drbd_debugfs.c revision f0c21e622869b101da098db57d61aba737621402
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 19static struct dentry *drbd_debugfs_root; 20static struct dentry *drbd_debugfs_version; 21static struct dentry *drbd_debugfs_resources; 22static struct dentry *drbd_debugfs_minors; 23 24static 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 32static 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 46static 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 */ 53static 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 95static 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 121static 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 127static 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 155static 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 190static 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 215static 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 */ 229static 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"); 239 240 if (f & EE_IS_TRIM) { 241 seq_putc(m, sep); 242 sep = '|'; 243 if (f & EE_IS_TRIM_USE_ZEROOUT) 244 seq_puts(m, "zero-out"); 245 else 246 seq_puts(m, "trim"); 247 } 248 seq_putc(m, '\n'); 249} 250 251static void seq_print_peer_request(struct seq_file *m, 252 struct drbd_device *device, struct list_head *lh, 253 unsigned long now) 254{ 255 bool reported_preparing = false; 256 struct drbd_peer_request *peer_req; 257 list_for_each_entry(peer_req, lh, w.list) { 258 if (reported_preparing && !(peer_req->flags & EE_SUBMITTED)) 259 continue; 260 261 if (device) 262 seq_printf(m, "%u\t%u\t", device->minor, device->vnr); 263 264 seq_printf(m, "%llu\t%u\t%c\t%u\t", 265 (unsigned long long)peer_req->i.sector, peer_req->i.size >> 9, 266 (peer_req->flags & EE_WRITE) ? 'W' : 'R', 267 jiffies_to_msecs(now - peer_req->submit_jif)); 268 seq_print_peer_request_flags(m, peer_req); 269 if (peer_req->flags & EE_SUBMITTED) 270 break; 271 else 272 reported_preparing = true; 273 } 274} 275 276static void seq_print_device_peer_requests(struct seq_file *m, 277 struct drbd_device *device, unsigned long now) 278{ 279 seq_puts(m, "minor\tvnr\tsector\tsize\trw\tage\tflags\n"); 280 spin_lock_irq(&device->resource->req_lock); 281 seq_print_peer_request(m, device, &device->active_ee, now); 282 seq_print_peer_request(m, device, &device->read_ee, now); 283 seq_print_peer_request(m, device, &device->sync_ee, now); 284 spin_unlock_irq(&device->resource->req_lock); 285 if (test_bit(FLUSH_PENDING, &device->flags)) { 286 seq_printf(m, "%u\t%u\t-\t-\tF\t%u\tflush\n", 287 device->minor, device->vnr, 288 jiffies_to_msecs(now - device->flush_jif)); 289 } 290} 291 292static void seq_print_resource_pending_peer_requests(struct seq_file *m, 293 struct drbd_resource *resource, unsigned long now) 294{ 295 struct drbd_device *device; 296 unsigned int i; 297 298 rcu_read_lock(); 299 idr_for_each_entry(&resource->devices, device, i) { 300 seq_print_device_peer_requests(m, device, now); 301 } 302 rcu_read_unlock(); 303} 304 305static void seq_print_resource_transfer_log_summary(struct seq_file *m, 306 struct drbd_resource *resource, 307 struct drbd_connection *connection, 308 unsigned long now) 309{ 310 struct drbd_request *req; 311 unsigned int count = 0; 312 unsigned int show_state = 0; 313 314 seq_puts(m, "n\tdevice\tvnr\t" RQ_HDR); 315 spin_lock_irq(&resource->req_lock); 316 list_for_each_entry(req, &connection->transfer_log, tl_requests) { 317 unsigned int tmp = 0; 318 unsigned int s; 319 ++count; 320 321 /* don't disable irq "forever" */ 322 if (!