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ftl: implemented ftl_mount() to seamlessly wrap flash devices

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S.J.R. van Schaik 2017-05-19 16:21:11 +02:00
parent 6f7fec2965
commit b6c5d5bbda
2 changed files with 99 additions and 0 deletions
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2
include/ftl.h
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@ -35,3 +35,5 @@ int ftl_read(struct ftl_map *map, void *data, size_t len, uint32_t va);
int ftl_trim(struct ftl_map *map, uint32_t va);
uint32_t ftl_get_size(const struct ftl_map *map);
uint32_t ftl_get_capacity(const struct ftl_map *map);
struct flash_dev *ftl_mount(struct flash_dev *raw_dev);

97
source/ftl/dev.c Normal file
View file

@ -0,0 +1,97 @@
#include <stdlib.h>
#include <string.h>
#include <flash.h>
#include <ftl.h>
static size_t ftl_flash_get_size(struct flash_dev *dev);
static size_t ftl_flash_get_capacity(struct flash_dev *dev);
static int ftl_flash_read(struct flash_dev *dev, uint32_t addr, void *data,
size_t len);
static int ftl_flash_write(struct flash_dev *dev, uint32_t addr,
const void *data, size_t len);
static int ftl_flash_erase(struct flash_dev *dev, uint32_t addr,
size_t block_size);
static struct flash_ops ftl_flash_ops = {
.get_size = ftl_flash_get_size,
.get_capacity = ftl_flash_get_capacity,
.read = ftl_flash_read,
.write = ftl_flash_write,
/* TODO: implement default function to perform a copy. */
.copy = NULL,
.erase = ftl_flash_erase,
};
static size_t ftl_flash_get_size(struct flash_dev *dev)
{
struct ftl_map *map = dev->priv;
return ftl_get_size(map);
}
static size_t ftl_flash_get_capacity(struct flash_dev *dev)
{
struct ftl_map *map = dev->priv;
return ftl_get_capacity(map);
}
static int ftl_flash_read(struct flash_dev *dev, uint32_t addr, void *data,
size_t len)
{
struct ftl_map *map = dev->priv;
return ftl_read(map, data, len, addr);
}
static int ftl_flash_write(struct flash_dev *dev, uint32_t addr,
const void *data, size_t len)
{
struct ftl_map *map = dev->priv;
/* TODO: support len */
(void)len;
return ftl_write(map, addr, data);
}
static int ftl_flash_erase(struct flash_dev *dev, uint32_t addr,
size_t block_size)
{
struct ftl_map *map = dev->priv;
/* TODO */
(void)block_size;
return ftl_trim(map, addr);
}
struct flash_dev *ftl_mount(struct flash_dev *raw_dev)
{
struct flash_dev *dev;
struct ftl_map *map;
if (!(dev = malloc(sizeof *dev)))
return NULL;
if (!(map = malloc(sizeof *map)))
goto err_free_dev;
if (ftl_init_map(map, raw_dev) < 0)
goto err_free_map;
/* TODO: inspect return value? */
ftl_resume_map(map);
dev->ops = &ftl_flash_ops;
dev->priv = map;
return dev;
err_free_map:
free(map);
err_free_dev:
free(dev);
return NULL;
}