1 // SPDX-License-Identifier: GPL-2.0 2 #define pr_fmt(fmt) "drbd debugfs: " fmt 3 #include <linux/kernel.h> 4 #include <linux/module.h> 5 #include <linux/debugfs.h> 6 #include <linux/seq_file.h> 7 #include <linux/stat.h> 8 #include <linux/jiffies.h> 9 #include <linux/list.h> 10 11 #include "drbd_int.h" 12 #include "drbd_req.h" 13 #include "drbd_debugfs.h" 14 15 16 /********************************************************************** 17 * Whenever you change the file format, remember to bump the version. * 18 **********************************************************************/ 19 20 static struct dentry *drbd_debugfs_root; 21 static struct dentry *drbd_debugfs_version; 22 static struct dentry *drbd_debugfs_resources; 23 static struct dentry *drbd_debugfs_minors; 24 25 static void seq_print_age_or_dash(struct seq_file *m, bool valid, unsigned long dt) 26 { 27 if (valid) 28 seq_printf(m, "\t%d", jiffies_to_msecs(dt)); 29 else 30 seq_printf(m, "\t-"); 31 } 32 33 static void __seq_print_rq_state_bit(struct seq_file *m, 34 bool is_set, char *sep, const char *set_name, const char *unset_name) 35 { 36 if (is_set && set_name) { 37 seq_putc(m, *sep); 38 seq_puts(m, set_name); 39 *sep = '|'; 40 } else if (!is_set && unset_name) { 41 seq_putc(m, *sep); 42 seq_puts(m, unset_name); 43 *sep = '|'; 44 } 45 } 46 47 static void seq_print_rq_state_bit(struct seq_file *m, 48 bool is_set, char *sep, const char *set_name) 49 { 50 __seq_print_rq_state_bit(m, is_set, sep, set_name, NULL); 51 } 52 53 /* pretty print enum drbd_req_state_bits req->rq_state */ 54 static void seq_print_request_state(struct seq_file *m, struct drbd_request *req) 55 { 56 unsigned int s = req->rq_state; 57 char sep = ' '; 58 seq_printf(m, "\t0x%08x", s); 59 seq_printf(m, "\tmaster: %s", req->master_bio ? "pending" : "completed"); 60 61 /* RQ_WRITE ignored, already reported */ 62 seq_puts(m, "\tlocal:"); 63 seq_print_rq_state_bit(m, s & RQ_IN_ACT_LOG, &sep, "in-AL"); 64 seq_print_rq_state_bit(m, s & RQ_POSTPONED, &sep, "postponed"); 65 seq_print_rq_state_bit(m, s & RQ_COMPLETION_SUSP, &sep, "suspended"); 66 sep = ' '; 67 seq_print_rq_state_bit(m, s & RQ_LOCAL_PENDING, &sep, "pending"); 68 seq_print_rq_state_bit(m, s & RQ_LOCAL_COMPLETED, &sep, "completed"); 69 seq_print_rq_state_bit(m, s & RQ_LOCAL_ABORTED, &sep, "aborted"); 70 seq_print_rq_state_bit(m, s & RQ_LOCAL_OK, &sep, "ok"); 71 if (sep == ' ') 72 seq_puts(m, " -"); 73 74 /* for_each_connection ... */ 75 seq_printf(m, "\tnet:"); 76 sep = ' '; 77 seq_print_rq_state_bit(m, s & RQ_NET_PENDING, &sep, "pending"); 78 seq_print_rq_state_bit(m, s & RQ_NET_QUEUED, &sep, "queued"); 79 seq_print_rq_state_bit(m, s & RQ_NET_SENT, &sep, "sent"); 80 seq_print_rq_state_bit(m, s & RQ_NET_DONE, &sep, "done"); 81 seq_print_rq_state_bit(m, s & RQ_NET_SIS, &sep, "sis"); 82 seq_print_rq_state_bit(m, s & RQ_NET_OK, &sep, "ok"); 83 if (sep == ' ') 84 seq_puts(m, " -"); 85 86 seq_printf(m, " :"); 87 sep = ' '; 88 seq_print_rq_state_bit(m, s & RQ_EXP_RECEIVE_ACK, &sep, "B"); 89 seq_print_rq_state_bit(m, s & RQ_EXP_WRITE_ACK, &sep, "C"); 90 seq_print_rq_state_bit(m, s & RQ_EXP_BARR_ACK, &sep, "barr"); 91 if (sep == ' ') 92 seq_puts(m, " -"); 93 seq_printf(m, "\n"); 94 } 95 96 static void seq_print_one_request(struct seq_file *m, struct drbd_request *req, unsigned long now) 97 { 98 /* change anything here, fixup header below! */ 99 unsigned int s = req->rq_state; 100 101 #define RQ_HDR_1 "epoch\tsector\tsize\trw" 102 seq_printf(m, "0x%x\t%llu\t%u\t%s", 103 req->epoch, 104 (unsigned long long)req->i.sector, req->i.size >> 9, 105 (s & RQ_WRITE) ? "W" : "R"); 106 107 #define RQ_HDR_2 "\tstart\tin AL\tsubmit" 108 seq_printf(m, "\t%d", jiffies_to_msecs(now - req->start_jif)); 109 seq_print_age_or_dash(m, s & RQ_IN_ACT_LOG, now - req->in_actlog_jif); 110 seq_print_age_or_dash(m, s & RQ_LOCAL_PENDING, now - req->pre_submit_jif); 111 112 #define RQ_HDR_3 "\tsent\tacked\tdone" 113 seq_print_age_or_dash(m, s & RQ_NET_SENT, now - req->pre_send_jif); 114 seq_print_age_or_dash(m, (s & RQ_NET_SENT) && !