1 /* 2 * (C) Copyright 2011 - 2012 Samsung Electronics 3 * EXT4 filesystem implementation in Uboot by 4 * Uma Shankar <uma.shankar@samsung.com> 5 * Manjunatha C Achar <a.manjunatha@samsung.com> 6 * 7 * Data structures and headers for ext4 support have been taken from 8 * ext2 ls load support in Uboot 9 * 10 * (C) Copyright 2004 11 * esd gmbh <www.esd-electronics.com> 12 * Reinhard Arlt <reinhard.arlt@esd-electronics.com> 13 * 14 * based on code from grub2 fs/ext2.c and fs/fshelp.c by 15 * GRUB -- GRand Unified Bootloader 16 * Copyright (C) 2003, 2004 Free Software Foundation, Inc. 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation; either version 2 of the License, or 21 * (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 26 * GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, write to the Free Software 30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 31 */ 32 33 #ifndef __EXT_COMMON__ 34 #define __EXT_COMMON__ 35 #include <command.h> 36 #define SECTOR_SIZE 0x200 37 38 /* Magic value used to identify an ext2 filesystem. */ 39 #define EXT2_MAGIC 0xEF53 40 /* Amount of indirect blocks in an inode. */ 41 #define INDIRECT_BLOCKS 12 42 /* Maximum lenght of a pathname. */ 43 #define EXT2_PATH_MAX 4096 44 /* Maximum nesting of symlinks, used to prevent a loop. */ 45 #define EXT2_MAX_SYMLINKCNT 8 46 47 /* Filetype used in directory entry. */ 48 #define FILETYPE_UNKNOWN 0 49 #define FILETYPE_REG 1 50 #define FILETYPE_DIRECTORY 2 51 #define FILETYPE_SYMLINK 7 52 53 /* Filetype information as used in inodes. */ 54 #define FILETYPE_INO_MASK 0170000 55 #define FILETYPE_INO_REG 0100000 56 #define FILETYPE_INO_DIRECTORY 0040000 57 #define FILETYPE_INO_SYMLINK 0120000 58 #define EXT2_ROOT_INO 2 /* Root inode */ 59 60 /* The size of an ext2 block in bytes. */ 61 #define EXT2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE(data)) 62 63 /* Log2 size of ext2 block in bytes. */ 64 #define LOG2_BLOCK_SIZE(data) (__le32_to_cpu \ 65 (data->sblock.log2_block_size) \ 66 + EXT2_MIN_BLOCK_LOG_SIZE) 67 #define INODE_SIZE_FILESYSTEM(data) (__le32_to_cpu \ 68 (data->sblock.inode_size)) 69 70 #define EXT2_FT_DIR 2 71 #define SUCCESS 1 72 73 /* Macro-instructions used to manage several block sizes */ 74 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 75 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 76 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 77 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 78 79 /* The ext2 superblock. */ 80 struct ext2_sblock { 81 uint32_t total_inodes; 82 uint32_t total_blocks; 83 uint32_t reserved_blocks; 84 uint32_t free_blocks; 85 uint32_t free_inodes; 86 uint32_t first_data_block; 87 uint32_t log2_block_size; 88 uint32_t log2_fragment_size; 89 uint32_t blocks_per_group; 90 uint32_t fragments_per_group; 91 uint32_t inodes_per_group; 92 uint32_t mtime; 93 uint32_t utime; 94 uint16_t mnt_count; 95 uint16_t max_mnt_count; 96 uint16_t magic; 97 uint16_t fs_state; 98 uint16_t error_handling; 99 uint16_t minor_revision_level; 100 uint32_t lastcheck; 101 uint32_t checkinterval; 102 uint32_t creator_os; 103 uint32_t revision_level; 104 uint16_t uid_reserved; 105 uint16_t gid_reserved; 106 uint32_t first_inode; 107 uint16_t inode_size; 108 uint16_t block_group_number; 109 uint32_t feature_compatibility; 110 uint32_t feature_incompat; 111 uint32_t feature_ro_compat; 112 uint32_t unique_id[4]; 113 char volume_name[16]; 114 char last_mounted_on[64]; 115 uint32_t compression_info; 116 }; 117 118 struct ext2_block_group { 119 __u32 block_id; /* Blocks bitmap block */ 120 __u32 inode_id; /* Inodes bitmap block */ 121 __u32 inode_table_id; /* Inodes table block */ 122 __u16 free_blocks; /* Free blocks count */ 123 __u16 free_inodes; /* Free inodes count */ 124 __u16 used_dir_cnt; /* Directories count */ 125 __u16 bg_flags; 126 __u32 bg_reserved[2]; 127 __u16 bg_itable_unused; /* Unused inodes count */ 128 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 129 }; 130 131 /* The ext2 inode. */ 132 struct ext2_inode { 133 uint16_t mode; 134 uint16_t uid; 135 uint32_t size; 136 uint32_t atime; 137 uint32_t ctime; 138 uint32_t mtime; 139 uint32_t dtime; 140 uint16_t gid; 141 uint16_t nlinks; 142 uint32_t blockcnt; /* Blocks of 512 bytes!! */ 143 uint32_t flags; 144 uint32_t osd1; 145 union { 146 struct datablocks { 147 uint32_t dir_blocks[INDIRECT_BLOCKS]; 148 uint32_t indir_block; 149 uint32_t double_indir_block; 150 uint32_t triple_indir_block; 151 } blocks; 152 char symlink[60]; 153 } b; 154 uint32_t version; 155 uint32_t acl; 156 uint32_t dir_acl; 157 uint32_t fragment_addr; 158 uint32_t osd2[3]; 159 }; 160 161 /* The header of an ext2 directory entry. */ 162 struct ext2_dirent { 163 uint32_t inode; 164 uint16_t direntlen; 165 uint8_t namelen; 166 uint8_t filetype; 167 }; 168 169 struct ext2fs_node { 170 struct ext2_data *data; 171 struct ext2_inode inode; 172 int ino; 173 int inode_read; 174 }; 175 176 /* Information about a "mounted" ext2 filesystem. */ 177 struct ext2_data { 178 struct ext2_sblock sblock; 179 struct ext2_inode *inode; 180 struct ext2fs_node diropen; 181 }; 182 183 extern unsigned long part_offset; 184 185 int do_ext2ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); 186 int do_ext2load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); 187 int do_ext4_load(cmd_tbl_t *cmdtp, int flag, int argc, 188 char *const argv[]); 189 int do_ext4_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]); 190 int do_ext4_write(cmd_tbl_t *cmdtp, int flag, int argc, 191 char *const argv[]); 192 #endif 193