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 env_t *env_ptr;
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 #ifdef CONFIG_CMD_SAVEENV
  39 static int env_ext4_save(void)
  40 {
  41         env_t   env_new;
  42         struct blk_desc *dev_desc = NULL;
  43         disk_partition_t info;
  44         int dev, part;
  45         int err;
  46
  47         err = env_export(&env_new);
  48         if (err)
  49                 return err;
  50
  51         part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
  52                                         EXT4_ENV_DEVICE_AND_PART,
  53                                         &dev_desc, &info, 1);
  54         if (part < 0)
  55                 return 1;
  56
  57         dev = dev_desc->devnum;
  58         ext4fs_set_blk_dev(dev_desc, &info);
  59
  60         if (!ext4fs_mount(info.size)) {
  61                 printf("\n** Unable to use %s %s for saveenv **\n",
  62                        EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
  63                 return 1;
  64         }
  65
  66         err = ext4fs_write(EXT4_ENV_FILE, (void *)&env_new, sizeof(env_t));
  67         ext4fs_close();
  68
  69         if (err == -1) {
  70                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  71                         EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
  72                 return 1;
  73         }
  74
  75         puts("done\n");
  76         return 0;
  77 }
  78 #endif /* CONFIG_CMD_SAVEENV */
  79
  80 static void env_ext4_load(void)
  81 {
  82         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  83         struct blk_desc *dev_desc = NULL;
  84         disk_partition_t info;
  85         int dev, part;
  86         int err;
  87         loff_t off;
  88
  89         part = blk_get_device_part_str(EXT4_ENV_INTERFACE,
  90                                         EXT4_ENV_DEVICE_AND_PART,
  91                                         &dev_desc, &info, 1);
  92         if (part < 0)
  93                 goto err_env_relocate;
  94
  95         dev = dev_desc->devnum;
  96         ext4fs_set_blk_dev(dev_desc, &info);
  97
  98         if (!ext4fs_mount(info.size)) {
  99                 printf("\n** Unable to use %s %s for loading the env **\n",
 100                        EXT4_ENV_INTERFACE, EXT4_ENV_DEVICE_AND_PART);
 101                 goto err_env_relocate;
 102         }
 103
 104         err = ext4_read_file(EXT4_ENV_FILE, buf, 0, CONFIG_ENV_SIZE, &off);
 105         ext4fs_close();
 106
 107         if (err == -1) {
 108                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 109                         EXT4_ENV_FILE, EXT4_ENV_INTERFACE, dev, part);
 110                 goto err_env_relocate;
 111         }
 112
 113         env_import(buf, 1);
 114         return;
 115
 116 err_env_relocate:
 117         set_default_env(NULL);
 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 };