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// 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(sizeof(*stream), GFP_KERNEL);
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,
};
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