Eric Lee / smarc-fsl-linux-kernel

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fs/fscache/proc.c 1.69 KB
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2874c5fd2   Thomas Gleixner   treewide: Replace... 
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  // SPDX-License-Identifier: GPL-2.0-or-later
7394daa8c   David Howells   FS-Cache: Add use... 
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  /* FS-Cache statistics viewing interface
   *
   * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
7394daa8c   David Howells   FS-Cache: Add use... 
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   */
  
  #define FSCACHE_DEBUG_LEVEL OPERATION
  #include <linux/module.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  #include "internal.h"
  
  /*
   * initialise the /proc/fs/fscache/ directory
   */
  int __init fscache_proc_init(void)
  {
  	_enter("");
  
  	if (!proc_mkdir("fs/fscache", NULL))
  		goto error_dir;
  
  #ifdef CONFIG_FSCACHE_STATS
3f3942aca   Christoph Hellwig   proc: introduce p... 
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  	if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
  			fscache_stats_show))
7394daa8c   David Howells   FS-Cache: Add use... 
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  		goto error_stats;
  #endif
  
  #ifdef CONFIG_FSCACHE_HISTOGRAM
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  	if (!proc_create_seq("fs/fscache/histogram", S_IFREG | 0444, NULL,
  			 &fscache_histogram_ops))
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  		goto error_histogram;
  #endif
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  #ifdef CONFIG_FSCACHE_OBJECT_LIST
  	if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
  			 &fscache_objlist_fops))
  		goto error_objects;
  #endif
7394daa8c   David Howells   FS-Cache: Add use... 
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  	_leave(" = 0");
  	return 0;
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  #ifdef CONFIG_FSCACHE_OBJECT_LIST
  error_objects:
  #endif
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  #ifdef CONFIG_FSCACHE_HISTOGRAM
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  	remove_proc_entry("fs/fscache/histogram", NULL);
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  error_histogram:
  #endif
  #ifdef CONFIG_FSCACHE_STATS
  	remove_proc_entry("fs/fscache/stats", NULL);
  error_stats:
  #endif
  	remove_proc_entry("fs/fscache", NULL);
  error_dir:
  	_leave(" = -ENOMEM");
  	return -ENOMEM;
  }
  
  /*
   * clean up the /proc/fs/fscache/ directory
   */
  void fscache_proc_cleanup(void)
  {
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  #ifdef CONFIG_FSCACHE_OBJECT_LIST
  	remove_proc_entry("fs/fscache/objects", NULL);
  #endif
7394daa8c   David Howells   FS-Cache: Add use... 
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  #ifdef CONFIG_FSCACHE_HISTOGRAM
  	remove_proc_entry("fs/fscache/histogram", NULL);
  #endif
  #ifdef CONFIG_FSCACHE_STATS
  	remove_proc_entry("fs/fscache/stats", NULL);
  #endif
  	remove_proc_entry("fs/fscache", NULL);
  }