include/ext_common.h

   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