[PATCH] Port SquashFS to 2.6 (take 2)

[junkio@cox.net]

This is the second round of the port.  I have fixed the following,
based on suggestions from the list, since the initial patch:

 - A couple of character buffers allocated on the stack in the
   original 2.4 code are allocated with kmalloc(GFP_KERNEL) now.

 - A bit more readable Kconfig help message has been added.

----------------------------------------------------------------

The following is a straight port of Phillip Lougher's SquashFS
(http://squashfs.sf.net).  The port is based on squashfs 1.2 for
2.4.20.

The patch is on top of, and tested with, 2.6.0-test1-ac2.  It
applies cleanly on vanilla 2.6.0-test1 (since -ac2 is mostly
bugfixes, there is not much point testing with vanilla, though).

There are four things that are different from the 2.4 version (is
there a "notes on porting filesystems from 2.4 to 2.6" document
somewhere, btw?):

 - Hooks in init/do_mounts.c to mount things in initramfs seems
   to have removed (there is no mention of CRAMFS there
   anymore), so that part of the patch has been removed.

 - 2.6 vfs calls dir_ops.readdir without BKL held, and expected
   to do that itself if needed.  The attached port mimics what
   cramfs/inode.c does differently between 2.4 and 2.6.

 - struct super_block in 2.6 vfs has removed the embedded union
   for filesystem private data.  Filesystems are expected to use
   void *s_fs_info member in it to hang private data in
   kmalloc'ed memory if needed.  The attached port again mimics
   what cramfs/inode.c does differently between 2.4 and 2.6.

 - struct inode in 2.6 vfs has removed the embedded union for
   filesystem private data.  Filesystems with private data now
   define its own xxx_inode_info struct that embeds struct
   inode.  IOW, containment has become inside out.  The attached
   port defines alloc_inode (and corresponding destroy_inode)
   members in the super_operations struct, mimicking what
   ext3/super.c does differently between 2.4 and 2.6.

----------------------------------------------------------------

 fs/Kconfig                     |   20 
 fs/Makefile                    |    1 
 fs/squashfs/Makefile           |    8 
 fs/squashfs/inode.c            | 1045 +++++++++++++++++++++++++++++++++++++++++
 include/linux/squashfs_fs.h    |  304 +++++++++++
 include/linux/squashfs_fs_sb.h |   41 +
 lib/Kconfig                    |    4 
 7 files changed, 1421 insertions(+), 2 deletions(-)

diff -Naur linux-2.6.0-test1-ac2/fs/Kconfig linux-2.6.0-test1-ac2-sfs/fs/Kconfig
--- linux-2.6.0-test1-ac2/fs/Kconfig	2003-07-10 13:10:54.000000000 -0700
+++ linux-2.6.0-test1-ac2-sfs/fs/Kconfig	2003-07-20 01:36:53.000000000 -0700
@@ -1114,6 +1114,26 @@
 
 	  If unsure, say N.
 
