SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/ceph/osd_client.c

   1 #include "ceph_debug.h"
   2
   3 #include <linux/err.h>
   4 #include <linux/highmem.h>
   5 #include <linux/mm.h>
   6 #include <linux/pagemap.h>
   7 #include <linux/slab.h>
   8 #include <linux/uaccess.h>
   9
  10 #include "super.h"
  11 #include "osd_client.h"
  12 #include "messenger.h"
  13 #include "decode.h"
  14 #include "auth.h"
  15
  16 const static struct ceph_connection_operations osd_con_ops;
  17
  18 static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  19
  20 /*
  21  * Implement client access to distributed object storage cluster.
  22  *
  23  * All data objects are stored within a cluster/cloud of OSDs, or
  24  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  25  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  26  * remote daemons serving up and coordinating consistent and safe
  27  * access to storage.
  28  *
  29  * Cluster membership and the mapping of data objects onto storage devices
  30  * are described by the osd map.
  31  *
  32  * We keep track of pending OSD requests (read, write), resubmit
  33  * requests to different OSDs when the cluster topology/data layout
  34  * change, or retry the affected requests when the communications
  35  * channel with an OSD is reset.
  36  */
  37
  38 /*
  39  * calculate the mapping of a file extent onto an object, and fill out the
  40  * request accordingly.  shorten extent as necessary if it crosses an
  41  * object boundary.
  42  *
  43  * fill osd op in request message.
  44  */
  45 static void calc_layout(struct ceph_osd_client *osdc,
  46                         struct ceph_vino vino, struct ceph_file_layout *layout,
  47                         u64 off, u64 *plen,
  48                         struct ceph_osd_request *req)
  49 {
  50         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
  51         struct ceph_osd_op *op = (void *)(reqhead + 1);
  52         u64 orig_len = *plen;
  53         u64 objoff, objlen;    /* extent in object */
  54         u64 bno;
  55
  56         reqhead->snapid = cpu_to_le64(vino.snap);
  57
  58         /* object extent? */
  59         ceph_calc_file_object_mapping(layout, off, plen, &bno,
  60                                       &objoff, &objlen);
  61         if (*plen < orig_len)
  62                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  63                      orig_len - *plen, off, *plen);
  64
  65         sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
  66         req->r_oid_len = strlen(req->r_oid);
  67
  68         op->extent.offset = cpu_to_le64(objoff);
  69         op->extent.length = cpu_to_le64(objlen);
  70         req->r_num_pages = calc_pages_for(off, *plen);
  71
  72         dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
  73              req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
  74 }
  75
  76
  77 /*
  78  * requests
  79  */
  80 void ceph_osdc_put_request(struct ceph_osd_request *req)
  81 {
  82         dout("osdc put_request %p %d -> %d\n", req, atomic_read(&req->r_ref),
  83              atomic_read(&req->r_ref)-1);
  84         BUG_ON(atomic_read(&req->r_ref) <= 0);
  85         if (atomic_dec_and_test(&req->r_ref)) {
  86                 if (req->r_request)
  87                         ceph_msg_put(req->r_request);
  88                 if (req->r_reply)
  89                         ceph_msg_put(req->r_reply);
  90                 if (req->r_own_pages)
  91                         ceph_release_page_vector(req->r_pages,
  92                                                  req->r_num_pages);
  93                 ceph_put_snap_context(req->r_snapc);
  94                 if (req->r_mempool)
  95                         mempool_free(req, req->r_osdc->req_mempool);
  96                 else
  97                         kfree(req);
  98         }
  99 }
 100
 101 /*
 102  * build new request AND message, calculate layout, and adjust file
 103  * extent as needed.
 104  *
 105  * if the file was recently truncated, we include information about its
 106  * old and new size so that the object can be updated appropriately.  (we
 107  * avoid synchronously deleting truncated objects because it's slow.)
 108  *
 109  * if @do_sync, include a 'startsync' command so that the osd will flush
 110  * data quickly.
 111  */
 112 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 113                                                struct ceph_file_layout *layout,
 114                                                struct ceph_vino vino,
 115                                                u64 off, u64 *plen,
 116                                                int opcode, int flags,
 117                                                struct ceph_snap_context *snapc,
 118                                                int do_sync,
 119                                                u32 truncate_seq,
 120                                                u64 truncate_size,
 121                                                struct timespec *mtime,
 122                                                bool use_mempool, int num_reply)
 123 {
 124         struct ceph_osd_request *req;
 125         struct ceph_msg *msg;
 126         struct ceph_osd_request_head *head;
 127         struct ceph_osd_op *op;
 128         void *p;
 129         int do_trunc = truncate_seq && (off + *plen > truncate_size);
 130         int num_op = 1 + do_sync + do_trunc;
 131         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 132         int err, i;
 133         u64 prevofs;
 134
 135         if (use_mempool) {
 136                 req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
 137                 memset(req, 0, sizeof(*req));
 138         } else {
 139                 req = kzalloc(sizeof(*req), GFP_NOFS);
 140         }
 141         if (req == NULL)
 142                 return ERR_PTR(-ENOMEM);
 143
 144         err = ceph_msgpool_resv(&osdc->msgpool_op_reply, num_reply);
 145         if (err) {
 146                 ceph_osdc_put_request(req);
 147                 return ERR_PTR(-ENOMEM);
 148         }
 149
 150         req->r_osdc = osdc;
 151         req->r_mempool = use_mempool;
