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Diffstat (limited to 'include/ext4fs.h')
| -rw-r--r-- | include/ext4fs.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/include/ext4fs.h b/include/ext4fs.h new file mode 100644 index 0000000..58a6a1d --- /dev/null +++ b/include/ext4fs.h @@ -0,0 +1,132 @@ +/* + * (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 *gd; + 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 block_dev_desc_t *ext4_dev_desc; +extern struct ext2_data *ext4fs_root; +extern struct ext2fs_node *ext4fs_file; + +struct ext_filesystem *get_fs(void); +int init_fs(block_dev_desc_t *dev_desc); +void deinit_fs(block_dev_desc_t *dev_desc); +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); +int ext4fs_set_blk_dev(block_dev_desc_t *rbdd, int part); +long int read_allocated_block(struct ext2_inode *inode, int fileblock); +#endif |