+config SQUASHFS
+	tristate "Squashfs file system support"
+	help
+	  Saying Y here includes support for Squashfs.  Squashfs is a
+	  highly compressed read-only filesystem for Linux. It uses zlib
+	  compression to compress both files, inodes and directories.
+	  Inodes in the system are very small and all blocks are packed
+	  to minimise data overhead. Block sizes greater than 4K are
+	  supported up to a maximum of 32K.
+
+	  See <http://squashfs.sourceforge.net/> for further information.
+
+	  If you want to compile this as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module
+	  will be called squashfs.  Note that the root file system (the one
+	  containing the directory /) cannot be compiled as a module.
+
+	  If unsure, say N.
+
 config VXFS_FS
 	tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
 	help
diff -Naur linux-2.6.0-test1-ac2/fs/Makefile linux-2.6.0-test1-ac2-sfs/fs/Makefile
--- linux-2.6.0-test1-ac2/fs/Makefile	2003-07-10 13:10:55.000000000 -0700
+++ linux-2.6.0-test1-ac2-sfs/fs/Makefile	2003-07-16 13:45:34.000000000 -0700
@@ -53,6 +53,7 @@
 obj-$(CONFIG_JBD)		+= jbd/
 obj-$(CONFIG_EXT2_FS)		+= ext2/
 obj-$(CONFIG_CRAMFS)		+= cramfs/
+obj-$(CONFIG_SQUASHFS)		+= squashfs/
 obj-$(CONFIG_RAMFS)		+= ramfs/
 obj-$(CONFIG_HUGETLBFS)		+= hugetlbfs/
 obj-$(CONFIG_CODA_FS)		+= coda/
diff -Naur linux-2.6.0-test1-ac2/fs/squashfs/Makefile linux-2.6.0-test1-ac2-sfs/fs/squashfs/Makefile
--- linux-2.6.0-test1-ac2/fs/squashfs/Makefile	1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.0-test1-ac2-sfs/fs/squashfs/Makefile	2003-07-15 12:17:43.000000000 -0700
@@ -0,0 +1,8 @@
+#
+# Makefile for the linux squashfs routines.
+#
+
+obj-$(CONFIG_SQUASHFS) += squashfs.o
+
+squashfs-objs := inode.o
+
diff -Naur linux-2.6.0-test1-ac2/fs/squashfs/inode.c linux-2.6.0-test1-ac2-sfs/fs/squashfs/inode.c
--- linux-2.6.0-test1-ac2/fs/squashfs/inode.c	1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.0-test1-ac2-sfs/fs/squashfs/inode.c	2003-07-20 02:08:01.000000000 -0700
@@ -0,0 +1,1045 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002 Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * 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.
+ *
+ * inode.c
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/dcache.h>
+#include <asm/uaccess.h>
+#include <linux/wait.h>
+#include <asm/semaphore.h>
+#include <linux/zlib.h>
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/vfs.h>
+
+#ifdef SQUASHFS_TRACE
+#define TRACE(s, args...)				printk(KERN_NOTICE "SQUASHFS: "s, ## args)
+#else
+#define TRACE(s, args...)				{}
+#endif
+
+#define ERROR(s, args...)				printk(KERN_ERR "SQUASHFS error: "s, ## args)
+
+#define SERROR(s, args...)				if(!silent) printk(KERN_ERR "SQUASHFS error: "s, ## args)
+#define WARNING(s, args...)				printk(KERN_WARNING "SQUASHFS: "s, ## args)
+
+typedef struct squashfs_inode_info {
+	unsigned int	start_block;
+	unsigned int	block_list_start;
+	unsigned int	offset;
+
+	struct inode	vfs_inode;
+} squashfs_inode_info;
+
+static inline struct squashfs_inode_info *SQUASH_I(struct inode *inode)
+{
+	return container_of(inode, struct squashfs_inode_info, vfs_inode);
+}
+
+static int squashfs_fill_super(struct super_block *, void *, int);
+static void squashfs_put_super(struct super_block *);
+static int squashfs_statfs(struct super_block *, struct kstatfs *);
+static int squashfs_symlink_readpage(struct file *file, struct page *page);
+static int squashfs_readpage(struct file *file, struct page *page);
+static int squashfs_readdir(struct file *, void *, filldir_t);
+static struct dentry *squashfs_lookup(struct inode *, struct dentry *, struct nameidata *);
+static unsigned int read_data(struct super_block *s, char *buffer,
+		unsigned int index, int length, unsigned int *next_index);
+static int squashfs_get_cached_block(struct super_block *s, char *buffer,
+		unsigned int block, unsigned int offset, int length,
+		unsigned int *next_block, unsigned int *next_offset);
+static struct inode *squashfs_iget(struct super_block *s, squashfs_inode inode);
+static void squashfs_put_super(struct super_block *s);
+static struct super_block *squashfs_get_sb(struct file_system_type *, int, const char *, void *);
+static struct inode *squashfs_alloc_inode(struct super_block *);
+static void squashfs_destroy_inode(struct inode *);
+
+DECLARE_MUTEX(read_data_mutex);
+
+static z_stream stream;
+
+static unsigned char squashfs_filetype_table[] = {
+	DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR
+};
+
+static struct super_operations squashfs_ops = {
+	.alloc_inode	= squashfs_alloc_inode,
+	.destroy_inode	= squashfs_destroy_inode,
+	.statfs		= squashfs_statfs,
+	.put_super	= squashfs_put_super,
+};
+
+static struct address_space_operations squashfs_symlink_aops = {
+	.readpage	= squashfs_symlink_readpage
+};
+
+static struct address_space_operations squashfs_aops = {
+	.readpage	= squashfs_readpage
+};
+
+static struct file_operations squashfs_dir_ops = {
+	.read		= generic_read_dir,
+	.readdir	= squashfs_readdir
+};
+
+static struct inode_operations squashfs_dir_inode_ops = {
+	.lookup		= squashfs_lookup
+};
+
+static struct file_system_type squashfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "squashfs",
+	.get_sb		= squashfs_get_sb,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+static unsigned int read_data(struct super_block *s, char *buffer,
+		unsigned int index, int length, unsigned int *next_index)
+{
+	squashfs_sb_info *msBlk = s->s_fs_info;
+	struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >> msBlk->devblksize_log2) + 2];
+	unsigned short c_byte;
+	unsigned int offset = index & ((1 << msBlk->devblksize_log2) - 1);
+	unsigned int cur_index = index >> msBlk->devblksize_log2;
+	int bytes, avail_bytes, b, k;
+	char *c_buffer;
+	unsigned int compressed;
+
+	if(!(bh[0] = sb_bread(s, cur_index)))
+		goto read_failure;
+
+	if(length)
+		c_byte = length;
+	else {
+		if(msBlk->devblksize - offset == 1) {
+			if(msBlk->swap)
+				((unsigned char *) &c_byte)[1] = *((unsigned char *) (bh[0]->b_data + offset));
+			else
+				((unsigned char *) &c_byte)[0] = *((unsigned char *) (bh[0]->b_data + offset));
+			brelse(bh[0]);
+			if(!(bh[0] = sb_bread(s, ++cur_index)))
+				goto read_failure;
+			if(msBlk->swap)
+				((unsigned char *) &c_byte)[0] = *((unsigned char *) bh[0]->b_data); 
+			else
+				((unsigned char *) &c_byte)[1] = *((unsigned char *) bh[0]->b_data); 
+			offset = 1;
+		}
+		else {
+			if(msBlk->swap) {
+				((unsigned char *) &c_byte)[1] = *((unsigned char *) (bh[0]->b_data + offset));
+				((unsigned char *) &c_byte)[0] = *((unsigned char *) (bh[0]->b_data + offset + 1)); 
+			} else
+				c_byte = *((unsigned short *) (bh[0]->b_data + offset));
+			offset += 2;
+		}
+		if(SQUASHFS_CHECK_DATA(msBlk->sBlk.flags)) {
+			if(offset == msBlk->devblksize) {
+				brelse(bh[0]);
+				if(!(bh[0] = sb_bread(s, ++cur_index)))
+					goto read_failure;
