drivers/block/drbd/drbd_debugfs.c

   1 #define pr_fmt(fmt) "drbd debugfs: " fmt
   2 #include <linux/kernel.h>
   3 #include <linux/module.h>
   4 #include <linux/debugfs.h>
   5 #include <linux/seq_file.h>
   6 #include <linux/stat.h>
   7 #include <linux/jiffies.h>
   8 #include <linux/list.h>
   9
  10 #include "drbd_int.h"
  11 #include "drbd_req.h"
  12 #include "drbd_debugfs.h"
  13
  14
  15 /**********************************************************************
  16  * Whenever you change the file format, remember to bump the version. *
  17  **********************************************************************/
  18
  19 static struct dentry *drbd_debugfs_root;
  20 static struct dentry *drbd_debugfs_version;
  21 static struct dentry *drbd_debugfs_resources;
  22 static struct dentry *drbd_debugfs_minors;
  23
  24 static void seq_print_age_or_dash(struct seq_file *m, bool valid, unsigned long dt)
  25 {
  26         if (valid)
  27                 seq_printf(m, "\t%d", jiffies_to_msecs(dt));
  28         else
  29                 seq_printf(m, "\t-");
  30 }
  31
  32 static void __seq_print_rq_state_bit(struct seq_file *m,
  33         bool is_set, char *sep, const char *set_name, const char *unset_name)
  34 {
  35         if (is_set && set_name) {
  36                 seq_putc(m, *sep);
  37                 seq_puts(m, set_name);
  38                 *sep = '|';
  39         } else if (!is_set && unset_name) {
  40                 seq_putc(m, *sep);
  41                 seq_puts(m, unset_name);
  42                 *sep = '|';
  43         }
  44 }
  45
  46 static void seq_print_rq_state_bit(struct seq_file *m,
  47         bool is_set, char *sep, const char *set_name)
  48 {
  49         __seq_print_rq_state_bit(m, is_set, sep, set_name, NULL);
  50 }
  51
  52 /* pretty print enum drbd_req_state_bits req->rq_state */
  53 static void seq_print_request_state(struct seq_file *m, struct drbd_request *req)
  54 {
  55         unsigned int s = req->rq_state;
  56         char sep = ' ';
  57         seq_printf(m, "\t0x%08x", s);
  58         seq_printf(m, "\tmaster: %s", req->master_bio ? "pending" : "completed");
  59
  60         /* RQ_WRITE ignored, already reported */
  61         seq_puts(m, "\tlocal:");
  62         seq_print_rq_state_bit(m, s & RQ_IN_ACT_LOG, &sep, "in-AL");
  63         seq_print_rq_state_bit(m, s & RQ_POSTPONED, &sep, "postponed");
  64         seq_print_rq_state_bit(m, s & RQ_COMPLETION_SUSP, &sep, "suspended");
  65         sep = ' ';
  66         seq_print_rq_state_bit(m, s & RQ_LOCAL_PENDING, &sep, "pending");
  67         seq_print_rq_state_bit(m, s & RQ_LOCAL_COMPLETED, &sep, "completed");
  68         seq_print_rq_state_bit(m, s & RQ_LOCAL_ABORTED, &sep, "aborted");
  69         seq_print_rq_state_bit(m, s & RQ_LOCAL_OK, &sep, "ok");
  70         if (sep == ' ')
  71                 seq_puts(m, " -");
  72
  73         /* for_each_connection ... */
  74         seq_printf(m, "\tnet:");
  75         sep = ' ';
  76         seq_print_rq_state_bit(m, s & RQ_NET_PENDING, &sep, "pending");
  77         seq_print_rq_state_bit(m, s & RQ_NET_QUEUED, &sep, "queued");
  78         seq_print_rq_state_bit(m, s & RQ_NET_SENT, &sep, "sent");
  79         seq_print_rq_state_bit(m, s & RQ_NET_DONE, &sep, "done");
  80         seq_print_rq_state_bit(m, s & RQ_NET_SIS, &sep, "sis");
  81         seq_print_rq_state_bit(m, s & RQ_NET_OK, &sep, "ok");
  82         if (sep == ' ')
  83                 seq_puts(m, " -");
  84
  85         seq_printf(m, " :");
  86         sep = ' ';
  87         seq_print_rq_state_bit(m, s & RQ_EXP_RECEIVE_ACK, &sep, "B");
  88         seq_print_rq_state_bit(m, s & RQ_EXP_WRITE_ACK, &sep, "C");
  89         seq_print_rq_state_bit(m, s & RQ_EXP_BARR_ACK, &sep, "barr");
  90         if (sep == ' ')
  91                 seq_puts(m, " -");
  92         seq_printf(m, "\n");
  93 }
  94
