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Uma Shankara1596432012-05-25 21:21:44 +05301/*
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 */
51struct 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 */
62struct 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. */
71struct 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
79struct 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 *gd;
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
116extern block_dev_desc_t *ext4_dev_desc;
117extern struct ext2_data *ext4fs_root;
118extern struct ext2fs_node *ext4fs_file;
119
Uma Shankared34f342012-05-25 21:22:49 +0530120#if defined(CONFIG_CMD_EXT4_WRITE)
121extern struct ext2_inode *g_parent_inode;
122extern int gd_index;
123extern int gindex;
124
125int ext4fs_init(void);
126void ext4fs_deinit(void);
127int ext4fs_filename_check(char *filename);
128int ext4fs_write(const char *fname, unsigned char *buffer,
129 unsigned long sizebytes);
130#endif
131
Uma Shankara1596432012-05-25 21:21:44 +0530132struct ext_filesystem *get_fs(void);
133int init_fs(block_dev_desc_t *dev_desc);
134void deinit_fs(block_dev_desc_t *dev_desc);
135int ext4fs_open(const char *filename);
136int ext4fs_read(char *buf, unsigned len);
137int ext4fs_mount(unsigned part_length);
138void ext4fs_close(void);
139int ext4fs_ls(const char *dirname);
140void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
141int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf);
142int ext4fs_set_blk_dev(block_dev_desc_t *rbdd, int part);
143long int read_allocated_block(struct ext2_inode *inode, int fileblock);
144#endif