1 // SPDX-License-Identifier: GPL-2.0-only 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; 468 469 dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources); 470 resource->debugfs_res = dentry; 471 472 dentry = debugfs_create_dir("volumes", resource->debugfs_res); 473 resource->debugfs_res_volumes = dentry; 474 475 dentry = debugfs_create_dir("connections", resource->debugfs_res); 476 resource->debugfs_res_connections = dentry; 477 478 dentry = debugfs_create_file("in_flight_summary", 0440, 479 resource->debugfs_res, resource, 480 &in_flight_summary_fops); 481 resource->debugfs_res_in_flight_summary = dentry; 482 } 483 484 static void drbd_debugfs_remove(struct dentry **dp) 485 { 486 debugfs_remove(*dp); 487 *dp = NULL; 488 } 489 490 void drbd_debugfs_resource_cleanup(struct drbd_resource *resource) 491 { 492 /* it is ok to call debugfs_remove(NULL) */ 493 drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary); 494 drbd_debugfs_remove(&resource->debugfs_res_connections); 495 drbd_debugfs_remove(&resource->debugfs_res_volumes); 496 drbd_debugfs_remove(&resource->debugfs_res); 497 } 498 499 static void seq_print_one_timing_detail(struct seq_file *m, 500 const struct drbd_thread_timing_details *tdp, 501 unsigned long now) 502 { 503 struct drbd_thread_timing_details td; 504 /* No locking... 505 * use temporary assignment to get at consistent data. */ 506 do { 507 td = *tdp; 508 } while (td.cb_nr != tdp->cb_nr); 509 if (!td.cb_addr) 510 return; 511 seq_printf(m, "%u\t%d\t%s:%u\t%ps\n", 512 td.cb_nr, 513 jiffies_to_msecs(now - td.start_jif), 514 td.caller_fn, td.line, 515 td.cb_addr); 516 } 517 518 static void seq_print_timing_details(struct seq_file *m, 519 const char *title, 520 unsigned int cb_nr, struct drbd_thread_timing_details *tdp, unsigned long now) 521 { 522 unsigned int start_idx; 523 unsigned int i; 524 525 seq_printf(m, "%s\n", title); 526 /* If not much is going on, this will result in natural ordering. 527 * If it is very busy, we will possibly skip events, or even see wrap 528 * arounds, which could only be avoided with locking. 529 */ 530 start_idx = cb_nr % DRBD_THREAD_DETAILS_HIST; 531 for (i = start_idx; i < DRBD_THREAD_DETAILS_HIST; i++) 532 seq_print_one_timing_detail(m, tdp+i, now); 533 for (i = 0; i < start_idx; i++) 534 seq_print_one_timing_detail(m, tdp+i, now); 535 } 536 537 static int callback_history_show(struct seq_file *m, void *ignored) 538 { 539 struct drbd_connection *connection = m->private; 540 unsigned long jif = jiffies; 541 542 /* BUMP me if you change the file format/content/presentation */ 543 seq_printf(m, "v: %u\n\n", 0); 544 545 seq_puts(m, "n\tage\tcallsite\tfn\n"); 546 seq_print_timing_details(m, "worker", connection->w_cb_nr, connection->w_timing_details, jif); 547 seq_print_timing_details(m, "receiver", connection->r_cb_nr, connection->r_timing_details, jif); 548 return 0; 549 } 550 551 static int callback_history_open(struct inode *inode, struct file *file) 552 { 553 struct drbd_connection *connection = inode->i_private; 554 return drbd_single_open(file, callback_history_show, connection, 555 &connection->kref, drbd_destroy_connection); 556 } 557 558 static int callback_history_release(struct inode *inode, struct file *file) 559 { 560 struct drbd_connection *connection = inode->i_private; 561 kref_put(&connection->kref, drbd_destroy_connection); 562 return single_release(inode, file); 563 } 564 565 static const struct file_operations connection_callback_history_fops = { 566 .owner = THIS_MODULE, 567 .open = callback_history_open, 568 .read = seq_read, 569 .llseek = seq_lseek, 570 .release = callback_history_release, 571 }; 572 573 static int connection_oldest_requests_show(struct seq_file *m, void *ignored) 574 { 575 struct drbd_connection *connection = m->private; 576 unsigned long now = jiffies; 577 struct drbd_request *r1, *r2; 578 579 /* BUMP me if you change the file format/content/presentation */ 580 seq_printf(m, "v: %u\n\n", 0); 581 582 spin_lock_irq(&connection->resource->req_lock); 583 r1 = connection->req_next; 584 if (r1) 585 seq_print_minor_vnr_req(m, r1, now); 586 r2 = connection->req_ack_pending; 587 if (r2 && r2 != r1) { 588 r1 = r2; 589 seq_print_minor_vnr_req(m, r1, now); 590 } 591 r2 = connection->req_not_net_done; 592 if (r2 && r2 != r1) 593 seq_print_minor_vnr_req(m, r2, now); 594 spin_unlock_irq(&connection->resource->req_lock); 595 return 0; 596 } 597 598 static int connection_oldest_requests_open(struct inode *inode, struct file *file) 599 { 600 struct drbd_connection *connection = inode->i_private; 601 return drbd_single_open(file, connection_oldest_requests_show, connection, 602 &connection->kref, drbd_destroy_connection); 603 } 604 605 static int connection_oldest_requests_release(struct inode *inode, struct file *file) 606 { 607 struct drbd_connection *connection = inode->i_private; 608 kref_put(&connection->kref, drbd_destroy_connection); 609 return single_release(inode, file); 610 } 611 612 static const struct file_operations connection_oldest_requests_fops = { 613 .owner = THIS_MODULE, 614 .open = connection_oldest_requests_open, 615 .read = seq_read, 616 .llseek = seq_lseek, 617 .release = connection_oldest_requests_release, 618 }; 619 620 void drbd_debugfs_connection_add(struct drbd_connection *connection) 621 { 622 struct dentry *conns_dir = connection->resource->debugfs_res_connections; 623 struct dentry *dentry; 624 625 /* Once we enable mutliple peers, 626 * these connections will have descriptive names. 627 * For now, it is just the one connection to the (only) "peer". */ 628 dentry = debugfs_create_dir("peer", conns_dir); 629 connection->debugfs_conn = dentry; 630 631 dentry = debugfs_create_file("callback_history", 0440, 632 connection->debugfs_conn, connection, 633 &connection_callback_history_fops); 634 connection->debugfs_conn_callback_history = dentry; 635 636 dentry = debugfs_create_file("oldest_requests", 0440, 637 connection->debugfs_conn, connection, 638 &connection_oldest_requests_fops); 639 connection->debugfs_conn_oldest_requests = dentry; 640 } 641 642 void drbd_debugfs_connection_cleanup(struct drbd_connection *connection) 643 { 644 drbd_debugfs_remove(&connection->debugfs_conn_callback_history); 645 drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests); 646 drbd_debugfs_remove(&connection->debugfs_conn); 647 } 648 649 static void resync_dump_detail(struct seq_file *m, struct lc_element *e) 650 { 651 struct bm_extent *bme = lc_entry(e, struct bm_extent, lce); 652 653 seq_printf(m, "%5d %s %s %s", bme->rs_left, 654 test_bit(BME_NO_WRITES, &bme->flags) ? "NO_WRITES" : "---------", 655 test_bit(BME_LOCKED, &bme->flags) ? "LOCKED" : "------", 656 test_bit(BME_PRIORITY, &bme->flags) ? "PRIORITY" : "--------" 657 ); 658 } 659 660 static int device_resync_extents_show(struct seq_file *m, void *ignored) 661 { 662 struct drbd_device *device = m->private; 663 664 /* BUMP me if you change the file format/content/presentation */ 665 seq_printf(m, "v: %u\n\n", 0); 666 667 if (get_ldev_if_state(device, D_FAILED)) { 668 lc_seq_printf_stats(m, device->resync); 669 lc_seq_dump_details(m, device->resync, "rs_left