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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, }; |