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Btrfs: fix easily get into ENOSPC in mixed case
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / dlm / debug_fs.c
blob6b42ba807dfda1747f7cae9fa0ecf7a3c400b5f2
1 /******************************************************************************
2 *******************************************************************************
3 **
4 ** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved.
5 **
6 ** This copyrighted material is made available to anyone wishing to use,
7 ** modify, copy, or redistribute it subject to the terms and conditions
8 ** of the GNU General Public License v.2.
9 **
10 *******************************************************************************
11 ******************************************************************************/
12
13 #include <linux/pagemap.h>
14 #include <linux/seq_file.h>
15 #include <linux/module.h>
16 #include <linux/ctype.h>
17 #include <linux/debugfs.h>
18 #include <linux/slab.h>
19
20 #include "dlm_internal.h"
21 #include "lock.h"
22
23 #define DLM_DEBUG_BUF_LEN 4096
24 static char debug_buf[DLM_DEBUG_BUF_LEN];
25 static struct mutex debug_buf_lock;
26
27 static struct dentry *dlm_root;
28
29 static char *print_lockmode(int mode)
30 {
31 switch (mode) {
32 case DLM_LOCK_IV:
33 return "--";
34 case DLM_LOCK_NL:
35 return "NL";
36 case DLM_LOCK_CR:
37 return "CR";
38 case DLM_LOCK_CW:
39 return "CW";
40 case DLM_LOCK_PR:
41 return "PR";
42 case DLM_LOCK_PW:
43 return "PW";
44 case DLM_LOCK_EX:
45 return "EX";
46 default:
47 return "??";
48 }
49 }
50
51 static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
52 struct dlm_rsb *res)
53 {
54 seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
55
56 if (lkb->lkb_status == DLM_LKSTS_CONVERT ||
57 lkb->lkb_status == DLM_LKSTS_WAITING)
58 seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
59
60 if (lkb->lkb_nodeid) {
61 if (lkb->lkb_nodeid != res->res_nodeid)
62 seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid,
63 lkb->lkb_remid);
64 else
65 seq_printf(s, " Master: %08x", lkb->lkb_remid);
66 }
67
68 if (lkb->lkb_wait_type)
69 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
70
71 return seq_printf(s, "\n");
72 }
73
74 static int print_format1(struct dlm_rsb *res, struct seq_file *s)
75 {
76 struct dlm_lkb *lkb;
77 int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
78 int rv;
79
80 lock_rsb(res);
81
82 rv = seq_printf(s, "\nResource %p Name (len=%d) \"",
83 res, res->res_length);
84 if (rv)
85 goto out;
86
87 for (i = 0; i < res->res_length; i++) {
88 if (isprint(res->res_name[i]))
89 seq_printf(s, "%c", res->res_name[i]);
90 else
91 seq_printf(s, "%c", '.');
92 }
93
94 if (res->res_nodeid > 0)
95 rv = seq_printf(s, "\" \nLocal Copy, Master is node %d\n",
96 res->res_nodeid);
97 else if (res->res_nodeid == 0)
98 rv = seq_printf(s, "\" \nMaster Copy\n");
99 else if (res->res_nodeid == -1)
100 rv = seq_printf(s, "\" \nLooking up master (lkid %x)\n",
101 res->res_first_lkid);
102 else
103 rv = seq_printf(s, "\" \nInvalid master %d\n",
104 res->res_nodeid);
105 if (rv)
106 goto out;
107
108 /* Print the LVB: */
109 if (res->res_lvbptr) {
110 seq_printf(s, "LVB: ");
111 for (i = 0; i < lvblen; i++) {
112 if (i == lvblen / 2)
113 seq_printf(s, "\n ");
114 seq_printf(s, "%02x ",
115 (unsigned char) res->res_lvbptr[i]);
116 }
117 if (rsb_flag(res, RSB_VALNOTVALID))
118 seq_printf(s, " (INVALID)");
119 rv = seq_printf(s, "\n");
120 if (rv)
121 goto out;
122 }
123
124 root_list = !list_empty(&res->res_root_list);
125 recover_list = !list_empty(&res->res_recover_list);
126
127 if (root_list || recover_list) {
128 rv = seq_printf(s, "Recovery: root %d recover %d flags %lx "
