patches.axfs/axfs-axfs_fs.h.patch

From Aaditya.Kumar@ap.sony.com Fri Nov 23 03:34:37 2012
From: Aaditya Kumar <aaditya.kumar@ap.sony.com>
Date: Fri, 23 Nov 2012 16:58:55 +0530
Subject: [PATCH v2 RESEND 03/15] AXFS: axfs_fs.h
To: Greg KH <gregkh@linuxfoundation.org>
Cc: "ltsi-dev@lists.linuxfoundation.org" <ltsi-dev@lists.linuxfoundation.org>, tim.bird@am.sony.com, frank.rowand@am.sony.com, takuzo.ohara@ap.sony.com, amit.agarwal@ap.sony.com, kan.iibuchi@jp.sony.com, aaditya.kumar.30@gmail.com
Message-ID: <50AF5DF7.1040709@ap.sony.com>


From: Jared Hulbert <jaredeh@gmail.com>

The AXFS on media superblock declaration.

Signed-off-by: Jared Hulbert <jaredeh@gmail.com>
Signed-off-by: Aaditya Kumar <aaditya.kumar@ap.sony.com>
---
 include/linux/axfs_fs.h |  124 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
  create mode 100644 include/linux/axfs_fs.h

--- /dev/null
+++ b/include/linux/axfs_fs.h
@@ -0,0 +1,124 @@
+/*
+ * Advanced XIP File System for Linux - AXFS
+ *   Readonly, compressed, and XIP filesystem for Linux systems big and small
+ *
+ * Copyright(c) 2008 Numonyx
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * Authors:
+ *  Eric Anderson
+ *  Jared Hulbert <jaredeh@gmail.com>
+ *  Sujaya Srinivasan
+ *  Justin Treon
+ *
+ * Project url: http://axfs.sourceforge.net
+ */
+
+#ifndef AXFS_FS_H
+#define AXFS_FS_H
+
+#include <linux/axfs_fs_sb.h>
+
+#ifdef __KERNEL__
+#include <linux/rwsem.h>
+#endif
+#include <linux/errno.h>
+#include <linux/time.h>
+
+#include <linux/pagemap.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+
+#define AXFS_MAGIC	0x48A0E4CD	/* some random number */
+#define AXFS_SIGNATURE	"Advanced XIP FS"
+#define AXFS_MAXPATHLEN 255
+
+
+/* Uncompression interfaces to the underlying zlib */
+int axfs_uncompress_block(void *, int, void *, int);
+int axfs_uncompress_init(void);
+int axfs_uncompress_exit(void);
+
+struct axfs_profiling_data {
+	u64 inode_number;
+	unsigned long count;
+};
+
+enum axfs_node_types {
+	XIP = 0,
+	Compressed,
+	Byte_Aligned,
+};
+
+enum axfs_compression_types {
+	ZLIB = 0
+};
+
+/* on media struct describing a data region */
+struct axfs_region_desc_onmedia {
+	u64 fsoffset;
+	u64 size;
+	u64 compressed_size;
+	u64 max_index;
+	u8 table_byte_depth;
+	u8 incore;
+};
+
+/* on media format for the super block */
+struct axfs_super_onmedia {
+	__be32 magic;		/* 0x48A0E4CD - random number */
+	u8 signature[16];	/* "Advanced XIP FS" */
+	u8 digest[40];		/* sha1 digest for checking data integrity */
+	__be32 cblock_size;	/* maximum size of the block being compressed */
+	__be64 files;		/* number of inodes/files in fs */
+	__be64 size;		/* total image size */
+	__be64 blocks;		/* number of nodes in fs */
+	__be64 mmap_size;	/* size of the memory mapped part of image */
+	__be64 strings;		/* offset to strings region descriptor */
+	__be64 xip;		/* offset to xip region descriptor */
+	__be64 byte_aligned;	/* offset to the byte aligned region desc */
+	__be64 compressed;	/* offset to the compressed region desc */
+	__be64 node_type;	/* offset to node type region desc */
+	__be64 node_index;	/* offset to node index region desc */
+	__be64 cnode_offset;	/* offset to cnode offset region desc */
+	__be64 cnode_index;	/* offset to cnode index region desc */
+	__be64 banode_offset;	/* offset to banode offset region desc */
+	__be64 cblock_offset;	/* offset to cblock offset region desc */
+	__be64 inode_file_size;	/* offset to inode file size desc */
+	__be64 inode_name_offset;/* offset to inode num_entries region desc */
+	__be64 inode_num_entries;/* offset to inode num_entries region desc */
+	__be64 inode_mode_index;/* offset to inode mode index region desc */
+	__be64 inode_array_index;/* offset to inode node index region desc */
+	__be64 modes;		/* offset to mode mode region desc */
+	__be64 uids;		/* offset to mode uid index region desc */
+	__be64 gids;		/* offset to mode gid index region desc */
+	u8 version_major;
+	u8 version_minor;
+	u8 version_sub;
+	u8 compression_type;	/* Identifies type of compression used on FS */
+	__be64 timestamp;	/* UNIX time_t of filesystem build time */
+	u8 page_shift;
+};
+
+#define AXFS_SB(sb) ((struct axfs_super *)((sb)->s_fs_info))
+
+static inline u64 axfs_bytetable_stitch(u8 depth, u8 *table, u64 index)
+{
+	u64 i;
+	u64 output = 0;
+	u64 byte = 0;
+	u64 j;
+	u64 bits;
+
+	for (i = 0; i < depth; i++) {
+		j = index * depth + i;
+		bits = 8 * (depth - i - 1);
+		byte = table[j];
+		output += byte << bits;
+	}
+	return output;
+}
+#endif