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