source: clfs-embedded/patches/linux-2.6.20-squashfs-1.patch@ 3c8eaa6

linux-2.6.19.

@@ -1407 +1407 @@
 
           If unsure, say N.
 
+config SQUASHFS
+        tristate "SquashFS 3.1 - Squashed file system support"
+        select ZLIB_INFLATE
+        help
+          Saying Y here includes support for SquashFS 3.1 (a Compressed Read-Only File
+          System).  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 64K.
+          SquashFS 3.1 supports 64 bit filesystems and files (larger than 4GB), full
+          uid/gid information, hard links and timestamps.
+
+          Squashfs is intended for general read-only filesystem use, for archival
+          use (i.e. in cases where a .tar.gz file may be used), and in embedded
+          systems where low overhead is needed.  Further information and filesystem tools
+          are available from http://squashfs.sourceforge.net.
+
+          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 SQUASHFS_EMBEDDED
+
+        bool "Additional options for memory-constrained systems" 
+        depends on SQUASHFS
+        default n
+        help
+          Saying Y here allows you to specify cache sizes and how Squashfs
+          allocates memory.  This is only intended for memory constrained
+          systems.
+
+          If unsure, say N.
+
+config SQUASHFS_FRAGMENT_CACHE_SIZE
+        int "Number of fragments cached" if SQUASHFS_EMBEDDED
+        depends on SQUASHFS
+        default "3"
+        help
+          By default SquashFS caches the last 3 fragments read from
+          the filesystem.  Increasing this amount may mean SquashFS
+          has to re-read fragments less often from disk, at the expense
+          of extra system memory.  Decreasing this amount will mean
+          SquashFS uses less memory at the expense of extra reads from disk.
+
+          Note there must be at least one cached fragment.  Anything
+          much more than three will probably not make much difference.
+
+config SQUASHFS_VMALLOC
+        bool "Use Vmalloc rather than Kmalloc" if SQUASHFS_EMBEDDED
+        depends on SQUASHFS
+        default n
+        help
+          By default SquashFS uses kmalloc to obtain fragment cache memory.
+          Kmalloc memory is the standard kernel allocator, but it can fail
+          on memory constrained systems.  Because of the way Vmalloc works,
+          Vmalloc can succeed when kmalloc fails.  Specifying this option
+          will make SquashFS always use Vmalloc to allocate the
+          fragment cache memory.
+
+          If unsure, say N.
+
 config VXFS_FS
         tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
         depends on BLOCK

linux-2.6.19.

@@ -67 +67 @@
 obj-$(CONFIG_JBD2)              += jbd2/
 obj-$(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/

fs/squashfs/Makefile

@@ +1 @@
+#
+# Makefile for the linux squashfs routines.
+#
+
+obj-$(CONFIG_SQUASHFS) += squashfs.o
+squashfs-y += inode.o
+squashfs-y += squashfs2_0.o

