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>master
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/*
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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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} |
@ -0,0 +1,18 @@ |
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/*
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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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#ifndef __SANDBOX_BLOCK_DEV__ |
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#define __SANDBOX_BLOCK_DEV__ |
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struct host_block_dev { |
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block_dev_desc_t blk_dev; |
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char *filename; |
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int fd; |
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}; |
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int host_dev_bind(int dev, char *filename); |
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#endif |
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