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) 2011, 2012, 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/fid/lproc_fid.c
37 *
38 * Lustre Sequence Manager
39 *
40 * Author: Yury Umanets <umka@clusterfs.com>
41 */
42
43#define DEBUG_SUBSYSTEM S_FID
44
45#include "../../include/linux/libcfs/libcfs.h"
46#include <linux/module.h>
47
48#include "../include/obd.h"
49#include "../include/obd_class.h"
50#include "../include/dt_object.h"
51#include "../include/obd_support.h"
52#include "../include/lustre_req_layout.h"
53#include "../include/lustre_fid.h"
54#include "fid_internal.h"
55
56/* Format: [0x64BIT_INT - 0x64BIT_INT] + 32 bytes just in case */
57#define MAX_FID_RANGE_STRLEN (32 + 2 * 2 * sizeof(__u64))
58/*
59 * Note: this function is only used for testing, it is no safe for production
60 * use.
61 */
62static int lprocfs_fid_write_common(const char __user *buffer, size_t count,
63				    struct lu_seq_range *range)
64{
65	struct lu_seq_range tmp;
66	int rc;
67	char kernbuf[MAX_FID_RANGE_STRLEN];
68
69	LASSERT(range != NULL);
70
71	if (count >= sizeof(kernbuf))
72		return -EINVAL;
73
74	if (copy_from_user(kernbuf, buffer, count))
75		return -EFAULT;
76
77	kernbuf[count] = 0;
78
79	if (count == 5 && strcmp(kernbuf, "clear") == 0) {
80		memset(range, 0, sizeof(*range));
81		return count;
82	}
83
84	/* of the form "[0x0000000240000400 - 0x000000028000400]" */
85	rc = sscanf(kernbuf, "[%llx - %llx]\n",
86		    (unsigned long long *)&tmp.lsr_start,
87		    (unsigned long long *)&tmp.lsr_end);
88	if (!range_is_sane(&tmp) || range_is_zero(&tmp) ||
89	    tmp.lsr_start < range->lsr_start || tmp.lsr_end > range->lsr_end)
90		return -EINVAL;
91	*range = tmp;
92	return count;
93}
94
95/* Client side procfs stuff */
96static ssize_t lprocfs_fid_space_seq_write(struct file *file,
97					   const char __user *buffer,
98					   size_t count, loff_t *off)
99{
100	struct lu_client_seq *seq;
101	int rc;
102
103	seq = ((struct seq_file *)file->private_data)->private;
104	LASSERT(seq != NULL);
105
106	mutex_lock(&seq->lcs_mutex);
107	rc = lprocfs_fid_write_common(buffer, count, &seq->lcs_space);
108
109	if (rc == 0) {
110		CDEBUG(D_INFO, "%s: Space: "DRANGE"\n",
111		       seq->lcs_name, PRANGE(&seq->lcs_space));
112	}
113
114	mutex_unlock(&seq->lcs_mutex);
115
116	return count;
117}
118
119static int
120lprocfs_fid_space_seq_show(struct seq_file *m, void *unused)
121{
122	struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
123	int rc;
124
125	LASSERT(seq != NULL);
126
127	mutex_lock(&seq->lcs_mutex);
128	rc = seq_printf(m, "[%#llx - %#llx]:%x:%s\n", PRANGE(&seq->lcs_space));
129	mutex_unlock(&seq->lcs_mutex);
130
131	return rc;
132}
133
134static ssize_t lprocfs_fid_width_seq_write(struct file *file,
135					   const char __user *buffer,
136					   size_t count, loff_t *off)
137{
138	struct lu_client_seq *seq;
139	__u64  max;
140	int rc, val;
141
142	seq = ((struct seq_file *)file->private_data)->private;
143	LASSERT(seq != NULL);
144
145	rc = lprocfs_write_helper(buffer, count, &val);
146	if (rc)
147		return rc;
148
149	mutex_lock(&seq->lcs_mutex);
150	if (seq->lcs_type == LUSTRE_SEQ_DATA)
151		max = LUSTRE_DATA_SEQ_MAX_WIDTH;
152	else
153		max = LUSTRE_METADATA_SEQ_MAX_WIDTH;
154
155	if (val <= max && val > 0) {
156		seq->lcs_width = val;
157
158		if (rc == 0) {
159			CDEBUG(D_INFO, "%s: Sequence size: %llu\n",
160			       seq->lcs_name, seq->lcs_width);
161		}
162	}
163
164	mutex_unlock(&seq->lcs_mutex);
165
166	return count;
167}
168
169static int
170lprocfs_fid_width_seq_show(struct seq_file *m, void *unused)
171{
172	struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
173	int rc;
174
175	LASSERT(seq != NULL);
176
177	mutex_lock(&seq->lcs_mutex);
178	rc = seq_printf(m, "%llu\n", seq->lcs_width);
179	mutex_unlock(&seq->lcs_mutex);
180
181	return rc;
182}
183
184static int
185lprocfs_fid_fid_seq_show(struct seq_file *m, void *unused)
186{
187	struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
188	int rc;
189
190	LASSERT(seq != NULL);
191
192	mutex_lock(&seq->lcs_mutex);
193	rc = seq_printf(m, DFID"\n", PFID(&seq->lcs_fid));
194	mutex_unlock(&seq->lcs_mutex);
195
196	return rc;
197}
198
199static int
200lprocfs_fid_server_seq_show(struct seq_file *m, void *unused)
201{
202	struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
203	struct client_obd *cli;
204	int rc;
205
206	LASSERT(seq != NULL);
207
208	if (seq->lcs_exp != NULL) {
209		cli = &seq->lcs_exp->exp_obd->u.cli;
210		rc = seq_printf(m, "%s\n", cli->cl_target_uuid.uuid);
211	} else {
212		rc = seq_printf(m, "%s\n", seq->lcs_srv->lss_name);
213	}
214	return rc;
215}
216
217LPROC_SEQ_FOPS(lprocfs_fid_space);
218LPROC_SEQ_FOPS(lprocfs_fid_width);
219LPROC_SEQ_FOPS_RO(lprocfs_fid_server);
220LPROC_SEQ_FOPS_RO(lprocfs_fid_fid);
221
222struct lprocfs_vars seq_client_proc_list[] = {
223	{ "space", &lprocfs_fid_space_fops },
224	{ "width", &lprocfs_fid_width_fops },
225	{ "server", &lprocfs_fid_server_fops },
226	{ "fid", &lprocfs_fid_fid_fops },
227	{ NULL }
228};
229