fs/squashfs/inode.c

@@ +1 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * inode.c
+ */
+
+#include <linux/types.h>
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/zlib.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/init.h>
+#include <linux/dcache.h>
+#include <linux/wait.h>
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#include "squashfs.h"
+
+static void squashfs_put_super(struct super_block *);
+static int squashfs_statfs(struct dentry *, 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_readpage4K(struct file *file, struct page *page);
+static int squashfs_readdir(struct file *, void *, filldir_t);
+static struct inode *squashfs_alloc_inode(struct super_block *sb);
+static void squashfs_destroy_inode(struct inode *inode);
+static int init_inodecache(void);
+static void destroy_inodecache(void);
+static struct dentry *squashfs_lookup(struct inode *, struct dentry *,
+                                struct nameidata *);
+static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode);
+static long long read_blocklist(struct inode *inode, int index,
+                                int readahead_blks, char *block_list,
+                                unsigned short **block_p, unsigned int *bsize);
+static int squashfs_get_sb(struct file_system_type *, int, const char *, void *,
+                                struct vfsmount *);
+
+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 char squashfs_filetype_table[] = {
+        DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static struct super_operations squashfs_ops = {
+        .alloc_inode = squashfs_alloc_inode,
+        .destroy_inode = squashfs_destroy_inode,
+        .statfs = squashfs_statfs,
+        .put_super = squashfs_put_super,
+};
+
+SQSH_EXTERN struct address_space_operations squashfs_symlink_aops = {
+        .readpage = squashfs_symlink_readpage
+};
+
+SQSH_EXTERN struct address_space_operations squashfs_aops = {
+        .readpage = squashfs_readpage
+};
+
+SQSH_EXTERN struct address_space_operations squashfs_aops_4K = {
+        .readpage = squashfs_readpage4K
+};
+
+static struct file_operations squashfs_dir_ops = {
+        .read = generic_read_dir,
+        .readdir = squashfs_readdir
+};
+
+SQSH_EXTERN struct inode_operations squashfs_dir_inode_ops = {
+        .lookup = squashfs_lookup
+};
+
+
+static struct buffer_head *get_block_length(struct super_block *s,
+                                int *cur_index, int *offset, int *c_byte)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        unsigned short temp;
+        struct buffer_head *bh;
+
+        if (!(bh = sb_bread(s, *cur_index)))
+                goto out;
+
+        if (msblk->devblksize - *offset == 1) {
+                if (msblk->swap)
+                        ((unsigned char *) &temp)[1] = *((unsigned char *)
+                                (bh->b_data + *offset));
+                else
+                        ((unsigned char *) &temp)[0] = *((unsigned char *)
+                                (bh->b_data + *offset));
+                brelse(bh);
+                if (!(bh = sb_bread(s, ++(*cur_index))))
+                        goto out;
+                if (msblk->swap)
+                        ((unsigned char *) &temp)[0] = *((unsigned char *)
+                                bh->b_data); 
+                else
+                        ((unsigned char *) &temp)[1] = *((unsigned char *)
+                                bh->b_data); 
+                *c_byte = temp;
+                *offset = 1;
+        } else {
+                if (msblk->swap) {
+                        ((unsigned char *) &temp)[1] = *((unsigned char *)
+                                (bh->b_data + *offset));
+                        ((unsigned char *) &temp)[0] = *((unsigned char *)
+                                (bh->b_data + *offset + 1)); 
+                } else {
+                        ((unsigned char *) &temp)[0] = *((unsigned char *)
+                                (bh->b_data + *offset));
+                        ((unsigned char *) &temp)[1] = *((unsigned char *)
+                                (bh->b_data + *offset + 1)); 
+                }
+                *c_byte = temp;
+                *offset += 2;
+        }
+
+        if (SQUASHFS_CHECK_DATA(msblk->sblk.flags)) {
+                if (*offset == msblk->devblksize) {
+                        brelse(bh);
+                        if (!(bh = sb_bread(s, ++(*cur_index))))
+                                goto out;
+                        *offset = 0;
+                }
+                if (*((unsigned char *) (bh->b_data + *offset)) !=
+                                                SQUASHFS_MARKER_BYTE) {
+                        ERROR("Metadata block marker corrupt @ %x\n",
+                                                *cur_index);
+                        brelse(bh);
+                        goto out;
+                }
+                (*offset)++;
+        }
+        return bh;
+
+out:
+        return NULL;
+}
+
+
+SQSH_EXTERN unsigned int squashfs_read_data(struct super_block *s, char *buffer,
+                        long long index, unsigned int length,
+                        long long *next_index)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct buffer_head *bh[((SQUASHFS_FILE_MAX_SIZE - 1) >>
+                        msblk->devblksize_log2) + 2];
+        unsigned int offset = index & ((1 << msblk->devblksize_log2) - 1);
+        unsigned int cur_index = index >> msblk->devblksize_log2;
+        int bytes, avail_bytes, b = 0, k;
+        char *c_buffer;
+        unsigned int compressed;
+        unsigned int c_byte = length;
+
+        if (c_byte) {
+                bytes = msblk->devblksize - offset;
+                compressed = SQUASHFS_COMPRESSED_BLOCK(c_byte);
+                c_buffer = compressed ? msblk->read_data : buffer;
+                c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte);
+
+                TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
+                                        ? "" : "un", (unsigned int) c_byte);
+
+                if (!(bh[0] = sb_getblk(s, cur_index)))
+                        goto block_release;
+
+                for (b = 1; bytes < c_byte; b++) {
+                        if (!(bh[b] = sb_getblk(s, ++cur_index)))
+                                goto block_release;
+                        bytes += msblk->devblksize;
+                }
+                ll_rw_block(READ, b, bh);
+        } else {
+                if (!(bh[0] = get_block_length(s, &cur_index, &offset,
+                                                                &c_byte)))
+                        goto read_failure;
+
+                bytes = msblk->devblksize - offset;
+                compressed = SQUASHFS_COMPRESSED(c_byte);
+                c_buffer = compressed ? msblk->read_data : buffer;
+                c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
+
+                TRACE("Block @ 0x%llx, %scompressed size %d\n", index, compressed
+                                        ? "" : "un", (unsigned int) c_byte);
+
+                for (b = 1; bytes < c_byte; b++) {
+                        if (!(bh[b] = sb_getblk(s, ++cur_index)))
+                                goto block_release;
+                        bytes += msblk->devblksize;
+                }
+                ll_rw_block(READ, b - 1, bh + 1);
+        }
+
+        if (compressed)
+                down(&msblk->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;
+                wait_on_buffer(bh[k]);
+                if (!buffer_uptodate(bh[k]))
+                        goto block_release;
+                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;
+
+                msblk->stream.next_in = c_buffer;
+                msblk->stream.avail_in = c_byte;
+                msblk->stream.next_out = buffer;
+                msblk->stream.avail_out = msblk->read_size;
+
+                if (((zlib_err = zlib_inflateInit(&msblk->stream)) != Z_OK) ||
+                                ((zlib_err = zlib_inflate(&msblk->stream, Z_FINISH))
+                                 != Z_STREAM_END) || ((zlib_err =
+                                zlib_inflateEnd(&msblk->stream)) != Z_OK)) {
+                        ERROR("zlib_fs returned unexpected result 0x%x\n",
+                                zlib_err);
+                        bytes = 0;
+                } else
+                        bytes = msblk->stream.total_out;
+                
+                up(&msblk->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;
+}
+
+
+SQSH_EXTERN int squashfs_get_cached_block(struct super_block *s, char *buffer,
+                                long long block, unsigned int offset,
+                                int length, long long *next_block,
+                                unsigned int *next_offset)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        int n, i, bytes, return_length = length;
+        long long next_index;
+
+        TRACE("Entered squashfs_get_cached_block [%llx:%x]\n", block, offset);
+
+        while ( 1 ) {
+                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) {
+                                wait_queue_t wait;
+
+                                init_waitqueue_entry(&wait, current);
+                                add_wait_queue(&msblk->waitq, &wait);
+                                set_current_state(TASK_UNINTERRUPTIBLE);
+                                up(&msblk->block_cache_mutex);
+                                schedule();
+                                set_current_state(TASK_RUNNING);
+                                remove_wait_queue(&msblk->waitq, &wait);
+                                continue;
+                        }
+                        msblk->next_cache = (i + 1) % SQUASHFS_CACHED_BLKS;
+
+                        if (msblk->block_cache[i].block ==
+                                                        SQUASHFS_INVALID_BLK) {
+                                if (!(msblk->block_cache[i].data =
+                                                kmalloc(SQUASHFS_METADATA_SIZE,
+                                                GFP_KERNEL))) {
+                                        ERROR("Failed to allocate cache"
+                                                        "block\n");
+                                        up(&msblk->block_cache_mutex);
+                                        goto out;
+                                }
+                        }
+        
+                        msblk->block_cache[i].block = SQUASHFS_USED_BLK;
+                        up(&msblk->block_cache_mutex);
+
+                        if (!(msblk->block_cache[i].length =
+                                                squashfs_read_data(s,
+                                                msblk->block_cache[i].data,
+                                                block, 0, &next_index))) {
+                                ERROR("Unable to read cache block [%llx:%x]\n",
+                                                block, offset);
+                                goto out;
+                        }
+
+                        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 [%llx:%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) {
+                        if (buffer)
+                                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);
+                        goto finish;
+                } else {
+                        if (buffer) {
+                                memcpy(buffer, msblk->block_cache[i].data +
+                                                offset, bytes);
+                                buffer += bytes;
+                        }
+                        block = msblk->block_cache[i].next_index;
+                        up(&msblk->block_cache_mutex);
+                        length -= bytes;
+                        offset = 0;
+                }
+        }
+
+finish:
+        return return_length;
+out:
+        return 0;
+}
+
+
+static int get_fragment_location(struct super_block *s, unsigned int fragment,
+                                long long *fragment_start_block,
+                                unsigned int *fragment_size)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        long long start_block =
+                msblk->fragment_index[SQUASHFS_FRAGMENT_INDEX(fragment)];
+        int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET(fragment);
+        struct squashfs_fragment_entry fragment_entry;
+
+        if (msblk->swap) {
+                struct squashfs_fragment_entry sfragment_entry;
+
+                if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
+                                        start_block, offset,
+                                        sizeof(sfragment_entry), &start_block,
+                                        &offset))
+                        goto out;
+                SQUASHFS_SWAP_FRAGMENT_ENTRY(&fragment_entry, &sfragment_entry);
+        } else
+                if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
+                                        start_block, offset,
+                                        sizeof(fragment_entry), &start_block,
+                                        &offset))
+                        goto out;
+
+        *fragment_start_block = fragment_entry.start_block;
+        *fragment_size = fragment_entry.size;
+
+        return 1;
+
+out:
+        return 0;
+}
+
+
+SQSH_EXTERN void release_cached_fragment(struct squashfs_sb_info *msblk, struct
+                                        squashfs_fragment_cache *fragment)
+{
+        down(&msblk->fragment_mutex);
+        fragment->locked --;
+        wake_up(&msblk->fragment_wait_queue);
+        up(&msblk->fragment_mutex);
+}
+
+
+SQSH_EXTERN struct squashfs_fragment_cache *get_cached_fragment(struct super_block
+                                        *s, long long start_block,
+                                        int length)
+{
+        int i, n;
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+
+        while ( 1 ) {
+                down(&msblk->fragment_mutex);
+
+                for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS &&
+                                msblk->fragment[i].block != start_block; i++);
+
+                if (i == SQUASHFS_CACHED_FRAGMENTS) {
+                        for (i = msblk->next_fragment, n =
+                                SQUASHFS_CACHED_FRAGMENTS; n &&
+                                msblk->fragment[i].locked; n--, i = (i + 1) %
+                                SQUASHFS_CACHED_FRAGMENTS);
+
+                        if (n == 0) {
+                                wait_queue_t wait;
+
+                                init_waitqueue_entry(&wait, current);
+                                add_wait_queue(&msblk->fragment_wait_queue,
+                                                                        &wait);
+                                set_current_state(TASK_UNINTERRUPTIBLE);
+                                up(&msblk->fragment_mutex);
+                                schedule();
+                                set_current_state(TASK_RUNNING);
+                                remove_wait_queue(&msblk->fragment_wait_queue,
+                                                                        &wait);
+                                continue;
+                        }
+                        msblk->next_fragment = (msblk->next_fragment + 1) %
+                                SQUASHFS_CACHED_FRAGMENTS;
+                        
+                        if (msblk->fragment[i].data == NULL)
+                                if (!(msblk->fragment[i].data = SQUASHFS_ALLOC
+                                                (SQUASHFS_FILE_MAX_SIZE))) {
+                                        ERROR("Failed to allocate fragment "
+                                                        "cache block\n");
+                                        up(&msblk->fragment_mutex);
+                                        goto out;
+                                }
+
+                        msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
+                        msblk->fragment[i].locked = 1;
+                        up(&msblk->fragment_mutex);
+
+                        if (!(msblk->fragment[i].length = squashfs_read_data(s,
+                                                msblk->fragment[i].data,
+                                                start_block, length, NULL))) {
+                                ERROR("Unable to read fragment cache block "
+                                                        "[%llx]\n", start_block);
+                                msblk->fragment[i].locked = 0;
+                                goto out;
+                        }
+
+                        msblk->fragment[i].block = start_block;
+                        TRACE("New fragment %d, start block %lld, locked %d\n",
+                                                i, msblk->fragment[i].block,
+                                                msblk->fragment[i].locked);
+                        break;
+                }
+
+                msblk->fragment[i].locked++;
+                up(&msblk->fragment_mutex);
+                TRACE("Got fragment %d, start block %lld, locked %d\n", i,
+                                                msblk->fragment[i].block,
+                                                msblk->fragment[i].locked);
+                break;
+        }
+
+        return &msblk->fragment[i];
+
+out:
+        return NULL;
+}
+
+
+static struct inode *squashfs_new_inode(struct super_block *s,
+                struct squashfs_base_inode_header *inodeb)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct inode *i = new_inode(s);
+
+        if (i) {
+                i->i_ino = inodeb->inode_number;
+                i->i_mtime.tv_sec = inodeb->mtime;
+                i->i_atime.tv_sec = inodeb->mtime;
+                i->i_ctime.tv_sec = inodeb->mtime;
+                i->i_uid = msblk->uid[inodeb->uid];
+                i->i_mode = inodeb->mode;
+                i->i_size = 0;
+                if (inodeb->guid == SQUASHFS_GUIDS)
+                        i->i_gid = i->i_uid;
+                else
+                        i->i_gid = msblk->guid[inodeb->guid];
+        }
+
+        return i;
+}
+
+
+static struct inode *squashfs_iget(struct super_block *s, squashfs_inode_t inode)
+{
+        struct inode *i;
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        long long block = SQUASHFS_INODE_BLK(inode) +
+                sblk->inode_table_start;
+        unsigned int offset = SQUASHFS_INODE_OFFSET(inode);
+        long long next_block;
+        unsigned int next_offset;
+        union squashfs_inode_header id, sid;
+        struct squashfs_base_inode_header *inodeb = &id.base,
+                                          *sinodeb = &sid.base;
+
+        TRACE("Entered squashfs_iget\n");
+
+        if (msblk->swap) {
+                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;
+
+        switch(inodeb->inode_type) {
+                case SQUASHFS_FILE_TYPE: {
+                        unsigned int frag_size;
+                        long long frag_blk;
+                        struct squashfs_reg_inode_header *inodep = &id.reg;
+                        struct squashfs_reg_inode_header *sinodep = &sid.reg;
+                                
+                        if (msblk->swap) {
+                                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;
+
+                        frag_blk = SQUASHFS_INVALID_BLK;
+                        if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+                                        !get_fragment_location(s,
+                                        inodep->fragment, &frag_blk, &frag_size))
+                                goto failed_read;
+                                
+                        if((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = 1;
+                        i->i_size = inodep->file_size;
+                        i->i_fop = &generic_ro_fops;
+                        i->i_mode |= S_IFREG;
+                        i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+                        SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+                        SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+                        SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+                        SQUASHFS_I(i)->offset = next_offset;
+                        if (sblk->block_size > 4096)
+                                i->i_data.a_ops = &squashfs_aops;
+                        else
+                                i->i_data.a_ops = &squashfs_aops_4K;
+
+                        TRACE("File inode %x:%x, start_block %llx, "
+                                        "block_list_start %llx, offset %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        inodep->start_block, next_block,
+                                        next_offset);
+                        break;
+                }
+                case SQUASHFS_LREG_TYPE: {
+                        unsigned int frag_size;
+                        long long frag_blk;
+                        struct squashfs_lreg_inode_header *inodep = &id.lreg;
+                        struct squashfs_lreg_inode_header *sinodep = &sid.lreg;
+                                
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_LREG_INODE_HEADER(inodep, sinodep);
+                        } else
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        frag_blk = SQUASHFS_INVALID_BLK;
+                        if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+                                        !get_fragment_location(s,
+                                        inodep->fragment, &frag_blk, &frag_size))
+                                goto failed_read;
+                                
+                        if((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = inodep->nlink;
+                        i->i_size = inodep->file_size;
+                        i->i_fop = &generic_ro_fops;
+                        i->i_mode |= S_IFREG;
+                        i->i_blocks = ((i->i_size - 1) >> 9) + 1;
+                        SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+                        SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+                        SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+                        SQUASHFS_I(i)->offset = next_offset;
+                        if (sblk->block_size > 4096)
+                                i->i_data.a_ops = &squashfs_aops;
+                        else
+                                i->i_data.a_ops = &squashfs_aops_4K;
+
+                        TRACE("File inode %x:%x, start_block %llx, "
+                                        "block_list_start %llx, offset %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        inodep->start_block, next_block,
+                                        next_offset);
+                        break;
+                }
+                case SQUASHFS_DIR_TYPE: {
+                        struct squashfs_dir_inode_header *inodep = &id.dir;
+                        struct squashfs_dir_inode_header *sinodep = &sid.dir;
+
+                        if (msblk->swap) {
+                                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;
+
+                        if((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = inodep->nlink;
+                        i->i_size = inodep->file_size;
+                        i->i_op = &squashfs_dir_inode_ops;
+                        i->i_fop = &squashfs_dir_ops;
+                        i->i_mode |= S_IFDIR;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->offset = inodep->offset;
+                        SQUASHFS_I(i)->u.s2.directory_index_count = 0;
+                        SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+                        TRACE("Directory inode %x:%x, start_block %x, offset "
+                                        "%x\n", SQUASHFS_INODE_BLK(inode),
+                                        offset, inodep->start_block,
+                                        inodep->offset);
+                        break;
+                }
+                case SQUASHFS_LDIR_TYPE: {
+                        struct squashfs_ldir_inode_header *inodep = &id.ldir;
+                        struct squashfs_ldir_inode_header *sinodep = &sid.ldir;
+
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_LDIR_INODE_HEADER(inodep,
+                                                sinodep);
+                        } else
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        if((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = inodep->nlink;
+                        i->i_size = inodep->file_size;
+                        i->i_op = &squashfs_dir_inode_ops;
+                        i->i_fop = &squashfs_dir_ops;
+                        i->i_mode |= S_IFDIR;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->offset = inodep->offset;
+                        SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
+                        SQUASHFS_I(i)->u.s2.directory_index_offset =
+                                                                next_offset;
