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. #include <asm/global_data.h>
  33. DECLARE_GLOBAL_DATA_PTR;
  34. __weak const char *env_ext4_get_intf(void)
  35. {
  36. return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  37. }
  38. __weak const char *env_ext4_get_dev_part(void)
  39. {
  40. #ifdef CONFIG_MMC
  41. static char *part_str;
  42. if (!part_str) {
  43. part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
  44. if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
  45. part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
  46. part_str[0] += mmc_get_env_dev();
  47. }
  48. }
  49. return part_str;
  50. #else
  51. return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  52. #endif
  53. }
  54. static int env_ext4_save_buffer(env_t *env_new)
  55. {
  56. struct blk_desc *dev_desc = NULL;
  57. struct disk_partition info;
  58. int dev, part;
  59. int err;
  60. const char *ifname = env_ext4_get_intf();
  61. const char *dev_and_part = env_ext4_get_dev_part();
  62. part = blk_get_device_part_str(ifname, dev_and_part,
  63. &dev_desc, &info, 1);
  64. if (part < 0)
  65. return 1;
  66. dev = dev_desc->devnum;
  67. ext4fs_set_blk_dev(dev_desc, &info);
  68. if (!ext4fs_mount(info.size)) {
  69. printf("\n** Unable to use %s %s for saveenv **\n",
  70. ifname, dev_and_part);
  71. return 1;
  72. }
  73. err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
  74. sizeof(env_t), FILETYPE_REG);
  75. ext4fs_close();
  76. if (err == -1) {
  77. printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  78. CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  79. return 1;
  80. }
  81. return 0;
  82. }
  83. static int env_ext4_save(void)
  84. {
  85. env_t env_new;
  86. int err;
  87. err = env_export(&env_new);
  88. if (err)
  89. return err;
  90. err = env_ext4_save_buffer(&env_new);
  91. if (err)
  92. return err;
  93. gd->env_valid = ENV_VALID;
  94. puts("done\n");
  95. return 0;
  96. }
  97. static int env_ext4_erase(void)
  98. {
  99. env_t env_new;
  100. int err;
  101. memset(&env_new, 0, sizeof(env_t));
  102. err = env_ext4_save_buffer(&env_new);
  103. if (err)
  104. return err;
  105. gd->env_valid = ENV_INVALID;
  106. puts("done\n");
  107. return 0;
  108. }
  109. static int env_ext4_load(void)
  110. {
  111. ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  112. struct blk_desc *dev_desc = NULL;
  113. struct disk_partition info;
  114. int dev, part;
  115. int err;
  116. loff_t off;
  117. const char *ifname = env_ext4_get_intf();
  118. const char *dev_and_part = env_ext4_get_dev_part();
  119. #ifdef CONFIG_MMC
  120. if (!strcmp(ifname, "mmc"))
  121. mmc_initialize(NULL);
  122. #endif
  123. part = blk_get_device_part_str(ifname, dev_and_part,
  124. &dev_desc, &info, 1);
  125. if (part < 0)
  126. goto err_env_relocate;
  127. dev = dev_desc->devnum;
  128. ext4fs_set_blk_dev(dev_desc, &info);
  129. if (!ext4fs_mount(info.size)) {
  130. printf("\n** Unable to use %s %s for loading the env **\n",
  131. ifname, dev_and_part);
  132. goto err_env_relocate;
  133. }
  134. err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
  135. &off);
  136. ext4fs_close();
  137. if (err == -1) {
  138. printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
  139. CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  140. goto err_env_relocate;
  141. }
  142. err = env_import(buf, 1, H_EXTERNAL);
  143. if (!err)
  144. gd->env_valid = ENV_VALID;
  145. return err;
  146. err_env_relocate:
  147. env_set_default(NULL, 0);
  148. return -EIO;
  149. }
  150. U_BOOT_ENV_LOCATION(ext4) = {
  151. .location = ENVL_EXT4,
  152. ENV_NAME("EXT4")
  153. .load = env_ext4_load,
  154. .save = ENV_SAVE_PTR(env_ext4_save),
  155. .erase = ENV_ERASE_PTR(env_ext4_erase),
  156. };