 152         atomic_set(&req->r_ref, 1);
 153         init_completion(&req->r_completion);
 154         init_completion(&req->r_safe_completion);
 155         INIT_LIST_HEAD(&req->r_unsafe_item);
 156         req->r_flags = flags;
 157
 158         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
 159
 160         /* create message; allow space for oid */
 161         msg_size += 40;
 162         if (snapc)
 163                 msg_size += sizeof(u64) * snapc->num_snaps;
 164         if (use_mempool)
 165                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 166         else
 167                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
 168         if (IS_ERR(msg)) {
 169                 ceph_msgpool_resv(&osdc->msgpool_op_reply, num_reply);
 170                 ceph_osdc_put_request(req);
 171                 return ERR_PTR(PTR_ERR(msg));
 172         }
 173         msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
 174         memset(msg->front.iov_base, 0, msg->front.iov_len);
 175         head = msg->front.iov_base;
 176         op = (void *)(head + 1);
 177         p = (void *)(op + num_op);
 178
 179         req->r_request = msg;
 180         req->r_snapc = ceph_get_snap_context(snapc);
 181
 182         head->client_inc = cpu_to_le32(1); /* always, for now. */
 183         head->flags = cpu_to_le32(flags);
 184         if (flags & CEPH_OSD_FLAG_WRITE)
 185                 ceph_encode_timespec(&head->mtime, mtime);
 186         head->num_ops = cpu_to_le16(num_op);
 187         op->op = cpu_to_le16(opcode);
 188
 189         /* calculate max write size */
 190         calc_layout(osdc, vino, layout, off, plen, req);
 191         req->r_file_layout = *layout;  /* keep a copy */
 192
 193         if (flags & CEPH_OSD_FLAG_WRITE) {
 194                 req->r_request->hdr.data_off = cpu_to_le16(off);
 195                 req->r_request->hdr.data_len = cpu_to_le32(*plen);
 196                 op->payload_len = cpu_to_le32(*plen);
 197         }
 198
 199         /* fill in oid */
 200         head->object_len = cpu_to_le32(req->r_oid_len);
 201         memcpy(p, req->r_oid, req->r_oid_len);
 202         p += req->r_oid_len;
 203
 204         /* additional ops */
 205         if (do_trunc) {
 206                 op++;
 207                 op->op = cpu_to_le16(opcode == CEPH_OSD_OP_READ ?
 208                              CEPH_OSD_OP_MASKTRUNC : CEPH_OSD_OP_SETTRUNC);
 209                 op->trunc.truncate_seq = cpu_to_le32(truncate_seq);
 210                 prevofs = le64_to_cpu((op-1)->extent.offset);
 211                 op->trunc.truncate_size = cpu_to_le64(truncate_size -
 212                                                       (off-prevofs));
 213         }
 214         if (do_sync) {
 215                 op++;
 216                 op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC);
 217         }
 218         if (snapc) {
 219                 head->snap_seq = cpu_to_le64(snapc->seq);
 220                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
 221                 for (i = 0; i < snapc->num_snaps; i++) {
 222                         put_unaligned_le64(snapc->snaps[i], p);
 223                         p += sizeof(u64);
 224                 }
 225         }
 226
 227         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
 228         return req;
 229 }
 230
 231 /*
 232  * We keep osd requests in an rbtree, sorted by ->r_tid.
 233  */
 234 static void __insert_request(struct ceph_osd_client *osdc,
 235                              struct ceph_osd_request *new)
 236 {
 237         struct rb_node **p = &osdc->requests.rb_node;
 238         struct rb_node *parent = NULL;
 239         struct ceph_osd_request *req = NULL;
 240
 241         while (*p) {
 242                 parent = *p;
 243                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 244                 if (new->r_tid < req->r_tid)
 245                         p = &(*p)->rb_left;
 246                 else if (new->r_tid > req->r_tid)
 247                         p = &(*p)->rb_right;
 248                 else
 249                         BUG();
 250         }
 251
 252         rb_link_node(&new->r_node, parent, p);
 253         rb_insert_color(&new->r_node, &osdc->requests);
 254 }
 255
 256 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 257                                                  u64 tid)
 258 {
 259         struct ceph_osd_request *req;
 260         struct rb_node *n = osdc->requests.rb_node;
 261
 262         while (n) {
 263                 req = rb_entry(n, struct ceph_osd_request, r_node);
 264                 if (tid < req->r_tid)
 265                         n = n->rb_left;
 266                 else if (tid > req->r_tid)
 267                         n = n->rb_right;
 268                 else
 269                         return req;
 270         }
 271         return NULL;
 272 }
 273
 274 static struct ceph_osd_request *
 275 __lookup_request_ge(struct ceph_osd_client *osdc,
 276                     u64 tid)
 277 {
 278         struct ceph_osd_request *req;
 279         struct rb_node *n = osdc->requests.rb_node;
 280
 281         while (n) {
 282                 req = rb_entry(n, struct ceph_osd_request, r_node);
 283                 if (tid < req->r_tid) {
 284                         if (!n->rb_left)
 285                                 return req;
 286                         n = n->rb_left;
 287                 } else if (tid > req->r_tid) {
 288                         n = n->rb_right;
 289                 } else {
 290                         return req;
 291                 }
 292         }
 293         return NULL;
 294 }
 295
 296
 297 /*
 298  * If the osd connection drops, we need to resubmit all requests.
 299  */
 300 static void osd_reset(struct ceph_connection *con)
 301 {
 302         struct ceph_osd *osd = con->private;
 303         struct ceph_osd_client *osdc;
 304
 305         if (!osd)
 306                 return;
 307         dout("osd_reset osd%d\n", osd->o_osd);
 308         osdc = osd->o_osdc;
 309         osd->o_incarnation++;
 310         down_read(&osdc->map_sem);
 311         kick_requests(osdc, osd);
 312         up_read(&osdc->map_sem);
 313 }
 314
 315 /*
 316  * Track open sessions with osds.