+				offset = 0;
+			}
+			if(*((unsigned char *) (bh[0]->b_data + offset)) != SQUASHFS_MARKER_BYTE) {
+				ERROR("Metadata block marker corrupt @ %x\n", index);
+				brelse(bh[0]);
+				return 0;
+			}
+			offset ++;
+		}
+	}
+
+	bytes = msBlk->devblksize - offset;
+	c_buffer = (compressed = SQUASHFS_COMPRESSED(c_byte)) ? msBlk->read_data : buffer;
+	c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
+
+	TRACE("Block @ 0x%x, %scompressed size %d\n", index, compressed ? "" : "un", (unsigned int) c_byte);
+
+	for(b = 1; bytes < c_byte; b++) {
+		if(!(bh[b] = sb_bread(s, ++cur_index)))
+			goto block_release;
+		bytes += msBlk->devblksize;
+	}
+
+	if(compressed)
+		down(&read_data_mutex);
+
+	for(bytes = 0, k = 0; k < b; k++) {
+		avail_bytes = (c_byte - bytes) > (msBlk->devblksize - offset) ? msBlk->devblksize - offset : c_byte - bytes;
+		memcpy(c_buffer + bytes, bh[k]->b_data + offset, avail_bytes);
+		bytes += avail_bytes;
+		offset = 0;
+		brelse(bh[k]);
+	}
+
+	/*
+	 * uncompress block
+	 */
+	if(compressed) {
+		int zlib_err;
+
+		stream.next_in = c_buffer;
+		stream.avail_in = c_byte;
+		stream.next_out = buffer;
+		stream.avail_out = msBlk->read_size;
+		if(((zlib_err = zlib_inflateInit(&stream)) != Z_OK) ||
+				((zlib_err = zlib_inflate(&stream, Z_FINISH)) != Z_STREAM_END) ||
+				((zlib_err = zlib_inflateEnd(&stream)) != Z_OK)) {
+			ERROR("zlib_fs returned unexpected result 0x%x\n", zlib_err);
+			bytes = 0;
+		} else
+			bytes = stream.total_out;
+		up(&read_data_mutex);
+	}
+
+	if(next_index)
+		*next_index = index + c_byte + (length ? 0 : (SQUASHFS_CHECK_DATA(msBlk->sBlk.flags) ? 3 : 2));
+
+	return bytes;
+
+block_release:
+	while(--b >= 0) brelse(bh[b]);
+
+read_failure:
+	ERROR("sb_bread failed reading block 0x%x\n", cur_index);
+	return 0;
+}
+
+
+static int squashfs_get_cached_block(struct super_block *s, char *buffer,
+		unsigned int block, unsigned int offset, int length,
+		unsigned int *next_block, unsigned int *next_offset)
+{
+	squashfs_sb_info *msBlk = s->s_fs_info;
+	int n, i, bytes, return_length = length;
+	unsigned int next_index;
+
+	TRACE("Entered squashfs_get_cached_block [%x:%x]\n", block, offset);
+
+	for(;;) {
+		for(i = 0; i < SQUASHFS_CACHED_BLKS; i++) 
+			if(msBlk->block_cache[i].block == block)
+				break; 
+		
+		down(&msBlk->block_cache_mutex);
+		if(i == SQUASHFS_CACHED_BLKS) {
+			/* read inode header block */
+			for(i = msBlk->next_cache, n = SQUASHFS_CACHED_BLKS; n ; n --, i = (i + 1) % SQUASHFS_CACHED_BLKS)
+				if(msBlk->block_cache[i].block != SQUASHFS_USED_BLK)
+					break;
+			if(n == 0) {
+				up(&msBlk->block_cache_mutex);
+				sleep_on(&msBlk->waitq);
+				continue;
+			}
+			msBlk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
+
+			if(msBlk->block_cache[i].block == SQUASHFS_INVALID_BLK) {
+				if(!(msBlk->block_cache[i].data = (unsigned char *)
+							kmalloc(SQUASHFS_METADATA_SIZE, GFP_KERNEL))) {
+					ERROR("Failed to allocate cache block\n");
+					up(&msBlk->block_cache_mutex);
+					return 0;
+				}
+			}
+	
+			msBlk->block_cache[i].block = SQUASHFS_USED_BLK;
+			up(&msBlk->block_cache_mutex);
+			if(!(msBlk->block_cache[i].length = read_data(s, msBlk->block_cache[i].data, block, 0,
+							&next_index))) {
+				ERROR("Unable to read cache block [%x:%x]\n", block, offset);
+				return 0;
+			}
+			down(&msBlk->block_cache_mutex);
+			wake_up(&msBlk->waitq);
+			msBlk->block_cache[i].block = block;
+			msBlk->block_cache[i].next_index = next_index;
+			TRACE("Read cache block [%x:%x]\n", block, offset);
+		}
+
+		if(msBlk->block_cache[i].block != block) {
+			up(&msBlk->block_cache_mutex);
+			continue;
+		}
+
+		if((bytes = msBlk->block_cache[i].length - offset) >= length) {
+			memcpy(buffer, msBlk->block_cache[i].data + offset, length);
+			if(msBlk->block_cache[i].length - offset == length) {
+				*next_block = msBlk->block_cache[i].next_index;
+				*next_offset = 0;
+			} else {
+				*next_block = block;
+				*next_offset = offset + length;
+			}
+	
+			up(&msBlk->block_cache_mutex);
+			return return_length;
+		} else {
+			memcpy(buffer, msBlk->block_cache[i].data + offset, bytes);
+			block = msBlk->block_cache[i].next_index;
+			up(&msBlk->block_cache_mutex);
+			length -= bytes;
+			offset = 0;
+			buffer += bytes;
+		}
+	}
+}
+
+
+static struct inode *squashfs_iget(struct super_block *s, squashfs_inode inode)
+{
+	struct inode *i = new_inode(s);
+	struct squashfs_inode_info *sqi = SQUASH_I(i);
+	squashfs_sb_info *msBlk = s->s_fs_info;
+	squashfs_super_block *sBlk = &msBlk->sBlk;
+	unsigned int block = SQUASHFS_INODE_BLK(inode) + sBlk->inode_table_start;
+	unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
+	unsigned int next_block, next_offset;
+	squashfs_base_inode_header inodeb;
+
+	TRACE("Entered squashfs_iget\n");
+
+	if(msBlk->swap) {
+		squashfs_base_inode_header sinodeb;
+
+		if(!squashfs_get_cached_block(s, (char *) &sinodeb, block,  offset,
+					sizeof(sinodeb), &next_block, &next_offset))
+			goto failed_read;
+		SQUASHFS_SWAP_BASE_INODE_HEADER(&inodeb, &sinodeb, sizeof(sinodeb));
+	} else
+		if(!squashfs_get_cached_block(s, (char *) &inodeb, block,  offset,
+					sizeof(inodeb), &next_block, &next_offset))
+			goto failed_read;
+
+	i->i_nlink = 1;
+
+	i->i_mtime.tv_sec = sBlk->mkfs_time;
+	i->i_atime.tv_sec = sBlk->mkfs_time;
+	i->i_ctime.tv_sec = sBlk->mkfs_time;
+	i->i_mtime.tv_nsec = i->i_atime.tv_nsec = i->i_ctime.tv_nsec = 0;
+	i->i_uid = msBlk->uid[((inodeb.inode_type - 1) / SQUASHFS_TYPES) * 16 + inodeb.uid];
+	i->i_ino = SQUASHFS_MK_VFS_INODE(block - sBlk->inode_table_start, offset);
+
+	if(inodeb.guid == SQUASHFS_GUIDS)
+		i->i_gid = i->i_uid;
+	else
+		i->i_gid = msBlk->guid[inodeb.guid];
+
+	i->i_mode = inodeb.mode;
+
+	switch((inodeb.inode_type - 1) % SQUASHFS_TYPES + 1) {
+		case SQUASHFS_FILE_TYPE: {
+			squashfs_reg_inode_header inodep;
+
+			if(msBlk->swap) {
+				squashfs_reg_inode_header sinodep;
+
+				if(!squashfs_get_cached_block(s, (char *) &sinodep, block,  offset, sizeof(sinodep),
+							&next_block, &next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_REG_INODE_HEADER(&inodep, &sinodep);
+			} else
+				if(!squashfs_get_cached_block(s, (char *) &inodep, block,  offset, sizeof(inodep),
+							&next_block, &next_offset))
+					goto failed_read;
+
+			i->i_size = inodep.file_size;
+			i->i_fop = &generic_ro_fops;
+			i->i_data.a_ops = &squashfs_aops;
+			i->i_mode |= S_IFREG;
+
+			i->i_mtime.tv_sec = inodep.mtime;
+			i->i_atime.tv_sec = inodep.mtime;
+			i->i_ctime.tv_sec = inodep.mtime;
+			i->i_mtime.tv_nsec = i->i_atime.tv_nsec =
+				i->i_ctime.tv_nsec = 0;
+			sqi->start_block = inodep.start_block;
+			sqi->block_list_start = next_block;
+			sqi->offset = next_offset;
+			TRACE("File inode %x:%x, start_block %x, block_list_start %x, offset %x\n",
+					SQUASHFS_INODE_BLK(inode), offset, inodep.start_block, next_block, next_offset);
+			break;
