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-rw-r--r--target/linux/generic/patches-2.6.33/002-squashfs_factor_out_remaining_zlib.patch317
1 files changed, 317 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.33/002-squashfs_factor_out_remaining_zlib.patch b/target/linux/generic/patches-2.6.33/002-squashfs_factor_out_remaining_zlib.patch
new file mode 100644
index 000000000..eacbb97ae
--- /dev/null
+++ b/target/linux/generic/patches-2.6.33/002-squashfs_factor_out_remaining_zlib.patch
@@ -0,0 +1,317 @@
+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(-)
+
+--- 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"
+--- 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"
+--- 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"
+--- 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"
+--- 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"
+--- 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"
+--- 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"
+--- 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"
+--- 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"
+--- a/fs/squashfs/squashfs.h
++++ b/fs/squashfs/squashfs.h
+@@ -71,6 +71,8 @@ extern struct inode *squashfs_iget(struc
+ 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);
+
+--- 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;
+--- 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 su
+ }
+ 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 su
+ 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;
+ }
+--- 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"
+--- 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_i
+ 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_i
+ 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_i
+ 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);
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