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 /* simple_positive(file->f_dentry) respectively debugfs_positive(),
 423  * but neither is "reachable" from here.
 424  * So we have our own inline version of it above.  :-( */
 425 static inline int debugfs_positive(struct dentry *dentry)
 426 {
 427         return dentry->d_inode && !d_unhashed(dentry);
 428 }
 429
 430 /* make sure at *open* time that the respective object won't go away. */
 431 static int drbd_single_open(struct file *file, int (*show)(struct seq_file *, void *),
 432                                 void *data, struct kref *kref,
 433                                 void (*release)(struct kref *))
 434 {
 435         struct dentry *parent;
 436         int ret = -ESTALE;
 437
 438         /* Are we still linked,
 439          * or has debugfs_remove() already been called? */
 440         parent = file->f_dentry->d_parent;
 441         /* not sure if this can happen: */
 442         if (!parent || !parent->d_inode)
 443                 goto out;
 444         /* serialize with d_delete() */
 445         mutex_lock(&parent->d_inode->i_mutex);
 446         /* Make sure the object is still alive */
 447         if (debugfs_positive(file->f_dentry)
 448         && kref_get_unless_zero(kref))
 449                 ret = 0;
 450         mutex_unlock(&parent->d_inode->i_mutex);
 451         if (!ret) {
 452                 ret = single_open(file, show, data);
 453                 if (ret)
 454                         kref_put(kref, release);
 455         }
 456 out:
 457         return ret;
 458 }
 459
 460 static int in_flight_summary_open(struct inode *inode, struct file *file)
 461 {
 462         struct drbd_resource *resource = inode->i_private;
 463         return drbd_single_open(file, in_flight_summary_show, resource,
 464                                 &resource->kref, drbd_destroy_resource);
 465 }
 466
 467 static int in_flight_summary_release(struct inode *inode, struct file *file)
 468 {
 469         struct drbd_resource *resource = inode->i_private;
 470         kref_put(&resource->kref, drbd_destroy_resource);
 471         return single_release(inode, file);
 472 }
 473
 474 static const struct file_operations in_flight_summary_fops = {
 475         .owner          = THIS_MODULE,
 476         .open           = in_flight_summary_open,
 477         .read           = seq_read,
 478         .llseek         = seq_lseek,
 479         .release        = in_flight_summary_release,
 480 };
 481
 482 void drbd_debugfs_resource_add(struct drbd_resource *resource)
 483 {
 484         struct dentry *dentry;
 485         if (!drbd_debugfs_resources)
 486                 return;
 487
 488         dentry = debugfs_create_dir(resource->name, drbd_debugfs_resources);
 489         if (IS_ERR_OR_NULL(dentry))
 490                 goto fail;
 491         resource->debugfs_res = dentry;
 492
 493         dentry = debugfs_create_dir("volumes", resource->debugfs_res);
 494         if (IS_ERR_OR_NULL(dentry))
 495                 goto fail;
 496         resource->debugfs_res_volumes = dentry;
 497
 498         dentry = debugfs_create_dir("connections", resource->debugfs_res);
 499         if (IS_ERR_OR_NULL(dentry))
 500                 goto fail;
 501         resource->debugfs_res_connections = dentry;
 502
 503         dentry = debugfs_create_file("in_flight_summary", S_IRUSR|S_IRGRP,
 504                         resource->debugfs_res, resource,
 505                         &in_flight_summary_fops);
 506         if (IS_ERR_OR_NULL(dentry))
 507                 goto fail;
 508         resource->debugfs_res_in_flight_summary = dentry;
 509         return;
 510
 511 fail:
 512         drbd_debugfs_resource_cleanup(resource);
 513         drbd_err(resource, "failed to create debugfs dentry\n");
 514 }
 515
 516 static void drbd_debugfs_remove(struct dentry **dp)
 517 {
 518         debugfs_remove(*dp);
 519         *dp = NULL;
 520 }
 521
 522 void drbd_debugfs_resource_cleanup(struct drbd_resource *resource)
 523 {
 524         /* it is ok to call debugfs_remove(NULL) */
 525         drbd_debugfs_remove(&resource->debugfs_res_in_flight_summary);
 526         drbd_debugfs_remove(&resource->debugfs_res_connections);
 527         drbd_debugfs_remove(&resource->debugfs_res_volumes);
 528         drbd_debugfs_remove(&resource->debugfs_res);
 529 }
 530
 531 static void seq_print_one_timing_detail(struct seq_file *m,
 532         const struct drbd_thread_timing_details *tdp,
 533         unsigned long now)
 534 {
 535         struct drbd_thread_timing_details td;
 536         /* No locking...