  95 static void seq_print_one_request(struct seq_file *m, struct drbd_request *req, unsigned long now)
  96 {
  97         /* change anything here, fixup header below! */
  98         unsigned int s = req->rq_state;
  99
 100 #define RQ_HDR_1 "epoch\tsector\tsize\trw"
 101         seq_printf(m, "0x%x\t%llu\t%u\t%s",
 102                 req->epoch,
 103                 (unsigned long long)req->i.sector, req->i.size >> 9,
 104                 (s & RQ_WRITE) ? "W" : "R");
 105
 106 #define RQ_HDR_2 "\tstart\tin AL\tsubmit"
 107         seq_printf(m, "\t%d", jiffies_to_msecs(now - req->start_jif));
 108         seq_print_age_or_dash(m, s & RQ_IN_ACT_LOG, now - req->in_actlog_jif);
 109         seq_print_age_or_dash(m, s & RQ_LOCAL_PENDING, now - req->pre_submit_jif);
 110
 111 #define RQ_HDR_3 "\tsent\tacked\tdone"
 112         seq_print_age_or_dash(m, s & RQ_NET_SENT, now - req->pre_send_jif);
 113         seq_print_age_or_dash(m, (s & RQ_NET_SENT) && !(s & RQ_NET_PENDING), now - req->acked_jif);
 114         seq_print_age_or_dash(m, s & RQ_NET_DONE, now - req->net_done_jif);
 115
 116 #define RQ_HDR_4 "\tstate\n"
 117         seq_print_request_state(m, req);
 118 }
 119 #define RQ_HDR RQ_HDR_1 RQ_HDR_2 RQ_HDR_3 RQ_HDR_4
 120
 121 static void seq_print_minor_vnr_req(struct seq_file *m, struct drbd_request *req, unsigned long now)
 122 {
 123         seq_printf(m, "%u\t%u\t", req->device->minor, req->device->vnr);
 124         seq_print_one_request(m, req, now);
 125 }
 126
 127 static void seq_print_resource_pending_meta_io(struct seq_file *m, struct drbd_resource *resource, unsigned long now)
 128 {
 129         struct drbd_device *device;
 130         unsigned int i;
 131
 132         seq_puts(m, "minor\tvnr\tstart\tsubmit\tintent\n");
 133         rcu_read_lock();
 134         idr_for_each_entry(&resource->devices, device, i) {
 135                 struct drbd_md_io tmp;
 136                 /* In theory this is racy,
 137                  * in the sense that there could have been a
 138                  * drbd_md_put_buffer(); drbd_md_get_buffer();
 139                  * between accessing these members here.  */
 140                 tmp = device->md_io;
 141                 if (atomic_read(&tmp.in_use)) {
 142                         seq_printf(m, "%u\t%u\t%d\t",
 143                                 device->minor, device->vnr,
 144                                 jiffies_to_msecs(now - tmp.start_jif));
 145                         if (time_before(tmp.submit_jif, tmp.start_jif))
 146                                 seq_puts(m, "-\t");
 147                         else
 148                                 seq_printf(m, "%d\t", jiffies_to_msecs(now - tmp.submit_jif));
 149                         seq_printf(m, "%s\n", tmp.current_use);
 150                 }
 151         }
 152         rcu_read_unlock();
 153 }
 154
 155 static void seq_print_waiting_for_AL(struct seq_file *m, struct drbd_resource *resource, unsigned long now)
 156 {
 157         struct drbd_device *device;
 158         unsigned int i;
 159
 160         seq_puts(m, "minor\tvnr\tage\t#waiting\n");
 161         rcu_read_lock();
 162         idr_for_each_entry(&resource->devices, device, i) {
 163                 unsigned long jif;
 164                 struct drbd_request *req;
 165                 int n = atomic_read(&device->ap_actlog_cnt);
 166                 if (n) {
 167                         spin_lock_irq(&device->resource->req_lock);
 168                         req = list_first_entry_or_null(&device->pending_master_completion[1],
 169                                 struct drbd_request, req_pending_master_completion);
 170                         /* if the oldest request does not wait for the activity log
 171                          * it is not interesting for us here */
 172                         if (req && !(req->rq_state & RQ_IN_ACT_LOG))
 173                                 jif = req->start_jif;