129 "count %d\n", root_list, recover_list,
130 res->res_flags, res->res_recover_locks_count);
131 if (rv)
132 goto out;
133 }
134
135 /* Print the locks attached to this resource */
136 seq_printf(s, "Granted Queue\n");
137 list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) {
138 rv = print_format1_lock(s, lkb, res);
139 if (rv)
140 goto out;
141 }
142
143 seq_printf(s, "Conversion Queue\n");
144 list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) {
145 rv = print_format1_lock(s, lkb, res);
146 if (rv)
147 goto out;
148 }
149
150 seq_printf(s, "Waiting Queue\n");
151 list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) {
152 rv = print_format1_lock(s, lkb, res);
153 if (rv)
154 goto out;
155 }
156
157 if (list_empty(&res->res_lookup))
158 goto out;
159
160 seq_printf(s, "Lookup Queue\n");
161 list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
162 rv = seq_printf(s, "%08x %s", lkb->lkb_id,
163 print_lockmode(lkb->lkb_rqmode));
164 if (lkb->lkb_wait_type)
165 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
166 rv = seq_printf(s, "\n");
167 }
168 out:
169 unlock_rsb(res);
170 return rv;
171 }
172
173 static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
174 struct dlm_rsb *r)
175 {
176 u64 xid = 0;
177 u64 us;
178 int rv;
179
180 if (lkb->lkb_flags & DLM_IFL_USER) {
181 if (lkb->lkb_ua)
182 xid = lkb->lkb_ua->xid;
183 }
184
185 /* microseconds since lkb was added to current queue */
186 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
187
188 /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
189 r_nodeid r_len r_name */
190
191 rv = seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
192 lkb->lkb_id,
193 lkb->lkb_nodeid,
194 lkb->lkb_remid,
195 lkb->lkb_ownpid,
196 (unsigned long long)xid,
197 lkb->lkb_exflags,
198 lkb->lkb_flags,
199 lkb->lkb_status,
200 lkb->lkb_grmode,
201 lkb->lkb_rqmode,
202 (unsigned long long)us,
203 r->res_nodeid,
204 r->res_length,
205 r->res_name);
206 return rv;
207 }
208
209 static int print_format2(struct dlm_rsb *r, struct seq_file *s)
210 {
211 struct dlm_lkb *lkb;
212 int rv = 0;
213
214 lock_rsb(r);
215
216 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
217 rv = print_format2_lock(s, lkb, r);
218 if (rv)
219 goto out;
220 }
221
222 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
223 rv = print_format2_lock(s, lkb, r);
224 if (rv)
225 goto out;
226 }
227
228 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
229 rv = print_format2_lock(s, lkb, r);
230 if (rv)
231 goto out;
232 }
233 out:
234 unlock_rsb(r);
235 return rv;
236 }
237
238 static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
239 int rsb_lookup)
240 {
241 u64 xid = 0;
242 int rv;
243
244 if (lkb->lkb_flags & DLM_IFL_USER) {
245 if (lkb->lkb_ua)
246 xid = lkb->lkb_ua->xid;
247 }
248
249 rv = seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
250 lkb->lkb_id,
251 lkb->lkb_nodeid,
252 lkb->lkb_remid,
253 lkb->lkb_ownpid,
254 (unsigned long long)xid,
255 lkb->lkb_exflags,
256 lkb->lkb_flags,
257 lkb->lkb_status,
258 lkb->lkb_grmode,
259 lkb->lkb_rqmode,
260 lkb->lkb_bastmode,
261 rsb_lookup,
262 lkb->lkb_wait_type,
263 lkb->lkb_lvbseq,
264 (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
265 (unsigned long long)ktime_to_ns(lkb->lkb_time_bast));
266 return rv;
267 }
268
269 static int print_format3(struct dlm_rsb *r, struct seq_file *s)
270 {
271 struct dlm_lkb *lkb;
272 int i, lvblen = r->res_ls->ls_lvblen;
273 int print_name = 1;
274 int rv;
275
276 lock_rsb(r);
277
278 rv = seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
279 r,
280 r->res_nodeid,
281 r->res_first_lkid,
282 r->res_flags,
283 !list_empty(&r->res_root_list),