(count & 0x1ff)) { 323 struct drbd_request *req_next; 324 kref_get(&req->kref); 325 spin_unlock_irq(&resource->req_lock); 326 cond_resched(); 327 spin_lock_irq(&resource->req_lock); 328 req_next = list_next_entry(req, tl_requests); 329 if (kref_put(&req->kref, drbd_req_destroy)) 330 req = req_next; 331 if (&req->tl_requests == &connection->transfer_log) 332 break; 333 } 334 335 s = req->rq_state; 336 337 /* This is meant to summarize timing issues, to be able to tell 338 * local disk problems from network problems. 339 * Skip requests, if we have shown an even older request with 340 * similar aspects already. */ 341 if (req->master_bio == NULL) 342 tmp |= 1; 343 if ((s & RQ_LOCAL_MASK) && (s & RQ_LOCAL_PENDING)) 344 tmp |= 2; 345 if (s & RQ_NET_MASK) { 346 if (!(s & RQ_NET_SENT)) 347 tmp |= 4; 348 if (s & RQ_NET_PENDING) 349 tmp |= 8; 350 if (!(s & RQ_NET_DONE)) 351 tmp |= 16; 352 } 353 if ((tmp & show_state) == tmp) 354 continue; 355 show_state |= tmp; 356 seq_printf(m, "%u\t", count); 357 seq_print_minor_vnr_req(m, req, now); 358 if (show_state == 0x1f) 359 break; 360 } 361 spin_unlock_irq(&resource->req_lock); 362} 363 364/* TODO: transfer_log and friends should be moved to resource */ 365static int in_flight_summary_show(struct seq_file *m, void *pos) 366{ 367 struct drbd_resource *resource = m->private; 368 struct drbd_connection *connection; 369 unsigned long jif = jiffies; 370 371 connection = first_connection(resource); 372 /* This does not happen, actually. 373 * But be robust and prepare for future code changes. */ 374 if (!connection || !kref_get_unless_zero(&connection->kref)) 375 return -ESTALE; 376 377 /* BUMP me if you change the file format/content/presentation */ 378 seq_printf(m, "v: %u\n\n", 0); 379 380 seq_puts(m, "oldest bitmap IO\n"); 381 seq_print_resource_pending_bitmap_io(m, resource, jif); 382 seq_putc(m, '\n'); 383 384 seq_puts(m, "meta data IO\n"); 385 seq_print_resource_pending_meta_io(m, resource, jif); 386 seq_putc(m, '\n'); 387 388 seq_puts(m, "socket buffer stats\n"); 389 /* for each connection ... once we have more than one */ 390 rcu_read_lock(); 391 if (connection->data.socket) { 392 /* open coded SIOCINQ, the "relevant" part */ 393 struct tcp_sock *tp = tcp_sk(connection->data.socket->sk); 394 int answ = tp->rcv_nxt - tp->copied_seq; 395 seq_printf(m, "unread receive buffer: %u Byte\n", answ); 396 /* open coded SIOCOUTQ, the "relevant" part */ 397 answ = tp->write_seq - tp->snd_una; 398 seq_printf(m, "unacked send buffer: %u Byte\n", answ); 399 } 400 rcu_read_unlock(); 401 seq_putc(m, '\n'); 402 403 seq_puts(m, "oldest peer requests\n"); 404 seq_print_resource_pending_peer_requests(m, resource, jif); 405 seq_putc(m, '\n'); 406 407 seq_puts(m, "application requests waiting for activity log\n"); 408 seq_print_waiting_for_AL(m, resource, jif); 409 seq_putc(m, '\n'); 410 411 seq_puts(m, "oldest application requests\n"); 412 seq_print_resource_transfer_log_summary(m, resource, connection, jif); 413 seq_putc(m, '\n'); 414 415 jif = jiffies - jif; 416 if (jif) 417 seq_printf(m, "generated in %d ms\n", jiffies_to_msecs(jif)); 418 kref_put(&connection->kref, drbd_destroy_connection); 419 return 0; 420} 421 422/* simple_positive(file->f_dentry) respectively debugfs_positive(), 423 * but