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