
{
/* If user wants to operate /dev/config directly.
* Set len=0 to trigger delete, so that user doesn't need to do that.
*/
pdata->len = 0;
return nvs_write(fs, pdata);
}
/****************************************************************************
* Name: nvs_read
*
* Description:
* Read an entry from the file system.
*
* Input Parameters:
* fs - Pointer to file system.
* pdata - Pointer to data buffer.
*
* Returned Value:
* 0 on success, -ERRNO errno code if error.
*
****************************************************************************/
static ssize_t nvs_read(FAR struct nvs_fs *fs,
FAR struct config_data_s *pdata)
{
size_t key_size;
ssize_t ret;
#ifdef CONFIG_MTD_CONFIG_NAMED
FAR const uint8_t *key;
#else
uint8_t key[sizeof(pdata->id) + sizeof(pdata->instance)];
#endif
if (pdata == NULL || pdata->len == 0)
{
return -EINVAL;
}
#ifdef CONFIG_MTD_CONFIG_NAMED
key = (FAR const uint8_t *)pdata->name;
key_size = strlen(pdata->name) + 1;
#else
memcpy(key, &pdata->id, sizeof(pdata->id));
memcpy(key + sizeof(pdata->id), &pdata->instance, sizeof(pdata->instance));
key_size = sizeof(pdata->id) + sizeof(pdata->instance);
#endif
ret = nvs_read_entry(fs, key, key_size, pdata->configdata, pdata->len,
NULL);
if (ret > 0)
{
pdata->len = ret;
return 0;
}
return ret;
}
/****************************************************************************
* Name: nvs_next
*
* Description:
* Get the next KV in database.
*
* Input Parameters:
* fs - Pointer to file system.
* pdata - Pointer to data buffer.
* first - true if we are reading the first KV.
*
* Returned Value:
* 0 on success, -ERRNO errno code if error.
*
****************************************************************************/
static int nvs_next(FAR struct nvs_fs *fs,
FAR struct config_data_s *pdata, bool first)
{
int rc;
struct nvs_ate step_ate;
uint32_t rd_addr;
#ifdef CONFIG_MTD_CONFIG_NAMED
FAR uint8_t *key = (FAR uint8_t *)pdata->name;
#else
uint8_t key[sizeof(pdata->id) + sizeof(pdata->instance)];
#endif
if (first)
{
fs->step_addr = fs->ate_wra;
}
else
{
if (fs->step_addr == fs->ate_wra)
{
return -ENOENT;
}
}
do
{
rd_addr = fs->step_addr;
rc = nvs_prev_ate(fs, &(fs->step_addr), &step_ate);
if (rc)
{
return rc;
}
if (nvs_ate_valid(fs, &step_ate)
&& step_ate.id != NVS_SPECIAL_ATE_ID
&& step_ate.expired == fs->erasestate)
{
break;
}
if (fs->step_addr == fs->ate_wra)
{
return -ENOENT;
}
}
while (true);
#ifdef CONFIG_MTD_CONFIG_NAMED
rc = nvs_flash_rd(fs, (rd_addr & ADDR_BLOCK_MASK) + step_ate.offset,
key, MIN(step_ate.key_len, CONFIG_MTD_CONFIG_NAME_LEN));
if (rc)
{
ferr("Key read failed, rc=%d\n", rc);
return rc;
}
key[CONFIG_MTD_CONFIG_NAME_LEN - 1] = 0;
#else
rc = nvs_flash_rd(fs, (rd_addr & ADDR_BLOCK_MASK) + step_ate.offset,
key, MIN(sizeof(key), step_ate.key_len));
if (rc)
{
ferr("Key read failed, rc=%d\n", rc);
return rc;
}
memcpy(pdata->id, key, sizeof(pdata->id));
memcpy(pdata->instance, key + sizeof(pdata->id), sizeof(pdata->instance));
#endif
rc = nvs_flash_rd(fs, (rd_addr & ADDR_BLOCK_MASK) + step_ate.offset +
step_ate.key_len, pdata->configdata,
MIN(pdata->len, step_ate.len));
if (rc)
{
ferr("Value read failed, rc=%d\n", rc);
return rc;
}
pdata->len = MIN(pdata->len, step_ate.len);
return OK;
}
/****************************************************************************
* Name: mtdconfig_open
****************************************************************************/
static int mtdconfig_open(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: mtdconfig_close
