text: // SPDX-License-Identifier: GPL-2.0-or-later
  /* FS-Cache statistics viewing interface
   *
   * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   */
  
  #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;
  
  	if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
  			     &fscache_cookies_seq_ops))
  		goto error_cookies;
  
  #ifdef CONFIG_FSCACHE_STATS
  	if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
  			fscache_stats_show))
  		goto error_stats;
  #endif
  
  #ifdef CONFIG_FSCACHE_OBJECT_LIST
  	if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
  			 &fscache_objlist_proc_ops))
  		goto error_objects;
  #endif
  
  	_leave(" = 0");
  	return 0;
  
  #ifdef CONFIG_FSCACHE_OBJECT_LIST
  error_objects:
  #endif
  #ifdef CONFIG_FSCACHE_STATS
  	remove_proc_entry("fs/fscache/stats", NULL);
  error_stats:
  #endif
  	remove_proc_entry("fs/fscache/cookies", NULL);
  error_cookies:
  	remove_proc_entry("fs/fscache", NULL);
  error_dir:
  	_leave(" = -ENOMEM");
  	return -ENOMEM;
  }
  
  /*
   * clean up the /proc/fs/fscache/ directory
   */
  void fscache_proc_cleanup(void)
  {
  #ifdef CONFIG_FSCACHE_OBJECT_LIST
  	remove_proc_entry("fs/fscache/objects", NULL);
  #endif
  #ifdef CONFIG_FSCACHE_STATS
  	remove_proc_entry("fs/fscache/stats", NULL);
  #endif
  	remove_proc_entry("fs/fscache/cookies", NULL);
  	remove_proc_entry("fs/fscache", NULL);
  }
  