/*
 * 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/buffer_head.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 *buffer = NULL, *comp_opts;
	struct squashfs_page_actor *actor = NULL;
	int length = 0;

	/*
	 * Read decompressor specific options from file system if present
	 */
	if (SQUASHFS_COMP_OPTS(flags)) {
		buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
		if (buffer == NULL) {
			comp_opts = ERR_PTR(-ENOMEM);
			goto out;
		}

		actor = squashfs_page_actor_init(&buffer, 1, 0);
		if (actor == NULL) {
			comp_opts = ERR_PTR(-ENOMEM);
			goto out;
		}

		length = squashfs_read_data(sb,
			sizeof(struct squashfs_super_block), 0, NULL, actor);

		if (length < 0) {
			comp_opts = ERR_PTR(length);
			goto out;
		}
	}

	comp_opts = squashfs_comp_opts(msblk, buffer, length);

out:
	kfree(actor);
	kfree(buffer);
	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;
}
ption><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:54:39 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:54:39 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc2/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>883af14e67e8b8702b5560aa64c888c0cd0bd66c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/dwc2/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>74e3a6b53f5fad9f7848ab1b9f6921b7012940a4</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/dwc2/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>drivers/usb/dwc2/Makefile</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc2/Makefile?id=0263d4ebd94b36280608e296cba39b924b6e832b'>0263d4ebd94b36280608e296cba39b924b6e832b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc2/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c&amp;id2=0263d4ebd94b36280608e296cba39b924b6e832b'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc2/Makefile?id=aab45453ff5c77200c6da4ac909f7a4392aed17e'>aab45453ff5c77200c6da4ac909f7a4392aed17e</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc2/Makefile?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c&amp;id2=aab45453ff5c77200c6da4ac909f7a4392aed17e'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'akpm' (patches from Andrew)</div><div class='commit-msg'>Merge fixes from Andrew Morton:
 "26 fixes"

* emailed patches from Andrew Morton &lt;akpm@linux-foundation.org&gt;: (26 commits)
  MAINTAINERS: add Dan Streetman to zbud maintainers
  MAINTAINERS: add Dan Streetman to zswap maintainers
  mm: do not export ioremap_page_range symbol for external module
  mn10300: fix build error of missing fpu_save()
  romfs: use different way to generate fsid for BLOCK or MTD
  frv: add missing atomic64 operations
  mm, page_alloc: fix premature OOM when racing with cpuset mems update
  mm, page_alloc: move cpuset seqcount checking to slowpath
  mm, page_alloc: fix fast-path race with cpuset update or removal
  mm, page_alloc: fix check for NULL preferred_zone
  kernel/panic.c: add missing \n
  fbdev: color map copying bounds checking
  frv: add atomic64_add_unless()
  mm/mempolicy.c: do not put mempolicy before using its nodemask
  radix-tree: fix private list warnings
  Documentation/filesystems/proc.txt: add VmPin
  mm, memcg: do not retry precharge charges
  proc: add a schedule point in proc_pid_readdir()
  mm: alloc_contig: re-allow CMA to compact FS pages
  mm/slub.c: trace free objects at KERN_INFO
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>Diffstat</a> (limited to 'drivers/usb/dwc2/Makefile')</div><table summary='diffstat' class='diffstat'>