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20c8ccb197
Based on 1 normalized pattern(s): this work is licensed under the terms of the gnu gpl version 2 see the copying file in the top level directory extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 35 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.797835076@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2013
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* Phillip Lougher <phillip@squashfs.org.uk>
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/percpu.h>
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#include <linux/buffer_head.h>
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#include "squashfs_fs.h"
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#include "squashfs_fs_sb.h"
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#include "decompressor.h"
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#include "squashfs.h"
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/*
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* This file implements multi-threaded decompression using percpu
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* variables, one thread per cpu core.
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*/
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struct squashfs_stream {
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void *stream;
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};
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void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
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void *comp_opts)
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{
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struct squashfs_stream *stream;
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struct squashfs_stream __percpu *percpu;
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int err, cpu;
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percpu = alloc_percpu(struct squashfs_stream);
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if (percpu == NULL)
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return ERR_PTR(-ENOMEM);
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for_each_possible_cpu(cpu) {
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stream = per_cpu_ptr(percpu, cpu);
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stream->stream = msblk->decompressor->init(msblk, comp_opts);
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if (IS_ERR(stream->stream)) {
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err = PTR_ERR(stream->stream);
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goto out;
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}
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}
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kfree(comp_opts);
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return (__force void *) percpu;
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out:
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for_each_possible_cpu(cpu) {
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stream = per_cpu_ptr(percpu, cpu);
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if (!IS_ERR_OR_NULL(stream->stream))
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msblk->decompressor->free(stream->stream);
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}
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free_percpu(percpu);
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return ERR_PTR(err);
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}
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void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
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{
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struct squashfs_stream __percpu *percpu =
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(struct squashfs_stream __percpu *) msblk->stream;
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struct squashfs_stream *stream;
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int cpu;
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if (msblk->stream) {
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for_each_possible_cpu(cpu) {
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stream = per_cpu_ptr(percpu, cpu);
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msblk->decompressor->free(stream->stream);
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}
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free_percpu(percpu);
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}
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}
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int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh,
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int b, int offset, int length, struct squashfs_page_actor *output)
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{
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struct squashfs_stream __percpu *percpu =
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(struct squashfs_stream __percpu *) msblk->stream;
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struct squashfs_stream *stream = get_cpu_ptr(percpu);
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int res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
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offset, length, output);
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put_cpu_ptr(stream);
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if (res < 0)
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ERROR("%s decompression failed, data probably corrupt\n",
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msblk->decompressor->name);
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return res;
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}
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int squashfs_max_decompressors(void)
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{
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return num_possible_cpus();
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}
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