1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 ******************************************************************************* 4 ** 5 ** Copyright (C) 2005-2009 Red Hat, Inc. All rights reserved. 6 ** 7 ** 8 ******************************************************************************* 9 ******************************************************************************/ 10 11 #include <linux/pagemap.h> 12 #include <linux/seq_file.h> 13 #include <linux/init.h> 14 #include <linux/ctype.h> 15 #include <linux/debugfs.h> 16 #include <linux/slab.h> 17 18 #include "dlm_internal.h" 19 #include "midcomms.h" 20 #include "lock.h" 21 #include "ast.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 static struct dentry *dlm_comms; 29 30 static char *print_lockmode(int mode) 31 { 32 switch (mode) { 33 case DLM_LOCK_IV: 34 return "--"; 35 case DLM_LOCK_NL: 36 return "NL"; 37 case DLM_LOCK_CR: 38 return "CR"; 39 case DLM_LOCK_CW: 40 return "CW"; 41 case DLM_LOCK_PR: 42 return "PR"; 43 case DLM_LOCK_PW: 44 return "PW"; 45 case DLM_LOCK_EX: 46 return "EX"; 47 default: 48 return "??"; 49 } 50 } 51 52 static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb, 53 struct dlm_rsb *res) 54 { 55 seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode)); 56 57 if (lkb->lkb_status == DLM_LKSTS_CONVERT || 58 lkb->lkb_status == DLM_LKSTS_WAITING) 59 seq_printf(s, " (%s)", print_lockmode(lkb->lkb_rqmode)); 60 61 if (lkb->lkb_nodeid) { 62 if (lkb->lkb_nodeid != res->res_nodeid) 63 seq_printf(s, " Remote: %3d %08x", lkb->lkb_nodeid, 64 lkb->lkb_remid); 65 else 66 seq_printf(s, " Master: %08x", lkb->lkb_remid); 67 } 68 69 if (lkb->lkb_wait_type) 70 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type); 71 72 seq_putc(s, '\n'); 73 } 74 75 static void print_format1(struct dlm_rsb *res, struct seq_file *s) 76 { 77 struct dlm_lkb *lkb; 78 int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list; 79 80 lock_rsb(res); 81 82 seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length); 83 84 for (i = 0; i < res->res_length; i++) { 85 if (isprint(res->res_name[i])) 86 seq_printf(s, "%c", res->res_name[i]); 87 else 88 seq_printf(s, "%c", '.'); 89 } 90 91 if (res->res_nodeid > 0) 92 seq_printf(s, "\"\nLocal Copy, Master is node %d\n", 93 res->res_nodeid); 94 else if (res->res_nodeid == 0) 95 seq_puts(s, "\"\nMaster Copy\n"); 96 else if (res->res_nodeid == -1) 97 seq_printf(s, "\"\nLooking up master (lkid %x)\n", 98 res->res_first_lkid); 99 else 100 seq_printf(s, "\"\nInvalid master %d\n", res->res_nodeid); 101 if (seq_has_overflowed(s)) 102 goto out; 103 104 /* Print the LVB: */ 105 if (res->res_lvbptr) { 106 seq_puts(s, "LVB: "); 107 for (i = 0; i < lvblen; i++) { 108 if (i == lvblen / 2) 109 seq_puts(s, "\n "); 110 seq_printf(s, "%02x ", 111 (unsigned char) res->res_lvbptr[i]); 112 } 113 if (rsb_flag(res, RSB_VALNOTVALID)) 114 seq_puts(s, " (INVALID)"); 115 seq_putc(s, '\n'); 116 if (seq_has_overflowed(s)) 117 goto out; 118 } 119 120 root_list = !list_empty(&res->res_root_list); 121 recover_list = !list_empty(&res->res_recover_list); 122 123 if (root_list || recover_list) { 124 seq_printf(s, "Recovery: root %d recover %d flags %lx count %d\n", 125 root_list, recover_list, 126 res->res_flags, res->res_recover_locks_count); 127 } 128 129 /* Print the locks attached to this resource */ 130 seq_puts(s, "Granted Queue\n"); 131 list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) { 132 print_format1_lock(s, lkb, res); 133 if (seq_has_overflowed(s)) 134 goto out; 135 } 136 137 seq_puts(s, "Conversion