sandbox.c 2.9 KB

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