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/* Copyright 2013-2014 IBM Corp.
*
* Licensed 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.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <ccan/container_of/container_of.h>
#include <mtd/mtd-abi.h>
#include "libflash.h"
#include "blocklevel.h"
struct file_data {
int fd;
char *name;
char *path;
struct blocklevel_device bl;
};
static int file_release(struct blocklevel_device *bl)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
close(file_data->fd);
file_data->fd = -1;
return 0;
}
static int file_reacquire(struct blocklevel_device *bl)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
int fd;
fd = open(file_data->path, O_RDWR);
if (fd == -1)
return FLASH_ERR_PARM_ERROR;
file_data->fd = fd;
return 0;
}
static int file_read(struct blocklevel_device *bl, uint32_t pos, void *buf, uint32_t len)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
int rc, count = 0;
rc = lseek(file_data->fd, pos, SEEK_SET);
/* errno should remain set */
if (rc != pos)
return FLASH_ERR_PARM_ERROR;
while (count < len) {
rc = read(file_data->fd, buf, len);
/* errno should remain set */
if (rc == -1 || rc == 0)
return FLASH_ERR_BAD_READ;
count += rc;
}
return 0;
}
static int file_write(struct blocklevel_device *bl, uint32_t dst, const void *src,
uint32_t len)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
int rc, count = 0;
rc = lseek(file_data->fd, dst, SEEK_SET);
/* errno should remain set */
if (rc != dst)
return FLASH_ERR_PARM_ERROR;
while (count < len) {
rc = write(file_data->fd, src, len);
/* errno should remain set */
if (rc == -1)
return FLASH_ERR_VERIFY_FAILURE;
count += rc;
}
return 0;
}
/*
* Due to to the fact these interfaces are ultimately supposed to deal with
* flash, an erase function must be implemented even when the flash images
* are backed by regular files.
* Also, erasing flash leaves all the bits set to 1. This may be expected
* by higher level functions so this function should also emulate that
*/
static int file_erase(struct blocklevel_device *bl, uint32_t dst, uint32_t len)
{
unsigned long long int d = ULLONG_MAX;
int i = 0;
int rc;
while (len - i > 0) {
rc = file_write(bl, dst + i, &d, len - i > sizeof(d) ? sizeof(d) : len - i);
if (rc)
return rc;
i += sizeof(d);
}
return 0;
}
static int mtd_erase(struct blocklevel_device *bl, uint32_t dst, uint32_t len)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
struct erase_info_user erase_info = {
.start = dst,
.length = len
};
if (ioctl(file_data->fd, MEMERASE, &erase_info) == -1)
return FLASH_ERR_PARM_ERROR;
return 0;
}
static int get_info_name(struct file_data *file_data, char **name)
{
char *path, *lpath;
int len;
struct stat st;
if (asprintf(&path, "/proc/self/fd/%d", file_data->fd) == -1)
return FLASH_ERR_MALLOC_FAILED;
if (lstat(path, &st)) {
free(path);
return FLASH_ERR_PARM_ERROR;
}
lpath = malloc(st.st_size + 1);
if (!lpath) {
free(path);
return FLASH_ERR_MALLOC_FAILED;
}
len = readlink(path, lpath, st.st_size +1);
if (len == -1) {
free(path);
free(lpath);
return FLASH_ERR_PARM_ERROR;
}
lpath[len] = '\0';
*name = lpath;
free(path);
return 0;
}
static int mtd_get_info(struct blocklevel_device *bl, const char **name,
uint32_t *total_size, uint32_t *erase_granule)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
struct mtd_info_user mtd_info;
int rc;
rc = ioctl(file_data->fd, MEMGETINFO, &mtd_info);
