drivers/block/sandbox.c

   1 /*
   2  * Copyright (C) 2013 Henrik Nordstrom <henrik@henriknordstrom.net>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <config.h>
   8 #include <common.h>
   9 #include <part.h>
  10 #include <os.h>
  11 #include <malloc.h>
  12 #include <sandboxblockdev.h>
  13 #include <asm/errno.h>
  14
  15 static struct host_block_dev host_devices[CONFIG_HOST_MAX_DEVICES];
  16
  17 static struct host_block_dev *find_host_device(int dev)
  18 {
  19         if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
  20                 return &host_devices[dev];
  21
  22         return NULL;
  23 }
  24
  25 static unsigned long host_block_read(int dev, unsigned long start,
  26                                      lbaint_t blkcnt, void *buffer)
  27 {
  28         struct host_block_dev *host_dev = find_host_device(dev);
  29
  30         if (!host_dev)
  31                 return -1;
  32         if (os_lseek(host_dev->fd,
  33                      start * host_dev->blk_dev.blksz,
  34                      OS_SEEK_SET) == -1) {
  35                 printf("ERROR: Invalid position\n");
  36                 return -1;
  37         }
  38         ssize_t len = os_read(host_dev->fd, buffer,
  39                               blkcnt * host_dev->blk_dev.blksz);
  40         if (len >= 0)
  41                 return len / host_dev->blk_dev.blksz;
  42         return -1;
  43 }
  44
  45 static unsigned long host_block_write(int dev, unsigned long start,
  46                                       lbaint_t blkcnt, const void *buffer)
  47 {
  48         struct host_block_dev *host_dev = find_host_device(dev);
  49         if (os_lseek(host_dev->fd,
  50                      start * host_dev->blk_dev.blksz,
  51                      OS_SEEK_SET) == -1) {
  52                 printf("ERROR: Invalid position\n");
  53                 return -1;
  54         }
  55         ssize_t len = os_write(host_dev->fd, buffer, blkcnt *
  56                                host_dev->blk_dev.blksz);
  57         if (len >= 0)
  58                 return len / host_dev->blk_dev.blksz;
  59         return -1;
  60 }
  61
  62 int host_dev_bind(int dev, char *filename)
  63 {
  64         struct host_block_dev *host_dev = find_host_device(dev);
  65
  66         if (!host_dev)
  67                 return -1;
  68         if (host_dev->blk_dev.priv) {
  69                 os_close(host_dev->fd);
  70                 host_dev->blk_dev.priv = NULL;
  71         }
  72         if (host_dev->filename)
  73                 free(host_dev->filename);
  74         if (filename && *filename) {
  75                 host_dev->filename = strdup(filename);
  76         } else {
  77                 host_dev->filename = NULL;
  78                 return 0;
  79         }
  80
  81         host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
  82         if (host_dev->fd == -1) {
  83                 printf("Failed to access host backing file '%s'\n",
  84                        host_dev->filename);
  85                 return 1;
  86         }
  87
  88         block_dev_desc_t *blk_dev = &host_dev->blk_dev;
  89         blk_dev->if_type = IF_TYPE_HOST;
  90         blk_dev->priv = host_dev;
  91         blk_dev->blksz = 512;
  92         blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
  93         blk_dev->block_read = host_block_read;
  94         blk_dev->block_write = host_block_write;
  95         blk_dev->dev = dev;
  96         blk_dev->part_type = PART_TYPE_UNKNOWN;
  97         init_part(blk_dev);
  98
  99         return 0;
 100 }
 101
 102 int host_get_dev_err(int dev, block_dev_desc_t **blk_devp)
 103 {
 104         struct host_block_dev *host_dev = find_host_device(dev);
 105
 106         if (!host_dev)
 107                 return -ENODEV;
 108
 109         if (!host_dev->blk_dev.priv)
 110                 return -ENOENT;
 111
 112         *blk_devp = &host_dev->blk_dev;
 113         return 0;
 114 }
 115
 116 block_dev_desc_t *host_get_dev(int dev)
 117 {
 118         block_dev_desc_t *blk_dev;
 119
 120         if (host_get_dev_err(dev, &blk_dev))
 121                 return NULL;
 122
 123         return blk_dev;
 124 }