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 #define OSD_REPLY_RESERVE_FRONT_LEN     512
  17
  18 const static struct ceph_connection_operations osd_con_ops;
  19
  20 static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  21
  22 /*
  23  * Implement client access to distributed object storage cluster.
  24  *
  25  * All data objects are stored within a cluster/cloud of OSDs, or
  26  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  27  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  28  * remote daemons serving up and coordinating consistent and safe
  29  * access to storage.
  30  *
  31  * Cluster membership and the mapping of data objects onto storage devices
  32  * are described by the osd map.
  33  *
  34  * We keep track of pending OSD requests (read, write), resubmit
  35  * requests to different OSDs when the cluster topology/data layout
  36  * change, or retry the affected requests when the communications
  37  * channel with an OSD is reset.
  38  */
  39
  40 /*
  41  * calculate the mapping of a file extent onto an object, and fill out the
  42  * request accordingly.  shorten extent as necessary if it crosses an
  43  * object boundary.
  44  *
  45  * fill osd op in request message.
  46  */
  47 static void calc_layout(struct ceph_osd_client *osdc,
  48                         struct ceph_vino vino, struct ceph_file_layout *layout,
  49                         u64 off, u64 *plen,
  50                         struct ceph_osd_request *req)
  51 {
  52         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
  53         struct ceph_osd_op *op = (void *)(reqhead + 1);
  54         u64 orig_len = *plen;
  55         u64 objoff, objlen;    /* extent in object */
  56         u64 bno;
  57
  58         reqhead->snapid = cpu_to_le64(vino.snap);
  59
  60         /* object extent? */
  61         ceph_calc_file_object_mapping(layout, off, plen, &bno,
  62                                       &objoff, &objlen);
  63         if (*plen < orig_len)
  64                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  65                      orig_len - *plen, off, *plen);
  66
  67         sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
  68         req->r_oid_len = strlen(req->r_oid);
  69
  70         op->extent.offset = cpu_to_le64(objoff);
  71         op->extent.length = cpu_to_le64(objlen);
  72         req->r_num_pages = calc_pages_for(off, *plen);
  73
  74         dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
  75              req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
  76 }
  77
  78 static void remove_replies(struct ceph_osd_request *req)
  79 {
  80         int i;
  81         int max = ARRAY_SIZE(req->replies);
  82
  83         for (i=0; i<max; i++) {
  84                 if (req->replies[i])
  85                         ceph_msg_put(req->replies[i]);
  86         }
  87 }
  88
  89 /*
  90  * requests
  91  */
  92 void ceph_osdc_release_request(struct kref *kref)
  93 {
  94         struct ceph_osd_request *req = container_of(kref,
  95                                                     struct ceph_osd_request,
  96                                                     r_kref);
  97
  98         if (req->r_request)
  99                 ceph_msg_put(req->r_request);
 100         if (req->r_reply)
 101                 ceph_msg_put(req->r_reply);
 102         remove_replies(req);
 103         if (req->r_con_filling_msg) {
 104                 dout("release_request revoking pages %p from con %p\n",
 105                      req->r_pages, req->r_con_filling_msg);
 106                 ceph_con_revoke_message(req->r_con_filling_msg,
 107                                       req->r_reply);
 108                 ceph_con_put(req->r_con_filling_msg);
 109         }
 110         if (req->r_own_pages)
 111                 ceph_release_page_vector(req->r_pages,
 112                                          req->r_num_pages);
 113         ceph_put_snap_context(req->r_snapc);
 114         if (req->r_mempool)
 115                 mempool_free(req, req->r_osdc->req_mempool);
 116         else
 117                 kfree(req);
 118 }
 119
 120 static int alloc_replies(struct ceph_osd_request *req, int num_reply)
 121 {
 122         int i;
 123         int max = ARRAY_SIZE(req->replies);
 124
 125         BUG_ON(num_reply > max);
 126
 127         for (i=0; i<num_reply; i++) {
 128                 req->replies[i] = ceph_msg_new(0, OSD_REPLY_RESERVE_FRONT_LEN, 0, 0, NULL);
 129                 if (IS_ERR(req->replies[i])) {
 130                         int j;
 131                         int err = PTR_ERR(req->replies[i]);
 132                         for (j = 0; j<=i; j++) {
 133                                 ceph_msg_put(req->replies[j]);
 134                         }
 135                         return err;
 136                 }
 137         }
 138
 139         for (; i<max; i++) {
 140                 req->replies[i] = NULL;
 141         }
 142
 143         req->cur_reply = 0;
 144
 145         return 0;
 146 }
 147
 148 static struct ceph_msg *__get_next_reply(struct ceph_connection *con,
 149                                        struct ceph_osd_request *req,
 150                                        int front_len)
 151 {
 152         struct ceph_msg *reply;
 153         if (req->r_con_filling_msg) {
 154                 dout("revoking reply msg %p from old con %p\n", req->r_reply,
 155                      req->r_con_filling_msg);
 156                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
 157                 ceph_con_put(req->r_con_filling_msg);
 158                 req->cur_reply = 0;
 159         }
 160         reply = req->replies[req->cur_reply];
 161         if (!reply || front_len > OSD_REPLY_RESERVE_FRONT_LEN) {
 162                 /* maybe we can allocate it now? */
 163                 reply = ceph_msg_new(0, front_len, 0, 0, NULL);
 164                 if (!reply || IS_ERR(reply)) {
 165                         pr_err(" reply alloc failed, front_len=%d\n", front_len);
 166                         return ERR_PTR(-ENOMEM);
 167                 }
 168         }
 169         req->r_con_filling_msg = ceph_con_get(con);
 170         req->r_reply = ceph_msg_get(reply); /* for duration of read over socket */
 171         return ceph_msg_get(reply);
 172 }
 173
 174 /*
 175  * build new request AND message, calculate layout, and adjust file
 176  * extent as needed.