 174                         else
 175                                 req = NULL;
 176                         spin_unlock_irq(&device->resource->req_lock);
 177                 }
 178                 if (n) {
 179                         seq_printf(m, "%u\t%u\t", device->minor, device->vnr);
 180                         if (req)
 181                                 seq_printf(m, "%u\t", jiffies_to_msecs(now - jif));
 182                         else
 183                                 seq_puts(m, "-\t");
 184                         seq_printf(m, "%u\n", n);
 185                 }
 186         }
 187         rcu_read_unlock();
 188 }
 189
 190 static void seq_print_device_bitmap_io(struct seq_file *m, struct drbd_device *device, unsigned long now)
 191 {
 192         struct drbd_bm_aio_ctx *ctx;
 193         unsigned long start_jif;
 194         unsigned int in_flight;
 195         unsigned int flags;
 196         spin_lock_irq(&device->resource->req_lock);
 197         ctx = list_first_entry_or_null(&device->pending_bitmap_io, struct drbd_bm_aio_ctx, list);
 198         if (ctx && ctx->done)
 199                 ctx = NULL;
 200         if (ctx) {
 201                 start_jif = ctx->start_jif;
 202                 in_flight = atomic_read(&ctx->in_flight);
 203                 flags = ctx->flags;
 204         }
 205         spin_unlock_irq(&device->resource->req_lock);
 206         if (ctx) {
 207                 seq_printf(m, "%u\t%u\t%c\t%u\t%u\n",
 208                         device->minor, device->vnr,
 209                         (flags & BM_AIO_READ) ? 'R' : 'W',
 210                         jiffies_to_msecs(now - start_jif),
 211                         in_flight);
 212         }
 213 }
 214
 215 static void seq_print_resource_pending_bitmap_io(struct seq_file *m, struct drbd_resource *resource, unsigned long now)
 216 {
 217         struct drbd_device *device;
 218         unsigned int i;
 219
 220         seq_puts(m, "minor\tvnr\trw\tage\t#in-flight\n");
 221         rcu_read_lock();
 222         idr_for_each_entry(&resource->devices, device, i) {
 223                 seq_print_device_bitmap_io(m, device, now);
 224         }
 225         rcu_read_unlock();
 226 }
 227
 228 /* pretty print enum peer_req->flags */
 229 static void seq_print_peer_request_flags(struct seq_file *m, struct drbd_peer_request *peer_req)
 230 {
 231         unsigned long f = peer_req->flags;
 232         char sep = ' ';
 233
 234         __seq_print_rq_state_bit(m, f & EE_SUBMITTED, &sep, "submitted", "preparing");
 235         __seq_print_rq_state_bit(m, f & EE_APPLICATION, &sep, "application", "internal");
 236         seq_print_rq_state_bit(m, f & EE_CALL_AL_COMPLETE_IO, &sep, "in-AL");
 237         seq_print_rq_state_bit(m, f & EE_SEND_WRITE_ACK, &sep, "C");
 238         seq_print_rq_state_bit(m, f & EE_MAY_SET_IN_SYNC, &sep, "set-in-sync");
 239
 240         if (f & EE_IS_TRIM)
 241                 __seq_print_rq_state_bit(m, f & EE_IS_TRIM_USE_ZEROOUT, &sep, "zero-out", "trim");
 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         /* not sure if this can happen: */
 429         if (!parent || d_really_is_negative(parent))
 430                 goto out;
 431         /* serialize with d_delete() */
 432         inode_lock(d_inode(parent));
 433         /* Make sure the object is still alive */
 434         if (simple_positive(file->f_path.dentry)
 435         && kref_get_unless_zero(kref))
 436                 ret = 0;
 437         inode_unlock(d_inode(parent));
 438         if (!ret) {
 439                 ret = single_open(file, show, data);
 440                 if (ret)
 441                         kref_put(kref, release);
 442         }
 443 out:
 444         return ret;
 445 }
 446
 447 static int in_flight_summary_open(struct inode *inode, struct file *file)
 448 {
 449         struct drbd_resource *resource = inode->i_private;
