ext4fs.h 4.54 KB
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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_EXTENTS_FL		0x00080000 /* Inode uses extents */
#define EXT4_EXT_MAGIC			0xf30a
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM	0x0010
#define EXT4_FEATURE_INCOMPAT_EXTENTS	0x0040
#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 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 */
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	struct ext2_block_group *bgd;
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	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 */
	block_dev_desc_t *dev_desc;
};

extern struct ext2_data *ext4fs_root;
extern struct ext2fs_node *ext4fs_file;

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#if defined(CONFIG_EXT4_WRITE)
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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_check(char *filename);
int ext4fs_write(const char *fname, unsigned char *buffer,
				unsigned long sizebytes);
#endif

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struct ext_filesystem *get_fs(void);
int ext4fs_open(const char *filename);
int ext4fs_read(char *buf, unsigned len);
int ext4fs_mount(unsigned part_length);
void ext4fs_close(void);
int ext4fs_ls(const char *dirname);
void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
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int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
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void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
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long int read_allocated_block(struct ext2_inode *inode, int fileblock);
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int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
		 disk_partition_t *fs_partition);
int ext4_read_file(const char *filename, void *buf, int offset, int len);
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int ext4_read_superblock(char *buffer);
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#endif