blob: b969deef9ebbea7cacdc9394516dbc1b50551b45 [file] [log] [blame]
David Teiglande7fd4172006-01-18 09:30:29 +00001/******************************************************************************
2*******************************************************************************
3**
David Teigland892c4462009-01-07 16:48:52 -06004** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved.
David Teiglande7fd4172006-01-18 09:30:29 +00005**
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
David Teiglande7fd4172006-01-18 09:30:29 +000019
20#include "dlm_internal.h"
Josef Bacik916297a2007-05-16 15:56:13 -040021#include "lock.h"
David Teiglande7fd4172006-01-18 09:30:29 +000022
David Teigland5de63192006-07-25 13:44:31 -050023#define DLM_DEBUG_BUF_LEN 4096
24static char debug_buf[DLM_DEBUG_BUF_LEN];
25static struct mutex debug_buf_lock;
David Teiglande7fd4172006-01-18 09:30:29 +000026
27static struct dentry *dlm_root;
28
David Teiglande7fd4172006-01-18 09:30:29 +000029static 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
David Teigland892c4462009-01-07 16:48:52 -060051static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
52 struct dlm_rsb *res)
David Teiglande7fd4172006-01-18 09:30:29 +000053{
54 seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
55
David Teigland892c4462009-01-07 16:48:52 -060056 if (lkb->lkb_status == DLM_LKSTS_CONVERT ||
57 lkb->lkb_status == DLM_LKSTS_WAITING)
David Teiglande7fd4172006-01-18 09:30:29 +000058 seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode));
59
David Teiglande7fd4172006-01-18 09:30:29 +000060 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
David Teigland892c4462009-01-07 16:48:52 -060071 return seq_printf(s, "\n");
David Teiglande7fd4172006-01-18 09:30:29 +000072}
73
David Teiglandd0225092008-12-16 14:53:23 -060074static int print_format1(struct dlm_rsb *res, struct seq_file *s)
David Teiglande7fd4172006-01-18 09:30:29 +000075{
76 struct dlm_lkb *lkb;
David Teigland5de63192006-07-25 13:44:31 -050077 int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
David Teigland892c4462009-01-07 16:48:52 -060078 int rv;
David Teiglande7fd4172006-01-18 09:30:29 +000079
David Teigland9dd592d2007-05-29 08:47:04 -050080 lock_rsb(res);
81
David Teigland892c4462009-01-07 16:48:52 -060082 rv = seq_printf(s, "\nResource %p Name (len=%d) \"",
83 res, res->res_length);
84 if (rv)
85 goto out;
86
David Teiglande7fd4172006-01-18 09:30:29 +000087 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 }
David Teigland892c4462009-01-07 16:48:52 -060093
David Teiglande7fd4172006-01-18 09:30:29 +000094 if (res->res_nodeid > 0)
David Teigland892c4462009-01-07 16:48:52 -060095 rv = seq_printf(s, "\" \nLocal Copy, Master is node %d\n",
96 res->res_nodeid);
David Teiglande7fd4172006-01-18 09:30:29 +000097 else if (res->res_nodeid == 0)
David Teigland892c4462009-01-07 16:48:52 -060098 rv = seq_printf(s, "\" \nMaster Copy\n");
David Teiglande7fd4172006-01-18 09:30:29 +000099 else if (res->res_nodeid == -1)
David Teigland892c4462009-01-07 16:48:52 -0600100 rv = seq_printf(s, "\" \nLooking up master (lkid %x)\n",
101 res->res_first_lkid);
David Teiglande7fd4172006-01-18 09:30:29 +0000102 else
David Teigland892c4462009-01-07 16:48:52 -0600103 rv = seq_printf(s, "\" \nInvalid master %d\n",
104 res->res_nodeid);
105 if (rv)
106 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +0000107
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)");
David Teigland892c4462009-01-07 16:48:52 -0600119 rv = seq_printf(s, "\n");
120 if (rv)
121 goto out;
David Teiglande7fd4172006-01-18 09:30:29 +0000122 }
123
David Teigland5de63192006-07-25 13:44:31 -0500124 root_list = !list_empty(&res->res_root_list);
