summaryrefslogtreecommitdiff
path: root/net/sunrpc/debugfs.c
blob: 82962f7e6e888f619ad79754f038732d5d5b6333 (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
297
298
/**
 * debugfs interface for sunrpc
 *
 * (c) 2014 Jeff Layton <jlayton@primarydata.com>
 */

#include <linux/debugfs.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/clnt.h>
#include "netns.h"

static struct dentry *topdir;
static struct dentry *rpc_clnt_dir;
static struct dentry *rpc_xprt_dir;

struct rpc_clnt_iter {
	struct rpc_clnt	*clnt;
	loff_t		pos;
};

static int
tasks_show(struct seq_file *f, void *v)
{
	u32 xid = 0;
	struct rpc_task *task = v;
	struct rpc_clnt *clnt = task->tk_client;
	const char *rpc_waitq = "none";

	if (RPC_IS_QUEUED(task))
		rpc_waitq = rpc_qname(task->tk_waitqueue);

	if (task->tk_rqstp)
		xid = be32_to_cpu(task->tk_rqstp->rq_xid);

	seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n",
		task->tk_pid, task->tk_flags, task->tk_status,
		clnt->cl_clid, xid, task->tk_timeout, task->tk_ops,
		clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
		task->tk_action, rpc_waitq);
	return 0;
}

static void *
tasks_start(struct seq_file *f, loff_t *ppos)
	__acquires(&clnt->cl_lock)
{
	struct rpc_clnt_iter *iter = f->private;
	loff_t pos = *ppos;
	struct rpc_clnt *clnt = iter->clnt;
	struct rpc_task *task;

	iter->pos = pos + 1;
	spin_lock(&clnt->cl_lock);
	list_for_each_entry(task, &clnt->cl_tasks, tk_task)
		if (pos-- == 0)
			return task;
	return NULL;
}

static void *
tasks_next(struct seq_file *f, void *v, loff_t *pos)
{
	struct rpc_clnt_iter *iter = f->private;
	struct rpc_clnt *clnt = iter->clnt;
	struct rpc_task *task = v;
	struct list_head *next = task->tk_task.next;

	++iter->pos;
	++*pos;

	/* If there's another task on list, return it */
	if (next == &clnt->cl_tasks)
		return NULL;
	return list_entry(next, struct rpc_task, tk_task);
}

static void
tasks_stop(struct seq_file *f, void *v)
	__releases(&clnt->cl_lock)
{
	struct rpc_clnt_iter *iter = f->private;
	struct rpc_clnt *clnt = iter->clnt;

	spin_unlock(&clnt->cl_lock);
}

static const struct seq_operations tasks_seq_operations = {
	.start	= tasks_start,
	.next	= tasks_next,
	.stop	= tasks_stop,
	.show	= tasks_show,
};

static int tasks_open(struct inode *inode, struct file *filp)
{
	int ret = seq_open_private(filp, &tasks_seq_operations,
					sizeof(struct rpc_clnt_iter));

	if (!ret) {
		struct seq_file *seq = filp->private_data;
		struct rpc_clnt_iter *iter = seq->private;

		iter->clnt = inode->i_private;

		if (!atomic_inc_not_zero(&iter->clnt->cl_count)) {
			seq_release_private(inode, filp);
			ret = -EINVAL;
		}
	}

	return ret;
}

static int
tasks_release(struct inode *inode, struct file *filp)
{
	struct seq_file *seq = filp->private_data;
	struct rpc_clnt_iter *iter = seq->private;

	rpc_release_client(iter->clnt);
	return seq_release_private(inode, filp);
}

static const struct file_operations tasks_fops = {
	.owner		= THIS_MODULE,
	.open		= tasks_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= tasks_release,
};

void
rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
{
	int len;
	char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
	struct rpc_xprt *xprt;

	/* Already registered? */
	if (clnt->cl_debugfs || !rpc_clnt_dir)
		return;

	len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
	if (len >= sizeof(name))
		return;

	/* make the per-client dir */
	clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
	if (!clnt->cl_debugfs)
		return;

	/* make tasks file */
	if (!debugfs_create_file("tasks", S_IFREG | S_IRUSR, clnt->cl_debugfs,
				 clnt, &tasks_fops))
		goto out_err;

	rcu_read_lock();
	xprt = rcu_dereference(clnt->cl_xprt);
	/* no "debugfs" dentry? Don't bother with the symlink. */
	if (!xprt->debugfs) {
		rcu_read_unlock();
		return;
	}
	len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
			xprt->debugfs->d_name.name);
	rcu_read_unlock();

	if (len >= sizeof(name))
		goto out_err;

	if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name))
		goto out_err;

	return;
out_err:
	debugfs_remove_recursive(clnt->cl_debugfs);
	clnt->cl_debugfs = NULL;
}

void
rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
{
	debugfs_remove_recursive(clnt->cl_debugfs);
	clnt->cl_debugfs = NULL;
}

static int
xprt_info_show(struct seq_file *f, void *v)
{
	struct rpc_xprt *xprt = f->private;

	seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]);
	seq_printf(f, "addr:  %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
	seq_printf(f, "port:  %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
	seq_printf(f, "state: 0x%lx\n", xprt->state);
	return 0;
}

static int
xprt_info_open(struct inode *inode, struct file *filp)
{
	int ret;
	struct rpc_xprt *xprt = inode->i_private;

	ret = single_open(filp, xprt_info_show, xprt);

	if (!ret) {
		if (!xprt_get(xprt)) {
			single_release(inode, filp);
			ret = -EINVAL;
		}
	}
	return ret;
}

static int
xprt_info_release(struct inode *inode, struct file *filp)
{
	struct rpc_xprt *xprt = inode->i_private;

	xprt_put(xprt);
	return single_release(inode, filp);
}

static const struct file_operations xprt_info_fops = {
	.owner		= THIS_MODULE,
	.open		= xprt_info_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= xprt_info_release,
};

void
rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
{
	int len, id;
	static atomic_t	cur_id;
	char		name[9]; /* 8 hex digits + NULL term */

	if (!rpc_xprt_dir)
		return;

	id = (unsigned int)atomic_inc_return(&cur_id);

	len = snprintf(name, sizeof(name), "%x", id);
	if (len >= sizeof(name))
		return;

	/* make the per-client dir */
	xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir);
	if (!xprt->debugfs)
		return;

	/* make tasks file */
	if (!debugfs_create_file("info", S_IFREG | S_IRUSR, xprt->debugfs,
				 xprt, &xprt_info_fops)) {
		debugfs_remove_recursive(xprt->debugfs);
		xprt->debugfs = NULL;
	}
}

void
rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
{
	debugfs_remove_recursive(xprt->debugfs);
	xprt->debugfs = NULL;
}

void __exit
sunrpc_debugfs_exit(void)
{
	debugfs_remove_recursive(topdir);
	topdir = NULL;
	rpc_clnt_dir = NULL;
	rpc_xprt_dir = NULL;
}

void __init
sunrpc_debugfs_init(void)
{
	topdir = debugfs_create_dir("sunrpc", NULL);
	if (!topdir)
		return;

	rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
	if (!rpc_clnt_dir)
		goto out_remove;

	rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
	if (!rpc_xprt_dir)
		goto out_remove;

	return;
out_remove:
	debugfs_remove_recursive(topdir);
	topdir = NULL;
	rpc_clnt_dir = NULL;
}