(s & RQ_NET_PENDING), now - req->acked_jif); 115 seq_print_age_or_dash(m, s & RQ_NET_DONE, now - req->net_done_jif); 116 117 #define RQ_HDR_4 "\tstate\n" 118 seq_print_request_state(m, req); 119 } 120 #define RQ_HDR RQ_HDR_1 RQ_HDR_2 RQ_HDR_3 RQ_HDR_4 121 122 static void seq_print_minor_vnr_req(struct seq_file *m, struct drbd_request *req, unsigned long now) 123 { 124 seq_printf(m, "%u\t%u\t", req->device->minor, req->device->vnr); 125 seq_print_one_request(m, req, now); 126 } 127 128 static void seq_print_resource_pending_meta_io(struct seq_file *m, struct drbd_resource *resource, unsigned long now) 129 { 130 struct drbd_device *device; 131 unsigned int i; 132 133 seq_puts(m, "minor\tvnr\tstart\tsubmit\tintent\n"); 134 rcu_read_lock(); 135 idr_for_each_entry(&resource->devices, device, i) { 136 struct drbd_md_io tmp; 137 /* In theory this is racy, 138 * in the sense that there could have been a 139 * drbd_md_put_buffer(); drbd_md_get_buffer(); 140 * between accessing these members here. */ 141 tmp = device->md_io; 142 if (atomic_read(&tmp.in_use)) { 143 seq_printf(m, "%u\t%u\t%d\t", 144 device->minor, device->vnr, 145 jiffies_to_msecs(now - tmp.start_jif)); 146 if (time_before(tmp.submit_jif, tmp.start_jif)) 147 seq_puts(m, "-\t"); 148 else 149 seq_printf(m, "%d\t", jiffies_to_msecs(now - tmp.submit_jif)); 150 seq_printf(m, "%s\n", tmp.current_use); 151 } 152 } 153 rcu_read_unlock(); 154 } 155 156 static void seq_print_waiting_for_AL(struct seq_file *m, struct drbd_resource *resource, unsigned long now) 157 { 158 struct drbd_device *device; 159 unsigned int i; 160 161 seq_puts(m, "minor\tvnr\tage\t#waiting\n"); 162 rcu_read_lock(); 163 idr_for_each_entry(&resource->devices, device, i) { 164 unsigned long jif; 165 struct drbd_request *req; 166 int n = atomic_read(&device->ap_actlog_cnt); 167 if (n) { 168 spin_lock_irq(&device->resource->req_lock); 169 req = list_first_entry_or_null(&device->pending_master_completion[1], 170 struct drbd_request, req_pending_master_completion); 171 /* if the oldest request does not wait for the activity log 172 * it is not interesting for us here */ 173 if (req && !(req->rq_state & RQ_IN_ACT_LOG)) 174 jif = req->start_jif; 175 else 176 req = NULL; 177 spin_unlock_irq(&device->resource->req_lock); 178 } 179 if (n) { 180 seq_printf(m, "%u\t%u\t", device->minor, device->vnr); 181 if (req) 182 seq_printf(m, "%u\t", jiffies_to_msecs(now - jif)); 183 else 184 seq_puts(m, "-\t"); 185 seq_printf(m, "%u\n", n); 186 } 187 } 188 rcu_read_unlock(); 189 } 190 191 static void seq_print_device_bitmap_io(struct seq_file *m, struct drbd_device *device, unsigned long now) 192 { 193 struct drbd_bm_aio_ctx *ctx; 194 unsigned long start_jif; 195 unsigned int in_flight; 196 unsigned int flags; 197 spin_lock_irq(&device->resource->req_lock); 198 ctx = list_first_entry_or_null(&device->pending_bitmap_io, struct drbd_bm_aio_ctx, list); 199 if (ctx && ctx->done) 200 ctx = NULL; 201 if (ctx) { 202 start_jif = ctx->start_jif; 203 in_flight = atomic_read(&ctx->in_flight); 204 flags = ctx->flags; 205 } 206 spin_unlock_irq(&device->resource->req_lock); 207 if (ctx) { 208 seq_printf(m, "%u\t%u\t%c\t%u\t%u\n", 209 device->minor, device->vnr, 210 (flags & BM_AIO_READ) ? 