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  */
  17 int __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
  44 error_objects:
  45 #endif
  46 #ifdef CONFIG_FSCACHE_STATS
  47         remove_proc_entry("fs/fscache/stats", NULL);
  48 error_stats:
  49 #endif
  50         remove_proc_entry("fs/fscache/cookies", NULL);
  51 error_cookies:
  52         remove_proc_entry("fs/fscache", NULL);
  53 error_dir:
  54         _leave(" = -ENOMEM");
  55         return -ENOMEM;
  56 }
  57
  58 /*
  59  * clean up the /proc/fs/fscache/ directory
  60  */
  61 void 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 }