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 } 48