// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2013 * Phillip Lougher <phillip@squashfs.org.uk> */ #include <linux/types.h>#include <linux/mutex.h>#include <linux/slab.h>#include <linux/bio.h> #include "squashfs_fs.h"#include "squashfs_fs_sb.h"#include "decompressor.h"#include "squashfs.h" /* * This file implements single-threaded decompression in the * decompressor framework */ struct squashfs_stream {	void		*stream;	struct mutex	mutex;}; static void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,						void *comp_opts){	struct squashfs_stream *stream;	int err = -ENOMEM; 	stream = kmalloc_obj(*stream);	if (stream == NULL)		goto out; 	stream->stream = msblk->decompressor->init(msblk, comp_opts);	if (IS_ERR(stream->stream)) {		err = PTR_ERR(stream->stream);		goto out;	} 	kfree(comp_opts);	mutex_init(&stream->mutex);	return stream; out:	kfree(stream);	return ERR_PTR(err);} static void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk){	struct squashfs_stream *stream = msblk->stream; 	if (stream) {		msblk->decompressor->free(stream->stream);		kfree(stream);	}} static int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,			int offset, int length,			struct squashfs_page_actor *output){	int res;	struct squashfs_stream *stream = msblk->stream; 	mutex_lock(&stream->mutex);	res = msblk->decompressor->decompress(msblk, stream->stream, bio,		offset, length, output);	mutex_unlock(&stream->mutex); 	if (res < 0)		ERROR("%s decompression failed, data probably corrupt\n",			msblk->decompressor->name); 	return res;} static int squashfs_max_decompressors(void){	return 1;} const struct squashfs_decompressor_thread_ops squashfs_decompressor_single = {	.create = squashfs_decompressor_create,	.destroy = squashfs_decompressor_destroy,	.decompress = squashfs_decompress,	.max_decompressors = squashfs_max_decompressors,};