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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_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