LXR uboot/include/ext4fs.h

   1/*
   2 * (C) Copyright 2011 - 2012 Samsung Electronics
   3 * EXT4 filesystem implementation in Uboot by
   4 * Uma Shankar <uma.shankar@samsung.com>
   5 * Manjunatha C Achar <a.manjunatha@samsung.com>
   6 *
   7 * Ext4 Extent data structures are taken from  original ext4 fs code
   8 * as found in the linux kernel.
   9 *
  10 * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
  11 * Written by Alex Tomas <alex@clusterfs.com>
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License version 2 as
  15 * published by the Free Software Foundation.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 */
  26
  27#ifndef __EXT4__
  28#define __EXT4__
  29#include <ext_common.h>
  30
  31#define EXT4_EXTENTS_FL         0x00080000 /* Inode uses extents */
  32#define EXT4_EXT_MAGIC                  0xf30a
  33#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
  34#define EXT4_FEATURE_INCOMPAT_EXTENTS   0x0040
  35#define EXT4_INDIRECT_BLOCKS            12
  36
  37#define EXT4_BG_INODE_UNINIT            0x0001
  38#define EXT4_BG_BLOCK_UNINIT            0x0002
  39#define EXT4_BG_INODE_ZEROED            0x0004
  40
  41/*
  42 * ext4_inode has i_block array (60 bytes total).
  43 * The first 12 bytes store ext4_extent_header;
  44 * the remainder stores an array of ext4_extent.
  45 */
  46
  47/*
  48 * This is the extent on-disk structure.
  49 * It's used at the bottom of the tree.
  50 */
  51struct ext4_extent {
  52        __le32  ee_block;       /* first logical block extent covers */
  53        __le16  ee_len;         /* number of blocks covered by extent */
  54        __le16  ee_start_hi;    /* high 16 bits of physical block */
  55        __le32  ee_start_lo;    /* low 32 bits of physical block */
  56};
  57
  58/*
  59 * This is index on-disk structure.
  60 * It's used at all the levels except the bottom.
  61 */
  62struct ext4_extent_idx {
  63        __le32  ei_block;       /* index covers logical blocks from 'block' */
  64        __le32  ei_leaf_lo;     /* pointer to the physical block of the next *
  65                                 * level. leaf or next index could be there */
  66        __le16  ei_leaf_hi;     /* high 16 bits of physical block */
  67        __u16   ei_unused;
  68};
  69
  70/* Each block (leaves and indexes), even inode-stored has header. */
  71struct ext4_extent_header {
  72        __le16  eh_magic;       /* probably will support different formats */
  73        __le16  eh_entries;     /* number of valid entries */
  74        __le16  eh_max;         /* capacity of store in entries */
  75        __le16  eh_depth;       /* has tree real underlying blocks? */
  76        __le32  eh_generation;  /* generation of the tree */
  77};
  78
  79struct ext_filesystem {
  80        /* Total Sector of partition */
  81        uint64_t total_sect;
  82        /* Block size  of partition */
  83        uint32_t blksz;
  84        /* Inode size of partition */
  85        uint32_t inodesz;
  86        /* Sectors per Block */
  87        uint32_t sect_perblk;
  88        /* Group Descriptor Block Number */
  89        uint32_t gdtable_blkno;
  90        /* Total block groups of partition */
  91        uint32_t no_blkgrp;
  92        /* No of blocks required for bgdtable */
  93        uint32_t no_blk_pergdt;
  94        /* Superblock */
  95        struct ext2_sblock *sb;
  96        /* Block group descritpor table */
  97        struct ext2_block_group *bgd;
  98        char *gdtable;
  99
 100        /* Block Bitmap Related */
 101        unsigned char **blk_bmaps;
 102        long int curr_blkno;
 103        uint16_t first_pass_bbmap;
 104
 105        /* Inode Bitmap Related */
 106        unsigned char **inode_bmaps;
 107        int curr_inode_no;
 108        uint16_t first_pass_ibmap;
 109
 110        /* Journal Related */
 111
 112        /* Block Device Descriptor */
 113        block_dev_desc_t *dev_desc;
 114};
 115
 116extern struct ext2_data *ext4fs_root;
 117extern struct ext2fs_node *ext4fs_file;
 118
 119#if defined(CONFIG_EXT4_WRITE)
 120extern struct ext2_inode *g_parent_inode;
 121extern int gd_index;
 122extern int gindex;
 123
 124int ext4fs_init(void);
 125void ext4fs_deinit(void);
 126int ext4fs_filename_check(char *filename);
 127int ext4fs_write(const char *fname, unsigned char *buffer,
 128                                unsigned long sizebytes);
 129#endif
 130
 131struct ext_filesystem *get_fs(void);
 132int ext4fs_open(const char *filename);
 133int ext4fs_read(char *buf, unsigned len);
 134int ext4fs_mount(unsigned part_length);
 135void ext4fs_close(void);
 136int ext4fs_ls(const char *dirname);
 137int ext4fs_exists(const char *filename);
 138void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
 139int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
 140void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
 141long int read_allocated_block(struct ext2_inode *inode, int fileblock);
 142int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
 143                 disk_partition_t *fs_partition);
 144int ext4_read_file(const char *filename, void *buf, int offset, int len);
 145int ext4_read_superblock(char *buffer);
 146#endif
 147