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