diff options
Diffstat (limited to 'target/linux/generic/patches-2.6.31/006-squashfs_add_lzma.patch')
| -rw-r--r-- | target/linux/generic/patches-2.6.31/006-squashfs_add_lzma.patch | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.31/006-squashfs_add_lzma.patch b/target/linux/generic/patches-2.6.31/006-squashfs_add_lzma.patch new file mode 100644 index 0000000000..9fd57970f2 --- /dev/null +++ b/target/linux/generic/patches-2.6.31/006-squashfs_add_lzma.patch @@ -0,0 +1,216 @@ +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; |