 450         return drbd_single_open(file, in_flight_summary_show, resource,
 451                                 &resource->kref, drbd_destroy_resource);
 452 }
 453
 454 static int in_flight_summary_release(struct inode *inode, struct file *file)
 455 {
 456         struct drbd_resource *resource = inode->i_private;
 457         kref_put(&resource->kref, drbd_destroy_resource);
 458         return single_release(inode, file);
 459 }
 460
 461 static const struct file_operations in_flight_summary_fops = {
 462         .owner          = THIS_MODULE,
 463         .open           = in_flight_summary_open,
 464         .read           = seq_read,
 465         .llseek         = seq_lseek,
 466         .release        = in_flight_summary_release,
 467 };
 468
 469 void drbd_debugfs_resource_add(struct drbd_resource *resource)
 470 {
 471         struct dentry *dentry;
 472         if (!drbd_debugfs_resources)
 473                 return;
 474
 475         dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources);
 476         if (IS_ERR_OR_NULL(dentry))
 477                 goto fail;
 478         resource->debugfs_res = dentry;
 479
 480         dentry = debugfs_create_dir("volumes", resource->debugfs_res);
 481         if (IS_ERR_OR_NULL(dentry))
 482                 goto fail;
 483         resource->debugfs_res_volumes = dentry;
 484
 485         dentry = debugfs_create_dir("connections", resource->debugfs_res);
 486         if (IS_ERR_OR_NULL(dentry))
 487                 goto fail;
 488         resource->debugfs_res_connections = dentry;
 489
 490         dentry = debugfs_create_file("in_flight_summary", S_IRUSR|S_IRGRP,
 491                         resource->debugfs_res, resource,
 492                         &in_flight_summary_fops);
 493         if (IS_ERR_OR_NULL(dentry))
 494                 goto fail;
 495         resource->debugfs_res_in_flight_summary = dentry;
 496         return;
 497
 498 fail:
 499         drbd_debugfs_resource_cleanup(resource);
 500         drbd_err(resource, "failed to create debugfs dentry\n");
 501 }
 502
 503 static void drbd_debugfs_remove(struct dentry **dp)
 504 {
 505         debugfs_remove(*dp);
 506         *dp = NULL;
 507 }
 508
 509 void drbd_debugfs_resource_cleanup(struct drbd_resource *resource)
 510 {
 511         /* it is ok to call debugfs_remove(NULL) */
 512         drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary);
 513         drbd_debugfs_remove(&resource->debugfs_res_connections);
 514         drbd_debugfs_remove(&resource->debugfs_res_volumes);
 515         drbd_debugfs_remove(&resource->debugfs_res);
 516 }
 517
 518 static void seq_print_one_timing_detail(struct seq_file *m,
 519         const struct drbd_thread_timing_details *tdp,
 520         unsigned long now)
 521 {
 522         struct drbd_thread_timing_details td;
 523         /* No locking...
 524          * use temporary assignment to get at consistent data. */
 525         do {
 526                 td = *tdp;
 527         } while (td.cb_nr != tdp->cb_nr);
 528         if (!td.cb_addr)
 529                 return;
 530         seq_printf(m, "%u\t%d\t%s:%u\t%ps\n",
 531                         td.cb_nr,
 532                         jiffies_to_msecs(now - td.start_jif),
 533                         td.caller_fn, td.line,
 534                         td.cb_addr);
 535 }
 536
 537 static void seq_print_timing_details(struct seq_file *m,
 538                 const char *title,
 539                 unsigned int cb_nr, struct drbd_thread_timing_details *tdp, unsigned long now)
 540 {
 541         unsigned int start_idx;
 542         unsigned int i;
 543
 544         seq_printf(m, "%s\n", title);
 545         /* If not much is going on, this will result in natural ordering.
 546          * If it is very busy, we will possibly skip events, or even see wrap
 547          * arounds, which could only be avoided with locking.
