fs/fscache/proc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* FS-Cache statistics viewing interface
   3  *
   4  * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #define FSCACHE_DEBUG_LEVEL CACHE
   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         if (!proc_mkdir("fs/fscache", NULL))
  20                 goto error_dir;
  21
  22         if (!proc_create_seq("fs/fscache/caches", S_IFREG | 0444, NULL,
  23                              &fscache_caches_seq_ops))
  24                 goto error;
  25
  26         if (!proc_create_seq("fs/fscache/volumes", S_IFREG | 0444, NULL,
  27                              &fscache_volumes_seq_ops))
  28                 goto error;
  29
  30         if (!proc_create_seq("fs/fscache/cookies", S_IFREG | 0444, NULL,
  31                              &fscache_cookies_seq_ops))
  32                 goto error;
  33
  34 #ifdef CONFIG_FSCACHE_STATS
  35         if (!proc_create_single("fs/fscache/stats", S_IFREG | 0444, NULL,
  36                                 fscache_stats_show))
  37                 goto error;
  38 #endif
  39
  40         return 0;
  41
  42 error:
  43         remove_proc_entry("fs/fscache", NULL);
  44 error_dir:
  45         return -ENOMEM;
  46 }
  47
  48 /*
  49  * clean up the /proc/fs/fscache/ directory
  50  */
  51 void fscache_proc_cleanup(void)
  52 {
  53         remove_proc_subtree("fs/fscache", NULL);
  54 }