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 #define SECTOR_BITS 9 38 39 /* Magic value used to identify an ext2 filesystem. */ 40 #define EXT2_MAGIC 0xEF53 41 /* Amount of indirect blocks in an inode. */ 42 #define INDIRECT_BLOCKS 12 43 /* Maximum lenght of a pathname. */ 44 #define EXT2_PATH_MAX 4096 45 /* Maximum nesting of symlinks, used to prevent a loop. */ 46 #define EXT2_MAX_SYMLINKCNT 8 47 48 /* Filetype used in directory entry. */ 49 #define FILETYPE_UNKNOWN 0 50 #define FILETYPE_REG 1 51 #define FILETYPE_DIRECTORY 2 52 #define FILETYPE_SYMLINK 7 53 54 /* Filetype information as used in inodes. */ 55 #define FILETYPE_INO_MASK 0170000 56 #define FILETYPE_INO_REG 0100000 57 #define FILETYPE_INO_DIRECTORY 0040000 58 #define FILETYPE_INO_SYMLINK 0120000 59 #define EXT2_ROOT_INO 2 /* Root inode */ 60 61 /* Bits used as offset in sector */ 62 #define DISK_SECTOR_BITS 9 63 /* The size of an ext2 block in bytes. */ 64 #define EXT2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE(data)) 65 66 /* Log2 size of ext2 block in 512 blocks. */ 67 #define LOG2_EXT2_BLOCK_SIZE(data) (__le32_to_cpu \ 68 (data->sblock.log2_block_size) + 1) 69 70 /* Log2 size of ext2 block in bytes. */ 71 #define LOG2_BLOCK_SIZE(data) (__le32_to_cpu \ 72 (data->sblock.log2_block_size) + 10) 73 #define INODE_SIZE_FILESYSTEM(data) (__le32_to_cpu \ 74 (data->sblock.inode_size)) 75 76 #define EXT2_FT_DIR 2 77 #define SUCCESS 1 78 79 /* Macro-instructions used to manage several block sizes */ 80 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 81 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 82 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 83 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 84 85 /* The ext2 superblock. */ 86 struct ext2_sblock { 87 uint32_t total_inodes; 88 uint32_t total_blocks; 89 uint32_t reserved_blocks; 90 uint32_t free_blocks; 91 uint32_t free_inodes; 92 uint32_t first_data_block; 93 uint32_t log2_block_size; 94 uint32_t log2_fragment_size; 95 uint32_t blocks_per_group; 96 uint32_t fragments_per_group; 97 uint32_t inodes_per_group; 98 uint32_t mtime; 99 uint32_t utime; 100 uint16_t mnt_count; 101 uint16_t max_mnt_count; 102 uint16_t magic; 103 uint16_t fs_state; 104 uint16_t error_handling; 105 uint16_t minor_revision_level; 106 uint32_t lastcheck; 107 uint32_t checkinterval; 108 uint32_t creator_os; 109 uint32_t revision_level; 110 uint16_t uid_reserved; 111 uint16_t gid_reserved; 112 uint32_t first_inode; 113 uint16_t inode_size; 114 uint16_t block_group_number; 115 uint32_t feature_compatibility; 116 uint32_t feature_incompat; 117 uint32_t feature_ro_compat; 118 uint32_t unique_id[4]; 119 char volume_name[16]; 120 char last_mounted_on[64]; 121 uint32_t compression_info; 122 }; 123 124 struct ext2_block_group { 125 __u32 block_id; /* Blocks bitmap block */ 126 __u32 inode_id; /* Inodes bitmap block */ 127 __u32 inode_table_id; /* Inodes table block */ 128 __u16 free_blocks; /* Free blocks count */ 129 __u16 free_inodes; /* Free inodes count */ 130 __u16 used_dir_cnt; /* Directories count */ 131 __u16 bg_flags; 132 __u32 bg_reserved[2]; 133 __u16 bg_itable_unused; /* Unused inodes count */ 134 __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/ 135 }; 136 137 /* The ext2 inode. */ 138 struct ext2_inode { 139 uint16_t mode; 140 uint16_t uid; 141 uint32_t size; 142 uint32_t atime; 143 uint32_t ctime; 144 uint32_t mtime; 145 uint32_t dtime; 146 uint16_t gid; 147 uint16_t nlinks; 148 uint32_t blockcnt; /* Blocks of 512 bytes!! */ 149 uint32_t flags; 150 uint32_t osd1; 151 union { 152 struct datablocks { 153 uint32_t dir_blocks[INDIRECT_BLOCKS]; 154 uint32_t indir_block; 155 uint32_t double_indir_block; 156 uint32_t triple_indir_block; 157 } blocks; 158 char symlink[60]; 159 } b; 160 uint32_t version; 161 uint32_t acl; 162 uint32_t dir_acl; 163 uint32_t fragment_addr; 164 uint32_t osd2[3]; 165 }; 166 167 /* The header of an ext2 directory entry. */ 168 struct ext2_dirent { 169 uint32_t inode; 170 uint16_t direntlen; 171 uint8_t namelen; 172 uint8_t filetype; 173 }; 174 175 struct ext2fs_node { 176 struct ext2_data *data; 177 struct ext2_inode inode; 178 int ino; 179 int inode_read; 180 }; 181 182 /* Information about a "mounted" ext2 filesystem. */ 183 struct ext2_data { 184 struct ext2_sblock sblock; 185 struct ext2_inode *inode; 186 struct ext2fs_node diropen; 187 }; 188 189 extern unsigned long part_offset; 190 191 int do_ext2ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); 192 int do_ext2load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); 193 int do_ext4_load(cmd_tbl_t *cmdtp, int flag, int argc, 194 char *const argv[]); 195 int do_ext4_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]); 196 int do_ext4_write(cmd_tbl_t *cmdtp, int flag, int argc, 197 char *const argv[]); 198 #endif 199