env/ext4.c

   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
  21 #include <common.h>
  22 #include <part.h>
  23
  24 #include <command.h>
  25 #include <env.h>
  26 #include <env_internal.h>
  27 #include <linux/stddef.h>
  28 #include <malloc.h>
  29 #include <memalign.h>
  30 #include <search.h>
  31 #include <errno.h>
  32 #include <ext4fs.h>
  33 #include <mmc.h>
  34
  35 DECLARE_GLOBAL_DATA_PTR;
  36
  37 __weak const char *env_ext4_get_intf(void)
  38 {
  39         return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  40 }
  41
  42 __weak const char *env_ext4_get_dev_part(void)
  43 {
  44 #ifdef CONFIG_MMC
  45         static char *part_str;
  46
  47         if (!part_str) {
  48                 part_str = CONFIG_ENV_EXT4_DEVICE_AND_PART;
  49                 if (!strcmp(CONFIG_ENV_EXT4_INTERFACE, "mmc") && part_str[0] == ':') {
  50                         part_str = "0" CONFIG_ENV_EXT4_DEVICE_AND_PART;
  51                         part_str[0] += mmc_get_env_dev();
  52                 }
  53         }
  54
  55         return part_str;
  56 #else
  57         return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  58 #endif
  59 }
  60
  61 static int env_ext4_save_buffer(env_t *env_new)
  62 {
  63         struct blk_desc *dev_desc = NULL;
  64         struct disk_partition info;
  65         int dev, part;
  66         int err;
  67         const char *ifname = env_ext4_get_intf();
  68         const char *dev_and_part = env_ext4_get_dev_part();
  69
  70         part = blk_get_device_part_str(ifname, dev_and_part,
  71                                        &dev_desc, &info, 1);
  72         if (part < 0)
  73                 return 1;
  74
  75         dev = dev_desc->devnum;
  76         ext4fs_set_blk_dev(dev_desc, &info);
  77
  78         if (!ext4fs_mount(info.size)) {
  79                 printf("\n** Unable to use %s %s for saveenv **\n",
  80                        ifname, dev_and_part);
  81                 return 1;
  82         }
  83
  84         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)env_new,
  85                            sizeof(env_t), FILETYPE_REG);
  86         ext4fs_close();
  87
  88         if (err == -1) {
  89                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  90                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  91                 return 1;
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int env_ext4_save(void)
  98 {
  99         env_t env_new;
 100         int err;
 101
 102         err = env_export(&env_new);
 103         if (err)
 104                 return err;
 105
 106         err = env_ext4_save_buffer(&env_new);
 107         if (err)
 108                 return err;
 109
 110         gd->env_valid = ENV_VALID;
 111         puts("done\n");
 112
 113         return 0;
 114 }
 115
 116 static int env_ext4_erase(void)
 117 {
 118         env_t env_new;
 119         int err;
 120
 121         memset(&env_new, 0, sizeof(env_t));
 122
 123         err = env_ext4_save_buffer(&env_new);
 124         if (err)
 125                 return err;
 126
 127         gd->env_valid = ENV_INVALID;
 128         puts("done\n");
 129
 130         return 0;
 131 }
 132
 133 static int env_ext4_load(void)
 134 {
 135         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
 136         struct blk_desc *dev_desc = NULL;
 137         struct disk_partition info;
 138         int dev, part;
 139         int err;
 140         loff_t off;
 141         const char *ifname = env_ext4_get_intf();
 142         const char *dev_and_part = env_ext4_get_dev_part();
 143
 144 #ifdef CONFIG_MMC
 145         if (!strcmp(ifname, "mmc"))
 146                 mmc_initialize(NULL);
 147 #endif
 148
 149         part = blk_get_device_part_str(ifname, dev_and_part,
 150                                        &dev_desc, &info, 1);
 151         if (part < 0)
 152                 goto err_env_relocate;
 153
 154         dev = dev_desc->devnum;
 155         ext4fs_set_blk_dev(dev_desc, &info);
 156
 157         if (!ext4fs_mount(info.size)) {
 158                 printf("\n** Unable to use %s %s for loading the env **\n",
 159                        ifname, dev_and_part);
 160                 goto err_env_relocate;
 161         }
 162
 163         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 164                              &off);
 165         ext4fs_close();
 166
 167         if (err == -1) {
 168                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 169                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
 170                 goto err_env_relocate;
 171         }
 172
 173         err = env_import(buf, 1, H_EXTERNAL);
 174         if (!err)
 175                 gd->env_valid = ENV_VALID;
 176
 177         return err;
 178
 179 err_env_relocate:
 180         env_set_default(NULL, 0);
 181
 182         return -EIO;
 183 }
 184
 185 U_BOOT_ENV_LOCATION(ext4) = {
 186         .location       = ENVL_EXT4,
 187         ENV_NAME("EXT4")
 188         .load           = env_ext4_load,
 189         .save           = ENV_SAVE_PTR(env_ext4_save),
 190         .erase          = CONFIG_IS_ENABLED(CMD_ERASEENV) ? env_ext4_erase :
 191                                                             NULL,
 192 };