Squashfs 4.0 has official LZMA in the works.
"Re: [Squashfs-devel] squashfs 4.0 lzma support"
According to the author "No, I don't anticipate the format
changing. As far as LZMA is concerned, the format is dictated
by the LZMA code in the kernel".
An updated squashfs-tools with LZMA support will be committed
to OpenEmbedded in a seperate commit.
Signed-off-by: Leon Woestenberg <leon@sidebranch.com>
--- /dev/null
+From 6c4419d997d4431bb62e73475cd6b084e83efbd1 Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Tue, 22 Sep 2009 19:25:24 +0100
+Subject: [PATCH] Squashfs: move zlib decompression wrapper code into a separate file
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/Makefile | 2 +-
+ fs/squashfs/block.c | 74 ++----------------------------
+ fs/squashfs/squashfs.h | 4 ++
+ fs/squashfs/zlib_wrapper.c | 109 ++++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 118 insertions(+), 71 deletions(-)
+
+diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
+index 70e3244..a397e6f 100644
+--- a/fs/squashfs/Makefile
++++ b/fs/squashfs/Makefile
+@@ -4,4 +4,4 @@
+
+ obj-$(CONFIG_SQUASHFS) += squashfs.o
+ squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
+-squashfs-y += namei.o super.o symlink.o
++squashfs-y += namei.o super.o symlink.o zlib_wrapper.o
+diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
+index 2a79603..5cd3934 100644
+--- a/fs/squashfs/block.c
++++ b/fs/squashfs/block.c
+@@ -29,7 +29,6 @@
+ #include <linux/fs.h>
+ #include <linux/vfs.h>
+ #include <linux/slab.h>
+-#include <linux/mutex.h>
+ #include <linux/string.h>
+ #include <linux/buffer_head.h>
+ #include <linux/zlib.h>
+@@ -153,72 +152,10 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
+ }
+
+ if (compressed) {
+- int zlib_err = 0, zlib_init = 0;
+-
+- /*
+- * Uncompress block.
+- */
+-
+- mutex_lock(&msblk->read_data_mutex);
+-
+- msblk->stream.avail_out = 0;
+- msblk->stream.avail_in = 0;
+-
+- bytes = length;
+- do {
+- if (msblk->stream.avail_in == 0 && k < b) {
+- avail = min(bytes, msblk->devblksize - offset);
+- bytes -= avail;
+- wait_on_buffer(bh[k]);
+- if (!buffer_uptodate(bh[k]))
+- goto release_mutex;
+-
+- if (avail == 0) {
+- offset = 0;
+- put_bh(bh[k++]);
+- continue;
+- }
+-
+- msblk->stream.next_in = bh[k]->b_data + offset;
+- msblk->stream.avail_in = avail;
+- offset = 0;
+- }
+-
+- if (msblk->stream.avail_out == 0 && page < pages) {
+- msblk->stream.next_out = buffer[page++];
+- msblk->stream.avail_out = PAGE_CACHE_SIZE;
+- }
+-
+- if (!zlib_init) {
+- zlib_err = zlib_inflateInit(&msblk->stream);
+- if (zlib_err != Z_OK) {
+- ERROR("zlib_inflateInit returned"
+- " unexpected result 0x%x,"
+- " srclength %d\n", zlib_err,
+- srclength);
+- goto release_mutex;
+- }
+- zlib_init = 1;
+- }
+-
+- zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
+-
+- if (msblk->stream.avail_in == 0 && k < b)
+- put_bh(bh[k++]);
+- } while (zlib_err == Z_OK);
+-
+- if (zlib_err != Z_STREAM_END) {
+- ERROR("zlib_inflate error, data probably corrupt\n");
+- goto release_mutex;
+- }
+-
+- zlib_err = zlib_inflateEnd(&msblk->stream);
+- if (zlib_err != Z_OK) {
+- ERROR("zlib_inflate error, data probably corrupt\n");
+- goto release_mutex;
+- }
+- length = msblk->stream.total_out;
+- mutex_unlock(&msblk->read_data_mutex);
++ length = zlib_uncompress(msblk, buffer, bh, b, offset, length,
++ srclength, pages);
++ if (length < 0)
++ goto read_failure;
+ } else {
+ /*
+ * Block is uncompressed.
+@@ -255,9 +192,6 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
+ kfree(bh);
+ return length;
+
+-release_mutex:
+- mutex_unlock(&msblk->read_data_mutex);
+-
+ block_release:
+ for (; k < b; k++)
+ put_bh(bh[k]);
+diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
+index 0e9feb6..988bdce 100644
+--- a/fs/squashfs/squashfs.h
++++ b/fs/squashfs/squashfs.h
+@@ -70,6 +70,10 @@ extern struct inode *squashfs_iget(struct super_block *, long long,
+ unsigned int);
+ extern int squashfs_read_inode(struct inode *, long long);
+
++/* zlib_wrapper.c */
++extern int zlib_uncompress(struct squashfs_sb_info *, void **,
++ struct buffer_head **, int, int, int, int, int);
++
+ /*
+ * Inodes and files operations
+ */
+diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
+new file mode 100644
+index 0000000..486a2a7
+--- /dev/null
++++ b/fs/squashfs/zlib_wrapper.c
+@@ -0,0 +1,109 @@
++/*
++ * Squashfs - a compressed read only filesystem for Linux
++ *
++ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
++ * Phillip Lougher <phillip@lougher.demon.co.uk>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2,
++ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
++ *
++ * zlib_wrapper.c
++ */
++
++
++#include <linux/mutex.h>
++#include <linux/buffer_head.h>
++#include <linux/zlib.h>
++
++#include "squashfs_fs.h"
++#include "squashfs_fs_sb.h"
++#include "squashfs_fs_i.h"
++#include "squashfs.h"
++
++int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
++ struct buffer_head **bh, int b, int offset, int length, int srclength,
++ int pages)
++{
++ int zlib_err = 0, zlib_init = 0;
++ int avail, bytes, k = 0, page = 0;
++
++ mutex_lock(&msblk->read_data_mutex);
++
++ msblk->stream.avail_out = 0;
++ msblk->stream.avail_in = 0;
++
++ bytes = length;
++ do {
++ if (msblk->stream.avail_in == 0 && k < b) {
++ avail = min(bytes, msblk->devblksize - offset);
++ bytes -= avail;
++ wait_on_buffer(bh[k]);
++ if (!buffer_uptodate(bh[k]))
++ goto release_mutex;
++
++ if (avail == 0) {
++ offset = 0;
++ put_bh(bh[k++]);
++ continue;
++ }
++
++ msblk->stream.next_in = bh[k]->b_data + offset;
++ msblk->stream.avail_in = avail;
++ offset = 0;
++ }
++
++ if (msblk->stream.avail_out == 0 && page < pages) {
++ msblk->stream.next_out = buffer[page++];
++ msblk->stream.avail_out = PAGE_CACHE_SIZE;
++ }
++
++ if (!zlib_init) {
++ zlib_err = zlib_inflateInit(&msblk->stream);
++ if (zlib_err != Z_OK) {
++ ERROR("zlib_inflateInit returned unexpected "
++ "result 0x%x, srclength %d\n",
++ zlib_err, srclength);
++ goto release_mutex;
++ }
++ zlib_init = 1;
++ }
++
++ zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
++
++ if (msblk->stream.avail_in == 0 && k < b)
++ put_bh(bh[k++]);
++ } while (zlib_err == Z_OK);
++
++ if (zlib_err != Z_STREAM_END) {
++ ERROR("zlib_inflate error, data probably corrupt\n");
++ goto release_mutex;
++ }
++
++ zlib_err = zlib_inflateEnd(&msblk->stream);
++ if (zlib_err != Z_OK) {
++ ERROR("zlib_inflate error, data probably corrupt\n");
++ goto release_mutex;
++ }
++
++ mutex_unlock(&msblk->read_data_mutex);
++ return msblk->stream.total_out;
++
++release_mutex:
++ mutex_unlock(&msblk->read_data_mutex);
++
++ for (; k < b; k++)
++ put_bh(bh[k]);
++
++ return -EIO;
++}
+--
+1.5.2.5
+
--- /dev/null
+From 37c44e85fd49676ec15ccaeea065662c1fbcda7d Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Wed, 23 Sep 2009 19:04:49 +0100
+Subject: [PATCH] Squashfs: Factor out remaining zlib dependencies into separate wrapper file
+
+Move zlib buffer init/destroy code into separate wrapper file. Also
+make zlib z_stream field a void * removing the need to include zlib.h
+for most files.
