blob: 6888adc56f406d1c40049e240f8dc727e4e97009
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 *bgd; |
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_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 | int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len, |
130 | loff_t *actwrite); |
131 | #endif |
132 | |
133 | struct ext_filesystem *get_fs(void); |
134 | int ext4fs_open(const char *filename, loff_t *len); |
135 | int ext4fs_read(char *buf, loff_t len, loff_t *actread); |
136 | int ext4fs_mount(unsigned part_length); |
137 | void ext4fs_close(void); |
138 | void ext4fs_reinit_global(void); |
139 | int ext4fs_ls(const char *dirname); |
140 | int ext4fs_exists(const char *filename); |
141 | int ext4fs_size(const char *filename, loff_t *size); |
142 | void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); |
143 | int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf); |
144 | void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info); |
145 | long int read_allocated_block(struct ext2_inode *inode, int fileblock); |
146 | int ext4fs_probe(block_dev_desc_t *fs_dev_desc, |
147 | disk_partition_t *fs_partition); |
148 | int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len, |
149 | loff_t *actread); |
150 | int ext4_read_superblock(char *buffer); |
151 | int ext4fs_uuid(char *uuid_str); |
152 | #endif |
153 |