aboutsummaryrefslogtreecommitdiff
path: root/fs/dlm/debug_fs.c
blob: 49deca845dbaf66ffd7091653436796085ff195c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
/******************************************************************************
*******************************************************************************
**
**  Copyright (C) 2005 Red Hat, Inc.  All rights reserved.
**
**  This copyrighted material is made available to anyone wishing to use,
**  modify, copy, or redistribute it subject to the terms and conditions
**  of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/

#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>

#include "dlm_internal.h"


static struct dentry *dlm_root;

struct rsb_iter {
	int entry;
	struct dlm_ls *ls;
	struct list_head *next;
	struct dlm_rsb *rsb;
};

static char *print_lockmode(int mode)
{
	switch (mode) {
	case DLM_LOCK_IV:
		return "--";
	case DLM_LOCK_NL:
		return "NL";
	case DLM_LOCK_CR:
		return "CR";
	case DLM_LOCK_CW:
		return "CW";
	case DLM_LOCK_PR:
		return "PR";
	case DLM_LOCK_PW:
		return "PW";
	case DLM_LOCK_EX:
		return "EX";
	default:
		return "??";
	}
}

static void print_lock(struct seq_file *s, struct dlm_lkb *lkb,
		       struct dlm_rsb *res)
{
	seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));

	if (lkb->lkb_status == DLM_LKSTS_CONVERT
	    || lkb->lkb_status == DLM_LKSTS_WAITING)
		seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));

	if (lkb->lkb_nodeid) {
		if (lkb->lkb_nodeid != res->res_nodeid)
			seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
				   lkb->lkb_remid);
		else
			seq_printf(s, " Master:     %08x", lkb->lkb_remid);
	}

	if (lkb->lkb_wait_type)
		seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);

	seq_printf(s, "\n");
}

static int print_resource(struct dlm_rsb *res, struct seq_file *s)
{
	struct dlm_lkb *lkb;
	int i, lvblen = res->res_ls->ls_lvblen;

	seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
	for (i = 0; i < res->res_length; i++) {
		if (isprint(res->res_name[i]))
			seq_printf(s, "%c", res->res_name[i]);
		else
			seq_printf(s, "%c", '.');
	}
	if (res->res_nodeid > 0)
		seq_printf(s, "\"  \nLocal Copy, Master is node %d\n",
			   res->res_nodeid);
	else if (res->res_nodeid == 0)
		seq_printf(s, "\"  \nMaster Copy\n");
	else if (res->res_nodeid == -1)
		seq_printf(s, "\"  \nLooking up master (lkid %x)\n",
			   res->res_first_lkid);
	else
		seq_printf(s, "\"  \nInvalid master %d\n", res->res_nodeid);

	/* Print the LVB: */
	if (res->res_lvbptr) {
		seq_printf(s, "LVB: ");
		for (i = 0; i < lvblen; i++) {
			if (i == lvblen / 2)
				seq_printf(s, "\n     ");
			seq_printf(s, "%02x ",
				   (unsigned char) res->res_lvbptr[i]);
		}
		if (rsb_flag(res, RSB_VALNOTVALID))
			seq_printf(s, " (INVALID)");
		seq_printf(s, "\n");
	}

	/* Print the locks attached to this resource */
	seq_printf(s, "Granted Queue\n");
	list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue)
		print_lock(s, lkb, res);

	seq_printf(s, "Conversion Queue\n");
	list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue)
		print_lock(s, lkb, res);

	seq_printf(s, "Waiting Queue\n");
	list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue)
		print_lock(s, lkb, res);

	return 0;
}

static int rsb_iter_next(struct rsb_iter *ri)
{
	struct dlm_ls *ls = ri->ls;
	int i;

