drivers/block/drbd/drbd_debugfs.c

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