ext4.c 3.8 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. #ifdef CONFIG_MMC
  40. static char *part_str;
  41. if (!part_str) {
  42. part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
  43. if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
  44. part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
  45. part_str[0] += mmc_get_env_dev();
  46. }
  47. }
  48. return part_str;
  49. #else
  50. return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  51. #endif
  52. }
  53. static int env_ext4_save_buffer(env_t *env_new)
  54. {
  55. struct blk_desc *dev_desc = NULL;
  56. struct disk_partition info;
  57. int dev, part;
  58. int err;
  59. const char *ifname = env_ext4_get_intf();
  60. const char *dev_and_part = env_ext4_get_dev_part();
  61. part = blk_get_device_part_str(ifname, dev_and_part,
  62. &dev_desc, &info, 1);
  63. if (part < 0)
  64. return 1;
  65. dev = dev_desc->devnum;
  66. ext4fs_set_blk_dev(dev_desc, &info);
  67. if (!ext4fs_mount(info.size)) {
  68. printf("\n** Unable to use %s %s for saveenv **\n",
  69. ifname, dev_and_part);
  70. return 1;
  71. }
  72. err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
  73. sizeof(env_t), FILETYPE_REG);
  74. ext4fs_close();
  75. if (err == -1) {
  76. printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  77. CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  78. return 1;
  79. }
  80. return 0;
  81. }
  82. static int env_ext4_save(void)
  83. {
  84. env_t env_new;
  85. int err;
  86. err = env_export(&env_new);
  87. if (err)
  88. return err;
  89. err = env_ext4_save_buffer(&env_new);
  90. if (err)
  91. return err;
  92. gd->env_valid = ENV_VALID;
  93. puts("done\n");
  94. return 0;
  95. }
  96. static int env_ext4_erase(void)
  97. {
  98. env_t env_new;
  99. int err;
  100. memset(&env_new, 0, sizeof(env_t));
  101. err = env_ext4_save_buffer(&env_new);
  102. if (err)
  103. return err;
  104. gd->env_valid = ENV_INVALID;
  105. puts("done\n");
  106. return 0;
  107. }
  108. static int env_ext4_load(void)
  109. {
  110. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  111. struct blk_desc *dev_desc = NULL;
  112. struct disk_partition info;
  113. int dev, part;
  114. int err;
  115. loff_t off;
  116. const char *ifname = env_ext4_get_intf();
  117. const char *dev_and_part = env_ext4_get_dev_part();
  118. #ifdef CONFIG_MMC
  119. if (!strcmp(ifname, "mmc"))
  120. mmc_initialize(NULL);
  121. #endif
  122. part = blk_get_device_part_str(ifname, dev_and_part,
  123. &dev_desc, &info, 1);
  124. if (part < 0)
  125. goto err_env_relocate;
  126. dev = dev_desc->devnum;
  127. ext4fs_set_blk_dev(dev_desc, &info);
  128. if (!ext4fs_mount(info.size)) {
  129. printf("\n** Unable to use %s %s for loading the env **\n",
  130. ifname, dev_and_part);
  131. goto err_env_relocate;
  132. }
  133. err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
  134. &off);
  135. ext4fs_close();
  136. if (err == -1) {
  137. printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
  138. CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  139. goto err_env_relocate;
  140. }
  141. err = env_import(buf, 1, H_EXTERNAL);
  142. if (!err)
  143. gd->env_valid = ENV_VALID;
  144. return err;
  145. err_env_relocate:
  146. env_set_default(NULL, 0);
  147. return -EIO;
  148. }
  149. U_BOOT_ENV_LOCATION(ext4) = {
  150. .location = ENVL_EXT4,
  151. ENV_NAME("EXT4")
  152. .load = env_ext4_load,
  153. .save = ENV_SAVE_PTR(env_ext4_save),
  154. .erase = CONFIG_IS_ENABLED(CMD_ERASEENV) ? env_ext4_erase :
  155. NULL,
  156. };