+                        SQUASHFS_I(i)->u.s2.directory_index_count =
+                                                                inodep->i_count;
+                        SQUASHFS_I(i)->u.s2.parent_inode = inodep->parent_inode;
+
+                        TRACE("Long 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: {
+                        struct squashfs_symlink_inode_header *inodep =
+                                                                &id.symlink;
+                        struct squashfs_symlink_inode_header *sinodep =
+                                                                &sid.symlink;
+        
+                        if (msblk->swap) {
+                                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;
+
+                        if((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = inodep->nlink;
+                        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;
+                        SQUASHFS_I(i)->start_block = next_block;
+                        SQUASHFS_I(i)->offset = next_offset;
+
+                        TRACE("Symbolic link inode %x:%x, start_block %llx, "
+                                        "offset %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        next_block, next_offset);
+                        break;
+                 }
+                 case SQUASHFS_BLKDEV_TYPE:
+                 case SQUASHFS_CHRDEV_TYPE: {
+                        struct squashfs_dev_inode_header *inodep = &id.dev;
+                        struct squashfs_dev_inode_header *sinodep = &sid.dev;
+
+                        if (msblk->swap) {
+                                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;
+
+                        if ((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = inodep->nlink;
+                        i->i_mode |= (inodeb->inode_type ==
+                                        SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
+                                        S_IFBLK;
+                        init_special_inode(i, i->i_mode,
+                                        old_decode_dev(inodep->rdev));
+
+                        TRACE("Device inode %x:%x, rdev %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        inodep->rdev);
+                        break;
+                 }
+                 case SQUASHFS_FIFO_TYPE:
+                 case SQUASHFS_SOCKET_TYPE: {
+                        struct squashfs_ipc_inode_header *inodep = &id.ipc;
+                        struct squashfs_ipc_inode_header *sinodep = &sid.ipc;
+
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_IPC_INODE_HEADER(inodep, sinodep);
+                        } else  
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        if ((i = squashfs_new_inode(s, inodeb)) == NULL)
+                                goto failed_read1;
+
+                        i->i_nlink = inodep->nlink;
+                        i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
+                                                        ? S_IFIFO : S_IFSOCK;
+                        init_special_inode(i, i->i_mode, 0);
+                        break;
+                 }
+                 default:
+                        ERROR("Unknown inode type %d in squashfs_iget!\n",
+                                        inodeb->inode_type);
+                        goto failed_read1;
+        }
+        
+        insert_inode_hash(i);
+        return i;
+
+failed_read:
+        ERROR("Unable to read inode [%llx:%x]\n", block, offset);
+
+failed_read1:
+        return NULL;
+}
+
+
+static int read_fragment_index_table(struct super_block *s)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+
+        /* Allocate fragment index table */
+        if (!(msblk->fragment_index = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES
+                                        (sblk->fragments), GFP_KERNEL))) {
+                ERROR("Failed to allocate uid/gid table\n");
+                return 0;
+        }
+   
+        if (SQUASHFS_FRAGMENT_INDEX_BYTES(sblk->fragments) &&
+                                        !squashfs_read_data(s, (char *)
+                                        msblk->fragment_index,
+                                        sblk->fragment_table_start,
+                                        SQUASHFS_FRAGMENT_INDEX_BYTES
+                                        (sblk->fragments) |
+                                        SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+                ERROR("unable to read fragment index table\n");
+                return 0;
+        }
+
+        if (msblk->swap) {
+                int i;
+                long long fragment;
+
+                for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES(sblk->fragments);
+                                                                        i++) {
+                        SQUASHFS_SWAP_FRAGMENT_INDEXES((&fragment),
+                                                &msblk->fragment_index[i], 1);
+                        msblk->fragment_index[i] = fragment;
+                }
+        }
+
+        return 1;
+}
+
+
+static int supported_squashfs_filesystem(struct squashfs_sb_info *msblk, int silent)
+{
+        struct squashfs_super_block *sblk = &msblk->sblk;
+
+        msblk->iget = squashfs_iget;
+        msblk->read_blocklist = read_blocklist;
+        msblk->read_fragment_index_table = read_fragment_index_table;
+
+        if (sblk->s_major == 1) {
+                if (!squashfs_1_0_supported(msblk)) {
+                        SERROR("Major/Minor mismatch, Squashfs 1.0 filesystems "
+                                "are unsupported\n");
+                        SERROR("Please recompile with "
+                                "Squashfs 1.0 support enabled\n");
+                        return 0;
+                }
+        } else if (sblk->s_major == 2) {
+                if (!squashfs_2_0_supported(msblk)) {
+                        SERROR("Major/Minor mismatch, Squashfs 2.0 filesystems "
+                                "are unsupported\n");
+                        SERROR("Please recompile with "
+                                "Squashfs 2.0 support enabled\n");
+                        return 0;
+                }
+        } else if(sblk->s_major != SQUASHFS_MAJOR || sblk->s_minor >
+                        SQUASHFS_MINOR) {
+                SERROR("Major/Minor mismatch, trying to mount newer %d.%d "
+                                "filesystem\n", sblk->s_major, sblk->s_minor);
+                SERROR("Please update your kernel\n");
+                return 0;
+        }
+
+        return 1;
+}
+
+
+static int squashfs_fill_super(struct super_block *s, void *data, int silent)
+{
+        struct squashfs_sb_info *msblk;
+        struct squashfs_super_block *sblk;
+        int i;
+        char b[BDEVNAME_SIZE];
+        struct inode *root;
+
+        TRACE("Entered squashfs_read_superblock\n");
+
+        if (!(s->s_fs_info = kmalloc(sizeof(struct squashfs_sb_info),
+                                                GFP_KERNEL))) {
+                ERROR("Failed to allocate superblock\n");
+                goto failure;
+        }
+        memset(s->s_fs_info, 0, sizeof(struct squashfs_sb_info));
+        msblk = s->s_fs_info;
+        if (!(msblk->stream.workspace = vmalloc(zlib_inflate_workspacesize()))) {
+                ERROR("Failed to allocate zlib workspace\n");
+                goto failure;
+        }
+        sblk = &msblk->sblk;
+        
+        msblk->devblksize = sb_min_blocksize(s, BLOCK_SIZE);
+        msblk->devblksize_log2 = ffz(~msblk->devblksize);
+
+        init_MUTEX(&msblk->read_data_mutex);
+        init_MUTEX(&msblk->read_page_mutex);
+        init_MUTEX(&msblk->block_cache_mutex);
+        init_MUTEX(&msblk->fragment_mutex);
+        init_MUTEX(&msblk->meta_index_mutex);
+        
+        init_waitqueue_head(&msblk->waitq);
+        init_waitqueue_head(&msblk->fragment_wait_queue);
+
+        if (!squashfs_read_data(s, (char *) sblk, SQUASHFS_START,
+                                        sizeof(struct squashfs_super_block) |
+                                        SQUASHFS_COMPRESSED_BIT_BLOCK, 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) {
+                        struct squashfs_super_block ssblk;
+
+                        WARNING("Mounting a different endian SQUASHFS "
+                                "filesystem on %s\n", bdevname(s->s_bdev, b));
+
+                        SQUASHFS_SWAP_SUPER_BLOCK(&ssblk, sblk);
+                        memcpy(sblk, &ssblk, sizeof(struct squashfs_super_block));
+                        msblk->swap = 1;
+                } else  {
+                        SERROR("Can't find a SQUASHFS superblock on %s\n",
+                                                        bdevname(s->s_bdev, b));
+                        goto failed_mount;
+                }
+        }
+
+        /* Check the MAJOR & MINOR versions */
+        if(!supported_squashfs_filesystem(msblk, silent))
+                goto failed_mount;
+
+        TRACE("Found valid superblock on %s\n", bdevname(s->s_bdev, b));
+        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 %lld bytes\n", sblk->bytes_used);
+        TRACE("Block size %d\n", sblk->block_size);
+        TRACE("Number of inodes %d\n", sblk->inodes);
+        if (sblk->s_major > 1)
+                TRACE("Number of fragments %d\n", sblk->fragments);
+        TRACE("Number of uids %d\n", sblk->no_uids);
+        TRACE("Number of gids %d\n", sblk->no_guids);
+        TRACE("sblk->inode_table_start %llx\n", sblk->inode_table_start);
+        TRACE("sblk->directory_table_start %llx\n", sblk->directory_table_start);
+        if (sblk->s_major > 1)
+                TRACE("sblk->fragment_table_start %llx\n",
+                                        sblk->fragment_table_start);
+        TRACE("sblk->uid_start %llx\n", sblk->uid_start);
+
+        s->s_flags |= MS_RDONLY;
+        s->s_op = &squashfs_ops;
+
+        /* Init inode_table block pointer array */
+        if (!(msblk->block_cache = kmalloc(sizeof(struct 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 = kmalloc(msblk->read_size, GFP_KERNEL))) {
+                ERROR("Failed to allocate read_data block\n");
+                goto failed_mount;
+        }
+
+        /* Allocate read_page block */
+        if (!(msblk->read_page = kmalloc(sblk->block_size, GFP_KERNEL))) {
+                ERROR("Failed to allocate read_page block\n");
+                goto failed_mount;
+        }
+
+        /* Allocate uid and gid tables */
+        if (!(msblk->uid = kmalloc((sblk->no_uids + sblk->no_guids) *
+                                        sizeof(unsigned int), GFP_KERNEL))) {
+                ERROR("Failed to allocate uid/gid table\n");
+                goto failed_mount;
+        }
+        msblk->guid = msblk->uid + sblk->no_uids;
+   
+        if (msblk->swap) {
+                unsigned int suid[sblk->no_uids + sblk->no_guids];
+
+                if (!squashfs_read_data(s, (char *) &suid, sblk->uid_start,
+                                        ((sblk->no_uids + sblk->no_guids) *
+                                         sizeof(unsigned int)) |
+                                        SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+                        ERROR("unable to read uid/gid table\n");
+                        goto failed_mount;
+                }
+
+                SQUASHFS_SWAP_DATA(msblk->uid, suid, (sblk->no_uids +
+                        sblk->no_guids), (sizeof(unsigned int) * 8));
+        } else
+                if (!squashfs_read_data(s, (char *) msblk->uid, sblk->uid_start,
+                                        ((sblk->no_uids + sblk->no_guids) *
+                                         sizeof(unsigned int)) |
+                                        SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+                        ERROR("unable to read uid/gid table\n");
+                        goto failed_mount;
+                }
+
+
+        if (sblk->s_major == 1 && squashfs_1_0_supported(msblk))
+                goto allocate_root;
+
+        if (!(msblk->fragment = kmalloc(sizeof(struct squashfs_fragment_cache) *
+                                SQUASHFS_CACHED_FRAGMENTS, GFP_KERNEL))) {
+                ERROR("Failed to allocate fragment block cache\n");
+                goto failed_mount;
+        }
+
+        for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) {
+                msblk->fragment[i].locked = 0;
+                msblk->fragment[i].block = SQUASHFS_INVALID_BLK;
+                msblk->fragment[i].data = NULL;
+        }
+
+        msblk->next_fragment = 0;
+
+        /* Allocate fragment index table */
+        if (msblk->read_fragment_index_table(s) == 0)
+                goto failed_mount;
+
+allocate_root:
+        if ((root = (msblk->iget)(s, sblk->root_inode)) == NULL)
+                goto failed_mount;
+
+        if ((s->s_root = d_alloc_root(root)) == NULL) {
+                ERROR("Root inode create failed\n");
+                iput(root);
+                goto failed_mount;
+        }
+
+        TRACE("Leaving squashfs_read_super\n");
+        return 0;
+
+failed_mount:
+        kfree(msblk->fragment_index);
+        kfree(msblk->fragment);
+        kfree(msblk->uid);
+        kfree(msblk->read_page);
+        kfree(msblk->read_data);
+        kfree(msblk->block_cache);
+        kfree(msblk->fragment_index_2);
+        vfree(msblk->stream.workspace);
+        kfree(s->s_fs_info);
+        s->s_fs_info = NULL;
+        return -EINVAL;
+
+failure:
+        return -ENOMEM;
+}
+
+
+static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+        struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->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;
+        int index = page->index << PAGE_CACHE_SHIFT, length, bytes;
+        long long block = SQUASHFS_I(inode)->start_block;
+        int offset = SQUASHFS_I(inode)->offset;
+        void *pageaddr = kmap(page);
+
+        TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "
+                                "%llx, offset %x\n", page->index,
+                                SQUASHFS_I(inode)->start_block,
+                                SQUASHFS_I(inode)->offset);
+
+        for (length = 0; length < index; length += bytes) {
+                if (!(bytes = squashfs_get_cached_block(inode->i_sb, NULL,
+                                block, offset, PAGE_CACHE_SIZE, &block,
+                                &offset))) {
+                        ERROR("Unable to read symbolic link [%llx:%x]\n", block,
+                                        offset);
+                        goto skip_read;
+                }
+        }
+
+        if (length != index) {
+                ERROR("(squashfs_symlink_readpage) length != index\n");
+                bytes = 0;
+                goto skip_read;
+        }
+
+        bytes = (i_size_read(inode) - length) > PAGE_CACHE_SIZE ? PAGE_CACHE_SIZE :
+                                        i_size_read(inode) - length;
+
+        if (!(bytes = squashfs_get_cached_block(inode->i_sb, pageaddr, block,
+                                        offset, bytes, &block, &offset)))
+                ERROR("Unable to read symbolic link [%llx:%x]\n", block, offset);
+
+skip_read:
+        memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+        kunmap(page);
+        SetPageUptodate(page);
+        unlock_page(page);
+
+        return 0;
+}
+
+
+struct meta_index *locate_meta_index(struct inode *inode, int index, int offset)
+{
+        struct meta_index *meta = NULL;
+        struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+        int i;
+
+        down(&msblk->meta_index_mutex);
+
+        TRACE("locate_meta_index: index %d, offset %d\n", index, offset);
+
+        if(msblk->meta_index == NULL)
+                goto not_allocated;
+
+        for (i = 0; i < SQUASHFS_META_NUMBER; i ++)
+                if (msblk->meta_index[i].inode_number == inode->i_ino &&
+                                msblk->meta_index[i].offset >= offset &&
+                                msblk->meta_index[i].offset <= index &&
+                                msblk->meta_index[i].locked == 0) {
+                        TRACE("locate_meta_index: entry %d, offset %d\n", i,
+                                        msblk->meta_index[i].offset);
+                        meta = &msblk->meta_index[i];
+                        offset = meta->offset;
+                }
+
+        if (meta)
+                meta->locked = 1;
+
+not_allocated:
+        up(&msblk->meta_index_mutex);
+
+        return meta;
+}
+
+
+struct meta_index *empty_meta_index(struct inode *inode, int offset, int skip)
+{
+        struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+        struct meta_index *meta = NULL;
+        int i;
+
+        down(&msblk->meta_index_mutex);
+
+        TRACE("empty_meta_index: offset %d, skip %d\n", offset, skip);
+
+        if(msblk->meta_index == NULL) {
+                if (!(msblk->meta_index = kmalloc(sizeof(struct meta_index) *
+                                        SQUASHFS_META_NUMBER, GFP_KERNEL))) {
+                        ERROR("Failed to allocate meta_index\n");
+                        goto failed;
+                }
+                for(i = 0; i < SQUASHFS_META_NUMBER; i++) {
+                        msblk->meta_index[i].inode_number = 0;
+                        msblk->meta_index[i].locked = 0;
+                }
+                msblk->next_meta_index = 0;
+        }
+
+        for(i = SQUASHFS_META_NUMBER; i &&
+                        msblk->meta_index[msblk->next_meta_index].locked; i --)
+                msblk->next_meta_index = (msblk->next_meta_index + 1) %
+                        SQUASHFS_META_NUMBER;
+
+        if(i == 0) {
+                TRACE("empty_meta_index: failed!\n");
+                goto failed;
+        }
+
+        TRACE("empty_meta_index: returned meta entry %d, %p\n",
+                        msblk->next_meta_index,
+                        &msblk->meta_index[msblk->next_meta_index]);
+
+        meta = &msblk->meta_index[msblk->next_meta_index];
+        msblk->next_meta_index = (msblk->next_meta_index + 1) %
+                        SQUASHFS_META_NUMBER;
+
+        meta->inode_number = inode->i_ino;
+        meta->offset = offset;
+        meta->skip = skip;
+        meta->entries = 0;
+        meta->locked = 1;
+
+failed:
+        up(&msblk->meta_index_mutex);
+        return meta;
+}
+
+
+void release_meta_index(struct inode *inode, struct meta_index *meta)
+{
+        meta->locked = 0;
+}
+
+
+static int read_block_index(struct super_block *s, int blocks, char *block_list,
+                long long *start_block, int *offset)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        unsigned int *block_listp;
+        int block = 0;
+        
+        if (msblk->swap) {
+                char sblock_list[blocks << 2];
+
+                if (!squashfs_get_cached_block(s, sblock_list, *start_block,
+                                *offset, blocks << 2, start_block, offset)) {
+                        ERROR("Unable to read block list [%llx:%x]\n",
+                                *start_block, *offset);
+                        goto failure;
+                }
+                SQUASHFS_SWAP_INTS(((unsigned int *)block_list),
+                                ((unsigned int *)sblock_list), blocks);
+        } else
+                if (!squashfs_get_cached_block(s, block_list, *start_block,
+                                *offset, blocks << 2, start_block, offset)) {
+                        ERROR("Unable to read block list [%llx:%x]\n",
+                                *start_block, *offset);
+                        goto failure;
+                }
+
+        for (block_listp = (unsigned int *) block_list; blocks;
+                                block_listp++, blocks --)
+                block += SQUASHFS_COMPRESSED_SIZE_BLOCK(*block_listp);
+
+        return block;
+
+failure:
+        return -1;
+}
+
+
+#define SIZE 256
+
+static inline int calculate_skip(int blocks) {
+        int skip = (blocks - 1) / ((SQUASHFS_SLOTS * SQUASHFS_META_ENTRIES + 1) * SQUASHFS_META_INDEXES);
+        return skip >= 7 ? 7 : skip + 1;
+}
+
+
+static int get_meta_index(struct inode *inode, int index,
+                long long *index_block, int *index_offset,
+                long long *data_block, char *block_list)
+{
+        struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        int skip = calculate_skip(i_size_read(inode) >> sblk->block_log);
+        int offset = 0;
+        struct meta_index *meta;
+        struct meta_entry *meta_entry;
+        long long cur_index_block = SQUASHFS_I(inode)->u.s1.block_list_start;
+        int cur_offset = SQUASHFS_I(inode)->offset;
+        long long cur_data_block = SQUASHFS_I(inode)->start_block;
+        int i;
+ 
+        index /= SQUASHFS_META_INDEXES * skip;
+
+        while ( offset < index ) {
+                meta = locate_meta_index(inode, index, offset + 1);
+
+                if (meta == NULL) {
+                        if ((meta = empty_meta_index(inode, offset + 1,
+                                                        skip)) == NULL)
+                                goto all_done;
+                } else {
+                        offset = index < meta->offset + meta->entries ? index :
+                                meta->offset + meta->entries - 1;
+                        meta_entry = &meta->meta_entry[offset - meta->offset];
+                        cur_index_block = meta_entry->index_block + sblk->inode_table_start;
+                        cur_offset = meta_entry->offset;
+                        cur_data_block = meta_entry->data_block;
+                        TRACE("get_meta_index: offset %d, meta->offset %d, "
+                                "meta->entries %d\n", offset, meta->offset,
+                                meta->entries);
+                        TRACE("get_meta_index: index_block 0x%llx, offset 0x%x"
+                                " data_block 0x%llx\n", cur_index_block,
+                                cur_offset, cur_data_block);
+                }
+
+                for (i = meta->offset + meta->entries; i <= index &&
+                                i < meta->offset + SQUASHFS_META_ENTRIES; i++) {
+                        int blocks = skip * SQUASHFS_META_INDEXES;
+
+                        while (blocks) {
+                                int block = blocks > (SIZE >> 2) ? (SIZE >> 2) :
+                                        blocks;
+                                int res = read_block_index(inode->i_sb, block,
+                                        block_list, &cur_index_block,
+                                        &cur_offset);
+
+                                if (res == -1)
+                                        goto failed;
+
+                                cur_data_block += res;
+                                blocks -= block;
+                        }
+
+                        meta_entry = &meta->meta_entry[i - meta->offset];
+                        meta_entry->index_block = cur_index_block - sblk->inode_table_start;
+                        meta_entry->offset = cur_offset;
+                        meta_entry->data_block = cur_data_block;
+                        meta->entries ++;
+                        offset ++;
+                }
+
+                TRACE("get_meta_index: meta->offset %d, meta->entries %d\n",
+                                meta->offset, meta->entries);
+
+                release_meta_index(inode, meta);
+        }
+
+all_done:
+        *index_block = cur_index_block;
+        *index_offset = cur_offset;
+        *data_block = cur_data_block;
+
+        return offset * SQUASHFS_META_INDEXES * skip;
+
+failed:
+        release_meta_index(inode, meta);
+        return -1;
+}
+
+
+static long long read_blocklist(struct inode *inode, int index,
+                                int readahead_blks, char *block_list,
+                                unsigned short **block_p, unsigned int *bsize)
+{
+        long long block_ptr;
+        int offset;
+        long long block;
+        int res = get_meta_index(inode, index, &block_ptr, &offset, &block,
+                block_list);
+
+        TRACE("read_blocklist: res %d, index %d, block_ptr 0x%llx, offset"
+                       " 0x%x, block 0x%llx\n", res, index, block_ptr, offset,
+                       block);
+
+        if(res == -1)
+                goto failure;
+
+        index -= res;
+
+        while ( index ) {
+                int blocks = index > (SIZE >> 2) ? (SIZE >> 2) : index;
+                int res = read_block_index(inode->i_sb, blocks, block_list,
+                        &block_ptr, &offset);
+                if (res == -1)
+                        goto failure;
+                block += res;
+                index -= blocks;
+        }
+
+        if (read_block_index(inode->i_sb, 1, block_list,
+                        &block_ptr, &offset) == -1)
+                goto failure;
+        *bsize = *((unsigned int *) block_list);
+
+        return block;
+
+failure:
+        return 0;
+}
+
+
+static int squashfs_readpage(struct file *file, struct page *page)
+{
+        struct inode *inode = page->mapping->host;
+        struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        unsigned char *block_list;