 548          */
 549         start_idx = cb_nr % DRBD_THREAD_DETAILS_HIST;
 550         for (i = start_idx; i < DRBD_THREAD_DETAILS_HIST; i++)
 551                 seq_print_one_timing_detail(m, tdp+i, now);
 552         for (i = 0; i < start_idx; i++)
 553                 seq_print_one_timing_detail(m, tdp+i, now);
 554 }
 555
 556 static int callback_history_show(struct seq_file *m, void *ignored)
 557 {
 558         struct drbd_connection *connection = m->private;
 559         unsigned long jif = jiffies;
 560
 561         /* BUMP me if you change the file format/content/presentation */
 562         seq_printf(m, "v: %u\n\n", 0);
 563
 564         seq_puts(m, "n\tage\tcallsite\tfn\n");
 565         seq_print_timing_details(m, "worker", connection->w_cb_nr, connection->w_timing_details, jif);
 566         seq_print_timing_details(m, "receiver", connection->r_cb_nr, connection->r_timing_details, jif);
 567         return 0;
 568 }
 569
 570 static int callback_history_open(struct inode *inode, struct file *file)
 571 {
 572         struct drbd_connection *connection = inode->i_private;
 573         return drbd_single_open(file, callback_history_show, connection,
 574                                 &connection->kref, drbd_destroy_connection);
 575 }
 576
 577 static int callback_history_release(struct inode *inode, struct file *file)
 578 {
 579         struct drbd_connection *connection = inode->i_private;
 580         kref_put(&connection->kref, drbd_destroy_connection);
 581         return single_release(inode, file);
 582 }
 583
 584 static const struct file_operations connection_callback_history_fops = {
 585         .owner          = THIS_MODULE,
 586         .open           = callback_history_open,
 587         .read           = seq_read,
 588         .llseek         = seq_lseek,
 589         .release        = callback_history_release,
 590 };
 591
 592 static int connection_oldest_requests_show(struct seq_file *m, void *ignored)
 593 {
 594         struct drbd_connection *connection = m->private;
 595         unsigned long now = jiffies;
 596         struct drbd_request *r1, *r2;
 597
 598         /* BUMP me if you change the file format/content/presentation */
 599         seq_printf(m, "v: %u\n\n", 0);
 600
 601         spin_lock_irq(&connection->resource->req_lock);
 602         r1 = connection->req_next;
 603         if (r1)
 604                 seq_print_minor_vnr_req(m, r1, now);
 605         r2 = connection->req_ack_pending;
 606         if (r2 && r2 != r1) {
 607                 r1 = r2;
 608                 seq_print_minor_vnr_req(m, r1, now);
 609         }
 610         r2 = connection->req_not_net_done;
 611         if (r2 && r2 != r1)
 612                 seq_print_minor_vnr_req(m, r2, now);
 613         spin_unlock_irq(&connection->resource->req_lock);
 614         return 0;
 615 }
 616
 617 static int connection_oldest_requests_open(struct inode *inode, struct file *file)
 618 {
 619         struct drbd_connection *connection = inode->i_private;
 620         return drbd_single_open(file, connection_oldest_requests_show, connection,
 621                                 &connection->kref, drbd_destroy_connection);
 622 }
 623
 624 static int connection_oldest_requests_release(struct inode *inode, struct file *file)
 625 {
 626         struct drbd_connection *connection = inode->i_private;
 627         kref_put(&connection->kref, drbd_destroy_connection);
 628         return single_release(inode, file);
 629 }
 630
 631 static const struct file_operations connection_oldest_requests_fops = {
 632         .owner          = THIS_MODULE,
 633         .open           = connection_oldest_requests_open,
 634         .read           = seq_read,
 635         .llseek         = seq_lseek,
 636         .release        = connection_oldest_requests_release,
 637 };
 638
 639 void drbd_debugfs_connection_add(struct drbd_connection *connection)
 640 {
 641         struct dentry *conns_dir = connection->resource->debugfs_res_connections;
 642         struct dentry *dentry;
 643         if (!conns_dir)
 644                 return;
 645
 646         /* Once we enable mutliple peers,
 647          * these connections will have descriptive names.