 317  */
 318 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
 319 {
 320         struct ceph_osd *osd;
 321
 322         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 323         if (!osd)
 324                 return NULL;
 325
 326         atomic_set(&osd->o_ref, 1);
 327         osd->o_osdc = osdc;
 328         INIT_LIST_HEAD(&osd->o_requests);
 329         osd->o_incarnation = 1;
 330
 331         ceph_con_init(osdc->client->msgr, &osd->o_con);
 332         osd->o_con.private = osd;
 333         osd->o_con.ops = &osd_con_ops;
 334         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
 335
 336         return osd;
 337 }
 338
 339 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 340 {
 341         if (atomic_inc_not_zero(&osd->o_ref)) {
 342                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 343                      atomic_read(&osd->o_ref));
 344                 return osd;
 345         } else {
 346                 dout("get_osd %p FAIL\n", osd);
 347                 return NULL;
 348         }
 349 }
 350
 351 static void put_osd(struct ceph_osd *osd)
 352 {
 353         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 354              atomic_read(&osd->o_ref) - 1);
 355         if (atomic_dec_and_test(&osd->o_ref))
 356                 kfree(osd);
 357 }
 358
 359 /*
 360  * remove an osd from our map
 361  */
 362 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 363 {
 364         dout("remove_osd %p\n", osd);
 365         BUG_ON(!list_empty(&osd->o_requests));
 366         rb_erase(&osd->o_node, &osdc->osds);
 367         ceph_con_close(&osd->o_con);
 368         put_osd(osd);
 369 }
 370
 371 /*
 372  * reset osd connect
 373  */
 374 static int reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 375 {
 376         int ret = 0;
 377
 378         dout("reset_osd %p osd%d\n", osd, osd->o_osd);
 379         if (list_empty(&osd->o_requests)) {
 380                 remove_osd(osdc, osd);
 381         } else {
 382                 ceph_con_close(&osd->o_con);
 383                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
 384                 osd->o_incarnation++;
 385         }
 386         return ret;
 387 }
 388
 389 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 390 {
 391         struct rb_node **p = &osdc->osds.rb_node;
 392         struct rb_node *parent = NULL;
 393         struct ceph_osd *osd = NULL;
 394
 395         while (*p) {
 396                 parent = *p;
 397                 osd = rb_entry(parent, struct ceph_osd, o_node);
 398                 if (new->o_osd < osd->o_osd)
 399                         p = &(*p)->rb_left;
 400                 else if (new->o_osd > osd->o_osd)
 401                         p = &(*p)->rb_right;
 402                 else
 403                         BUG();
 404         }
 405
 406         rb_link_node(&new->o_node, parent, p);
 407         rb_insert_color(&new->o_node, &osdc->osds);
 408 }
 409
 410 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 411 {
 412         struct ceph_osd *osd;
 413         struct rb_node *n = osdc->osds.rb_node;
 414
 415         while (n) {
 416                 osd = rb_entry(n, struct ceph_osd, o_node);
 417                 if (o < osd->o_osd)
 418                         n = n->rb_left;
 419                 else if (o > osd->o_osd)
 420                         n = n->rb_right;
 421                 else
 422                         return osd;
 423         }
 424         return NULL;
 425 }
 426
 427
 428 /*
 429  * Register request, assign tid.  If this is the first request, set up
 430  * the timeout event.
 431  */
 432 static void register_request(struct ceph_osd_client *osdc,
 433                              struct ceph_osd_request *req)
 434 {
 435         struct ceph_osd_request_head *head = req->r_request->front.iov_base;
 436
 437         mutex_lock(&osdc->request_mutex);
 438         req->r_tid = ++osdc->last_tid;
 439         head->tid = cpu_to_le64(req->r_tid);
 440
 441         dout("register_request %p tid %lld\n", req, req->r_tid);
 442         __insert_request(osdc, req);
 443         ceph_osdc_get_request(req);
 444         osdc->num_requests++;
 445
 446         req->r_timeout_stamp =
 447                 jiffies + osdc->client->mount_args->osd_timeout*HZ;
 448
 449         if (osdc->num_requests == 1) {
 450                 osdc->timeout_tid = req->r_tid;
 451                 dout("  timeout on tid %llu at %lu\n", req->r_tid,
 452                      req->r_timeout_stamp);
 453                 schedule_delayed_work(&osdc->timeout_work,
 454                       round_jiffies_relative(req->r_timeout_stamp - jiffies));
 455         }
 456         mutex_unlock(&osdc->request_mutex);
 457 }
 458
 459 /*
 460  * called under osdc->request_mutex
 461  */
 462 static void __unregister_request(struct ceph_osd_client *osdc,
 463                                  struct ceph_osd_request *req)
 464 {
 465         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 466         rb_erase(&req->r_node, &osdc->requests);
 467         osdc->num_requests--;
 468
 469         if (req->r_osd) {
 470                 /* make sure the original request isn't in flight. */
 471                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 472
 473                 list_del_init(&req->r_osd_item);
 474                 if (list_empty(&req->r_osd->o_requests))
 475                         remove_osd(osdc, req->r_osd);
 476                 req->r_osd = NULL;
 477         }
 478
 479         ceph_osdc_put_request(req);
 480
 481         if (req->r_tid == osdc->timeout_tid) {
 482                 if (osdc->num_requests == 0) {
 483                         dout("no requests, canceling timeout\n");
 484                         osdc->timeout_tid = 0;
 485                         cancel_delayed_work(&osdc->timeout_work);
 486                 } else {
 487                         req = rb_entry(rb_first(&osdc->requests),
 488                                        struct ceph_osd_request, r_node);
 489                         osdc->timeout_tid = req->r_tid;
 490                         dout("rescheduled timeout on tid %llu at %lu\n",
 491                              req->r_tid, req->r_timeout_stamp);
 492                         schedule_delayed_work(&osdc->timeout_work,
 493                               round_jiffies_relative(req->r_timeout_stamp -
 494                                                      jiffies));
 495                 }
 496         }
 497 }
 498
 499 /*
 500  * Cancel a previously queued request message
 501  */
 502 static void __cancel_request(struct ceph_osd_request *req)
 503 {
 504         if (req->r_sent) {
 505                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 506                 req->r_sent = 0;
 507         }
 508 }
 509
 510 /*
 511  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 512  * (as needed), and set the request r_osd appropriately.  If there is
 513  * no up osd, set r_osd to NULL.