+        long long block;
+        unsigned int bsize, i = 0, bytes = 0, byte_offset = 0;
+        int index = page->index >> (sblk->block_log - PAGE_CACHE_SHIFT);
+        void *pageaddr;
+        struct squashfs_fragment_cache *fragment = NULL;
+        char *data_ptr = msblk->read_page;
+        
+        int mask = (1 << (sblk->block_log - PAGE_CACHE_SHIFT)) - 1;
+        int start_index = page->index & ~mask;
+        int end_index = start_index | mask;
+
+        TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
+                                        page->index,
+                                        SQUASHFS_I(inode)->start_block);
+
+        if (!(block_list = kmalloc(SIZE, GFP_KERNEL))) {
+                ERROR("Failed to allocate block_list\n");
+                goto skip_read;
+        }
+
+        if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
+                                        PAGE_CACHE_SHIFT))
+                goto skip_read;
+
+        if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+                                        || index < (i_size_read(inode) >>
+                                        sblk->block_log)) {
+                if ((block = (msblk->read_blocklist)(inode, index, 1,
+                                        block_list, NULL, &bsize)) == 0)
+                        goto skip_read;
+
+                down(&msblk->read_page_mutex);
+                
+                if (!(bytes = squashfs_read_data(inode->i_sb, msblk->read_page,
+                                        block, bsize, NULL))) {
+                        ERROR("Unable to read page, block %llx, size %x\n", block,
+                                        bsize);
+                        up(&msblk->read_page_mutex);
+                        goto skip_read;
+                }
+        } else {
+                if ((fragment = get_cached_fragment(inode->i_sb,
+                                        SQUASHFS_I(inode)->
+                                        u.s1.fragment_start_block,
+                                        SQUASHFS_I(inode)->u.s1.fragment_size))
+                                        == NULL) {
+                        ERROR("Unable to read page, block %llx, size %x\n",
+                                        SQUASHFS_I(inode)->
+                                        u.s1.fragment_start_block,
+                                        (int) SQUASHFS_I(inode)->
+                                        u.s1.fragment_size);
+                        goto skip_read;
+                }
+                bytes = SQUASHFS_I(inode)->u.s1.fragment_offset +
+                                        (i_size_read(inode) & (sblk->block_size
+                                        - 1));
+                byte_offset = SQUASHFS_I(inode)->u.s1.fragment_offset;
+                data_ptr = fragment->data;
+        }
+
+        for (i = start_index; i <= end_index && byte_offset < bytes;
+                                        i++, byte_offset += PAGE_CACHE_SIZE) {
+                struct page *push_page;
+                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)  {
+                        pageaddr = kmap_atomic(page, KM_USER0);
+                        memcpy(pageaddr, data_ptr + byte_offset,
+                                        available_bytes);
+                        memset(pageaddr + available_bytes, 0,
+                                        PAGE_CACHE_SIZE - available_bytes);
+                        kunmap_atomic(pageaddr, KM_USER0);
+                        flush_dcache_page(page);
+                        SetPageUptodate(page);
+                        unlock_page(page);
+                } else if ((push_page =
+                                grab_cache_page_nowait(page->mapping, i))) {
+                        pageaddr = kmap_atomic(push_page, KM_USER0);
+
+                        memcpy(pageaddr, data_ptr + byte_offset,
+                                        available_bytes);
+                        memset(pageaddr + available_bytes, 0,
+                                        PAGE_CACHE_SIZE - available_bytes);
+                        kunmap_atomic(pageaddr, KM_USER0);
+                        flush_dcache_page(push_page);
+                        SetPageUptodate(push_page);
+                        unlock_page(push_page);
+                        page_cache_release(push_page);
+                }
+        }
+
+        if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+                                        || index < (i_size_read(inode) >>
+                                        sblk->block_log))
+                up(&msblk->read_page_mutex);
+        else
+                release_cached_fragment(msblk, fragment);
+
+        kfree(block_list);
+        return 0;
+
+skip_read:
+        pageaddr = kmap_atomic(page, KM_USER0);
+        memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+        kunmap_atomic(pageaddr, KM_USER0);
+        flush_dcache_page(page);
+        SetPageUptodate(page);
+        unlock_page(page);
+
+        kfree(block_list);
+        return 0;
+}
+
+
+static int squashfs_readpage4K(struct file *file, struct page *page)
+{
+        struct inode *inode = page->mapping->host;
+        struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        unsigned char *block_list;
+        long long block;
+        unsigned int bsize, bytes = 0;
+        void *pageaddr;
+        
+        TRACE("Entered squashfs_readpage4K, page index %lx, start block %llx\n",
+                                        page->index,
+                                        SQUASHFS_I(inode)->start_block);
+
+        if (page->index >= ((i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
+                                        PAGE_CACHE_SHIFT)) {
+                pageaddr = kmap_atomic(page, KM_USER0);
+                block_list = NULL;
+                goto skip_read;
+        }
+
+        if (!(block_list = kmalloc(SIZE, GFP_KERNEL))) {
+                ERROR("Failed to allocate block_list\n");
+                pageaddr = kmap_atomic(page, KM_USER0);
+                block_list = NULL;
+                goto skip_read;
+        }
+
+        if (SQUASHFS_I(inode)->u.s1.fragment_start_block == SQUASHFS_INVALID_BLK
+                                        || page->index < (i_size_read(inode) >>
+                                        sblk->block_log)) {
+                block = (msblk->read_blocklist)(inode, page->index, 1,
+                                        block_list, NULL, &bsize);
+
+                down(&msblk->read_page_mutex);
+                bytes = squashfs_read_data(inode->i_sb, msblk->read_page, block,
+                                        bsize, NULL);
+                pageaddr = kmap_atomic(page, KM_USER0);
+                if (bytes)
+                        memcpy(pageaddr, msblk->read_page, bytes);
+                else
+                        ERROR("Unable to read page, block %llx, size %x\n",
+                                        block, bsize);
+                up(&msblk->read_page_mutex);
+        } else {
+                struct squashfs_fragment_cache *fragment =
+                        get_cached_fragment(inode->i_sb,
+                                        SQUASHFS_I(inode)->
+                                        u.s1.fragment_start_block,
+                                        SQUASHFS_I(inode)-> u.s1.fragment_size);
+                pageaddr = kmap_atomic(page, KM_USER0);
+                if (fragment) {
+                        bytes = i_size_read(inode) & (sblk->block_size - 1);
+                        memcpy(pageaddr, fragment->data + SQUASHFS_I(inode)->
+                                        u.s1.fragment_offset, bytes);
+                        release_cached_fragment(msblk, fragment);
+                } else
+                        ERROR("Unable to read page, block %llx, size %x\n",
+                                        SQUASHFS_I(inode)->
+                                        u.s1.fragment_start_block, (int)
+                                        SQUASHFS_I(inode)-> u.s1.fragment_size);
+        }
+
+skip_read:
+        memset(pageaddr + bytes, 0, PAGE_CACHE_SIZE - bytes);
+        kunmap_atomic(pageaddr, KM_USER0);
+        flush_dcache_page(page);
+        SetPageUptodate(page);
+        unlock_page(page);
+
+        kfree(block_list);
+        return 0;
+}
+
+
+static int get_dir_index_using_offset(struct super_block *s, long long 
+                                *next_block, unsigned int *next_offset,
+                                long long index_start,
+                                unsigned int index_offset, int i_count,
+                                long long f_pos)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        int i, length = 0;
+        struct squashfs_dir_index index;
+
+        TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
+                                        i_count, (unsigned int) f_pos);
+
+        f_pos =- 3;
+        if (f_pos == 0)
+                goto finish;
+
+        for (i = 0; i < i_count; i++) {
+                if (msblk->swap) {
+                        struct squashfs_dir_index sindex;
+                        squashfs_get_cached_block(s, (char *) &sindex,
+                                        index_start, index_offset,
+                                        sizeof(sindex), &index_start,
+                                        &index_offset);
+                        SQUASHFS_SWAP_DIR_INDEX(&index, &sindex);
+                } else
+                        squashfs_get_cached_block(s, (char *) &index,
+                                        index_start, index_offset,
+                                        sizeof(index), &index_start,
+                                        &index_offset);
+
+                if (index.index > f_pos)
+                        break;
+
+                squashfs_get_cached_block(s, NULL, index_start, index_offset,
+                                        index.size + 1, &index_start,
+                                        &index_offset);
+
+                length = index.index;
+                *next_block = index.start_block + sblk->directory_table_start;
+        }
+
+        *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+
+finish:
+        return length + 3;
+}
+
+
+static int get_dir_index_using_name(struct super_block *s, long long
+                                *next_block, unsigned int *next_offset,
+                                long long index_start,
+                                unsigned int index_offset, int i_count,
+                                const char *name, int size)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        int i, length = 0;
+        struct squashfs_dir_index *index;
+        char *str;
+
+        TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+        if (!(str = kmalloc(sizeof(struct squashfs_dir_index) +
+                (SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL))) {
+                ERROR("Failed to allocate squashfs_dir_index\n");
+                goto failure;
+        }
+
+        index = (struct squashfs_dir_index *) (str + SQUASHFS_NAME_LEN + 1);
+        strncpy(str, name, size);
+        str[size] = '\0';
+
+        for (i = 0; i < i_count; i++) {
+                if (msblk->swap) {
+                        struct squashfs_dir_index sindex;
+                        squashfs_get_cached_block(s, (char *) &sindex,
+                                        index_start, index_offset,
+                                        sizeof(sindex), &index_start,
+                                        &index_offset);
+                        SQUASHFS_SWAP_DIR_INDEX(index, &sindex);
+                } else
+                        squashfs_get_cached_block(s, (char *) index,
+                                        index_start, index_offset,
+                                        sizeof(struct squashfs_dir_index),
+                                        &index_start, &index_offset);
+
+                squashfs_get_cached_block(s, index->name, index_start,
+                                        index_offset, index->size + 1,
+                                        &index_start, &index_offset);
+
+                index->name[index->size + 1] = '\0';
+
+                if (strcmp(index->name, str) > 0)
+                        break;
+
+                length = index->index;
+                *next_block = index->start_block + sblk->directory_table_start;
+        }
+
+        *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+        kfree(str);
+failure:
+        return length + 3;
+}
+
+                
+static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+        struct inode *i = file->f_dentry->d_inode;
+        struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        long long next_block = SQUASHFS_I(i)->start_block +
+                sblk->directory_table_start;
+        int next_offset = SQUASHFS_I(i)->offset, length = 0,
+                dir_count;
+        struct squashfs_dir_header dirh;
+        struct squashfs_dir_entry *dire;
+
+        TRACE("Entered squashfs_readdir [%llx:%x]\n", next_block, next_offset);
+
+        if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+                SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+                ERROR("Failed to allocate squashfs_dir_entry\n");
+                goto finish;
+        }
+
+        while(file->f_pos < 3) {
+                char *name;
+                int size, i_ino;
+
+                if(file->f_pos == 0) {
+                        name = ".";
+                        size = 1;
+                        i_ino = i->i_ino;
+                } else {
+                        name = "..";
+                        size = 2;
+                        i_ino = SQUASHFS_I(i)->u.s2.parent_inode;
+                }
+                TRACE("Calling filldir(%x, %s, %d, %d, %d, %d)\n",
+                                (unsigned int) dirent, name, size, (int)
+                                file->f_pos, i_ino,
+                                squashfs_filetype_table[1]);
+
+                if (filldir(dirent, name, size,
+                                file->f_pos, i_ino,
+                                squashfs_filetype_table[1]) < 0) {
+                                TRACE("Filldir returned less than 0\n");
+                                goto finish;
+                }
+                file->f_pos += size;
+        }
+
+        length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_start,
+                                SQUASHFS_I(i)->u.s2.directory_index_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_count,
+                                file->f_pos);
+
+        while (length < i_size_read(i)) {
+                /* read directory header */
+                if (msblk->swap) {
+                        struct squashfs_dir_header sdirh;
+                        
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+                                        next_block, next_offset, sizeof(sdirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(sdirh);
+                        SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+                } else {
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+                                        next_block, next_offset, sizeof(dirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(dirh);
+                }
+
+                dir_count = dirh.count + 1;
+                while (dir_count--) {
+                        if (msblk->swap) {
+                                struct squashfs_dir_entry sdire;
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                &sdire, next_block, next_offset,
+                                                sizeof(sdire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                
+                                length += sizeof(sdire);
+                                SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+                        } else {
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                dire, next_block, next_offset,
+                                                sizeof(*dire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                                length += sizeof(*dire);
+                        }
+
+                        if (!squashfs_get_cached_block(i->i_sb, dire->name,
+                                                next_block, next_offset,
+                                                dire->size + 1, &next_block,
+                                                &next_offset))
+                                goto failed_read;
+
+                        length += dire->size + 1;
+
+                        if (file->f_pos >= length)
+                                continue;
+
+                        dire->name[dire->size + 1] = '\0';
+
+                        TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d, %d)\n",
+                                        (unsigned int) dirent, dire->name,
+                                        dire->size + 1, (int) file->f_pos,
+                                        dirh.start_block, dire->offset,
+                                        dirh.inode_number + dire->inode_number,
+                                        squashfs_filetype_table[dire->type]);
+
+                        if (filldir(dirent, dire->name, dire->size + 1,
+                                        file->f_pos,
+                                        dirh.inode_number + dire->inode_number,
+                                        squashfs_filetype_table[dire->type])
+                                        < 0) {
+                                TRACE("Filldir returned less than 0\n");
+                                goto finish;
+                        }
+                        file->f_pos = length;
+                }
+        }
+
+finish:
+        kfree(dire);
+        return 0;
+
+failed_read:
+        ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+                next_offset);
+        return 0;
+}
+
+
+static struct dentry *squashfs_lookup(struct inode *i, struct dentry *dentry,
+                                struct nameidata *nd)
+{
+        const unsigned char *name = dentry->d_name.name;
+        int len = dentry->d_name.len;
+        struct inode *inode = NULL;
+        struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        long long next_block = SQUASHFS_I(i)->start_block +
+                                sblk->directory_table_start;
+        int next_offset = SQUASHFS_I(i)->offset, length = 0,
+                                dir_count;
+        struct squashfs_dir_header dirh;
+        struct squashfs_dir_entry *dire;
+
+        TRACE("Entered squashfs_lookup [%llx:%x]\n", next_block, next_offset);
+
+        if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+                SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+                ERROR("Failed to allocate squashfs_dir_entry\n");
+                goto exit_loop;
+        }
+
+        if (len > SQUASHFS_NAME_LEN)
+                goto exit_loop;
+
+        length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_start,
+                                SQUASHFS_I(i)->u.s2.directory_index_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_count, name,
+                                len);
+
+        while (length < i_size_read(i)) {
+                /* read directory header */
+                if (msblk->swap) {
+                        struct squashfs_dir_header sdirh;
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+                                        next_block, next_offset, sizeof(sdirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(sdirh);
+                        SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
+                } else {
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+                                        next_block, next_offset, sizeof(dirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(dirh);
+                }
+
+                dir_count = dirh.count + 1;
+                while (dir_count--) {
+                        if (msblk->swap) {
+                                struct squashfs_dir_entry sdire;
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                &sdire, next_block,next_offset,
+                                                sizeof(sdire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                
+                                length += sizeof(sdire);
+                                SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
+                        } else {
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                dire, next_block,next_offset,
+                                                sizeof(*dire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                                length += sizeof(*dire);
+                        }
+
+                        if (!squashfs_get_cached_block(i->i_sb, dire->name,
+                                        next_block, next_offset, dire->size + 1,
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += dire->size + 1;
+
+                        if (name[0] < dire->name[0])
+                                goto exit_loop;
+
+                        if ((len == dire->size + 1) && !strncmp(name,
+                                                dire->name, len)) {
+                                squashfs_inode_t ino =
+                                        SQUASHFS_MKINODE(dirh.start_block,
+                                        dire->offset);
+
+                                TRACE("calling squashfs_iget for directory "
+                                        "entry %s, inode %x:%x, %d\n", name,
+                                        dirh.start_block, dire->offset,
+                                        dirh.inode_number + dire->inode_number);
+
+                                inode = (msblk->iget)(i->i_sb, ino);
+
+                                goto exit_loop;
+                        }
+                }
+        }
+
+exit_loop:
+        kfree(dire);
+        d_add(dentry, inode);
+        return ERR_PTR(0);
+
+failed_read:
+        ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+                next_offset);
+        goto exit_loop;
+}
+
+
+static void squashfs_put_super(struct super_block *s)
+{
+        int i;
+
+        if (s->s_fs_info) {
+                struct squashfs_sb_info *sbi = s->s_fs_info;
+                if (sbi->block_cache)
+                        for (i = 0; i < SQUASHFS_CACHED_BLKS; i++)
+                                if (sbi->block_cache[i].block !=
+                                                        SQUASHFS_INVALID_BLK)
+                                        kfree(sbi->block_cache[i].data);
+                if (sbi->fragment)
+                        for (i = 0; i < SQUASHFS_CACHED_FRAGMENTS; i++) 
+                                SQUASHFS_FREE(sbi->fragment[i].data);
+                kfree(sbi->fragment);
+                kfree(sbi->block_cache);
+                kfree(sbi->read_data);
+                kfree(sbi->read_page);
+                kfree(sbi->uid);
+                kfree(sbi->fragment_index);
+                kfree(sbi->fragment_index_2);
+                kfree(sbi->meta_index);
+                vfree(sbi->stream.workspace);
+                kfree(s->s_fs_info);
+                s->s_fs_info = NULL;
+        }
+}
+
+
+static int squashfs_get_sb(struct file_system_type *fs_type, int flags,
+                                const char *dev_name, void *data,
+                                struct vfsmount *mnt)
+{
+        return get_sb_bdev(fs_type, flags, dev_name, data, squashfs_fill_super,
+                                mnt);
+}
+
+
+static int __init init_squashfs_fs(void)
+{
+        int err = init_inodecache();
+        if (err)
+                goto out;
+
+        printk(KERN_INFO "squashfs: version 3.1 (2006/08/19) "
+                "Phillip Lougher\n");
+
+        if ((err = register_filesystem(&squashfs_fs_type)))
+                destroy_inodecache();
+
+out:
+        return err;
+}
+
+
+static void __exit exit_squashfs_fs(void)
+{
+        unregister_filesystem(&squashfs_fs_type);
+        destroy_inodecache();
+}
+
+
+static kmem_cache_t * squashfs_inode_cachep;
+
+
+static struct inode *squashfs_alloc_inode(struct super_block *sb)
+{
+        struct squashfs_inode_info *ei;
+        ei = kmem_cache_alloc(squashfs_inode_cachep, SLAB_KERNEL);
+        if (!ei)
+                return NULL;
+        return &ei->vfs_inode;
+}
+
+
+static void squashfs_destroy_inode(struct inode *inode)
+{
+        kmem_cache_free(squashfs_inode_cachep, SQUASHFS_I(inode));
+}
+
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+        struct squashfs_inode_info *ei = foo;
+
+        if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+                                                        SLAB_CTOR_CONSTRUCTOR)
+                inode_init_once(&ei->vfs_inode);
+}
+ 
+
+static int __init 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);
+}
+
+
+module_init(init_squashfs_fs);
+module_exit(exit_squashfs_fs);
+MODULE_DESCRIPTION("squashfs 3.1, a compressed read-only filesystem");
+MODULE_AUTHOR("Phillip Lougher <phillip@lougher.org.uk>");
+MODULE_LICENSE("GPL");