+		}
+		case SQUASHFS_DIR_TYPE: {
+			squashfs_dir_inode_header inodep;
+
+			if(msBlk->swap) {
+				squashfs_dir_inode_header sinodep;
+
+				if(!squashfs_get_cached_block(s, (char *) &sinodep, block,  offset, sizeof(sinodep),
+							&next_block, &next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_DIR_INODE_HEADER(&inodep, &sinodep);
+			} else
+				if(!squashfs_get_cached_block(s, (char *) &inodep, block,  offset, sizeof(inodep),
+							&next_block, &next_offset))
+					goto failed_read;
+
+			i->i_size = inodep.file_size;
+			i->i_op = &squashfs_dir_inode_ops;
+			i->i_fop = &squashfs_dir_ops;
+			i->i_mode |= S_IFDIR;
+			i->i_mtime.tv_sec = inodep.mtime;
+			i->i_atime.tv_sec = inodep.mtime;
+			i->i_ctime.tv_sec = inodep.mtime;
+			i->i_mtime.tv_nsec = i->i_atime.tv_nsec =
+				i->i_ctime.tv_nsec = 0;
+			sqi->start_block = inodep.start_block;
+			sqi->offset = inodep.offset;
+			TRACE("Directory inode %x:%x, start_block %x, offset %x\n", SQUASHFS_INODE_BLK(inode), offset,
+					inodep.start_block, inodep.offset);
+			break;
+		}
+		case SQUASHFS_SYMLINK_TYPE: {
+			squashfs_symlink_inode_header inodep;
+	
+			if(msBlk->swap) {
+				squashfs_symlink_inode_header sinodep;
+
+				if(!squashfs_get_cached_block(s, (char *) &sinodep, block,  offset, sizeof(sinodep),
+							&next_block, &next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_SYMLINK_INODE_HEADER(&inodep, &sinodep);
+			} else
+				if(!squashfs_get_cached_block(s, (char *) &inodep, block,  offset, sizeof(inodep),
+							&next_block, &next_offset))
+					goto failed_read;
+
+			i->i_size = inodep.symlink_size;
+			i->i_op = &page_symlink_inode_operations;
+			i->i_data.a_ops = &squashfs_symlink_aops;
+			i->i_mode |= S_IFLNK;
+			sqi->start_block = next_block;
+			sqi->offset = next_offset;
+			TRACE("Symbolic link inode %x:%x, start_block %x, offset %x\n",
+				SQUASHFS_INODE_BLK(inode), offset, next_block, next_offset);
+			break;
+		 }
+		 case SQUASHFS_BLKDEV_TYPE:
+		 case SQUASHFS_CHRDEV_TYPE: {
+			squashfs_dev_inode_header inodep;
+
+			if(msBlk->swap) {
+				squashfs_dev_inode_header sinodep;
+
+				if(!squashfs_get_cached_block(s, (char *) &sinodep, block,  offset, sizeof(sinodep),
+							&next_block, &next_offset))
+					goto failed_read;
+				SQUASHFS_SWAP_DEV_INODE_HEADER(&inodep, &sinodep);
+			} else	
+				if(!squashfs_get_cached_block(s, (char *) &inodep, block,  offset, sizeof(inodep),
+							&next_block, &next_offset))
+					goto failed_read;
+
+			i->i_size = 0;
+			i->i_mode |= (inodeb.inode_type == SQUASHFS_CHRDEV_TYPE) ? S_IFCHR : S_IFBLK;
+			init_special_inode(i, i->i_mode, inodep.rdev);
+			TRACE("Device inode %x:%x, rdev %x\n", SQUASHFS_INODE_BLK(inode), offset, inodep.rdev);
+			break;
+		 }
+		 default:
+			ERROR("Unknown inode type %d in squashfs_iget!\n", inodeb.inode_type);
+				goto failed_read1;
+	}
+	
+	return i;
+
+failed_read:
+	ERROR("Unable to read inode [%x:%x]\n", block, offset);
+
+failed_read1:
+	return NULL;
+}
+
+
+static int squashfs_fill_super(struct super_block *s, void *data, int silent)
+{
+	char bbuf[BDEVNAME_SIZE];
+	squashfs_sb_info *msBlk;
+	squashfs_super_block *sBlk;
+	int i;
+
+	TRACE("Entered squashfs_fill_super\n");
+
+	msBlk = kmalloc(sizeof(squashfs_sb_info), GFP_KERNEL);
+	if (!msBlk)
+		return -ENOMEM;
+	s->s_fs_info = msBlk;
+	sBlk = &(msBlk->sBlk);
+	memset(msBlk, 0, sizeof(squashfs_sb_info));
+
+	msBlk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
+	msBlk->devblksize_log2 = ffz(~msBlk->devblksize);
+
+	init_MUTEX(&msBlk->read_page_mutex);
+	init_MUTEX(&msBlk->block_cache_mutex);
+	
+	init_waitqueue_head(&msBlk->waitq);
+
+	if(!read_data(s, (char *) sBlk, SQUASHFS_START, sizeof(squashfs_super_block) | SQUASHFS_COMPRESSED_BIT, NULL)) {
+		SERROR("unable to read superblock\n");
+		goto failed_mount;
+	}
+
+	/* Check it is a SQUASHFS superblock */
+	msBlk->swap = 0;
+	if((s->s_magic = sBlk->s_magic) != SQUASHFS_MAGIC) {
+		if(sBlk->s_magic == SQUASHFS_MAGIC_SWAP) {
+			squashfs_super_block sblk;
+			WARNING("Mounting a different endian SQUASHFS filesystem on %s\n", __bdevname(s->s_dev, bbuf));
+			SQUASHFS_SWAP_SUPER_BLOCK(&sblk, sBlk);
+			memcpy(sBlk, &sblk, sizeof(squashfs_super_block));
+			msBlk->swap = 1;
+		} else  {
+			SERROR("Can't find a SQUASHFS superblock on %s\n", __bdevname(s->s_dev, bbuf));
+			goto failed_mount;
+		}
+	}
+
+	/* Check the MAJOR & MINOR versions */
+	if(sBlk->s_major != SQUASHFS_MAJOR || sBlk->s_minor > SQUASHFS_MINOR) {
+		SERROR("Major/Minor mismatch, filesystem is (%d:%d), I support (%d: <= %d)\n",
+				sBlk->s_major, sBlk->s_minor, SQUASHFS_MAJOR, SQUASHFS_MINOR);
+		goto failed_mount;
+	}
+
+	TRACE("Found valid superblock on %s\n", __bdevname(s->s_dev, bbuf));
+	TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(sBlk->flags) ? "un" : "");
+	TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(sBlk->flags) ? "un" : "");
+	TRACE("Check data is %s present in the filesystem\n", SQUASHFS_CHECK_DATA(sBlk->flags) ? "" : "not");
+	TRACE("Filesystem size %d bytes\n", sBlk->bytes_used);
+	TRACE("Block size %d\n", sBlk->block_size);
+	TRACE("Number of inodes %d\n", sBlk->inodes);
+	TRACE("Number of uids %d\n", sBlk->no_uids);
+	TRACE("Number of gids %d\n", sBlk->no_guids);
+	TRACE("sBlk->inode_table_start %x\n", sBlk->inode_table_start);
+	TRACE("sBlk->directory_table_start %x\n", sBlk->directory_table_start);
+	TRACE("sBlk->uid_start %x\n", sBlk->uid_start);
+
+	s->s_flags |= MS_RDONLY;
+	s->s_op = &squashfs_ops;
+
+	/* Init inode_table block pointer array */
+	if(!(msBlk->block_cache = (squashfs_cache *) kmalloc(sizeof(squashfs_cache) * SQUASHFS_CACHED_BLKS, GFP_KERNEL))) {
+		ERROR("Failed to allocate block cache\n");
+		goto failed_mount;
+	}
+
+	for(i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+		msBlk->block_cache[i].block = SQUASHFS_INVALID_BLK;
+
+	msBlk->next_cache = 0;
+
+	/* Allocate read_data block */
+	msBlk->read_size = (sBlk->block_size < SQUASHFS_METADATA_SIZE) ? SQUASHFS_METADATA_SIZE : sBlk->block_size;
+	if(!(msBlk->read_data = (char *) kmalloc(msBlk->read_size, GFP_KERNEL))) {
+		ERROR("Failed to allocate read_data block\n");
+		goto failed_mount1;
+	}
+
+	/* Allocate read_page block */
+	if(sBlk->block_size > PAGE_CACHE_SIZE && 
+	   !(msBlk->read_page = (char *) kmalloc(sBlk->block_size, GFP_KERNEL))) {
+		ERROR("Failed to allocate read_page block\n");
+		goto failed_mount2;
+	}
+
+	/* Allocate uid and gid tables */
+	if(!(msBlk->uid = (squashfs_uid *) kmalloc((sBlk->no_uids +
+		sBlk->no_guids) * sizeof(squashfs_uid), GFP_KERNEL))) {
+		ERROR("Failed to allocate uid/gid table\n");
+		goto failed_mount3;
+	}
+	msBlk->guid = msBlk->uid + sBlk->no_uids;
+   
+	if(msBlk->swap) {
+		squashfs_uid suid[sBlk->no_uids + sBlk->no_guids];
+
+		if(!read_data(s, (char *) &suid, sBlk->uid_start, ((sBlk->no_uids + sBlk->no_guids) *
+				sizeof(squashfs_uid)) | SQUASHFS_COMPRESSED_BIT, NULL)) {