Queue\n"); 138 list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) { 139 print_format1_lock(s, lkb, res); 140 if (seq_has_overflowed(s)) 141 goto out; 142 } 143 144 seq_puts(s, "Waiting Queue\n"); 145 list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) { 146 print_format1_lock(s, lkb, res); 147 if (seq_has_overflowed(s)) 148 goto out; 149 } 150 151 if (list_empty(&res->res_lookup)) 152 goto out; 153 154 seq_puts(s, "Lookup Queue\n"); 155 list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) { 156 seq_printf(s, "%08x %s", 157 lkb->lkb_id, print_lockmode(lkb->lkb_rqmode)); 158 if (lkb->lkb_wait_type) 159 seq_printf(s, " wait_type: %d", lkb->lkb_wait_type); 160 seq_putc(s, '\n'); 161 if (seq_has_overflowed(s)) 162 goto out; 163 } 164 out: 165 unlock_rsb(res); 166 } 167 168 static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb, 169 struct dlm_rsb *r) 170 { 171 u64 xid = 0; 172 u64 us; 173 174 if (test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) { 175 if (lkb->lkb_ua) 176 xid = lkb->lkb_ua->xid; 177 } 178 179 /* microseconds since lkb was added to current queue */ 180 us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_timestamp)); 181 182 /* id nodeid remid pid xid exflags flags sts grmode rqmode time_us 183 r_nodeid r_len r_name */ 184 185 seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n", 186 lkb->lkb_id, 187 lkb->lkb_nodeid, 188 lkb->lkb_remid, 189 lkb->lkb_ownpid, 190 (unsigned long long)xid, 191 lkb->lkb_exflags, 192 dlm_iflags_val(lkb), 193 lkb->lkb_status, 194 lkb->lkb_grmode, 195 lkb->lkb_rqmode, 196 (unsigned long long)us, 197 r->res_nodeid, 198 r->res_length, 199 r->res_name); 200 } 201 202 static void print_format2(struct dlm_rsb *r, struct seq_file *s) 203 { 204 struct dlm_lkb *lkb; 205 206 lock_rsb(r); 207 208 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) { 209 print_format2_lock(s, lkb, r); 210 if (seq_has_overflowed(s)) 211 goto out; 212 } 213 214 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) { 215 print_format2_lock(s, lkb, r); 216 if (seq_has_overflowed(s)) 217 goto out; 218 } 219 220 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) { 221 print_format2_lock(s, lkb, r); 222 if (seq_has_overflowed(s)) 223 goto out; 224 } 225 out: 226 unlock_rsb(r); 227 } 228 229 static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb, 230 int rsb_lookup) 231 { 232 u64 xid = 0; 233 234 if (test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) { 235 if (lkb->lkb_ua) 236 xid = lkb->lkb_ua->xid; 237 } 238 239 seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n", 240 lkb->lkb_id, 241 lkb->lkb_nodeid, 242 lkb->lkb_remid, 243 lkb->lkb_ownpid, 244 (unsigned long long)xid, 245 lkb->lkb_exflags, 246 dlm_iflags_val(lkb), 247 lkb->lkb_status, 248 lkb->lkb_grmode, 249 lkb->lkb_rqmode, 250 lkb->lkb_last_bast_cb_mode, 251 rsb_lookup, 252 lkb->lkb_wait_type, 253 lkb->lkb_lvbseq, 254 (unsigned long long)ktime_to_ns(lkb->lkb_timestamp), 255 (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time)); 256 } 257 258 static void print_format3(struct dlm_rsb *r, struct seq_file *s) 259 { 260 struct dlm_lkb *lkb; 261 int i, lvblen = r->res_ls->ls_lvblen; 262 int print_name = 1; 263 264 lock_rsb(r); 265 266 seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ", 267 r, 268 r->res_nodeid, 269 r->res_first_lkid, 270 r->res_flags, 271 !list_empty(&r->res_root_list), 272 !list_empty(&r->res_recover_list), 273 r->res_recover_locks_count, 274 r->res_length); 275 if (seq_has_overflowed(s)) 276 goto out; 277 278 for (i = 0; i < r->res_length; i++) { 