fs/squashfs/squashfs.h

@@ +1 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs.h
+ */
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+#undef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+#endif
+
+#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...)      do { \
+                                if (!silent) \
+                                printk(KERN_ERR "SQUASHFS error: "s, ## args);\
+                                } while(0)
+
+#define WARNING(s, args...)     printk(KERN_WARNING "SQUASHFS: "s, ## args)
+
+static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
+{
+        return list_entry(inode, struct squashfs_inode_info, vfs_inode);
+}
+
+#if defined(CONFIG_SQUASHFS_1_0_COMPATIBILITY ) || defined(CONFIG_SQUASHFS_2_0_COMPATIBILITY)
+#define SQSH_EXTERN
+extern unsigned int squashfs_read_data(struct super_block *s, char *buffer,
+                                long long index, unsigned int length,
+                                long long *next_index);
+extern int squashfs_get_cached_block(struct super_block *s, char *buffer,
+                                long long block, unsigned int offset,
+                                int length, long long *next_block,
+                                unsigned int *next_offset);
+extern void release_cached_fragment(struct squashfs_sb_info *msblk, struct
+                                        squashfs_fragment_cache *fragment);
+extern struct squashfs_fragment_cache *get_cached_fragment(struct super_block
+                                        *s, long long start_block,
+                                        int length);
+extern struct address_space_operations squashfs_symlink_aops;
+extern struct address_space_operations squashfs_aops;
+extern struct address_space_operations squashfs_aops_4K;
+extern struct inode_operations squashfs_dir_inode_ops;
+#else
+#define SQSH_EXTERN static
+#endif
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+extern int squashfs_1_0_supported(struct squashfs_sb_info *msblk);
+#else
+static inline int squashfs_1_0_supported(struct squashfs_sb_info *msblk)
+{
+        return 0;
+}
+#endif
+
+#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+extern int squashfs_2_0_supported(struct squashfs_sb_info *msblk);
+#else
+static inline int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
+{
+        return 0;
+}
+#endif