+			SERROR("unable to read uid/gid table\n");
+			goto failed_mount4;
+		}
+		SQUASHFS_SWAP_DATA(msBlk->uid, suid, (sBlk->no_uids + sBlk->no_guids), (sizeof(squashfs_uid) * 8));
+	} else
+		if(!read_data(s, (char *) msBlk->uid, sBlk->uid_start, ((sBlk->no_uids + sBlk->no_guids) *
+				sizeof(squashfs_uid)) | SQUASHFS_COMPRESSED_BIT, NULL)) {
+			SERROR("unable to read uid/gid table\n");
+			goto failed_mount4;
+		}
+
+	if(!(s->s_root = d_alloc_root(squashfs_iget(s, sBlk->root_inode)))) {
+		ERROR("Root inode create failed\n");
+		goto failed_mount4;
+	}
+
+	TRACE("Leaving squashfs_fill_super\n");
+	return 0;
+
+failed_mount4:
+	kfree(msBlk->uid);
+failed_mount3:
+	kfree(msBlk->read_page);
+failed_mount2:
+	kfree(msBlk->read_data);
+failed_mount1:
+	kfree(msBlk->block_cache);
+failed_mount:
+	kfree(msBlk);
+	s->s_fs_info = NULL;
+	return -EINVAL;
+}
+
+
+static int squashfs_statfs(struct super_block *s, struct kstatfs *buf)
+{
+	squashfs_super_block *sBlk = &((squashfs_sb_info*)(s->s_fs_info))->sBlk;
+
+	TRACE("Entered squashfs_statfs\n");
+	buf->f_type = SQUASHFS_MAGIC;
+	buf->f_bsize = sBlk->block_size;
+	buf->f_blocks = ((sBlk->bytes_used - 1) >> sBlk->block_log) + 1;
+	buf->f_bfree = buf->f_bavail = 0;
+	buf->f_files = sBlk->inodes;
+	buf->f_ffree = 0;
+	buf->f_namelen = SQUASHFS_NAME_LEN;
+	return 0;
+}
+
+
+static int squashfs_symlink_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	struct squashfs_inode_info *sqi = SQUASH_I(inode);
+	int index = page->index << PAGE_CACHE_SHIFT, length = 0, bytes;
+	int block = sqi->start_block;
+	int offset = sqi->offset;
+	char *buffer;
+
+	TRACE("Entered squashfs_symlink_readpage, page index %d, start block %x, offset %x\n",
+		page->index, sqi->start_block, sqi->offset);
+
+	if (! (buffer = kmalloc(PAGE_CACHE_SIZE, GFP_KERNEL))) {
+		ERROR("Failed to allocate symblic link buffer\n");
+		return 0;
+	}
+
+	while(length < index) {
+		if(length += bytes = squashfs_get_cached_block(inode->i_sb, buffer, block, offset,
+					PAGE_CACHE_SIZE, &block, &offset), !bytes) {
+			ERROR("Unable to read symbolic link [%x:%x]\n", block, offset);
+			goto skip_read;
+		}
+	}
+
+	if(length != index) {
+		ERROR("(squashfs_symlink_readpage) length != index\n");
+		kfree(buffer);
+		return 0;
+	}
+
+	bytes = (inode->i_size - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE : inode->i_size - length;
+	if(!squashfs_get_cached_block(inode->i_sb, page_address(page), block, offset, bytes, &block, &offset))
+		ERROR("Unable to read symbolic link [%x:%x]\n", block, offset);
+
+skip_read:
+	kfree(buffer);
+	memset(page_address(page) + bytes, 0, PAGE_CACHE_SIZE - bytes);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	unlock_page(page);
+
+	return 0;
+}
+
+
+#define SIZE 1024
+static int squashfs_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	struct squashfs_inode_info *sqi = SQUASH_I(inode);
+	squashfs_sb_info *msBlk = inode->i_sb->s_fs_info;
+	squashfs_super_block *sBlk = &msBlk->sBlk;
+	unsigned short *block_listp;
+	int index = sBlk->block_log > PAGE_CACHE_SHIFT ?
+		page->index >> (sBlk->block_log - PAGE_CACHE_SHIFT) :
+		page->index << (PAGE_CACHE_SHIFT - sBlk->block_log);
+	int block = sqi->start_block, i = 0;
+	int bytes = sqi->block_list_start;
+	int offset = sqi->offset;
+	int file_blocks = ((inode->i_size - 1) >> sBlk->block_log) + 1;
+	char *block_list;
+	char *sblock_list;
+	
+	TRACE("Entered squashfs_readpage, page index %d, start block %x\n", page->index,
+		sqi->start_block);
+
+	if (msBlk->swap) {
+		block_list = kmalloc(SIZE, GFP_KERNEL);
+		sblock_list = kmalloc(SIZE, GFP_KERNEL);
+		if (! (block_list && sblock_list)) {
+			ERROR("Unable to allocate readpage buffer\n");
+			goto skip_read;
+		}
+	}
+	else {
+		sblock_list = 0;
+		if (! (block_list = kmalloc(SIZE, GFP_KERNEL))) {
+			ERROR("Unable to allocate readpage buffer\n");
+			goto skip_read;
+		}
+	}
+
+	if(index > file_blocks)
+		goto skip_read;
+
+	for(;;) {
+		int blocks = (index + 1 - i) > (SIZE >> 1) ? SIZE >> 1 : (index + 1 - i);
+		if(msBlk->swap) {
+			if(!squashfs_get_cached_block(inode->i_sb, sblock_list, bytes, offset, blocks << 1, &bytes, &offset)) {
+				ERROR("Unable to read block list [%d:%x]\n", bytes, offset);
+				goto skip_read;
+			}
+			SQUASHFS_SWAP_SHORTS(((unsigned short *)block_list), ((unsigned short *)sblock_list), blocks);
+		} else
+			if(!squashfs_get_cached_block(inode->i_sb, block_list, bytes, offset, blocks << 1, &bytes, &offset)) {
+				ERROR("Unable to read block list [%d:%x]\n", bytes, offset);
+				goto skip_read;
+			}
+		for(block_listp = (unsigned short *) block_list; i < index && blocks; i ++, block_listp ++, blocks --)
+			block += SQUASHFS_COMPRESSED_SIZE(*block_listp);
+		if(blocks)
+			break;
+	}
+
+	if(sBlk->block_log > PAGE_CACHE_SHIFT) {
+		int mask = (1 << (sBlk->block_log - PAGE_CACHE_SHIFT)) - 1;
+		int start_index = page->index & ~mask;
+		int end_index = start_index | mask;
+		int byte_offset = 0;
+
+		down(&msBlk->read_page_mutex);
+		if(!(bytes = read_data(inode->i_sb, msBlk->read_page, block, *block_listp, NULL))) {
+			ERROR("Unable to read page, block %x, size %x\n", block, (int) *block_listp);
+			goto skip_read;
+		}
+
+		for(i = start_index; i <= end_index && byte_offset < bytes; i++, byte_offset += PAGE_CACHE_SIZE) {
+			int available_bytes = (bytes - byte_offset) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE : bytes - byte_offset;
+
+			TRACE("bytes %d, i %d, byte_offset %d, available_bytes %d\n", bytes, i, byte_offset, available_bytes);
+
+			if(i == page->index)  {
+				memcpy(page_address(page), msBlk->read_page + byte_offset, available_bytes);
+				memset(page_address(page) + available_bytes, 0, PAGE_CACHE_SIZE - available_bytes);
+				flush_dcache_page(page);
+				SetPageUptodate(page);
+				unlock_page(page);
+			}  else {
+				struct page *push_page;
+
+				if((push_page = grab_cache_page_nowait(page->mapping, i))) {
+					memcpy(page_address(push_page), msBlk->read_page + byte_offset, available_bytes);
+					memset(page_address(push_page) + available_bytes, 0, PAGE_CACHE_SIZE - available_bytes);
+					flush_dcache_page(push_page);
+					SetPageUptodate(push_page);
+					unlock_page(push_page);
+					page_cache_release(push_page);
+				}
+			}
+		}
+		up( &msBlk->read_page_mutex);
+		kfree(block_list);
+		kfree(sblock_list);
+		return 0;
+
+	} else if(sBlk->block_log == PAGE_CACHE_SHIFT) {
+		if(!(bytes = read_data(inode->i_sb, page_address(page), block, *block_listp, NULL)))
+			ERROR("Unable to read page, block %x, size %x\n", block, (int) *block_listp);
+
+	} else {
+		int i_end = index + (1 << (PAGE_CACHE_SHIFT - sBlk->block_log));
+		char *p = (char *) page_address(page);
+		int byte;
+
+		if(i_end > file_blocks)
+			i_end = file_blocks;
+
+		while(index < i_end) {
+			if(!(byte = read_data(inode->i_sb, p, block, *block_listp, NULL))) {
+				ERROR("Unable to read page, block %x, size %x\n", block, (int) *block_listp);
