03e2ecf6b8
This makes the FAT and ext4 filesystem implementations build if
CONFIG_FS_{FAT,EXT4} are defined, rather than basing the build on
whether CONFIG_CMD_{FAT,EXT*} are defined. This will allow the
filesystems to be built separately from the filesystem-specific commands
that use them. This paves the way for the creation of filesystem-generic
commands that used the filesystems, without requiring the filesystem-
specific commands.
Minor documentation changes are made for this change.
The new config options are automatically selected by the old config
options to retain backwards-compatibility.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
|
|
* (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 */
|
|
struct ext2_block_group *bgd;
|
|
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;
|
|
|
|
#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_check(char *filename);
|
|
int ext4fs_write(const char *fname, unsigned char *buffer,
|
|
unsigned long sizebytes);
|
|
#endif
|
|
|
|
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);
|
|
int ext4fs_devread(int sector, int byte_offset, int byte_len, char *buf);
|
|
void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
|
|
long int read_allocated_block(struct ext2_inode *inode, int fileblock);
|
|
#endif
|