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/block.c | 1 -
+ fs/squashfs/cache.c | 1 -
+ fs/squashfs/dir.c | 1 -
+ fs/squashfs/export.c | 1 -
+ fs/squashfs/file.c | 1 -
+ fs/squashfs/fragment.c | 1 -
+ fs/squashfs/id.c | 1 -
+ fs/squashfs/inode.c | 1 -
+ fs/squashfs/namei.c | 1 -
+ fs/squashfs/squashfs.h | 2 +
+ fs/squashfs/squashfs_fs_sb.h | 2 +-
+ fs/squashfs/super.c | 14 +++------
+ fs/squashfs/symlink.c | 1 -
+ fs/squashfs/zlib_wrapper.c | 56 ++++++++++++++++++++++++++++++++---------
+ 14 files changed, 51 insertions(+), 33 deletions(-)
+
+diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
+index 5cd3934..baf7624 100644
+--- a/fs/squashfs/block.c
++++ b/fs/squashfs/block.c
+@@ -31,7 +31,6 @@
+ #include <linux/slab.h>
+ #include <linux/string.h>
+ #include <linux/buffer_head.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
+index 40c98fa..57314be 100644
+--- a/fs/squashfs/cache.c
++++ b/fs/squashfs/cache.c
+@@ -51,7 +51,6 @@
+ #include <linux/sched.h>
+ #include <linux/spinlock.h>
+ #include <linux/wait.h>
+-#include <linux/zlib.h>
+ #include <linux/pagemap.h>
+
+ #include "squashfs_fs.h"
+diff --git a/fs/squashfs/dir.c b/fs/squashfs/dir.c
+index 566b0ea..12b933a 100644
+--- a/fs/squashfs/dir.c
++++ b/fs/squashfs/dir.c
+@@ -30,7 +30,6 @@
+ #include <linux/fs.h>
+ #include <linux/vfs.h>
+ #include <linux/slab.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c
+index 2b1b8fe..7f93d5a 100644
+--- a/fs/squashfs/export.c
++++ b/fs/squashfs/export.c
+@@ -39,7 +39,6 @@
+ #include <linux/vfs.h>
+ #include <linux/dcache.h>
+ #include <linux/exportfs.h>
+-#include <linux/zlib.h>
+ #include <linux/slab.h>
+
+ #include "squashfs_fs.h"
+diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
+index 717767d..a25c506 100644
+--- a/fs/squashfs/file.c
++++ b/fs/squashfs/file.c
+@@ -47,7 +47,6 @@
+ #include <linux/string.h>
+ #include <linux/pagemap.h>
+ #include <linux/mutex.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/fragment.c b/fs/squashfs/fragment.c
+index b5a2c15..7c90bbd 100644
+--- a/fs/squashfs/fragment.c
++++ b/fs/squashfs/fragment.c
+@@ -36,7 +36,6 @@
+ #include <linux/fs.h>
+ #include <linux/vfs.h>
+ #include <linux/slab.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/id.c b/fs/squashfs/id.c
+index 3795b83..b7f64bc 100644
+--- a/fs/squashfs/id.c
++++ b/fs/squashfs/id.c
+@@ -34,7 +34,6 @@
+ #include <linux/fs.h>
+ #include <linux/vfs.h>
+ #include <linux/slab.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
+index 9101dbd..49daaf6 100644
+--- a/fs/squashfs/inode.c
++++ b/fs/squashfs/inode.c
+@@ -40,7 +40,6 @@
+
+ #include <linux/fs.h>
+ #include <linux/vfs.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c
+index 9e39865..5266bd8 100644
+--- a/fs/squashfs/namei.c
++++ b/fs/squashfs/namei.c
+@@ -57,7 +57,6 @@
+ #include <linux/slab.h>
+ #include <linux/string.h>
+ #include <linux/dcache.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
+index 988bdce..b3eaf87 100644
+--- a/fs/squashfs/squashfs.h
++++ b/fs/squashfs/squashfs.h
+@@ -71,6 +71,8 @@ extern struct inode *squashfs_iget(struct super_block *, long long,
+ extern int squashfs_read_inode(struct inode *, long long);
+
+ /* zlib_wrapper.c */
++extern void *zlib_init(void);
++extern void zlib_free(void *);
+ extern int zlib_uncompress(struct squashfs_sb_info *, void **,
+ struct buffer_head **, int, int, int, int, int);
+
+diff --git a/fs/squashfs/squashfs_fs_sb.h b/fs/squashfs/squashfs_fs_sb.h
+index c8c6561..23a67fa 100644
+--- a/fs/squashfs/squashfs_fs_sb.h
++++ b/fs/squashfs/squashfs_fs_sb.h
+@@ -64,7 +64,7 @@ struct squashfs_sb_info {
+ struct mutex read_data_mutex;
+ struct mutex meta_index_mutex;
+ struct meta_index *meta_index;
+- z_stream stream;
++ void *stream;
+ __le64 *inode_lookup_table;
+ u64 inode_table;
+ u64 directory_table;
+diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
+index 6c197ef..6c3429b 100644
+--- a/fs/squashfs/super.c
++++ b/fs/squashfs/super.c
+@@ -35,7 +35,6 @@
+ #include <linux/pagemap.h>
+ #include <linux/init.h>
+ #include <linux/module.h>
+-#include <linux/zlib.h>
+ #include <linux/magic.h>
+
+ #include "squashfs_fs.h"
+@@ -87,12 +86,9 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
+ }
+ msblk = sb->s_fs_info;
+
+- msblk->stream.workspace = kmalloc(zlib_inflate_workspacesize(),
+- GFP_KERNEL);
+- if (msblk->stream.workspace == NULL) {
+- ERROR("Failed to allocate zlib workspace\n");
++ msblk->stream = zlib_init();
++ if (msblk->stream == NULL)
+ goto failure;
+- }
+
+ sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
+ if (sblk == NULL) {
+@@ -292,17 +288,17 @@ failed_mount:
