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ext4: Optimize ext4 DIO overwrites
[linux/fpc-iii.git] / fs / ocfs2 / cluster / netdebug.c
blob02bf4a1774cc3e8f783d085d92c39caeed3af168
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * netdebug.c
6 *
7 * debug functionality for o2net
8 *
9 * Copyright (C) 2005, 2008 Oracle. All rights reserved.
10 */
11
12 #ifdef CONFIG_DEBUG_FS
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/idr.h>
18 #include <linux/kref.h>
19 #include <linux/seq_file.h>
20 #include <linux/debugfs.h>
21
22 #include <linux/uaccess.h>
23
24 #include "tcp.h"
25 #include "nodemanager.h"
26 #define MLOG_MASK_PREFIX ML_TCP
27 #include "masklog.h"
28
29 #include "tcp_internal.h"
30
31 #define O2NET_DEBUG_DIR "o2net"
32 #define SC_DEBUG_NAME "sock_containers"
33 #define NST_DEBUG_NAME "send_tracking"
34 #define STATS_DEBUG_NAME "stats"
35 #define NODES_DEBUG_NAME "connected_nodes"
36
37 #define SHOW_SOCK_CONTAINERS 0
38 #define SHOW_SOCK_STATS 1
39
40 static struct dentry *o2net_dentry;
41
42 static DEFINE_SPINLOCK(o2net_debug_lock);
43
44 static LIST_HEAD(sock_containers);
45 static LIST_HEAD(send_tracking);
46
47 void o2net_debug_add_nst(struct o2net_send_tracking *nst)
48 {
49 spin_lock(&o2net_debug_lock);
50 list_add(&nst->st_net_debug_item, &send_tracking);
51 spin_unlock(&o2net_debug_lock);
52 }
53
54 void o2net_debug_del_nst(struct o2net_send_tracking *nst)
55 {
56 spin_lock(&o2net_debug_lock);
57 if (!list_empty(&nst->st_net_debug_item))
58 list_del_init(&nst->st_net_debug_item);
59 spin_unlock(&o2net_debug_lock);
60 }
61
62 static struct o2net_send_tracking
63 *next_nst(struct o2net_send_tracking *nst_start)
64 {
65 struct o2net_send_tracking *nst, *ret = NULL;
66
67 assert_spin_locked(&o2net_debug_lock);
68
69 list_for_each_entry(nst, &nst_start->st_net_debug_item,
70 st_net_debug_item) {
71 /* discover the head of the list */
72 if (&nst->st_net_debug_item == &send_tracking)
73 break;
74
75 /* use st_task to detect real nsts in the list */
76 if (nst->st_task != NULL) {
77 ret = nst;
78 break;
79 }
80 }
81
82 return ret;
83 }
84
85 static void *nst_seq_start(struct seq_file *seq, loff_t *pos)
86 {
87 struct o2net_send_tracking *nst, *dummy_nst = seq->private;
88
89 spin_lock(&o2net_debug_lock);
90 nst = next_nst(dummy_nst);
91 spin_unlock(&o2net_debug_lock);
92
93 return nst;
94 }
95
96 static void *nst_seq_next(struct seq_file *seq, void *v, loff_t *pos)
97 {
98 struct o2net_send_tracking *nst, *dummy_nst = seq->private;
99
100 spin_lock(&o2net_debug_lock);
101 nst = next_nst(dummy_nst);
102 list_del_init(&dummy_nst->st_net_debug_item);
103 if (nst)
104 list_add(&dummy_nst->st_net_debug_item,
105 &nst->st_net_debug_item);
106 spin_unlock(&o2net_debug_lock);
107
108 return nst; /* unused, just needs to be null when done */
109 }
110
111 static int nst_seq_show(struct seq_file *seq, void *v)
112 {
113 struct o2net_send_tracking *nst, *dummy_nst = seq->private;
114 ktime_t now;
115 s64 sock, send, status;
116
117 spin_lock(&o2net_debug_lock);
118 nst = next_nst(dummy_nst);
119 if (!nst)
120 goto out;
121
122 now = ktime_get();
123 sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
124 send = ktime_to_us(ktime_sub(now, nst->st_send_time));
125 status = ktime_to_us(ktime_sub(now, nst->st_status_time));
126
127 /* get_task_comm isn't exported. oh well. */
128 seq_printf(seq, "%p:\n"
129 " pid: %lu\n"
130 " tgid: %lu\n"
131 " process name: %s\n"
132 " node: %u\n"
