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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_FEATURE_INCOMPAT_64BIT 0x0080
36 #define EXT4_INDIRECT_BLOCKS 12
38 #define EXT4_BG_INODE_UNINIT 0x0001
39 #define EXT4_BG_BLOCK_UNINIT 0x0002
40 #define EXT4_BG_INODE_ZEROED 0x0004
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.
49 * This is the extent on-disk structure.
50 * It's used at the bottom of the tree.
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 */
60 * This is index on-disk structure.
61 * It's used at all the levels except the bottom.
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 */
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 */
80 struct ext_filesystem
{
81 /* Total Sector of partition */
83 /* Block size of partition */
85 /* Inode size of partition */
87 /* Sectors per Block */
89 /* Group Descriptor Block Number */
90 uint32_t gdtable_blkno
;
91 /* Total block groups of partition */
93 /* No of blocks required for bgdtable */
94 uint32_t no_blk_pergdt
;
96 struct ext2_sblock
*sb
;
97 /* Block group descritpor table */
98 struct ext2_block_group
*bgd
;
101 /* Block Bitmap Related */
102 unsigned char **blk_bmaps
;
104 uint16_t first_pass_bbmap
;
106 /* Inode Bitmap Related */
107 unsigned char **inode_bmaps
;
109 uint16_t first_pass_ibmap
;
111 /* Journal Related */
113 /* Block Device Descriptor */
114 struct blk_desc
*dev_desc
;
117 extern struct ext2_data
*ext4fs_root
;
118 extern struct ext2fs_node
*ext4fs_file
;
120 #if defined(CONFIG_EXT4_WRITE)
121 extern struct ext2_inode
*g_parent_inode
;
125 int ext4fs_init(void);
126 void ext4fs_deinit(void);
127 int ext4fs_filename_unlink(char *filename
);
128 int ext4fs_write(const char *fname
, unsigned char *buffer
,
129 unsigned long sizebytes
);
130 int ext4_write_file(const char *filename
, void *buf
, loff_t offset
, loff_t len
,
134 struct ext_filesystem
*get_fs(void);
135 int ext4fs_open(const char *filename
, loff_t
*len
);
136 int ext4fs_read(char *buf
, loff_t len
, loff_t
*actread
);
137 int ext4fs_mount(unsigned part_length
);
138 void ext4fs_close(void);
139 void ext4fs_reinit_global(void);
140 int ext4fs_ls(const char *dirname
);
141 int ext4fs_exists(const char *filename
);
142 int ext4fs_size(const char *filename
, loff_t
*size
);
143 void ext4fs_free_node(struct ext2fs_node
*node
, struct ext2fs_node
*currroot
);
144 int ext4fs_devread(lbaint_t sector
, int byte_offset
, int byte_len
, char *buf
);
145 void ext4fs_set_blk_dev(struct blk_desc
*rbdd
, disk_partition_t
*info
);
146 long int read_allocated_block(struct ext2_inode
*inode
, int fileblock
);
147 int ext4fs_probe(struct blk_desc
*fs_dev_desc
,
148 disk_partition_t
*fs_partition
);
149 int ext4_read_file(const char *filename
, void *buf
, loff_t offset
, loff_t len
,
151 int ext4_read_superblock(char *buffer
);
152 int ext4fs_uuid(char *uuid_str
);