125 recover_list = !list_empty(&res->res_recover_list);
126
127 if (root_list || recover_list) {
David Teigland892c4462009-01-07 16:48:52 -0600128 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;
David Teigland5de63192006-07-25 13:44:31 -0500133 }
134
David Teiglande7fd4172006-01-18 09:30:29 +0000135 /* Print the locks attached to this resource */
136 seq_printf(s, "Granted Queue\n");
David Teigland892c4462009-01-07 16:48:52 -0600137 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 }
David Teiglande7fd4172006-01-18 09:30:29 +0000142
143 seq_printf(s, "Conversion Queue\n");
David Teigland892c4462009-01-07 16:48:52 -0600144 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 }
David Teiglande7fd4172006-01-18 09:30:29 +0000149
150 seq_printf(s, "Waiting Queue\n");
David Teigland892c4462009-01-07 16:48:52 -0600151 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 }
David Teiglande7fd4172006-01-18 09:30:29 +0000156
David Teigland5de63192006-07-25 13:44:31 -0500157 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) {
David Teigland892c4462009-01-07 16:48:52 -0600162 rv = seq_printf(s, "%08x %s", lkb->lkb_id,
163 print_lockmode(lkb->lkb_rqmode));
David Teigland5de63192006-07-25 13:44:31 -0500164 if (lkb->lkb_wait_type)
165 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
David Teigland892c4462009-01-07 16:48:52 -0600166 rv = seq_printf(s, "\n");
David Teigland5de63192006-07-25 13:44:31 -0500167 }
168 out:
David Teigland9dd592d2007-05-29 08:47:04 -0500169 unlock_rsb(res);
David Teigland892c4462009-01-07 16:48:52 -0600170 return rv;
David Teigland9dd592d2007-05-29 08:47:04 -0500171}
172
David Teigland892c4462009-01-07 16:48:52 -0600173static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
174 struct dlm_rsb *r)
David Teigland9dd592d2007-05-29 08:47:04 -0500175{
David Teiglandeeda4182008-12-09 14:12:21 -0600176 u64 xid = 0;
177 u64 us;
David Teigland892c4462009-01-07 16:48:52 -0600178 int rv;
David Teigland9dd592d2007-05-29 08:47:04 -0500179
180 if (lkb->lkb_flags & DLM_IFL_USER) {
David Teiglandd292c0c2008-02-06 23:27:04 -0600181 if (lkb->lkb_ua)
182 xid = lkb->lkb_ua->xid;
David Teigland9dd592d2007-05-29 08:47:04 -0500183 }
184
David Teiglandeeda4182008-12-09 14:12:21 -0600185 /* microseconds since lkb was added to current queue */
186 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp));
David Teigland9dd592d2007-05-29 08:47:04 -0500187
David Teiglandeeda4182008-12-09 14:12:21 -0600188 /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
David Teiglandac90a252007-07-06 09:47:08 -0500189 r_nodeid r_len r_name */
David Teigland9dd592d2007-05-29 08:47:04 -0500190
David Teigland892c4462009-01-07 16:48:52 -0600191 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;
David Teigland9dd592d2007-05-29 08:47:04 -0500207}
208
David Teiglandd0225092008-12-16 14:53:23 -0600209static int print_format2(struct dlm_rsb *r, struct seq_file *s)
David Teigland9dd592d2007-05-29 08:47:04 -0500210{
211 struct dlm_lkb *lkb;
David Teigland892c4462009-01-07 16:48:52 -0600212 int rv = 0;
David Teigland9dd592d2007-05-29 08:47:04 -0500213
214 lock_rsb(r);
215
David Teigland892c4462009-01-07 16:48:52 -0600216 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 }
David Teigland9dd592d2007-05-29 08:47:04 -0500221
David Teigland892c4462009-01-07 16:48:52 -0600222 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 }
David Teigland9dd592d2007-05-29 08:47:04 -0500227
David Teigland892c4462009-01-07 16:48:52 -0600228 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:
David Teiglandd0225092008-12-16 14:53:23 -0600234 unlock_rsb(r);
David Teigland892c4462009-01-07 16:48:52 -0600235 return rv;