neither is "reachable" from here. 424 * So we have our own inline version of it above. :-( */ 425static inline int debugfs_positive(struct dentry *dentry) 426{ 427 return dentry->d_inode && !d_unhashed(dentry); 428} 429 430/* make sure at *open* time that the respective object won't go away. */ 431static int drbd_single_open(struct file *file, int (*show)(struct seq_file *, void *), 432 void *data, struct kref *kref, 433 void (*release)(struct kref *)) 434{ 435 struct dentry *parent; 436 int ret = -ESTALE; 437 438 /* Are we still linked, 439 * or has debugfs_remove() already been called? */ 440 parent = file->f_dentry->d_parent; 441 /* not sure if this can happen: */ 442 if (!parent || !parent->d_inode) 443 goto out; 444 /* serialize with d_delete() */ 445 mutex_lock(&parent->d_inode->i_mutex); 446 /* Make sure the object is still alive */ 447 if (debugfs_positive(file->f_dentry) 448 && kref_get_unless_zero(kref)) 449 ret = 0; 450 mutex_unlock(&parent->d_inode->i_mutex); 451 if (!ret) { 452 ret = single_open(file, show, data); 453 if (ret) 454 kref_put(kref, release); 455 } 456out: 457 return ret; 458} 459 460static int in_flight_summary_open(struct inode *inode, struct file *file) 461{ 462 struct drbd_resource *resource = inode->i_private; 463 return drbd_single_open(file, in_flight_summary_show, resource, 464 &resource->kref, drbd_destroy_resource); 465} 466 467static int in_flight_summary_release(struct inode *inode, struct file *file) 468{ 469 struct drbd_resource *resource = inode->i_private; 470 kref_put(&resource->kref, drbd_destroy_resource); 471 return single_release(inode, file); 472} 473 474static const struct file_operations in_flight_summary_fops = { 475 .owner = THIS_MODULE, 476 .open = in_flight_summary_open, 477 .read = seq_read, 478 .llseek = seq_lseek, 479 .release = in_flight_summary_release, 480}; 481 482void drbd_debugfs_resource_add(struct drbd_resource *resource) 483{ 484 struct dentry *dentry; 485 if (!drbd_debugfs_resources) 486 return; 487 488 dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources); 489 if (IS_ERR_OR_NULL(dentry)) 490 goto fail; 491 resource->debugfs_res = dentry; 492 493 dentry = debugfs_create_dir("volumes", resource->debugfs_res); 494 if (IS_ERR_OR_NULL(dentry)) 495 goto fail; 496 resource->debugfs_res_volumes = dentry; 497 498 dentry = debugfs_create_dir("connections", resource->debugfs_res); 499 if (IS_ERR_OR_NULL(dentry)) 500 goto fail; 501 resource->debugfs_res_connections = dentry; 502 503 dentry = debugfs_create_file("in_flight_summary", S_IRUSR|S_IRGRP, 504 resource->debugfs_res, resource, 505 &in_flight_summary_fops); 506 if (IS_ERR_OR_NULL(dentry)) 507 goto fail; 508 resource->debugfs_res_in_flight_summary = dentry; 509 return; 510 511fail: 512 drbd_debugfs_resource_cleanup(resource); 513 drbd_err(resource, "failed to create debugfs dentry\n"); 514} 515 516static void drbd_debugfs_remove(struct dentry **dp) 517{ 518 debugfs_remove(*dp); 519 *dp = NULL; 520} 521 522void drbd_debugfs_resource_cleanup(struct drbd_resource *resource) 523{ 524 /* it is ok to call debugfs_remove(NULL) */ 525 drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary); 526 drbd_debugfs_remove(&resource->debugfs_res_connections); 527 drbd_debugfs_remove(&resource->debugfs_res_volumes); 528 drbd_debugfs_remove(&resource->debugfs_res); 529} 530 531static void seq_print_one_timing_detail(struct seq_file *m, 532 const struct drbd_thread_timing_details *tdp, 533 unsigned long now) 534{ 535 struct drbd_thread_timing_details td; 536 /* No locking... 