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 * Ext4 Extent data structures are taken from original ext4 fs code 8 * as found in the linux kernel. 9 * 10 * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com 11 * Written by Alex Tomas <alex@clusterfs.com> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 */ 26 27#ifndef __EXT4__ 28#define __EXT4__ 29#include <ext_common.h> 30 31struct disk_partition; 32 33#define EXT4_INDEX_FL 0x00001000 /* Inode uses hash tree index */ 34#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 35#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 36#define EXT4_EXT_MAGIC 0xf30a 37#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 38#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 39#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 40#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 41#define EXT4_INDIRECT_BLOCKS 12 42 43#define EXT4_BG_INODE_UNINIT 0x0001 44#define EXT4_BG_BLOCK_UNINIT 0x0002 45#define EXT4_BG_INODE_ZEROED 0x0004 46 47/* 48 * ext4_inode has i_block array (60 bytes total). 49 * The first 12 bytes store ext4_extent_header; 50 * the remainder stores an array of ext4_extent. 51 */ 52 53/* 54 * This is the extent on-disk structure. 55 * It's used at the bottom of the tree. 56 */ 57struct ext4_extent { 58 __le32 ee_block; /* first logical block extent covers */ 59 __le16 ee_len; /* number of blocks covered by extent */ 60 __le16 ee_start_hi; /* high 16 bits of physical block */ 61 __le32 ee_start_lo; /* low 32 bits of physical block */ 62}; 63 64/* 65 * This is index on-disk structure. 66 * It's used at all the levels except the bottom. 67 */ 68struct ext4_extent_idx { 69 __le32 ei_block; /* index covers logical blocks from 'block' */ 70 __le32 ei_leaf_lo; /* pointer to the physical block of the next * 71 * level. leaf or next index could be there */ 72 __le16 ei_leaf_hi; /* high 16 bits of physical block */ 73 __u16 ei_unused; 74}; 75 76/* Each block (leaves and indexes), even inode-stored has header. */ 77struct ext4_extent_header { 78 __le16 eh_magic; /* probably will support different formats */ 79 __le16 eh_entries; /* number of valid entries */ 80 __le16 eh_max; /* capacity of store in entries */ 81 __le16 eh_depth; /* has tree real underlying blocks? */ 82 __le32 eh_generation; /* generation of the tree */ 83}; 84 85struct ext_filesystem { 86 /* Total Sector of partition */ 87 uint64_t total_sect; 88 /* Block size of partition */ 89 uint32_t blksz; 90 /* Inode size of partition */ 91 uint32_t inodesz; 92 /* Sectors per Block */ 93 uint32_t sect_perblk; 94 /* Group Descriptor size */ 95 uint16_t gdsize; 96 /* Group Descriptor Block Number */ 97 uint32_t gdtable_blkno; 98 /* Total block groups of partition */ 99 uint32_t no_blkgrp; 100 /* No of blocks required for bgdtable */ 101 uint32_t no_blk_pergdt; 102 /* Superblock */ 103 struct ext2_sblock *sb; 104 /* Block group descritpor table */ 105 char *gdtable; 106 107 /* Block Bitmap Related */ 108 unsigned char **blk_bmaps; 109 long int curr_blkno; 110 uint16_t first_pass_bbmap; 111 112 /* Inode Bitmap Related */ 113 unsigned char **inode_bmaps; 114 int curr_inode_no; 115 uint16_t first_pass_ibmap; 116 117 /* Journal Related */ 118 119 /* Block Device Descriptor */ 120 struct blk_desc *dev_desc; 121}; 122 123struct ext_block_cache { 124 char *buf; 125 lbaint_t block; 126 int size; 127}; 128 129extern struct ext2_data *ext4fs_root; 130extern struct ext2fs_node *ext4fs_file; 131 132#if defined(CONFIG_EXT4_WRITE) 133extern struct ext2_inode *g_parent_inode; 134extern int gd_index; 135extern int gindex; 136 137int ext4fs_init(void); 138void ext4fs_deinit(void); 139int ext4fs_filename_unlink(char *filename); 140int ext4fs_write(const char *fname, const char *buffer, 141 unsigned long sizebytes, int type); 142int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len, 143 loff_t *actwrite); 144int ext4fs_create_link(const char *target, const char *fname); 145#endif 146 147struct ext_filesystem *get_fs(void); 148int ext4fs_open(const char *filename, loff_t *len); 149int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread); 150int ext4fs_mount(void); 151void ext4fs_close(void); 152void ext4fs_reinit_global(void); 153int ext4fs_ls(const char *dirname); 154int ext4fs_exists(const char *filename); 155int ext4fs_size(const char *filename, loff_t *size); 156void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); 157int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf); 158void ext4fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info); 159long int read_allocated_block(struct ext2_inode *inode, int fileblock, 160 struct ext_block_cache *cache); 161int ext4fs_probe(struct blk_desc *fs_dev_desc, 162 struct disk_partition *fs_partition); 163int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len, 164 loff_t *actread); 165int ext4_read_superblock(char *buffer); 166int ext4fs_uuid(char *uuid_str); 167void ext_cache_init(struct ext_block_cache *cache); 168void ext_cache_fini(struct ext_block_cache *cache); 169int ext_cache_read(struct ext_block_cache *cache, lbaint_t block, int size); 170#endif 171