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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/cluster/netdebug.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * netdebug.c
  5  *
  6  * debug functionality for o2net
  7  *
  8  * Copyright (C) 2005, 2008 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  *
 25  */
 26 
 27 #ifdef CONFIG_DEBUG_FS
 28 
 29 #include <linux/module.h>
 30 #include <linux/types.h>
 31 #include <linux/slab.h>
 32 #include <linux/idr.h>
 33 #include <linux/kref.h>
 34 #include <linux/seq_file.h>
 35 #include <linux/debugfs.h>
 36 
 37 #include <linux/uaccess.h>
 38 
 39 #include "tcp.h"
 40 #include "nodemanager.h"
 41 #define MLOG_MASK_PREFIX ML_TCP
 42 #include "masklog.h"
 43 
 44 #include "tcp_internal.h"
 45 
 46 #define O2NET_DEBUG_DIR         "o2net"
 47 #define SC_DEBUG_NAME           "sock_containers"
 48 #define NST_DEBUG_NAME          "send_tracking"
 49 #define STATS_DEBUG_NAME        "stats"
 50 #define NODES_DEBUG_NAME        "connected_nodes"
 51 
 52 #define SHOW_SOCK_CONTAINERS    0
 53 #define SHOW_SOCK_STATS         1
 54 
 55 static struct dentry *o2net_dentry;
 56 static struct dentry *sc_dentry;
 57 static struct dentry *nst_dentry;
 58 static struct dentry *stats_dentry;
 59 static struct dentry *nodes_dentry;
 60 
 61 static DEFINE_SPINLOCK(o2net_debug_lock);
 62 
 63 static LIST_HEAD(sock_containers);
 64 static LIST_HEAD(send_tracking);
 65 
 66 void o2net_debug_add_nst(struct o2net_send_tracking *nst)
 67 {
 68         spin_lock(&o2net_debug_lock);
 69         list_add(&nst->st_net_debug_item, &send_tracking);
 70         spin_unlock(&o2net_debug_lock);
 71 }
 72 
 73 void o2net_debug_del_nst(struct o2net_send_tracking *nst)
 74 {
 75         spin_lock(&o2net_debug_lock);
 76         if (!list_empty(&nst->st_net_debug_item))
 77                 list_del_init(&nst->st_net_debug_item);
 78         spin_unlock(&o2net_debug_lock);
 79 }
 80 
 81 static struct o2net_send_tracking
 82                         *next_nst(struct o2net_send_tracking *nst_start)
 83 {
 84         struct o2net_send_tracking *nst, *ret = NULL;
 85 
 86         assert_spin_locked(&o2net_debug_lock);
 87 
 88         list_for_each_entry(nst, &nst_start->st_net_debug_item,
 89                             st_net_debug_item) {
 90                 /* discover the head of the list */
 91                 if (&nst->st_net_debug_item == &send_tracking)
 92                         break;
 93 
 94                 /* use st_task to detect real nsts in the list */
 95                 if (nst->st_task != NULL) {
 96                         ret = nst;
 97                         break;
 98                 }
 99         }
100 
101         return ret;
102 }
103 
104 static void *nst_seq_start(struct seq_file *seq, loff_t *pos)
105 {
106         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
107 
108         spin_lock(&o2net_debug_lock);
109         nst = next_nst(dummy_nst);
110         spin_unlock(&o2net_debug_lock);
111 
112         return nst;
113 }
114 
115 static void *nst_seq_next(struct seq_file *seq, void *v, loff_t *pos)
116 {
117         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
118 
119         spin_lock(&o2net_debug_lock);
120         nst = next_nst(dummy_nst);
121         list_del_init(&dummy_nst->st_net_debug_item);
122         if (nst)
123                 list_add(&dummy_nst->st_net_debug_item,
124                          &nst->st_net_debug_item);
125         spin_unlock(&o2net_debug_lock);
126 
127         return nst; /* unused, just needs to be null when done */
128 }
129 
130 static int nst_seq_show(struct seq_file *seq, void *v)
131 {
132         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
133         ktime_t now;
134         s64 sock, send, status;
135 
136         spin_lock(&o2net_debug_lock);
137         nst = next_nst(dummy_nst);
138         if (!nst)