 537          * use temporary assignment to get at consistent data. */
 538         do {
 539                 td = *tdp;
 540         } while (td.cb_nr != tdp->cb_nr);
 541         if (!td.cb_addr)
 542                 return;
 543         seq_printf(m, "%u\t%d\t%s:%u\t%ps\n",
 544                         td.cb_nr,
 545                         jiffies_to_msecs(now - td.start_jif),
 546                         td.caller_fn, td.line,
 547                         td.cb_addr);
 548 }
 549
 550 static void seq_print_timing_details(struct seq_file *m,
 551                 const char *title,
 552                 unsigned int cb_nr, struct drbd_thread_timing_details *tdp, unsigned long now)
 553 {
 554         unsigned int start_idx;
 555         unsigned int i;
 556
 557         seq_printf(m, "%s\n", title);
 558         /* If not much is going on, this will result in natural ordering.
 559          * If it is very busy, we will possibly skip events, or even see wrap
 560          * arounds, which could only be avoided with locking.
 561          */
 562         start_idx = cb_nr % DRBD_THREAD_DETAILS_HIST;
 563         for (i = start_idx; i < DRBD_THREAD_DETAILS_HIST; i++)
 564                 seq_print_one_timing_detail(m, tdp+i, now);
 565         for (i = 0; i < start_idx; i++)
 566                 seq_print_one_timing_detail(m, tdp+i, now);
 567 }
 568
 569 static int callback_history_show(struct seq_file *m, void *ignored)
 570 {
 571         struct drbd_connection *connection = m->private;
 572         unsigned long jif = jiffies;
 573
 574         /* BUMP me if you change the file format/content/presentation */
 575         seq_printf(m, "v: %u\n\n", 0);
 576
 577         seq_puts(m, "n\tage\tcallsite\tfn\n");
 578         seq_print_timing_details(m, "worker", connection->w_cb_nr, connection->w_timing_details, jif);
 579         seq_print_timing_details(m, "receiver", connection->r_cb_nr, connection->r_timing_details, jif);
 580         return 0;
 581 }
 582
 583 static int callback_history_open(struct inode *inode, struct file *file)
 584 {
 585         struct drbd_connection *connection = inode->i_private;
 586         return drbd_single_open(file, callback_history_show, connection,
 587                                 &connection->kref, drbd_destroy_connection);
 588 }
 589
 590 static int callback_history_release(struct inode *inode, struct file *file)
 591 {
 592         struct drbd_connection *connection = inode->i_private;
 593         kref_put(&connection->kref, drbd_destroy_connection);
 594         return single_release(inode, file);
 595 }
 596
 597 static const struct file_operations connection_callback_history_fops = {
 598         .owner          = THIS_MODULE,
 599         .open           = callback_history_open,
 600         .read           = seq_read,
 601         .llseek         = seq_lseek,
 602         .release        = callback_history_release,
 603 };
 604
 605 static int connection_oldest_requests_show(struct seq_file *m, void *ignored)
 606 {
 607         struct drbd_connection *connection = m->private;
 608         unsigned long now = jiffies;
 609         struct drbd_request *r1, *r2;
 610
 611         /* BUMP me if you change the file format/content/presentation */
 612         seq_printf(m, "v: %u\n\n", 0);
 613
 614         spin_lock_irq(&connection->resource->req_lock);
 615         r1 = connection->req_next;
 616         if (r1)
 617                 seq_print_minor_vnr_req(m, r1, now);
 618         r2 = connection->req_ack_pending;
 619         if (r2 && r2 != r1) {
 620                 r1 = r2;
 621                 seq_print_minor_vnr_req(m, r1, now);
 622         }
 623         r2 = connection->req_not_net_done;
 624         if (r2 && r2 != r1)
 625                 seq_print_minor_vnr_req(m, r2, now);
 626         spin_unlock_irq(&connection->resource->req_lock);
 627         return 0;
 628 }
 629
 630 static int connection_oldest_requests_open(struct inode *inode, struct file *file)
 631 {
 632         struct drbd_connection *connection = inode->i_private;
 633         return drbd_single_open(file, connection_oldest_requests_show, connection,
 634                                 &connection->kref, drbd_destroy_connection);
 635 }
 636
 637 static int connection_oldest_requests_release(struct inode *inode, struct file *file)
 638 {
 639         struct drbd_connection *connection = inode->i_private;
 640         kref_put(&connection->kref, drbd_destroy_connection);
 641         return single_release(inode, file);
 642 }
 643
 644 static const struct file_operations connection_oldest_requests_fops = {
 645         .owner          = THIS_MODULE,
 646         .open           = connection_oldest_requests_open,
 647         .read           = seq_read,
 648         .llseek         = seq_lseek,
 649         .release        = connection_oldest_requests_release,
 650 };
 651
 652 void drbd_debugfs_connection_add(struct drbd_connection *connection)
 653 {
 654         struct dentry *conns_dir = connection->resource->debugfs_res_connections;
 655         struct dentry *dentry;
 656         if (!conns_dir)
 657                 return;
 658
 659         /* Once we enable mutliple peers,
 660          * these connections will have descriptive names.