+ squashfs_cache_delete(msblk->block_cache);
+ squashfs_cache_delete(msblk->fragment_cache);
+ squashfs_cache_delete(msblk->read_page);
++ zlib_free(msblk->stream);
+ kfree(msblk->inode_lookup_table);
+ kfree(msblk->fragment_index);
+ kfree(msblk->id_table);
+- kfree(msblk->stream.workspace);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ kfree(sblk);
+ return err;
+
+ failure:
+- kfree(msblk->stream.workspace);
++ zlib_free(msblk->stream);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ return -ENOMEM;
+@@ -346,10 +342,10 @@ static void squashfs_put_super(struct super_block *sb)
+ squashfs_cache_delete(sbi->block_cache);
+ squashfs_cache_delete(sbi->fragment_cache);
+ squashfs_cache_delete(sbi->read_page);
++ zlib_free(sbi->stream);
+ kfree(sbi->id_table);
+ kfree(sbi->fragment_index);
+ kfree(sbi->meta_index);
+- kfree(sbi->stream.workspace);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ }
+diff --git a/fs/squashfs/symlink.c b/fs/squashfs/symlink.c
+index 83d8788..e80be20 100644
+--- a/fs/squashfs/symlink.c
++++ b/fs/squashfs/symlink.c
+@@ -36,7 +36,6 @@
+ #include <linux/slab.h>
+ #include <linux/string.h>
+ #include <linux/pagemap.h>
+-#include <linux/zlib.h>
+
+ #include "squashfs_fs.h"
+ #include "squashfs_fs_sb.h"
+diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
+index 486a2a7..8ebbbc7 100644
+--- a/fs/squashfs/zlib_wrapper.c
++++ b/fs/squashfs/zlib_wrapper.c
+@@ -31,21 +31,51 @@
+ #include "squashfs_fs_i.h"
+ #include "squashfs.h"
+
++void *zlib_init()
++{
++ z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
++ if (stream == NULL)
++ goto failed;
++ stream->workspace = kmalloc(zlib_inflate_workspacesize(),
++ GFP_KERNEL);
++ if (stream->workspace == NULL)
++ goto failed;
++
++ return stream;
++
++failed:
++ ERROR("Failed to allocate zlib workspace\n");
++ kfree(stream);
++ return NULL;
++}
++
++
++void zlib_free(void *strm)
++{
++ z_stream *stream = strm;
++
++ if (stream)
++ kfree(stream->workspace);
++ kfree(stream);
++}
++
++
+ int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+ struct buffer_head **bh, int b, int offset, int length, int srclength,
+ int pages)
+ {
+ int zlib_err = 0, zlib_init = 0;
+ int avail, bytes, k = 0, page = 0;
++ z_stream *stream = msblk->stream;
+
+ mutex_lock(&msblk->read_data_mutex);
+
+- msblk->stream.avail_out = 0;
+- msblk->stream.avail_in = 0;
++ stream->avail_out = 0;
++ stream->avail_in = 0;
+
+ bytes = length;
+ do {
+- if (msblk->stream.avail_in == 0 && k < b) {
++ if (stream->avail_in == 0 && k < b) {
+ avail = min(bytes, msblk->devblksize - offset);
+ bytes -= avail;
+ wait_on_buffer(bh[k]);
+@@ -58,18 +88,18 @@ int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+ continue;
+ }
+
+- msblk->stream.next_in = bh[k]->b_data + offset;
+- msblk->stream.avail_in = avail;
++ stream->next_in = bh[k]->b_data + offset;
++ stream->avail_in = avail;
+ offset = 0;
+ }
+
+- if (msblk->stream.avail_out == 0 && page < pages) {
+- msblk->stream.next_out = buffer[page++];
+- msblk->stream.avail_out = PAGE_CACHE_SIZE;
++ if (stream->avail_out == 0 && page < pages) {
++ stream->next_out = buffer[page++];
++ stream->avail_out = PAGE_CACHE_SIZE;
+ }
+
+ if (!zlib_init) {
+- zlib_err = zlib_inflateInit(&msblk->stream);
++ zlib_err = zlib_inflateInit(stream);
+ if (zlib_err != Z_OK) {
+ ERROR("zlib_inflateInit returned unexpected "
+ "result 0x%x, srclength %d\n",
+@@ -79,9 +109,9 @@ int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+ zlib_init = 1;
+ }
+
+- zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
++ zlib_err = zlib_inflate(stream, Z_SYNC_FLUSH);
+
+- if (msblk->stream.avail_in == 0 && k < b)
++ if (stream->avail_in == 0 && k < b)
+ put_bh(bh[k++]);
+ } while (zlib_err == Z_OK);
+
+@@ -90,14 +120,14 @@ int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+ goto release_mutex;
+ }
+
+- zlib_err = zlib_inflateEnd(&msblk->stream);
++ zlib_err = zlib_inflateEnd(stream);
+ if (zlib_err != Z_OK) {
+ ERROR("zlib_inflate error, data probably corrupt\n");
+ goto release_mutex;
+ }
+
+ mutex_unlock(&msblk->read_data_mutex);
+- return msblk->stream.total_out;
++ return stream->total_out;
+
+ release_mutex:
+ mutex_unlock(&msblk->read_data_mutex);
+--
+1.5.2.5
+
--- /dev/null
+From 327fbf47a419befc6bff74f3ca42d2b6f0841903 Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Tue, 6 Oct 2009 04:04:15 +0100
+Subject: [PATCH] Squashfs: add a decompressor framework
+
+This adds a decompressor framework which allows multiple compression
+algorithms to be cleanly supported.
+
+Also update zlib wrapper and other code to use the new framework.
