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