537 * use temporary assignment to get at consistent data. */ 538 do { 539 td = *tdp; 540 } while (td.cb_nr != tdp->cb_nr); 541 if (!td.cb_addr) 542 return; 543 seq_printf(m, "%u\t%d\t%s:%u\t%ps\n", 544 td.cb_nr, 545 jiffies_to_msecs(now - td.start_jif), 546 td.caller_fn, td.line, 547 td.cb_addr); 548} 549 550static void seq_print_timing_details(struct seq_file *m, 551 const char *title, 552 unsigned int cb_nr, struct drbd_thread_timing_details *tdp, unsigned long now) 553{ 554 unsigned int start_idx; 555 unsigned int i; 556 557 seq_printf(m, "%s\n", title); 558 /* If not much is going on, this will result in natural ordering. 559 * If it is very busy, we will possibly skip events, or even see wrap 560 * arounds, which could only be avoided with locking. 561 */ 562 start_idx = cb_nr % DRBD_THREAD_DETAILS_HIST; 563 for (i = start_idx; i < DRBD_THREAD_DETAILS_HIST; i++) 564 seq_print_one_timing_detail(m, tdp+i, now); 565 for (i = 0; i < start_idx; i++) 566 seq_print_one_timing_detail(m, tdp+i, now); 567} 568 569static int callback_history_show(struct seq_file *m, void *ignored) 570{ 571 struct drbd_connection *connection = m->private; 572 unsigned long jif = jiffies; 573 574 /* BUMP me if you change the file format/content/presentation */ 575 seq_printf(m, "v: %u\n\n", 0); 576 577 seq_puts(m, "n\tage\tcallsite\tfn\n"); 578 seq_print_timing_details(m, "worker", connection->w_cb_nr, connection->w_timing_details, jif); 579 seq_print_timing_details(m, "receiver", connection->r_cb_nr, connection->r_timing_details, jif); 580 return 0; 581} 582 583static int callback_history_open(struct inode *inode, struct file *file) 584{ 585 struct drbd_connection *connection = inode->i_private; 586 return drbd_single_open(file, callback_history_show, connection, 587 &connection->kref, drbd_destroy_connection); 588} 589 590static int callback_history_release(struct inode *inode, struct file *file) 591{ 592 struct drbd_connection *connection = inode->i_private; 593 kref_put(&connection->kref, drbd_destroy_connection); 594 return single_release(inode, file); 595} 596 597static const struct file_operations connection_callback_history_fops = { 598 .owner = THIS_MODULE, 599 .open = callback_history_open, 600 .read = seq_read, 601 .llseek = seq_lseek, 602 .release = callback_history_release, 603}; 604 605static int connection_oldest_requests_show(struct seq_file *m, void *ignored) 606{ 607 struct drbd_connection *connection = m->private; 608 unsigned long now = jiffies; 609 struct drbd_request *r1, *r2; 610 611 /* BUMP me if you change the file format/content/presentation */ 612 seq_printf(m, "v: %u\n\n", 0); 613 614 spin_lock_irq(&connection->resource->req_lock); 615 r1 = connection->req_next; 616 if (r1) 617 seq_print_minor_vnr_req(m, r1, now); 618 r2 = connection->req_ack_pending; 619 if (r2 && r2 != r1) { 620 r1 = r2; 621 seq_print_minor_vnr_req(m, r1, now); 622 } 623 r2 = connection->req_not_net_done; 624 if (r2 && r2 != r1) 625 seq_print_minor_vnr_req(m, r2, now); 626 spin_unlock_irq(&connection->resource->req_lock); 627 return 0; 628} 629 630static int connection_oldest_requests_open(struct inode *inode, struct file *file) 631{ 632 struct drbd_connection *connection = inode->i_private; 633 return drbd_single_open(file, connection_oldest_requests_show, connection, 