f4d8de48f5
Provide a way to use any host file or device as a block device in U-Boot. This can be used to provide filesystem access within U-Boot to an ext2 image file on the host, for example. The support is plumbed into the filesystem and partition interfaces. We don't want to print a message in the driver every time we find a missing device. Pass the information back to the caller where a message can be printed if desired. Signed-off-by: Henrik Nordström <henrik@henriknordstrom.net> Signed-off-by: Simon Glass <sjg@chromium.org> - Removed change to part.c get_device_and_partition() Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Simon Glass <sjg@chromium.org>
125 lines
2.8 KiB
C
125 lines
2.8 KiB
C
/*
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* Copyright (C) 2013 Henrik Nordstrom <henrik@henriknordstrom.net>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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#include <common.h>
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#include <part.h>
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#include <os.h>
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#include <malloc.h>
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#include <sandboxblockdev.h>
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#include <asm/errno.h>
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static struct host_block_dev host_devices[CONFIG_HOST_MAX_DEVICES];
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static struct host_block_dev *find_host_device(int dev)
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{
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if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
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return &host_devices[dev];
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return NULL;
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}
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static unsigned long host_block_read(int dev, unsigned long start,
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lbaint_t blkcnt, void *buffer)
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{
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struct host_block_dev *host_dev = find_host_device(dev);
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if (!host_dev)
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return -1;
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if (os_lseek(host_dev->fd,
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start * host_dev->blk_dev.blksz,
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OS_SEEK_SET) == -1) {
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printf("ERROR: Invalid position\n");
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return -1;
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}
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ssize_t len = os_read(host_dev->fd, buffer,
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blkcnt * host_dev->blk_dev.blksz);
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if (len >= 0)
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return len / host_dev->blk_dev.blksz;
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return -1;
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}
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static unsigned long host_block_write(int dev, unsigned long start,
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lbaint_t blkcnt, const void *buffer)
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{
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struct host_block_dev *host_dev = find_host_device(dev);
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if (os_lseek(host_dev->fd,
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start * host_dev->blk_dev.blksz,
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OS_SEEK_SET) == -1) {
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printf("ERROR: Invalid position\n");
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return -1;
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}
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ssize_t len = os_write(host_dev->fd, buffer, blkcnt *
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host_dev->blk_dev.blksz);
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if (len >= 0)
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return len / host_dev->blk_dev.blksz;
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return -1;
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}
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int host_dev_bind(int dev, char *filename)
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{
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struct host_block_dev *host_dev = find_host_device(dev);
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if (!host_dev)
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return -1;
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if (host_dev->blk_dev.priv) {
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os_close(host_dev->fd);
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host_dev->blk_dev.priv = NULL;
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}
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if (host_dev->filename)
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free(host_dev->filename);
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if (filename && *filename) {
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host_dev->filename = strdup(filename);
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} else {
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host_dev->filename = NULL;
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return 0;
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}
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host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
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if (host_dev->fd == -1) {
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printf("Failed to access host backing file '%s'\n",
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host_dev->filename);
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return 1;
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}
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block_dev_desc_t *blk_dev = &host_dev->blk_dev;
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blk_dev->if_type = IF_TYPE_HOST;
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blk_dev->priv = host_dev;
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blk_dev->blksz = 512;
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blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
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blk_dev->block_read = host_block_read;
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blk_dev->block_write = host_block_write;
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blk_dev->dev = dev;
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blk_dev->part_type = PART_TYPE_UNKNOWN;
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init_part(blk_dev);
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return 0;
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}
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int host_get_dev_err(int dev, block_dev_desc_t **blk_devp)
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{
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struct host_block_dev *host_dev = find_host_device(dev);
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if (!host_dev)
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return -ENODEV;
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if (!host_dev->blk_dev.priv)
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return -ENOENT;
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*blk_devp = &host_dev->blk_dev;
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return 0;
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}
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block_dev_desc_t *host_get_dev(int dev)
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{
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block_dev_desc_t *blk_dev;
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if (host_get_dev_err(dev, &blk_dev))
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return NULL;
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return blk_dev;
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}
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