'R' : 'W', 211 jiffies_to_msecs(now - start_jif), 212 in_flight); 213 } 214 } 215 216 static void seq_print_resource_pending_bitmap_io(struct seq_file *m, struct drbd_resource *resource, unsigned long now) 217 { 218 struct drbd_device *device; 219 unsigned int i; 220 221 seq_puts(m, "minor\tvnr\trw\tage\t#in-flight\n"); 222 rcu_read_lock(); 223 idr_for_each_entry(&resource->devices, device, i) { 224 seq_print_device_bitmap_io(m, device, now); 225 } 226 rcu_read_unlock(); 227 } 228 229 /* pretty print enum peer_req->flags */ 230 static void seq_print_peer_request_flags(struct seq_file *m, struct drbd_peer_request *peer_req) 231 { 232 unsigned long f = peer_req->flags; 233 char sep = ' '; 234 235 __seq_print_rq_state_bit(m, f & EE_SUBMITTED, &sep, "submitted", "preparing"); 236 __seq_print_rq_state_bit(m, f & EE_APPLICATION, &sep, "application", "internal"); 237 seq_print_rq_state_bit(m, f & EE_CALL_AL_COMPLETE_IO, &sep, "in-AL"); 238 seq_print_rq_state_bit(m, f & EE_SEND_WRITE_ACK, &sep, "C"); 239 seq_print_rq_state_bit(m, f & EE_MAY_SET_IN_SYNC, &sep, "set-in-sync"); 240 seq_print_rq_state_bit(m, f & EE_TRIM, &sep, "trim"); 241 seq_print_rq_state_bit(m, f & EE_ZEROOUT, &sep, "zero-out"); 242 seq_print_rq_state_bit(m, f & EE_WRITE_SAME, &sep, "write-same"); 243 seq_putc(m, '\n'); 244 } 245 246 static void seq_print_peer_request(struct seq_file *m, 247 struct drbd_device *device, struct list_head *lh, 248 unsigned long now) 249 { 250 bool reported_preparing = false; 251 struct drbd_peer_request *peer_req; 252 list_for_each_entry(peer_req, lh, w.list) { 253 if (reported_preparing && !(peer_req->flags & EE_SUBMITTED)) 254 continue; 255 256 if (device) 257 seq_printf(m, "%u\t%u\t", device->minor, device->vnr); 258 259 seq_printf(m, "%llu\t%u\t%c\t%u\t", 260 (unsigned long long)peer_req->i.sector, peer_req->i.size >> 9, 261 (peer_req->flags & EE_WRITE) ? 'W' : 'R', 262 jiffies_to_msecs(now - peer_req->submit_jif)); 263 seq_print_peer_request_flags(m, peer_req); 264 if (peer_req->flags & EE_SUBMITTED) 265 break; 266 else 267 reported_preparing = true; 268 } 269 } 270 271 static void seq_print_device_peer_requests(struct seq_file *m, 272 struct drbd_device *device, unsigned long now) 273 { 274 seq_puts(m, "minor\tvnr\tsector\tsize\trw\tage\tflags\n"); 275 spin_lock_irq(&device->resource->req_lock); 276 seq_print_peer_request(m, device, &device->active_ee, now); 277 seq_print_peer_request(m, device, &device->read_ee, now); 278 seq_print_peer_request(m, device, &device->sync_ee, now); 279 spin_unlock_irq(&device->resource->req_lock); 280 if (test_bit(FLUSH_PENDING, &device->flags)) { 281 seq_printf(m, "%u\t%u\t-\t-\tF\t%u\tflush\n", 282 device->minor, device->vnr, 283 jiffies_to_msecs(now - device->flush_jif)); 284 } 285 } 286 287 static void seq_print_resource_pending_peer_requests(struct seq_file *m, 288 struct drbd_resource *resource, unsigned long now) 289 { 290 struct drbd_device *device; 291 unsigned int i; 292 293 rcu_read_lock(); 294 idr_for_each_entry(&resource->devices, device, i) { 295 seq_print_device_peer_requests(m, device, now); 296 } 297 rcu_read_unlock(); 298 } 299 300 static void seq_print_resource_transfer_log_summary(struct seq_file *m, 301 struct drbd_resource *resource, 302 struct drbd_connection *connection, 303 unsigned long now) 304 { 305 struct drbd_request *req; 306 unsigned int count = 0; 307 unsigned int show_state = 0; 308 309 seq_puts(m, "n\tdevice\tvnr\t" RQ_HDR); 310 spin_lock_irq(&resource->req_lock); 311 list_for_each_entry(req, &connection->transfer_log, tl_requests) { 312 unsigned int tmp = 0; 313 unsigned int s; 314 ++count; 315 316 /* don't disable irq "forever" */ 317 if (!(count & 0x1ff)) { 318 struct drbd_request *req_next; 319 kref_get(&req->kref); 320 spin_unlock_irq(&resource->req_lock); 321 cond_resched(); 322 spin_lock_irq(&resource->req_lock); 323 req_next = list_next_entry(req, tl_requests); 324 if (kref_put(&req->kref, drbd_req_destroy)) 325 req = req_next; 326 if (&req->tl_requests == &connection->transfer_log) 327 break; 328 } 329 330 s = req->rq_state; 331 332 /* This is meant to summarize timing issues, to be able to tell 333 * local disk problems from network problems. 334 * Skip requests, if we have shown an even older request with 335 * similar aspects already. */ 336 if (req->master_bio == NULL) 337 tmp |= 1; 338 if ((s & RQ_LOCAL_MASK) && (s & RQ_LOCAL_PENDING)) 339 tmp |= 2; 340 if (s & RQ_NET_MASK) { 341 if (!