 514  *
 515  * Return 0 if unchanged, 1 if changed, or negative on error.
 516  *
 517  * Caller should hold map_sem for read and request_mutex.
 518  */
 519 static int __map_osds(struct ceph_osd_client *osdc,
 520                       struct ceph_osd_request *req)
 521 {
 522         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 523         struct ceph_pg pgid;
 524         int o = -1;
 525         int err;
 526         struct ceph_osd *newosd = NULL;
 527
 528         dout("map_osds %p tid %lld\n", req, req->r_tid);
 529         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 530                                       &req->r_file_layout, osdc->osdmap);
 531         if (err)
 532                 return err;
 533         pgid = reqhead->layout.ol_pgid;
 534         o = ceph_calc_pg_primary(osdc->osdmap, pgid);
 535
 536         if ((req->r_osd && req->r_osd->o_osd == o &&
 537              req->r_sent >= req->r_osd->o_incarnation) ||
 538             (req->r_osd == NULL && o == -1))
 539                 return 0;  /* no change */
 540
 541         dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
 542              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 543              req->r_osd ? req->r_osd->o_osd : -1);
 544
 545         if (req->r_osd) {
 546                 __cancel_request(req);
 547                 list_del_init(&req->r_osd_item);
 548                 if (list_empty(&req->r_osd->o_requests)) {
 549                         /* try to re-use r_osd if possible */
 550                         newosd = get_osd(req->r_osd);
 551                         remove_osd(osdc, newosd);
 552                 }
 553                 req->r_osd = NULL;
 554         }
 555
 556         req->r_osd = __lookup_osd(osdc, o);
 557         if (!req->r_osd && o >= 0) {
 558                 if (newosd) {
 559                         req->r_osd = newosd;
 560                         newosd = NULL;
 561                 } else {
 562                         err = -ENOMEM;
 563                         req->r_osd = create_osd(osdc);
 564                         if (!req->r_osd)
 565                                 goto out;
 566                 }
 567
 568                 dout("map_osds osd %p is osd%d\n", req->r_osd, o);
 569                 req->r_osd->o_osd = o;
 570                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
 571                 __insert_osd(osdc, req->r_osd);
 572
 573                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
 574         }
 575
 576         if (req->r_osd)
 577                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 578         err = 1;   /* osd changed */
 579
 580 out:
 581         if (newosd)
 582                 put_osd(newosd);
 583         return err;
 584 }
 585
 586 /*
 587  * caller should hold map_sem (for read) and request_mutex
 588  */
 589 static int __send_request(struct ceph_osd_client *osdc,
 590                           struct ceph_osd_request *req)
 591 {
 592         struct ceph_osd_request_head *reqhead;
 593         int err;
 594
 595         err = __map_osds(osdc, req);
 596         if (err < 0)
 597                 return err;
 598         if (req->r_osd == NULL) {
 599                 dout("send_request %p no up osds in pg\n", req);
 600                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 601                 return 0;
 602         }
 603
 604         dout("send_request %p tid %llu to osd%d flags %d\n",
 605              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
 606
 607         reqhead = req->r_request->front.iov_base;
 608         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
 609         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
 610         reqhead->reassert_version = req->r_reassert_version;
 611
 612         req->r_timeout_stamp = jiffies+osdc->client->mount_args->osd_timeout*HZ;
 613
 614         ceph_msg_get(req->r_request); /* send consumes a ref */
 615         ceph_con_send(&req->r_osd->o_con, req->r_request);
 616         req->r_sent = req->r_osd->o_incarnation;
 617         return 0;
 618 }
 619
 620 /*
 621  * Timeout callback, called every N seconds when 1 or more osd
 622  * requests has been active for more than N seconds.  When this
 623  * happens, we ping all OSDs with requests who have timed out to
 624  * ensure any communications channel reset is detected.  Reset the
 625  * request timeouts another N seconds in the future as we go.
 626  * Reschedule the timeout event another N seconds in future (unless
 627  * there are no open requests).
 628  */
 629 static void handle_timeout(struct work_struct *work)
 630 {
 631         struct ceph_osd_client *osdc =
 632                 container_of(work, struct ceph_osd_client, timeout_work.work);
 633         struct ceph_osd_request *req;
 634         struct ceph_osd *osd;
 635         unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
 636         unsigned long next_timeout = timeout + jiffies;
 637         struct rb_node *p;
 638
 639         dout("timeout\n");
 640         down_read(&osdc->map_sem);
 641
 642         ceph_monc_request_next_osdmap(&osdc->client->monc);
 643
 644         mutex_lock(&osdc->request_mutex);
 645         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 646                 req = rb_entry(p, struct ceph_osd_request, r_node);
 647
 648                 if (req->r_resend) {
 649                         int err;
 650
 651                         dout("osdc resending prev failed %lld\n", req->r_tid);
 652                         err = __send_request(osdc, req);
 653                         if (err)
 654                                 dout("osdc failed again on %lld\n", req->r_tid);
 655                         else
 656                                 req->r_resend = false;
 657                         continue;
 658                 }
 659         }
 660         for (p = rb_first(&osdc->osds); p; p = rb_next(p)) {
 661                 osd = rb_entry(p, struct ceph_osd, o_node);
 662                 if (list_empty(&osd->o_requests))
 663                         continue;
 664                 req = list_first_entry(&osd->o_requests,
 665                                        struct ceph_osd_request, r_osd_item);
 666                 if (time_before(jiffies, req->r_timeout_stamp))
 667                         continue;
 668
 669                 dout(" tid %llu (at least) timed out on osd%d\n",
 670                      req->r_tid, osd->o_osd);
 671                 req->r_timeout_stamp = next_timeout;
 672                 ceph_con_keepalive(&osd->o_con);
 673         }
 674
 675         if (osdc->timeout_tid)
 676                 schedule_delayed_work(&osdc->timeout_work,
 677                                       round_jiffies_relative(timeout));
 678
 679         mutex_unlock(&osdc->request_mutex);
 680
 681         up_read(&osdc->map_sem);
 682 }
 683
 684 /*
 685  * handle osd op reply.  either call the callback if it is specified,
 686  * or do the completion to wake up the waiting thread.