284 !list_empty(&r->res_recover_list),
285 r->res_recover_locks_count,
286 r->res_length);
287 if (rv)
288 goto out;
289
290 for (i = 0; i < r->res_length; i++) {
291 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
292 print_name = 0;
293 }
294
295 seq_printf(s, "%s", print_name ? "str " : "hex");
296
297 for (i = 0; i < r->res_length; i++) {
298 if (print_name)
299 seq_printf(s, "%c", r->res_name[i]);
300 else
301 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
302 }
303 rv = seq_printf(s, "\n");
304 if (rv)
305 goto out;
306
307 if (!r->res_lvbptr)
308 goto do_locks;
309
310 seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen);
311
312 for (i = 0; i < lvblen; i++)
313 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
314 rv = seq_printf(s, "\n");
315 if (rv)
316 goto out;
317
318 do_locks:
319 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
320 rv = print_format3_lock(s, lkb, 0);
321 if (rv)
322 goto out;
323 }
324
325 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
326 rv = print_format3_lock(s, lkb, 0);
327 if (rv)
328 goto out;
329 }
330
331 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
332 rv = print_format3_lock(s, lkb, 0);
333 if (rv)
334 goto out;
335 }
336
337 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
338 rv = print_format3_lock(s, lkb, 1);
339 if (rv)
340 goto out;
341 }
342 out:
343 unlock_rsb(r);
344 return rv;
345 }
346
347 struct rsbtbl_iter {
348 struct dlm_rsb *rsb;
349 unsigned bucket;
350 int format;
351 int header;
352 };
353
354 /* seq_printf returns -1 if the buffer is full, and 0 otherwise.
355 If the buffer is full, seq_printf can be called again, but it
356 does nothing and just returns -1. So, the these printing routines
357 periodically check the return value to avoid wasting too much time
358 trying to print to a full buffer. */
359
360 static int table_seq_show(struct seq_file *seq, void *iter_ptr)
361 {
362 struct rsbtbl_iter *ri = iter_ptr;
363 int rv = 0;
364
365 switch (ri->format) {
366 case 1:
367 rv = print_format1(ri->rsb, seq);
368 break;
369 case 2:
370 if (ri->header) {
371 seq_printf(seq, "id nodeid remid pid xid exflags "
372 "flags sts grmode rqmode time_ms "
373 "r_nodeid r_len r_name\n");
374 ri->header = 0;
375 }
376 rv = print_format2(ri->rsb, seq);
377 break;
378 case 3:
379 if (ri->header) {
380 seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
381 ri->header = 0;
382 }
383 rv = print_format3(ri->rsb, seq);
384 break;
385 }
386
387 return rv;
388 }
389
390 static const struct seq_operations format1_seq_ops;
391 static const struct seq_operations format2_seq_ops;
392 static const struct seq_operations format3_seq_ops;
393
394 static void *table_seq_start(struct seq_file *seq, loff_t *pos)
395 {
396 struct dlm_ls *ls = seq->private;
397 struct rsbtbl_iter *ri;
398 struct dlm_rsb *r;
399 loff_t n = *pos;
400 unsigned bucket, entry;
401
402 bucket = n >> 32;
403 entry = n & ((1LL << 32) - 1);
404
405 if (bucket >= ls->ls_rsbtbl_size)
406 return NULL;
407
408 ri = kzalloc(sizeof(struct rsbtbl_iter), GFP_NOFS);
409 if (!ri)
410 return NULL;
411 if (n == 0)
412 ri->header = 1;
413 if (seq->op == &format1_seq_ops)
414 ri->format = 1;
415 if (seq->op == &format2_seq_ops)
416 ri->format = 2;
417 if (seq->op == &format3_seq_ops)
418 ri->format = 3;
419
420 spin_lock(&ls->ls_rsbtbl[bucket].lock);
421 if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
422 list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list,
423 res_hashchain) {
424 if (!entry--) {
425 dlm_hold_rsb(r);
426 ri->rsb = r;
427 ri->bucket = bucket;
428 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
429 return ri;
430 }
