Merge branch 'for-4.3/blkcg' of git://git.kernel.dk/linux-block
[firefly-linux-kernel-4.4.55.git] / drivers / staging / lustre / lustre / fid / lproc_fid.c
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  */
62 static int
63 ldebugfs_fid_write_common(const char __user *buffer, size_t count,
64                           struct lu_seq_range *range)
65 {
66         struct lu_seq_range tmp;
67         int rc;
68         char kernbuf[MAX_FID_RANGE_STRLEN];
69
70         LASSERT(range != NULL);
71
72         if (count >= sizeof(kernbuf))
73                 return -EINVAL;
74
75         if (copy_from_user(kernbuf, buffer, count))
76                 return -EFAULT;
77
78         kernbuf[count] = 0;
79
80         if (count == 5 && strcmp(kernbuf, "clear") == 0) {
81                 memset(range, 0, sizeof(*range));
82                 return count;
83         }
84
85         /* of the form "[0x0000000240000400 - 0x000000028000400]" */
86         rc = sscanf(kernbuf, "[%llx - %llx]\n",
87                     (unsigned long long *)&tmp.lsr_start,
88                     (unsigned long long *)&tmp.lsr_end);
89         if (!range_is_sane(&tmp) || range_is_zero(&tmp) ||
90             tmp.lsr_start < range->lsr_start || tmp.lsr_end > range->lsr_end)
91                 return -EINVAL;
92         *range = tmp;
93         return count;
94 }
95
96 /* Client side debugfs stuff */
97 static ssize_t
98 ldebugfs_fid_space_seq_write(struct file *file,
99                              const char __user *buffer,
100                              size_t count, loff_t *off)
101 {
102         struct lu_client_seq *seq;
103         int rc;
104
105         seq = ((struct seq_file *)file->private_data)->private;
106         LASSERT(seq != NULL);
107
108         mutex_lock(&seq->lcs_mutex);
109         rc = ldebugfs_fid_write_common(buffer, count, &seq->lcs_space);
110
111         if (rc == 0) {
112                 CDEBUG(D_INFO, "%s: Space: "DRANGE"\n",
113                        seq->lcs_name, PRANGE(&seq->lcs_space));
114         }
115
116         mutex_unlock(&seq->lcs_mutex);
117
118         return count;
119 }
120
121 static int
122 ldebugfs_fid_space_seq_show(struct seq_file *m, void *unused)
123 {
124         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
125
126         LASSERT(seq != NULL);
127
128         mutex_lock(&seq->lcs_mutex);
129         seq_printf(m, "[%#llx - %#llx]:%x:%s\n", PRANGE(&seq->lcs_space));
130         mutex_unlock(&seq->lcs_mutex);
131
132         return 0;
133 }
134
135 static ssize_t
136 ldebugfs_fid_width_seq_write(struct file *file,
137                              const char __user *buffer,
138                              size_t count, loff_t *off)
139 {
140         struct lu_client_seq *seq;
141         __u64  max;
142         int rc, val;
143
144         seq = ((struct seq_file *)file->private_data)->private;
145         LASSERT(seq != NULL);
146
147         rc = lprocfs_write_helper(buffer, count, &val);
148         if (rc)
149                 return rc;
150
151         mutex_lock(&seq->lcs_mutex);
152         if (seq->lcs_type == LUSTRE_SEQ_DATA)
153                 max = LUSTRE_DATA_SEQ_MAX_WIDTH;
154         else
155                 max = LUSTRE_METADATA_SEQ_MAX_WIDTH;
156
157         if (val <= max && val > 0) {
158                 seq->lcs_width = val;
159
160                 CDEBUG(D_INFO, "%s: Sequence size: %llu\n", seq->lcs_name,
161                        seq->lcs_width);
162         }
163
164         mutex_unlock(&seq->lcs_mutex);
165
166         return count;
167 }
168
169 static int
170 ldebugfs_fid_width_seq_show(struct seq_file *m, void *unused)
171 {
172         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
173
174         LASSERT(seq != NULL);
175
176         mutex_lock(&seq->lcs_mutex);
177         seq_printf(m, "%llu\n", seq->lcs_width);
178         mutex_unlock(&seq->lcs_mutex);
179
180         return 0;
181 }
182
183 static int
184 ldebugfs_fid_fid_seq_show(struct seq_file *m, void *unused)
185 {
186         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
187
188         LASSERT(seq != NULL);
189
190         mutex_lock(&seq->lcs_mutex);
191         seq_printf(m, DFID "\n", PFID(&seq->lcs_fid));
192         mutex_unlock(&seq->lcs_mutex);
193
194         return 0;
195 }
196
197 static int
198 ldebugfs_fid_server_seq_show(struct seq_file *m, void *unused)
199 {
200         struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
201         struct client_obd *cli;
202
203         LASSERT(seq != NULL);
204
205         if (seq->lcs_exp != NULL) {
206                 cli = &seq->lcs_exp->exp_obd->u.cli;
207                 seq_printf(m, "%s\n", cli->cl_target_uuid.uuid);
208         } else {
209                 seq_printf(m, "%s\n", seq->lcs_srv->lss_name);
210         }
211
212         return 0;
213 }
214
215 LPROC_SEQ_FOPS(ldebugfs_fid_space);
216 LPROC_SEQ_FOPS(ldebugfs_fid_width);
217 LPROC_SEQ_FOPS_RO(ldebugfs_fid_server);
218 LPROC_SEQ_FOPS_RO(ldebugfs_fid_fid);
219
220 struct lprocfs_vars seq_client_debugfs_list[] = {
221         { "space", &ldebugfs_fid_space_fops },
222         { "width", &ldebugfs_fid_width_fops },
223         { "server", &ldebugfs_fid_server_fops },
224         { "fid", &ldebugfs_fid_fid_fops },
225         { NULL }
226 };