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(CONFIG_ENV_EXT4_INTERFACE,
  50                                        CONFIG_ENV_EXT4_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                        CONFIG_ENV_EXT4_INTERFACE,
  61                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
  62                 return 1;
  63         }
  64
  65         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
  66                            sizeof(env_t));
  67         ext4fs_close();
  68
  69         if (err == -1) {
  70                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  71                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
  72                         part);
  73                 return 1;
  74         }
  75
  76         puts("done\n");
  77         return 0;
  78 }
  79 #endif /* CONFIG_CMD_SAVEENV */
  80
  81 static int env_ext4_load(void)
  82 {
  83         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  84         struct blk_desc *dev_desc = NULL;
  85         disk_partition_t info;
  86         int dev, part;
  87         int err;
  88         loff_t off;
  89
  90         part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
  91                                        CONFIG_ENV_EXT4_DEVICE_AND_PART,
  92                                        &dev_desc, &info, 1);
  93         if (part < 0)
  94                 goto err_env_relocate;
  95
  96         dev = dev_desc->devnum;
  97         ext4fs_set_blk_dev(dev_desc, &info);
  98
  99         if (!ext4fs_mount(info.size)) {
 100                 printf("\n** Unable to use %s %s for loading the env **\n",
 101                        CONFIG_ENV_EXT4_INTERFACE,
 102                        CONFIG_ENV_EXT4_DEVICE_AND_PART);
 103                 goto err_env_relocate;
 104         }
 105
 106         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 107                              &off);
 108         ext4fs_close();
 109
 110         if (err == -1) {
 111                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 112                         CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
 113                         part);
 114                 goto err_env_relocate;
 115         }
 116
 117         return env_import(buf, 1);
 118
 119 err_env_relocate:
 120         set_default_env(NULL);
 121
 122         return -EIO;
 123 }
 124
 125 U_BOOT_ENV_LOCATION(ext4) = {
 126         .location       = ENVL_EXT4,
 127         ENV_NAME("EXT4")
 128         .load           = env_ext4_load,
 129         .save           = env_save_ptr(env_ext4_save),
 130 };