/* * (C) Copyright 2011 - 2012 Samsung Electronics * EXT4 filesystem implementation in Uboot by * Uma Shankar * Manjunatha C Achar * * 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 * * 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 struct disk_partition; #define EXT4_INDEX_FL 0x00001000 /* Inode uses hash tree index */ #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ #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, const char *buffer, unsigned long sizebytes, int type); int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len, loff_t *actwrite); int ext4fs_create_link(const char *target, const char *fname); #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(void); 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, struct disk_partition *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, struct disk_partition *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