120c8ccb1SThomas Gleixner// SPDX-License-Identifier: GPL-2.0-only
29508c6b9SPhillip Lougher/*
39508c6b9SPhillip Lougher * Copyright (c) 2013
49508c6b9SPhillip Lougher * Phillip Lougher <phillip@squashfs.org.uk>
59508c6b9SPhillip Lougher */
69508c6b9SPhillip Lougher
79508c6b9SPhillip Lougher#include <linux/types.h>
89508c6b9SPhillip Lougher#include <linux/mutex.h>
99508c6b9SPhillip Lougher#include <linux/slab.h>
1093e72b3cSPhilippe Liard#include <linux/bio.h>
119508c6b9SPhillip Lougher
129508c6b9SPhillip Lougher#include "squashfs_fs.h"
139508c6b9SPhillip Lougher#include "squashfs_fs_sb.h"
149508c6b9SPhillip Lougher#include "decompressor.h"
159508c6b9SPhillip Lougher#include "squashfs.h"
169508c6b9SPhillip Lougher
179508c6b9SPhillip Lougher/*
189508c6b9SPhillip Lougher * This file implements single-threaded decompression in the
199508c6b9SPhillip Lougher * decompressor framework
209508c6b9SPhillip Lougher */
219508c6b9SPhillip Lougher
229508c6b9SPhillip Lougherstruct squashfs_stream {
239508c6b9SPhillip Lougher	void		*stream;
249508c6b9SPhillip Lougher	struct mutex	mutex;
259508c6b9SPhillip Lougher};
269508c6b9SPhillip Lougher
279508c6b9SPhillip Loughervoid *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
289508c6b9SPhillip Lougher						void *comp_opts)
299508c6b9SPhillip Lougher{
309508c6b9SPhillip Lougher	struct squashfs_stream *stream;
319508c6b9SPhillip Lougher	int err = -ENOMEM;
329508c6b9SPhillip Lougher
339508c6b9SPhillip Lougher	stream = kmalloc(sizeof(*stream), GFP_KERNEL);
349508c6b9SPhillip Lougher	if (stream == NULL)
359508c6b9SPhillip Lougher		goto out;
369508c6b9SPhillip Lougher
379508c6b9SPhillip Lougher	stream->stream = msblk->decompressor->init(msblk, comp_opts);
389508c6b9SPhillip Lougher	if (IS_ERR(stream->stream)) {
399508c6b9SPhillip Lougher		err = PTR_ERR(stream->stream);
409508c6b9SPhillip Lougher		goto out;
419508c6b9SPhillip Lougher	}
429508c6b9SPhillip Lougher
439508c6b9SPhillip Lougher	kfree(comp_opts);
449508c6b9SPhillip Lougher	mutex_init(&stream->mutex);
459508c6b9SPhillip Lougher	return stream;
469508c6b9SPhillip Lougher
479508c6b9SPhillip Lougherout:
489508c6b9SPhillip Lougher	kfree(stream);
499508c6b9SPhillip Lougher	return ERR_PTR(err);
509508c6b9SPhillip Lougher}
519508c6b9SPhillip Lougher
529508c6b9SPhillip Loughervoid squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
539508c6b9SPhillip Lougher{
549508c6b9SPhillip Lougher	struct squashfs_stream *stream = msblk->stream;
559508c6b9SPhillip Lougher
569508c6b9SPhillip Lougher	if (stream) {
579508c6b9SPhillip Lougher		msblk->decompressor->free(stream->stream);
589508c6b9SPhillip Lougher		kfree(stream);
599508c6b9SPhillip Lougher	}
609508c6b9SPhillip Lougher}
619508c6b9SPhillip Lougher
6293e72b3cSPhilippe Liardint squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
6393e72b3cSPhilippe Liard			int offset, int length,
6493e72b3cSPhilippe Liard			struct squashfs_page_actor *output)
659508c6b9SPhillip Lougher{
669508c6b9SPhillip Lougher	int res;
679508c6b9SPhillip Lougher	struct squashfs_stream *stream = msblk->stream;
689508c6b9SPhillip Lougher
699508c6b9SPhillip Lougher	mutex_lock(&stream->mutex);
7093e72b3cSPhilippe Liard	res = msblk->decompressor->decompress(msblk, stream->stream, bio,
71846b730eSPhillip Lougher		offset, length, output);
729508c6b9SPhillip Lougher	mutex_unlock(&stream->mutex);
739508c6b9SPhillip Lougher
749508c6b9SPhillip Lougher	if (res < 0)
759508c6b9SPhillip Lougher		ERROR("%s decompression failed, data probably corrupt\n",
769508c6b9SPhillip Lougher			msblk->decompressor->name);
779508c6b9SPhillip Lougher
789508c6b9SPhillip Lougher	return res;
799508c6b9SPhillip Lougher}
809508c6b9SPhillip Lougher
819508c6b9SPhillip Lougherint squashfs_max_decompressors(void)
829508c6b9SPhillip Lougher{
839508c6b9SPhillip Lougher	return 1;
849508c6b9SPhillip Lougher}
85