LXR linux/fs/fscache/proc.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* FS-Cache statistics viewing interface
   3 *
   4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5 * Written by David Howells (dhowells@redhat.com)
   6 */
   7
   8#define FSCACHE_DEBUG_LEVEL OPERATION
   9#include <linux/module.h>
  10#include <linux/proc_fs.h>
  11#include <linux/seq_file.h>
  12#include "internal.h"
  13
  14/*
  15 * initialise the /proc/fs/fscache/ directory
  16 */
  17int __init fscache_proc_init(void)
  18{
  19        _enter("");
  20
  21        if (!proc_mkdir("fs/fscache", NULL))
  22                goto error_dir;
  23
  24        if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
  25                             &fscache_cookies_seq_ops))
  26                goto error_cookies;
  27
  28#ifdef CONFIG_FSCACHE_STATS
  29        if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
  30                        fscache_stats_show))
  31                goto error_stats;
  32#endif
  33
  34#ifdef CONFIG_FSCACHE_OBJECT_LIST
  35        if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
  36                         &fscache_objlist_proc_ops))
  37                goto error_objects;
  38#endif
  39
  40        _leave(" = 0");
  41        return 0;
  42
  43#ifdef CONFIG_FSCACHE_OBJECT_LIST
  44error_objects:
  45#endif
  46#ifdef CONFIG_FSCACHE_STATS
  47        remove_proc_entry("fs/fscache/stats", NULL);
  48error_stats:
  49#endif
  50        remove_proc_entry("fs/fscache/cookies", NULL);
  51error_cookies:
  52        remove_proc_entry("fs/fscache", NULL);
  53error_dir:
  54        _leave(" = -ENOMEM");
  55        return -ENOMEM;
  56}
  57
  58/*
  59 * clean up the /proc/fs/fscache/ directory
  60 */
  61void fscache_proc_cleanup(void)
  62{
  63#ifdef CONFIG_FSCACHE_OBJECT_LIST
  64        remove_proc_entry("fs/fscache/objects", NULL);
  65#endif
  66#ifdef CONFIG_FSCACHE_STATS
  67        remove_proc_entry("fs/fscache/stats", NULL);
  68#endif
  69        remove_proc_entry("fs/fscache/cookies", NULL);
  70        remove_proc_entry("fs/fscache", NULL);
  71}
  72