279 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i])) 280 print_name = 0; 281 } 282 283 seq_puts(s, print_name ? "str " : "hex"); 284 285 for (i = 0; i < r->res_length; i++) { 286 if (print_name) 287 seq_printf(s, "%c", r->res_name[i]); 288 else 289 seq_printf(s, " %02x", (unsigned char)r->res_name[i]); 290 } 291 seq_putc(s, '\n'); 292 if (seq_has_overflowed(s)) 293 goto out; 294 295 if (!r->res_lvbptr) 296 goto do_locks; 297 298 seq_printf(s, "lvb %u %d", r->res_lvbseq, lvblen); 299 300 for (i = 0; i < lvblen; i++) 301 seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]); 302 seq_putc(s, '\n'); 303 if (seq_has_overflowed(s)) 304 goto out; 305 306 do_locks: 307 list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) { 308 print_format3_lock(s, lkb, 0); 309 if (seq_has_overflowed(s)) 310 goto out; 311 } 312 313 list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) { 314 print_format3_lock(s, lkb, 0); 315 if (seq_has_overflowed(s)) 316 goto out; 317 } 318 319 list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) { 320 print_format3_lock(s, lkb, 0); 321 if (seq_has_overflowed(s)) 322 goto out; 323 } 324 325 list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) { 326 print_format3_lock(s, lkb, 1); 327 if (seq_has_overflowed(s)) 328 goto out; 329 } 330 out: 331 unlock_rsb(r); 332 } 333 334 static void print_format4(struct dlm_rsb *r, struct seq_file *s) 335 { 336 int our_nodeid = dlm_our_nodeid(); 337 int print_name = 1; 338 int i; 339 340 lock_rsb(r); 341 342 seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ", 343 r, 344 r->res_nodeid, 345 r->res_master_nodeid, 346 r->res_dir_nodeid, 347 our_nodeid, 348 r->res_toss_time, 349 r->res_flags, 350 r->res_length); 351 352 for (i = 0; i < r->res_length; i++) { 353 if (!isascii(r->res_name[i]) || !isprint(r->res_name[i])) 354 print_name = 0; 355 } 356 357 seq_puts(s, print_name ? "str " : "hex"); 358 359 for (i = 0; i < r->res_length; i++) { 360 if (print_name) 361 seq_printf(s, "%c", r->res_name[i]); 362 else 363 seq_printf(s, " %02x", (unsigned char)r->res_name[i]); 364 } 365 seq_putc(s, '\n'); 366 unlock_rsb(r); 367 } 368 369 static const struct seq_operations format1_seq_ops; 370 static const struct seq_operations format2_seq_ops; 371 static const struct seq_operations format3_seq_ops; 372 static const struct seq_operations format4_seq_ops; 373 374 /* 375 * If the buffer is full, seq_printf can be called again, but it 376 * does nothing. So, the these printing routines periodically check 377 * seq_has_overflowed to avoid wasting too much time trying to print to 378 * a full buffer. 379 */ 380 381 static int table_seq_show(struct seq_file *seq, void *iter_ptr) 382 { 383 struct dlm_rsb *rsb = list_entry(iter_ptr, struct dlm_rsb, res_rsbs_list); 384 385 if (seq->op == &format1_seq_ops) 386 print_format1(rsb, seq); 387 else if (seq->op == &format2_seq_ops) 388 print_format2(rsb, seq); 389 else if (seq->op == &format3_seq_ops) 390 print_format3(rsb, seq); 391 else if (seq->op == &format4_seq_ops) 392 print_format4(rsb, seq); 393 394 return 0; 395 } 396 397 static void *table_seq_start(struct seq_file *seq, loff_t *pos) 398 { 399 struct dlm_ls *ls = seq->private; 400 struct list_head *list; 401 402 if (!