mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 12:14:01 +08:00
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
|
|
/*
|
|
* Copyright (c) 2013
|
|
* Phillip Lougher <phillip@squashfs.org.uk>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/buffer_head.h>
|
|
|
|
#include "squashfs_fs.h"
|
|
#include "squashfs_fs_sb.h"
|
|
#include "decompressor.h"
|
|
#include "squashfs.h"
|
|
|
|
/*
|
|
* This file implements multi-threaded decompression using percpu
|
|
* variables, one thread per cpu core.
|
|
*/
|
|
|
|
struct squashfs_stream {
|
|
void *stream;
|
|
};
|
|
|
|
void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
|
|
void *comp_opts)
|
|
{
|
|
struct squashfs_stream *stream;
|
|
struct squashfs_stream __percpu *percpu;
|
|
int err, cpu;
|
|
|
|
percpu = alloc_percpu(struct squashfs_stream);
|
|
if (percpu == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
stream = per_cpu_ptr(percpu, cpu);
|
|
stream->stream = msblk->decompressor->init(msblk, comp_opts);
|
|
if (IS_ERR(stream->stream)) {
|
|
err = PTR_ERR(stream->stream);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
kfree(comp_opts);
|
|
return (__force void *) percpu;
|
|
|
|
out:
|
|
for_each_possible_cpu(cpu) {
|
|
stream = per_cpu_ptr(percpu, cpu);
|
|
if (!IS_ERR_OR_NULL(stream->stream))
|
|
msblk->decompressor->free(stream->stream);
|
|
}
|
|
free_percpu(percpu);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
|
|
{
|
|
struct squashfs_stream __percpu *percpu =
|
|
(struct squashfs_stream __percpu *) msblk->stream;
|
|
struct squashfs_stream *stream;
|
|
int cpu;
|
|
|
|
if (msblk->stream) {
|
|
for_each_possible_cpu(cpu) {
|
|
stream = per_cpu_ptr(percpu, cpu);
|
|
msblk->decompressor->free(stream->stream);
|
|
}
|
|
free_percpu(percpu);
|
|
}
|
|
}
|
|
|
|
int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh,
|
|
int b, int offset, int length, struct squashfs_page_actor *output)
|
|
{
|
|
struct squashfs_stream __percpu *percpu =
|
|
(struct squashfs_stream __percpu *) msblk->stream;
|
|
struct squashfs_stream *stream = get_cpu_ptr(percpu);
|
|
int res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
|
|
offset, length, output);
|
|
put_cpu_ptr(stream);
|
|
|
|
if (res < 0)
|
|
ERROR("%s decompression failed, data probably corrupt\n",
|
|
msblk->decompressor->name);
|
|
|
|
return res;
|
|
}
|
|
|
|
int squashfs_max_decompressors(void)
|
|
{
|
|
return num_possible_cpus();
|
|
}
|