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/Makefile | 2 +-
+ fs/squashfs/block.c | 6 ++--
+ fs/squashfs/decompressor.c | 58 ++++++++++++++++++++++++++++++++++++++++++
+ fs/squashfs/decompressor.h | 55 +++++++++++++++++++++++++++++++++++++++
+ fs/squashfs/squashfs.h | 14 +++++-----
+ fs/squashfs/squashfs_fs_sb.h | 41 +++++++++++++++--------------
+ fs/squashfs/super.c | 45 ++++++++++++++++++-------------
+ fs/squashfs/zlib_wrapper.c | 17 ++++++++++--
+ 8 files changed, 185 insertions(+), 53 deletions(-)
+
+Index: git/fs/squashfs/Makefile
+===================================================================
+--- git.orig/fs/squashfs/Makefile 2009-10-26 12:19:33.000000000 +0100
++++ git/fs/squashfs/Makefile 2009-10-26 14:25:41.000000000 +0100
+@@ -4,4 +4,4 @@
+
+ obj-$(CONFIG_SQUASHFS) += squashfs.o
+ squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
+-squashfs-y += namei.o super.o symlink.o zlib_wrapper.o
++squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
+Index: git/fs/squashfs/block.c
+===================================================================
+--- git.orig/fs/squashfs/block.c 2009-10-26 12:19:33.000000000 +0100
++++ git/fs/squashfs/block.c 2009-10-26 14:25:41.000000000 +0100
+@@ -36,7 +36,7 @@
+ #include "squashfs_fs_sb.h"
+ #include "squashfs_fs_i.h"
+ #include "squashfs.h"
+-
++#include "decompressor.h"
+ /*
+ * Read the metadata block length, this is stored in the first two
+ * bytes of the metadata block.
+@@ -151,8 +151,8 @@
+ }
+
+ if (compressed) {
+- length = zlib_uncompress(msblk, buffer, bh, b, offset, length,
+- srclength, pages);
++ length = squashfs_decompress(msblk, buffer, bh, b, offset,
++ length, srclength, pages);
+ if (length < 0)
+ goto read_failure;
+ } else {
+Index: git/fs/squashfs/decompressor.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git/fs/squashfs/decompressor.c 2009-10-26 14:25:41.000000000 +0100
+@@ -0,0 +1,58 @@
++/*
++ * Squashfs - a compressed read only filesystem for Linux
++ *
++ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
++ * Phillip Lougher <phillip@lougher.demon.co.uk>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2,
++ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
++ *
++ * decompressor.c
++ */
++
++#include <linux/types.h>
++#include <linux/mutex.h>
++#include <linux/buffer_head.h>
++
++#include "squashfs_fs.h"
++#include "squashfs_fs_sb.h"
++#include "squashfs_fs_i.h"
++#include "decompressor.h"
++#include "squashfs.h"
++
++/*
++ * This file (and decompressor.h) implements a decompressor framework for
++ * Squashfs, allowing multiple decompressors to be easily supported
++ */
++
++static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
++ NULL, NULL, NULL, 0, "unknown", 0
++};
++
++static const struct squashfs_decompressor *decompressor[] = {
++ &squashfs_zlib_comp_ops,
++ &squashfs_unknown_comp_ops
++};
++
++
++const struct squashfs_decompressor *squashfs_lookup_decompressor(int id)
++{
++ int i;
++
++ for (i = 0; decompressor[i]->id; i++)
++ if (id == decompressor[i]->id)
++ break;
++
++ return decompressor[i];
++}
+Index: git/fs/squashfs/decompressor.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git/fs/squashfs/decompressor.h 2009-10-26 14:25:41.000000000 +0100
+@@ -0,0 +1,55 @@
++#ifndef DECOMPRESSOR_H
++#define DECOMPRESSOR_H
++/*
++ * Squashfs - a compressed read only filesystem for Linux
++ *
++ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
++ * Phillip Lougher <phillip@lougher.demon.co.uk>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2,
++ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
++ *
++ * decompressor.h
++ */
++
++struct squashfs_decompressor {
++ void *(*init)(void);
++ void (*free)(void *);
++ int (*decompress)(struct squashfs_sb_info *, void **,
++ struct buffer_head **, int, int, int, int, int);
++ int id;
++ char *name;
++ int supported;
++};
++
++static inline void *squashfs_decompressor_init(struct squashfs_sb_info *msblk)
++{
++ return msblk->decompressor->init();
++}
++
++static inline void squashfs_decompressor_free(struct squashfs_sb_info *msblk,
++ void *s)
++{
++ if (msblk->decompressor)
++ msblk->decompressor->free(s);
++}
++
++static inline int squashfs_decompress(struct squashfs_sb_info *msblk,
++ void **buffer, struct buffer_head **bh, int b, int offset, int length,
++ int srclength, int pages)
++{
++ return msblk->decompressor->decompress(msblk, buffer, bh, b, offset,
++ length, srclength, pages);
++}
++#endif
+Index: git/fs/squashfs/squashfs.h
+===================================================================
+--- git.orig/fs/squashfs/squashfs.h 2009-10-26 12:19:33.000000000 +0100
++++ git/fs/squashfs/squashfs.h 2009-10-26 14:25:41.000000000 +0100
+@@ -51,6 +51,9 @@
+ u64, int);
+ extern int squashfs_read_table(struct super_block *, void *, u64, int);
+
++/* decompressor.c */
++extern const struct squashfs_decompressor *squashfs_lookup_decompressor(int);
++
+ /* export.c */
+ extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64,
+ unsigned int);
+@@ -70,14 +73,8 @@
+ unsigned int);
+ extern int squashfs_read_inode(struct inode *, long long);
+
+-/* zlib_wrapper.c */
+-extern void *zlib_init(void);
+-extern void zlib_free(void *);
+-extern int zlib_uncompress(struct squashfs_sb_info *, void **,
+- struct buffer_head **, int, int, int, int, int);
+-
+ /*
+- * Inodes and files operations
++ * Inodes, files and decompressor operations
+ */
+
+ /* dir.c */
+@@ -94,3 +91,6 @@
+
+ /* symlink.c */
+ extern const struct address_space_operations squashfs_symlink_aops;
++
++/* zlib_wrapper.c */
++extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
+Index: git/fs/squashfs/squashfs_fs_sb.h
+===================================================================
+--- git.orig/fs/squashfs/squashfs_fs_sb.h 2009-10-26 12:19:33.000000000 +0100
++++ git/fs/squashfs/squashfs_fs_sb.h 2009-10-26 14:25:41.000000000 +0100
+@@ -52,25 +52,26 @@
+ };
+
+ struct squashfs_sb_info {
+- int devblksize;
+- int devblksize_log2;
+- struct squashfs_cache *block_cache;
+- struct squashfs_cache *fragment_cache;
+- struct squashfs_cache *read_page;
+- int next_meta_index;
+- __le64 *id_table;
+- __le64 *fragment_index;
+- unsigned int *fragment_index_2;
+- struct mutex read_data_mutex;
