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>
7 * Ext4 Extent data structures are taken from original ext4 fs code
8 * as found in the linux kernel.
10 * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
11 * Written by Alex Tomas <alex@clusterfs.com>
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.
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.
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.
29 #include <ext_common.h>
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
38 #define EXT4_BG_INODE_UNINIT 0x0001
39 #define EXT4_BG_BLOCK_UNINIT 0x0002
40 #define EXT4_BG_INODE_ZEROED 0x0004
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.
49 * This is the extent on-disk structure.
50 * It's used at the bottom of the tree.
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 */
60 * This is index on-disk structure.
61 * It's used at all the levels except the bottom.
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 */
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 */
80 struct ext_filesystem {
81 /* Total Sector of partition */
83 /* Block size of partition */
85 /* Inode size of partition */
87 /* Sectors per Block */
89 /* Group Descriptor Block Number */
90 uint32_t gdtable_blkno;
91 /* Total block groups of partition */
93 /* No of blocks required for bgdtable */
94 uint32_t no_blk_pergdt;
96 struct ext2_sblock *sb;
97 /* Block group descritpor table */
98 struct ext2_block_group *bgd;
101 /* Block Bitmap Related */
102 unsigned char **blk_bmaps;
104 uint16_t first_pass_bbmap;
106 /* Inode Bitmap Related */
107 unsigned char **inode_bmaps;
109 uint16_t first_pass_ibmap;
111 /* Journal Related */
113 /* Block Device Descriptor */
114 struct blk_desc *dev_desc;
117 extern struct ext2_data *ext4fs_root;
118 extern struct ext2fs_node *ext4fs_file;
120 #if defined(CONFIG_EXT4_WRITE)
121 extern struct ext2_inode *g_parent_inode;
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,
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,
151 int ext4_read_superblock(char *buffer);
152 int ext4fs_uuid(char *uuid_str);