if (rc == -1)
return FLASH_ERR_BAD_READ;
if (total_size)
*total_size = mtd_info.size;
if (erase_granule)
*erase_granule = mtd_info.erasesize;
if (name) {
rc = get_info_name(file_data, &(file_data->name));
if (rc)
return rc;
*name = file_data->name;
}
return 0;
}
static int file_get_info(struct blocklevel_device *bl, const char **name,
uint32_t *total_size, uint32_t *erase_granule)
{
struct file_data *file_data = container_of(bl, struct file_data, bl);
struct stat st;
int rc;
if (fstat(file_data->fd, &st))
return FLASH_ERR_PARM_ERROR;
if (total_size)
*total_size = st.st_size;
if (erase_granule)
*erase_granule = 1;
if (name) {
rc = get_info_name(file_data, &(file_data->name));
if (rc)
return rc;
*name = file_data->name;
}
return 0;
}
int file_init(int fd, struct blocklevel_device **bl)
{
struct file_data *file_data;
struct stat sbuf;
if (!bl)
return FLASH_ERR_PARM_ERROR;
*bl = NULL;
file_data = calloc(1, sizeof(struct file_data));
if (!file_data)
return FLASH_ERR_MALLOC_FAILED;
file_data->fd = fd;
file_data->bl.reacquire = &file_reacquire;
file_data->bl.release = &file_release;
file_data->bl.read = &file_read;
file_data->bl.write = &file_write;
file_data->bl.erase = &file_erase;
file_data->bl.get_info = &file_get_info;
file_data->bl.erase_mask = 0;
/*
* If the blocklevel_device is only inited with file_init() then keep
* alive is assumed, as fd will change otherwise and this may break
* callers assumptions.
*/
file_data->bl.keep_alive = 1;
/*
* Unfortunately not all file descriptors are created equal...
* Here we check to see if the file descriptor is to an MTD device, in
* which case we have to erase and get the size of it differently.
*/
if (fstat(file_data->fd, &sbuf) == -1)
goto out;
/* Won't be able to handle other than MTD devices for now */
if (S_ISCHR(sbuf.st_mode)) {
file_data->bl.erase = &mtd_erase;
file_data->bl.get_info = &mtd_get_info;
file_data->bl.flags = WRITE_NEED_ERASE;
mtd_get_info(&file_data->bl, NULL, NULL, &(file_data->bl.erase_mask));
file_data->bl.erase_mask--;
} else if (!S_ISREG(sbuf.st_mode)) {
/* If not a char device or a regular file something went wrong */
goto out;
}
*bl = &(file_data->bl);
return 0;
out:
free(file_data);
return FLASH_ERR_PARM_ERROR;
}
int file_init_path(const char *path, int *r_fd, bool keep_alive,
struct blocklevel_device **bl)
{
int fd, rc;
char *path_ptr = NULL;
struct file_data *file_data;
if (!path || !bl)
return FLASH_ERR_PARM_ERROR;
fd = open(path, O_RDWR);
if (fd == -1)
return FLASH_ERR_PARM_ERROR;
/*
* strdup() first so don't have to deal with malloc failure after
* file_init()
*/
path_ptr = strdup(path);
if (!path_ptr) {
rc = FLASH_ERR_MALLOC_FAILED;
goto out;
}
rc = file_init(fd, bl);
if (rc)
goto out;
file_data = container_of(*bl, struct file_data, bl);
file_data->bl.keep_alive = keep_alive;
file_data->path = path_ptr;
if (r_fd)
*r_fd = fd;
return rc;
out:
free(path_ptr);
close(fd);
return rc;
}
void file_exit(struct blocklevel_device *bl)
{
struct file_data *file_data;
if (bl) {
free(bl->ecc_prot.prot);
file_data = container_of(bl, struct file_data, bl);
free(file_data->name);
free(file_data->path);
free(file_data);
}
}
void file_exit_close(struct blocklevel_device *bl)
{
struct file_data *file_data;
if (bl) {
file_data = container_of(bl, struct file_data, bl);
close(file_data->fd);
file_exit(bl);
}
}
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