David Teiglandd0225092008-12-16 14:53:23 -0600236}
237
David Teigland892c4462009-01-07 16:48:52 -0600238static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
239 int rsb_lookup)
David Teiglandd0225092008-12-16 14:53:23 -0600240{
241 u64 xid = 0;
David Teigland892c4462009-01-07 16:48:52 -0600242 int rv;
David Teiglandd0225092008-12-16 14:53:23 -0600243
244 if (lkb->lkb_flags & DLM_IFL_USER) {
245 if (lkb->lkb_ua)
246 xid = lkb->lkb_ua->xid;
247 }
248
David Teigland892c4462009-01-07 16:48:52 -0600249 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,
David Teigland8304d6f2011-02-21 14:58:21 -0600260 lkb->lkb_last_bast.mode,
David Teigland892c4462009-01-07 16:48:52 -0600261 rsb_lookup,
262 lkb->lkb_wait_type,
263 lkb->lkb_lvbseq,
264 (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
David Teigland8304d6f2011-02-21 14:58:21 -0600265 (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
David Teigland892c4462009-01-07 16:48:52 -0600266 return rv;
David Teiglandd0225092008-12-16 14:53:23 -0600267}
268
269static 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;
David Teigland892c4462009-01-07 16:48:52 -0600274 int rv;
David Teiglandd0225092008-12-16 14:53:23 -0600275
276 lock_rsb(r);
277
David Teigland892c4462009-01-07 16:48:52 -0600278 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;
David Teiglandd0225092008-12-16 14:53:23 -0600289
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 }
David Teigland892c4462009-01-07 16:48:52 -0600303 rv = seq_printf(s, "\n");
304 if (rv)
305 goto out;
David Teiglandd0225092008-12-16 14:53:23 -0600306
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]);
David Teigland892c4462009-01-07 16:48:52 -0600314 rv = seq_printf(s, "\n");
315 if (rv)
316 goto out;
David Teiglandd0225092008-12-16 14:53:23 -0600317
318 do_locks:
David Teigland892c4462009-01-07 16:48:52 -0600319 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 }
David Teiglandd0225092008-12-16 14:53:23 -0600324
David Teigland892c4462009-01-07 16:48:52 -0600325 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 }
David Teiglandd0225092008-12-16 14:53:23 -0600330
David Teigland892c4462009-01-07 16:48:52 -0600331 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 }
David Teiglandd0225092008-12-16 14:53:23 -0600336
David Teigland892c4462009-01-07 16:48:52 -0600337 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:
David Teigland9dd592d2007-05-29 08:47:04 -0500343 unlock_rsb(r);
David Teigland892c4462009-01-07 16:48:52 -0600344 return rv;
David Teiglande7fd4172006-01-18 09:30:29 +0000345}
346
David Teiglandc04fecb2012-05-10 10:18:07 -0500347static int print_format4(struct dlm_rsb *r, struct seq_file *s)
348{
349 int our_nodeid = dlm_our_nodeid();
350 int print_name = 1;
351 int i, rv;
352
353 lock_rsb(r);
354
355 rv = seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
356 r,
357 r->res_nodeid,
358 r->res_master_nodeid,
359 r->res_dir_nodeid,
360 our_nodeid,
361 r->res_toss_time,
362 r->res_flags,
363 r->res_length);
364 if (rv)
365 goto out;
366
367 for (i = 0; i < r->res_length; i++) {
368 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
369 print_name = 0;
370 }
371
372 seq_printf(s, "%s", print_name ? "str " : "hex");
373
374 for (i = 0; i < r->res_length; i++) {
375 if (print_name)
376 seq_printf(s, "%c", r->res_name[i]);
377 else
378 seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
379 }
380 rv = seq_printf(s, "\n");
381 out:
382 unlock_rsb(r);
383 return rv;
384}
385
David Teigland892c4462009-01-07 16:48:52 -0600386struct rsbtbl_iter {
387 struct dlm_rsb *rsb;
388 unsigned bucket;
389 int format;
390 int header;
391};
392
393/* seq_printf returns -1 if the buffer is full, and 0 otherwise.
394 If the buffer is full, seq_printf can be called again, but it
395 does nothing and just returns -1. So, the these printing routines
396 periodically check the return value to avoid wasting too much time
397 trying to print to a full buffer. */
398
399static int table_seq_show(struct seq_file *seq, void *iter_ptr)
David Teiglande7fd4172006-01-18 09:30:29 +0000400{
David Teigland892c4462009-01-07 16:48:52 -0600401 struct rsbtbl_iter *ri = iter_ptr;
402 int rv = 0;
David Teiglande7fd4172006-01-18 09:30:29 +0000403
David Teiglandd0225092008-12-16 14:53:23 -0600404 switch (ri->format) {
405 case 1:
David Teigland892c4462009-01-07 16:48:52 -0600406 rv = print_format1(ri->rsb, seq);
David Teiglandd0225092008-12-16 14:53:23 -0600407 break;
408 case 2:
David Teigland9dd592d2007-05-29 08:47:04 -0500409 if (ri->header) {
David Teigland892c4462009-01-07 16:48:52 -0600410 seq_printf(seq, "id nodeid remid pid xid exflags "
411 "flags sts grmode rqmode time_ms "
412 "r_nodeid r_len r_name\n");
David Teigland9dd592d2007-05-29 08:47:04 -0500413 ri->header = 0;
414 }
David Teigland892c4462009-01-07 16:48:52 -0600415 rv = print_format2(ri->rsb, seq);
David Teiglandd0225092008-12-16 14:53:23 -0600416 break;
417 case 3:
418 if (ri->header) {
David Teigland892c4462009-01-07 16:48:52 -0600419 seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
David Teiglandd0225092008-12-16 14:53:23 -0600420 ri->header = 0;
421 }
David Teigland892c4462009-01-07 16:48:52 -0600422 rv = print_format3(ri->rsb, seq);
David Teiglandd0225092008-12-16 14:53:23 -0600423 break;
David Teiglandc04fecb2012-05-10 10:18:07 -0500424 case 4:
425 if (ri->header) {
426 seq_printf(seq, "version 4 rsb 2\n");
427 ri->header = 0;
428 }
429 rv = print_format4(ri->rsb, seq);
430 break;
David Teigland9dd592d2007-05-29 08:47:04 -0500431 }
David Teiglande7fd4172006-01-18 09:30:29 +0000432
David Teigland892c4462009-01-07 16:48:52 -0600433 return rv;
David Teiglande7fd4172006-01-18 09:30:29 +0000434}
435
James Morris88e9d342009-09-22 16:43:43 -0700436static const struct seq_operations format1_seq_ops;
437static const struct seq_operations format2_seq_ops;
438static const struct seq_operations format3_seq_ops;
David Teiglandc04fecb2012-05-10 10:18:07 -0500439static const struct seq_operations format4_seq_ops;
David Teigland892c4462009-01-07 16:48:52 -0600440
441static void *table_seq_start(struct seq_file *seq, loff_t *pos)
442{
David Teiglandc04fecb2012-05-10 10:18:07 -0500443 struct rb_root *tree;
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500444 struct rb_node *node;
David Teigland892c4462009-01-07 16:48:52 -0600445 struct dlm_ls *ls = seq->private;
446 struct rsbtbl_iter *ri;
447 struct dlm_rsb *r;
448 loff_t n = *pos;
449 unsigned bucket, entry;
David Teiglandc04fecb2012-05-10 10:18:07 -0500450 int toss = (seq->op == &format4_seq_ops);
David Teigland892c4462009-01-07 16:48:52 -0600451
452 bucket = n >> 32;
453 entry = n & ((1LL << 32) - 1);
454
455 if (bucket >= ls->ls_rsbtbl_size)
456 return NULL;
457
David Teigland573c24c2009-11-30 16:34:43 -0600458 ri = kzalloc(sizeof(struct rsbtbl_iter), GFP_NOFS);
David Teigland892c4462009-01-07 16:48:52 -0600459 if (!ri)
460 return NULL;
461 if (n == 0)
462 ri->header = 1;
463 if (seq->op == &format1_seq_ops)
464 ri->format = 1;
465 if (seq->op == &format2_seq_ops)
466 ri->format = 2;
467 if (seq->op == &format3_seq_ops)
468 ri->format = 3;
David Teiglandc04fecb2012-05-10 10:18:07 -0500469 if (seq->op == &format4_seq_ops)
