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1 /**
2 * debugfs interface for sunrpc
3 *
4 * (c) 2014 Jeff Layton <jlayton@primarydata.com>
5 */
6
7 #include <linux/debugfs.h>
8 #include <linux/sunrpc/sched.h>
9 #include <linux/sunrpc/clnt.h>
10 #include "netns.h"
11
12 static struct dentry *topdir;
13 static struct dentry *rpc_fault_dir;
14 static struct dentry *rpc_clnt_dir;
15 static struct dentry *rpc_xprt_dir;
16
17 unsigned int rpc_inject_disconnect;
18
19 struct rpc_clnt_iter {
20 struct rpc_clnt *clnt;
21 loff_t pos;
22 };
23
24 static int
25 tasks_show(struct seq_file *f, void *v)
26 {
27 u32 xid = 0;
28 struct rpc_task *task = v;
29 struct rpc_clnt *clnt = task->tk_client;
30 const char *rpc_waitq = "none";
31
32 if (RPC_IS_QUEUED(task))
33 rpc_waitq = rpc_qname(task->tk_waitqueue);
34
35 if (task->tk_rqstp)
36 xid = be32_to_cpu(task->tk_rqstp->rq_xid);
37
38 seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n",
39 task->tk_pid, task->tk_flags, task->tk_status,
40 clnt->cl_clid, xid, task->tk_timeout, task->tk_ops,
41 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
42 task->tk_action, rpc_waitq);
43 return 0;
44 }
45
46 static void *
47 tasks_start(struct seq_file *f, loff_t *ppos)
48 __acquires(&clnt->cl_lock)
49 {
50 struct rpc_clnt_iter *iter = f->private;
51 loff_t pos = *ppos;
52 struct rpc_clnt *clnt = iter->clnt;
53 struct rpc_task *task;
54
55 iter->pos = pos + 1;
56 spin_lock(&clnt->cl_lock);
57 list_for_each_entry(task, &clnt->cl_tasks, tk_task)
58 if (pos-- == 0)
59 return task;
60 return NULL;
61 }
62
63 static void *
64 tasks_next(struct seq_file *f, void *v, loff_t *pos)
65 {
66 struct rpc_clnt_iter *iter = f->private;
67 struct rpc_clnt *clnt = iter->clnt;
68 struct rpc_task *task = v;
69 struct list_head *next = task->tk_task.next;
70
71 ++iter->pos;
72 ++*pos;
73
74 /* If there's another task on list, return it */
75 if (next == &clnt->cl_tasks)
76 return NULL;
77 return list_entry(next, struct rpc_task, tk_task);
78 }
79
80 static void
81 tasks_stop(struct seq_file *f, void *v)
82 __releases(&clnt->cl_lock)
83 {
84 struct rpc_clnt_iter *iter = f->private;
85 struct rpc_clnt *clnt = iter->clnt;
86
87 spin_unlock(&clnt->cl_lock);
88 }
89
90 static const struct seq_operations tasks_seq_operations = {
91 .start = tasks_start,
92 .next = tasks_next,
93 .stop = tasks_stop,
94 .show = tasks_show,
95 };
96
97 static int tasks_open(struct inode *inode, struct file *filp)
98 {
99 int ret = seq_open_private(filp, &tasks_seq_operations,
100 sizeof(struct rpc_clnt_iter));
101
102 if (!ret) {
103 struct seq_file *seq = filp->private_data;
104 struct rpc_clnt_iter *iter = seq->private;
105
106 iter->clnt = inode->i_private;
107
108 if (!atomic_inc_not_zero(&iter->clnt->cl_count)) {
109 seq_release_private(inode, filp);
110 ret = -EINVAL;
111 }
112 }
113
114 return ret;
115 }
116
117 static int
118 tasks_release(struct inode *inode, struct file *filp)
119 {
120 struct seq_file *seq = filp->private_data;
121 struct rpc_clnt_iter *iter = seq->private;
122
123 rpc_release_client(iter->clnt);
124 return seq_release_private(inode, filp);
125 }
126
127 static const struct file_operations tasks_fops = {
128 .owner = THIS_MODULE,
129 .open = tasks_open,
130 .read = seq_read,
131 .llseek = seq_lseek,
132 .release = tasks_release,
133 };
134
135 void
136 rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
137 {
138 int len;
139 char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
140 struct rpc_xprt *xprt;
141
142 /* Already registered? */
143 if (clnt->cl_debugfs || !rpc_clnt_dir)
144 return;
145
146 len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
147 if (len >= sizeof(name))
148 return;
149
150 /* make the per-client dir */
151 clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
152 if (!clnt->cl_debugfs)
153 return;
154
155 /* make tasks file */
156 if (!debugfs_create_file("tasks", S_IFREG | S_IRUSR, clnt->cl_debugfs,
157 clnt, &tasks_fops))
158 goto out_err;
159
160 rcu_read_lock();
161 xprt = rcu_dereference(clnt->cl_xprt);
162 /* no "debugfs" dentry? Don't bother with the symlink. */
163 if (!xprt->debugfs) {
164 rcu_read_unlock();
165 return;
166 }
167 len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
168 xprt->debugfs->d_name.name);
169 rcu_read_unlock();
170
171 if (len >= sizeof(name))
172 goto out_err;
173
174 if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name))
175 goto out_err;
176
177 return;
178 out_err:
179 debugfs_remove_recursive(clnt->cl_debugfs);
180 clnt->cl_debugfs = NULL;
181 }
182
183 void
184 rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
185 {