431 }
432 }
433 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
434
435 /*
436 * move to the first rsb in the next non-empty bucket
437 */
438
439 /* zero the entry */
440 n &= ~((1LL << 32) - 1);
441
442 while (1) {
443 bucket++;
444 n += 1LL << 32;
445
446 if (bucket >= ls->ls_rsbtbl_size) {
447 kfree(ri);
448 return NULL;
449 }
450
451 spin_lock(&ls->ls_rsbtbl[bucket].lock);
452 if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
453 r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
454 struct dlm_rsb, res_hashchain);
455 dlm_hold_rsb(r);
456 ri->rsb = r;
457 ri->bucket = bucket;
458 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
459 *pos = n;
460 return ri;
461 }
462 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
463 }
464 }
465
466 static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
467 {
468 struct dlm_ls *ls = seq->private;
469 struct rsbtbl_iter *ri = iter_ptr;
470 struct list_head *next;
471 struct dlm_rsb *r, *rp;
472 loff_t n = *pos;
473 unsigned bucket;
474
475 bucket = n >> 32;
476
477 /*
478 * move to the next rsb in the same bucket
479 */
480
481 spin_lock(&ls->ls_rsbtbl[bucket].lock);
482 rp = ri->rsb;
483 next = rp->res_hashchain.next;
484
485 if (next != &ls->ls_rsbtbl[bucket].list) {
486 r = list_entry(next, struct dlm_rsb, res_hashchain);
487 dlm_hold_rsb(r);
488 ri->rsb = r;
489 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
490 dlm_put_rsb(rp);
491 ++*pos;
492 return ri;
493 }
494 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
495 dlm_put_rsb(rp);
496
497 /*
498 * move to the first rsb in the next non-empty bucket
499 */
500
501 /* zero the entry */
502 n &= ~((1LL << 32) - 1);
503
504 while (1) {
505 bucket++;
506 n += 1LL << 32;
507
508 if (bucket >= ls->ls_rsbtbl_size) {
509 kfree(ri);
510 return NULL;
511 }
512
513 spin_lock(&ls->ls_rsbtbl[bucket].lock);
514 if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
515 r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
516 struct dlm_rsb, res_hashchain);
517 dlm_hold_rsb(r);
518 ri->rsb = r;
519 ri->bucket = bucket;
520 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
521 *pos = n;
522 return ri;
523 }
524 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
525 }
526 }
527
528 static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
529 {
530 struct rsbtbl_iter *ri = iter_ptr;
531
532 if (ri) {
533 dlm_put_rsb(ri->rsb);
534 kfree(ri);
535 }
536 }
537
538 static const struct seq_operations format1_seq_ops = {
539 .start = table_seq_start,
540 .next = table_seq_next,
541 .stop = table_seq_stop,
542 .show = table_seq_show,
543 };
544
545 static const struct seq_operations format2_seq_ops = {
546 .start = table_seq_start,
547 .next = table_seq_next,
548 .stop = table_seq_stop,
549 .show = table_seq_show,
550 };
551
552 static const struct seq_operations format3_seq_ops = {
553 .start = table_seq_start,
554 .next = table_seq_next,
555 .stop = table_seq_stop,
556 .show = table_seq_show,
557 };
558
559 static const struct file_operations format1_fops;
560 static const struct file_operations format2_fops;
561 static const struct file_operations format3_fops;
562
563 static int table_open(struct inode *inode, struct file *file)
564 {
565 struct seq_file *seq;
566 int ret = -1;
567
568 if (file->f_op == &format1_fops)
569 ret = seq_open(file, &format1_seq_ops);
570 else if (file->f_op == &format2_fops)
571 ret = seq_open(file, &format2_seq_ops);
572 else if (file->f_op == &format3_fops)
573 ret = seq_open(file, &format3_seq_ops);
574
575 if (ret)
576 return ret;
577
578 seq = file->private_data;
579 seq->private = inode->i_private; /* the dlm_ls */
580 return 0;
581 }
582