(s & RQ_NET_SENT)) 342 tmp |= 4; 343 if (s & RQ_NET_PENDING) 344 tmp |= 8; 345 if (!(s & RQ_NET_DONE)) 346 tmp |= 16; 347 } 348 if ((tmp & show_state) == tmp) 349 continue; 350 show_state |= tmp; 351 seq_printf(m, "%u\t", count); 352 seq_print_minor_vnr_req(m, req, now); 353 if (show_state == 0x1f) 354 break; 355 } 356 spin_unlock_irq(&resource->req_lock); 357 } 358 359 /* TODO: transfer_log and friends should be moved to resource */ 360 static int in_flight_summary_show(struct seq_file *m, void *pos) 361 { 362 struct drbd_resource *resource = m->private; 363 struct drbd_connection *connection; 364 unsigned long jif = jiffies; 365 366 connection = first_connection(resource); 367 /* This does not happen, actually. 368 * But be robust and prepare for future code changes. */ 369 if (!connection || !kref_get_unless_zero(&connection->kref)) 370 return -ESTALE; 371 372 /* BUMP me if you change the file format/content/presentation */ 373 seq_printf(m, "v: %u\n\n", 0); 374 375 seq_puts(m, "oldest bitmap IO\n"); 376 seq_print_resource_pending_bitmap_io(m, resource, jif); 377 seq_putc(m, '\n'); 378 379 seq_puts(m, "meta data IO\n"); 380 seq_print_resource_pending_meta_io(m, resource, jif); 381 seq_putc(m, '\n'); 382 383 seq_puts(m, "socket buffer stats\n"); 384 /* for each connection ... once we have more than one */ 385 rcu_read_lock(); 386 if (connection->data.socket) { 387 /* open coded SIOCINQ, the "relevant" part */ 388 struct tcp_sock *tp = tcp_sk(connection->data.socket->sk); 389 int answ = tp->rcv_nxt - tp->copied_seq; 390 seq_printf(m, "unread receive buffer: %u Byte\n", answ); 391 /* open coded SIOCOUTQ, the "relevant" part */ 392 answ = tp->write_seq - tp->snd_una; 393 seq_printf(m, "unacked send buffer: %u Byte\n", answ); 394 } 395 rcu_read_unlock(); 396 seq_putc(m, '\n'); 397 398 seq_puts(m, "oldest peer requests\n"); 399 seq_print_resource_pending_peer_requests(m, resource, jif); 400 seq_putc(m, '\n'); 401 402 seq_puts(m, "application requests waiting for activity log\n"); 403 seq_print_waiting_for_AL(m, resource, jif); 404 seq_putc(m, '\n'); 405 406 seq_puts(m, "oldest application requests\n"); 407 seq_print_resource_transfer_log_summary(m, resource, connection, jif); 408 seq_putc(m, '\n'); 409 410 jif = jiffies - jif; 411 if (jif) 412 seq_printf(m, "generated in %d ms\n", jiffies_to_msecs(jif)); 413 kref_put(&connection->kref, drbd_destroy_connection); 414 return 0; 415 } 416 417 /* make sure at *open* time that the respective object won't go away. */ 418 static int drbd_single_open(struct file *file, int (*show)(struct seq_file *, void *), 419 void *data, struct kref *kref, 420 void (*release)(struct kref *)) 421 { 422 struct dentry *parent; 423 int ret = -ESTALE; 424 425 /* Are we still linked, 426 * or has debugfs_remove() already been called? */ 427 parent = file->f_path.dentry->d_parent; 428 /* serialize with d_delete() */ 429 inode_lock(d_inode(parent)); 430 /* Make sure the object is still alive */ 431 if (simple_positive(file->f_path.dentry) 432 && kref_get_unless_zero(kref)) 433 ret = 0; 434 inode_unlock(d_inode(parent)); 435 if (!ret) { 436 ret = single_open(file, show, data); 437 if (ret) 438 kref_put(kref, release); 439 } 440 return ret; 441 } 442 443 static int in_flight_summary_open(struct inode *inode, struct file *file) 444 { 445 struct drbd_resource *resource = inode->i_private; 446 return drbd_single_open(file, in_flight_summary_show, resource, 447 &resource->kref, drbd_destroy_resource); 448 } 449 450 static int in_flight_summary_release(struct inode *inode, struct file *file) 451 { 452 struct drbd_resource *resource = inode->i_private; 453 kref_put(&resource->kref, drbd_destroy_resource); 454 return single_release(inode, file); 455 } 456 457 static const struct file_operations in_flight_summary_fops = { 458 .owner = THIS_MODULE, 459 .open = in_flight_summary_open, 460 .read = seq_read, 461 .llseek = seq_lseek, 462 .release = in_flight_summary_release, 