 177  *
 178  * if the file was recently truncated, we include information about its
 179  * old and new size so that the object can be updated appropriately.  (we
 180  * avoid synchronously deleting truncated objects because it's slow.)
 181  *
 182  * if @do_sync, include a 'startsync' command so that the osd will flush
 183  * data quickly.
 184  */
 185 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 186                                                struct ceph_file_layout *layout,
 187                                                struct ceph_vino vino,
 188                                                u64 off, u64 *plen,
 189                                                int opcode, int flags,
 190                                                struct ceph_snap_context *snapc,
 191                                                int do_sync,
 192                                                u32 truncate_seq,
 193                                                u64 truncate_size,
 194                                                struct timespec *mtime,
 195                                                bool use_mempool, int num_reply)
 196 {
 197         struct ceph_osd_request *req;
 198         struct ceph_msg *msg;
 199         struct ceph_osd_request_head *head;
 200         struct ceph_osd_op *op;
 201         void *p;
 202         int num_op = 1 + do_sync;
 203         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 204         int err, i;
 205
 206         if (use_mempool) {
 207                 req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
 208                 memset(req, 0, sizeof(*req));
 209         } else {
 210                 req = kzalloc(sizeof(*req), GFP_NOFS);
 211         }
 212         if (req == NULL)
 213                 return ERR_PTR(-ENOMEM);
 214
 215         err = alloc_replies(req, num_reply);
 216         if (err) {
 217                 ceph_osdc_put_request(req);
 218                 return ERR_PTR(-ENOMEM);
 219         }
 220         req->r_num_prealloc_reply = num_reply;
 221
 222         req->r_osdc = osdc;
 223         req->r_mempool = use_mempool;
 224         kref_init(&req->r_kref);
 225         init_completion(&req->r_completion);
 226         init_completion(&req->r_safe_completion);
 227         INIT_LIST_HEAD(&req->r_unsafe_item);
 228         req->r_flags = flags;
 229
 230         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
 231
 232         /* create message; allow space for oid */
 233         msg_size += 40;
 234         if (snapc)
 235                 msg_size += sizeof(u64) * snapc->num_snaps;
 236         if (use_mempool)
 237                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 238         else
 239                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
 240         if (IS_ERR(msg)) {
 241                 ceph_osdc_put_request(req);
 242                 return ERR_PTR(PTR_ERR(msg));
 243         }
 244         msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
 245         memset(msg->front.iov_base, 0, msg->front.iov_len);
 246         head = msg->front.iov_base;
 247         op = (void *)(head + 1);
 248         p = (void *)(op + num_op);
 249
 250         req->r_request = msg;
 251         req->r_snapc = ceph_get_snap_context(snapc);
 252
 253         head->client_inc = cpu_to_le32(1); /* always, for now. */
 254         head->flags = cpu_to_le32(flags);
 255         if (flags & CEPH_OSD_FLAG_WRITE)
 256                 ceph_encode_timespec(&head->mtime, mtime);
 257         head->num_ops = cpu_to_le16(num_op);
 258         op->op = cpu_to_le16(opcode);
 259
 260         /* calculate max write size */
 261         calc_layout(osdc, vino, layout, off, plen, req);
 262         req->r_file_layout = *layout;  /* keep a copy */
 263
 264         if (flags & CEPH_OSD_FLAG_WRITE) {
 265                 req->r_request->hdr.data_off = cpu_to_le16(off);
 266                 req->r_request->hdr.data_len = cpu_to_le32(*plen);
 267                 op->payload_len = cpu_to_le32(*plen);
 268         }
 269         op->extent.truncate_size = cpu_to_le64(truncate_size);
 270         op->extent.truncate_seq = cpu_to_le32(truncate_seq);
 271
 272         /* fill in oid */
 273         head->object_len = cpu_to_le32(req->r_oid_len);
 274         memcpy(p, req->r_oid, req->r_oid_len);
 275         p += req->r_oid_len;
 276
 277         if (do_sync) {
 278                 op++;
 279                 op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC);
 280         }
 281         if (snapc) {
 282                 head->snap_seq = cpu_to_le64(snapc->seq);
 283                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
 284                 for (i = 0; i < snapc->num_snaps; i++) {
 285                         put_unaligned_le64(snapc->snaps[i], p);
 286                         p += sizeof(u64);
 287                 }
 288         }
 289
 290         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
 291         return req;
 292 }
 293
 294 /*
 295  * We keep osd requests in an rbtree, sorted by ->r_tid.
