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.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, 2013, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lustre/fld/lproc_fld.c
37 *
38 * FLD (FIDs Location Database)
39 *
40 * Author: Yury Umanets <umka@clusterfs.com>
41 * Di Wang <di.wang@whamcloud.com>
42 */
43
44 #define DEBUG_SUBSYSTEM S_FLD
45
46 #include "../../include/linux/libcfs/libcfs.h"
47 #include <linux/module.h>
48
49 #include "../include/obd.h"
50 #include "../include/obd_class.h"
51 #include "../include/obd_support.h"
52 #include "../include/lustre_req_layout.h"
53 #include "../include/lustre_fld.h"
54 #include "../include/lustre_fid.h"
55 #include "fld_internal.h"
56
57 static int
fld_debugfs_targets_seq_show(struct seq_file * m,void * unused)58 fld_debugfs_targets_seq_show(struct seq_file *m, void *unused)
59 {
60 struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
61 struct lu_fld_target *target;
62
63 LASSERT(fld != NULL);
64
65 spin_lock(&fld->lcf_lock);
66 list_for_each_entry(target,
67 &fld->lcf_targets, ft_chain)
68 seq_printf(m, "%s\n", fld_target_name(target));
69 spin_unlock(&fld->lcf_lock);
70
71 return 0;
72 }
73
74 static int
fld_debugfs_hash_seq_show(struct seq_file * m,void * unused)75 fld_debugfs_hash_seq_show(struct seq_file *m, void *unused)
76 {
77 struct lu_client_fld *fld = (struct lu_client_fld *)m->private;
78
79 LASSERT(fld != NULL);
80
81 spin_lock(&fld->lcf_lock);
82 seq_printf(m, "%s\n", fld->lcf_hash->fh_name);
83 spin_unlock(&fld->lcf_lock);
84
85 return 0;
86 }
87
88 static ssize_t
fld_debugfs_hash_seq_write(struct file * file,const char __user * buffer,size_t count,loff_t * off)89 fld_debugfs_hash_seq_write(struct file *file,
90 const char __user *buffer,
91 size_t count, loff_t *off)
92 {
93 struct lu_client_fld *fld;
94 struct lu_fld_hash *hash = NULL;
95 char fh_name[8];
96 int i;
97
98 if (count > sizeof(fh_name))
99 return -ENAMETOOLONG;
100
101 if (copy_from_user(fh_name, buffer, count) != 0)
102 return -EFAULT;
103
104 fld = ((struct seq_file *)file->private_data)->private;
105 LASSERT(fld != NULL);
106
107 for (i = 0; fld_hash[i].fh_name != NULL; i++) {
108 if (count != strlen(fld_hash[i].fh_name))
109 continue;
110
111 if (!strncmp(fld_hash[i].fh_name, fh_name, count)) {
112 hash = &fld_hash[i];
113 break;
114 }
115 }
116
117 if (hash != NULL) {
118 spin_lock(&fld->lcf_lock);
119 fld->lcf_hash = hash;
120 spin_unlock(&fld->lcf_lock);
121
122 CDEBUG(D_INFO, "%s: Changed hash to \"%s\"\n",
123 fld->lcf_name, hash->fh_name);
124 }
125
126 return count;
127 }
128
129 static ssize_t
fld_debugfs_cache_flush_write(struct file * file,const char __user * buffer,size_t count,loff_t * pos)130 fld_debugfs_cache_flush_write(struct file *file, const char __user *buffer,
131 size_t count, loff_t *pos)
132 {
133 struct lu_client_fld *fld = file->private_data;
134
135 LASSERT(fld != NULL);
136
137 fld_cache_flush(fld->lcf_cache);
138
139 CDEBUG(D_INFO, "%s: Lookup cache is flushed\n", fld->lcf_name);
140
141 return count;
142 }
143
144 static int
fld_debugfs_cache_flush_release(struct inode * inode,struct file * file)145 fld_debugfs_cache_flush_release(struct inode *inode, struct file *file)
146 {
147 file->private_data = NULL;
148 return 0;
149 }
150
151 static struct file_operations fld_debugfs_cache_flush_fops = {
152 .owner = THIS_MODULE,
153 .open = simple_open,
154 .write = fld_debugfs_cache_flush_write,
155 .release = fld_debugfs_cache_flush_release,
156 };
157
158 LPROC_SEQ_FOPS_RO(fld_debugfs_targets);
159 LPROC_SEQ_FOPS(fld_debugfs_hash);
160
161 struct lprocfs_vars fld_client_debugfs_list[] = {
162 { "targets", &fld_debugfs_targets_fops },
163 { "hash", &fld_debugfs_hash_fops },
164 { "cache_flush", &fld_debugfs_cache_flush_fops },
165 { NULL }
166 };
167