fs/squashfs/squashfs2_0.c

@@ +1 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs2_0.c
+ */
+
+#include <linux/types.h>
+#include <linux/squashfs_fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/zlib.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/squashfs_fs_sb.h>
+#include <linux/squashfs_fs_i.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/init.h>
+#include <linux/dcache.h>
+#include <linux/wait.h>
+#include <linux/zlib.h>
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#include "squashfs.h"
+static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir);
+static struct dentry *squashfs_lookup_2(struct inode *, struct dentry *,
+                                struct nameidata *);
+
+static struct file_operations squashfs_dir_ops_2 = {
+        .read = generic_read_dir,
+        .readdir = squashfs_readdir_2
+};
+
+static struct inode_operations squashfs_dir_inode_ops_2 = {
+        .lookup = squashfs_lookup_2
+};
+
+static unsigned char squashfs_filetype_table[] = {
+        DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK
+};
+
+static int read_fragment_index_table_2(struct super_block *s)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+
+        if (!(msblk->fragment_index_2 = kmalloc(SQUASHFS_FRAGMENT_INDEX_BYTES_2
+                                        (sblk->fragments), GFP_KERNEL))) {
+                ERROR("Failed to allocate uid/gid table\n");
+                return 0;
+        }
+   
+        if (SQUASHFS_FRAGMENT_INDEX_BYTES_2(sblk->fragments) &&
+                                        !squashfs_read_data(s, (char *)
+                                        msblk->fragment_index_2,
+                                        sblk->fragment_table_start,
+                                        SQUASHFS_FRAGMENT_INDEX_BYTES_2
+                                        (sblk->fragments) |
+                                        SQUASHFS_COMPRESSED_BIT_BLOCK, NULL)) {
+                ERROR("unable to read fragment index table\n");
+                return 0;
+        }
+
+        if (msblk->swap) {
+                int i;
+                unsigned int fragment;
+
+                for (i = 0; i < SQUASHFS_FRAGMENT_INDEXES_2(sblk->fragments);
+                                                                        i++) {
+                        SQUASHFS_SWAP_FRAGMENT_INDEXES_2((&fragment),
+                                                &msblk->fragment_index_2[i], 1);
+                        msblk->fragment_index_2[i] = fragment;
+                }
+        }
+
+        return 1;
+}
+
+
+static int get_fragment_location_2(struct super_block *s, unsigned int fragment,
+                                long long *fragment_start_block,
+                                unsigned int *fragment_size)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        long long start_block =
+                msblk->fragment_index_2[SQUASHFS_FRAGMENT_INDEX_2(fragment)];
+        int offset = SQUASHFS_FRAGMENT_INDEX_OFFSET_2(fragment);
+        struct squashfs_fragment_entry_2 fragment_entry;
+
+        if (msblk->swap) {
+                struct squashfs_fragment_entry_2 sfragment_entry;
+
+                if (!squashfs_get_cached_block(s, (char *) &sfragment_entry,
+                                        start_block, offset,
+                                        sizeof(sfragment_entry), &start_block,
+                                        &offset))
+                        goto out;
+                SQUASHFS_SWAP_FRAGMENT_ENTRY_2(&fragment_entry, &sfragment_entry);
+        } else
+                if (!squashfs_get_cached_block(s, (char *) &fragment_entry,
+                                        start_block, offset,
+                                        sizeof(fragment_entry), &start_block,
+                                        &offset))
+                        goto out;
+
+        *fragment_start_block = fragment_entry.start_block;
+        *fragment_size = fragment_entry.size;
+
+        return 1;
+
+out:
+        return 0;
+}
+
+
+static struct inode *squashfs_new_inode(struct super_block *s,
+                struct squashfs_base_inode_header_2 *inodeb, unsigned int ino)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        struct inode *i = new_inode(s);
+
+        if (i) {
+                i->i_ino = ino;
+                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_uid = msblk->uid[inodeb->uid];
+                i->i_mode = inodeb->mode;
+                i->i_nlink = 1;
+                i->i_size = 0;
+                if (inodeb->guid == SQUASHFS_GUIDS)
+                        i->i_gid = i->i_uid;
+                else
+                        i->i_gid = msblk->guid[inodeb->guid];
+        }
+
+        return i;
+}
+
+
+static struct inode *squashfs_iget_2(struct super_block *s, squashfs_inode_t inode)
+{
+        struct inode *i;
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct 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 ino = SQUASHFS_MK_VFS_INODE(block
+                - sblk->inode_table_start, offset);
+        long long next_block;
+        unsigned int next_offset;
+        union squashfs_inode_header_2 id, sid;
+        struct squashfs_base_inode_header_2 *inodeb = &id.base,
+                                          *sinodeb = &sid.base;
+
+        TRACE("Entered squashfs_iget\n");
+
+        if (msblk->swap) {
+                if (!squashfs_get_cached_block(s, (char *) sinodeb, block,
+                                        offset, sizeof(*sinodeb), &next_block,
+                                        &next_offset))
+                        goto failed_read;
+                SQUASHFS_SWAP_BASE_INODE_HEADER_2(inodeb, sinodeb,
+                                        sizeof(*sinodeb));
+        } else
+                if (!squashfs_get_cached_block(s, (char *) inodeb, block,
+                                        offset, sizeof(*inodeb), &next_block,
+                                        &next_offset))
+                        goto failed_read;
+
+        switch(inodeb->inode_type) {
+                case SQUASHFS_FILE_TYPE: {
+                        struct squashfs_reg_inode_header_2 *inodep = &id.reg;
+                        struct squashfs_reg_inode_header_2 *sinodep = &sid.reg;
+                        long long frag_blk;
+                        unsigned int frag_size;
+                                
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_REG_INODE_HEADER_2(inodep, sinodep);
+                        } else
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        frag_blk = SQUASHFS_INVALID_BLK;
+                        if (inodep->fragment != SQUASHFS_INVALID_FRAG &&
+                                        !get_fragment_location_2(s,
+                                        inodep->fragment, &frag_blk, &frag_size))
+                                goto failed_read;
+                                
+                        if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+                                goto failed_read1;
+
+                        i->i_size = inodep->file_size;
+                        i->i_fop = &generic_ro_fops;
+                        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_blocks = ((i->i_size - 1) >> 9) + 1;
+                        SQUASHFS_I(i)->u.s1.fragment_start_block = frag_blk;
+                        SQUASHFS_I(i)->u.s1.fragment_size = frag_size;
+                        SQUASHFS_I(i)->u.s1.fragment_offset = inodep->offset;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->u.s1.block_list_start = next_block;
+                        SQUASHFS_I(i)->offset = next_offset;
+                        if (sblk->block_size > 4096)
+                                i->i_data.a_ops = &squashfs_aops;
+                        else
+                                i->i_data.a_ops = &squashfs_aops_4K;
+
+                        TRACE("File inode %x:%x, start_block %x, "
+                                        "block_list_start %llx, offset %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        inodep->start_block, next_block,
+                                        next_offset);
+                        break;
+                }
+                case SQUASHFS_DIR_TYPE: {
+                        struct squashfs_dir_inode_header_2 *inodep = &id.dir;
+                        struct squashfs_dir_inode_header_2 *sinodep = &sid.dir;
+
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_DIR_INODE_HEADER_2(inodep, sinodep);
+                        } else
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+                                goto failed_read1;
+
+                        i->i_size = inodep->file_size;
+                        i->i_op = &squashfs_dir_inode_ops_2;
+                        i->i_fop = &squashfs_dir_ops_2;
+                        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;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->offset = inodep->offset;
+                        SQUASHFS_I(i)->u.s2.directory_index_count = 0;
+                        SQUASHFS_I(i)->u.s2.parent_inode = 0;
+
+                        TRACE("Directory inode %x:%x, start_block %x, offset "
+                                        "%x\n", SQUASHFS_INODE_BLK(inode),
+                                        offset, inodep->start_block,
+                                        inodep->offset);
+                        break;
+                }
+                case SQUASHFS_LDIR_TYPE: {
+                        struct squashfs_ldir_inode_header_2 *inodep = &id.ldir;
+                        struct squashfs_ldir_inode_header_2 *sinodep = &sid.ldir;
+
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_LDIR_INODE_HEADER_2(inodep,
+                                                sinodep);
+                        } else
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+                                goto failed_read1;
+
+                        i->i_size = inodep->file_size;
+                        i->i_op = &squashfs_dir_inode_ops_2;
+                        i->i_fop = &squashfs_dir_ops_2;
+                        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;
+                        SQUASHFS_I(i)->start_block = inodep->start_block;
+                        SQUASHFS_I(i)->offset = inodep->offset;
+                        SQUASHFS_I(i)->u.s2.directory_index_start = next_block;
+                        SQUASHFS_I(i)->u.s2.directory_index_offset =
+                                                                next_offset;
+                        SQUASHFS_I(i)->u.s2.directory_index_count =
+                                                                inodep->i_count;
+                        SQUASHFS_I(i)->u.s2.parent_inode = 0;
+
+                        TRACE("Long 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: {
+                        struct squashfs_symlink_inode_header_2 *inodep =
+                                                                &id.symlink;
+                        struct squashfs_symlink_inode_header_2 *sinodep =
+                                                                &sid.symlink;
+        
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep,
+                                                                sinodep);
+                        } else
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        if((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+                                goto failed_read1;
+
+                        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;
+                        SQUASHFS_I(i)->start_block = next_block;
+                        SQUASHFS_I(i)->offset = next_offset;
+
+                        TRACE("Symbolic link inode %x:%x, start_block %llx, "
+                                        "offset %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        next_block, next_offset);
+                        break;
+                 }
+                 case SQUASHFS_BLKDEV_TYPE:
+                 case SQUASHFS_CHRDEV_TYPE: {
+                        struct squashfs_dev_inode_header_2 *inodep = &id.dev;
+                        struct squashfs_dev_inode_header_2 *sinodep = &sid.dev;
+
+                        if (msblk->swap) {
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                sinodep, block, offset,
+                                                sizeof(*sinodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, sinodep);
+                        } else  
+                                if (!squashfs_get_cached_block(s, (char *)
+                                                inodep, block, offset,
+                                                sizeof(*inodep), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                        if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+                                goto failed_read1;
+
+                        i->i_mode |= (inodeb->inode_type ==
+                                        SQUASHFS_CHRDEV_TYPE) ?  S_IFCHR :
+                                        S_IFBLK;
+                        init_special_inode(i, i->i_mode,
+                                        old_decode_dev(inodep->rdev));
+
+                        TRACE("Device inode %x:%x, rdev %x\n",
+                                        SQUASHFS_INODE_BLK(inode), offset,
+                                        inodep->rdev);
+                        break;
+                 }
+                 case SQUASHFS_FIFO_TYPE:
+                 case SQUASHFS_SOCKET_TYPE: {
+                        if ((i = squashfs_new_inode(s, inodeb, ino)) == NULL)
+                                goto failed_read1;
+
+                        i->i_mode |= (inodeb->inode_type == SQUASHFS_FIFO_TYPE)
+                                                        ? S_IFIFO : S_IFSOCK;
+                        init_special_inode(i, i->i_mode, 0);
+                        break;
+                 }
+                 default:
+                        ERROR("Unknown inode type %d in squashfs_iget!\n",
+                                        inodeb->inode_type);
+                        goto failed_read1;
+        }
+        
+        insert_inode_hash(i);
+        return i;
+
+failed_read:
+        ERROR("Unable to read inode [%x:%x]\n", block, offset);
+
+failed_read1:
+        return NULL;
+}
+
+
+static int get_dir_index_using_offset(struct super_block *s, long long 
+                                *next_block, unsigned int *next_offset,
+                                long long index_start,
+                                unsigned int index_offset, int i_count,
+                                long long f_pos)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        int i, length = 0;
+        struct squashfs_dir_index_2 index;
+
+        TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %d\n",
+                                        i_count, (unsigned int) f_pos);
+
+        if (f_pos == 0)
+                goto finish;
+
+        for (i = 0; i < i_count; i++) {
+                if (msblk->swap) {
+                        struct squashfs_dir_index_2 sindex;
+                        squashfs_get_cached_block(s, (char *) &sindex,
+                                        index_start, index_offset,
+                                        sizeof(sindex), &index_start,
+                                        &index_offset);
+                        SQUASHFS_SWAP_DIR_INDEX_2(&index, &sindex);
+                } else
+                        squashfs_get_cached_block(s, (char *) &index,
+                                        index_start, index_offset,
+                                        sizeof(index), &index_start,
+                                        &index_offset);
+
+                if (index.index > f_pos)
+                        break;
+
+                squashfs_get_cached_block(s, NULL, index_start, index_offset,
+                                        index.size + 1, &index_start,
+                                        &index_offset);
+
+                length = index.index;
+                *next_block = index.start_block + sblk->directory_table_start;
+        }
+
+        *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+
+finish:
+        return length;
+}
+
+
+static int get_dir_index_using_name(struct super_block *s, long long
+                                *next_block, unsigned int *next_offset,
+                                long long index_start,
+                                unsigned int index_offset, int i_count,
+                                const char *name, int size)
+{
+        struct squashfs_sb_info *msblk = s->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        int i, length = 0;
+        struct squashfs_dir_index_2 *index;
+        char *str;
+
+        TRACE("Entered get_dir_index_using_name, i_count %d\n", i_count);
+
+        if (!(str = kmalloc(sizeof(struct squashfs_dir_index) +
+                (SQUASHFS_NAME_LEN + 1) * 2, GFP_KERNEL))) {
+                ERROR("Failed to allocate squashfs_dir_index\n");
+                goto failure;
+        }
+
+        index = (struct squashfs_dir_index_2 *) (str + SQUASHFS_NAME_LEN + 1);
+        strncpy(str, name, size);
+        str[size] = '\0';
+
+        for (i = 0; i < i_count; i++) {
+                if (msblk->swap) {
+                        struct squashfs_dir_index_2 sindex;
+                        squashfs_get_cached_block(s, (char *) &sindex,
+                                        index_start, index_offset,
+                                        sizeof(sindex), &index_start,
+                                        &index_offset);
+                        SQUASHFS_SWAP_DIR_INDEX_2(index, &sindex);
+                } else
+                        squashfs_get_cached_block(s, (char *) index,
+                                        index_start, index_offset,
+                                        sizeof(struct squashfs_dir_index_2),
+                                        &index_start, &index_offset);
+
+                squashfs_get_cached_block(s, index->name, index_start,
+                                        index_offset, index->size + 1,
+                                        &index_start, &index_offset);
+
+                index->name[index->size + 1] = '\0';
+
+                if (strcmp(index->name, str) > 0)
+                        break;
+
+                length = index->index;
+                *next_block = index->start_block + sblk->directory_table_start;
+        }
+
+        *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE;
+        kfree(str);
+failure:
+        return length;
+}
+
+                
+static int squashfs_readdir_2(struct file *file, void *dirent, filldir_t filldir)
+{
+        struct inode *i = file->f_dentry->d_inode;
+        struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        long long next_block = SQUASHFS_I(i)->start_block +
+                sblk->directory_table_start;
+        int next_offset = SQUASHFS_I(i)->offset, length = 0,
+                dir_count;
+        struct squashfs_dir_header_2 dirh;
+        struct squashfs_dir_entry_2 *dire;
+
+        TRACE("Entered squashfs_readdir_2 [%llx:%x]\n", next_block, next_offset);
+
+        if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+                SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+                ERROR("Failed to allocate squashfs_dir_entry\n");
+                goto finish;
+        }
+
+        length = get_dir_index_using_offset(i->i_sb, &next_block, &next_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_start,
+                                SQUASHFS_I(i)->u.s2.directory_index_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_count,
+                                file->f_pos);
+
+        while (length < i_size_read(i)) {
+                /* read directory header */
+                if (msblk->swap) {
+                        struct squashfs_dir_header_2 sdirh;
+                        
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+                                        next_block, next_offset, sizeof(sdirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(sdirh);
+                        SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+                } else {
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+                                        next_block, next_offset, sizeof(dirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(dirh);
+                }
+
+                dir_count = dirh.count + 1;
+                while (dir_count--) {
+                        if (msblk->swap) {
+                                struct squashfs_dir_entry_2 sdire;
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                &sdire, next_block, next_offset,
+                                                sizeof(sdire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                
+                                length += sizeof(sdire);
+                                SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
+                        } else {
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                dire, next_block, next_offset,
+                                                sizeof(*dire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                                length += sizeof(*dire);
+                        }
+
+                        if (!squashfs_get_cached_block(i->i_sb, dire->name,
+                                                next_block, next_offset,
+                                                dire->size + 1, &next_block,
+                                                &next_offset))
+                                goto failed_read;
+
+                        length += dire->size + 1;
+
+                        if (file->f_pos >= length)
+                                continue;
+
+                        dire->name[dire->size + 1] = '\0';
+
+                        TRACE("Calling filldir(%x, %s, %d, %d, %x:%x, %d)\n",
+                                        (unsigned int) 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");
+                                goto finish;
+                        }
+                        file->f_pos = length;
+                }
+        }
+
+finish:
+        kfree(dire);
+        return 0;
+
+failed_read:
+        ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+                next_offset);
+        kfree(dire);
+        return 0;
+}
+
+
+static struct dentry *squashfs_lookup_2(struct inode *i, struct dentry *dentry,
+                                struct nameidata *nd)
+{
+        const unsigned char *name = dentry->d_name.name;
+        int len = dentry->d_name.len;
+        struct inode *inode = NULL;
+        struct squashfs_sb_info *msblk = i->i_sb->s_fs_info;
+        struct squashfs_super_block *sblk = &msblk->sblk;
+        long long next_block = SQUASHFS_I(i)->start_block +
+                                sblk->directory_table_start;
+        int next_offset = SQUASHFS_I(i)->offset, length = 0,
+                                dir_count;
+        struct squashfs_dir_header_2 dirh;
+        struct squashfs_dir_entry_2 *dire;
+        int sorted = sblk->s_major == 2 && sblk->s_minor >= 1;
+
+        TRACE("Entered squashfs_lookup_2 [%llx:%x]\n", next_block, next_offset);
+
+        if (!(dire = kmalloc(sizeof(struct squashfs_dir_entry) +
+                SQUASHFS_NAME_LEN + 1, GFP_KERNEL))) {
+                ERROR("Failed to allocate squashfs_dir_entry\n");
+                goto exit_loop;
+        }
+
+        if (len > SQUASHFS_NAME_LEN)
+                goto exit_loop;
+
+        length = get_dir_index_using_name(i->i_sb, &next_block, &next_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_start,
+                                SQUASHFS_I(i)->u.s2.directory_index_offset,
+                                SQUASHFS_I(i)->u.s2.directory_index_count, name,
+                                len);
+
+        while (length < i_size_read(i)) {
+                /* read directory header */
+                if (msblk->swap) {
+                        struct squashfs_dir_header_2 sdirh;
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &sdirh,
+                                        next_block, next_offset, sizeof(sdirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(sdirh);
+                        SQUASHFS_SWAP_DIR_HEADER_2(&dirh, &sdirh);
+                } else {
+                        if (!squashfs_get_cached_block(i->i_sb, (char *) &dirh,
+                                        next_block, next_offset, sizeof(dirh),
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += sizeof(dirh);
+                }
+
+                dir_count = dirh.count + 1;
+                while (dir_count--) {
+                        if (msblk->swap) {
+                                struct squashfs_dir_entry_2 sdire;
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                &sdire, next_block,next_offset,
+                                                sizeof(sdire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+                                
+                                length += sizeof(sdire);
+                                SQUASHFS_SWAP_DIR_ENTRY_2(dire, &sdire);
+                        } else {
+                                if (!squashfs_get_cached_block(i->i_sb, (char *)
+                                                dire, next_block,next_offset,
+                                                sizeof(*dire), &next_block,
+                                                &next_offset))
+                                        goto failed_read;
+
+                                length += sizeof(*dire);
+                        }
+
+                        if (!squashfs_get_cached_block(i->i_sb, dire->name,
+                                        next_block, next_offset, dire->size + 1,
+                                        &next_block, &next_offset))
+                                goto failed_read;
+
+                        length += dire->size + 1;
+
+                        if (sorted && name[0] < dire->name[0])
+                                goto exit_loop;
+
+                        if ((len == dire->size + 1) && !strncmp(name,
+                                                dire->name, len)) {
+                                squashfs_inode_t ino =
+                                        SQUASHFS_MKINODE(dirh.start_block,
+                                        dire->offset);
+
+                                TRACE("calling squashfs_iget for directory "
+                                        "entry %s, inode %x:%x, %lld\n", name,
+                                        dirh.start_block, dire->offset, ino);
+
+                                inode = (msblk->iget)(i->i_sb, ino);
+
+                                goto exit_loop;
+                        }
+                }
+        }
+
+exit_loop:
+        kfree(dire);
+        d_add(dentry, inode);
+        return ERR_PTR(0);
+
+failed_read:
+        ERROR("Unable to read directory block [%llx:%x]\n", next_block,
+                next_offset);
+        goto exit_loop;
+}
+
+
+int squashfs_2_0_supported(struct squashfs_sb_info *msblk)
+{
+        struct squashfs_super_block *sblk = &msblk->sblk;
+
+        msblk->iget = squashfs_iget_2;
+        msblk->read_fragment_index_table = read_fragment_index_table_2;
+
+        sblk->bytes_used = sblk->bytes_used_2;
+        sblk->uid_start = sblk->uid_start_2;
+        sblk->guid_start = sblk->guid_start_2;
+        sblk->inode_table_start = sblk->inode_table_start_2;
+        sblk->directory_table_start = sblk->directory_table_start_2;
+        sblk->fragment_table_start = sblk->fragment_table_start_2;
+
+        return 1;
+}