+- struct mutex meta_index_mutex;
+- struct meta_index *meta_index;
+- void *stream;
+- __le64 *inode_lookup_table;
+- u64 inode_table;
+- u64 directory_table;
+- unsigned int block_size;
+- unsigned short block_log;
+- long long bytes_used;
+- unsigned int inodes;
++ const struct squashfs_decompressor *decompressor;
++ int devblksize;
++ int devblksize_log2;
++ struct squashfs_cache *block_cache;
++ struct squashfs_cache *fragment_cache;
++ struct squashfs_cache *read_page;
++ int next_meta_index;
++ __le64 *id_table;
++ __le64 *fragment_index;
++ unsigned int *fragment_index_2;
++ struct mutex read_data_mutex;
++ struct mutex meta_index_mutex;
++ struct meta_index *meta_index;
++ void *stream;
++ __le64 *inode_lookup_table;
++ u64 inode_table;
++ u64 directory_table;
++ unsigned int block_size;
++ unsigned short block_log;
++ long long bytes_used;
++ unsigned int inodes;
+ };
+ #endif
+Index: git/fs/squashfs/super.c
+===================================================================
+--- git.orig/fs/squashfs/super.c 2009-10-26 12:19:33.000000000 +0100
++++ git/fs/squashfs/super.c 2009-10-26 14:31:09.000000000 +0100
+@@ -41,27 +41,37 @@
+ #include "squashfs_fs_sb.h"
+ #include "squashfs_fs_i.h"
+ #include "squashfs.h"
++#include "decompressor.h"
+
+ static struct file_system_type squashfs_fs_type;
+ static struct super_operations squashfs_super_ops;
+
+-static int supported_squashfs_filesystem(short major, short minor, short comp)
++
++
++static const struct squashfs_decompressor *supported_squashfs_filesystem(short
++ major, short minor, short id)
+ {
++ const struct squashfs_decompressor *decompressor;
++
+ if (major < SQUASHFS_MAJOR) {
+ ERROR("Major/Minor mismatch, older Squashfs %d.%d "
+ "filesystems are unsupported\n", major, minor);
+- return -EINVAL;
++ return NULL;
+ } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) {
+ ERROR("Major/Minor mismatch, trying to mount newer "
+ "%d.%d filesystem\n", major, minor);
+ ERROR("Please update your kernel\n");
+- return -EINVAL;
++ return NULL;
+ }
+
+- if (comp != ZLIB_COMPRESSION)
+- return -EINVAL;
++ decompressor = squashfs_lookup_decompressor(id);
++ if (!decompressor->supported) {
++ ERROR("Filesystem uses \"%s\" compression. This is not "
++ "supported\n", decompressor->name);
++ return NULL;
++ }
+
+- return 0;
++ return decompressor;
+ }
+
+
+@@ -86,10 +96,6 @@
+ }
+ msblk = sb->s_fs_info;
+
+- msblk->stream = zlib_init();
+- if (msblk->stream == NULL)
+- goto failure;
+-
+ sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
+ if (sblk == NULL) {
+ ERROR("Failed to allocate squashfs_super_block\n");
+@@ -116,25 +122,25 @@
+ goto failed_mount;
+ }
+
++ err = -EINVAL;
++
+ /* Check it is a SQUASHFS superblock */
+ sb->s_magic = le32_to_cpu(sblk->s_magic);
+ if (sb->s_magic != SQUASHFS_MAGIC) {
+ if (!silent)
+ ERROR("Can't find a SQUASHFS superblock on %s\n",
+ bdevname(sb->s_bdev, b));
+- err = -EINVAL;
+ goto failed_mount;
+ }
+
+- /* Check the MAJOR & MINOR versions and compression type */
+- err = supported_squashfs_filesystem(le16_to_cpu(sblk->s_major),
++ /* Check the MAJOR & MINOR versions and lookup compression type */
++ msblk->decompressor = supported_squashfs_filesystem(
++ le16_to_cpu(sblk->s_major),
+ le16_to_cpu(sblk->s_minor),
+ le16_to_cpu(sblk->compression));
+- if (err < 0)
++ if (msblk->decompressor == NULL)
+ goto failed_mount;
+
+- err = -EINVAL;
+-
+ /*
+ * Check if there's xattrs in the filesystem. These are not
+ * supported in this version, so warn that they will be ignored.
+@@ -201,6 +207,10 @@
+
+ err = -ENOMEM;
+
++ msblk->stream = squashfs_decompressor_init(msblk);
++ if (msblk->stream == NULL)
++ goto failed_mount;
++
+ msblk->block_cache = squashfs_cache_init("metadata",
+ SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE);
+ if (msblk->block_cache == NULL)
+@@ -288,7 +298,7 @@
+ squashfs_cache_delete(msblk->block_cache);
+ squashfs_cache_delete(msblk->fragment_cache);
+ squashfs_cache_delete(msblk->read_page);
+- zlib_free(msblk->stream);
++ squashfs_decompressor_free(msblk, msblk->stream);
+ kfree(msblk->inode_lookup_table);
+ kfree(msblk->fragment_index);
+ kfree(msblk->id_table);
+@@ -298,7 +308,6 @@
+ return err;
+
+ failure:
+- zlib_free(msblk->stream);
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+ return -ENOMEM;
+@@ -342,7 +351,7 @@
+ squashfs_cache_delete(sbi->block_cache);
+ squashfs_cache_delete(sbi->fragment_cache);
+ squashfs_cache_delete(sbi->read_page);
+- zlib_free(sbi->stream);
++ squashfs_decompressor_free(sbi, sbi->stream);
+ kfree(sbi->id_table);
+ kfree(sbi->fragment_index);
+ kfree(sbi->meta_index);
+Index: git/fs/squashfs/zlib_wrapper.c
+===================================================================
+--- git.orig/fs/squashfs/zlib_wrapper.c 2009-10-26 12:19:33.000000000 +0100
++++ git/fs/squashfs/zlib_wrapper.c 2009-10-26 14:25:41.000000000 +0100
+@@ -30,8 +30,9 @@
+ #include "squashfs_fs_sb.h"
+ #include "squashfs_fs_i.h"
+ #include "squashfs.h"
++#include "decompressor.h"
+
+-void *zlib_init()
++static void *zlib_init(void)
+ {
+ z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
+ if (stream == NULL)
+@@ -50,7 +51,7 @@
+ }
+
+
+-void zlib_free(void *strm)
++static void zlib_free(void *strm)
+ {
+ z_stream *stream = strm;
+
+@@ -60,7 +61,7 @@
+ }
+
+
+-int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
++static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+ struct buffer_head **bh, int b, int offset, int length, int srclength,
+ int pages)
+ {
+@@ -137,3 +138,13 @@
+
+ return -EIO;
+ }
++
++const struct squashfs_decompressor squashfs_zlib_comp_ops = {
++ .init = zlib_init,
++ .free = zlib_free,
++ .decompress = zlib_uncompress,
++ .id = ZLIB_COMPRESSION,
++ .name = "zlib",
++ .supported = 1
++};
++
--- /dev/null
+From 1885ca0a1973944684f252094a703b7c80dfc974 Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Wed, 14 Oct 2009 03:58:11 +0100
+Subject: [PATCH] Squashfs: add decompressor entries for lzma and lzo
+
+Add knowledge of lzma/lzo compression formats to the decompressor
+framework. For now these are added as unsupported. Without
+these entries lzma/lzo compressed filesystems will be flagged as
+having unknown compression which is undesirable.
