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 <env.h>
  25 #include <env_internal.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 __weak const char *env_ext4_get_intf(void)
  35 {
  36         return (const char *)CONFIG_ENV_EXT4_INTERFACE;
  37 }
  38
  39 __weak const char *env_ext4_get_dev_part(void)
  40 {
  41         return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
  42 }
  43
  44 #ifdef CONFIG_CMD_SAVEENV
  45 static int env_ext4_save(void)
  46 {
  47         env_t   env_new;
  48         struct blk_desc *dev_desc = NULL;
  49         disk_partition_t info;
  50         int dev, part;
  51         int err;
  52         const char *ifname = env_ext4_get_intf();
  53         const char *dev_and_part = env_ext4_get_dev_part();
  54
  55         err = env_export(&env_new);
  56         if (err)
  57                 return err;
  58
  59         part = blk_get_device_part_str(ifname, dev_and_part,
  60                                        &dev_desc, &info, 1);
  61         if (part < 0)
  62                 return 1;
  63
  64         dev = dev_desc->devnum;
  65         ext4fs_set_blk_dev(dev_desc, &info);
  66
  67         if (!ext4fs_mount(info.size)) {
  68                 printf("\n** Unable to use %s %s for saveenv **\n",
  69                        ifname, dev_and_part);
  70                 return 1;
  71         }
  72
  73         err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
  74                            sizeof(env_t), FILETYPE_REG);
  75         ext4fs_close();
  76
  77         if (err == -1) {
  78                 printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
  79                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
  80                 return 1;
  81         }
  82
  83         puts("done\n");
  84         return 0;
  85 }
  86 #endif /* CONFIG_CMD_SAVEENV */
  87
  88 static int env_ext4_load(void)
  89 {
  90         ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
  91         struct blk_desc *dev_desc = NULL;
  92         disk_partition_t info;
  93         int dev, part;
  94         int err;
  95         loff_t off;
  96         const char *ifname = env_ext4_get_intf();
  97         const char *dev_and_part = env_ext4_get_dev_part();
  98
  99 #ifdef CONFIG_MMC
 100         if (!strcmp(ifname, "mmc"))
 101                 mmc_initialize(NULL);
 102 #endif
 103
 104         part = blk_get_device_part_str(ifname, dev_and_part,
 105                                        &dev_desc, &info, 1);
 106         if (part < 0)
 107                 goto err_env_relocate;
 108
 109         dev = dev_desc->devnum;
 110         ext4fs_set_blk_dev(dev_desc, &info);
 111
 112         if (!ext4fs_mount(info.size)) {
 113                 printf("\n** Unable to use %s %s for loading the env **\n",
 114                        ifname, dev_and_part);
 115                 goto err_env_relocate;
 116         }
 117
 118         err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
 119                              &off);
 120         ext4fs_close();
 121
 122         if (err == -1) {
 123                 printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
 124                         CONFIG_ENV_EXT4_FILE, ifname, dev, part);
 125                 goto err_env_relocate;
 126         }
 127
 128         return env_import(buf, 1);
 129
 130 err_env_relocate:
 131         env_set_default(NULL, 0);
 132
 133         return -EIO;
 134 }
 135
 136 U_BOOT_ENV_LOCATION(ext4) = {
 137         .location       = ENVL_EXT4,
 138         ENV_NAME("EXT4")
 139         .load           = env_ext4_load,
 140         .save           = env_save_ptr(env_ext4_save),
 141 };