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ext4fs.h
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ext4fs.h
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/*
* (C) Copyright 2011 - 2012 Samsung Electronics
* EXT4 filesystem implementation in Uboot by
* Uma Shankar <uma.shankar@samsung.com>
* Manjunatha C Achar <a.manjunatha@samsung.com>
*
* Ext4 Extent data structures are taken from original ext4 fs code
* as found in the linux kernel.
*
* Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
* Written by Alex Tomas <alex@clusterfs.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __EXT4__
#define __EXT4__
#include <ext_common.h>
#define EXT4_INDEX_FL 0x00001000 /* Inode uses hash tree index */
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT4_EXT_MAGIC 0xf30a
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
#define EXT4_INDIRECT_BLOCKS 12
#define EXT4_BG_INODE_UNINIT 0x0001
#define EXT4_BG_BLOCK_UNINIT 0x0002
#define EXT4_BG_INODE_ZEROED 0x0004
/*
* ext4_inode has i_block array (60 bytes total).
* The first 12 bytes store ext4_extent_header;
* the remainder stores an array of ext4_extent.
*/
/*
* This is the extent on-disk structure.
* It's used at the bottom of the tree.
*/
struct ext4_extent {
__le32 ee_block; /* first logical block extent covers */
__le16 ee_len; /* number of blocks covered by extent */
__le16 ee_start_hi; /* high 16 bits of physical block */
__le32 ee_start_lo; /* low 32 bits of physical block */
};
/*
* This is index on-disk structure.
* It's used at all the levels except the bottom.
*/
struct ext4_extent_idx {
__le32 ei_block; /* index covers logical blocks from 'block' */
__le32 ei_leaf_lo; /* pointer to the physical block of the next *
* level. leaf or next index could be there */
__le16 ei_leaf_hi; /* high 16 bits of physical block */
__u16 ei_unused;
};
/* Each block (leaves and indexes), even inode-stored has header. */
struct ext4_extent_header {
__le16 eh_magic; /* probably will support different formats */
__le16 eh_entries; /* number of valid entries */
__le16 eh_max; /* capacity of store in entries */
__le16 eh_depth; /* has tree real underlying blocks? */
__le32 eh_generation; /* generation of the tree */
};
struct ext_filesystem {
/* Total Sector of partition */
uint64_t total_sect;
/* Block size of partition */
uint32_t blksz;
/* Inode size of partition */
uint32_t inodesz;
/* Sectors per Block */
uint32_t sect_perblk;
/* Group Descriptor size */
uint16_t gdsize;
/* Group Descriptor Block Number */
uint32_t gdtable_blkno;
/* Total block groups of partition */
uint32_t no_blkgrp;
/* No of blocks required for bgdtable */
uint32_t no_blk_pergdt;
/* Superblock */
struct ext2_sblock *sb;
/* Block group descritpor table */
char *gdtable;
/* Block Bitmap Related */
unsigned char **blk_bmaps;
long int curr_blkno;
uint16_t first_pass_bbmap;
/* Inode Bitmap Related */
unsigned char **inode_bmaps;
int curr_inode_no;
uint16_t first_pass_ibmap;
/* Journal Related */
/* Block Device Descriptor */
struct blk_desc *dev_desc;
};
struct ext_block_cache {
char *buf;
lbaint_t block;
int size;
};
extern struct ext2_data *ext4fs_root;
extern struct ext2fs_node *ext4fs_file;
#if defined(CONFIG_EXT4_WRITE)
extern struct ext2_inode *g_parent_inode;
extern int gd_index;
extern int gindex;
int ext4fs_init(void);
void ext4fs_deinit(void);
int ext4fs_filename_unlink(char *filename);
int ext4fs_write(const char *fname, unsigned char *buffer,
unsigned long sizebytes);
int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len,
loff_t *actwrite);
#endif
struct ext_filesystem *get_fs(void);
int ext4fs_open(const char *filename, loff_t *len);
int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread);
int ext4fs_mount(unsigned part_length);
void ext4fs_close(void);
void ext4fs_reinit_global(void);
int ext4fs_ls(const char *dirname);
int ext4fs_exists(const char *filename);
int ext4fs_size(const char *filename, loff_t *size);
void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info);
long int read_allocated_block(struct ext2_inode *inode, int fileblock,
struct ext_block_cache *cache);
int ext4fs_probe(struct blk_desc *fs_dev_desc,
disk_partition_t *fs_partition);
int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
loff_t *actread);
int ext4_read_superblock(char *buffer);
int ext4fs_uuid(char *uuid_str);
void ext_cache_init(struct ext_block_cache *cache);
void ext_cache_fini(struct ext_block_cache *cache);
int ext_cache_read(struct ext_block_cache *cache, lbaint_t block, int size);
#endif