include/linux/squashfs_fs.h

@@ +1 @@
+#ifndef SQUASHFS_FS
+#define SQUASHFS_FS
+
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs_fs.h
+ */
+
+#ifndef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
+#endif
+
+#ifdef  CONFIG_SQUASHFS_VMALLOC
+#define SQUASHFS_ALLOC(a)               vmalloc(a)
+#define SQUASHFS_FREE(a)                vfree(a)
+#else
+#define SQUASHFS_ALLOC(a)               kmalloc(a, GFP_KERNEL)
+#define SQUASHFS_FREE(a)                kfree(a)
+#endif
+#define SQUASHFS_CACHED_FRAGMENTS       CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE     
+#define SQUASHFS_MAJOR                  3
+#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              65536
+#define SQUASHFS_FILE_LOG               16
+
+#define SQUASHFS_FILE_MAX_SIZE          65536
+
+/* Max number of uids and gids */
+#define SQUASHFS_UIDS                   256
+#define SQUASHFS_GUIDS                  255
+
+/* Max length of filename (not 255) */
+#define SQUASHFS_NAME_LEN               256
+
+#define SQUASHFS_INVALID                ((long long) 0xffffffffffff)
+#define SQUASHFS_INVALID_FRAG           ((unsigned int) 0xffffffff)
+#define SQUASHFS_INVALID_BLK            ((long long) -1)
+#define SQUASHFS_USED_BLK               ((long long) -2)
+
+/* Filesystem flags */
+#define SQUASHFS_NOI                    0
+#define SQUASHFS_NOD                    1
+#define SQUASHFS_CHECK                  2
+#define SQUASHFS_NOF                    3
+#define SQUASHFS_NO_FRAG                4
+#define SQUASHFS_ALWAYS_FRAG            5
+#define SQUASHFS_DUPLICATE              6
+
+#define SQUASHFS_BIT(flag, bit)         ((flag >> bit) & 1)
+
+#define SQUASHFS_UNCOMPRESSED_INODES(flags)     SQUASHFS_BIT(flags, \
+                                                SQUASHFS_NOI)
+
+#define SQUASHFS_UNCOMPRESSED_DATA(flags)       SQUASHFS_BIT(flags, \
+                                                SQUASHFS_NOD)
+
+#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags)  SQUASHFS_BIT(flags, \
+                                                SQUASHFS_NOF)
+
+#define SQUASHFS_NO_FRAGMENTS(flags)            SQUASHFS_BIT(flags, \
+                                                SQUASHFS_NO_FRAG)
+
+#define SQUASHFS_ALWAYS_FRAGMENTS(flags)        SQUASHFS_BIT(flags, \
+                                                SQUASHFS_ALWAYS_FRAG)
+
+#define SQUASHFS_DUPLICATES(flags)              SQUASHFS_BIT(flags, \
+                                                SQUASHFS_DUPLICATE)
+
+#define SQUASHFS_CHECK_DATA(flags)              SQUASHFS_BIT(flags, \
+                                                SQUASHFS_CHECK)
+
+#define SQUASHFS_MKFLAGS(noi, nod, check_data, nof, no_frag, always_frag, \
+                duplicate_checking)     (noi | (nod << 1) | (check_data << 2) \
+                | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
+                (duplicate_checking << 6))
+
+/* Max number of types and file types */
+#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
+#define SQUASHFS_FIFO_TYPE              6
+#define SQUASHFS_SOCKET_TYPE            7
+#define SQUASHFS_LDIR_TYPE              8
+#define SQUASHFS_LREG_TYPE              9
+
+/* 1.0 filesystem type definitions */
+#define SQUASHFS_TYPES                  5
+#define SQUASHFS_IPC_TYPE               0
+
+/* 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))
+
+#define SQUASHFS_COMPRESSED_BIT_BLOCK           (1 << 24)
+
+#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)       (((B) & \
+        ~SQUASHFS_COMPRESSED_BIT_BLOCK) ? (B) & \
+        ~SQUASHFS_COMPRESSED_BIT_BLOCK : SQUASHFS_COMPRESSED_BIT_BLOCK)
+
+#define SQUASHFS_COMPRESSED_BLOCK(B)    (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
+
+/*
+ * 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_t)(((squashfs_inode_t) (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))
+/* XXX */
+
+/* Translate between VFS mode and squashfs mode */
+#define SQUASHFS_MODE(a)                ((a) & 0xfff)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES(A)      (A * sizeof(struct squashfs_fragment_entry))
+
+#define SQUASHFS_FRAGMENT_INDEX(A)      (SQUASHFS_FRAGMENT_BYTES(A) / \
+                                        SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)       (SQUASHFS_FRAGMENT_BYTES(A) % \
+                                                SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES(A)    ((SQUASHFS_FRAGMENT_BYTES(A) + \
+                                        SQUASHFS_METADATA_SIZE - 1) / \
+                                        SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES(A)        (SQUASHFS_FRAGMENT_INDEXES(A) *\
+                                                sizeof(long long))
+
+/* cached data constants for filesystem */
+#define SQUASHFS_CACHED_BLKS            8
+
+#define SQUASHFS_MAX_FILE_SIZE_LOG      64
+
+#define SQUASHFS_MAX_FILE_SIZE          ((long long) 1 << \
+                                        (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
+
+#define SQUASHFS_MARKER_BYTE            0xff
+
+/* meta index cache */
+#define SQUASHFS_META_INDEXES   (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
+#define SQUASHFS_META_ENTRIES   31
+#define SQUASHFS_META_NUMBER    8
+#define SQUASHFS_SLOTS          4
+
+struct meta_entry {
+        long long               data_block;
+        unsigned int            index_block;
+        unsigned short          offset;
+        unsigned short          pad;
+};
+
+struct meta_index {
+        unsigned int            inode_number;
+        unsigned int            offset;
+        unsigned short          entries;
+        unsigned short          skip;
+        unsigned short          locked;
+        unsigned short          pad;
+        struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
+};
+
+
+/*
+ * definitions for structures on disk
+ */
+
+typedef long long               squashfs_block_t;
+typedef long long               squashfs_inode_t;
+
+struct squashfs_super_block {
+        unsigned int            s_magic;
+        unsigned int            inodes;
+        unsigned int            bytes_used_2;
+        unsigned int            uid_start_2;
+        unsigned int            guid_start_2;
+        unsigned int            inode_table_start_2;
+        unsigned int            directory_table_start_2;
+        unsigned int            s_major:16;
+        unsigned int            s_minor:16;
+        unsigned int            block_size_1:16;
+        unsigned int            block_log:16;
+        unsigned int            flags:8;
+        unsigned int            no_uids:8;
+        unsigned int            no_guids:8;
+        unsigned int            mkfs_time /* time of filesystem creation */;
+        squashfs_inode_t        root_inode;
+        unsigned int            block_size;
+        unsigned int            fragments;
+        unsigned int            fragment_table_start_2;
+        long long               bytes_used;
+        long long               uid_start;
+        long long               guid_start;
+        long long               inode_table_start;
+        long long               directory_table_start;
+        long long               fragment_table_start;
+        long long               unused;
+} __attribute__ ((packed));
+
+struct squashfs_dir_index {
+        unsigned int            index;
+        unsigned int            start_block;
+        unsigned char           size;
+        unsigned char           name[0];
+} __attribute__ ((packed));
+
+#define SQUASHFS_BASE_INODE_HEADER              \
+        unsigned int            inode_type:4;   \
+        unsigned int            mode:12;        \
+        unsigned int            uid:8;          \
+        unsigned int            guid:8;         \
+        unsigned int            mtime;          \
+        unsigned int            inode_number;
+
+struct squashfs_base_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        unsigned int            nlink;
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        unsigned int            nlink;
+        unsigned short          rdev;
+} __attribute__ ((packed));
+        
+struct squashfs_symlink_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        unsigned int            nlink;
+        unsigned short          symlink_size;
+        char                    symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        squashfs_block_t        start_block;
+        unsigned int            fragment;
+        unsigned int            offset;
+        unsigned int            file_size;
+        unsigned short          block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_lreg_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        unsigned int            nlink;
+        squashfs_block_t        start_block;
+        unsigned int            fragment;
+        unsigned int            offset;
+        long long               file_size;
+        unsigned short          block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        unsigned int            nlink;
+        unsigned int            file_size:19;
+        unsigned int            offset:13;
+        unsigned int            start_block;
+        unsigned int            parent_inode;
+} __attribute__  ((packed));
+
+struct squashfs_ldir_inode_header {
+        SQUASHFS_BASE_INODE_HEADER;
+        unsigned int            nlink;
+        unsigned int            file_size:27;
+        unsigned int            offset:13;
+        unsigned int            start_block;
+        unsigned int            i_count:16;
+        unsigned int            parent_inode;
+        struct squashfs_dir_index       index[0];
+} __attribute__  ((packed));
+
+union squashfs_inode_header {
+        struct squashfs_base_inode_header       base;
+        struct squashfs_dev_inode_header        dev;
+        struct squashfs_symlink_inode_header    symlink;
+        struct squashfs_reg_inode_header        reg;
+        struct squashfs_lreg_inode_header       lreg;
+        struct squashfs_dir_inode_header        dir;
+        struct squashfs_ldir_inode_header       ldir;
+        struct squashfs_ipc_inode_header        ipc;
+};
+        
+struct squashfs_dir_entry {
+        unsigned int            offset:13;
+        unsigned int            type:3;
+        unsigned int            size:8;
+        int                     inode_number:16;
+        char                    name[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_header {
+        unsigned int            count:8;
+        unsigned int            start_block;
+        unsigned int            inode_number;
+} __attribute__ ((packed));
+
+struct squashfs_fragment_entry {
+        long long               start_block;
+        unsigned int            size;
+        unsigned int            unused;
+} __attribute__ ((packed));
+
+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_START \
+        int bits;\
+        int b_pos;\
+        unsigned long long val;\
+        unsigned char *s;\
+        unsigned char *d;
+
+#define SQUASHFS_SWAP_SUPER_BLOCK(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_super_block));\
+        SQUASHFS_SWAP((s)->s_magic, d, 0, 32);\
+        SQUASHFS_SWAP((s)->inodes, d, 32, 32);\
+        SQUASHFS_SWAP((s)->bytes_used_2, d, 64, 32);\
+        SQUASHFS_SWAP((s)->uid_start_2, d, 96, 32);\
+        SQUASHFS_SWAP((s)->guid_start_2, d, 128, 32);\
+        SQUASHFS_SWAP((s)->inode_table_start_2, d, 160, 32);\
+        SQUASHFS_SWAP((s)->directory_table_start_2, d, 192, 32);\
+        SQUASHFS_SWAP((s)->s_major, d, 224, 16);\
+        SQUASHFS_SWAP((s)->s_minor, d, 240, 16);\
+        SQUASHFS_SWAP((s)->block_size_1, 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);\
+        SQUASHFS_SWAP((s)->block_size, d, 408, 32);\
+        SQUASHFS_SWAP((s)->fragments, d, 440, 32);\
+        SQUASHFS_SWAP((s)->fragment_table_start_2, d, 472, 32);\
+        SQUASHFS_SWAP((s)->bytes_used, d, 504, 64);\
+        SQUASHFS_SWAP((s)->uid_start, d, 568, 64);\
+        SQUASHFS_SWAP((s)->guid_start, d, 632, 64);\
+        SQUASHFS_SWAP((s)->inode_table_start, d, 696, 64);\
+        SQUASHFS_SWAP((s)->directory_table_start, d, 760, 64);\
+        SQUASHFS_SWAP((s)->fragment_table_start, d, 824, 64);\
+        SQUASHFS_SWAP((s)->unused, d, 888, 64);\
+}
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE(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, 8);\
+        SQUASHFS_SWAP((s)->guid, d, 24, 8);\
+        SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
+        SQUASHFS_SWAP((s)->inode_number, d, 64, 32);
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER(s, d, n) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_ipc_inode_header))\
+        SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_dev_inode_header)); \
+        SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+        SQUASHFS_SWAP((s)->rdev, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_symlink_inode_header));\
+        SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+        SQUASHFS_SWAP((s)->symlink_size, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_reg_inode_header));\
+        SQUASHFS_SWAP((s)->start_block, d, 96, 64);\
+        SQUASHFS_SWAP((s)->fragment, d, 160, 32);\
+        SQUASHFS_SWAP((s)->offset, d, 192, 32);\
+        SQUASHFS_SWAP((s)->file_size, d, 224, 32);\
+}
+
+#define SQUASHFS_SWAP_LREG_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_lreg_inode_header));\
+        SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+        SQUASHFS_SWAP((s)->start_block, d, 128, 64);\
+        SQUASHFS_SWAP((s)->fragment, d, 192, 32);\
+        SQUASHFS_SWAP((s)->offset, d, 224, 32);\
+        SQUASHFS_SWAP((s)->file_size, d, 256, 64);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_dir_inode_header));\
+        SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+        SQUASHFS_SWAP((s)->file_size, d, 128, 19);\
+        SQUASHFS_SWAP((s)->offset, d, 147, 13);\
+        SQUASHFS_SWAP((s)->start_block, d, 160, 32);\
+        SQUASHFS_SWAP((s)->parent_inode, d, 192, 32);\
+}
+
+#define SQUASHFS_SWAP_LDIR_INODE_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE(s, d, \
+                        sizeof(struct squashfs_ldir_inode_header));\
+        SQUASHFS_SWAP((s)->nlink, d, 96, 32);\
+        SQUASHFS_SWAP((s)->file_size, d, 128, 27);\
+        SQUASHFS_SWAP((s)->offset, d, 155, 13);\
+        SQUASHFS_SWAP((s)->start_block, d, 168, 32);\
+        SQUASHFS_SWAP((s)->i_count, d, 200, 16);\
+        SQUASHFS_SWAP((s)->parent_inode, d, 216, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INDEX(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index));\
+        SQUASHFS_SWAP((s)->index, d, 0, 32);\
+        SQUASHFS_SWAP((s)->start_block, d, 32, 32);\
+        SQUASHFS_SWAP((s)->size, d, 64, 8);\
+}
+
+#define SQUASHFS_SWAP_DIR_HEADER(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header));\
+        SQUASHFS_SWAP((s)->count, d, 0, 8);\
+        SQUASHFS_SWAP((s)->start_block, d, 8, 32);\
+        SQUASHFS_SWAP((s)->inode_number, d, 40, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry));\
+        SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+        SQUASHFS_SWAP((s)->type, d, 13, 3);\
+        SQUASHFS_SWAP((s)->size, d, 16, 8);\
+        SQUASHFS_SWAP((s)->inode_number, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_ENTRY(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry));\
+        SQUASHFS_SWAP((s)->start_block, d, 0, 64);\
+        SQUASHFS_SWAP((s)->size, d, 64, 32);\
+}
+
+#define SQUASHFS_SWAP_SHORTS(s, d, n) {\
+        int entry;\
+        int bit_position;\
+        SQUASHFS_SWAP_START\
+        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_INTS(s, d, n) {\
+        int entry;\
+        int bit_position;\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, n * 4);\
+        for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+                        32)\
+                SQUASHFS_SWAP(s[entry], d, bit_position, 32);\
+}
+
+#define SQUASHFS_SWAP_LONG_LONGS(s, d, n) {\
+        int entry;\
+        int bit_position;\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, n * 8);\
+        for(entry = 0, bit_position = 0; entry < n; entry++, bit_position += \
+                        64)\
+                SQUASHFS_SWAP(s[entry], d, bit_position, 64);\
+}
+
+#define SQUASHFS_SWAP_DATA(s, d, n, bits) {\
+        int entry;\
+        int bit_position;\
+        SQUASHFS_SWAP_START\
+        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);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_INDEXES(s, d, n) SQUASHFS_SWAP_LONG_LONGS(s, d, n)
+
+#ifdef CONFIG_SQUASHFS_1_0_COMPATIBILITY
+
+struct squashfs_base_inode_header_1 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:4; /* index into uid table */
+        unsigned int            guid:4; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header_1 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:4; /* index into uid table */
+        unsigned int            guid:4; /* index into guid table */
+        unsigned int            type:4;
+        unsigned int            offset:4;
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header_1 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:4; /* index into uid table */
+        unsigned int            guid:4; /* index into guid table */
+        unsigned short          rdev;
+} __attribute__ ((packed));
+        
+struct squashfs_symlink_inode_header_1 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:4; /* index into uid table */
+        unsigned int            guid:4; /* index into guid table */
+        unsigned short          symlink_size;
+        char                    symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header_1 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:4; /* index into uid table */
+        unsigned int            guid:4; /* index into guid table */
+        unsigned int            mtime;
+        unsigned int            start_block;
+        unsigned int            file_size:32;
+        unsigned short          block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header_1 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:4; /* index into uid table */
+        unsigned int            guid:4; /* index into guid table */
+        unsigned int            file_size:19;
+        unsigned int            offset:13;
+        unsigned int            mtime;
+        unsigned int            start_block:24;
+} __attribute__  ((packed));
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE_1(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_BASE_INODE_HEADER_1(s, d, n) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER_1(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+                        sizeof(struct squashfs_ipc_inode_header_1));\
+        SQUASHFS_SWAP((s)->type, d, 24, 4);\
+        SQUASHFS_SWAP((s)->offset, d, 28, 4);\
+}
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER_1(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+                        sizeof(struct squashfs_dev_inode_header_1));\
+        SQUASHFS_SWAP((s)->rdev, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_1(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+                        sizeof(struct squashfs_symlink_inode_header_1));\
+        SQUASHFS_SWAP((s)->symlink_size, d, 24, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER_1(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+                        sizeof(struct squashfs_reg_inode_header_1));\
+        SQUASHFS_SWAP((s)->mtime, d, 24, 32);\
+        SQUASHFS_SWAP((s)->start_block, d, 56, 32);\
+        SQUASHFS_SWAP((s)->file_size, d, 88, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER_1(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_1(s, d, \
+                        sizeof(struct squashfs_dir_inode_header_1));\
+        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);\
+}
+
+#endif
+
+#ifdef CONFIG_SQUASHFS_2_0_COMPATIBILITY
+
+struct squashfs_dir_index_2 {
+        unsigned int            index:27;
+        unsigned int            start_block:29;
+        unsigned char           size;
+        unsigned char           name[0];
+} __attribute__ ((packed));
+
+struct squashfs_base_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs_ipc_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+} __attribute__ ((packed));
+
+struct squashfs_dev_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+        unsigned short          rdev;
+} __attribute__ ((packed));
+        
+struct squashfs_symlink_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+        unsigned short          symlink_size;
+        char                    symlink[0];
+} __attribute__ ((packed));
+
+struct squashfs_reg_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+        unsigned int            mtime;
+        unsigned int            start_block;
+        unsigned int            fragment;
+        unsigned int            offset;
+        unsigned int            file_size:32;
+        unsigned short          block_list[0];
+} __attribute__ ((packed));
+
+struct squashfs_dir_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+        unsigned int            file_size:19;
+        unsigned int            offset:13;
+        unsigned int            mtime;
+        unsigned int            start_block:24;
+} __attribute__  ((packed));
+
+struct squashfs_ldir_inode_header_2 {
+        unsigned int            inode_type:4;
+        unsigned int            mode:12; /* protection */
+        unsigned int            uid:8; /* index into uid table */
+        unsigned int            guid:8; /* index into guid table */
+        unsigned int            file_size:27;
+        unsigned int            offset:13;
+        unsigned int            mtime;
+        unsigned int            start_block:24;
+        unsigned int            i_count:16;
+        struct squashfs_dir_index_2     index[0];
+} __attribute__  ((packed));
+
+union squashfs_inode_header_2 {
+        struct squashfs_base_inode_header_2     base;
+        struct squashfs_dev_inode_header_2      dev;
+        struct squashfs_symlink_inode_header_2  symlink;
+        struct squashfs_reg_inode_header_2      reg;
+        struct squashfs_dir_inode_header_2      dir;
+        struct squashfs_ldir_inode_header_2     ldir;
+        struct squashfs_ipc_inode_header_2      ipc;
+};
+        
+struct squashfs_dir_header_2 {
+        unsigned int            count:8;
+        unsigned int            start_block:24;
+} __attribute__ ((packed));
+
+struct squashfs_dir_entry_2 {
+        unsigned int            offset:13;
+        unsigned int            type:3;
+        unsigned int            size:8;
+        char                    name[0];
+} __attribute__ ((packed));
+
+struct squashfs_fragment_entry_2 {
+        unsigned int            start_block;
+        unsigned int            size;
+} __attribute__ ((packed));
+
+#define SQUASHFS_SWAP_BASE_INODE_CORE_2(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, 8);\
+        SQUASHFS_SWAP((s)->guid, d, 24, 8);\
+
+#define SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, n) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, n)\
+}
+
+#define SQUASHFS_SWAP_IPC_INODE_HEADER_2(s, d) \
+        SQUASHFS_SWAP_BASE_INODE_HEADER_2(s, d, sizeof(struct squashfs_ipc_inode_header_2))
+
+#define SQUASHFS_SWAP_DEV_INODE_HEADER_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+                        sizeof(struct squashfs_dev_inode_header_2)); \
+        SQUASHFS_SWAP((s)->rdev, d, 32, 16);\
+}
+
+#define SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+                        sizeof(struct squashfs_symlink_inode_header_2));\
+        SQUASHFS_SWAP((s)->symlink_size, d, 32, 16);\
+}
+
+#define SQUASHFS_SWAP_REG_INODE_HEADER_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+                        sizeof(struct squashfs_reg_inode_header_2));\
+        SQUASHFS_SWAP((s)->mtime, d, 32, 32);\
+        SQUASHFS_SWAP((s)->start_block, d, 64, 32);\
+        SQUASHFS_SWAP((s)->fragment, d, 96, 32);\
+        SQUASHFS_SWAP((s)->offset, d, 128, 32);\
+        SQUASHFS_SWAP((s)->file_size, d, 160, 32);\
+}
+
+#define SQUASHFS_SWAP_DIR_INODE_HEADER_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+                        sizeof(struct squashfs_dir_inode_header_2));\
+        SQUASHFS_SWAP((s)->file_size, d, 32, 19);\
+        SQUASHFS_SWAP((s)->offset, d, 51, 13);\
+        SQUASHFS_SWAP((s)->mtime, d, 64, 32);\
+        SQUASHFS_SWAP((s)->start_block, d, 96, 24);\
+}
+
+#define SQUASHFS_SWAP_LDIR_INODE_HEADER_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_SWAP_BASE_INODE_CORE_2(s, d, \
+                        sizeof(struct squashfs_ldir_inode_header_2));\
+        SQUASHFS_SWAP((s)->file_size, d, 32, 27);\
+        SQUASHFS_SWAP((s)->offset, d, 59, 13);\
+        SQUASHFS_SWAP((s)->mtime, d, 72, 32);\
+        SQUASHFS_SWAP((s)->start_block, d, 104, 24);\
+        SQUASHFS_SWAP((s)->i_count, d, 128, 16);\
+}
+
+#define SQUASHFS_SWAP_DIR_INDEX_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_index_2));\
+        SQUASHFS_SWAP((s)->index, d, 0, 27);\
+        SQUASHFS_SWAP((s)->start_block, d, 27, 29);\
+        SQUASHFS_SWAP((s)->size, d, 56, 8);\
+}
+#define SQUASHFS_SWAP_DIR_HEADER_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_header_2));\
+        SQUASHFS_SWAP((s)->count, d, 0, 8);\
+        SQUASHFS_SWAP((s)->start_block, d, 8, 24);\
+}
+
+#define SQUASHFS_SWAP_DIR_ENTRY_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_dir_entry_2));\
+        SQUASHFS_SWAP((s)->offset, d, 0, 13);\
+        SQUASHFS_SWAP((s)->type, d, 13, 3);\
+        SQUASHFS_SWAP((s)->size, d, 16, 8);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_ENTRY_2(s, d) {\
+        SQUASHFS_SWAP_START\
+        SQUASHFS_MEMSET(s, d, sizeof(struct squashfs_fragment_entry_2));\
+        SQUASHFS_SWAP((s)->start_block, d, 0, 32);\
+        SQUASHFS_SWAP((s)->size, d, 32, 32);\
+}
+
+#define SQUASHFS_SWAP_FRAGMENT_INDEXES_2(s, d, n) SQUASHFS_SWAP_INTS(s, d, n)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES_2(A)    (A * sizeof(struct squashfs_fragment_entry_2))
+
+#define SQUASHFS_FRAGMENT_INDEX_2(A)    (SQUASHFS_FRAGMENT_BYTES_2(A) / \
+                                        SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET_2(A)     (SQUASHFS_FRAGMENT_BYTES_2(A) % \
+                                                SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES_2(A)  ((SQUASHFS_FRAGMENT_BYTES_2(A) + \
+                                        SQUASHFS_METADATA_SIZE - 1) / \
+                                        SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES_2(A)      (SQUASHFS_FRAGMENT_INDEXES_2(A) *\
+                                                sizeof(int))
+
+#endif
+
+#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) {\
+        b_pos = pos % 8;\
+        val = 0;\
+        s = (unsigned char *)p + (pos / 8);\
+        d = ((unsigned char *) &val) + 7;\
+        for(bits = 0; bits < (tbits + b_pos); bits += 8) \
+                *d-- = *s++;\
+        value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
+}
+
+#define SQUASHFS_MEMSET(s, d, n)        memset(s, 0, n);
+
+#endif
+#endif