133 " sc: %p\n"
134 " message id: %d\n"
135 " message type: %u\n"
136 " message key: 0x%08x\n"
137 " sock acquiry: %lld usecs ago\n"
138 " send start: %lld usecs ago\n"
139 " wait start: %lld usecs ago\n",
140 nst, (unsigned long)task_pid_nr(nst->st_task),
141 (unsigned long)nst->st_task->tgid,
142 nst->st_task->comm, nst->st_node,
143 nst->st_sc, nst->st_id, nst->st_msg_type,
144 nst->st_msg_key,
145 (long long)sock,
146 (long long)send,
147 (long long)status);
148
149 out:
150 spin_unlock(&o2net_debug_lock);
151
152 return 0;
153 }
154
155 static void nst_seq_stop(struct seq_file *seq, void *v)
156 {
157 }
158
159 static const struct seq_operations nst_seq_ops = {
160 .start = nst_seq_start,
161 .next = nst_seq_next,
162 .stop = nst_seq_stop,
163 .show = nst_seq_show,
164 };
165
166 static int nst_fop_open(struct inode *inode, struct file *file)
167 {
168 struct o2net_send_tracking *dummy_nst;
169
170 dummy_nst = __seq_open_private(file, &nst_seq_ops, sizeof(*dummy_nst));
171 if (!dummy_nst)
172 return -ENOMEM;
173 o2net_debug_add_nst(dummy_nst);
174
175 return 0;
176 }
177
178 static int nst_fop_release(struct inode *inode, struct file *file)
179 {
180 struct seq_file *seq = file->private_data;
181 struct o2net_send_tracking *dummy_nst = seq->private;
182
183 o2net_debug_del_nst(dummy_nst);
184 return seq_release_private(inode, file);
185 }
186
187 static const struct file_operations nst_seq_fops = {
188 .open = nst_fop_open,
189 .read = seq_read,
190 .llseek = seq_lseek,
191 .release = nst_fop_release,
192 };
193
194 void o2net_debug_add_sc(struct o2net_sock_container *sc)
195 {
196 spin_lock(&o2net_debug_lock);
197 list_add(&sc->sc_net_debug_item, &sock_containers);
198 spin_unlock(&o2net_debug_lock);
199 }
200
201 void o2net_debug_del_sc(struct o2net_sock_container *sc)
202 {
203 spin_lock(&o2net_debug_lock);
204 list_del_init(&sc->sc_net_debug_item);
205 spin_unlock(&o2net_debug_lock);
206 }
207
208 struct o2net_sock_debug {
209 int dbg_ctxt;
210 struct o2net_sock_container *dbg_sock;
211 };
212
213 static struct o2net_sock_container
214 *next_sc(struct o2net_sock_container *sc_start)
215 {
216 struct o2net_sock_container *sc, *ret = NULL;
217
218 assert_spin_locked(&o2net_debug_lock);
219
220 list_for_each_entry(sc, &sc_start->sc_net_debug_item,
221 sc_net_debug_item) {
222 /* discover the head of the list miscast as a sc */
223 if (&sc->sc_net_debug_item == &sock_containers)
224 break;
225
226 /* use sc_page to detect real scs in the list */
227 if (sc->sc_page != NULL) {
228 ret = sc;
229 break;
230 }
231 }
232
233 return ret;
234 }
235
236 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
237 {
238 struct o2net_sock_debug *sd = seq->private;
239 struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
240
241 spin_lock(&o2net_debug_lock);
242 sc = next_sc(dummy_sc);
243 spin_unlock(&o2net_debug_lock);
244
245 return sc;
246 }
247
248 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
249 {
250 struct o2net_sock_debug *sd = seq->private;
251 struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
252
253 spin_lock(&o2net_debug_lock);
254 sc = next_sc(dummy_sc);
255 list_del_init(&dummy_sc->sc_net_debug_item);
256 if (sc)
257 list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
258 spin_unlock(&o2net_debug_lock);
259
260 return sc; /* unused, just needs to be null when done */
261 }
262
263 #ifdef CONFIG_OCFS2_FS_STATS
264 # define sc_send_count(_s) ((_s)->sc_send_count)
