mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-08-22 04:13:41 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21952 3c298f89-4303-0410-b956-a3cf2f4a3e73
217 lines
5.7 KiB
Diff
217 lines
5.7 KiB
Diff
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(-)
|
|
create mode 100644 fs/squashfs/lzma_wrapper.c
|
|
|
|
--- 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"
|
|
--- 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
|
|
--- a/fs/squashfs/decompressor.c
|
|
+++ b/fs/squashfs/decompressor.c
|
|
@@ -50,7 +50,11 @@ static const struct squashfs_decompresso
|
|
|
|
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
|
|
};
|
|
--- /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
|
|
+};
|
|
+
|
|
--- a/fs/squashfs/squashfs.h
|
|
+++ b/fs/squashfs/squashfs.h
|
|
@@ -94,3 +94,6 @@ extern const struct address_space_operat
|
|
|
|
/* zlib_wrapper.c */
|
|
extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
|
|
+
|
|
+/* lzma wrapper.c */
|
|
+extern const struct squashfs_decompressor squashfs_lzma_comp_ops;
|