blob: 7de35bf297aad90d10e27744112a98f2456e388f [file] [log] [blame]
/*
* Squashfs - a compressed read only filesystem for Linux
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
* Phillip Lougher <phillip@squashfs.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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* decompressor.c
*/
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/fs.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "decompressor.h"
#include "squashfs.h"
#include "page_actor.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_lzma_unsupported_comp_ops = {
NULL, NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
};
#ifndef CONFIG_SQUASHFS_LZ4
static const struct squashfs_decompressor squashfs_lz4_comp_ops = {
NULL, NULL, NULL, NULL, LZ4_COMPRESSION, "lz4", 0
};
#endif
#ifndef CONFIG_SQUASHFS_LZO
static const struct squashfs_decompressor squashfs_lzo_comp_ops = {
NULL, NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
};
#endif
#ifndef CONFIG_SQUASHFS_XZ
static const struct squashfs_decompressor squashfs_xz_comp_ops = {
NULL, NULL, NULL, NULL, XZ_COMPRESSION, "xz", 0
};
#endif
#ifndef CONFIG_SQUASHFS_ZLIB
static const struct squashfs_decompressor squashfs_zlib_comp_ops = {
NULL, NULL, NULL, NULL, ZLIB_COMPRESSION, "zlib", 0
};
#endif
static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
NULL, NULL, NULL, NULL, 0, "unknown", 0
};
static const struct squashfs_decompressor *decompressor[] = {
&squashfs_zlib_comp_ops,
&squashfs_lz4_comp_ops,
&squashfs_lzo_comp_ops,
&squashfs_xz_comp_ops,
&squashfs_lzma_unsupported_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];
}
static void *get_comp_opts(struct super_block *sb, unsigned short flags)
{
struct squashfs_sb_info *msblk = sb->s_fs_info;
void *comp_opts, *buffer = NULL;
struct page *page;
struct squashfs_page_actor *actor = NULL;
int length = 0;
if (!SQUASHFS_COMP_OPTS(flags))
return squashfs_comp_opts(msblk, buffer, length);
/*
* Read decompressor specific options from file system if present
*/
page = alloc_page(GFP_KERNEL);
if (!page)
return ERR_PTR(-ENOMEM);
actor = squashfs_page_actor_init(&page, 1, 0, NULL);
if (actor == NULL) {
comp_opts = ERR_PTR(-ENOMEM);
goto actor_error;
}
length = squashfs_read_data(sb,
sizeof(struct squashfs_super_block), 0, NULL, actor);
if (length < 0) {
comp_opts = ERR_PTR(length);
goto read_error;
}
buffer = kmap_atomic(page);
comp_opts = squashfs_comp_opts(msblk, buffer, length);
kunmap_atomic(buffer);
read_error:
squashfs_page_actor_free(actor, 0);
actor_error:
__free_page(page);
return comp_opts;
}
void *squashfs_decompressor_setup(struct super_block *sb, unsigned short flags)
{
struct squashfs_sb_info *msblk = sb->s_fs_info;
void *stream, *comp_opts = get_comp_opts(sb, flags);
if (IS_ERR(comp_opts))
return comp_opts;
stream = squashfs_decompressor_create(msblk, comp_opts);
if (IS_ERR(stream))
kfree(comp_opts);
return stream;
}