634 &connection->kref, drbd_destroy_connection); 635} 636 637static int connection_oldest_requests_release(struct inode *inode, struct file *file) 638{ 639 struct drbd_connection *connection = inode->i_private; 640 kref_put(&connection->kref, drbd_destroy_connection); 641 return single_release(inode, file); 642} 643 644static const struct file_operations connection_oldest_requests_fops = { 645 .owner = THIS_MODULE, 646 .open = connection_oldest_requests_open, 647 .read = seq_read, 648 .llseek = seq_lseek, 649 .release = connection_oldest_requests_release, 650}; 651 652void drbd_debugfs_connection_add(struct drbd_connection *connection) 653{ 654 struct dentry *conns_dir = connection->resource->debugfs_res_connections; 655 struct dentry *dentry; 656 if (!conns_dir) 657 return; 658 659 /* Once we enable mutliple peers, 660 * these connections will have descriptive names. 661 * For now, it is just the one connection to the (only) "peer". */ 662 dentry = debugfs_create_dir("peer", conns_dir); 663 if (IS_ERR_OR_NULL(dentry)) 664 goto fail; 665 connection->debugfs_conn = dentry; 666 667 dentry = debugfs_create_file("callback_history", S_IRUSR|S_IRGRP, 668 connection->debugfs_conn, connection, 669 &connection_callback_history_fops); 670 if (IS_ERR_OR_NULL(dentry)) 671 goto fail; 672 connection->debugfs_conn_callback_history = dentry; 673 674 dentry = debugfs_create_file("oldest_requests", S_IRUSR|S_IRGRP, 675 connection->debugfs_conn, connection, 676 &connection_oldest_requests_fops); 677 if (IS_ERR_OR_NULL(dentry)) 678 goto fail; 679 connection->debugfs_conn_oldest_requests = dentry; 680 return; 681 682fail: 683 drbd_debugfs_connection_cleanup(connection); 684 drbd_err(connection, "failed to create debugfs dentry\n"); 685} 686 687void drbd_debugfs_connection_cleanup(struct drbd_connection *connection) 688{ 689 drbd_debugfs_remove(&connection->debugfs_conn_callback_history); 690 drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests); 691 drbd_debugfs_remove(&connection->debugfs_conn); 692} 693 694static void resync_dump_detail(struct seq_file *m, struct lc_element *e) 695{ 696 struct bm_extent *bme = lc_entry(e, struct bm_extent, lce); 697 698 seq_printf(m, "%5d %s %s %s", bme->rs_left, 699 test_bit(BME_NO_WRITES, &bme->flags) ? "NO_WRITES" : "---------", 700 test_bit(BME_LOCKED, &bme->flags) ? "LOCKED" : "------", 701 test_bit(BME_PRIORITY, &bme->flags) ? "PRIORITY" : "--------" 702 ); 703} 704 705static int device_resync_extents_show(struct seq_file *m, void *ignored) 706{ 707 struct drbd_device *device = m->private; 708 709 /* BUMP me if you change the file format/content/presentation */ 710 seq_printf(m, "v: %u\n\n", 0); 711 712 if (get_ldev_if_state(device, D_FAILED)) { 713 lc_seq_printf_stats(m, device->resync); 714 lc_seq_dump_details(m, device->resync, "rs_left flags", resync_dump_detail); 715 put_ldev(device); 716 } 717 return 0; 718} 719 720static int device_act_log_extents_show(struct seq_file *m, void *ignored) 721{ 722 struct drbd_device *device = m->private; 723 724 /* BUMP me if you change the file format/content/presentation */ 725 seq_printf(m, "v: %u\n\n", 0); 726 727 if (get_ldev_if_state(device, D_FAILED)) { 728 lc_seq_printf_stats(m, device->act_log); 729 lc_seq_dump_details(m, device->act_log, "", NULL); 730 put_ldev(device); 731 } 732 return 0; 733} 734 735static int device_oldest_requests_show(struct seq_file *m, void *ignored) 