139                 goto out;
140 
141         now = ktime_get();
142         sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
143         send = ktime_to_us(ktime_sub(now, nst->st_send_time));
144         status = ktime_to_us(ktime_sub(now, nst->st_status_time));
145 
146         /* get_task_comm isn't exported.  oh well. */
147         seq_printf(seq, "%p:\n"
148                    "  pid:          %lu\n"
149                    "  tgid:         %lu\n"
150                    "  process name: %s\n"
151                    "  node:         %u\n"
152                    "  sc:           %p\n"
153                    "  message id:   %d\n"
154                    "  message type: %u\n"
155                    "  message key:  0x%08x\n"
156                    "  sock acquiry: %lld usecs ago\n"
157                    "  send start:   %lld usecs ago\n"
158                    "  wait start:   %lld usecs ago\n",
159                    nst, (unsigned long)task_pid_nr(nst->st_task),
160                    (unsigned long)nst->st_task->tgid,
161                    nst->st_task->comm, nst->st_node,
162                    nst->st_sc, nst->st_id, nst->st_msg_type,
163                    nst->st_msg_key,
164                    (long long)sock,
165                    (long long)send,
166                    (long long)status);
167 
168 out:
169         spin_unlock(&o2net_debug_lock);
170 
171         return 0;
172 }
173 
174 static void nst_seq_stop(struct seq_file *seq, void *v)
175 {
176 }
177 
178 static const struct seq_operations nst_seq_ops = {
179         .start = nst_seq_start,
180         .next = nst_seq_next,
181         .stop = nst_seq_stop,
182         .show = nst_seq_show,
183 };
184 
185 static int nst_fop_open(struct inode *inode, struct file *file)
186 {
187         struct o2net_send_tracking *dummy_nst;
188         struct seq_file *seq;
189         int ret;
190 
191         dummy_nst = kmalloc(sizeof(struct o2net_send_tracking), GFP_KERNEL);
192         if (dummy_nst == NULL) {
193                 ret = -ENOMEM;
194                 goto out;
195         }
196         dummy_nst->st_task = NULL;
197 
198         ret = seq_open(file, &nst_seq_ops);
199         if (ret)
200                 goto out;
201 
202         seq = file->private_data;
203         seq->private = dummy_nst;
204         o2net_debug_add_nst(dummy_nst);
205 
206         dummy_nst = NULL;
207 
208 out:
209         kfree(dummy_nst);
210         return ret;
211 }
212 
213 static int nst_fop_release(struct inode *inode, struct file *file)
214 {
215         struct seq_file *seq = file->private_data;
216         struct o2net_send_tracking *dummy_nst = seq->private;
217 
218         o2net_debug_del_nst(dummy_nst);
219         return seq_release_private(inode, file);
220 }
221 
222 static const struct file_operations nst_seq_fops = {
223         .open = nst_fop_open,
224         .read = seq_read,
225         .llseek = seq_lseek,
226         .release = nst_fop_release,
227 };
228 
229 void o2net_debug_add_sc(struct o2net_sock_container *sc)
230 {
231         spin_lock(&o2net_debug_lock);
232         list_add(&sc->sc_net_debug_item, &sock_containers);
233         spin_unlock(&o2net_debug_lock);
234 }
235 
236 void o2net_debug_del_sc(struct o2net_sock_container *sc)
237 {
238         spin_lock(&o2net_debug_lock);
239         list_del_init(&sc->sc_net_debug_item);
240         spin_unlock(&o2net_debug_lock);
241 }
242 
243 struct o2net_sock_debug {
244         int dbg_ctxt;
245         struct o2net_sock_container *dbg_sock;
246 };
247 
248 static struct o2net_sock_container
249                         *next_sc(struct o2net_sock_container *sc_start)
250 {
251         struct o2net_sock_container *sc, *ret = NULL;
252 
253         assert_spin_locked(&o2net_debug_lock);
254 
255         list_for_each_entry(sc, &sc_start->sc_net_debug_item,
256                             sc_net_debug_item) {