583 static const struct file_operations format1_fops = {
584 .owner = THIS_MODULE,
585 .open = table_open,
586 .read = seq_read,
587 .llseek = seq_lseek,
588 .release = seq_release
589 };
590
591 static const struct file_operations format2_fops = {
592 .owner = THIS_MODULE,
593 .open = table_open,
594 .read = seq_read,
595 .llseek = seq_lseek,
596 .release = seq_release
597 };
598
599 static const struct file_operations format3_fops = {
600 .owner = THIS_MODULE,
601 .open = table_open,
602 .read = seq_read,
603 .llseek = seq_lseek,
604 .release = seq_release
605 };
606
607 /*
608 * dump lkb's on the ls_waiters list
609 */
610
611 static int waiters_open(struct inode *inode, struct file *file)
612 {
613 file->private_data = inode->i_private;
614 return 0;
615 }
616
617 static ssize_t waiters_read(struct file *file, char __user *userbuf,
618 size_t count, loff_t *ppos)
619 {
620 struct dlm_ls *ls = file->private_data;
621 struct dlm_lkb *lkb;
622 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
623
624 mutex_lock(&debug_buf_lock);
625 mutex_lock(&ls->ls_waiters_mutex);
626 memset(debug_buf, 0, sizeof(debug_buf));
627
628 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
629 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
630 lkb->lkb_id, lkb->lkb_wait_type,
631 lkb->lkb_nodeid, lkb->lkb_resource->res_name);
632 if (ret >= len - pos)
633 break;
634 pos += ret;
635 }
636 mutex_unlock(&ls->ls_waiters_mutex);
637
638 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
639 mutex_unlock(&debug_buf_lock);
640 return rv;
641 }
642
643 static const struct file_operations waiters_fops = {
644 .owner = THIS_MODULE,
645 .open = waiters_open,
646 .read = waiters_read,
647 .llseek = default_llseek,
648 };
649
650 void dlm_delete_debug_file(struct dlm_ls *ls)
651 {
652 if (ls->ls_debug_rsb_dentry)
653 debugfs_remove(ls->ls_debug_rsb_dentry);
654 if (ls->ls_debug_waiters_dentry)
655 debugfs_remove(ls->ls_debug_waiters_dentry);
656 if (ls->ls_debug_locks_dentry)
657 debugfs_remove(ls->ls_debug_locks_dentry);
658 if (ls->ls_debug_all_dentry)
659 debugfs_remove(ls->ls_debug_all_dentry);
660 }
661
662 int dlm_create_debug_file(struct dlm_ls *ls)
663 {
664 char name[DLM_LOCKSPACE_LEN+8];
665
666 /* format 1 */
667
668 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
669 S_IFREG | S_IRUGO,
670 dlm_root,
671 ls,
672 &format1_fops);
673 if (!ls->ls_debug_rsb_dentry)
674 goto fail;
675
676 /* format 2 */
677
678 memset(name, 0, sizeof(name));
679 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
680
681 ls->ls_debug_locks_dentry = debugfs_create_file(name,
682 S_IFREG | S_IRUGO,
683 dlm_root,
684 ls,
685 &format2_fops);
686 if (!ls->ls_debug_locks_dentry)
687 goto fail;
688
689 /* format 3 */
690
691 memset(name, 0, sizeof(name));
692 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
693
694 ls->ls_debug_all_dentry = debugfs_create_file(name,
695 S_IFREG | S_IRUGO,
696 dlm_root,
697 ls,
698 &format3_fops);
699 if (!ls->ls_debug_all_dentry)
700 goto fail;
701
702 memset(name, 0, sizeof(name));
703 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
704
705 ls->ls_debug_waiters_dentry = debugfs_create_file(name,
706 S_IFREG | S_IRUGO,
707 dlm_root,
708 ls,
709 &waiters_fops);
710 if (!ls->ls_debug_waiters_dentry)
711 goto fail;
712
713 return 0;
714
715 fail:
716 dlm_delete_debug_file(ls);
717 return -ENOMEM;
718 }
719
720 int __init dlm_register_debugfs(void)
721 {
722 mutex_init(&debug_buf_lock);
723 dlm_root = debugfs_create_dir("dlm", NULL);
724 return dlm_root ? 0 : -ENOMEM;
725 }
726
727 void dlm_unregister_debugfs(void)
728 {
729 debugfs_remove(dlm_root);
730 }
731
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree