From d04075478d378d9e15f3e1abfd14b0bd124077d4 Mon Sep 17 00:00:00 2001
From: Kevin
Date: Sat, 15 Nov 2014 11:48:36 +0800
Subject: init commit via android 4.4 uboot

---
 fs/ext2/dev.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100755 fs/ext2/dev.c

(limited to 'fs/ext2/dev.c')

diff --git a/fs/ext2/dev.c b/fs/ext2/dev.c
new file mode 100755
index 0000000..1469e98
--- /dev/null
+++ b/fs/ext2/dev.c
@@ -0,0 +1,126 @@
+/*
+ * (C) Copyright 2004
+ *  esd gmbh <www.esd-electronics.com>
+ *  Reinhard Arlt <reinhard.arlt@esd-electronics.com>
+ *
+ *  based on code of fs/reiserfs/dev.c by
+ *
+ *  (C) Copyright 2003 - 2004
+ *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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.
+ */
+
+
+#include <common.h>
+#if (CONFIG_COMMANDS & CFG_CMD_EXT2)
+
+#include <config.h>
+#include <ext2fs.h>
+
+static block_dev_desc_t *ext2fs_block_dev_desc;
+static disk_partition_t part_info;
+
+int ext2fs_set_blk_dev (block_dev_desc_t * rbdd, int part)
+{
+	ext2fs_block_dev_desc = rbdd;
+
+	if (part == 0) {
+		/* disk doesn't use partition table */
+		part_info.start = 0;
+		part_info.size = rbdd->lba;
+		part_info.blksz = rbdd->blksz;
+	} else {
+		if (get_partition_info
+		    (ext2fs_block_dev_desc, part, &part_info)) {
+			return 0;
+		}
+	}
+	return (part_info.size);
+}
+
+
+int ext2fs_devread (int sector, int byte_offset, int byte_len, char *buf) {
+	char sec_buf[SECTOR_SIZE];
+	unsigned block_len;
+
+/*
+ *  Check partition boundaries
+ */
+	if ((sector < 0)
+	    || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
+		part_info.size)) {
+	/*      errnum = ERR_OUTSIDE_PART; */
+		printf (" ** ext2fs_devread() read outside partition sector %d\n", sector);
+		return (0);
+	}
+
+/*
+ *  Get the read to the beginning of a partition.
+ */
+	sector += byte_offset >> SECTOR_BITS;
+	byte_offset &= SECTOR_SIZE - 1;
+
+	debug (" <%d, %d, %d>\n", sector, byte_offset, byte_len);
+
+	if (ext2fs_block_dev_desc == NULL) {
+		printf ("** Invalid Block Device Descriptor (NULL)\n");
+		return (0);
+	}
+
+	if (byte_offset != 0) {
+		/* read first part which isn't aligned with start of sector */
+		if (ext2fs_block_dev_desc->
+		    block_read (ext2fs_block_dev_desc->dev,
+				part_info.start + sector, 1,
+				(unsigned long *) sec_buf) != 1) {
+			printf (" ** ext2fs_devread() read error **\n");
+			return (0);
+		}
+		memcpy (buf, sec_buf + byte_offset,
+			min (SECTOR_SIZE - byte_offset, byte_len));
+		buf += min (SECTOR_SIZE - byte_offset, byte_len);
+		byte_len -= min (SECTOR_SIZE - byte_offset, byte_len);
+		sector++;
+	}
+
+	/*  read sector aligned part */
+	block_len = byte_len & ~(SECTOR_SIZE - 1);
+	if (ext2fs_block_dev_desc->block_read (ext2fs_block_dev_desc->dev,
+					       part_info.start + sector,
+					       block_len / SECTOR_SIZE,
+					       (unsigned long *) buf) !=
+	    block_len / SECTOR_SIZE) {
+		printf (" ** ext2fs_devread() read error - block\n");
+		return (0);
+	}
+	buf += block_len;
+	byte_len -= block_len;
+	sector += block_len / SECTOR_SIZE;
+
+	if (byte_len != 0) {
+		/* read rest of data which are not in whole sector */
+		if (ext2fs_block_dev_desc->
+		    block_read (ext2fs_block_dev_desc->dev,
+				part_info.start + sector, 1,
+				(unsigned long *) sec_buf) != 1) {
+			printf (" ** ext2fs_devread() read error - last part\n");
+			return (0);
+		}
+		memcpy (buf, sec_buf, byte_len);
+	}
+	return (1);
+}
+#endif /* CFG_CMD_EXT2FS */
-- 
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