+				goto skip_read;
+			}
+			block += SQUASHFS_COMPRESSED_SIZE(*block_listp);
+			p += byte;
+			bytes += byte;
+			index ++;
+			block_listp ++;
+		}
+	}
+
+skip_read:
+	kfree(block_list);
+	kfree(sblock_list);
+	memset(page_address(page) + bytes, 0, PAGE_CACHE_SIZE - bytes);
+	flush_dcache_page(page);
+	SetPageUptodate(page);
+	unlock_page(page);
+
+	return 0;
+}
+
+
+static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+	struct inode *i = file->f_dentry->d_inode;
+	struct squashfs_inode_info *sqi = SQUASH_I(i);
+	squashfs_sb_info *msBlk = i->i_sb->s_fs_info;
+	squashfs_super_block *sBlk = &msBlk->sBlk;
+	int next_block = sqi->start_block + sBlk->directory_table_start, next_offset =
+		sqi->offset, length = 0, dirs_read = 0, dir_count, bytes;
+	squashfs_dir_header dirh;
+	char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
+	squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer;
+
+	TRACE("Entered squashfs_readdir [%x:%x]\n", next_block, next_offset);
+
+	lock_kernel();
+
+	while(length < i->i_size) {
+		/* read directory header */
+		if(msBlk->swap) {
+			squashfs_dir_header sdirh;
+			if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) &sdirh, next_block,
+						next_offset, sizeof(sdirh), &next_block, &next_offset), !bytes)
+				goto failed_read;
+			SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+		} else
+			if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) &dirh, next_block,
+						next_offset, sizeof(dirh), &next_block, &next_offset), !bytes)
+				goto failed_read;
+
+		dir_count = dirh.count + 1;
+		while(dir_count--) {
+			if(msBlk->swap) {
+				squashfs_dir_entry sdire;
+				if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) &sdire, next_block,
+							next_offset, sizeof(sdire), &next_block, &next_offset), !bytes)
+					goto failed_read;
+				SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+			} else
+				if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) dire, next_block,
+							next_offset, sizeof(*dire), &next_block, &next_offset), !bytes)
+					goto failed_read;
+
+			if(length += bytes = squashfs_get_cached_block(i->i_sb, dire->name, next_block,
+						next_offset, dire->size + 1, &next_block, &next_offset), !bytes)
+				goto failed_read;
+
+			if(file->f_pos >= length)
+				continue;
+
+			dire->name[dire->size + 1] = '\0';
+
+			TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n", dirent,
+			dire->name, dire->size + 1, (int) file->f_pos,
+			dirh.start_block, dire->offset, squashfs_filetype_table[dire->type]);
+
+			if(filldir(dirent, dire->name, dire->size + 1, file->f_pos, SQUASHFS_MK_VFS_INODE(dirh.start_block,
+							dire->offset), squashfs_filetype_table[dire->type]) < 0) {
+				TRACE("Filldir returned less than 0\n");
+				unlock_kernel();
+				return dirs_read;
+			}
+
+			file->f_pos = length;
+			dirs_read ++;
+		}
+	}
+	unlock_kernel();
+	return dirs_read;
+
+failed_read:
+	ERROR("Unable to read directory block [%x:%x]\n", next_block, next_offset);
+	unlock_kernel();
+	return 0;
+}
+
+
+static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry,
+				      struct nameidata *nd)
+{
+	const char *name =dentry->d_name.name;
+	int len = dentry->d_name.len;
+	struct inode *inode = NULL;
+	struct squashfs_inode_info *sqi = SQUASH_I(i);
+	squashfs_sb_info *msBlk = i->i_sb->s_fs_info;
+	squashfs_super_block *sBlk = &msBlk->sBlk;
+	int next_block = sqi->start_block + sBlk->directory_table_start, next_offset =
+		sqi->offset, length = 0, dir_count, bytes;
+	squashfs_dir_header dirh;
+	char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN];
+	squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer;
+
+	TRACE("Entered squashfs_lookup [%x:%x]\n", next_block, next_offset);
+
+	while(length < i->i_size) {
+		/* read directory header */
+		if(msBlk->swap) {
+			squashfs_dir_header sdirh;
+			if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) &sdirh, next_block, next_offset,
+						sizeof(sdirh), &next_block, &next_offset), !bytes)
+				goto failed_read;
+			SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+		} else
+			if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) &dirh, next_block, next_offset,
+						sizeof(dirh), &next_block, &next_offset), !bytes)
+				goto failed_read;
+
+		dir_count = dirh.count + 1;
+		while(dir_count--) {
+			if(msBlk->swap) {
+				squashfs_dir_entry sdire;
+				if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) &sdire,
+							next_block,next_offset, sizeof(sdire), &next_block, &next_offset), !bytes)
+					goto failed_read;
+				SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+			} else
+				if(length += bytes = squashfs_get_cached_block(i->i_sb, (char *) dire,
+							next_block,next_offset, sizeof(*dire), &next_block, &next_offset), !bytes)
+					goto failed_read;
+
+			if(length += bytes = squashfs_get_cached_block(i->i_sb, dire->name,
+						next_block, next_offset, dire->size + 1, &next_block, &next_offset), !bytes)
+				goto failed_read;
+
+			if((len == dire->size + 1) && !strncmp(name, dire->name, len)) {
+				squashfs_inode ino = SQUASHFS_MKINODE(dirh.start_block, dire->offset);
+
+				TRACE("calling squashfs_iget for directory entry %s, inode %x:%x\n",
+						name, dirh.start_block, dire->offset);
+
+				inode = squashfs_iget(i->i_sb, ino);
+
+				goto exit_loop;
+			}
+		}
+	}
+
+exit_loop:
+	d_add(dentry, inode);
+	return ERR_PTR(0);
+
+failed_read:
+	ERROR("Unable to read directory block [%x:%x]\n", next_block, next_offset);
+	goto exit_loop;
+}
+
+
+static void squashfs_put_super(struct super_block *s)
+{
+	squashfs_sb_info *msBlk = s->s_fs_info;
+	kfree(msBlk->block_cache);
+	kfree(msBlk->read_data);
+	kfree(msBlk->read_page);
+	kfree(msBlk->uid);
+	kfree(msBlk);
+	s->s_fs_info = NULL;
+}
+
+static struct super_block *squashfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_bdev(fs_type, flags, dev_name, data,
+			   squashfs_fill_super);
+}
+
+static kmem_cache_t * squashfs_inode_cachep;
+
+static struct inode *squashfs_alloc_inode(struct super_block *sb)
+{
+	struct squashfs_inode_info *ii;
+	ii = (struct squashfs_inode_info *)
+		kmem_cache_alloc(squashfs_inode_cachep, SLAB_KERNEL);
+	if (!ii)
+		return NULL;
+	ii->vfs_inode.i_version = 1;
+	return &ii->vfs_inode;
+}
+
+static void squashfs_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(squashfs_inode_cachep, SQUASH_I(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct squashfs_inode_info *sqi = (struct squashfs_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR) {
+		inode_init_once(&sqi->vfs_inode);
+	}
+}
+
+static int init_inodecache(void)
+{
+	squashfs_inode_cachep =
+		kmem_cache_create("squashfs_inode_cache",
+				  sizeof(struct squashfs_inode_info),
+				  0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
+				  init_once, NULL);
+	if (squashfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	kmem_cache_destroy(squashfs_inode_cachep);