265 # define sc_recv_count(_s) ((_s)->sc_recv_count)
266 # define sc_tv_acquiry_total_ns(_s) (ktime_to_ns((_s)->sc_tv_acquiry_total))
267 # define sc_tv_send_total_ns(_s) (ktime_to_ns((_s)->sc_tv_send_total))
268 # define sc_tv_status_total_ns(_s) (ktime_to_ns((_s)->sc_tv_status_total))
269 # define sc_tv_process_total_ns(_s) (ktime_to_ns((_s)->sc_tv_process_total))
270 #else
271 # define sc_send_count(_s) (0U)
272 # define sc_recv_count(_s) (0U)
273 # define sc_tv_acquiry_total_ns(_s) (0LL)
274 # define sc_tv_send_total_ns(_s) (0LL)
275 # define sc_tv_status_total_ns(_s) (0LL)
276 # define sc_tv_process_total_ns(_s) (0LL)
277 #endif
278
279 /* So that debugfs.ocfs2 can determine which format is being used */
280 #define O2NET_STATS_STR_VERSION 1
281 static void sc_show_sock_stats(struct seq_file *seq,
282 struct o2net_sock_container *sc)
283 {
284 if (!sc)
285 return;
286
287 seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
288 sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
289 (long long)sc_tv_acquiry_total_ns(sc),
290 (long long)sc_tv_send_total_ns(sc),
291 (long long)sc_tv_status_total_ns(sc),
292 (unsigned long)sc_recv_count(sc),
293 (long long)sc_tv_process_total_ns(sc));
294 }
295
296 static void sc_show_sock_container(struct seq_file *seq,
297 struct o2net_sock_container *sc)
298 {
299 struct inet_sock *inet = NULL;
300 __be32 saddr = 0, daddr = 0;
301 __be16 sport = 0, dport = 0;
302
303 if (!sc)
304 return;
305
306 if (sc->sc_sock) {
307 inet = inet_sk(sc->sc_sock->sk);
308 /* the stack's structs aren't sparse endian clean */
309 saddr = (__force __be32)inet->inet_saddr;
310 daddr = (__force __be32)inet->inet_daddr;
311 sport = (__force __be16)inet->inet_sport;
312 dport = (__force __be16)inet->inet_dport;
313 }
314
315 /* XXX sigh, inet-> doesn't have sparse annotation so any
316 * use of it here generates a warning with -Wbitwise */
317 seq_printf(seq, "%p:\n"
318 " krefs: %d\n"
319 " sock: %pI4:%u -> "
320 "%pI4:%u\n"
321 " remote node: %s\n"
322 " page off: %zu\n"
323 " handshake ok: %u\n"
324 " timer: %lld usecs\n"
325 " data ready: %lld usecs\n"
326 " advance start: %lld usecs\n"
327 " advance stop: %lld usecs\n"
328 " func start: %lld usecs\n"
329 " func stop: %lld usecs\n"
330 " func key: 0x%08x\n"
331 " func type: %u\n",
332 sc,
333 kref_read(&sc->sc_kref),
334 &saddr, inet ? ntohs(sport) : 0,
335 &daddr, inet ? ntohs(dport) : 0,
336 sc->sc_node->nd_name,
337 sc->sc_page_off,
338 sc->sc_handshake_ok,
339 (long long)ktime_to_us(sc->sc_tv_timer),
340 (long long)ktime_to_us(sc->sc_tv_data_ready),
341 (long long)ktime_to_us(sc->sc_tv_advance_start),
342 (long long)ktime_to_us(sc->sc_tv_advance_stop),
343 (long long)ktime_to_us(sc->sc_tv_func_start),
344 (long long)ktime_to_us(sc->sc_tv_func_stop),
345 sc->sc_msg_key,
346 sc->sc_msg_type);
347 }
348
349 static int sc_seq_show(struct seq_file *seq, void *v)
350 {
351 struct o2net_sock_debug *sd = seq->private;
352 struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
353
354 spin_lock(&o2net_debug_lock);
355 sc = next_sc(dummy_sc);
356
357 if (sc) {
358 if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
359 sc_show_sock_container(seq, sc);
360 else
361 sc_show_sock_stats(seq, sc);
362 }
363
364 spin_unlock(&o2net_debug_lock);
365
366 return 0;
367 }
368
369 static void sc_seq_stop(struct seq_file *seq, void *v)
370 {
371 }
372
373 static const struct seq_operations sc_seq_ops = {
374 .start = sc_seq_start,
