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_FEATURE_INCOMPAT_64BIT 0x0080 36 #define EXT4_INDIRECT_BLOCKS 12 37 38 #define EXT4_BG_INODE_UNINIT 0x0001 39 #define EXT4_BG_BLOCK_UNINIT 0x0002 40 #define EXT4_BG_INODE_ZEROED 0x0004 41 42 /* 43 * ext4_inode has i_block array (60 bytes total). 44 * The first 12 bytes store ext4_extent_header; 45 * the remainder stores an array of ext4_extent. 46 */ 47 48 /* 49 * This is the extent on-disk structure. 50 * It's used at the bottom of the tree. 51 */ 52 struct ext4_extent { 53 __le32 ee_block; /* first logical block extent covers */ 54 __le16 ee_len; /* number of blocks covered by extent */ 55 __le16 ee_start_hi; /* high 16 bits of physical block */ 56 __le32 ee_start_lo; /* low 32 bits of physical block */ 57 }; 58 59 /* 60 * This is index on-disk structure. 61 * It's used at all the levels except the bottom. 62 */ 63 struct ext4_extent_idx { 64 __le32 ei_block; /* index covers logical blocks from 'block' */ 65 __le32 ei_leaf_lo; /* pointer to the physical block of the next * 66 * level. leaf or next index could be there */ 67 __le16 ei_leaf_hi; /* high 16 bits of physical block */ 68 __u16 ei_unused; 69 }; 70 71 /* Each block (leaves and indexes), even inode-stored has header. */ 72 struct ext4_extent_header { 73 __le16 eh_magic; /* probably will support different formats */ 74 __le16 eh_entries; /* number of valid entries */ 75 __le16 eh_max; /* capacity of store in entries */ 76 __le16 eh_depth; /* has tree real underlying blocks? */ 77 __le32 eh_generation; /* generation of the tree */ 78 }; 79 80 struct ext_filesystem { 81 /* Total Sector of partition */ 82 uint64_t total_sect; 83 /* Block size of partition */ 84 uint32_t blksz; 85 /* Inode size of partition */ 86 uint32_t inodesz; 87 /* Sectors per Block */ 88 uint32_t sect_perblk; 89 /* Group Descriptor Block Number */ 90 uint32_t gdtable_blkno; 91 /* Total block groups of partition */ 92 uint32_t no_blkgrp; 93 /* No of blocks required for bgdtable */ 94 uint32_t no_blk_pergdt; 95 /* Superblock */ 96 struct ext2_sblock *sb; 97 /* Block group descritpor table */ 98 struct ext2_block_group *bgd; 99 char *gdtable; 100 101 /* Block Bitmap Related */ 102 unsigned char **blk_bmaps; 103 long int curr_blkno; 104 uint16_t first_pass_bbmap; 105 106 /* Inode Bitmap Related */ 107 unsigned char **inode_bmaps; 108 int curr_inode_no; 109 uint16_t first_pass_ibmap; 110 111 /* Journal Related */ 112 113 /* Block Device Descriptor */ 114 struct blk_desc *dev_desc; 115 }; 116 117 extern struct ext2_data *ext4fs_root; 118 extern struct ext2fs_node *ext4fs_file; 119 120 #if defined(CONFIG_EXT4_WRITE) 121 extern struct ext2_inode *g_parent_inode; 122 extern int gd_index; 123 extern int gindex; 124 125 int ext4fs_init(void); 126 void ext4fs_deinit(void); 127 int ext4fs_filename_check(char *filename); 128 int ext4fs_write(const char *fname, unsigned char *buffer, 129 unsigned long sizebytes); 130 int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len, 131 loff_t *actwrite); 132 #endif 133 134 struct ext_filesystem *get_fs(void); 135 int ext4fs_open(const char *filename, loff_t *len); 136 int ext4fs_read(char *buf, loff_t len, loff_t *actread); 137 int ext4fs_mount(unsigned part_length); 138 void ext4fs_close(void); 139 void ext4fs_reinit_global(void); 140 int ext4fs_ls(const char *dirname); 141 int ext4fs_exists(const char *filename); 142 int ext4fs_size(const char *filename, loff_t *size); 143 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); 144 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf); 145 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info); 146 long int read_allocated_block(struct ext2_inode *inode, int fileblock); 147 int ext4fs_probe(struct blk_desc *fs_dev_desc, 148 disk_partition_t *fs_partition); 149 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len, 150 loff_t *actread); 151 int ext4_read_superblock(char *buffer); 152 int ext4fs_uuid(char *uuid_str); 153 #endif 154