ext4fs ls load support

Signed-off-by: Uma Shankar <uma.shankar@samsung.com>
Signed-off-by: Manjunatha C Achar <a.manjunatha@samsung.com>
Signed-off-by: Iqbal Shareef <iqbal.ams@samsung.com>
Signed-off-by: Hakgoo Lee <goodguy.lee@samsung.com>

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