375 .next = sc_seq_next,
376 .stop = sc_seq_stop,
377 .show = sc_seq_show,
378 };
379
380 static int sc_common_open(struct file *file, int ctxt)
381 {
382 struct o2net_sock_debug *sd;
383 struct o2net_sock_container *dummy_sc;
384
385 dummy_sc = kzalloc(sizeof(*dummy_sc), GFP_KERNEL);
386 if (!dummy_sc)
387 return -ENOMEM;
388
389 sd = __seq_open_private(file, &sc_seq_ops, sizeof(*sd));
390 if (!sd) {
391 kfree(dummy_sc);
392 return -ENOMEM;
393 }
394
395 sd->dbg_ctxt = ctxt;
396 sd->dbg_sock = dummy_sc;
397
398 o2net_debug_add_sc(dummy_sc);
399
400 return 0;
401 }
402
403 static int sc_fop_release(struct inode *inode, struct file *file)
404 {
405 struct seq_file *seq = file->private_data;
406 struct o2net_sock_debug *sd = seq->private;
407 struct o2net_sock_container *dummy_sc = sd->dbg_sock;
408
409 o2net_debug_del_sc(dummy_sc);
410 kfree(dummy_sc);
411 return seq_release_private(inode, file);
412 }
413
414 static int stats_fop_open(struct inode *inode, struct file *file)
415 {
416 return sc_common_open(file, SHOW_SOCK_STATS);
417 }
418
419 static const struct file_operations stats_seq_fops = {
420 .open = stats_fop_open,
421 .read = seq_read,
422 .llseek = seq_lseek,
423 .release = sc_fop_release,
424 };
425
426 static int sc_fop_open(struct inode *inode, struct file *file)
427 {
428 return sc_common_open(file, SHOW_SOCK_CONTAINERS);
429 }
430
431 static const struct file_operations sc_seq_fops = {
432 .open = sc_fop_open,
433 .read = seq_read,
434 .llseek = seq_lseek,
435 .release = sc_fop_release,
436 };
437
438 static int o2net_fill_bitmap(char *buf, int len)
439 {
440 unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
441 int i = -1, out = 0;
442
443 o2net_fill_node_map(map, sizeof(map));
444
445 while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
446 out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
447 out += snprintf(buf + out, PAGE_SIZE - out, "\n");
448
449 return out;
450 }
451
452 static int nodes_fop_open(struct inode *inode, struct file *file)
453 {
454 char *buf;
455
456 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
457 if (!buf)
458 return -ENOMEM;
459
460 i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
461
462 file->private_data = buf;
463
464 return 0;
465 }
466
467 static int o2net_debug_release(struct inode *inode, struct file *file)
468 {
469 kfree(file->private_data);
470 return 0;
471 }
472
473 static ssize_t o2net_debug_read(struct file *file, char __user *buf,
474 size_t nbytes, loff_t *ppos)
475 {
476 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
477 i_size_read(file->f_mapping->host));
478 }
479
480 static const struct file_operations nodes_fops = {
481 .open = nodes_fop_open,
482 .release = o2net_debug_release,
483 .read = o2net_debug_read,
484 .llseek = generic_file_llseek,
485 };
486
487 void o2net_debugfs_exit(void)
488 {
489 debugfs_remove_recursive(o2net_dentry);
490 }
491
492 void o2net_debugfs_init(void)
493 {
494 umode_t mode = S_IFREG|S_IRUSR;
495
496 o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
497
498 debugfs_create_file(NST_DEBUG_NAME, mode, o2net_dentry, NULL,
499 &nst_seq_fops);
500 debugfs_create_file(SC_DEBUG_NAME, mode, o2net_dentry, NULL,
501 &sc_seq_fops);
502 debugfs_create_file(STATS_DEBUG_NAME, mode, o2net_dentry, NULL,
503 &stats_seq_fops);
504 debugfs_create_file(NODES_DEBUG_NAME, mode, o2net_dentry, NULL,
505 &nodes_fops);
506 }
507
508 #endif /* CONFIG_DEBUG_FS */
Linux with added FPC-III support