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 31 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 32 #define EXT4_EXT_MAGIC 0xf30a 33 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 34 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 35 #define EXT4_INDIRECT_BLOCKS 12 36 37 #define EXT4_BG_INODE_UNINIT 0x0001 38 #define EXT4_BG_BLOCK_UNINIT 0x0002 39 #define EXT4_BG_INODE_ZEROED 0x0004 40 41 /* 42 * ext4_inode has i_block array (60 bytes total). 43 * The first 12 bytes store ext4_extent_header; 44 * the remainder stores an array of ext4_extent. 45 */ 46 47 /* 48 * This is the extent on-disk structure. 49 * It's used at the bottom of the tree. 50 */ 51 struct ext4_extent { 52 __le32 ee_block; /* first logical block extent covers */ 53 __le16 ee_len; /* number of blocks covered by extent */ 54 __le16 ee_start_hi; /* high 16 bits of physical block */ 55 __le32 ee_start_lo; /* low 32 bits of physical block */ 56 }; 57 58 /* 59 * This is index on-disk structure. 60 * It's used at all the levels except the bottom. 61 */ 62 struct ext4_extent_idx { 63 __le32 ei_block; /* index covers logical blocks from 'block' */ 64 __le32 ei_leaf_lo; /* pointer to the physical block of the next * 65 * level. leaf or next index could be there */ 66 __le16 ei_leaf_hi; /* high 16 bits of physical block */ 67 __u16 ei_unused; 68 }; 69 70 /* Each block (leaves and indexes), even inode-stored has header. */ 71 struct ext4_extent_header { 72 __le16 eh_magic; /* probably will support different formats */ 73 __le16 eh_entries; /* number of valid entries */ 74 __le16 eh_max; /* capacity of store in entries */ 75 __le16 eh_depth; /* has tree real underlying blocks? */ 76 __le32 eh_generation; /* generation of the tree */ 77 }; 78 79 struct ext_filesystem { 80 /* Total Sector of partition */ 81 uint64_t total_sect; 82 /* Block size of partition */ 83 uint32_t blksz; 84 /* Inode size of partition */ 85 uint32_t inodesz; 86 /* Sectors per Block */ 87 uint32_t sect_perblk; 88 /* Group Descriptor Block Number */ 89 uint32_t gdtable_blkno; 90 /* Total block groups of partition */ 91 uint32_t no_blkgrp; 92 /* No of blocks required for bgdtable */ 93 uint32_t no_blk_pergdt; 94 /* Superblock */ 95 struct ext2_sblock *sb; 96 /* Block group descritpor table */ 97 struct ext2_block_group *bgd; 98 char *gdtable; 99 100 /* Block Bitmap Related */ 101 unsigned char **blk_bmaps; 102 long int curr_blkno; 103 uint16_t first_pass_bbmap; 104 105 /* Inode Bitmap Related */ 106 unsigned char **inode_bmaps; 107 int curr_inode_no; 108 uint16_t first_pass_ibmap; 109 110 /* Journal Related */ 111 112 /* Block Device Descriptor */ 113 block_dev_desc_t *dev_desc; 114 }; 115 116 extern struct ext2_data *ext4fs_root; 117 extern struct ext2fs_node *ext4fs_file; 118 119 #if defined(CONFIG_EXT4_WRITE) 120 extern struct ext2_inode *g_parent_inode; 121 extern int gd_index; 122 extern int gindex; 123 124 int ext4fs_init(void); 125 void ext4fs_deinit(void); 126 int ext4fs_filename_check(char *filename); 127 int ext4fs_write(const char *fname, unsigned char *buffer, 128 unsigned long sizebytes); 129 #endif 130 131 struct ext_filesystem *get_fs(void); 132 int ext4fs_open(const char *filename); 133 int ext4fs_read(char *buf, unsigned len); 134 int ext4fs_mount(unsigned part_length); 135 void ext4fs_close(void); 136 int ext4fs_ls(const char *dirname); 137 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); 138 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf); 139 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info); 140 long int read_allocated_block(struct ext2_inode *inode, int fileblock); 141 #endif 142