****************************************************************************/
static int mtdconfig_close(FAR struct file *filep)
{
return OK;
}
/****************************************************************************
* Name: mtdconfig_read
****************************************************************************/
static ssize_t mtdconfig_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
return -ENOTSUP;
}
/****************************************************************************
* Name: mtdconfig_ioctl
****************************************************************************/
static int mtdconfig_ioctl(FAR struct file *filep, int cmd,
unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct nvs_fs *fs = (FAR struct nvs_fs *)inode->i_private;
FAR struct config_data_s *pdata = (FAR struct config_data_s *)arg;
int ret = -ENOTTY;
ret = nxmutex_lock(&fs->nvs_lock);
if (ret < 0)
{
return ret;
}
switch (cmd)
{
case CFGDIOC_GETCONFIG:
/* Read a nvs item. */
ret = nvs_read(fs, pdata);
break;
case CFGDIOC_SETCONFIG:
/* Write a nvs item. */
ret = nvs_write(fs, pdata);
break;
case CFGDIOC_DELCONFIG:
/* Delete a nvs item. */
ret = nvs_delete(fs, pdata);
break;
case CFGDIOC_FIRSTCONFIG:
/* Get the first item. */
ret = nvs_next(fs, pdata, true);
break;
case CFGDIOC_NEXTCONFIG:
/* Get the next item. */
ret = nvs_next(fs, pdata, false);
break;
case MTDIOC_BULKERASE:
/* Call the MTD's ioctl for this. */
ret = MTD_IOCTL(fs->mtd, cmd, arg);
if (ret >= 0)
{
ret = nvs_startup(fs);
}
break;
}
nxmutex_unlock(&fs->nvs_lock);
return ret;
}
/****************************************************************************
* Name: mtdconfig_poll
****************************************************************************/
static int mtdconfig_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup)
{
if (setup)
{
poll_notify(&fds, 1, POLLIN | POLLOUT);
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mtdconfig_register
*
* Description:
* Register a /dev/config device backed by an fail-safe NVS.
*
****************************************************************************/
int mtdconfig_register(FAR struct mtd_dev_s *mtd)
{
int ret;
FAR struct nvs_fs *fs;
fs = (FAR struct nvs_fs *)kmm_malloc(sizeof(struct nvs_fs));
if (fs == NULL)
{
return -ENOMEM;
}
/* Initialize the mtdnvs device structure */
fs->mtd = mtd;
ret = nxmutex_init(&fs->nvs_lock);
if (ret < 0)
{
ferr("ERROR: nxmutex_init failed: %d\n", ret);
goto errout;
}
ret = nvs_startup(fs);
if (ret < 0)
{
ferr("ERROR: nvs_init failed: %d\n", ret);
goto mutex_err;
}
ret = register_driver("/dev/config", &g_mtdnvs_fops, 0666, fs);
if (ret < 0)
{
ferr("ERROR: register mtd config failed: %d\n", ret);
goto mutex_err;
}
return ret;
mutex_err:
nxmutex_destroy(&fs->nvs_lock);
errout:
kmm_free(fs);
return ret;
}
/****************************************************************************
* Name: mtdconfig_unregister
*
* Description:
* Unregister a /dev/config device backed by an fail-safe NVS.
*
****************************************************************************/
int mtdconfig_unregister(void)
{
int ret;
struct file file;
FAR struct inode *inode;
FAR struct nvs_fs *fs;
ret = file_open(&file, "/dev/config", 0);
if (ret < 0)
{
ferr("ERROR: open /dev/config failed: %d\n", ret);
return ret;
}
inode = file.f_inode;
fs = (FAR struct nvs_fs *)inode->i_private;
nxmutex_destroy(&fs->nvs_lock);
kmm_free(fs);
file_close(&file);
unregister_driver("/dev/config");
return OK;
}
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