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  */
  51 struct 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  */
  62 struct 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. */
  71 struct 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
  79 struct 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         struct blk_desc *dev_desc;
 114 };
 115
 116 extern struct ext2_data *ext4fs_root;
 117 extern struct ext2fs_node *ext4fs_file;
 118
 119 #if defined(CONFIG_EXT4_WRITE)
 120 extern struct ext2_inode *g_parent_inode;
 121 extern int gd_index;
 122 extern int gindex;
 123
 124 int ext4fs_init(void);
 125 void ext4fs_deinit(void);
 126 int ext4fs_filename_check(char *filename);
 127 int ext4fs_write(const char *fname, unsigned char *buffer,
 128                  unsigned long sizebytes);
 129 int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len,
 130                     loff_t *actwrite);
 131 #endif
 132
 133 struct ext_filesystem *get_fs(void);
 134 int ext4fs_open(const char *filename, loff_t *len);
 135 int ext4fs_read(char *buf, loff_t len, loff_t *actread);
 136 int ext4fs_mount(unsigned part_length);
 137 void ext4fs_close(void);
 138 void ext4fs_reinit_global(void);
 139 int ext4fs_ls(const char *dirname);
 140 int ext4fs_exists(const char *filename);
 141 int ext4fs_size(const char *filename, loff_t *size);
 142 void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot);
 143 int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf);
 144 void ext4fs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info);
 145 long int read_allocated_block(struct ext2_inode *inode, int fileblock);
 146 int ext4fs_probe(struct blk_desc *fs_dev_desc,
 147                  disk_partition_t *fs_partition);
 148 int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
 149                    loff_t *actread);
 150 int ext4_read_superblock(char *buffer);
 151 int ext4fs_uuid(char *uuid_str);
 152 #endif