463 }; 464 465 void drbd_debugfs_resource_add(struct drbd_resource *resource) 466 { 467 struct dentry *dentry; 468 if (!drbd_debugfs_resources) 469 return; 470 471 dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources); 472 if (IS_ERR_OR_NULL(dentry)) 473 goto fail; 474 resource->debugfs_res = dentry; 475 476 dentry = debugfs_create_dir("volumes", resource->debugfs_res); 477 if (IS_ERR_OR_NULL(dentry)) 478 goto fail; 479 resource->debugfs_res_volumes = dentry; 480 481 dentry = debugfs_create_dir("connections", resource->debugfs_res); 482 if (IS_ERR_OR_NULL(dentry)) 483 goto fail; 484 resource->debugfs_res_connections = dentry; 485 486 dentry = debugfs_create_file("in_flight_summary", 0440, 487 resource->debugfs_res, resource, 488 &in_flight_summary_fops); 489 if (IS_ERR_OR_NULL(dentry)) 490 goto fail; 491 resource->debugfs_res_in_flight_summary = dentry; 492 return; 493 494 fail: 495 drbd_debugfs_resource_cleanup(resource); 496 drbd_err(resource, "failed to create debugfs dentry\n"); 497 } 498 499 static void drbd_debugfs_remove(struct dentry **dp) 500 { 501 debugfs_remove(*dp); 502 *dp = NULL; 503 } 504 505 void drbd_debugfs_resource_cleanup(struct drbd_resource *resource) 506 { 507 /* it is ok to call debugfs_remove(NULL) */ 508 drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary); 509 drbd_debugfs_remove(&resource->debugfs_res_connections); 510 drbd_debugfs_remove(&resource->debugfs_res_volumes); 511 drbd_debugfs_remove(&resource->debugfs_res); 512 } 513 514 static void seq_print_one_timing_detail(struct seq_file *m, 515 const struct drbd_thread_timing_details *tdp, 516 unsigned long now) 517 { 518 struct drbd_thread_timing_details td; 519 /* No locking... 520 * use temporary assignment to get at consistent data. */ 521 do { 522 td = *tdp; 523 } while (td.cb_nr != tdp->cb_nr); 524 if (!td.cb_addr) 525 return; 526 seq_printf(m, "%u\t%d\t%s:%u\t%ps\n", 527 td.cb_nr, 528 jiffies_to_msecs(now - td.start_jif), 529 td.caller_fn, td.line, 530 td.cb_addr); 531 } 532 533 static void seq_print_timing_details(struct seq_file *m, 534 const char *title, 535 unsigned int cb_nr, struct drbd_thread_timing_details *tdp, unsigned long now) 536 { 537 unsigned int start_idx; 538 unsigned int i; 539 540 seq_printf(m, "%s\n", title); 541 /* If not much is going on, this will result in natural ordering. 542 * If it is very busy, we will possibly skip events, or even see wrap 543 * arounds, which could only be avoided with locking. 544 */ 545 start_idx = cb_nr % DRBD_THREAD_DETAILS_HIST; 546 for (i = start_idx; i < DRBD_THREAD_DETAILS_HIST; i++) 547 seq_print_one_timing_detail(m, tdp+i, now); 548 for (i = 0; i < start_idx; i++) 549 seq_print_one_timing_detail(m, tdp+i, now); 550 } 551 552 static int callback_history_show(struct seq_file *m, void *ignored) 553 { 554 struct drbd_connection *connection = m->private; 555 unsigned long jif = jiffies; 556 557 /* BUMP me if you change the file format/content/presentation */ 558 seq_printf(m, "v: %u\n\n", 0); 559 560 seq_puts(m, "n\tage\tcallsite\tfn\n"); 561 seq_print_timing_details(m, "worker", connection->w_cb_nr, connection->w_timing_details, jif); 562 seq_print_timing_details(m, "receiver", connection->r_cb_nr, connection->r_timing_details, jif); 563 return 0; 564 } 565 566 static int callback_history_open(struct inode *inode, struct file *file) 567 { 568 struct drbd_connection *connection = inode->i_private; 569 return drbd_single_open(file, callback_history_show, connection, 570 &connection->kref, drbd_destroy_connection); 571 } 572 573 static int callback_history_release(struct inode *inode, struct file *file) 574 { 575 struct drbd_connection *connection = inode->i_private; 576 kref_put(&connection->kref, drbd_destroy_connection); 577 return single_release(inode, file); 578 } 579 580 static const struct file_operations connection_callback_history_fops = { 581 .owner = THIS_MODULE, 582 .open = callback_history_open, 583 .read = seq_read, 584 .llseek = seq_lseek, 585 .release = callback_history_release, 586 }; 587 588 static int connection_oldest_requests_show(struct seq_file *m, void *ignored) 589 { 590 struct drbd_connection *connection = m->private; 591 unsigned long now = jiffies; 592 struct drbd_request *r1, *r2; 593 594 /* BUMP me if you change the file format/content/presentation */ 595 seq_printf(m, "v: %u\n\n", 0); 596 597 spin_lock_irq(&connection->resource->req_lock); 598 r1 = connection->req_next; 599 if (r1) 600 seq_print_minor_vnr_req(m, r1, now); 601 r2 = connection->req_ack_pending; 602 if (r2 && r2 != r1) { 603 r1 = r2; 604 seq_print_minor_vnr_req(m, r1, now); 605 } 606 r2 = connection->req_not_net_done; 607 if (r2 && r2 != r1) 608 seq_print_minor_vnr_req(m, r2, now); 609 spin_unlock_irq(&connection->resource->req_lock); 610 return 0; 611 } 612 613 static int connection_oldest_requests_open(struct inode *inode, struct file *file) 614 { 615 struct drbd_connection *connection = inode->i_private; 616 return drbd_single_open(file, connection_oldest_requests_show, connection, 617 &connection->kref, drbd_destroy_connection); 618 } 619 620 static int connection_oldest_requests_release(struct inode *inode, struct file *file) 621 { 622 struct drbd_connection *connection = inode->i_private; 623 kref_put(&connection->kref, drbd_destroy_connection); 624 return single_release(inode, file); 625 } 626 627 static const struct file_operations connection_oldest_requests_fops = { 628 .owner = THIS_MODULE, 629 .open = connection_oldest_requests_open, 630 .read = seq_read, 631 .llseek = seq_lseek, 632 .release = connection_oldest_requests_release, 633 }; 634 635 void drbd_debugfs_connection_add(struct drbd_connection *connection) 636 { 637 struct dentry *conns_dir = connection->resource->debugfs_res_connections; 638 struct dentry *dentry; 639 if (!conns_dir) 640 return; 641 642 /* Once we enable mutliple peers, 643 * these connections will have descriptive names. 644 * For now, it is just the one connection to the (only) "peer". */ 645 dentry = debugfs_create_dir("peer", conns_dir); 646 if (IS_ERR_OR_NULL(dentry)) 647 goto fail; 648 connection->debugfs_conn = dentry; 649 650 dentry = debugfs_create_file("callback_history", 0440, 651 connection->debugfs_conn, connection, 652 &connection_callback_history_fops); 653 if (IS_ERR_OR_NULL(dentry)) 654 goto fail; 655 connection->debugfs_conn_callback_history = dentry; 656 657 dentry = debugfs_create_file("oldest_requests", 0440, 658 connection->debugfs_conn, connection, 659 &connection_oldest_requests_fops); 660 if (IS_ERR_OR_NULL(dentry)) 661 goto fail; 662 connection->debugfs_conn_oldest_requests = dentry; 663 return; 664 665 fail: 666 drbd_debugfs_connection_cleanup(connection); 667 drbd_err(connection, "failed to create debugfs dentry\n"); 668 } 669 670 void drbd_debugfs_connection_cleanup(struct drbd_connection *connection) 671 { 672 drbd_debugfs_remove(&connection->debugfs_conn_callback_history); 673 drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests); 674 drbd_debugfs_remove(&connection->debugfs_conn); 675 } 676 677 static void resync_dump_detail(struct seq_file *m, struct lc_element *e) 678 { 679 struct bm_extent *bme = lc_entry(e, struct bm_extent, lce); 680 681 seq_printf(m, "%5d %s %s %s", bme->rs_left, 682 test_bit(BME_NO_WRITES, &bme->flags) ? "NO_WRITES" : "---------", 683 test_bit(BME_LOCKED, &bme->flags) ? "LOCKED" : "------", 684 test_bit(BME_PRIORITY, &bme->flags) ? "PRIORITY" : "--------" 685 ); 686 } 687 688 static int device_resync_extents_show(struct seq_file *m, void *ignored) 689 { 690 struct drbd_device *device = m->private; 691 692 /* BUMP me if you change the file format/content/presentation */ 693 seq_printf(m, "v: %u\n\n", 0); 694 695 if (get_ldev_if_state(device, D_FAILED)) { 696 lc_seq_printf_stats(m, device->resync); 697 lc_seq_dump_details(m, device->resync, "rs_left