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/decompressor.c | 10 ++++++++++
+ fs/squashfs/squashfs_fs.h | 4 +++-
+ 2 files changed, 13 insertions(+), 1 deletions(-)
+
+diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
+index 0072ccd..157478d 100644
+--- a/fs/squashfs/decompressor.c
++++ b/fs/squashfs/decompressor.c
+@@ -36,12 +36,22 @@
+ * Squashfs, allowing multiple decompressors to be easily supported
+ */
+
++static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
++ NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
++};
++
++static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
++ NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
++};
++
+ static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
+ NULL, NULL, NULL, 0, "unknown", 0
+ };
+
+ static const struct squashfs_decompressor *decompressor[] = {
+ &squashfs_zlib_comp_ops,
++ &squashfs_lzma_unsupported_comp_ops,
++ &squashfs_lzo_unsupported_comp_ops,
+ &squashfs_unknown_comp_ops
+ };
+
+diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h
+index 283daaf..36e1604 100644
+--- a/fs/squashfs/squashfs_fs.h
++++ b/fs/squashfs/squashfs_fs.h
+@@ -211,7 +211,9 @@ struct meta_index {
+ /*
+ * definitions for structures on disk
+ */
+-#define ZLIB_COMPRESSION 1
++#define ZLIB_COMPRESSION 1
++#define LZMA_COMPRESSION 2
++#define LZO_COMPRESSION 3
+
+ struct squashfs_super_block {
+ __le32 s_magic;
+--
+1.5.2.5
+
--- /dev/null
+From 5f393ede3ddb5dd4cc2a9f243182fac45f1ce10b Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Wed, 14 Oct 2009 04:07:54 +0100
+Subject: [PATCH] Squashfs: add an extra parameter to the decompressor init function
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/decompressor.h | 4 ++--
+ fs/squashfs/zlib_wrapper.c | 2 +-
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/fs/squashfs/decompressor.h b/fs/squashfs/decompressor.h
+index 778760c..7425f80 100644
+--- a/fs/squashfs/decompressor.h
++++ b/fs/squashfs/decompressor.h
+@@ -24,7 +24,7 @@
+ */
+
+ struct squashfs_decompressor {
+- void *(*init)(void);
++ void *(*init)(struct squashfs_sb_info *);
+ void (*free)(void *);
+ int (*decompress)(struct squashfs_sb_info *, void **,
+ struct buffer_head **, int, int, int, int, int);
+@@ -35,7 +35,7 @@ struct squashfs_decompressor {
+
+ static inline void *squashfs_decompressor_init(struct squashfs_sb_info *msblk)
+ {
+- return msblk->decompressor->init();
++ return msblk->decompressor->init(msblk);
+ }
+
+ static inline void squashfs_decompressor_free(struct squashfs_sb_info *msblk,
+diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
+index 381768c..4dd70e0 100644
+--- a/fs/squashfs/zlib_wrapper.c
++++ b/fs/squashfs/zlib_wrapper.c
+@@ -32,7 +32,7 @@
+ #include "squashfs.h"
+ #include "decompressor.h"
+
+-static void *zlib_init(void)
++static void *zlib_init(struct squashfs_sb_info *dummy)
+ {
+ z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
+ if (stream == NULL)
+--
+1.5.2.5
+
--- /dev/null
+From f49e1efdd179d54e814ff2a8e8f469496583062c Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Tue, 20 Oct 2009 10:54:36 +0100
+Subject: [PATCH] Squashfs: add LZMA compression
+
+Add support for LZMA compressed filesystems. This is an initial
+implementation.
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/Kconfig | 5 ++
+ fs/squashfs/Makefile | 1 +
+ fs/squashfs/decompressor.c | 4 +
+ fs/squashfs/lzma_wrapper.c | 151 ++++++++++++++++++++++++++++++++++++++++++++
+ fs/squashfs/squashfs.h | 3 +
+ 5 files changed, 164 insertions(+), 0 deletions(-)
+
+diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
+index 25a00d1..0294aa2 100644
+--- a/fs/squashfs/Kconfig
++++ b/fs/squashfs/Kconfig
+@@ -26,6 +26,11 @@ config SQUASHFS
+
+ If unsure, say N.