257                 /* discover the head of the list miscast as a sc */
258                 if (&sc->sc_net_debug_item == &sock_containers)
259                         break;
260 
261                 /* use sc_page to detect real scs in the list */
262                 if (sc->sc_page != NULL) {
263                         ret = sc;
264                         break;
265                 }
266         }
267 
268         return ret;
269 }
270 
271 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
272 {
273         struct o2net_sock_debug *sd = seq->private;
274         struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
275 
276         spin_lock(&o2net_debug_lock);
277         sc = next_sc(dummy_sc);
278         spin_unlock(&o2net_debug_lock);
279 
280         return sc;
281 }
282 
283 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
284 {
285         struct o2net_sock_debug *sd = seq->private;
286         struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
287 
288         spin_lock(&o2net_debug_lock);
289         sc = next_sc(dummy_sc);
290         list_del_init(&dummy_sc->sc_net_debug_item);
291         if (sc)
292                 list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
293         spin_unlock(&o2net_debug_lock);
294 
295         return sc; /* unused, just needs to be null when done */
296 }
297 
298 #ifdef CONFIG_OCFS2_FS_STATS
299 # define sc_send_count(_s)              ((_s)->sc_send_count)
300 # define sc_recv_count(_s)              ((_s)->sc_recv_count)
301 # define sc_tv_acquiry_total_ns(_s)     (ktime_to_ns((_s)->sc_tv_acquiry_total))
302 # define sc_tv_send_total_ns(_s)        (ktime_to_ns((_s)->sc_tv_send_total))
303 # define sc_tv_status_total_ns(_s)      (ktime_to_ns((_s)->sc_tv_status_total))
304 # define sc_tv_process_total_ns(_s)     (ktime_to_ns((_s)->sc_tv_process_total))
305 #else
306 # define sc_send_count(_s)              (0U)
307 # define sc_recv_count(_s)              (0U)
308 # define sc_tv_acquiry_total_ns(_s)     (0LL)
309 # define sc_tv_send_total_ns(_s)        (0LL)
310 # define sc_tv_status_total_ns(_s)      (0LL)
311 # define sc_tv_process_total_ns(_s)     (0LL)
312 #endif
313 
314 /* So that debugfs.ocfs2 can determine which format is being used */
315 #define O2NET_STATS_STR_VERSION         1
316 static void sc_show_sock_stats(struct seq_file *seq,
317                                struct o2net_sock_container *sc)
318 {
319         if (!sc)
320                 return;
321 
322         seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
323                    sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
324                    (long long)sc_tv_acquiry_total_ns(sc),
325                    (long long)sc_tv_send_total_ns(sc),
326                    (long long)sc_tv_status_total_ns(sc),
327                    (unsigned long)sc_recv_count(sc),
328                    (long long)sc_tv_process_total_ns(sc));
329 }
330 
331 static void sc_show_sock_container(struct seq_file *seq,
332                                    struct o2net_sock_container *sc)
333 {
334         struct inet_sock *inet = NULL;
335         __be32 saddr = 0, daddr = 0;
336         __be16 sport = 0, dport = 0;
337 
338         if (!sc)
339                 return;
340 
341         if (sc->sc_sock) {
342                 inet = inet_sk(sc->sc_sock->sk);
343                 /* the stack's structs aren't sparse endian clean */
344                 saddr = (__force __be32)inet->inet_saddr;
345                 daddr = (__force __be32)inet->inet_daddr;
346                 sport = (__force __be16)inet->inet_sport;
347                 dport = (__force __be16)inet->inet_dport;
348         }
349 
350         /* XXX sigh, inet-> doesn't have sparse annotation so any
351          * use of it here generates a warning with -Wbitwise */
352         seq_printf(seq, "%p:\n"
353                    "  krefs:           %d\n"
