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_HISTOGRAM
  35         if (!proc_create_seq("fs/fscache/histogram", S_IFREG | 0444, NULL,
  36                          &fscache_histogram_ops))
  37                 goto error_histogram;
  38 #endif
  39
  40 #ifdef CONFIG_FSCACHE_OBJECT_LIST
  41         if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
  42                          &fscache_objlist_proc_ops))
  43                 goto error_objects;
  44 #endif
  45
  46         _leave(" = 0");
  47         return 0;
  48
  49 #ifdef CONFIG_FSCACHE_OBJECT_LIST
  50 error_objects:
  51 #endif
  52 #ifdef CONFIG_FSCACHE_HISTOGRAM
  53         remove_proc_entry("fs/fscache/histogram", NULL);
  54 error_histogram:
  55 #endif
  56 #ifdef CONFIG_FSCACHE_STATS
  57         remove_proc_entry("fs/fscache/stats", NULL);
  58 error_stats:
  59 #endif
  60         remove_proc_entry("fs/fscache/cookies", NULL);
  61 error_cookies:
  62         remove_proc_entry("fs/fscache", NULL);
  63 error_dir:
  64         _leave(" = -ENOMEM");
  65         return -ENOMEM;
  66 }
  67
  68 /*
  69  * clean up the /proc/fs/fscache/ directory
  70  */
  71 void fscache_proc_cleanup(void)
  72 {
  73 #ifdef CONFIG_FSCACHE_OBJECT_LIST
  74         remove_proc_entry("fs/fscache/objects", NULL);
  75 #endif
  76 #ifdef CONFIG_FSCACHE_HISTOGRAM
  77         remove_proc_entry("fs/fscache/histogram", NULL);
  78 #endif
  79 #ifdef CONFIG_FSCACHE_STATS
  80         remove_proc_entry("fs/fscache/stats", NULL);
  81 #endif
  82         remove_proc_entry("fs/fscache/cookies", NULL);
  83         remove_proc_entry("fs/fscache", NULL);
  84 }