736{ 737 struct drbd_device *device = m->private; 738 struct drbd_resource *resource = device->resource; 739 unsigned long now = jiffies; 740 struct drbd_request *r1, *r2; 741 int i; 742 743 /* BUMP me if you change the file format/content/presentation */ 744 seq_printf(m, "v: %u\n\n", 0); 745 746 seq_puts(m, RQ_HDR); 747 spin_lock_irq(&resource->req_lock); 748 /* WRITE, then READ */ 749 for (i = 1; i >= 0; --i) { 750 r1 = list_first_entry_or_null(&device->pending_master_completion[i], 751 struct drbd_request, req_pending_master_completion); 752 r2 = list_first_entry_or_null(&device->pending_completion[i], 753 struct drbd_request, req_pending_local); 754 if (r1) 755 seq_print_one_request(m, r1, now); 756 if (r2 && r2 != r1) 757 seq_print_one_request(m, r2, now); 758 } 759 spin_unlock_irq(&resource->req_lock); 760 return 0; 761} 762 763static int device_data_gen_id_show(struct seq_file *m, void *ignored) 764{ 765 struct drbd_device *device = m->private; 766 struct drbd_md *md; 767 enum drbd_uuid_index idx; 768 769 if (!get_ldev_if_state(device, D_FAILED)) 770 return -ENODEV; 771 772 md = &device->ldev->md; 773 spin_lock_irq(&md->uuid_lock); 774 for (idx = UI_CURRENT; idx <= UI_HISTORY_END; idx++) { 775 seq_printf(m, "0x%016llX\n", md->uuid[idx]); 776 } 777 spin_unlock_irq(&md->uuid_lock); 778 put_ldev(device); 779 return 0; 780} 781 782#define drbd_debugfs_device_attr(name) \ 783static int device_ ## name ## _open(struct inode *inode, struct file *file) \ 784{ \ 785 struct drbd_device *device = inode->i_private; \ 786 return drbd_single_open(file, device_ ## name ## _show, device, \ 787 &device->kref, drbd_destroy_device); \ 788} \ 789static int device_ ## name ## _release(struct inode *inode, struct file *file) \ 790{ \ 791 struct drbd_device *device = inode->i_private; \ 792 kref_put(&device->kref, drbd_destroy_device); \ 793 return single_release(inode, file); \ 794} \ 795static const struct file_operations device_ ## name ## _fops = { \ 796 .owner = THIS_MODULE, \ 797 .open = device_ ## name ## _open, \ 798 .read = seq_read, \ 799 .llseek = seq_lseek, \ 800 .release = device_ ## name ## _release, \ 801}; 802 803drbd_debugfs_device_attr(oldest_requests) 804drbd_debugfs_device_attr(act_log_extents) 805drbd_debugfs_device_attr(resync_extents) 806drbd_debugfs_device_attr(data_gen_id) 807 808void drbd_debugfs_device_add(struct drbd_device *device) 809{ 810 struct dentry *vols_dir = device->resource->debugfs_res_volumes; 811 char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */ 812 char vnr_buf[8]; /* volume number vnr is even 16 bit only; */ 813 char *slink_name = NULL; 814 815 struct dentry *dentry; 816 if (!vols_dir || !drbd_debugfs_minors) 817 return; 818 819 snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr); 820 dentry = debugfs_create_dir(vnr_buf, vols_dir); 821 if (IS_ERR_OR_NULL(dentry)) 822 goto fail; 823 device->debugfs_vol = dentry; 824 825 snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor); 826 slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u", 827 device->resource->name, device->vnr); 828 if (!slink_name) 829 goto fail; 830 dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name); 831 kfree(slink_name); 832 slink_name = NULL; 833 if (IS_ERR_OR_NULL(dentry)) 834 goto fail; 835 device->debugfs_minor = dentry; 836 837#define DCF(name) do { \ 838 dentry = debugfs_create_file(#name, S_IRUSR|S_IRGRP, \ 839 