470 ri->format = 4;
471
472 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
David Teigland892c4462009-01-07 16:48:52 -0600473
David Teiglandc7be7612009-01-07 16:50:41 -0600474 spin_lock(&ls->ls_rsbtbl[bucket].lock);
David Teiglandc04fecb2012-05-10 10:18:07 -0500475 if (!RB_EMPTY_ROOT(tree)) {
476 for (node = rb_first(tree); node; node = rb_next(node)) {
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500477 r = rb_entry(node, struct dlm_rsb, res_hashnode);
David Teigland892c4462009-01-07 16:48:52 -0600478 if (!entry--) {
479 dlm_hold_rsb(r);
480 ri->rsb = r;
481 ri->bucket = bucket;
David Teiglandc7be7612009-01-07 16:50:41 -0600482 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600483 return ri;
484 }
485 }
486 }
David Teiglandc7be7612009-01-07 16:50:41 -0600487 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600488
489 /*
490 * move to the first rsb in the next non-empty bucket
491 */
492
493 /* zero the entry */
494 n &= ~((1LL << 32) - 1);
495
496 while (1) {
497 bucket++;
498 n += 1LL << 32;
499
500 if (bucket >= ls->ls_rsbtbl_size) {
501 kfree(ri);
502 return NULL;
503 }
David Teiglandc04fecb2012-05-10 10:18:07 -0500504 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
David Teigland892c4462009-01-07 16:48:52 -0600505
David Teiglandc7be7612009-01-07 16:50:41 -0600506 spin_lock(&ls->ls_rsbtbl[bucket].lock);
David Teiglandc04fecb2012-05-10 10:18:07 -0500507 if (!RB_EMPTY_ROOT(tree)) {
508 node = rb_first(tree);
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500509 r = rb_entry(node, struct dlm_rsb, res_hashnode);
David Teigland892c4462009-01-07 16:48:52 -0600510 dlm_hold_rsb(r);
511 ri->rsb = r;
512 ri->bucket = bucket;
David Teiglandc7be7612009-01-07 16:50:41 -0600513 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600514 *pos = n;
515 return ri;
516 }
David Teiglandc7be7612009-01-07 16:50:41 -0600517 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600518 }
519}
520
521static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
522{
523 struct dlm_ls *ls = seq->private;
524 struct rsbtbl_iter *ri = iter_ptr;
David Teiglandc04fecb2012-05-10 10:18:07 -0500525 struct rb_root *tree;
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500526 struct rb_node *next;
David Teigland892c4462009-01-07 16:48:52 -0600527 struct dlm_rsb *r, *rp;
528 loff_t n = *pos;
529 unsigned bucket;
David Teiglandc04fecb2012-05-10 10:18:07 -0500530 int toss = (seq->op == &format4_seq_ops);
David Teigland892c4462009-01-07 16:48:52 -0600531
532 bucket = n >> 32;
533
534 /*
535 * move to the next rsb in the same bucket
536 */
537
David Teiglandc7be7612009-01-07 16:50:41 -0600538 spin_lock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600539 rp = ri->rsb;
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500540 next = rb_next(&rp->res_hashnode);
David Teigland892c4462009-01-07 16:48:52 -0600541
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500542 if (next) {
543 r = rb_entry(next, struct dlm_rsb, res_hashnode);
David Teigland892c4462009-01-07 16:48:52 -0600544 dlm_hold_rsb(r);
545 ri->rsb = r;
David Teiglandc7be7612009-01-07 16:50:41 -0600546 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600547 dlm_put_rsb(rp);
548 ++*pos;
549 return ri;
550 }
David Teiglandc7be7612009-01-07 16:50:41 -0600551 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600552 dlm_put_rsb(rp);
553
554 /*
555 * move to the first rsb in the next non-empty bucket
556 */
557
558 /* zero the entry */
