xref: /openbmc/u-boot/include/ext4fs.h (revision 9b914727)
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_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  */
51 struct 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  */
62 struct 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. */
71 struct 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 
79 struct 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 
116 extern struct ext2_data *ext4fs_root;
117 extern struct ext2fs_node *ext4fs_file;
118 
119 #if defined(CONFIG_CMD_EXT4_WRITE)
120 extern struct ext2_inode *g_parent_inode;
121 extern int gd_index;
122 extern int gindex;
123 
124 int ext4fs_init(void);
125 void ext4fs_deinit(void);
126 int ext4fs_filename_check(char *filename);
127 int ext4fs_write(const char *fname, unsigned char *buffer,
128 				unsigned long sizebytes);
129 #endif
130 
131 struct ext_filesystem *get_fs(void);
132 int ext4fs_open(const char *filename);
133 int ext4fs_read(char *buf, unsigned len);
134 int ext4fs_mount(unsigned part_length);
135 void ext4fs_close(void);
136 int ext4fs_ls(const char *dirname);
137 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
138 int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf);
139 void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
140 long int read_allocated_block(struct ext2_inode *inode, int fileblock);
141 #endif
142