354                    "  sock:            %pI4:%u -> "
355                                       "%pI4:%u\n"
356                    "  remote node:     %s\n"
357                    "  page off:        %zu\n"
358                    "  handshake ok:    %u\n"
359                    "  timer:           %lld usecs\n"
360                    "  data ready:      %lld usecs\n"
361                    "  advance start:   %lld usecs\n"
362                    "  advance stop:    %lld usecs\n"
363                    "  func start:      %lld usecs\n"
364                    "  func stop:       %lld usecs\n"
365                    "  func key:        0x%08x\n"
366                    "  func type:       %u\n",
367                    sc,
368                    atomic_read(&sc->sc_kref.refcount),
369                    &saddr, inet ? ntohs(sport) : 0,
370                    &daddr, inet ? ntohs(dport) : 0,
371                    sc->sc_node->nd_name,
372                    sc->sc_page_off,
373                    sc->sc_handshake_ok,
374                    (long long)ktime_to_us(sc->sc_tv_timer),
375                    (long long)ktime_to_us(sc->sc_tv_data_ready),
376                    (long long)ktime_to_us(sc->sc_tv_advance_start),
377                    (long long)ktime_to_us(sc->sc_tv_advance_stop),
378                    (long long)ktime_to_us(sc->sc_tv_func_start),
379                    (long long)ktime_to_us(sc->sc_tv_func_stop),
380                    sc->sc_msg_key,
381                    sc->sc_msg_type);
382 }
383 
384 static int sc_seq_show(struct seq_file *seq, void *v)
385 {
386         struct o2net_sock_debug *sd = seq->private;
387         struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
388 
389         spin_lock(&o2net_debug_lock);
390         sc = next_sc(dummy_sc);
391 
392         if (sc) {
393                 if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
394                         sc_show_sock_container(seq, sc);
395                 else
396                         sc_show_sock_stats(seq, sc);
397         }
398 
399         spin_unlock(&o2net_debug_lock);
400 
401         return 0;
402 }
403 
404 static void sc_seq_stop(struct seq_file *seq, void *v)
405 {
406 }
407 
408 static const struct seq_operations sc_seq_ops = {
409         .start = sc_seq_start,
410         .next = sc_seq_next,
411         .stop = sc_seq_stop,
412         .show = sc_seq_show,
413 };
414 
415 static int sc_common_open(struct file *file, struct o2net_sock_debug *sd)
416 {
417         struct o2net_sock_container *dummy_sc;
418         struct seq_file *seq;
419         int ret;
420 
421         dummy_sc = kmalloc(sizeof(struct o2net_sock_container), GFP_KERNEL);
422         if (dummy_sc == NULL) {
423                 ret = -ENOMEM;
424                 goto out;
425         }
426         dummy_sc->sc_page = NULL;
427 
428         ret = seq_open(file, &sc_seq_ops);
429         if (ret)
430                 goto out;
431 
432         seq = file->private_data;
433         seq->private = sd;
434         sd->dbg_sock = dummy_sc;
435         o2net_debug_add_sc(dummy_sc);
436 
437         dummy_sc = NULL;
438 
439 out:
440         kfree(dummy_sc);
441         return ret;
442 }
443 
444 static int sc_fop_release(struct inode *inode, struct file *file)
445 {
446         struct seq_file *seq = file->private_data;
447         struct o2net_sock_debug *sd = seq->private;
448         struct o2net_sock_container *dummy_sc = sd->dbg_sock;
449 
450         o2net_debug_del_sc(dummy_sc);
451         return seq_release_private(inode, file);
452 }
453 
454 static int stats_fop_open(struct inode *inode, struct file *file)
455 {
456         struct o2net_sock_debug *sd;
457 
458         sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
459         if (sd == NULL)
460                 return -ENOMEM;
461 
462         sd->dbg_ctxt = SHOW_SOCK_STATS;