flags", resync_dump_detail); 698 put_ldev(device); 699 } 700 return 0; 701 } 702 703 static int device_act_log_extents_show(struct seq_file *m, void *ignored) 704 { 705 struct drbd_device *device = m->private; 706 707 /* BUMP me if you change the file format/content/presentation */ 708 seq_printf(m, "v: %u\n\n", 0); 709 710 if (get_ldev_if_state(device, D_FAILED)) { 711 lc_seq_printf_stats(m, device->act_log); 712 lc_seq_dump_details(m, device->act_log, "", NULL); 713 put_ldev(device); 714 } 715 return 0; 716 } 717 718 static int device_oldest_requests_show(struct seq_file *m, void *ignored) 719 { 720 struct drbd_device *device = m->private; 721 struct drbd_resource *resource = device->resource; 722 unsigned long now = jiffies; 723 struct drbd_request *r1, *r2; 724 int i; 725 726 /* BUMP me if you change the file format/content/presentation */ 727 seq_printf(m, "v: %u\n\n", 0); 728 729 seq_puts(m, RQ_HDR); 730 spin_lock_irq(&resource->req_lock); 731 /* WRITE, then READ */ 732 for (i = 1; i >= 0; --i) { 733 r1 = list_first_entry_or_null(&device->pending_master_completion[i], 734 struct drbd_request, req_pending_master_completion); 735 r2 = list_first_entry_or_null(&device->pending_completion[i], 736 struct drbd_request, req_pending_local); 737 if (r1) 738 seq_print_one_request(m, r1, now); 739 if (r2 && r2 != r1) 740 seq_print_one_request(m, r2, now); 741 } 742 spin_unlock_irq(&resource->req_lock); 743 return 0; 744 } 745 746 static int device_data_gen_id_show(struct seq_file *m, void *ignored) 747 { 748 struct drbd_device *device = m->private; 749 struct drbd_md *md; 750 enum drbd_uuid_index idx; 751 752 if (!get_ldev_if_state(device, D_FAILED)) 753 return -ENODEV; 754 755 md = &device->ldev->md; 756 spin_lock_irq(&md->uuid_lock); 757 for (idx = UI_CURRENT; idx <= UI_HISTORY_END; idx++) { 758 seq_printf(m, "0x%016llX\n", md->uuid[idx]); 759 } 760 spin_unlock_irq(&md->uuid_lock); 761 put_ldev(device); 762 return 0; 763 } 764 765 static int device_ed_gen_id_show(struct seq_file *m, void *ignored) 766 { 767 struct drbd_device *device = m->private; 768 seq_printf(m, "0x%016llX\n", (unsigned long long)device->ed_uuid); 769 return 0; 770 } 771 772 #define drbd_debugfs_device_attr(name) \ 773 static int device_ ## name ## _open(struct inode *inode, struct file *file) \ 774 { \ 775 struct drbd_device *device = inode->i_private; \ 776 return drbd_single_open(file, device_ ## name ## _show, device, \ 777 &device->kref, drbd_destroy_device); \ 778 } \ 779 static int device_ ## name ## _release(struct inode *inode, struct file *file) \ 780 { \ 781 struct drbd_device *device = inode->i_private; \ 782 kref_put(&device->kref, drbd_destroy_device); \ 783 return single_release(inode, file); \ 784 } \ 785 static const struct file_operations device_ ## name ## _fops = { \ 786 .owner = THIS_MODULE, \ 787 .open = device_ ## name ## _open, \ 788 .read = seq_read, \ 789 .llseek = seq_lseek, \ 790 .release = device_ ## name ## _release, \ 791 }; 792 793 drbd_debugfs_device_attr(oldest_requests) 794 drbd_debugfs_device_attr(act_log_extents) 795 drbd_debugfs_device_attr(resync_extents) 796 drbd_debugfs_device_attr(data_gen_id) 797 drbd_debugfs_device_attr(ed_gen_id) 798 799 void drbd_debugfs_device_add(struct drbd_device *device) 800 { 801 struct dentry *vols_dir = device->resource->debugfs_res_volumes; 802 char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */ 803 char vnr_buf[8]; /* volume number vnr is even 16 bit only; */ 804 char *slink_name = NULL; 805 806 struct dentry *dentry; 807 if (!vols_dir || !drbd_debugfs_minors) 808 return; 809 810 snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr); 811 dentry = debugfs_create_dir(vnr_buf, vols_dir); 812 if (IS_ERR_OR_NULL(dentry)) 813 goto fail; 814 device->debugfs_vol = dentry; 815 816 snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor); 817 slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u", 