 648          * For now, it is just the one connection to the (only) "peer". */
 649         dentry = debugfs_create_dir("peer", conns_dir);
 650         if (IS_ERR_OR_NULL(dentry))
 651                 goto fail;
 652         connection->debugfs_conn = dentry;
 653
 654         dentry = debugfs_create_file("callback_history", S_IRUSR|S_IRGRP,
 655                         connection->debugfs_conn, connection,
 656                         &connection_callback_history_fops);
 657         if (IS_ERR_OR_NULL(dentry))
 658                 goto fail;
 659         connection->debugfs_conn_callback_history = dentry;
 660
 661         dentry = debugfs_create_file("oldest_requests", S_IRUSR|S_IRGRP,
 662                         connection->debugfs_conn, connection,
 663                         &connection_oldest_requests_fops);
 664         if (IS_ERR_OR_NULL(dentry))
 665                 goto fail;
 666         connection->debugfs_conn_oldest_requests = dentry;
 667         return;
 668
 669 fail:
 670         drbd_debugfs_connection_cleanup(connection);
 671         drbd_err(connection, "failed to create debugfs dentry\n");
 672 }
 673
 674 void drbd_debugfs_connection_cleanup(struct drbd_connection *connection)
 675 {
 676         drbd_debugfs_remove(&connection->debugfs_conn_callback_history);
 677         drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests);
 678         drbd_debugfs_remove(&connection->debugfs_conn);
 679 }
 680
 681 static void resync_dump_detail(struct seq_file *m, struct lc_element *e)
 682 {
 683        struct bm_extent *bme = lc_entry(e, struct bm_extent, lce);
 684
 685        seq_printf(m, "%5d %s %s %s", bme->rs_left,
 686                   test_bit(BME_NO_WRITES, &bme->flags) ? "NO_WRITES" : "---------",
 687                   test_bit(BME_LOCKED, &bme->flags) ? "LOCKED" : "------",
 688                   test_bit(BME_PRIORITY, &bme->flags) ? "PRIORITY" : "--------"
 689                   );
 690 }
 691
 692 static int device_resync_extents_show(struct seq_file *m, void *ignored)
 693 {
 694         struct drbd_device *device = m->private;
 695
 696         /* BUMP me if you change the file format/content/presentation */
 697         seq_printf(m, "v: %u\n\n", 0);
 698
 699         if (get_ldev_if_state(device, D_FAILED)) {
 700                 lc_seq_printf_stats(m, device->resync);
 701                 lc_seq_dump_details(m, device->resync, "rs_left flags", resync_dump_detail);
 702                 put_ldev(device);
 703         }
 704         return 0;
 705 }
 706
 707 static int device_act_log_extents_show(struct seq_file *m, void *ignored)
 708 {
 709         struct drbd_device *device = m->private;
 710
 711         /* BUMP me if you change the file format/content/presentation */
 712         seq_printf(m, "v: %u\n\n", 0);
 713
 714         if (get_ldev_if_state(device, D_FAILED)) {
 715                 lc_seq_printf_stats(m, device->act_log);
 716                 lc_seq_dump_details(m, device->act_log, "", NULL);
 717                 put_ldev(device);
 718         }
 719         return 0;
 720 }
 721
 722 static int device_oldest_requests_show(struct seq_file *m, void *ignored)
 723 {
 724         struct drbd_device *device = m->private;
 725         struct drbd_resource *resource = device->resource;
 726         unsigned long now = jiffies;
 727         struct drbd_request *r1, *r2;
 728         int i;
 729
 730         /* BUMP me if you change the file format/content/presentation */
 731         seq_printf(m, "v: %u\n\n", 0);
 732
 733         seq_puts(m, RQ_HDR);
 734         spin_lock_irq(&resource->req_lock);
 735         /* WRITE, then READ */
 736         for (i = 1; i >= 0; --i) {
 737                 r1 = list_first_entry_or_null(&device->pending_master_completion[i],
 738                         struct drbd_request, req_pending_master_completion);
 739                 r2 = list_first_entry_or_null(&device->pending_completion[i],
 740                         struct drbd_request, req_pending_local);
 741                 if (r1)
 742                         seq_print_one_request(m, r1, now);
 743                 if (r2 && r2 != r1)
 744                         seq_print_one_request(m, r2, now);
 745         }
 746         spin_unlock_irq(&resource->req_lock);
 747         return 0;
 748 }
 749