*pos) { 403 if (seq->op == &format2_seq_ops) 404 seq_puts(seq, "id nodeid remid pid xid exflags flags sts grmode rqmode time_ms r_nodeid r_len r_name\n"); 405 else if (seq->op == &format3_seq_ops) 406 seq_puts(seq, "rsb ptr nodeid first_lkid flags !root_list_empty !recover_list_empty recover_locks_count len\n"); 407 else if (seq->op == &format4_seq_ops) 408 seq_puts(seq, "rsb ptr nodeid master_nodeid dir_nodeid our_nodeid toss_time flags len str|hex name\n"); 409 } 410 411 if (seq->op == &format4_seq_ops) 412 list = &ls->ls_toss; 413 else 414 list = &ls->ls_keep; 415 416 read_lock_bh(&ls->ls_rsbtbl_lock); 417 return seq_list_start(list, *pos); 418 } 419 420 static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos) 421 { 422 struct dlm_ls *ls = seq->private; 423 struct list_head *list; 424 425 if (seq->op == &format4_seq_ops) 426 list = &ls->ls_toss; 427 else 428 list = &ls->ls_keep; 429 430 return seq_list_next(iter_ptr, list, pos); 431 } 432 433 static void table_seq_stop(struct seq_file *seq, void *iter_ptr) 434 { 435 struct dlm_ls *ls = seq->private; 436 437 read_unlock_bh(&ls->ls_rsbtbl_lock); 438 } 439 440 static const struct seq_operations format1_seq_ops = { 441 .start = table_seq_start, 442 .next = table_seq_next, 443 .stop = table_seq_stop, 444 .show = table_seq_show, 445 }; 446 447 static const struct seq_operations format2_seq_ops = { 448 .start = table_seq_start, 449 .next = table_seq_next, 450 .stop = table_seq_stop, 451 .show = table_seq_show, 452 }; 453 454 static const struct seq_operations format3_seq_ops = { 455 .start = table_seq_start, 456 .next = table_seq_next, 457 .stop = table_seq_stop, 458 .show = table_seq_show, 459 }; 460 461 static const struct seq_operations format4_seq_ops = { 462 .start = table_seq_start, 463 .next = table_seq_next, 464 .stop = table_seq_stop, 465 .show = table_seq_show, 466 }; 467 468 static const struct file_operations format1_fops; 469 static const struct file_operations format2_fops; 470 static const struct file_operations format3_fops; 471 static const struct file_operations format4_fops; 472 473 static int table_open1(struct inode *inode, struct file *file) 474 { 475 struct seq_file *seq; 476 int ret; 477 478 ret = seq_open(file, &format1_seq_ops); 479 if (ret) 480 return ret; 481 482 seq = file->private_data; 483 seq->private = inode->i_private; /* the dlm_ls */ 484 return 0; 485 } 486 487 static int table_open2(struct inode *inode, struct file *file) 488 { 489 struct seq_file *seq; 490 int ret; 491 492 ret = seq_open(file, &format2_seq_ops); 493 if (ret) 494 return ret; 495 496 seq = file->private_data; 497 seq->private = inode->i_private; /* the dlm_ls */ 498 return 0; 499 } 500 501 static ssize_t table_write2(struct file *file, const char __user *user_buf, 502 size_t count, loff_t *ppos) 503 { 504 struct seq_file *seq = file->private_data; 505 int n, len, lkb_nodeid, lkb_status, error; 506 char name[DLM_RESNAME_MAXLEN + 1] = {}; 507 struct dlm_ls *ls = seq->private; 508 unsigned int lkb_flags; 509 char buf[256] = {}; 510 uint32_t lkb_id; 511 512 if (copy_from_user(buf, user_buf, 513 min_t(size_t, sizeof(buf) - 1, count))) 514 return -EFAULT; 515 516 n = sscanf(buf, "%x %" __stringify(DLM_RESNAME_MAXLEN) "s %x %d %d", 517 &lkb_id, name, &lkb_flags, &lkb_nodeid, &lkb_status); 518 if (n != 5) 519 return -EINVAL; 520 521 len = strnlen(name, DLM_RESNAME_MAXLEN); 522 error = dlm_debug_add_lkb(ls, lkb_id, name, len, lkb_flags, 523 lkb_nodeid, lkb_status); 524 if (error) 525 return error; 526 527 return count; 528 } 529 530 static int table_open3(struct inode *inode, struct file *file) 531 { 532 struct seq_file *seq; 533 int ret; 534 535 ret = seq_open(file, &format3_seq_ops); 536 if (ret) 537 return ret; 538 539 seq = file->private_data; 540 seq->private = inode->i_private; /* the dlm_ls */ 541 return 0; 542 } 543 544 static int