ext4.c 3.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (c) Copyright 2016 by VRT Technology
  4. *
  5. * Author:
  6. * Stuart Longland <stuartl@vrt.com.au>
  7. *
  8. * Based on FAT environment driver
  9. * (c) Copyright 2011 by Tigris Elektronik GmbH
  10. *
  11. * Author:
  12. * Maximilian Schwerin <mvs@tigris.de>
  13. *
  14. * and EXT4 filesystem implementation
  15. * (C) Copyright 2011 - 2012 Samsung Electronics
  16. * EXT4 filesystem implementation in Uboot by
  17. * Uma Shankar <uma.shankar@samsung.com>
  18. * Manjunatha C Achar <a.manjunatha@samsung.com>
  19. */
  20. #include <common.h>
  21. #include <part.h>
  22. #include <command.h>
  23. #include <env.h>
  24. #include <env_internal.h>
  25. #include <linux/stddef.h>
  26. #include <malloc.h>
  27. #include <memalign.h>
  28. #include <search.h>
  29. #include <errno.h>
  30. #include <ext4fs.h>
  31. #include <mmc.h>
  32. DECLARE_GLOBAL_DATA_PTR;
  33. __weak const char *env_ext4_get_intf(void)
  34. {
  35. return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  36. }
  37. __weak const char *env_ext4_get_dev_part(void)
  38. {
  39. return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  40. }
  41. static int env_ext4_save_buffer(env_t *env_new)
  42. {
  43. struct blk_desc *dev_desc = NULL;
  44. struct disk_partition info;
  45. int dev, part;
  46. int err;
  47. const char *ifname = env_ext4_get_intf();
  48. const char *dev_and_part = env_ext4_get_dev_part();
  49. part = blk_get_device_part_str(ifname, dev_and_part,
  50. &dev_desc, &info, 1);
  51. if (part < 0)
  52. return 1;
  53. dev = dev_desc->devnum;
  54. ext4fs_set_blk_dev(dev_desc, &info);
  55. if (!ext4fs_mount(info.size)) {
  56. printf("\n** Unable to use %s %s for saveenv **\n",
  57. ifname, dev_and_part);
  58. return 1;
  59. }
  60. err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
  61. sizeof(env_t), FILETYPE_REG);
  62. ext4fs_close();
  63. if (err == -1) {
  64. printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  65. CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  66. return 1;
  67. }
  68. return 0;
  69. }
  70. static int env_ext4_save(void)
  71. {
  72. env_t env_new;
  73. int err;
  74. err = env_export(&env_new);
  75. if (err)
  76. return err;
  77. err = env_ext4_save_buffer(&env_new);
  78. if (err)
  79. return err;
  80. gd->env_valid = ENV_VALID;
  81. puts("done\n");
  82. return 0;
  83. }
  84. static int env_ext4_erase(void)
  85. {
  86. env_t env_new;
  87. int err;
  88. memset(&env_new, 0, sizeof(env_t));
  89. err = env_ext4_save_buffer(&env_new);
  90. if (err)
  91. return err;
  92. gd->env_valid = ENV_INVALID;
  93. puts("done\n");
  94. return 0;
  95. }
  96. static int env_ext4_load(void)
  97. {
  98. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  99. struct blk_desc *dev_desc = NULL;
  100. struct disk_partition info;
  101. int dev, part;
  102. int err;
  103. loff_t off;
  104. const char *ifname = env_ext4_get_intf();
  105. const char *dev_and_part = env_ext4_get_dev_part();
  106. #ifdef CONFIG_MMC
  107. if (!strcmp(ifname, "mmc"))
  108. mmc_initialize(NULL);
  109. #endif
  110. part = blk_get_device_part_str(ifname, dev_and_part,
  111. &dev_desc, &info, 1);
  112. if (part < 0)
  113. goto err_env_relocate;
  114. dev = dev_desc->devnum;
  115. ext4fs_set_blk_dev(dev_desc, &info);
  116. if (!ext4fs_mount(info.size)) {
  117. printf("\n** Unable to use %s %s for loading the env **\n",
  118. ifname, dev_and_part);
  119. goto err_env_relocate;
  120. }
  121. err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
  122. &off);
  123. ext4fs_close();
  124. if (err == -1) {
  125. printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
  126. CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  127. goto err_env_relocate;
  128. }
  129. err = env_import(buf, 1, H_EXTERNAL);
  130. if (!err)
  131. gd->env_valid = ENV_VALID;
  132. return err;
  133. err_env_relocate:
  134. env_set_default(NULL, 0);
  135. return -EIO;
  136. }
  137. U_BOOT_ENV_LOCATION(ext4) = {
  138. .location = ENVL_EXT4,
  139. ENV_NAME("EXT4")
  140. .load = env_ext4_load,
  141. .save = ENV_SAVE_PTR(env_ext4_save),
  142. .erase = CONFIG_IS_ENABLED(CMD_ERASEENV) ? env_ext4_erase :
  143. NULL,
  144. };