 750 static int device_data_gen_id_show(struct seq_file *m, void *ignored)
 751 {
 752         struct drbd_device *device = m->private;
 753         struct drbd_md *md;
 754         enum drbd_uuid_index idx;
 755
 756         if (!get_ldev_if_state(device, D_FAILED))
 757                 return -ENODEV;
 758
 759         md = &device->ldev->md;
 760         spin_lock_irq(&md->uuid_lock);
 761         for (idx = UI_CURRENT; idx <= UI_HISTORY_END; idx++) {
 762                 seq_printf(m, "0x%016llX\n", md->uuid[idx]);
 763         }
 764         spin_unlock_irq(&md->uuid_lock);
 765         put_ldev(device);
 766         return 0;
 767 }
 768
 769 static int device_ed_gen_id_show(struct seq_file *m, void *ignored)
 770 {
 771         struct drbd_device *device = m->private;
 772         seq_printf(m, "0x%016llX\n", (unsigned long long)device->ed_uuid);
 773         return 0;
 774 }
 775
 776 #define drbd_debugfs_device_attr(name)                                          \
 777 static int device_ ## name ## _open(struct inode *inode, struct file *file)     \
 778 {                                                                               \
 779         struct drbd_device *device = inode->i_private;                          \
 780         return drbd_single_open(file, device_ ## name ## _show, device,         \
 781                                 &device->kref, drbd_destroy_device);            \
 782 }                                                                               \
 783 static int device_ ## name ## _release(struct inode *inode, struct file *file)  \
 784 {                                                                               \
 785         struct drbd_device *device = inode->i_private;                          \
 786         kref_put(&device->kref, drbd_destroy_device);                           \
 787         return single_release(inode, file);                                     \
 788 }                                                                               \
 789 static const struct file_operations device_ ## name ## _fops = {                \
 790         .owner          = THIS_MODULE,                                          \
 791         .open           = device_ ## name ## _open,                             \
 792         .read           = seq_read,                                             \
 793         .llseek         = seq_lseek,                                            \
 794         .release        = device_ ## name ## _release,                          \
 795 };
 796
 797 drbd_debugfs_device_attr(oldest_requests)
 798 drbd_debugfs_device_attr(act_log_extents)
 799 drbd_debugfs_device_attr(resync_extents)
 800 drbd_debugfs_device_attr(data_gen_id)
 801 drbd_debugfs_device_attr(ed_gen_id)
 802
 803 void drbd_debugfs_device_add(struct drbd_device *device)
 804 {
 805         struct dentry *vols_dir = device->resource->debugfs_res_volumes;
 806         char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */
 807         char vnr_buf[8];   /* volume number vnr is even 16 bit only; */
 808         char *slink_name = NULL;
 809
 810         struct dentry *dentry;
 811         if (!vols_dir || !drbd_debugfs_minors)
 812                 return;
 813
 814         snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr);
 815         dentry = debugfs_create_dir(vnr_buf, vols_dir);
 816         if (IS_ERR_OR_NULL(dentry))
 817                 goto fail;
 818         device->debugfs_vol = dentry;
 819
 820         snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor);
 821         slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u",
 822                         device->resource->name, device->vnr);
 823         if (!slink_name)
 824                 goto fail;
 825         dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name);
 826         kfree(slink_name);
 827         slink_name = NULL;
 828         if (IS_ERR_OR_NULL(dentry))
 829                 goto fail;
 830         device->debugfs_minor = dentry;
 831
 832 #define DCF(name)       do {                                    \
 833         dentry = debugfs_create_file(#name, S_IRUSR|S_IRGRP,    \
 834                         device->debugfs_vol, device,            \
 835                         &device_ ## name ## _fops);             \