 661          * For now, it is just the one connection to the (only) "peer". */
 662         dentry = debugfs_create_dir("peer", conns_dir);
 663         if (IS_ERR_OR_NULL(dentry))
 664                 goto fail;
 665         connection->debugfs_conn = dentry;
 666
 667         dentry = debugfs_create_file("callback_history", S_IRUSR|S_IRGRP,
 668                         connection->debugfs_conn, connection,
 669                         &connection_callback_history_fops);
 670         if (IS_ERR_OR_NULL(dentry))
 671                 goto fail;
 672         connection->debugfs_conn_callback_history = dentry;
 673
 674         dentry = debugfs_create_file("oldest_requests", S_IRUSR|S_IRGRP,
 675                         connection->debugfs_conn, connection,
 676                         &connection_oldest_requests_fops);
 677         if (IS_ERR_OR_NULL(dentry))
 678                 goto fail;
 679         connection->debugfs_conn_oldest_requests = dentry;
 680         return;
 681
 682 fail:
 683         drbd_debugfs_connection_cleanup(connection);
 684         drbd_err(connection, "failed to create debugfs dentry\n");
 685 }
 686
 687 void drbd_debugfs_connection_cleanup(struct drbd_connection *connection)
 688 {
 689         drbd_debugfs_remove(&connection->debugfs_conn_callback_history);
 690         drbd_debugfs_remove(&connection->debugfs_conn_oldest_requests);
 691         drbd_debugfs_remove(&connection->debugfs_conn);
 692 }
 693
 694 static void resync_dump_detail(struct seq_file *m, struct lc_element *e)
 695 {
 696        struct bm_extent *bme = lc_entry(e, struct bm_extent, lce);
 697
 698        seq_printf(m, "%5d %s %s %s", bme->rs_left,
 699                   test_bit(BME_NO_WRITES, &bme->flags) ? "NO_WRITES" : "---------",
 700                   test_bit(BME_LOCKED, &bme->flags) ? "LOCKED" : "------",
 701                   test_bit(BME_PRIORITY, &bme->flags) ? "PRIORITY" : "--------"
 702                   );
 703 }
 704
 705 static int device_resync_extents_show(struct seq_file *m, void *ignored)
 706 {
 707         struct drbd_device *device = m->private;
 708
 709         /* BUMP me if you change the file format/content/presentation */
 710         seq_printf(m, "v: %u\n\n", 0);
 711
 712         if (get_ldev_if_state(device, D_FAILED)) {
 713                 lc_seq_printf_stats(m, device->resync);
 714                 lc_seq_dump_details(m, device->resync, "rs_left flags", resync_dump_detail);
 715                 put_ldev(device);
 716         }
 717         return 0;
 718 }
 719
 720 static int device_act_log_extents_show(struct seq_file *m, void *ignored)
 721 {
 722         struct drbd_device *device = m->private;
 723
 724         /* BUMP me if you change the file format/content/presentation */
 725         seq_printf(m, "v: %u\n\n", 0);
 726
 727         if (get_ldev_if_state(device, D_FAILED)) {
 728                 lc_seq_printf_stats(m, device->act_log);
 729                 lc_seq_dump_details(m, device->act_log, "", NULL);
 730                 put_ldev(device);
 731         }
 732         return 0;
 733 }
 734
 735 static int device_oldest_requests_show(struct seq_file *m, void *ignored)
 736 {
 737         struct drbd_device *device = m->private;
 738         struct drbd_resource *resource = device->resource;
 739         unsigned long now = jiffies;
 740         struct drbd_request *r1, *r2;
 741         int i;
 742
 743         /* BUMP me if you change the file format/content/presentation */
 744         seq_printf(m, "v: %u\n\n", 0);
 745
 746         seq_puts(m, RQ_HDR);
 747         spin_lock_irq(&resource->req_lock);
 748         /* WRITE, then READ */
 749         for (i = 1; i >= 0; --i) {
 750                 r1 = list_first_entry_or_null(&device->pending_master_completion[i],
 751                         struct drbd_request, req_pending_master_completion);
 752                 r2 = list_first_entry_or_null(&device->pending_completion[i],
 753                         struct drbd_request, req_pending_local);
 754                 if (r1)
 755                         seq_print_one_request(m, r1, now);
 756                 if (r2 && r2 != r1)
 757                         seq_print_one_request(m, r2, now);
