1 /* 2 * (C) Copyright 2011 - 2012 Samsung Electronics 3 * EXT4 filesystem implementation in Uboot by 4 * Uma Shankar <uma.shankar (at) samsung.com> 5 * Manjunatha C Achar <a.manjunatha (at) 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 (at) clusterfs.com 11 * Written by Alex Tomas <alex (at) 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_INDEX_FL 0x00001000 /* Inode uses hash tree index */ 32 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 33 #define EXT4_EXT_MAGIC 0xf30a 34 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 35 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 36 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 37 #define EXT4_INDIRECT_BLOCKS 12 38 39 #define EXT4_BG_INODE_UNINIT 0x0001 40 #define EXT4_BG_BLOCK_UNINIT 0x0002 41 #define EXT4_BG_INODE_ZEROED 0x0004 42 43 /* 44 * ext4_inode has i_block array (60 bytes total). 45 * The first 12 bytes store ext4_extent_header; 46 * the remainder stores an array of ext4_extent. 47 */ 48 49 /* 50 * This is the extent on-disk structure. 51 * It's used at the bottom of the tree. 52 */ 53 struct ext4_extent { 54 __le32 ee_block; /* first logical block extent covers */ 55 __le16 ee_len; /* number of blocks covered by extent */ 56 __le16 ee_start_hi; /* high 16 bits of physical block */ 57 __le32 ee_start_lo; /* low 32 bits of physical block */ 58 }; 59 60 /* 61 * This is index on-disk structure. 62 * It's used at all the levels except the bottom. 63 */ 64 struct ext4_extent_idx { 65 __le32 ei_block; /* index covers logical blocks from 'block' */ 66 __le32 ei_leaf_lo; /* pointer to the physical block of the next * 67 * level. leaf or next index could be there */ 68 __le16 ei_leaf_hi; /* high 16 bits of physical block */ 69 __u16 ei_unused; 70 }; 71 72 /* Each block (leaves and indexes), even inode-stored has header. */ 73 struct ext4_extent_header { 74 __le16 eh_magic; /* probably will support different formats */ 75 __le16 eh_entries; /* number of valid entries */ 76 __le16 eh_max; /* capacity of store in entries */ 77 __le16 eh_depth; /* has tree real underlying blocks? */ 78 __le32 eh_generation; /* generation of the tree */ 79 }; 80 81 struct ext_filesystem { 82 /* Total Sector of partition */ 83 uint64_t total_sect; 84 /* Block size of partition */ 85 uint32_t blksz; 86 /* Inode size of partition */ 87 uint32_t inodesz; 88 /* Sectors per Block */ 89 uint32_t sect_perblk; 90 /* Group Descriptor size */ 91 uint16_t gdsize; 92 /* Group Descriptor Block Number */ 93 uint32_t gdtable_blkno; 94 /* Total block groups of partition */ 95 uint32_t no_blkgrp; 96 /* No of blocks required for bgdtable */ 97 uint32_t no_blk_pergdt; 98 /* Superblock */ 99 struct ext2_sblock *sb; 100 /* Block group descritpor table */ 101 char *gdtable; 102 103 /* Block Bitmap Related */ 104 unsigned char **blk_bmaps; 105 long int curr_blkno; 106 uint16_t first_pass_bbmap; 107 108 /* Inode Bitmap Related */ 109 unsigned char **inode_bmaps; 110 int curr_inode_no; 111 uint16_t first_pass_ibmap; 112 113 /* Journal Related */ 114 115 /* Block Device Descriptor */ 116 struct blk_desc *dev_desc; 117 }; 118 119 extern struct ext2_data *ext4fs_root; 120 extern struct ext2fs_node *ext4fs_file; 121 122 #if defined(CONFIG_EXT4_WRITE) 123 extern struct ext2_inode *g_parent_inode; 124 extern int gd_index; 125 extern int gindex; 126 127 int ext4fs_init(void); 128 void ext4fs_deinit(void); 129 int ext4fs_filename_unlink(char *filename); 130 int ext4fs_write(const char *fname, unsigned char *buffer, 131 unsigned long sizebytes); 132 int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len, 133 loff_t *actwrite); 134 #endif 135 136 struct ext_filesystem *get_fs(void); 137 int ext4fs_open(const char *filename, loff_t *len); 138 int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread); 139 int ext4fs_mount(unsigned part_length); 140 void ext4fs_close(void); 141 void ext4fs_reinit_global(void); 142 int ext4fs_ls(const char *dirname); 143 int ext4fs_exists(const char *filename); 144 int ext4fs_size(const char *filename, loff_t *size); 145 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); 146 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf); 147 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info); 148 long int read_allocated_block(struct ext2_inode *inode, int fileblock); 149 int ext4fs_probe(struct blk_desc *fs_dev_desc, 150 disk_partition_t *fs_partition); 151 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len, 152 loff_t *actread); 153 int ext4_read_superblock(char *buffer); 154 int ext4fs_uuid(char *uuid_str); 155 #endif 156