559 n &= ~((1LL << 32) - 1);
560
561 while (1) {
562 bucket++;
563 n += 1LL << 32;
564
565 if (bucket >= ls->ls_rsbtbl_size) {
566 kfree(ri);
567 return NULL;
568 }
David Teiglandc04fecb2012-05-10 10:18:07 -0500569 tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep;
David Teigland892c4462009-01-07 16:48:52 -0600570
David Teiglandc7be7612009-01-07 16:50:41 -0600571 spin_lock(&ls->ls_rsbtbl[bucket].lock);
David Teiglandc04fecb2012-05-10 10:18:07 -0500572 if (!RB_EMPTY_ROOT(tree)) {
573 next = rb_first(tree);
Bob Peterson9beb3bf2011-10-26 15:24:55 -0500574 r = rb_entry(next, struct dlm_rsb, res_hashnode);
David Teigland892c4462009-01-07 16:48:52 -0600575 dlm_hold_rsb(r);
576 ri->rsb = r;
577 ri->bucket = bucket;
David Teiglandc7be7612009-01-07 16:50:41 -0600578 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600579 *pos = n;
580 return ri;
581 }
David Teiglandc7be7612009-01-07 16:50:41 -0600582 spin_unlock(&ls->ls_rsbtbl[bucket].lock);
David Teigland892c4462009-01-07 16:48:52 -0600583 }
584}
585
586static void table_seq_stop(struct seq_file *seq, void *iter_ptr)
587{
588 struct rsbtbl_iter *ri = iter_ptr;
589
590 if (ri) {
591 dlm_put_rsb(ri->rsb);
592 kfree(ri);
593 }
594}
595
James Morris88e9d342009-09-22 16:43:43 -0700596static const struct seq_operations format1_seq_ops = {
David Teigland892c4462009-01-07 16:48:52 -0600597 .start = table_seq_start,
598 .next = table_seq_next,
599 .stop = table_seq_stop,
600 .show = table_seq_show,
David Teiglande7fd4172006-01-18 09:30:29 +0000601};
602
James Morris88e9d342009-09-22 16:43:43 -0700603static const struct seq_operations format2_seq_ops = {
David Teigland892c4462009-01-07 16:48:52 -0600604 .start = table_seq_start,
605 .next = table_seq_next,
606 .stop = table_seq_stop,
607 .show = table_seq_show,
608};
609
James Morris88e9d342009-09-22 16:43:43 -0700610static const struct seq_operations format3_seq_ops = {
David Teigland892c4462009-01-07 16:48:52 -0600611 .start = table_seq_start,
612 .next = table_seq_next,
613 .stop = table_seq_stop,
614 .show = table_seq_show,
615};
616
David Teiglandc04fecb2012-05-10 10:18:07 -0500617static const struct seq_operations format4_seq_ops = {
618 .start = table_seq_start,
619 .next = table_seq_next,
620 .stop = table_seq_stop,
621 .show = table_seq_show,
622};
623
David Teigland892c4462009-01-07 16:48:52 -0600624static const struct file_operations format1_fops;
625static const struct file_operations format2_fops;
626static const struct file_operations format3_fops;
David Teiglandc04fecb2012-05-10 10:18:07 -0500627static const struct file_operations format4_fops;
David Teigland892c4462009-01-07 16:48:52 -0600628
629static int table_open(struct inode *inode, struct file *file)
David Teiglande7fd4172006-01-18 09:30:29 +0000630{
631 struct seq_file *seq;
David Teigland892c4462009-01-07 16:48:52 -0600632 int ret = -1;
David Teiglande7fd4172006-01-18 09:30:29 +0000633
David Teigland892c4462009-01-07 16:48:52 -0600634 if (file->f_op == &format1_fops)
635 ret = seq_open(file, &format1_seq_ops);
636 else if (file->f_op == &format2_fops)
637 ret = seq_open(file, &format2_seq_ops);
638 else if (file->f_op == &format3_fops)
639 ret = seq_open(file, &format3_seq_ops);
David Teiglandc04fecb2012-05-10 10:18:07 -0500640 else if (file->f_op == &format4_fops)
641 ret = seq_open(file, &format4_seq_ops);
David Teigland892c4462009-01-07 16:48:52 -0600642
David Teiglande7fd4172006-01-18 09:30:29 +0000643 if (ret)
644 return ret;
645