	if (!ri->next) {
 top:
		/* Find the next non-empty hash bucket */
		for (i = ri->entry; i < ls->ls_rsbtbl_size; i++) {
			read_lock(&ls->ls_rsbtbl[i].lock);
			if (!list_empty(&ls->ls_rsbtbl[i].list)) {
				ri->next = ls->ls_rsbtbl[i].list.next;
				read_unlock(&ls->ls_rsbtbl[i].lock);
				break;
			}
			read_unlock(&ls->ls_rsbtbl[i].lock);
                }
		ri->entry = i;

		if (ri->entry >= ls->ls_rsbtbl_size)
			return 1;
	} else {
		i = ri->entry;
		read_lock(&ls->ls_rsbtbl[i].lock);
		ri->next = ri->next->next;
		if (ri->next->next == ls->ls_rsbtbl[i].list.next) {
			/* End of list - move to next bucket */
			ri->next = NULL;
			ri->entry++;
			read_unlock(&ls->ls_rsbtbl[i].lock);
			goto top;
                }
		read_unlock(&ls->ls_rsbtbl[i].lock);
	}
	ri->rsb = list_entry(ri->next, struct dlm_rsb, res_hashchain);

	return 0;
}

static void rsb_iter_free(struct rsb_iter *ri)
{
	kfree(ri);
}

static struct rsb_iter *rsb_iter_init(struct dlm_ls *ls)
{
	struct rsb_iter *ri;

	ri = kmalloc(sizeof *ri, GFP_KERNEL);
	if (!ri)
		return NULL;

	ri->ls = ls;
	ri->entry = 0;
	ri->next = NULL;

	if (rsb_iter_next(ri)) {
		rsb_iter_free(ri);
		return NULL;
	}

	return ri;
}

static void *seq_start(struct seq_file *file, loff_t *pos)
{
	struct rsb_iter *ri;
	loff_t n = *pos;

	ri = rsb_iter_init(file->private);
	if (!ri)
		return NULL;

	while (n--) {
		if (rsb_iter_next(ri)) {
			rsb_iter_free(ri);
			return NULL;
		}
	}

	return ri;
}

static void *seq_next(struct seq_file *file, void *iter_ptr, loff_t *pos)
{
	struct rsb_iter *ri = iter_ptr;

	(*pos)++;

	if (rsb_iter_next(ri)) {
		rsb_iter_free(ri);
		return NULL;
	}

	return ri;
}

static void seq_stop(struct seq_file *file, void *iter_ptr)
{
	/* nothing for now */
}

static int seq_show(struct seq_file *file, void *iter_ptr)
{
	struct rsb_iter *ri = iter_ptr;

	print_resource(ri->rsb, file);

	return 0;
}

static struct seq_operations dlm_seq_ops = {
	.start = seq_start,
	.next  = seq_next,
	.stop  = seq_stop,
	.show  = seq_show,
};

static int do_open(struct inode *inode, struct file *file)
{
	struct seq_file *seq;
	int ret;

	ret = seq_open(file, &dlm_seq_ops);
	if (ret)
		return ret;

	seq = file->private_data;
	seq->private = inode->u.generic_ip;

	return 0;
}

static struct file_operations dlm_fops = {
	.owner   = THIS_MODULE,
	.open    = do_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release
};

int dlm_create_debug_file(struct dlm_ls *ls)
{
	ls->ls_debug_dentry = debugfs_create_file(ls->ls_name,
						  S_IFREG | S_IRUGO,
						  dlm_root,
						  ls,
						  &dlm_fops);
	return ls->ls_debug_dentry ? 0 : -ENOMEM;
}

void dlm_delete_debug_file(struct dlm_ls *ls)
{
	if (ls->ls_debug_dentry)
		debugfs_remove(ls->ls_debug_dentry);
}

int dlm_register_debugfs(void)
{
	dlm_root = debugfs_create_dir("dlm", NULL);
	return dlm_root ? 0 : -ENOMEM;
}

void dlm_unregister_debugfs(void)
{
	debugfs_remove(dlm_root);
}