 758         }
 759         spin_unlock_irq(&resource->req_lock);
 760         return 0;
 761 }
 762
 763 static int device_data_gen_id_show(struct seq_file *m, void *ignored)
 764 {
 765         struct drbd_device *device = m->private;
 766         struct drbd_md *md;
 767         enum drbd_uuid_index idx;
 768
 769         if (!get_ldev_if_state(device, D_FAILED))
 770                 return -ENODEV;
 771
 772         md = &device->ldev->md;
 773         spin_lock_irq(&md->uuid_lock);
 774         for (idx = UI_CURRENT; idx <= UI_HISTORY_END; idx++) {
 775                 seq_printf(m, "0x%016llX\n", md->uuid[idx]);
 776         }
 777         spin_unlock_irq(&md->uuid_lock);
 778         put_ldev(device);
 779         return 0;
 780 }
 781
 782 #define drbd_debugfs_device_attr(name)                                          \
 783 static int device_ ## name ## _open(struct inode *inode, struct file *file)     \
 784 {                                                                               \
 785         struct drbd_device *device = inode->i_private;                          \
 786         return drbd_single_open(file, device_ ## name ## _show, device,         \
 787                                 &device->kref, drbd_destroy_device);            \
 788 }                                                                               \
 789 static int device_ ## name ## _release(struct inode *inode, struct file *file)  \
 790 {                                                                               \
 791         struct drbd_device *device = inode->i_private;                          \
 792         kref_put(&device->kref, drbd_destroy_device);                           \
 793         return single_release(inode, file);                                     \
 794 }                                                                               \
 795 static const struct file_operations device_ ## name ## _fops = {                \
 796         .owner          = THIS_MODULE,                                          \
 797         .open           = device_ ## name ## _open,                             \
 798         .read           = seq_read,                                             \
 799         .llseek         = seq_lseek,                                            \
 800         .release        = device_ ## name ## _release,                          \
 801 };
 802
 803 drbd_debugfs_device_attr(oldest_requests)
 804 drbd_debugfs_device_attr(act_log_extents)
 805 drbd_debugfs_device_attr(resync_extents)
 806 drbd_debugfs_device_attr(data_gen_id)
 807
 808 void drbd_debugfs_device_add(struct drbd_device *device)
 809 {
 810         struct dentry *vols_dir = device->resource->debugfs_res_volumes;
 811         char minor_buf[8]; /* MINORMASK, MINORBITS == 20; */
 812         char vnr_buf[8];   /* volume number vnr is even 16 bit only; */
 813         char *slink_name = NULL;
 814
 815         struct dentry *dentry;
 816         if (!vols_dir || !drbd_debugfs_minors)
 817                 return;
 818
 819         snprintf(vnr_buf, sizeof(vnr_buf), "%u", device->vnr);
 820         dentry = debugfs_create_dir(vnr_buf, vols_dir);
 821         if (IS_ERR_OR_NULL(dentry))
 822                 goto fail;
 823         device->debugfs_vol = dentry;
 824
 825         snprintf(minor_buf, sizeof(minor_buf), "%u", device->minor);
 826         slink_name = kasprintf(GFP_KERNEL, "../resources/%s/volumes/%u",
 827                         device->resource->name, device->vnr);
 828         if (!slink_name)
 829                 goto fail;
 830         dentry = debugfs_create_symlink(minor_buf, drbd_debugfs_minors, slink_name);
 831         kfree(slink_name);
 832         slink_name = NULL;
 833         if (IS_ERR_OR_NULL(dentry))
 834                 goto fail;
 835         device->debugfs_minor = dentry;
 836
 837 #define DCF(name)       do {                                    \
 838         dentry = debugfs_create_file(#name, S_IRUSR|S_IRGRP,    \
 839                         device->debugfs_vol, device,            \
 840                         &device_ ## name ## _fops);             \
 841         if (IS_ERR_OR_NULL(dentry))                             \
