cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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decompressor_single.c (1691B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2013
      4 * Phillip Lougher <phillip@squashfs.org.uk>
      5 */
      6
      7#include <linux/types.h>
      8#include <linux/mutex.h>
      9#include <linux/slab.h>
     10#include <linux/bio.h>
     11
     12#include "squashfs_fs.h"
     13#include "squashfs_fs_sb.h"
     14#include "decompressor.h"
     15#include "squashfs.h"
     16
     17/*
     18 * This file implements single-threaded decompression in the
     19 * decompressor framework
     20 */
     21
     22struct squashfs_stream {
     23	void		*stream;
     24	struct mutex	mutex;
     25};
     26
     27void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
     28						void *comp_opts)
     29{
     30	struct squashfs_stream *stream;
     31	int err = -ENOMEM;
     32
     33	stream = kmalloc(sizeof(*stream), GFP_KERNEL);
     34	if (stream == NULL)
     35		goto out;
     36
     37	stream->stream = msblk->decompressor->init(msblk, comp_opts);
     38	if (IS_ERR(stream->stream)) {
     39		err = PTR_ERR(stream->stream);
     40		goto out;
     41	}
     42
     43	kfree(comp_opts);
     44	mutex_init(&stream->mutex);
     45	return stream;
     46
     47out:
     48	kfree(stream);
     49	return ERR_PTR(err);
     50}
     51
     52void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
     53{
     54	struct squashfs_stream *stream = msblk->stream;
     55
     56	if (stream) {
     57		msblk->decompressor->free(stream->stream);
     58		kfree(stream);
     59	}
     60}
     61
     62int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
     63			int offset, int length,
     64			struct squashfs_page_actor *output)
     65{
     66	int res;
     67	struct squashfs_stream *stream = msblk->stream;
     68
     69	mutex_lock(&stream->mutex);
     70	res = msblk->decompressor->decompress(msblk, stream->stream, bio,
     71		offset, length, output);
     72	mutex_unlock(&stream->mutex);
     73
     74	if (res < 0)
     75		ERROR("%s decompression failed, data probably corrupt\n",
     76			msblk->decompressor->name);
     77
     78	return res;
     79}
     80
     81int squashfs_max_decompressors(void)
     82{
     83	return 1;
     84}