--- /dev/null
+/*
+ * (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);
+void ext4fs_reinit_global(void);
+int ext4fs_ls(const char *dirname);
+int ext4fs_exists(const char *filename);
+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(block_dev_desc_t *rbdd, disk_partition_t *info);
+long int read_allocated_block(struct ext2_inode *inode, int fileblock);
+int ext4fs_probe(block_dev_desc_t *fs_dev_desc,
+ disk_partition_t *fs_partition);
+int ext4_read_file(const char *filename, void *buf, int offset, int len);
+int ext4_read_superblock(char *buffer);
+#endif
Code Review / kvmfornfv.git / blobdiff