+
++config SQUASHFS_LZMA
++ bool "Include support for LZMA compressed file systems"
++ depends on SQUASHFS
++ select DECOMPRESS_LZMA
++
+ config SQUASHFS_EMBEDDED
+
+ bool "Additional option for memory-constrained systems"
+diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
+index df8a19e..45aaefd 100644
+--- a/fs/squashfs/Makefile
++++ b/fs/squashfs/Makefile
+@@ -5,3 +5,4 @@
+ obj-$(CONFIG_SQUASHFS) += squashfs.o
+ squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
+ squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
++squashfs-$(CONFIG_SQUASHFS_LZMA) += lzma_wrapper.o
+diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
+index 157478d..0b6ad9b 100644
+--- a/fs/squashfs/decompressor.c
++++ b/fs/squashfs/decompressor.c
+@@ -50,7 +50,11 @@ static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
+
+ static const struct squashfs_decompressor *decompressor[] = {
+ &squashfs_zlib_comp_ops,
++#ifdef CONFIG_SQUASHFS_LZMA
++ &squashfs_lzma_comp_ops,
++#else
+ &squashfs_lzma_unsupported_comp_ops,
++#endif
+ &squashfs_lzo_unsupported_comp_ops,
+ &squashfs_unknown_comp_ops
+ };
+diff --git a/fs/squashfs/lzma_wrapper.c b/fs/squashfs/lzma_wrapper.c
+new file mode 100644
+index 0000000..9fa617d
+--- /dev/null
++++ b/fs/squashfs/lzma_wrapper.c
+@@ -0,0 +1,151 @@
++/*
++ * Squashfs - a compressed read only filesystem for Linux
++ *
++ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
++ * Phillip Lougher <phillip@lougher.demon.co.uk>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2,
++ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
++ *
++ * lzma_wrapper.c
++ */
++
++#include <asm/unaligned.h>
++#include <linux/buffer_head.h>
++#include <linux/mutex.h>
++#include <linux/vmalloc.h>
++#include <linux/decompress/unlzma.h>
++
++#include "squashfs_fs.h"
++#include "squashfs_fs_sb.h"
++#include "squashfs_fs_i.h"
++#include "squashfs.h"
++#include "decompressor.h"
++
++struct squashfs_lzma {
++ void *input;
++ void *output;
++};
++
++/* decompress_unlzma.c is currently non re-entrant... */
++DEFINE_MUTEX(lzma_mutex);
++
++/* decompress_unlzma.c doesn't provide any context in its callbacks... */
++static int lzma_error;
++
++static void error(char *m)
++{
++ ERROR("unlzma error: %s\n", m);
++ lzma_error = 1;
++}
++
++
++static void *lzma_init(struct squashfs_sb_info *msblk)
++{
++ struct squashfs_lzma *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
++ if (stream == NULL)
++ goto failed;
++ stream->input = vmalloc(msblk->block_size);
++ if (stream->input == NULL)
++ goto failed;
++ stream->output = vmalloc(msblk->block_size);
++ if (stream->output == NULL)
++ goto failed2;
++
++ return stream;
++
++failed2:
++ vfree(stream->input);
++failed:
++ ERROR("failed to allocate lzma workspace\n");
++ kfree(stream);
++ return NULL;
++}
++
++
++static void lzma_free(void *strm)
++{
++ struct squashfs_lzma *stream = strm;
++
++ if (stream) {
++ vfree(stream->input);
++ vfree(stream->output);
++ }
++ kfree(stream);
++}
++
++
++static int lzma_uncompress(struct squashfs_sb_info *msblk, void **buffer,
++ struct buffer_head **bh, int b, int offset, int length, int srclength,
++ int pages)
++{
++ struct squashfs_lzma *stream = msblk->stream;
++ void *buff = stream->input;
++ int avail, i, bytes = length, res;
++
++ mutex_lock(&lzma_mutex);
++
++ for (i = 0; i < b; i++) {
++ wait_on_buffer(bh[i]);
++ if (!buffer_uptodate(bh[i]))
++ goto block_release;
++
++ avail = min(bytes, msblk->devblksize - offset);
++ memcpy(buff, bh[i]->b_data + offset, avail);
++ buff += avail;
++ bytes -= avail;
++ offset = 0;
++ put_bh(bh[i]);
++ }
++
++ lzma_error = 0;
++ res = unlzma(stream->input, length, NULL, NULL, stream->output, NULL,
++ error);
++ if (res || lzma_error)
++ goto failed;
++
++ /* uncompressed size is stored in the LZMA header (5 byte offset) */
++ res = bytes = get_unaligned_le32(stream->input + 5);
++ for (i = 0, buff = stream->output; bytes && i < pages; i++) {
++ avail = min_t(int, bytes, PAGE_CACHE_SIZE);
++ memcpy(buffer[i], buff, avail);
++ buff += avail;
++ bytes -= avail;
++ }
++ if (bytes)
++ goto failed;
++
++ mutex_unlock(&lzma_mutex);
++ return res;
++
++block_release:
++ for (; i < b; i++)
++ put_bh(bh[i]);
++
++failed:
++ mutex_unlock(&lzma_mutex);
++
++ ERROR("lzma decompression failed, data probably corrupt\n");
++ return -EIO;
++}
++
++const struct squashfs_decompressor squashfs_lzma_comp_ops = {
++ .init = lzma_init,
++ .free = lzma_free,
++ .decompress = lzma_uncompress,
++ .id = LZMA_COMPRESSION,
++ .name = "lzma",
++ .supported = 1
++};
++
+diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
+index fe2587a..d094886 100644
+--- a/fs/squashfs/squashfs.h
++++ b/fs/squashfs/squashfs.h
+@@ -94,3 +94,6 @@ extern const struct address_space_operations squashfs_symlink_aops;
+
+ /* zlib_wrapper.c */
+ extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
++
++/* lzma wrapper.c */
++extern const struct squashfs_decompressor squashfs_lzma_comp_ops;
+--
+1.5.2.5
+
--- /dev/null
+From fdf23ed283bc6ef5c25076ce2065f892120ff556 Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Thu, 22 Oct 2009 04:57:38 +0100
+Subject: [PATCH] Squashfs: Make unlzma available to non initramfs/initrd code
+
+Add a config option DECOMPRESS_LZMA_NEEDED which allows subsystems to
+specify they need the unlzma code. Normally decompress_unlzma.c is
+compiled with __init and unlzma is not exported to modules.