 842                 goto fail;                                      \
 843         device->debugfs_vol_ ## name = dentry;                  \
 844         } while (0)
 845
 846         DCF(oldest_requests);
 847         DCF(act_log_extents);
 848         DCF(resync_extents);
 849         DCF(data_gen_id);
 850 #undef DCF
 851         return;
 852
 853 fail:
 854         drbd_debugfs_device_cleanup(device);
 855         drbd_err(device, "failed to create debugfs entries\n");
 856 }
 857
 858 void drbd_debugfs_device_cleanup(struct drbd_device *device)
 859 {
 860         drbd_debugfs_remove(&device->debugfs_minor);
 861         drbd_debugfs_remove(&device->debugfs_vol_oldest_requests);
 862         drbd_debugfs_remove(&device->debugfs_vol_act_log_extents);
 863         drbd_debugfs_remove(&device->debugfs_vol_resync_extents);
 864         drbd_debugfs_remove(&device->debugfs_vol_data_gen_id);
 865         drbd_debugfs_remove(&device->debugfs_vol);
 866 }
 867
 868 void drbd_debugfs_peer_device_add(struct drbd_peer_device *peer_device)
 869 {
 870         struct dentry *conn_dir = peer_device->connection->debugfs_conn;
 871         struct dentry *dentry;
 872         char vnr_buf[8];
 873
 874         if (!conn_dir)
 875                 return;
 876
 877         snprintf(vnr_buf, sizeof(vnr_buf), "%u", peer_device->device->vnr);
 878         dentry = debugfs_create_dir(vnr_buf, conn_dir);
 879         if (IS_ERR_OR_NULL(dentry))
 880                 goto fail;
 881         peer_device->debugfs_peer_dev = dentry;
 882         return;
 883
 884 fail:
 885         drbd_debugfs_peer_device_cleanup(peer_device);
 886         drbd_err(peer_device, "failed to create debugfs entries\n");
 887 }
 888
 889 void drbd_debugfs_peer_device_cleanup(struct drbd_peer_device *peer_device)
 890 {
 891         drbd_debugfs_remove(&peer_device->debugfs_peer_dev);
 892 }
 893
 894 static int drbd_version_show(struct seq_file *m, void *ignored)
 895 {
 896         seq_printf(m, "# %s\n", drbd_buildtag());
 897         seq_printf(m, "VERSION=%s\n", REL_VERSION);
 898         seq_printf(m, "API_VERSION=%u\n", API_VERSION);
 899         seq_printf(m, "PRO_VERSION_MIN=%u\n", PRO_VERSION_MIN);
 900         seq_printf(m, "PRO_VERSION_MAX=%u\n", PRO_VERSION_MAX);
 901         return 0;
 902 }
 903
 904 static int drbd_version_open(struct inode *inode, struct file *file)
 905 {
 906         return single_open(file, drbd_version_show, NULL);
 907 }
 908
 909 static struct file_operations drbd_version_fops = {
 910         .owner = THIS_MODULE,
 911         .open = drbd_version_open,
 912         .llseek = seq_lseek,
 913         .read = seq_read,
 914         .release = single_release,
 915 };
 916
 917 /* not __exit, may be indirectly called
 918  * from the module-load-failure path as well. */
 919 void drbd_debugfs_cleanup(void)
 920 {
 921         drbd_debugfs_remove(&drbd_debugfs_resources);
 922         drbd_debugfs_remove(&drbd_debugfs_minors);
 923         drbd_debugfs_remove(&drbd_debugfs_version);
 924         drbd_debugfs_remove(&drbd_debugfs_root);
 925 }
 926
 927 int __init drbd_debugfs_init(void)
 928 {
 929         struct dentry *dentry;
 930
 931         dentry = debugfs_create_dir("drbd", NULL);
 932         if (IS_ERR_OR_NULL(dentry))
 933                 goto fail;
 934         drbd_debugfs_root = dentry;
 935
 936         dentry = debugfs_create_file("version", 0444, drbd_debugfs_root, NULL, &drbd_version_fops);
 937         if (IS_ERR_OR_NULL(dentry))
 938                 goto fail;
 939         drbd_debugfs_version = dentry;
 940
 941         dentry = debugfs_create_dir("resources", drbd_debugfs_root);
 942         if (IS_ERR_OR_NULL(dentry))
 943                 goto fail;
 944         drbd_debugfs_resources = dentry;
 945
 946         dentry = debugfs_create_dir("minors", drbd_debugfs_root);
 947         if (IS_ERR_OR_NULL(dentry))
 948                 goto fail;
 949         drbd_debugfs_minors = dentry;
 950         return 0;
 951
 952 fail:
 953         drbd_debugfs_cleanup();
 954         if (dentry)
 955                 return PTR_ERR(dentry);
 956         else
 957                 return -EINVAL;
 958 }