 836         if (IS_ERR_OR_NULL(dentry))                             \
 837                 goto fail;                                      \
 838         device->debugfs_vol_ ## name = dentry;                  \
 839         } while (0)
 840
 841         DCF(oldest_requests);
 842         DCF(act_log_extents);
 843         DCF(resync_extents);
 844         DCF(data_gen_id);
 845         DCF(ed_gen_id);
 846 #undef DCF
 847         return;
 848
 849 fail:
 850         drbd_debugfs_device_cleanup(device);
 851         drbd_err(device, "failed to create debugfs entries\n");
 852 }
 853
 854 void drbd_debugfs_device_cleanup(struct drbd_device *device)
 855 {
 856         drbd_debugfs_remove(&device->debugfs_minor);
 857         drbd_debugfs_remove(&device->debugfs_vol_oldest_requests);
 858         drbd_debugfs_remove(&device->debugfs_vol_act_log_extents);
 859         drbd_debugfs_remove(&device->debugfs_vol_resync_extents);
 860         drbd_debugfs_remove(&device->debugfs_vol_data_gen_id);
 861         drbd_debugfs_remove(&device->debugfs_vol_ed_gen_id);
 862         drbd_debugfs_remove(&device->debugfs_vol);
 863 }
 864
 865 void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device)
 866 {
 867         struct dentry *conn_dir = peer_device->connection->debugfs_conn;
 868         struct dentry *dentry;
 869         char vnr_buf[8];
 870
 871         if (!conn_dir)
 872                 return;
 873
 874         snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr);
 875         dentry = debugfs_create_dir(vnr_buf, conn_dir);
 876         if (IS_ERR_OR_NULL(dentry))
 877                 goto fail;
 878         peer_device->debugfs_peer_dev = dentry;
 879         return;
 880
 881 fail:
 882         drbd_debugfs_peer_device_cleanup(peer_device);
 883         drbd_err(peer_device, "failed to create debugfs entries\n");
 884 }
 885
 886 void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device)
 887 {
 888         drbd_debugfs_remove(&peer_device->debugfs_peer_dev);
 889 }
 890
 891 static int drbd_version_show(struct seq_file *m, void *ignored)
 892 {
 893         seq_printf(m, "# %s\n", drbd_buildtag());
 894         seq_printf(m, "VERSION=%s\n", REL_VERSION);
 895         seq_printf(m, "API_VERSION=%u\n", API_VERSION);
 896         seq_printf(m, "PRO_VERSION_MIN=%u\n", PRO_VERSION_MIN);
 897         seq_printf(m, "PRO_VERSION_MAX=%u\n", PRO_VERSION_MAX);
 898         return 0;
 899 }
 900
 901 static int drbd_version_open(struct inode *inode, struct file *file)
 902 {
 903         return single_open(file, drbd_version_show, NULL);
 904 }
 905
 906 static const struct file_operations drbd_version_fops = {
 907         .owner = THIS_MODULE,
 908         .open = drbd_version_open,
 909         .llseek = seq_lseek,
 910         .read = seq_read,
 911         .release = single_release,
 912 };
 913
 914 /* not __exit, may be indirectly called
 915  * from the module-load-failure path as well. */
 916 void drbd_debugfs_cleanup(void)
 917 {
 918         drbd_debugfs_remove(&drbd_debugfs_resources);
 919         drbd_debugfs_remove(&drbd_debugfs_minors);
 920         drbd_debugfs_remove(&drbd_debugfs_version);
 921         drbd_debugfs_remove(&drbd_debugfs_root);
 922 }
 923
 924 int __init drbd_debugfs_init(void)
 925 {
 926         struct dentry *dentry;
 927
 928         dentry = debugfs_create_dir("drbd", NULL);
 929         if (IS_ERR_OR_NULL(dentry))
 930                 goto fail;
 931         drbd_debugfs_root = dentry;
 932
 933         dentry = debugfs_create_file("version", 0444, drbd_debugfs_root, NULL, &drbd_version_fops);
 934         if (IS_ERR_OR_NULL(dentry))
 935                 goto fail;
 936         drbd_debugfs_version = dentry;
 937
 938         dentry = debugfs_create_dir("resources", drbd_debugfs_root);
 939         if (IS_ERR_OR_NULL(dentry))
 940                 goto fail;
 941         drbd_debugfs_resources = dentry;
 942
 943         dentry = debugfs_create_dir("minors", drbd_debugfs_root);
 944         if (IS_ERR_OR_NULL(dentry))
 945                 goto fail;
 946         drbd_debugfs_minors = dentry;
 947         return 0;
 948
 949 fail:
 950         drbd_debugfs_cleanup();
 951         if (dentry)
 952                 return PTR_ERR(dentry);
 953         else
 954                 return -EINVAL;
 955 }