 687  */
 688 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 689 {
 690         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
 691         struct ceph_osd_request *req;
 692         u64 tid;
 693         int numops, object_len, flags;
 694
 695         if (msg->front.iov_len < sizeof(*rhead))
 696                 goto bad;
 697         tid = le64_to_cpu(rhead->tid);
 698         numops = le32_to_cpu(rhead->num_ops);
 699         object_len = le32_to_cpu(rhead->object_len);
 700         if (msg->front.iov_len != sizeof(*rhead) + object_len +
 701             numops * sizeof(struct ceph_osd_op))
 702                 goto bad;
 703         dout("handle_reply %p tid %llu\n", msg, tid);
 704
 705         /* lookup */
 706         mutex_lock(&osdc->request_mutex);
 707         req = __lookup_request(osdc, tid);
 708         if (req == NULL) {
 709                 dout("handle_reply tid %llu dne\n", tid);
 710                 mutex_unlock(&osdc->request_mutex);
 711                 return;
 712         }
 713         ceph_osdc_get_request(req);
 714         flags = le32_to_cpu(rhead->flags);
 715
 716         if (req->r_reply) {
 717                 /*
 718                  * once we see the message has been received, we don't
 719                  * need a ref (which is only needed for revoking
 720                  * pages)
 721                  */
 722                 ceph_msg_put(req->r_reply);
 723                 req->r_reply = NULL;
 724         }
 725
 726         if (!req->r_got_reply) {
 727                 unsigned bytes;
 728
 729                 req->r_result = le32_to_cpu(rhead->result);
 730                 bytes = le32_to_cpu(msg->hdr.data_len);
 731                 dout("handle_reply result %d bytes %d\n", req->r_result,
 732                      bytes);
 733                 if (req->r_result == 0)
 734                         req->r_result = bytes;
 735
 736                 /* in case this is a write and we need to replay, */
 737                 req->r_reassert_version = rhead->reassert_version;
 738
 739                 req->r_got_reply = 1;
 740         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
 741                 dout("handle_reply tid %llu dup ack\n", tid);
 742                 goto done;
 743         }
 744
 745         dout("handle_reply tid %llu flags %d\n", tid, flags);
 746
 747         /* either this is a read, or we got the safe response */
 748         if ((flags & CEPH_OSD_FLAG_ONDISK) ||
 749             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
 750                 __unregister_request(osdc, req);
 751
 752         mutex_unlock(&osdc->request_mutex);
 753
 754         if (req->r_callback)
 755                 req->r_callback(req, msg);
 756         else
 757                 complete(&req->r_completion);
 758
 759         if (flags & CEPH_OSD_FLAG_ONDISK) {
 760                 if (req->r_safe_callback)
 761                         req->r_safe_callback(req, msg);
 762                 complete(&req->r_safe_completion);  /* fsync waiter */
 763         }
 764
 765 done:
 766         ceph_osdc_put_request(req);
 767         return;
 768
 769 bad:
 770         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
 771                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
 772                (int)sizeof(*rhead));
 773 }
 774
 775
 776 /*
 777  * Resubmit osd requests whose osd or osd address has changed.  Request
 778  * a new osd map if osds are down, or we are otherwise unable to determine
 779  * how to direct a request.
 780  *
 781  * Close connections to down osds.
 782  *
 783  * If @who is specified, resubmit requests for that specific osd.
 784  *
 785  * Caller should hold map_sem for read and request_mutex.
 786  */
 787 static void kick_requests(struct ceph_osd_client *osdc,
 788                           struct ceph_osd *kickosd)
 789 {
 790         struct ceph_osd_request *req;
 791         struct rb_node *p, *n;
 792         int needmap = 0;
 793         int err;
 794
 795         dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
 796         mutex_lock(&osdc->request_mutex);
 797         if (!kickosd) {
 798                 for (p = rb_first(&osdc->osds); p; p = n) {
 799                         struct ceph_osd *osd =
 800                                 rb_entry(p, struct ceph_osd, o_node);
 801
 802                         n = rb_next(p);
 803                         if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
 804                             !ceph_entity_addr_equal(&osd->o_con.peer_addr,
 805                                             ceph_osd_addr(osdc->osdmap,
 806                                                           osd->o_osd)))
 807                                 reset_osd(osdc, osd);
 808                 }
 809         }
 810
 811         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 812                 req = rb_entry(p, struct ceph_osd_request, r_node);
 813
 814                 if (req->r_resend) {
 815                         dout(" r_resend set on tid %llu\n", req->r_tid);
 816                         __cancel_request(req);
 817                         goto kick;
 818                 }
 819                 if (req->r_osd && kickosd == req->r_osd) {
 820                         __cancel_request(req);
 821                         goto kick;
 822                 }
 823
 824                 err = __map_osds(osdc, req);
 825                 if (err == 0)
 826                         continue;  /* no change */
 827                 if (err < 0) {
 828                         /*
 829                          * FIXME: really, we should set the request
 830                          * error and fail if this isn't a 'nofail'
 831                          * request, but that's a fair bit more
 832                          * complicated to do.  So retry!
 833                          */
 834                         dout(" setting r_resend on %llu\n", req->r_tid);
 835                         req->r_resend = true;
 836                         continue;
 837                 }
 838                 if (req->r_osd == NULL) {
 839                         dout("tid %llu maps to no valid osd\n", req->r_tid);
 840                         needmap++;  /* request a newer map */
 841                         continue;
 842                 }
 843
 844 kick:
 845                 dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
 846                      req->r_osd->o_osd);
 847                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
 848                 err = __send_request(osdc, req);
 849                 if (err) {
 850                         dout(" setting r_resend on %llu\n", req->r_tid);
 851                         req->r_resend = true;
 852                 }
 853         }
 854         mutex_unlock(&osdc->request_mutex);
 855
 856         if (needmap) {
 857                 dout("%d requests for down osds, need new map\n", needmap);
 858                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 859         }
 860 }
 861
 862 /*
 863  * Process updated osd map.
