env/ext4.c

   1 /*
   2  * (c) Copyright 2016 by VRT Technology
   3  *
   4  * Author:
   5  *  Stuart Longland <stuartl@vrt.com.au>
   6  *
   7  * Based on FAT environment driver
   8  * (c) Copyright 2011 by Tigris Elektronik GmbH
   9  *
  10  * Author:
  11  *  Maximilian Schwerin <mvs@tigris.de>
  12  *
  13  * and EXT4 filesystem implementation
  14  * (C) Copyright 2011 - 2012 Samsung Electronics
  15  * EXT4 filesystem implementation in Uboot by
  16  * Uma Shankar <uma.shankar@samsung.com>
  17  * Manjunatha C Achar <a.manjunatha@samsung.com>
  18  *
  19  * SPDX-License-Identifier:     GPL-2.0+
  20  */
  21
  22 #include <common.h>
  23
  24 #include <command.h>
  25 #include <environment.h>
  26 #include <linux/stddef.h>
  27 #include <malloc.h>
  28 #include <memalign.h>
  29 #include <search.h>
  30 #include <errno.h>
  31 #include <ext4fs.h>
  32 #include <mmc.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 #ifdef CONFIG_CMD_SAVEENV
  37 static int env_ext4_save(void)
  38 {
  39         env_t   env_new;
  40         struct blk_desc *dev_desc = NULL;
  41         disk_partition_t info;
  42         int dev, part;
  43         int err;
  44
  45         err = env_export(&env_new);
  46         if (err)
  47                 return err;
  48
  49         part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
  50                                         EXT4_ENV_DEVICE_AND_PART,
  51                                         &dev_desc, &info, 1);
  52         if (part < 0)
  53                 return 1;
  54
  55         dev = dev_desc->devnum;
  56         ext4fs_set_blk_dev(dev_desc, &info);
  57
  58         if (!ext4fs_mount(info.size)) {
  59                 printf("\n** Unable to use %s %s for saveenv **\n",
  60                        EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
  61                 return 1;
  62         }
  63
  64         err = ext4fs_write(EXT4_ENV_FILE, (void *)&env_new, sizeof(env_t));
  65         ext4fs_close();
  66
  67         if (err == -1) {
  68                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  69                         EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
  70                 return 1;
  71         }
  72
  73         puts("done\n");
  74         return 0;
  75 }
  76 #endif /* CONFIG_CMD_SAVEENV */
  77
  78 static int env_ext4_load(void)
  79 {
  80         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  81         struct blk_desc *dev_desc = NULL;
  82         disk_partition_t info;
  83         int dev, part;
  84         int err;
  85         loff_t off;
  86
  87         part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
  88                                         EXT4_ENV_DEVICE_AND_PART,
  89                                         &dev_desc, &info, 1);
  90         if (part < 0)
  91                 goto err_env_relocate;
  92
  93         dev = dev_desc->devnum;
  94         ext4fs_set_blk_dev(dev_desc, &info);
  95
  96         if (!ext4fs_mount(info.size)) {
  97                 printf("\n** Unable to use %s %s for loading the env **\n",
  98                        EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
  99                 goto err_env_relocate;
 100         }
 101
 102         err = ext4_read_file(EXT4_ENV_FILE, buf, 0, CONFIG_ENV_SIZE, &off);
 103         ext4fs_close();
 104
 105         if (err == -1) {
 106                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 107                         EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
 108                 goto err_env_relocate;
 109         }
 110
 111         env_import(buf, 1);
 112         return 0;
 113
 114 err_env_relocate:
 115         set_default_env(NULL);
 116
 117         return -EIO;
 118 }
 119
 120 U_BOOT_ENV_LOCATION(ext4) = {
 121         .location       = ENVL_EXT4,
 122         ENV_NAME("EXT4")
 123         .load           = env_ext4_load,
 124         .save           = env_save_ptr(env_ext4_save),
 125 };