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/*
* Copyright (C) 2013 Henrik Nordstrom <henrik@henriknordstrom.net>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <part.h>
#include <os.h>
#include <malloc.h>
#include <sandboxblockdev.h>
#include <asm/errno.h>
static struct host_block_dev host_devices[CONFIG_HOST_MAX_DEVICES];
static struct host_block_dev *find_host_device(int dev)
{
if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
return &host_devices[dev];
return NULL;
}
static unsigned long host_block_read(struct blk_desc *block_dev,
unsigned long start, lbaint_t blkcnt,
void *buffer)
{
int dev = block_dev->dev;
struct host_block_dev *host_dev = find_host_device(dev);
if (!host_dev)
return -1;
if (os_lseek(host_dev->fd,
start * host_dev->blk_dev.blksz,
OS_SEEK_SET) == -1) {
printf("ERROR: Invalid position\n");
return -1;
}
ssize_t len = os_read(host_dev->fd, buffer,
blkcnt * host_dev->blk_dev.blksz);
if (len >= 0)
return len / host_dev->blk_dev.blksz;
return -1;
}
static unsigned long host_block_write(struct blk_desc *block_dev,
unsigned long start, lbaint_t blkcnt,
const void *buffer)
{
int dev = block_dev->dev;
struct host_block_dev *host_dev = find_host_device(dev);
if (os_lseek(host_dev->fd,
start * host_dev->blk_dev.blksz,
OS_SEEK_SET) == -1) {
printf("ERROR: Invalid position\n");
return -1;
}
ssize_t len = os_write(host_dev->fd, buffer, blkcnt *
host_dev->blk_dev.blksz);
if (len >= 0)
return len / host_dev->blk_dev.blksz;
return -1;
}
int host_dev_bind(int dev, char *filename)
{
struct host_block_dev *host_dev = find_host_device(dev);
if (!host_dev)
return -1;
if (host_dev->blk_dev.priv) {
os_close(host_dev->fd);
host_dev->blk_dev.priv = NULL;
}
if (host_dev->filename)
free(host_dev->filename);
if (filename && *filename) {
host_dev->filename = strdup(filename);
} else {
host_dev->filename = NULL;
return 0;
}
host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
if (host_dev->fd == -1) {
printf("Failed to access host backing file '%s'\n",
host_dev->filename);
return 1;
}
struct blk_desc *blk_dev = &host_dev->blk_dev;
blk_dev->if_type = IF_TYPE_HOST;
blk_dev->priv = host_dev;
blk_dev->blksz = 512;
blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
blk_dev->block_read = host_block_read;
blk_dev->block_write = host_block_write;
blk_dev->dev = dev;
blk_dev->part_type = PART_TYPE_UNKNOWN;
init_part(blk_dev);
return 0;
}
int host_get_dev_err(int dev, struct blk_desc **blk_devp)
{
struct host_block_dev *host_dev = find_host_device(dev);
if (!host_dev)
return -ENODEV;
if (!host_dev->blk_dev.priv)
return -ENOENT;
*blk_devp = &host_dev->blk_dev;
return 0;
}
struct blk_desc *host_get_dev(int dev)
{
struct blk_desc *blk_dev;
if (host_get_dev_err(dev, &blk_dev))
return NULL;
return blk_dev;
}
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