 864  *
 865  * The message contains any number of incremental and full maps, normally
 866  * indicating some sort of topology change in the cluster.  Kick requests
 867  * off to different OSDs as needed.
 868  */
 869 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 870 {
 871         void *p, *end, *next;
 872         u32 nr_maps, maplen;
 873         u32 epoch;
 874         struct ceph_osdmap *newmap = NULL, *oldmap;
 875         int err;
 876         struct ceph_fsid fsid;
 877
 878         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
 879         p = msg->front.iov_base;
 880         end = p + msg->front.iov_len;
 881
 882         /* verify fsid */
 883         ceph_decode_need(&p, end, sizeof(fsid), bad);
 884         ceph_decode_copy(&p, &fsid, sizeof(fsid));
 885         if (ceph_check_fsid(osdc->client, &fsid) < 0)
 886                 return;
 887
 888         down_write(&osdc->map_sem);
 889
 890         /* incremental maps */
 891         ceph_decode_32_safe(&p, end, nr_maps, bad);
 892         dout(" %d inc maps\n", nr_maps);
 893         while (nr_maps > 0) {
 894                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
 895                 epoch = ceph_decode_32(&p);
 896                 maplen = ceph_decode_32(&p);
 897                 ceph_decode_need(&p, end, maplen, bad);
 898                 next = p + maplen;
 899                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
 900                         dout("applying incremental map %u len %d\n",
 901                              epoch, maplen);
 902                         newmap = osdmap_apply_incremental(&p, next,
 903                                                           osdc->osdmap,
 904                                                           osdc->client->msgr);
 905                         if (IS_ERR(newmap)) {
 906                                 err = PTR_ERR(newmap);
 907                                 goto bad;
 908                         }
 909                         if (newmap != osdc->osdmap) {
 910                                 ceph_osdmap_destroy(osdc->osdmap);
 911                                 osdc->osdmap = newmap;
 912                         }
 913                 } else {
 914                         dout("ignoring incremental map %u len %d\n",
 915                              epoch, maplen);
 916                 }
 917                 p = next;
 918                 nr_maps--;
 919         }
 920         if (newmap)
 921                 goto done;
 922
 923         /* full maps */
 924         ceph_decode_32_safe(&p, end, nr_maps, bad);
 925         dout(" %d full maps\n", nr_maps);
 926         while (nr_maps) {
 927                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
 928                 epoch = ceph_decode_32(&p);
 929                 maplen = ceph_decode_32(&p);
 930                 ceph_decode_need(&p, end, maplen, bad);
 931                 if (nr_maps > 1) {
 932                         dout("skipping non-latest full map %u len %d\n",
 933                              epoch, maplen);
 934                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
 935                         dout("skipping full map %u len %d, "
 936                              "older than our %u\n", epoch, maplen,
 937                              osdc->osdmap->epoch);
 938                 } else {
 939                         dout("taking full map %u len %d\n", epoch, maplen);
 940                         newmap = osdmap_decode(&p, p+maplen);
 941                         if (IS_ERR(newmap)) {
 942                                 err = PTR_ERR(newmap);
 943                                 goto bad;
 944                         }
 945                         oldmap = osdc->osdmap;
 946                         osdc->osdmap = newmap;
 947                         if (oldmap)
 948                                 ceph_osdmap_destroy(oldmap);
 949                 }
 950                 p += maplen;
 951                 nr_maps--;
 952         }
 953
 954 done:
 955         downgrade_write(&osdc->map_sem);
 956         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
 957         if (newmap)
 958                 kick_requests(osdc, NULL);
 959         up_read(&osdc->map_sem);
 960         return;
 961
 962 bad:
 963         pr_err("osdc handle_map corrupt msg\n");
 964         up_write(&osdc->map_sem);
 965         return;
 966 }
 967
 968
 969 /*
 970  * A read request prepares specific pages that data is to be read into.
 971  * When a message is being read off the wire, we call prepare_pages to
 972  * find those pages.
 973  *  0 = success, -1 failure.
 974  */
 975 static int prepare_pages(struct ceph_connection *con, struct ceph_msg *m,
 976                          int want)
 977 {
 978         struct ceph_osd *osd = con->private;
 979         struct ceph_osd_client *osdc;
 980         struct ceph_osd_reply_head *rhead = m->front.iov_base;
 981         struct ceph_osd_request *req;
 982         u64 tid;
 983         int ret = -1;
 984         int type = le16_to_cpu(m->hdr.type);
 985
 986         if (!osd)
 987                 return -1;
 988         osdc = osd->o_osdc;
 989
 990         dout("prepare_pages on msg %p want %d\n", m, want);
 991         if (unlikely(type != CEPH_MSG_OSD_OPREPLY))
 992                 return -1;  /* hmm! */
 993
 994         tid = le64_to_cpu(rhead->tid);
 995         mutex_lock(&osdc->request_mutex);
 996         req = __lookup_request(osdc, tid);
 997         if (!req) {
 998                 dout("prepare_pages unknown tid %llu\n", tid);
 999                 goto out;
1000         }
1001         dout("prepare_pages tid %llu has %d pages, want %d\n",
1002              tid, req->r_num_pages, want);
1003         if (likely(req->r_num_pages >= want && !req->r_prepared_pages)) {
1004                 m->pages = req->r_pages;
1005                 m->nr_pages = req->r_num_pages;
1006                 req->r_reply = m;  /* only for duration of read over socket */
1007                 ceph_msg_get(m);
1008                 req->r_prepared_pages = 1;
1009                 ret = 0; /* success */
1010         }
1011 out:
1012         mutex_unlock(&osdc->request_mutex);
1013         return ret;
1014 }
1015
1016 /*
1017  * Register request, send initial attempt.
