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a1596438 US |
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 | |
6f94ab66 | 35 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 |
a1596438 US |
36 | #define EXT4_INDIRECT_BLOCKS 12 |
37 | ||
38 | #define EXT4_BG_INODE_UNINIT 0x0001 | |
39 | #define EXT4_BG_BLOCK_UNINIT 0x0002 | |
40 | #define EXT4_BG_INODE_ZEROED 0x0004 | |
41 | ||
42 | /* | |
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. | |
46 | */ | |
47 | ||
48 | /* | |
49 | * This is the extent on-disk structure. | |
50 | * It's used at the bottom of the tree. | |
51 | */ | |
52 | struct ext4_extent { | |
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 */ | |
57 | }; | |
58 | ||
59 | /* | |
60 | * This is index on-disk structure. | |
61 | * It's used at all the levels except the bottom. | |
62 | */ | |
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 */ | |
68 | __u16 ei_unused; | |
69 | }; | |
70 | ||
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 */ | |
78 | }; | |
79 | ||
80 | struct ext_filesystem { | |
81 | /* Total Sector of partition */ | |
82 | uint64_t total_sect; | |
83 | /* Block size of partition */ | |
84 | uint32_t blksz; | |
85 | /* Inode size of partition */ | |
86 | uint32_t inodesz; | |
87 | /* Sectors per Block */ | |
88 | uint32_t sect_perblk; | |
89 | /* Group Descriptor Block Number */ | |
90 | uint32_t gdtable_blkno; | |
91 | /* Total block groups of partition */ | |
92 | uint32_t no_blkgrp; | |
93 | /* No of blocks required for bgdtable */ | |
94 | uint32_t no_blk_pergdt; | |
95 | /* Superblock */ | |
96 | struct ext2_sblock *sb; | |
97 | /* Block group descritpor table */ | |
73c15c63 | 98 | struct ext2_block_group *bgd; |
a1596438 US |
99 | char *gdtable; |
100 | ||
101 | /* Block Bitmap Related */ | |
102 | unsigned char **blk_bmaps; | |
103 | long int curr_blkno; | |
104 | uint16_t first_pass_bbmap; | |
105 | ||
106 | /* Inode Bitmap Related */ | |
107 | unsigned char **inode_bmaps; | |
108 | int curr_inode_no; | |
109 | uint16_t first_pass_ibmap; | |
110 | ||
111 | /* Journal Related */ | |
112 | ||
113 | /* Block Device Descriptor */ | |
4101f687 | 114 | struct blk_desc *dev_desc; |
a1596438 US |
115 | }; |
116 | ||
a1596438 US |
117 | extern struct ext2_data *ext4fs_root; |
118 | extern struct ext2fs_node *ext4fs_file; | |
119 | ||
03e2ecf6 | 120 | #if defined(CONFIG_EXT4_WRITE) |
ed34f34d US |
121 | extern struct ext2_inode *g_parent_inode; |
122 | extern int gd_index; | |
123 | extern int gindex; | |
124 | ||
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, | |
9f12cd0e SR |
129 | unsigned long sizebytes); |
130 | int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len, | |
131 | loff_t *actwrite); | |
ed34f34d US |
132 | #endif |
133 | ||
a1596438 | 134 | struct ext_filesystem *get_fs(void); |
9f12cd0e SR |
135 | int ext4fs_open(const char *filename, loff_t *len); |
136 | int ext4fs_read(char *buf, loff_t len, loff_t *actread); | |
a1596438 US |
137 | int ext4fs_mount(unsigned part_length); |
138 | void ext4fs_close(void); | |
8b454eee | 139 | void ext4fs_reinit_global(void); |
a1596438 | 140 | int ext4fs_ls(const char *dirname); |
55af5c93 | 141 | int ext4fs_exists(const char *filename); |
d455d878 | 142 | int ext4fs_size(const char *filename, loff_t *size); |
a1596438 | 143 | void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); |
04735e9c | 144 | int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf); |
4101f687 | 145 | void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info); |
a1596438 | 146 | long int read_allocated_block(struct ext2_inode *inode, int fileblock); |
4101f687 | 147 | int ext4fs_probe(struct blk_desc *fs_dev_desc, |
e6d52415 | 148 | disk_partition_t *fs_partition); |
d455d878 SR |
149 | int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len, |
150 | loff_t *actread); | |
50ce4c07 | 151 | int ext4_read_superblock(char *buffer); |
59e890ef | 152 | int ext4fs_uuid(char *uuid_str); |
a1596438 | 153 | #endif |