818 device->resource->name, device->vnr); 819 if (!slink_name) 820 goto fail; 821 dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name); 822 kfree(slink_name); 823 slink_name = NULL; 824 if (IS_ERR_OR_NULL(dentry)) 825 goto fail; 826 device->debugfs_minor = dentry; 827 828 #define DCF(name) do { \ 829 dentry = debugfs_create_file(#name, 0440, \ 830 device->debugfs_vol, device, \ 831 &device_ ## name ## _fops); \ 832 if (IS_ERR_OR_NULL(dentry)) \ 833 goto fail; \ 834 device->debugfs_vol_ ## name = dentry; \ 835 } while (0) 836 837 DCF(oldest_requests); 838 DCF(act_log_extents); 839 DCF(resync_extents); 840 DCF(data_gen_id); 841 DCF(ed_gen_id); 842 #undef DCF 843 return; 844 845 fail: 846 drbd_debugfs_device_cleanup(device); 847 drbd_err(device, "failed to create debugfs entries\n"); 848 } 849 850 void drbd_debugfs_device_cleanup(struct drbd_device *device) 851 { 852 drbd_debugfs_remove(&device->debugfs_minor); 853 drbd_debugfs_remove(&device->debugfs_vol_oldest_requests); 854 drbd_debugfs_remove(&device->debugfs_vol_act_log_extents); 855 drbd_debugfs_remove(&device->debugfs_vol_resync_extents); 856 drbd_debugfs_remove(&device->debugfs_vol_data_gen_id); 857 drbd_debugfs_remove(&device->debugfs_vol_ed_gen_id); 858 drbd_debugfs_remove(&device->debugfs_vol); 859 } 860 861 void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device) 862 { 863 struct dentry *conn_dir = peer_device->connection->debugfs_conn; 864 struct dentry *dentry; 865 char vnr_buf[8]; 866 867 if (!conn_dir) 868 return; 869 870 snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr); 871 dentry = debugfs_create_dir(vnr_buf, conn_dir); 872 if (IS_ERR_OR_NULL(dentry)) 873 goto fail; 874 peer_device->debugfs_peer_dev = dentry; 875 return; 876 877 fail: 878 drbd_debugfs_peer_device_cleanup(peer_device); 879 drbd_err(peer_device, "failed to create debugfs entries\n"); 880 } 881 882 void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device) 883 { 884 drbd_debugfs_remove(&peer_device->debugfs_peer_dev); 885 } 886 887 static int drbd_version_show(struct seq_file *m, void *ignored) 888 { 889 seq_printf(m, "# %s\n", drbd_buildtag()); 890 seq_printf(m, "VERSION=%s\n", REL_VERSION); 891 seq_printf(m, "API_VERSION=%u\n", API_VERSION); 892 seq_printf(m, "PRO_VERSION_MIN=%u\n", PRO_VERSION_MIN); 893 seq_printf(m, "PRO_VERSION_MAX=%u\n", PRO_VERSION_MAX); 894 return 0; 895 } 896 897 static int drbd_version_open(struct inode *inode, struct file *file) 898 { 899 return single_open(file, drbd_version_show, NULL); 900 } 901 902 static const struct file_operations drbd_version_fops = { 903 .owner = THIS_MODULE, 904 .open = drbd_version_open, 905 .llseek = seq_lseek, 906 .read = seq_read, 907 .release = single_release, 908 }; 909 910 /* not __exit, may be indirectly called 911 * from the module-load-failure path as well. */ 912 void drbd_debugfs_cleanup(void) 913 { 914 drbd_debugfs_remove(&drbd_debugfs_resources); 915 drbd_debugfs_remove(&drbd_debugfs_minors); 916 drbd_debugfs_remove(&drbd_debugfs_version); 917 drbd_debugfs_remove(&drbd_debugfs_root); 918 } 919 920 int __init drbd_debugfs_init(void) 921 { 922 struct dentry *dentry; 923 924 dentry = debugfs_create_dir("drbd", NULL); 925 if (IS_ERR_OR_NULL(dentry)) 926 goto fail; 927 drbd_debugfs_root = dentry; 928 929 dentry = debugfs_create_file("version", 0444, drbd_debugfs_root, NULL, &drbd_version_fops); 930 if (IS_ERR_OR_NULL(dentry)) 931 goto fail; 932 drbd_debugfs_version = dentry; 933 934 dentry = debugfs_create_dir("resources", drbd_debugfs_root); 935 if (IS_ERR_OR_NULL(dentry)) 936 goto fail; 937 drbd_debugfs_resources = dentry; 938 939 dentry = debugfs_create_dir("minors", drbd_debugfs_root); 940 if (IS_ERR_OR_NULL(dentry)) 941 goto fail; 942 drbd_debugfs_minors = dentry; 943 return 0; 944 945 fail: 946 drbd_debugfs_cleanup(); 947 if (dentry) 948 return PTR_ERR(dentry); 949 else 950 return -EINVAL; 951 } 952