1018  */
1019 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1020                             struct ceph_osd_request *req,
1021                             bool nofail)
1022 {
1023         int rc = 0;
1024
1025         req->r_request->pages = req->r_pages;
1026         req->r_request->nr_pages = req->r_num_pages;
1027
1028         register_request(osdc, req);
1029
1030         down_read(&osdc->map_sem);
1031         mutex_lock(&osdc->request_mutex);
1032         /*
1033          * a racing kick_requests() may have sent the message for us
1034          * while we dropped request_mutex above, so only send now if
1035          * the request still han't been touched yet.
1036          */
1037         if (req->r_sent == 0) {
1038                 rc = __send_request(osdc, req);
1039                 if (rc) {
1040                         if (nofail) {
1041                                 dout("osdc_start_request failed send, "
1042                                      " marking %lld\n", req->r_tid);
1043                                 req->r_resend = true;
1044                                 rc = 0;
1045                         } else {
1046                                 __unregister_request(osdc, req);
1047                         }
1048                 }
1049         }
1050         mutex_unlock(&osdc->request_mutex);
1051         up_read(&osdc->map_sem);
1052         return rc;
1053 }
1054
1055 /*
1056  * wait for a request to complete
1057  */
1058 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1059                            struct ceph_osd_request *req)
1060 {
1061         int rc;
1062
1063         rc = wait_for_completion_interruptible(&req->r_completion);
1064         if (rc < 0) {
1065                 mutex_lock(&osdc->request_mutex);
1066                 __cancel_request(req);
1067                 mutex_unlock(&osdc->request_mutex);
1068                 dout("wait_request tid %llu timed out\n", req->r_tid);
1069                 return rc;
1070         }
1071
1072         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1073         return req->r_result;
1074 }
1075
1076 /*
1077  * sync - wait for all in-flight requests to flush.  avoid starvation.
1078  */
1079 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1080 {
1081         struct ceph_osd_request *req;
1082         u64 last_tid, next_tid = 0;
1083
1084         mutex_lock(&osdc->request_mutex);
1085         last_tid = osdc->last_tid;
1086         while (1) {
1087                 req = __lookup_request_ge(osdc, next_tid);
1088                 if (!req)
1089                         break;
1090                 if (req->r_tid > last_tid)
1091                         break;
1092
1093                 next_tid = req->r_tid + 1;
1094                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1095                         continue;
1096
1097                 ceph_osdc_get_request(req);
1098                 mutex_unlock(&osdc->request_mutex);
1099                 dout("sync waiting on tid %llu (last is %llu)\n",
1100                      req->r_tid, last_tid);
1101                 wait_for_completion(&req->r_safe_completion);
1102                 mutex_lock(&osdc->request_mutex);
1103                 ceph_osdc_put_request(req);
1104         }
1105         mutex_unlock(&osdc->request_mutex);
1106         dout("sync done (thru tid %llu)\n", last_tid);
1107 }
1108
1109 /*
1110  * init, shutdown
1111  */
1112 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1113 {
1114         int err;
1115
1116         dout("init\n");
1117         osdc->client = client;
1118         osdc->osdmap = NULL;
1119         init_rwsem(&osdc->map_sem);
1120         init_completion(&osdc->map_waiters);
1121         osdc->last_requested_map = 0;
1122         mutex_init(&osdc->request_mutex);
1123         osdc->timeout_tid = 0;
1124         osdc->last_tid = 0;
1125         osdc->osds = RB_ROOT;
1126         osdc->requests = RB_ROOT;
1127         osdc->num_requests = 0;
1128         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1129
1130         err = -ENOMEM;
1131         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1132                                         sizeof(struct ceph_osd_request));
1133         if (!osdc->req_mempool)
1134                 goto out;
1135
1136         err = ceph_msgpool_init(&osdc->msgpool_op, 4096, 10, true);
1137         if (err < 0)
1138                 goto out_mempool;
1139         err = ceph_msgpool_init(&osdc->msgpool_op_reply, 512, 0, false);
1140         if (err < 0)
1141                 goto out_msgpool;
1142         return 0;
1143
1144 out_msgpool:
1145         ceph_msgpool_destroy(&osdc->msgpool_op);
1146 out_mempool:
1147         mempool_destroy(osdc->req_mempool);
1148 out:
1149         return err;
1150 }
1151
1152 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1153 {
1154         cancel_delayed_work_sync(&osdc->timeout_work);
1155         if (osdc->osdmap) {
1156                 ceph_osdmap_destroy(osdc->osdmap);
1157                 osdc->osdmap = NULL;
1158         }
1159         mempool_destroy(osdc->req_mempool);
1160         ceph_msgpool_destroy(&osdc->msgpool_op);
1161         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1162 }
1163
1164 /*
1165  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1166  * *plen.  Return number of bytes read, or error.
