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
  23 #include <command.h>
  24 #include <environment.h>
  25 #include <linux/stddef.h>
  26 #include <malloc.h>
  27 #include <memalign.h>
  28 #include <search.h>
  29 #include <errno.h>
  30 #include <ext4fs.h>
  31 #include <mmc.h>
  32
  33 __weak const char *env_ext4_get_intf(void)
  34 {
  35         return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  36 }
  37
  38 __weak const char *env_ext4_get_dev_part(void)
  39 {
  40         return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  41 }
  42
  43 #ifdef CONFIG_CMD_SAVEENV
  44 static int env_ext4_save(void)
  45 {
  46         env_t   env_new;
  47         struct blk_desc *dev_desc = NULL;
  48         disk_partition_t info;
  49         int dev, part;
  50         int err;
  51         const char *ifname = env_ext4_get_intf();
  52         const char *dev_and_part = env_ext4_get_dev_part();
  53
  54         err = env_export(&env_new);
  55         if (err)
  56                 return err;
  57
  58         part = blk_get_device_part_str(ifname, dev_and_part,
  59                                        &dev_desc, &info, 1);
  60         if (part < 0)
  61                 return 1;
  62
  63         dev = dev_desc->devnum;
  64         ext4fs_set_blk_dev(dev_desc, &info);
  65
  66         if (!ext4fs_mount(info.size)) {
  67                 printf("\n** Unable to use %s %s for saveenv **\n",
  68                        ifname, dev_and_part);
  69                 return 1;
  70         }
  71
  72         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
  73                            sizeof(env_t), FILETYPE_REG);
  74         ext4fs_close();
  75
  76         if (err == -1) {
  77                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  78                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  79                 return 1;
  80         }
  81
  82         puts("done\n");
  83         return 0;
  84 }
  85 #endif /* CONFIG_CMD_SAVEENV */
  86
  87 static int env_ext4_load(void)
  88 {
  89         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  90         struct blk_desc *dev_desc = NULL;
  91         disk_partition_t info;
  92         int dev, part;
  93         int err;
  94         loff_t off;
  95         const char *ifname = env_ext4_get_intf();
  96         const char *dev_and_part = env_ext4_get_dev_part();
  97
  98 #ifdef CONFIG_MMC
  99         if (!strcmp(ifname, "mmc"))
 100                 mmc_initialize(NULL);
 101 #endif
 102
 103         part = blk_get_device_part_str(ifname, dev_and_part,
 104                                        &dev_desc, &info, 1);
 105         if (part < 0)
 106                 goto err_env_relocate;
 107
 108         dev = dev_desc->devnum;
 109         ext4fs_set_blk_dev(dev_desc, &info);
 110
 111         if (!ext4fs_mount(info.size)) {
 112                 printf("\n** Unable to use %s %s for loading the env **\n",
 113                        ifname, dev_and_part);
 114                 goto err_env_relocate;
 115         }
 116
 117         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 118                              &off);
 119         ext4fs_close();
 120
 121         if (err == -1) {
 122                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 123                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
 124                 goto err_env_relocate;
 125         }
 126
 127         return env_import(buf, 1);
 128
 129 err_env_relocate:
 130         set_default_env(NULL, 0);
 131
 132         return -EIO;
 133 }
 134
 135 U_BOOT_ENV_LOCATION(ext4) = {
 136         .location       = ENVL_EXT4,
 137         ENV_NAME("EXT4")
 138         .load           = env_ext4_load,
 139         .save           = env_save_ptr(env_ext4_save),
 140 };