463         sd->dbg_sock = NULL;
464 
465         return sc_common_open(file, sd);
466 }
467 
468 static const struct file_operations stats_seq_fops = {
469         .open = stats_fop_open,
470         .read = seq_read,
471         .llseek = seq_lseek,
472         .release = sc_fop_release,
473 };
474 
475 static int sc_fop_open(struct inode *inode, struct file *file)
476 {
477         struct o2net_sock_debug *sd;
478 
479         sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
480         if (sd == NULL)
481                 return -ENOMEM;
482 
483         sd->dbg_ctxt = SHOW_SOCK_CONTAINERS;
484         sd->dbg_sock = NULL;
485 
486         return sc_common_open(file, sd);
487 }
488 
489 static const struct file_operations sc_seq_fops = {
490         .open = sc_fop_open,
491         .read = seq_read,
492         .llseek = seq_lseek,
493         .release = sc_fop_release,
494 };
495 
496 static int o2net_fill_bitmap(char *buf, int len)
497 {
498         unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
499         int i = -1, out = 0;
500 
501         o2net_fill_node_map(map, sizeof(map));
502 
503         while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
504                 out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
505         out += snprintf(buf + out, PAGE_SIZE - out, "\n");
506 
507         return out;
508 }
509 
510 static int nodes_fop_open(struct inode *inode, struct file *file)
511 {
512         char *buf;
513 
514         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
515         if (!buf)
516                 return -ENOMEM;
517 
518         i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
519 
520         file->private_data = buf;
521 
522         return 0;
523 }
524 
525 static int o2net_debug_release(struct inode *inode, struct file *file)
526 {
527         kfree(file->private_data);
528         return 0;
529 }
530 
531 static ssize_t o2net_debug_read(struct file *file, char __user *buf,
532                                 size_t nbytes, loff_t *ppos)
533 {
534         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
535                                        i_size_read(file->f_mapping->host));
536 }
537 
538 static const struct file_operations nodes_fops = {
539         .open           = nodes_fop_open,
540         .release        = o2net_debug_release,
541         .read           = o2net_debug_read,
542         .llseek         = generic_file_llseek,
543 };
544 
545 void o2net_debugfs_exit(void)
546 {
547         debugfs_remove(nodes_dentry);
548         debugfs_remove(stats_dentry);
549         debugfs_remove(sc_dentry);
550         debugfs_remove(nst_dentry);
551         debugfs_remove(o2net_dentry);
552 }
553 
554 int o2net_debugfs_init(void)
555 {
556         umode_t mode = S_IFREG|S_IRUSR;
557 
558         o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
559         if (o2net_dentry)
560                 nst_dentry = debugfs_create_file(NST_DEBUG_NAME, mode,
561                                         o2net_dentry, NULL, &nst_seq_fops);
562         if (nst_dentry)
563                 sc_dentry = debugfs_create_file(SC_DEBUG_NAME, mode,
564                                         o2net_dentry, NULL, &sc_seq_fops);
565         if (sc_dentry)
566                 stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, mode,
567                                         o2net_dentry, NULL, &stats_seq_fops);
568         if (stats_dentry)
569                 nodes_dentry = debugfs_create_file(NODES_DEBUG_NAME, mode,
570                                         o2net_dentry, NULL, &nodes_fops);
571         if (nodes_dentry)
572                 return 0;
573 
574         o2net_debugfs_exit();
575         mlog_errno(-ENOMEM);
576         return -ENOMEM;
577 }
578 
579 #endif  /* CONFIG_DEBUG_FS */
580 

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