1167  */
1168 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1169                         struct ceph_vino vino, struct ceph_file_layout *layout,
1170                         u64 off, u64 *plen,
1171                         u32 truncate_seq, u64 truncate_size,
1172                         struct page **pages, int num_pages)
1173 {
1174         struct ceph_osd_request *req;
1175         int rc = 0;
1176
1177         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1178              vino.snap, off, *plen);
1179         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1180                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1181                                     NULL, 0, truncate_seq, truncate_size, NULL,
1182                                     false, 1);
1183         if (IS_ERR(req))
1184                 return PTR_ERR(req);
1185
1186         /* it may be a short read due to an object boundary */
1187         req->r_pages = pages;
1188         num_pages = calc_pages_for(off, *plen);
1189         req->r_num_pages = num_pages;
1190
1191         dout("readpages  final extent is %llu~%llu (%d pages)\n",
1192              off, *plen, req->r_num_pages);
1193
1194         rc = ceph_osdc_start_request(osdc, req, false);
1195         if (!rc)
1196                 rc = ceph_osdc_wait_request(osdc, req);
1197
1198         ceph_osdc_put_request(req);
1199         dout("readpages result %d\n", rc);
1200         return rc;
1201 }
1202
1203 /*
1204  * do a synchronous write on N pages
1205  */
1206 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1207                          struct ceph_file_layout *layout,
1208                          struct ceph_snap_context *snapc,
1209                          u64 off, u64 len,
1210                          u32 truncate_seq, u64 truncate_size,
1211                          struct timespec *mtime,
1212                          struct page **pages, int num_pages,
1213                          int flags, int do_sync, bool nofail)
1214 {
1215         struct ceph_osd_request *req;
1216         int rc = 0;
1217
1218         BUG_ON(vino.snap != CEPH_NOSNAP);
1219         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1220                                     CEPH_OSD_OP_WRITE,
1221                                     flags | CEPH_OSD_FLAG_ONDISK |
1222                                             CEPH_OSD_FLAG_WRITE,
1223                                     snapc, do_sync,
1224                                     truncate_seq, truncate_size, mtime,
1225                                     nofail, 1);
1226         if (IS_ERR(req))
1227                 return PTR_ERR(req);
1228
1229         /* it may be a short write due to an object boundary */
1230         req->r_pages = pages;
1231         req->r_num_pages = calc_pages_for(off, len);
1232         dout("writepages %llu~%llu (%d pages)\n", off, len,
1233              req->r_num_pages);
1234
1235         rc = ceph_osdc_start_request(osdc, req, nofail);
1236         if (!rc)
1237                 rc = ceph_osdc_wait_request(osdc, req);
1238
1239         ceph_osdc_put_request(req);
1240         if (rc == 0)
1241                 rc = len;
1242         dout("writepages result %d\n", rc);
1243         return rc;
1244 }
1245
1246 /*
1247  * handle incoming message
1248  */
1249 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1250 {
1251         struct ceph_osd *osd = con->private;
1252         struct ceph_osd_client *osdc;
1253         int type = le16_to_cpu(msg->hdr.type);
1254
1255         if (!osd)
1256                 return;
1257         osdc = osd->o_osdc;
1258
1259         switch (type) {
1260         case CEPH_MSG_OSD_MAP:
1261                 ceph_osdc_handle_map(osdc, msg);
1262                 break;
1263         case CEPH_MSG_OSD_OPREPLY:
1264                 handle_reply(osdc, msg);
1265                 break;
1266
1267         default:
1268                 pr_err("received unknown message type %d %s\n", type,
1269                        ceph_msg_type_name(type));
1270         }
1271         ceph_msg_put(msg);
1272 }
1273
1274 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
1275                                   struct ceph_msg_header *hdr)
1276 {
1277         struct ceph_osd *osd = con->private;
1278         struct ceph_osd_client *osdc = osd->o_osdc;
1279         int type = le16_to_cpu(hdr->type);
1280         int front = le32_to_cpu(hdr->front_len);
1281
1282         switch (type) {
1283         case CEPH_MSG_OSD_OPREPLY:
1284                 return ceph_msgpool_get(&osdc->msgpool_op_reply, front);
1285         }
1286         return ceph_alloc_msg(con, hdr);
1287 }
1288
1289 /*
1290  * Wrappers to refcount containing ceph_osd struct
1291  */
1292 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
1293 {
1294         struct ceph_osd *osd = con->private;
1295         if (get_osd(osd))
1296                 return con;
1297         return NULL;
1298 }
1299
1300 static void put_osd_con(struct ceph_connection *con)
1301 {
1302         struct ceph_osd *osd = con->private;
1303         put_osd(osd);
1304 }
1305
1306 /*
1307  * authentication
1308  */
1309 static int get_authorizer(struct ceph_connection *con,
1310                           void **buf, int *len, int *proto,
1311                           void **reply_buf, int *reply_len, int force_new)
1312 {
1313         struct ceph_osd *o = con->private;
1314         struct ceph_osd_client *osdc = o->o_osdc;
1315         struct ceph_auth_client *ac = osdc->client->monc.auth;
1316         int ret = 0;
1317
1318         if (force_new && o->o_authorizer) {
1319                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
1320                 o->o_authorizer = NULL;
1321         }
1322         if (o->o_authorizer == NULL) {
1323                 ret = ac->ops->create_authorizer(
1324                         ac, CEPH_ENTITY_TYPE_OSD,
1325                         &o->o_authorizer,
1326                         &o->o_authorizer_buf,
1327                         &o->o_authorizer_buf_len,
1328                         &o->o_authorizer_reply_buf,
1329                         &o->o_authorizer_reply_buf_len);
1330                 if (ret)
1331                 return ret;
1332         }
1333
1334         *proto = ac->protocol;
1335         *buf = o->o_authorizer_buf;
1336         *len = o->o_authorizer_buf_len;
1337         *reply_buf = o->o_authorizer_reply_buf;
1338         *reply_len = o->o_authorizer_reply_buf_len;
1339         return 0;
1340 }
1341
1342
1343 static int verify_authorizer_reply(struct ceph_connection *con, int len)
1344 {
1345         struct ceph_osd *o = con->private;
1346         struct ceph_osd_client *osdc = o->o_osdc;
1347         struct ceph_auth_client *ac = osdc->client->monc.auth;
1348
1349         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
1350 }
1351
1352
1353 const static struct ceph_connection_operations osd_con_ops = {
1354         .get = get_osd_con,
1355         .put = put_osd_con,
1356         .dispatch = dispatch,
1357         .get_authorizer = get_authorizer,
1358         .verify_authorizer_reply = verify_authorizer_reply,
1359         .alloc_msg = alloc_msg,
1360         .fault = osd_reset,
1361         .alloc_middle = ceph_alloc_middle,
1362         .prepare_pages = prepare_pages,
1363 };