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git.ipfire.org Git - people/ms/u-boot.git/blob - include/ext4fs.h
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>
7 * Ext4 Extent data structures are taken from original ext4 fs code
8 * as found in the linux kernel.
10 * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
11 * Written by Alex Tomas <alex@clusterfs.com>
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.
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.
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.
29 #include <ext_common.h>
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
37 #define EXT4_BG_INODE_UNINIT 0x0001
38 #define EXT4_BG_BLOCK_UNINIT 0x0002
39 #define EXT4_BG_INODE_ZEROED 0x0004
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.
48 * This is the extent on-disk structure.
49 * It's used at the bottom of the tree.
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 */
59 * This is index on-disk structure.
60 * It's used at all the levels except the bottom.
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 */
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 */
79 struct ext_filesystem
{
80 /* Total Sector of partition */
82 /* Block size of partition */
84 /* Inode size of partition */
86 /* Sectors per Block */
88 /* Group Descriptor Block Number */
89 uint32_t gdtable_blkno
;
90 /* Total block groups of partition */
92 /* No of blocks required for bgdtable */
93 uint32_t no_blk_pergdt
;
95 struct ext2_sblock
*sb
;
96 /* Block group descritpor table */
97 struct ext2_block_group
*bgd
;
100 /* Block Bitmap Related */
101 unsigned char **blk_bmaps
;
103 uint16_t first_pass_bbmap
;
105 /* Inode Bitmap Related */
106 unsigned char **inode_bmaps
;
108 uint16_t first_pass_ibmap
;
110 /* Journal Related */
112 /* Block Device Descriptor */
113 block_dev_desc_t
*dev_desc
;
116 extern struct ext2_data
*ext4fs_root
;
117 extern struct ext2fs_node
*ext4fs_file
;
119 #if defined(CONFIG_EXT4_WRITE)
120 extern struct ext2_inode
*g_parent_inode
;
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
,
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
,
150 int ext4_read_superblock(char *buffer
);
151 int ext4fs_uuid(char *uuid_str
);