646 seq = file->private_data;
David Teigland892c4462009-01-07 16:48:52 -0600647 seq->private = inode->i_private; /* the dlm_ls */
David Teiglande7fd4172006-01-18 09:30:29 +0000648 return 0;
649}
650
David Teigland892c4462009-01-07 16:48:52 -0600651static const struct file_operations format1_fops = {
David Teiglande7fd4172006-01-18 09:30:29 +0000652 .owner = THIS_MODULE,
David Teigland892c4462009-01-07 16:48:52 -0600653 .open = table_open,
David Teiglande7fd4172006-01-18 09:30:29 +0000654 .read = seq_read,
655 .llseek = seq_lseek,
656 .release = seq_release
657};
658
David Teigland892c4462009-01-07 16:48:52 -0600659static const struct file_operations format2_fops = {
David Teigland9dd592d2007-05-29 08:47:04 -0500660 .owner = THIS_MODULE,
David Teigland892c4462009-01-07 16:48:52 -0600661 .open = table_open,
David Teigland9dd592d2007-05-29 08:47:04 -0500662 .read = seq_read,
663 .llseek = seq_lseek,
664 .release = seq_release
665};
666
David Teigland892c4462009-01-07 16:48:52 -0600667static const struct file_operations format3_fops = {
David Teiglandd0225092008-12-16 14:53:23 -0600668 .owner = THIS_MODULE,
David Teigland892c4462009-01-07 16:48:52 -0600669 .open = table_open,
David Teiglandd0225092008-12-16 14:53:23 -0600670 .read = seq_read,
671 .llseek = seq_lseek,
672 .release = seq_release
673};
674
David Teiglandc04fecb2012-05-10 10:18:07 -0500675static const struct file_operations format4_fops = {
676 .owner = THIS_MODULE,
677 .open = table_open,
678 .read = seq_read,
679 .llseek = seq_lseek,
680 .release = seq_release
681};
682
David Teiglandd0225092008-12-16 14:53:23 -0600683/*
David Teigland5de63192006-07-25 13:44:31 -0500684 * dump lkb's on the ls_waiters list
685 */
David Teigland5de63192006-07-25 13:44:31 -0500686static ssize_t waiters_read(struct file *file, char __user *userbuf,
687 size_t count, loff_t *ppos)
688{
689 struct dlm_ls *ls = file->private_data;
690 struct dlm_lkb *lkb;
David Teigland06442442006-08-08 11:31:30 -0500691 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv;
David Teigland5de63192006-07-25 13:44:31 -0500692
693 mutex_lock(&debug_buf_lock);
694 mutex_lock(&ls->ls_waiters_mutex);
695 memset(debug_buf, 0, sizeof(debug_buf));
696
697 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
David Teigland06442442006-08-08 11:31:30 -0500698 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n",
699 lkb->lkb_id, lkb->lkb_wait_type,
700 lkb->lkb_nodeid, lkb->lkb_resource->res_name);
701 if (ret >= len - pos)
702 break;
703 pos += ret;
David Teigland5de63192006-07-25 13:44:31 -0500704 }
705 mutex_unlock(&ls->ls_waiters_mutex);
706
707 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos);
708 mutex_unlock(&debug_buf_lock);
709 return rv;
710}
711
Arjan van de Ven00977a52007-02-12 00:55:34 -0800712static const struct file_operations waiters_fops = {
David Teigland5de63192006-07-25 13:44:31 -0500713 .owner = THIS_MODULE,
Stephen Boyd234e3402012-04-05 14:25:11 -0700714 .open = simple_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200715 .read = waiters_read,
716 .llseek = default_llseek,
David Teigland5de63192006-07-25 13:44:31 -0500717};
718
David Teiglandd0225092008-12-16 14:53:23 -0600719void dlm_delete_debug_file(struct dlm_ls *ls)
720{
721 if (ls->ls_debug_rsb_dentry)
722 debugfs_remove(ls->ls_debug_rsb_dentry);
723 if (ls->ls_debug_waiters_dentry)
724 debugfs_remove(ls->ls_debug_waiters_dentry);
725 if (ls->ls_debug_locks_dentry)
726 debugfs_remove(ls->ls_debug_locks_dentry);
