fs/netfs/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  * Add files to /proc/fs/netfs/.
  16  */
  17 int __init fscache_proc_init(void)
  18 {
  19         if (!proc_symlink("fs/fscache", NULL, "netfs"))
  20                 goto error_sym;
  21
  22         if (!proc_create_seq("fs/netfs/caches", S_IFREG | 0444, NULL,
  23                              &fscache_caches_seq_ops))
  24                 goto error;
  25
  26         if (!proc_create_seq("fs/netfs/volumes", S_IFREG | 0444, NULL,
  27                              &fscache_volumes_seq_ops))
  28                 goto error;
  29
  30         if (!proc_create_seq("fs/netfs/cookies", S_IFREG | 0444, NULL,
  31                              &fscache_cookies_seq_ops))
  32                 goto error;
  33         return 0;
  34
  35 error:
  36         remove_proc_entry("fs/fscache", NULL);
  37 error_sym:
  38         return -ENOMEM;
  39 }
  40
  41 /*
  42  * Clean up the /proc/fs/fscache symlink.
  43  */
  44 void fscache_proc_cleanup(void)
  45 {
  46         remove_proc_subtree("fs/fscache", NULL);
  47 }