/*
 * 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;
}
='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>Marc Zyngier &lt;marc.zyngier@arm.com&gt;</td><td class='right'>2017-01-17 16:00:48 +0000</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-30 15:18:56 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/rdma/ib_verbs.h?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>08d85f3ea99f1eeafc4e8507936190e86a16ee8c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/rdma/ib_verbs.h?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/rdma/ib_verbs.h?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>include/rdma/ib_verbs.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/rdma/ib_verbs.h?id=566cf877a1fcb6d6dc0126b076aad062054c2637'>566cf877a1fcb6d6dc0126b076aad062054c2637</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/rdma/ib_verbs.h?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c&amp;id2=566cf877a1fcb6d6dc0126b076aad062054c2637'>diff</a>)</td></tr></table>
<div class='commit-subject'>irqdomain: Avoid activating interrupts more than once</div><div class='commit-msg'>Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are
activated early"), we can end-up activating a PCI/MSI twice (once
at allocation time, and once at startup time).

This is normally of no consequences, except that there is some
HW out there that may misbehave if activate is used more than once
(the GICv3 ITS, for example, uses the activate callback
to issue the MAPVI command, and the architecture spec says that
"If there is an existing mapping for the EventID-DeviceID
combination, behavior is UNPREDICTABLE").

While this could be worked around in each individual driver, it may
make more sense to tackle the issue at the core level. In order to
avoid getting in that situation, let's have a per-interrupt flag
to remember if we have already activated that interrupt or not.

Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early")
Reported-and-tested-by: Andre Przywara &lt;andre.przywara@arm.com&gt;
Signed-off-by: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=08d85f3ea99f1eeafc4e8507936190e86a16ee8c'>Diffstat</a> (limited to 'include/rdma/ib_verbs.h')</div><table summary='diffstat' class='diffstat'>