+}
+
+static int __init init_squashfs_fs(void)
+{
+
+	if(!(stream.workspace = (char *) vmalloc(zlib_inflate_workspacesize()))) {
+		ERROR("Failed to allocate zlib workspace\n");
+		return -ENOMEM;
+	}
+	if (init_inodecache())
+		return -ENOMEM;
+	return register_filesystem(&squashfs_fs_type);
+}
+
+
+static void __exit exit_squashfs_fs(void)
+{
+	destroy_inodecache();
+	vfree(stream.workspace);
+	unregister_filesystem(&squashfs_fs_type);
+}
+
+
+module_init(init_squashfs_fs);
+module_exit(exit_squashfs_fs);
+MODULE_DESCRIPTION("squashfs, a compressed read-only filesystem");
+MODULE_AUTHOR("Phillip Lougher <phillip@lougher.demon.co.uk>");
+MODULE_LICENSE("GPL");
diff -Naur linux-2.6.0-test1-ac2/include/linux/squashfs_fs.h linux-2.6.0-test1-ac2-sfs/include/linux/squashfs_fs.h
--- linux-2.6.0-test1-ac2/include/linux/squashfs_fs.h	1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.0-test1-ac2-sfs/include/linux/squashfs_fs.h	2003-07-18 16:12:47.000000000 -0700
@@ -0,0 +1,304 @@
+#ifndef SQUASHFS_FS
+#define SQUASHFS_FS
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002 Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * 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.
+ *
+ * squashfs_fs.h
+ */
+
+#define SQUASHFS_MAJOR			1
+#define SQUASHFS_MINOR			0
+#define SQUASHFS_MAGIC			0x73717368
+#define SQUASHFS_MAGIC_SWAP		0x68737173
+#define SQUASHFS_START			0
+
+/* size of metadata (inode and directory) blocks */
+#define SQUASHFS_METADATA_SIZE		8192
+#define SQUASHFS_METADATA_LOG		13
+
+/* default size of data blocks */
+#define SQUASHFS_FILE_SIZE		32768
+#define SQUASHFS_FILE_LOG		15
+
+#define SQUASHFS_FILE_MAX_SIZE		32768
+
+/* Max number of uids and gids */
+#define SQUASHFS_UIDS			48
+#define SQUASHFS_GUIDS			15
+
+/* Max length of filename (not 255) */
+#define SQUASHFS_NAME_LEN		256
+
+#define SQUASHFS_INVALID		((long long) 0xffffffffffff)
+#define SQUASHFS_INVALID_BLK		((long long) 0xffffffff)
+#define SQUASHFS_USED_BLK		((long long) 0xfffffffe)
+
+/* Filesystem flags */
+#define SQUASHFS_NOI			1
+#define SQUASHFS_NOD			2
+#define SQUASHFS_CHECK			4
+#define SQUASHFS_UNCOMPRESSED_INODES(flags)	(flags & SQUASHFS_NOI)
+#define SQUASHFS_UNCOMPRESSED_DATA(flags)	(flags & SQUASHFS_NOD)
+#define SQUASHFS_CHECK_DATA(flags)		(flags & SQUASHFS_CHECK)
+#define SQUASHFS_MKFLAGS(noi, nod, check_data)	(noi | (nod << 1) | (check_data << 2))
+
+/* Max number of types and file types */
+#define SQUASHFS_TYPES			5
+#define SQUASHFS_DIR_TYPE		1
+#define SQUASHFS_FILE_TYPE		2
+#define SQUASHFS_SYMLINK_TYPE		3
+#define SQUASHFS_BLKDEV_TYPE		4
+#define SQUASHFS_CHRDEV_TYPE		5
+
+/* Flag whether block is compressed or uncompressed, bit is set if block is uncompressed */
+#define SQUASHFS_COMPRESSED_BIT		(1 << 15)
+#define SQUASHFS_COMPRESSED_SIZE(B)	(((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
+					(B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
+
+#define SQUASHFS_COMPRESSED(B)		(!((B) & SQUASHFS_COMPRESSED_BIT))
+
+/*
+ * Inode number ops.  Inodes consist of a compressed block number, and an uncompressed
+ * offset within that block
+ */
+#define SQUASHFS_INODE_BLK(a)		((unsigned int) ((a) >> 16))
+#define SQUASHFS_INODE_OFFSET(a)	((unsigned int) ((a) & 0xffff))
+#define SQUASHFS_MKINODE(A, B)		((squashfs_inode)(((squashfs_inode) (A) << 16)\
+					+ (B)))
+
+/* Compute 32 bit VFS inode number from squashfs inode number */
+#define SQUASHFS_MK_VFS_INODE(a, b)	((unsigned int) (((a) << 8) + ((b) >> 2) + 1))
+
+/* Translate between VFS mode and squashfs mode */
+#define SQUASHFS_MODE(a)		((a) & 0xfff)
+
+/* cached data constants for filesystem */
+#define SQUASHFS_CACHED_BLKS		8
+
+#define SQUASHFS_MAX_FILE_SIZE_LOG	32
+#define SQUASHFS_MAX_FILE_SIZE		((long long) 1 << SQUASHFS_MAX_FILE_SIZE_LOG - 1)
+
+#define SQUASHFS_MARKER_BYTE		0xff
+
+/*
+ * definitions for structures on disk
+ */
+
+typedef unsigned int		squashfs_block;
+typedef long long		squashfs_inode;
+
+typedef unsigned int		squashfs_uid;
+
+typedef struct squashfs_super_block {
+	unsigned int		s_magic __attribute__ ((packed));
+	unsigned int		inodes __attribute__ ((packed));
+	unsigned int		bytes_used __attribute__ ((packed));
+	unsigned int		uid_start __attribute__ ((packed));
+	unsigned int		guid_start __attribute__ ((packed));
+	unsigned int		inode_table_start __attribute__ ((packed));
+	unsigned int		directory_table_start __attribute__ ((packed));
+	unsigned int		s_major:16 __attribute__ ((packed));
+	unsigned int		s_minor:16 __attribute__ ((packed));
+	unsigned int		block_size:16 __attribute__ ((packed));
+	unsigned int		block_log:16 __attribute__ ((packed));
+	unsigned int		flags:8 __attribute__ ((packed));
+	unsigned int		no_uids:8 __attribute__ ((packed));
+	unsigned int		no_guids:8 __attribute__ ((packed));
+	time_t			mkfs_time /* time of filesystem creation */ __attribute__ ((packed));
+	squashfs_inode		root_inode __attribute__ ((packed));
+} squashfs_super_block;
+
+typedef struct {
+	unsigned int		inode_type:4 __attribute__ ((packed));
+	unsigned int		mode:12 __attribute__ ((packed)); /* protection */
+	unsigned int		uid:4 __attribute__ ((packed)); /* index into uid table */
+	unsigned int		guid:4 __attribute__ ((packed)); /* index into guid table */
+} squashfs_base_inode_header;
+
+typedef struct {
+	unsigned int		inode_type:4 __attribute__ ((packed));
+	unsigned int		mode:12 __attribute__ ((packed)); /* protection */
+	unsigned int		uid:4 __attribute__ ((packed)); /* index into uid table */
+	unsigned int		guid:4 __attribute__ ((packed)); /* index into guid table */
+	unsigned short		rdev __attribute__ ((packed));
+} squashfs_dev_inode_header;
+	
+typedef struct {
+	unsigned int		inode_type:4 __attribute__ ((packed));
+	unsigned int		mode:12 __attribute__ ((packed)); /* protection */
+	unsigned int		uid:4 __attribute__ ((packed)); /* index into uid table */
+	unsigned int		guid:4 __attribute__ ((packed)); /* index into guid table */
+	unsigned short		symlink_size __attribute__ ((packed));
+	char			symlink[0] __attribute__ ((packed));
+} squashfs_symlink_inode_header;
+
+typedef struct {
+	unsigned int		inode_type:4 __attribute__ ((packed));
+	unsigned int		mode:12 __attribute__ ((packed)); /* protection */
+	unsigned int		uid:4 __attribute__ ((packed)); /* index into uid table */
+	unsigned int		guid:4 __attribute__ ((packed)); /* index into guid table */
+	time_t			mtime __attribute__ ((packed));
+	squashfs_block		start_block __attribute__ ((packed));
+	unsigned int		file_size:SQUASHFS_MAX_FILE_SIZE_LOG __attribute__ ((packed));
+	unsigned short		block_list[0]  __attribute__ ((packed));
+} squashfs_reg_inode_header;
+
+typedef struct {
+	unsigned int		inode_type:4 __attribute__ ((packed));
+	unsigned int		mode:12 __attribute__ ((packed)); /* protection */
+	unsigned int		uid:4 __attribute__ ((packed)); /* index into uid table */
+	unsigned int		guid:4 __attribute__ ((packed)); /* index into guid table */