flags", resync_dump_detail); 670 put_ldev(device); 671 } 672 return 0; 673 } 674 675 static int device_act_log_extents_show(struct seq_file *m, void *ignored) 676 { 677 struct drbd_device *device = m->private; 678 679 /* BUMP me if you change the file format/content/presentation */ 680 seq_printf(m, "v: %u\n\n", 0); 681 682 if (get_ldev_if_state(device, D_FAILED)) { 683 lc_seq_printf_stats(m, device->act_log); 684 lc_seq_dump_details(m, device->act_log, "", NULL); 685 put_ldev(device); 686 } 687 return 0; 688 } 689 690 static int device_oldest_requests_show(struct seq_file *m, void *ignored) 691 { 692 struct drbd_device *device = m->private; 693 struct drbd_resource *resource = device->resource; 694 unsigned long now = jiffies; 695 struct drbd_request *r1, *r2; 696 int i; 697 698 /* BUMP me if you change the file format/content/presentation */ 699 seq_printf(m, "v: %u\n\n", 0); 700 701 seq_puts(m, RQ_HDR); 702 spin_lock_irq(&resource->req_lock); 703 /* WRITE, then READ */ 704 for (i = 1; i >= 0; --i) { 705 r1 = list_first_entry_or_null(&device->pending_master_completion[i], 706 struct drbd_request, req_pending_master_completion); 707 r2 = list_first_entry_or_null(&device->pending_completion[i], 708 struct drbd_request, req_pending_local); 709 if (r1) 710 seq_print_one_request(m, r1, now); 711 if (r2 && r2 != r1) 712 seq_print_one_request(m, r2, now); 713 } 714 spin_unlock_irq(&resource->req_lock); 715 return 0; 716 } 717 718 static int device_data_gen_id_show(struct seq_file *m, void *ignored) 719 { 720 struct drbd_device *device = m->private; 721 struct drbd_md *md; 722 enum drbd_uuid_index idx; 723 724 if (!get_ldev_if_state(device, D_FAILED)) 725 return -ENODEV; 726 727 md = &device->ldev->md; 728 spin_lock_irq(&md->uuid_lock); 729 for (idx = UI_CURRENT; idx <= UI_HISTORY_END; idx++) { 730 seq_printf(m, "0x%016llX\n", md->uuid[idx]); 731 } 732 spin_unlock_irq(&md->uuid_lock); 733 put_ldev(device); 734 return 0; 735 } 736 737 static int device_ed_gen_id_show(struct seq_file *m, void *ignored) 738 { 739 struct drbd_device *device = m->private; 740 seq_printf(m, "0x%016llX\n", (unsigned long long)device->ed_uuid); 741 return 0; 742 } 743 744 #define drbd_debugfs_device_attr(name) \ 745 static int device_ ## name ## _open(struct inode *inode, struct file *file) \ 746 { \ 747 struct drbd_device *device = inode->i_private; \ 748 return drbd_single_open(file, device_ ## name ## _show, device, \ 749 &device->kref, drbd_destroy_device); \ 750 } \ 751 static int device_ ## name ## _release(struct inode *inode, struct file *file) \ 752 { \ 753 struct drbd_device *device = inode->i_private; \ 754 kref_put(&device->kref, drbd_destroy_device); \ 755 return single_release(inode, file); \ 756 } \ 757 static const struct file_operations device_ ## name ## _fops = { \ 758 .owner = THIS_MODULE, \ 759 .open = device_ ## name ## _open, \ 760 .read = seq_read, \ 761 .llseek = seq_lseek, \ 762 .release = device_ ## name ## _release, \ 763 }; 764 765 drbd_debugfs_device_attr(oldest_requests) 766 drbd_debugfs_device_attr(act_log_extents) 767 drbd_debugfs_device_attr(resync_extents) 768 drbd_debugfs_device_attr(data_gen_id) 769 drbd_debugfs_device_attr(ed_gen_id) 770 771 void drbd_debugfs_device_add(struct drbd_device *device) 772 { 773 struct dentry *vols_dir = device->resource->debugfs_res_volumes; 774 char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */ 775 char vnr_buf[8]; /* volume number vnr is even 16 bit only; */ 776 char *slink_name = NULL; 777 778 struct dentry *dentry; 779 if (!vols_dir || !drbd_debugfs_minors) 780 return; 781 782 snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr); 783 dentry = debugfs_create_dir(vnr_buf, vols_dir); 784 device->debugfs_vol = dentry; 785 786 snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor); 787 slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u", 788 device->resource->name, device->vnr); 789 if (!slink_name) 790 goto fail; 791 dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name); 792 device->debugfs_minor = dentry; 793 kfree(slink_name); 794 slink_name = NULL; 795 796 #define DCF(name) do { \ 797 dentry = debugfs_create_file(#name, 0440, \ 798 device->debugfs_vol, device, \ 799 &device_ ## name ## _fops); \ 800 device->debugfs_vol_ ## name = dentry; \ 801 } while (0) 802 803 DCF(oldest_requests); 804 DCF(act_log_extents); 805 DCF(resync_extents); 806 DCF(data_gen_id); 807 DCF(ed_gen_id); 808 #undef DCF 809 return; 810 811 fail: 812 drbd_debugfs_device_cleanup(device); 813 drbd_err(device, "failed to create debugfs entries\n"); 814 } 815 816 void drbd_debugfs_device_cleanup(struct drbd_device *device) 817 { 818 drbd_debugfs_remove(&device->debugfs_minor); 819 drbd_debugfs_remove(&device->debugfs_vol_oldest_requests); 820 drbd_debugfs_remove(&device->debugfs_vol_act_log_extents); 821 drbd_debugfs_remove(&device->debugfs_vol_resync_extents); 822 drbd_debugfs_remove(&device->debugfs_vol_data_gen_id); 823 drbd_debugfs_remove(&device->debugfs_vol_ed_gen_id); 824 drbd_debugfs_remove(&device->debugfs_vol); 825 } 826 827 void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device) 828 { 829 struct dentry *conn_dir = peer_device->connection->debugfs_conn; 830 struct dentry *dentry; 831 char vnr_buf[8]; 832 833 snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr); 834 dentry = debugfs_create_dir(vnr_buf, conn_dir); 835 peer_device->debugfs_peer_dev = dentry; 836 } 837 838 void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device) 839 { 840 drbd_debugfs_remove(&peer_device->debugfs_peer_dev); 841 } 842 843 static int drbd_version_show(struct seq_file *m, void *ignored) 844 { 845 seq_printf(m, "# %s\n", drbd_buildtag()); 846 seq_printf(m, "VERSION=%s\n", REL_VERSION); 847 seq_printf(m, "API_VERSION=%u\n", API_VERSION); 848 seq_printf(m, "PRO_VERSION_MIN=%u\n", PRO_VERSION_MIN); 849 seq_printf(m, "PRO_VERSION_MAX=%u\n", PRO_VERSION_MAX); 850 return 0; 851 } 852 853 static int drbd_version_open(struct inode *inode, struct file *file) 854 { 855 return single_open(file, drbd_version_show, NULL); 856 } 857 858 static const struct file_operations drbd_version_fops = { 859 .owner = THIS_MODULE, 860 .open = drbd_version_open, 861 .llseek = seq_lseek, 862 .read = seq_read, 863 .release = single_release, 864 }; 865 866 /* not __exit, may be indirectly called 867 * from the module-load-failure path as well. */ 868 void drbd_debugfs_cleanup(void) 869 { 870 drbd_debugfs_remove(&drbd_debugfs_resources); 871 drbd_debugfs_remove(&drbd_debugfs_minors); 872 drbd_debugfs_remove(&drbd_debugfs_version); 873 drbd_debugfs_remove(&drbd_debugfs_root); 874 } 875 876 void __init drbd_debugfs_init(void) 877 { 878 struct dentry *dentry; 879 880 dentry = debugfs_create_dir("drbd", NULL); 881 drbd_debugfs_root = dentry; 882 883 dentry = debugfs_create_file("version", 0444, drbd_debugfs_root, NULL, &drbd_version_fops); 884 drbd_debugfs_version = dentry; 885 886 dentry = debugfs_create_dir("resources", drbd_debugfs_root); 887 drbd_debugfs_resources = dentry; 888 889 dentry = debugfs_create_dir("minors", drbd_debugfs_root); 890 drbd_debugfs_minors = dentry; 891 } 892