fs/fscache/proc.c

   1 /* FS-Cache statistics viewing interface
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define FSCACHE_DEBUG_LEVEL OPERATION
  13 #include <linux/module.h>
  14 #include <linux/proc_fs.h>
  15 #include <linux/seq_file.h>
  16 #include "internal.h"
  17
  18 /*
  19  * initialise the /proc/fs/fscache/ directory
  20  */
  21 int __init fscache_proc_init(void)
  22 {
  23         _enter("");
  24
  25         if (!proc_mkdir("fs/fscache", NULL))
  26                 goto error_dir;
  27
  28 #ifdef CONFIG_FSCACHE_STATS
  29         if (!proc_create("fs/fscache/stats", S_IFREG | 0444, NULL,
  30                          &fscache_stats_fops))
  31                 goto error_stats;
  32 #endif
  33
  34 #ifdef CONFIG_FSCACHE_HISTOGRAM
  35         if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL,
  36                          &fscache_histogram_fops))
  37                 goto error_histogram;
  38 #endif
  39
  40         _leave(" = 0");
  41         return 0;
  42
  43 #ifdef CONFIG_FSCACHE_HISTOGRAM
  44 error_histogram:
  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", NULL);
  51 error_dir:
  52         _leave(" = -ENOMEM");
  53         return -ENOMEM;
  54 }
  55
  56 /*
  57  * clean up the /proc/fs/fscache/ directory
  58  */
  59 void fscache_proc_cleanup(void)
  60 {
  61 #ifdef CONFIG_FSCACHE_HISTOGRAM
  62         remove_proc_entry("fs/fscache/histogram", NULL);
  63 #endif
  64 #ifdef CONFIG_FSCACHE_STATS
  65         remove_proc_entry("fs/fscache/stats", NULL);
  66 #endif
  67         remove_proc_entry("fs/fscache", NULL);
  68 }