| 1 | /* |
| 2 | * GPL HEADER START |
| 3 | * |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License version 2 for more details (a copy is included |
| 14 | * in the LICENSE file that accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * version 2 along with this program; If not, see |
| 18 | * http://www.gnu.org/licenses/gpl-2.0.html |
| 19 | * |
| 20 | * GPL HEADER END |
| 21 | */ |
| 22 | /* |
| 23 | * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. |
| 24 | * Use is subject to license terms. |
| 25 | * |
| 26 | * Copyright (c) 2012, 2015, Intel Corporation. |
| 27 | */ |
| 28 | /* |
| 29 | * This file is part of Lustre, http://www.lustre.org/ |
| 30 | * Lustre is a trademark of Sun Microsystems, Inc. |
| 31 | * |
| 32 | * lustre/fld/lproc_fld.c |
| 33 | * |
| 34 | * FLD (FIDs Location Database) |
| 35 | * |
| 36 | * Author: Yury Umanets <umka@clusterfs.com> |
| 37 | * Di Wang <di.wang@whamcloud.com> |
| 38 | */ |
| 39 | |
| 40 | #define DEBUG_SUBSYSTEM S_FLD |
| 41 | |
| 42 | #include "../../include/linux/libcfs/libcfs.h" |
| 43 | #include <linux/module.h> |
| 44 | |
| 45 | #include "../include/obd.h" |
| 46 | #include "../include/obd_class.h" |
| 47 | #include "../include/obd_support.h" |
| 48 | #include "../include/lustre_req_layout.h" |
| 49 | #include "../include/lustre_fld.h" |
| 50 | #include "../include/lustre_fid.h" |
| 51 | #include "fld_internal.h" |
| 52 | |
| 53 | static int |
| 54 | fld_debugfs_targets_seq_show(struct seq_file *m, void *unused) |
| 55 | { |
| 56 | struct lu_client_fld *fld = (struct lu_client_fld *)m->private; |
| 57 | struct lu_fld_target *target; |
| 58 | |
| 59 | spin_lock(&fld->lcf_lock); |
| 60 | list_for_each_entry(target, &fld->lcf_targets, ft_chain) |
| 61 | seq_printf(m, "%s\n", fld_target_name(target)); |
| 62 | spin_unlock(&fld->lcf_lock); |
| 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static int |
| 68 | fld_debugfs_hash_seq_show(struct seq_file *m, void *unused) |
| 69 | { |
| 70 | struct lu_client_fld *fld = (struct lu_client_fld *)m->private; |
| 71 | |
| 72 | spin_lock(&fld->lcf_lock); |
| 73 | seq_printf(m, "%s\n", fld->lcf_hash->fh_name); |
| 74 | spin_unlock(&fld->lcf_lock); |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static ssize_t |
| 80 | fld_debugfs_hash_seq_write(struct file *file, |
| 81 | const char __user *buffer, |
| 82 | size_t count, loff_t *off) |
| 83 | { |
| 84 | struct lu_client_fld *fld; |
| 85 | struct lu_fld_hash *hash = NULL; |
| 86 | char fh_name[8]; |
| 87 | int i; |
| 88 | |
| 89 | if (count > sizeof(fh_name)) |
| 90 | return -ENAMETOOLONG; |
| 91 | |
| 92 | if (copy_from_user(fh_name, buffer, count) != 0) |
| 93 | return -EFAULT; |
| 94 | |
| 95 | fld = ((struct seq_file *)file->private_data)->private; |
| 96 | |
| 97 | for (i = 0; fld_hash[i].fh_name; i++) { |
| 98 | if (count != strlen(fld_hash[i].fh_name)) |
| 99 | continue; |
| 100 | |
| 101 | if (!strncmp(fld_hash[i].fh_name, fh_name, count)) { |
| 102 | hash = &fld_hash[i]; |
| 103 | break; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | if (hash) { |
| 108 | spin_lock(&fld->lcf_lock); |
| 109 | fld->lcf_hash = hash; |
| 110 | spin_unlock(&fld->lcf_lock); |
| 111 | |
| 112 | CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n", |
| 113 | fld->lcf_name, hash->fh_name); |
| 114 | } |
| 115 | |
| 116 | return count; |
| 117 | } |
| 118 | |
| 119 | static ssize_t |
| 120 | fld_debugfs_cache_flush_write(struct file *file, const char __user *buffer, |
| 121 | size_t count, loff_t *pos) |
| 122 | { |
| 123 | struct lu_client_fld *fld = file->private_data; |
| 124 | |
| 125 | fld_cache_flush(fld->lcf_cache); |
| 126 | |
| 127 | CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name); |
| 128 | |
| 129 | return count; |
| 130 | } |
| 131 | |
| 132 | static int |
| 133 | fld_debugfs_cache_flush_release(struct inode *inode, struct file *file) |
| 134 | { |
| 135 | file->private_data = NULL; |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static struct file_operations fld_debugfs_cache_flush_fops = { |
| 140 | .owner = THIS_MODULE, |
| 141 | .open = simple_open, |
| 142 | .write = fld_debugfs_cache_flush_write, |
| 143 | .release = fld_debugfs_cache_flush_release, |
| 144 | }; |
| 145 | |
| 146 | LPROC_SEQ_FOPS_RO(fld_debugfs_targets); |
| 147 | LPROC_SEQ_FOPS(fld_debugfs_hash); |
| 148 | |
| 149 | struct lprocfs_vars fld_client_debugfs_list[] = { |
| 150 | { "targets", &fld_debugfs_targets_fops }, |
| 151 | { "hash", &fld_debugfs_hash_fops }, |
| 152 | { "cache_flush", &fld_debugfs_cache_flush_fops }, |
| 153 | { NULL } |
| 154 | }; |