table_open4(struct inode *inode, struct file *file) 545 { 546 struct seq_file *seq; 547 int ret; 548 549 ret = seq_open(file, &format4_seq_ops); 550 if (ret) 551 return ret; 552 553 seq = file->private_data; 554 seq->private = inode->i_private; /* the dlm_ls */ 555 return 0; 556 } 557 558 static const struct file_operations format1_fops = { 559 .owner = THIS_MODULE, 560 .open = table_open1, 561 .read = seq_read, 562 .llseek = seq_lseek, 563 .release = seq_release 564 }; 565 566 static const struct file_operations format2_fops = { 567 .owner = THIS_MODULE, 568 .open = table_open2, 569 .read = seq_read, 570 .write = table_write2, 571 .llseek = seq_lseek, 572 .release = seq_release 573 }; 574 575 static const struct file_operations format3_fops = { 576 .owner = THIS_MODULE, 577 .open = table_open3, 578 .read = seq_read, 579 .llseek = seq_lseek, 580 .release = seq_release 581 }; 582 583 static const struct file_operations format4_fops = { 584 .owner = THIS_MODULE, 585 .open = table_open4, 586 .read = seq_read, 587 .llseek = seq_lseek, 588 .release = seq_release 589 }; 590 591 /* 592 * dump lkb's on the ls_waiters list 593 */ 594 static ssize_t waiters_read(struct file *file, char __user *userbuf, 595 size_t count, loff_t *ppos) 596 { 597 struct dlm_ls *ls = file->private_data; 598 struct dlm_lkb *lkb; 599 size_t len = DLM_DEBUG_BUF_LEN, pos = 0, ret, rv; 600 601 mutex_lock(&debug_buf_lock); 602 ret = dlm_lock_recovery_try(ls); 603 if (!ret) { 604 rv = -EAGAIN; 605 goto out; 606 } 607 608 spin_lock_bh(&ls->ls_waiters_lock); 609 memset(debug_buf, 0, sizeof(debug_buf)); 610 611 list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) { 612 ret = snprintf(debug_buf + pos, len - pos, "%x %d %d %s\n", 613 lkb->lkb_id, lkb->lkb_wait_type, 614 lkb->lkb_nodeid, lkb->lkb_resource->res_name); 615 if (ret >= len - pos) 616 break; 617 pos += ret; 618 } 619 spin_unlock_bh(&ls->ls_waiters_lock); 620 dlm_unlock_recovery(ls); 621 622 rv = simple_read_from_buffer(userbuf, count, ppos, debug_buf, pos); 623 out: 624 mutex_unlock(&debug_buf_lock); 625 return rv; 626 } 627 628 static ssize_t waiters_write(struct file *file, const char __user *user_buf, 629 size_t count, loff_t *ppos) 630 { 631 struct dlm_ls *ls = file->private_data; 632 int mstype, to_nodeid; 633 char buf[128] = {}; 634 uint32_t lkb_id; 635 int n, error; 636 637 if (copy_from_user(buf, user_buf, 638 min_t(size_t, sizeof(buf) - 1, count))) 639 return -EFAULT; 640 641 n = sscanf(buf, "%x %d %d", &lkb_id, &mstype, &to_nodeid); 642 if (n != 3) 643 return -EINVAL; 644 645 error = dlm_lock_recovery_try(ls); 646 if (!error) 647 return -EAGAIN; 648 649 error = dlm_debug_add_lkb_to_waiters(ls, lkb_id, mstype, to_nodeid); 650 dlm_unlock_recovery(ls); 651 if (error) 652 return error; 653 654 return count; 655 } 656 657 static const struct file_operations waiters_fops = { 658 .owner = THIS_MODULE, 659 .open = simple_open, 660 .read = waiters_read, 661 .write = waiters_write, 662 .llseek = default_llseek, 663 }; 664 665 void dlm_delete_debug_file(struct dlm_ls *ls) 666 { 667 debugfs_remove(ls->ls_debug_rsb_dentry); 668 debugfs_remove(ls->ls_debug_waiters_dentry); 669 debugfs_remove(ls->ls_debug_locks_dentry); 670 debugfs_remove(ls->ls_debug_all_dentry); 671 debugfs_remove(ls->ls_debug_toss_dentry); 672 debugfs_remove(ls->ls_debug_queued_asts_dentry); 673 } 674 675 static int dlm_state_show(struct seq_file *file, void *offset) 676 { 677 seq_printf(file, "%s\n", dlm_midcomms_state(file->private)); 678 return 0; 679 } 680 DEFINE_SHOW_ATTRIBUTE(dlm_state); 681 682 