727 if (ls->ls_debug_all_dentry)
728 debugfs_remove(ls->ls_debug_all_dentry);
David Teiglandc04fecb2012-05-10 10:18:07 -0500729 if (ls->ls_debug_toss_dentry)
730 debugfs_remove(ls->ls_debug_toss_dentry);
David Teiglandd0225092008-12-16 14:53:23 -0600731}
732
David Teiglande7fd4172006-01-18 09:30:29 +0000733int dlm_create_debug_file(struct dlm_ls *ls)
734{
David Teigland5de63192006-07-25 13:44:31 -0500735 char name[DLM_LOCKSPACE_LEN+8];
736
David Teiglandd0225092008-12-16 14:53:23 -0600737 /* format 1 */
738
David Teigland5de63192006-07-25 13:44:31 -0500739 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name,
740 S_IFREG | S_IRUGO,
741 dlm_root,
742 ls,
David Teigland892c4462009-01-07 16:48:52 -0600743 &format1_fops);
David Teigland20abf972006-07-26 08:29:06 -0500744 if (!ls->ls_debug_rsb_dentry)
David Teiglandd0225092008-12-16 14:53:23 -0600745 goto fail;
David Teigland5de63192006-07-25 13:44:31 -0500746
David Teiglandd0225092008-12-16 14:53:23 -0600747 /* format 2 */
David Teigland5de63192006-07-25 13:44:31 -0500748
David Teigland9dd592d2007-05-29 08:47:04 -0500749 memset(name, 0, sizeof(name));
David Teiglandac90a252007-07-06 09:47:08 -0500750 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_locks", ls->ls_name);
David Teigland9dd592d2007-05-29 08:47:04 -0500751
David Teiglandac90a252007-07-06 09:47:08 -0500752 ls->ls_debug_locks_dentry = debugfs_create_file(name,
753 S_IFREG | S_IRUGO,
754 dlm_root,
755 ls,
David Teigland892c4462009-01-07 16:48:52 -0600756 &format2_fops);
David Teiglandd0225092008-12-16 14:53:23 -0600757 if (!ls->ls_debug_locks_dentry)
758 goto fail;
759
760 /* format 3 */
761
762 memset(name, 0, sizeof(name));
763 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_all", ls->ls_name);
764
765 ls->ls_debug_all_dentry = debugfs_create_file(name,
766 S_IFREG | S_IRUGO,
767 dlm_root,
768 ls,
David Teigland892c4462009-01-07 16:48:52 -0600769 &format3_fops);
David Teiglandd0225092008-12-16 14:53:23 -0600770 if (!ls->ls_debug_all_dentry)
771 goto fail;
772
David Teiglandc04fecb2012-05-10 10:18:07 -0500773 /* format 4 */
774
775 memset(name, 0, sizeof(name));
776 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_toss", ls->ls_name);
777
778 ls->ls_debug_toss_dentry = debugfs_create_file(name,
779 S_IFREG | S_IRUGO,
780 dlm_root,
781 ls,
782 &format4_fops);
783 if (!ls->ls_debug_toss_dentry)
784 goto fail;
785
David Teiglandd0225092008-12-16 14:53:23 -0600786 memset(name, 0, sizeof(name));
787 snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name);
788
789 ls->ls_debug_waiters_dentry = debugfs_create_file(name,
790 S_IFREG | S_IRUGO,
791 dlm_root,
792 ls,
793 &waiters_fops);
794 if (!ls->ls_debug_waiters_dentry)
795 goto fail;
David Teigland9dd592d2007-05-29 08:47:04 -0500796
David Teigland5de63192006-07-25 13:44:31 -0500797 return 0;
David Teiglande7fd4172006-01-18 09:30:29 +0000798
David Teiglandd0225092008-12-16 14:53:23 -0600799 fail:
800 dlm_delete_debug_file(ls);
801 return -ENOMEM;
David Teiglande7fd4172006-01-18 09:30:29 +0000802}
803
Denis Cheng30727172008-02-02 01:53:46 +0800804int __init dlm_register_debugfs(void)
David Teiglande7fd4172006-01-18 09:30:29 +0000805{
David Teigland5de63192006-07-25 13:44:31 -0500806 mutex_init(&debug_buf_lock);
David Teiglande7fd4172006-01-18 09:30:29 +0000807 dlm_root = debugfs_create_dir("dlm", NULL);
808 return dlm_root ? 0 : -ENOMEM;
809}
810
811void dlm_unregister_debugfs(void)
812{
813 debugfs_remove(dlm_root);
814}
815