include/linux/squashfs_fs_i.h

@@ +1 @@
+#ifndef SQUASHFS_FS_I
+#define SQUASHFS_FS_I
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs_fs_i.h
+ */
+
+struct squashfs_inode_info {
+        long long       start_block;
+        unsigned int    offset;
+        union {
+                struct {
+                        long long       fragment_start_block;
+                        unsigned int    fragment_size;
+                        unsigned int    fragment_offset;
+                        long long       block_list_start;
+                } s1;
+                struct {
+                        long long       directory_index_start;
+                        unsigned int    directory_index_offset;
+                        unsigned int    directory_index_count;
+                        unsigned int    parent_inode;
+                } s2;
+        } u;
+        struct inode    vfs_inode;
+};
+#endif

include/linux/squashfs_fs_sb.h

@@ +1 @@
+#ifndef SQUASHFS_FS_SB
+#define SQUASHFS_FS_SB
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006
+ * Phillip Lougher <phillip@lougher.org.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,
+ * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * squashfs_fs_sb.h
+ */
+
+#include <linux/squashfs_fs.h>
+
+struct squashfs_cache {
+        long long       block;
+        int             length;
+        long long       next_index;
+        char            *data;
+};
+
+struct squashfs_fragment_cache {
+        long long       block;
+        int             length;
+        unsigned int    locked;
+        char            *data;
+};
+
+struct squashfs_sb_info {
+        struct squashfs_super_block     sblk;
+        int                     devblksize;
+        int                     devblksize_log2;
+        int                     swap;
+        struct squashfs_cache   *block_cache;
+        struct squashfs_fragment_cache  *fragment;
+        int                     next_cache;
+        int                     next_fragment;
+        int                     next_meta_index;
+        unsigned int            *uid;
+        unsigned int            *guid;
+        long long               *fragment_index;
+        unsigned int            *fragment_index_2;
+        unsigned int            read_size;
+        char                    *read_data;
+        char                    *read_page;
+        struct semaphore        read_data_mutex;
+        struct semaphore        read_page_mutex;
+        struct semaphore        block_cache_mutex;
+        struct semaphore        fragment_mutex;
+        struct semaphore        meta_index_mutex;
+        wait_queue_head_t       waitq;
+        wait_queue_head_t       fragment_wait_queue;
+        struct meta_index       *meta_index;
+        z_stream                stream;
+        struct inode            *(*iget)(struct super_block *s,  squashfs_inode_t
+                                inode);
+        long long               (*read_blocklist)(struct inode *inode, int
+                                index, int readahead_blks, char *block_list,
+                                unsigned short **block_p, unsigned int *bsize);
+        int                     (*read_fragment_index_table)(struct super_block *s);
+};
+#endif

init/do_mounts_rd.c

@@ -5 +5 @@
 #include <linux/ext2_fs.h>
 #include <linux/romfs_fs.h>
 #include <linux/cramfs_fs.h>
+#include <linux/squashfs_fs.h>
 #include <linux/initrd.h>
 #include <linux/string.h>
 
@@ -39 +40 @@
  * numbers could not be found.
  *
  * We currently check for the following magic numbers:
+ *      squashfs
  *      minix
  *      ext2
  *      romfs
@@ -53 +55 @@
         struct ext2_super_block *ext2sb;
         struct romfs_super_block *romfsb;
         struct cramfs_super *cramfsb;
+        struct squashfs_super_block *squashfsb;
         int nblocks = -1;
         unsigned char *buf;
 
@@ -64 +67 @@
         ext2sb = (struct ext2_super_block *) buf;
         romfsb = (struct romfs_super_block *) buf;
         cramfsb = (struct cramfs_super *) buf;
+        squashfsb = (struct squashfs_super_block *) buf;
         memset(buf, 0xe5, size);
 
         /*
@@ -101 +105 @@
                 goto done;
         }
 
+        /* squashfs is at block zero too */
+        if (squashfsb->s_magic == SQUASHFS_MAGIC) {
+                printk(KERN_NOTICE
+                       "RAMDISK: squashfs filesystem found at block %d\n",
+                       start_block);
+                if (squashfsb->s_major < 3)
+                        nblocks = (squashfsb->bytes_used_2+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+                else
+                        nblocks = (squashfsb->bytes_used+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
+                goto done;
+        }
+
         /*
          * Read block 1 to test for minix and ext2 superblock
          */