static int dlm_flags_show(struct seq_file *file, void *offset) 683 { 684 seq_printf(file, "%lu\n", dlm_midcomms_flags(file->private)); 685 return 0; 686 } 687 DEFINE_SHOW_ATTRIBUTE(dlm_flags); 688 689 static int dlm_send_queue_cnt_show(struct seq_file *file, void *offset) 690 { 691 seq_printf(file, "%d\n", dlm_midcomms_send_queue_cnt(file->private)); 692 return 0; 693 } 694 DEFINE_SHOW_ATTRIBUTE(dlm_send_queue_cnt); 695 696 static int dlm_version_show(struct seq_file *file, void *offset) 697 { 698 seq_printf(file, "0x%08x\n", dlm_midcomms_version(file->private)); 699 return 0; 700 } 701 DEFINE_SHOW_ATTRIBUTE(dlm_version); 702 703 static ssize_t dlm_rawmsg_write(struct file *fp, const char __user *user_buf, 704 size_t count, loff_t *ppos) 705 { 706 void *buf; 707 int ret; 708 709 if (count > PAGE_SIZE || count < sizeof(struct dlm_header)) 710 return -EINVAL; 711 712 buf = kmalloc(PAGE_SIZE, GFP_NOFS); 713 if (!buf) 714 return -ENOMEM; 715 716 if (copy_from_user(buf, user_buf, count)) { 717 ret = -EFAULT; 718 goto out; 719 } 720 721 ret = dlm_midcomms_rawmsg_send(fp->private_data, buf, count); 722 if (ret) 723 goto out; 724 725 kfree(buf); 726 return count; 727 728 out: 729 kfree(buf); 730 return ret; 731 } 732 733 static const struct file_operations dlm_rawmsg_fops = { 734 .open = simple_open, 735 .write = dlm_rawmsg_write, 736 .llseek = no_llseek, 737 }; 738 739 void *dlm_create_debug_comms_file(int nodeid, void *data) 740 { 741 struct dentry *d_node; 742 char name[256]; 743 744 memset(name, 0, sizeof(name)); 745 snprintf(name, 256, "%d", nodeid); 746 747 d_node = debugfs_create_dir(name, dlm_comms); 748 debugfs_create_file("state", 0444, d_node, data, &dlm_state_fops); 749 debugfs_create_file("flags", 0444, d_node, data, &dlm_flags_fops); 750 debugfs_create_file("send_queue_count", 0444, d_node, data, 751 &dlm_send_queue_cnt_fops); 752 debugfs_create_file("version", 0444, d_node, data, &dlm_version_fops); 753 debugfs_create_file("rawmsg", 0200, d_node, data, &dlm_rawmsg_fops); 754 755 return d_node; 756 } 757 758 void dlm_delete_debug_comms_file(void *ctx) 759 { 760 debugfs_remove(ctx); 761 } 762 763 void dlm_create_debug_file(struct dlm_ls *ls) 764 { 765 /* Reserve enough space for the longest file name */ 766 char name[DLM_LOCKSPACE_LEN + sizeof("_queued_asts")]; 767 768 /* format 1 */ 769 770 ls->ls_debug_rsb_dentry = debugfs_create_file(ls->ls_name, 771 S_IFREG | S_IRUGO, 772 dlm_root, 773 ls, 774 &format1_fops); 775 776 /* format 2 */ 777 778 snprintf(name, sizeof(name), "%s_locks", ls->ls_name); 779 780 ls->ls_debug_locks_dentry = debugfs_create_file(name, 781 0644, 782 dlm_root, 783 ls, 784 &format2_fops); 785 786 /* format 3 */ 787 788 snprintf(name, sizeof(name), "%s_all", ls->ls_name); 789 790 ls->ls_debug_all_dentry = debugfs_create_file(name, 791 S_IFREG | S_IRUGO, 792 dlm_root, 793 ls, 794 &format3_fops); 795 796 /* format 4 */ 797 798 snprintf(name, sizeof(name), "%s_toss", ls->ls_name); 799 800 ls->ls_debug_toss_dentry = debugfs_create_file(name, 801 S_IFREG | S_IRUGO, 802 dlm_root, 803 ls, 804 &format4_fops); 805 806 snprintf(name, sizeof(name), "%s_waiters", ls->ls_name); 807 808 ls->ls_debug_waiters_dentry = debugfs_create_file(name, 809 0644, 810 dlm_root, 811 ls, 812 &waiters_fops); 813 } 814 815 void __init dlm_register_debugfs(void) 816 { 817 mutex_init(&debug_buf_lock); 818 dlm_root = debugfs_create_dir("dlm", NULL); 819 dlm_comms = debugfs_create_dir("comms", dlm_root); 820 } 821 822 void dlm_unregister_debugfs(void) 823 { 824 debugfs_remove(dlm_root); 825 } 826 827