186 debugfs_remove_recursive(clnt->cl_debugfs);
187 clnt->cl_debugfs = NULL;
188 }
189
190 static int
191 xprt_info_show(struct seq_file *f, void *v)
192 {
193 struct rpc_xprt *xprt = f->private;
194
195 seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]);
196 seq_printf(f, "addr: %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
197 seq_printf(f, "port: %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
198 seq_printf(f, "state: 0x%lx\n", xprt->state);
199 return 0;
200 }
201
202 static int
203 xprt_info_open(struct inode *inode, struct file *filp)
204 {
205 int ret;
206 struct rpc_xprt *xprt = inode->i_private;
207
208 ret = single_open(filp, xprt_info_show, xprt);
209
210 if (!ret) {
211 if (!xprt_get(xprt)) {
212 single_release(inode, filp);
213 ret = -EINVAL;
214 }
215 }
216 return ret;
217 }
218
219 static int
220 xprt_info_release(struct inode *inode, struct file *filp)
221 {
222 struct rpc_xprt *xprt = inode->i_private;
223
224 xprt_put(xprt);
225 return single_release(inode, filp);
226 }
227
228 static const struct file_operations xprt_info_fops = {
229 .owner = THIS_MODULE,
230 .open = xprt_info_open,
231 .read = seq_read,
232 .llseek = seq_lseek,
233 .release = xprt_info_release,
234 };
235
236 void
237 rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
238 {
239 int len, id;
240 static atomic_t cur_id;
241 char name[9]; /* 8 hex digits + NULL term */
242
243 if (!rpc_xprt_dir)
244 return;
245
246 id = (unsigned int)atomic_inc_return(&cur_id);
247
248 len = snprintf(name, sizeof(name), "%x", id);
249 if (len >= sizeof(name))
250 return;
251
252 /* make the per-client dir */
253 xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir);
254 if (!xprt->debugfs)
255 return;
256
257 /* make tasks file */
258 if (!debugfs_create_file("info", S_IFREG | S_IRUSR, xprt->debugfs,
259 xprt, &xprt_info_fops)) {
260 debugfs_remove_recursive(xprt->debugfs);
261 xprt->debugfs = NULL;
262 }
263
264 atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
265 }
266
267 void
268 rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
269 {
270 debugfs_remove_recursive(xprt->debugfs);
271 xprt->debugfs = NULL;
272 }
273
274 static int
275 fault_open(struct inode *inode, struct file *filp)
276 {
277 filp->private_data = kmalloc(128, GFP_KERNEL);
278 if (!filp->private_data)
279 return -ENOMEM;
280 return 0;
281 }
282
283 static int
284 fault_release(struct inode *inode, struct file *filp)
285 {
286 kfree(filp->private_data);
287 return 0;
288 }
289
290 static ssize_t
291 fault_disconnect_read(struct file *filp, char __user *user_buf,
292 size_t len, loff_t *offset)
293 {
294 char *buffer = (char *)filp->private_data;
295 size_t size;
296
297 size = sprintf(buffer, "%u\n", rpc_inject_disconnect);
298 return simple_read_from_buffer(user_buf, len, offset, buffer, size);
299 }
300
301 static ssize_t
302 fault_disconnect_write(struct file *filp, const char __user *user_buf,
303 size_t len, loff_t *offset)
304 {
305 char buffer[16];
306
307 if (len >= sizeof(buffer))
308 len = sizeof(buffer) - 1;
309 if (copy_from_user(buffer, user_buf, len))
310 return -EFAULT;
311 buffer[len] = '\0';
312 if (kstrtouint(buffer, 10, &rpc_inject_disconnect))
313 return -EINVAL;
314 return len;
315 }
316
317 static const struct file_operations fault_disconnect_fops = {
318 .owner = THIS_MODULE,
319 .open = fault_open,
320 .read = fault_disconnect_read,
321 .write = fault_disconnect_write,
322 .release = fault_release,
323 };
324
325 static struct dentry *
326 inject_fault_dir(struct dentry *topdir)
327 {
328 struct dentry *faultdir;
329
330 faultdir = debugfs_create_dir("inject_fault", topdir);
331 if (!faultdir)
332 return NULL;
333
334 if (!debugfs_create_file("disconnect", S_IFREG | S_IRUSR, faultdir,
335 NULL, &fault_disconnect_fops))
336 return NULL;
337
338 return faultdir;
339 }
340
341 void __exit
342 sunrpc_debugfs_exit(void)
343 {
344 debugfs_remove_recursive(topdir);
345 topdir = NULL;
346 rpc_fault_dir = NULL;
347 rpc_clnt_dir = NULL;
348 rpc_xprt_dir = NULL;
349 }
350
351 void __init
352 sunrpc_debugfs_init(void)
353 {
354 topdir = debugfs_create_dir("sunrpc", NULL);
355 if (!topdir)
356 return;
357
358 rpc_fault_dir = inject_fault_dir(topdir);
359 if (!rpc_fault_dir)
360 goto out_remove;
361
362 rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
363 if (!rpc_clnt_dir)
364 goto out_remove;
365
366 rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
367 if (!rpc_xprt_dir)
368 goto out_remove;
369
370 return;
371 out_remove:
372 debugfs_remove_recursive(topdir);
373 topdir = NULL;
374 rpc_fault_dir = NULL;
375 rpc_clnt_dir = NULL;
376 }