device->debugfs_vol, device, \ 840 &device_ ## name ## _fops); \ 841 if (IS_ERR_OR_NULL(dentry)) \ 842 goto fail; \ 843 device->debugfs_vol_ ## name = dentry; \ 844 } while (0) 845 846 DCF(oldest_requests); 847 DCF(act_log_extents); 848 DCF(resync_extents); 849 DCF(data_gen_id); 850#undef DCF 851 return; 852 853fail: 854 drbd_debugfs_device_cleanup(device); 855 drbd_err(device, "failed to create debugfs entries\n"); 856} 857 858void drbd_debugfs_device_cleanup(struct drbd_device *device) 859{ 860 drbd_debugfs_remove(&device->debugfs_minor); 861 drbd_debugfs_remove(&device->debugfs_vol_oldest_requests); 862 drbd_debugfs_remove(&device->debugfs_vol_act_log_extents); 863 drbd_debugfs_remove(&device->debugfs_vol_resync_extents); 864 drbd_debugfs_remove(&device->debugfs_vol_data_gen_id); 865 drbd_debugfs_remove(&device->debugfs_vol); 866} 867 868void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device) 869{ 870 struct dentry *conn_dir = peer_device->connection->debugfs_conn; 871 struct dentry *dentry; 872 char vnr_buf[8]; 873 874 if (!conn_dir) 875 return; 876 877 snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr); 878 dentry = debugfs_create_dir(vnr_buf, conn_dir); 879 if (IS_ERR_OR_NULL(dentry)) 880 goto fail; 881 peer_device->debugfs_peer_dev = dentry; 882 return; 883 884fail: 885 drbd_debugfs_peer_device_cleanup(peer_device); 886 drbd_err(peer_device, "failed to create debugfs entries\n"); 887} 888 889void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device) 890{ 891 drbd_debugfs_remove(&peer_device->debugfs_peer_dev); 892} 893 894static int drbd_version_show(struct seq_file *m, void *ignored) 895{ 896 seq_printf(m, "# %s\n", drbd_buildtag()); 897 seq_printf(m, "VERSION=%s\n", REL_VERSION); 898 seq_printf(m, "API_VERSION=%u\n", API_VERSION); 899 seq_printf(m, "PRO_VERSION_MIN=%u\n", PRO_VERSION_MIN); 900 seq_printf(m, "PRO_VERSION_MAX=%u\n", PRO_VERSION_MAX); 901 return 0; 902} 903 904static int drbd_version_open(struct inode *inode, struct file *file) 905{ 906 return single_open(file, drbd_version_show, NULL); 907} 908 909static struct file_operations drbd_version_fops = { 910 .owner = THIS_MODULE, 911 .open = drbd_version_open, 912 .llseek = seq_lseek, 913 .read = seq_read, 914 .release = single_release, 915}; 916 917/* not __exit, may be indirectly called 918 * from the module-load-failure path as well. */ 919void drbd_debugfs_cleanup(void) 920{ 921 drbd_debugfs_remove(&drbd_debugfs_resources); 922 drbd_debugfs_remove(&drbd_debugfs_minors); 923 drbd_debugfs_remove(&drbd_debugfs_version); 924 drbd_debugfs_remove(&drbd_debugfs_root); 925} 926 927int __init drbd_debugfs_init(void) 928{ 929 struct dentry *dentry; 930 931 dentry = debugfs_create_dir("drbd", NULL); 932 if (IS_ERR_OR_NULL(dentry)) 933 goto fail; 934 drbd_debugfs_root = dentry; 935 936 dentry = debugfs_create_file("version", 0444, drbd_debugfs_root, NULL, &drbd_version_fops); 937 if (IS_ERR_OR_NULL(dentry)) 938 goto fail; 939 drbd_debugfs_version = dentry; 940 941 dentry = debugfs_create_dir("resources", drbd_debugfs_root); 942 if (IS_ERR_OR_NULL(dentry)) 943 goto fail; 944 drbd_debugfs_resources = dentry; 945 946 dentry = debugfs_create_dir("minors", drbd_debugfs_root); 947 if (IS_ERR_OR_NULL(dentry)) 948 goto fail; 949 drbd_debugfs_minors = dentry; 950 return 0; 951 952fail: 953 drbd_debugfs_cleanup(); 954 if (dentry) 955 return PTR_ERR(dentry); 956 else 957 return -EINVAL; 958} 959