Eric Lee / smarc-fsl-linux-kernel

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fs/squashfs/decompressor_multi_percpu.c 2.19 KB
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20c8ccb19   Thomas Gleixner   treewide: Replace... 
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  // SPDX-License-Identifier: GPL-2.0-only
d208383d6   Phillip Lougher   Squashfs: add mul... 
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  /*
   * Copyright (c) 2013
   * Phillip Lougher <phillip@squashfs.org.uk>
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   */
  
  #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);
  	}
  }
846b730e9   Phillip Lougher   Squashfs: General... 
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  int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh,
  	int b, int offset, int length, struct squashfs_page_actor *output)
d208383d6   Phillip Lougher   Squashfs: add mul... 
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  {
  	struct squashfs_stream __percpu *percpu =
  			(struct squashfs_stream __percpu *) msblk->stream;
  	struct squashfs_stream *stream = get_cpu_ptr(percpu);
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  	int res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
  		offset, length, output);
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  	put_cpu_ptr(stream);
  
  	if (res < 0)
  		ERROR("%s decompression failed, data probably corrupt
  ",
  			msblk->decompressor->name);
  
  	return res;
  }
  
  int squashfs_max_decompressors(void)
  {
  	return num_possible_cpus();
  }