+	unsigned int		file_size:19 __attribute__ ((packed));
+	unsigned int		offset:13 __attribute__ ((packed));
+	time_t			mtime __attribute__ ((packed));
+	unsigned int		start_block:24 __attribute__ ((packed));
+} squashfs_dir_inode_header;
+
+typedef union {
+	squashfs_base_inode_header	base;
+	squashfs_dev_inode_header	dev;
+	squashfs_symlink_inode_header	symlink;
+	squashfs_reg_inode_header	reg;
+	squashfs_dir_inode_header	dir;
+} squashfs_inode_header;
+	
+typedef struct {
+	unsigned int		offset:13 __attribute__ ((packed));
+	unsigned int		type:3 __attribute__ ((packed));
+	unsigned int		size:8 __attribute__ ((packed));
+	char			name[0] __attribute__ ((packed));
+} squashfs_dir_entry;
+
+typedef struct {
+	unsigned int		count:8 __attribute__ ((packed));
+	unsigned int		start_block:24 __attribute__ ((packed));
+} squashfs_dir_header;
+
+
+extern int squashfs_uncompress_block(void *d, int dstlen, void *s, int srclen);
+extern int squashfs_uncompress_init(void);
+extern int squashfs_uncompress_exit(void);
+
+/*
+ * macros to convert each packed bitfield structure from little endian to big
+ * endian and vice versa.  These are needed when creating or using a filesystem on a
+ * machine with different byte ordering to the target architecture.
+ *
+ */
+
+#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
+	SQUASHFS_MEMSET(s, d, sizeof(squashfs_super_block));\
+	SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
+	SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
+	SQUASHFS_SWAP((s)->bytes_used, d, 64, 32);\
+	SQUASHFS_SWAP((s)->uid_start, d, 96, 32);\
+	SQUASHFS_SWAP((s)->guid_start, d, 128, 32);\
+	SQUASHFS_SWAP((s)->inode_table_start, d, 160, 32);\
+	SQUASHFS_SWAP((s)->directory_table_start, d, 192, 32);\
+	SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
+	SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
+	SQUASHFS_SWAP((s)->block_size, d, 256, 16);\
+	SQUASHFS_SWAP((s)->block_log, d, 272, 16);\
+	SQUASHFS_SWAP((s)->flags, d, 288, 8);\
+	SQUASHFS_SWAP((s)->no_uids, d, 296, 8);\
+	SQUASHFS_SWAP((s)->no_guids, d, 304, 8);\
+	SQUASHFS_SWAP((s)->mkfs_time, d, 312, 32);\
+	SQUASHFS_SWAP((s)->root_inode, d, 344, 64);\
+}
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
+	SQUASHFS_MEMSET(s, d, n);\
+	SQUASHFS_SWAP((s)->inode_type, d, 0, 4);\
+	SQUASHFS_SWAP((s)->mode, d, 4, 12);\
+	SQUASHFS_SWAP((s)->uid, d, 16, 4);\
+	SQUASHFS_SWAP((s)->guid, d, 20, 4);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, sizeof(squashfs_dev_inode_header));\
+	SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, sizeof(squashfs_symlink_inode_header));\
+	SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, sizeof(squashfs_reg_inode_header));\
+	SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
+	SQUASHFS_SWAP((s)->file_size, d, 88, SQUASHFS_MAX_FILE_SIZE_LOG);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
+	SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, sizeof(squashfs_dir_inode_header));\
+	SQUASHFS_SWAP((s)->file_size, d, 24, 19);\
+	SQUASHFS_SWAP((s)->offset, d, 43, 13);\
+	SQUASHFS_SWAP((s)->mtime, d, 56, 32);\
+	SQUASHFS_SWAP((s)->start_block, d, 88, 24);\
+}
+
+#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
+	SQUASHFS_MEMSET(s, d, sizeof(squashfs_dir_header));\
+	SQUASHFS_SWAP((s)->count, d, 0, 8);\
+	SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
+	SQUASHFS_MEMSET(s, d, sizeof(squashfs_dir_entry));\
+	SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+	SQUASHFS_SWAP((s)->type, d, 13, 3);\
+	SQUASHFS_SWAP((s)->size, d, 16, 8);\
+}
+
+#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
+	int entry;\
+	int bit_position;\
+	SQUASHFS_MEMSET(s, d, n * 2);\
+	for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += 16)\
+		SQUASHFS_SWAP(s[entry], d, bit_position, 16);\
+}
+
+#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
+	int entry;\
+	int bit_position;\
+	SQUASHFS_MEMSET(s, d, n * bits / 8);\
+	for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += bits)\
+		SQUASHFS_SWAP(s[entry], d, bit_position, bits);\
+}
+
+#ifdef __KERNEL__
+/*
+ * macros used to swap each structure entry, taking into account
+ * bitfields and different bitfield placing conventions on differing architectures
+ */
+#include <asm/byteorder.h>
+#ifdef __BIG_ENDIAN
+	/* convert from little endian to big endian */
+#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, tbits, b_pos)
+#else
+	/* convert from big endian to little endian */ 
+#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, tbits, 64 - tbits - b_pos)
+#endif
+
+#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
+	int bits;\
+	int b_pos = pos % 8;\
+	unsigned long long val = 0;\
+	unsigned char *s = (unsigned char *)p + (pos / 8);\
+	unsigned char *d = ((unsigned char *) &val) + 7;\
+	for(bits = 0; bits < (tbits + b_pos); bits += 8) \
+		*d-- = *s++;\
+	value = val >> (SHIFT);\
+}
+#define SQUASHFS_MEMSET(s, d, n)	memset(s, 0, n);
+#endif
+#endif
diff -Naur linux-2.6.0-test1-ac2/include/linux/squashfs_fs_sb.h linux-2.6.0-test1-ac2-sfs/include/linux/squashfs_fs_sb.h
--- linux-2.6.0-test1-ac2/include/linux/squashfs_fs_sb.h	1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.0-test1-ac2-sfs/include/linux/squashfs_fs_sb.h	2003-07-18 16:12:47.000000000 -0700
@@ -0,0 +1,41 @@
+#ifndef SQUASHFS_FS_SB
+#define SQUASHFS_FS_SB
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002 Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * 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.
+ *
+ * squashfs_fs_sb.h
+ */
+
+#include <linux/squashfs_fs.h>
+
+typedef struct {
+	unsigned int	block;
+	int		length;
+	unsigned int	next_index;
+	char		*data;
+	} squashfs_cache;
+
+typedef struct squashfs_sb_info {
+	squashfs_super_block	sBlk;
+	int			devblksize;
+	int			devblksize_log2;
+	int			swap;
+	squashfs_cache		*block_cache;
+	int			next_cache;
+	squashfs_uid		*uid;
+	squashfs_uid		*guid;
+	unsigned int		read_size;
+	char			*read_data;
+	char			*read_page;
+	struct semaphore	read_page_mutex;
+	struct semaphore	block_cache_mutex;
+	wait_queue_head_t	waitq;
+	} squashfs_sb_info;
+#endif
diff -Naur linux-2.6.0-test1-ac2/lib/Kconfig linux-2.6.0-test1-ac2-sfs/lib/Kconfig
--- linux-2.6.0-test1-ac2/lib/Kconfig	2003-05-04 16:53:32.000000000 -0700
+++ linux-2.6.0-test1-ac2-sfs/lib/Kconfig	2003-07-16 16:40:44.000000000 -0700
@@ -17,8 +17,8 @@
 #
 config ZLIB_INFLATE
 	tristate
-	default y if CRAMFS=y || PPP_DEFLATE=y || JFFS2_FS=y || ZISOFS_FS=y || BINFMT_ZFLAT=y || CRYPTO_DEFLATE=y
-	default m if CRAMFS=m || PPP_DEFLATE=m || JFFS2_FS=m || ZISOFS_FS=m || BINFMT_ZFLAT=m || CRYPTO_DEFLATE=m
+	default y if CRAMFS=y || SQUASHFS=y || PPP_DEFLATE=y || JFFS2_FS=y || ZISOFS_FS=y || BINFMT_ZFLAT=y || CRYPTO_DEFLATE=y
+	default m if CRAMFS=m || SQUASHFS=m || PPP_DEFLATE=m || JFFS2_FS=m || ZISOFS_FS=m || BINFMT_ZFLAT=m || CRYPTO_DEFLATE=m
 
 config ZLIB_DEFLATE
 	tristate