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/Kconfig | 1 +
+ include/linux/decompress/bunzip2_mm.h | 12 ++++++++++++
+ include/linux/decompress/inflate_mm.h | 12 ++++++++++++
+ include/linux/decompress/mm.h | 3 ---
+ include/linux/decompress/unlzma_mm.h | 20 ++++++++++++++++++++
+ lib/Kconfig | 3 +++
+ lib/decompress_bunzip2.c | 1 +
+ lib/decompress_inflate.c | 1 +
+ lib/decompress_unlzma.c | 5 ++++-
+ 9 files changed, 54 insertions(+), 4 deletions(-)
+
+diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
+index 0294aa2..7ec5d7e 100644
+--- a/fs/squashfs/Kconfig
++++ b/fs/squashfs/Kconfig
+@@ -30,6 +30,7 @@ config SQUASHFS_LZMA
+ bool "Include support for LZMA compressed file systems"
+ depends on SQUASHFS
+ select DECOMPRESS_LZMA
++ select DECOMPRESS_LZMA_NEEDED
+
+ config SQUASHFS_EMBEDDED
+
+diff --git a/include/linux/decompress/bunzip2_mm.h b/include/linux/decompress/bunzip2_mm.h
+new file mode 100644
+index 0000000..cac6fef
+--- /dev/null
++++ b/include/linux/decompress/bunzip2_mm.h
+@@ -0,0 +1,12 @@
++#ifndef BUNZIP2_MM_H
++#define BUNZIP2_MM_H
++
++#ifdef STATIC
++/* Code active when included from pre-boot environment: */
++#define INIT
++#else
++/* Compile for initramfs/initrd code only */
++#define INIT __init
++#endif
++
++#endif
+diff --git a/include/linux/decompress/inflate_mm.h b/include/linux/decompress/inflate_mm.h
+new file mode 100644
+index 0000000..ca4a2ae
+--- /dev/null
++++ b/include/linux/decompress/inflate_mm.h
+@@ -0,0 +1,12 @@
++#ifndef INFLATE_MM_H
++#define INFLATE_MM_H
++
++#ifdef STATIC
++/* Code active when included from pre-boot environment: */
++#define INIT
++#else
++/* Compile for initramfs/initrd code only */
++#define INIT __init
++#endif
++
++#endif
+diff --git a/include/linux/decompress/mm.h b/include/linux/decompress/mm.h
+index 12ff8c3..80f5ba4 100644
+--- a/include/linux/decompress/mm.h
++++ b/include/linux/decompress/mm.h
+@@ -53,8 +53,6 @@ static void free(void *where)
+
+ #define set_error_fn(x)
+
+-#define INIT
+-
+ #else /* STATIC */
+
+ /* Code active when compiled standalone for use when loading ramdisk: */
+@@ -77,7 +75,6 @@ static void free(void *where)
+ static void(*error)(char *m);
+ #define set_error_fn(x) error = x;
+
+-#define INIT __init
+ #define STATIC
+
+ #include <linux/init.h>
+diff --git a/include/linux/decompress/unlzma_mm.h b/include/linux/decompress/unlzma_mm.h
+new file mode 100644
+index 0000000..859287e
+--- /dev/null
++++ b/include/linux/decompress/unlzma_mm.h
+@@ -0,0 +1,20 @@
++#ifndef UNLZMA_MM_H
++#define UNLZMA_MM_H
++
++#ifdef STATIC
++
++/* Code active when included from pre-boot environment: */
++#define INIT
++
++#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
++
++/* Make it available to non initramfs/initrd code */
++#define INIT
++#include <linux/module.h>
++#else
++
++/* Compile for initramfs/initrd code only */
++#define INIT __init
++#endif
++
++#endif
+diff --git a/lib/Kconfig b/lib/Kconfig
+index bb1326d..25e7f28 100644
+--- a/lib/Kconfig
++++ b/lib/Kconfig
+@@ -117,6 +117,9 @@ config DECOMPRESS_BZIP2
+ config DECOMPRESS_LZMA
+ tristate
+
++config DECOMPRESS_LZMA_NEEDED
++ boolean
++
+ #
+ # Generic allocator support is selected if needed
+ #
+diff --git a/lib/decompress_bunzip2.c b/lib/decompress_bunzip2.c
+index 600f473..6eb6433 100644
+--- a/lib/decompress_bunzip2.c
++++ b/lib/decompress_bunzip2.c
+@@ -52,6 +52,7 @@
+ #include <linux/slab.h>
+ #endif /* STATIC */
+
++#include <linux/decompress/bunzip2_mm.h>
+ #include <linux/decompress/mm.h>
+
+ #ifndef INT_MAX
+diff --git a/lib/decompress_inflate.c b/lib/decompress_inflate.c
+index fc686c7..cb6bcab 100644
+--- a/lib/decompress_inflate.c
++++ b/lib/decompress_inflate.c
+@@ -23,6 +23,7 @@
+
+ #endif /* STATIC */
+
++#include <linux/decompress/inflate_mm.h>
+ #include <linux/decompress/mm.h>
+
+ #define GZIP_IOBUF_SIZE (16*1024)
+diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
+index ca82fde..b2fd927 100644
+--- a/lib/decompress_unlzma.c
++++ b/lib/decompress_unlzma.c
+@@ -36,6 +36,7 @@
+ #include <linux/slab.h>
+ #endif /* STATIC */
+
++#include <linux/decompress/unlzma_mm.h>
+ #include <linux/decompress/mm.h>
+
+ #define MIN(a, b) (((a) < (b)) ? (a) : (b))
+@@ -531,7 +532,7 @@ static inline void INIT process_bit1(struct writer *wr, struct rc *rc,
+
+
+
+-STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
++STATIC int INIT unlzma(unsigned char *buf, int in_len,
+ int(*fill)(void*, unsigned int),
+ int(*flush)(void*, unsigned int),
+ unsigned char *output,
+@@ -664,4 +665,6 @@ STATIC int INIT decompress(unsigned char *buf, int in_len,
+ {
+ return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn);
+ }
++#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
++EXPORT_SYMBOL(unlzma);
+ #endif
+--
+1.5.2.5
+
require linux.inc
+FILESPATHPKG_prepend = "linux-2.6.31:"
+
# Change MACHINE_KERNEL_PR in conf/machine/include/kirkwood.inc
PV = "2.6.31"
file://defconfig"
SRC_URI_append_openrd-base = " file://openrd-base-enable-pcie.patch;patch=1 \
- file://cpuidle-reenable-interrupts.patch;patch=1"
-
+ file://cpuidle-reenable-interrupts.patch;patch=1 \
+ file://0001-Squashfs-move-zlib-decompression-wrapper-code-into.patch;patch=1 \
+ file://0002-Squashfs-Factor-out-remaining-zlib-dependencies-int.patch;patch=1 \
+ file://0003-Squashfs-add-a-decompressor-framework.patch;patch=1 \
+ file://0004-Squashfs-add-decompressor-entries-for-lzma-and-lzo.patch;patch=1 \
+ file://0005-Squashfs-add-an-extra-parameter-to-the-decompressor.patch;patch=1 \
+ file://0006-Squashfs-add-LZMA-compression.patch;patch=1 \
+ file://0007-Squashfs-Make-unlzma-available-to-non-initramfs-ini.patch;patch=1 \
+ "
# update machine types list for ARM architecture, only for machines that need it
do_arm_mach_types() {
if test ${MACHINE} == openrd-base; then
require linux.inc
-PR = "r5"
+PR = "r6"
S = "${WORKDIR}/linux-${PV}"
${KERNELORG_MIRROR}/pub/linux/kernel/v2.6/patch-${PV}.5.bz2;patch=1 \
file://defconfig"
+SRC_URI += "file://0001-Squashfs-move-zlib-decompression-wrapper-code-into.patch;patch=1 \
+ file://0002-Squashfs-Factor-out-remaining-zlib-dependencies-int.patch;patch=1 \
+ file://0003-Squashfs-add-a-decompressor-framework.patch;patch=1 \
+ file://0004-Squashfs-add-decompressor-entries-for-lzma-and-lzo.patch;patch=1 \
+ file://0005-Squashfs-add-an-extra-parameter-to-the-decompressor.patch;patch=1 \
+ file://0006-Squashfs-add-LZMA-compression.patch;patch=1 \
+ file://0007-Squashfs-Make-unlzma-available-to-non-initramfs-ini.patch;patch=1 \
+ "
+
SRC_URI_append_db1200 ="\
http://maxim.org.za/AT91RM9200/2.6/2.6.31-at91.patch.gz;patch=1 \
"
git.openpandora.org / openembedded.git / commitdiff