 296  */
 297 static void __insert_request(struct ceph_osd_client *osdc,
 298                              struct ceph_osd_request *new)
 299 {
 300         struct rb_node **p = &osdc->requests.rb_node;
 301         struct rb_node *parent = NULL;
 302         struct ceph_osd_request *req = NULL;
 303
 304         while (*p) {
 305                 parent = *p;
 306                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 307                 if (new->r_tid < req->r_tid)
 308                         p = &(*p)->rb_left;
 309                 else if (new->r_tid > req->r_tid)
 310                         p = &(*p)->rb_right;
 311                 else
 312                         BUG();
 313         }
 314
 315         rb_link_node(&new->r_node, parent, p);
 316         rb_insert_color(&new->r_node, &osdc->requests);
 317 }
 318
 319 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 320                                                  u64 tid)
 321 {
 322         struct ceph_osd_request *req;
 323         struct rb_node *n = osdc->requests.rb_node;
 324
 325         while (n) {
 326                 req = rb_entry(n, struct ceph_osd_request, r_node);
 327                 if (tid < req->r_tid)
 328                         n = n->rb_left;
 329                 else if (tid > req->r_tid)
 330                         n = n->rb_right;
 331                 else
 332                         return req;
 333         }
 334         return NULL;
 335 }
 336
 337 static struct ceph_osd_request *
 338 __lookup_request_ge(struct ceph_osd_client *osdc,
 339                     u64 tid)
 340 {
 341         struct ceph_osd_request *req;
 342         struct rb_node *n = osdc->requests.rb_node;
 343
 344         while (n) {
 345                 req = rb_entry(n, struct ceph_osd_request, r_node);
 346                 if (tid < req->r_tid) {
 347                         if (!n->rb_left)
 348                                 return req;
 349                         n = n->rb_left;
 350                 } else if (tid > req->r_tid) {
 351                         n = n->rb_right;
 352                 } else {
 353                         return req;
 354                 }
 355         }
 356         return NULL;
 357 }
 358
 359
 360 /*
 361  * If the osd connection drops, we need to resubmit all requests.
 362  */
 363 static void osd_reset(struct ceph_connection *con)
 364 {
 365         struct ceph_osd *osd = con->private;
 366         struct ceph_osd_client *osdc;
 367
 368         if (!osd)
 369                 return;
 370         dout("osd_reset osd%d\n", osd->o_osd);
 371         osdc = osd->o_osdc;
 372         down_read(&osdc->map_sem);
 373         kick_requests(osdc, osd);
 374         up_read(&osdc->map_sem);
 375 }
 376
 377 /*
 378  * Track open sessions with osds.
 379  */
 380 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
 381 {
 382         struct ceph_osd *osd;
 383
 384         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 385         if (!osd)
 386                 return NULL;
 387
 388         atomic_set(&osd->o_ref, 1);
 389         osd->o_osdc = osdc;
 390         INIT_LIST_HEAD(&osd->o_requests);
 391         INIT_LIST_HEAD(&osd->o_osd_lru);
 392         osd->o_incarnation = 1;
 393
 394         ceph_con_init(osdc->client->msgr, &osd->o_con);
 395         osd->o_con.private = osd;
 396         osd->o_con.ops = &osd_con_ops;
 397         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
 398
 399         return osd;
 400 }
 401
 402 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 403 {
 404         if (atomic_inc_not_zero(&osd->o_ref)) {
 405                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 406                      atomic_read(&osd->o_ref));
 407                 return osd;
 408         } else {
 409                 dout("get_osd %p FAIL\n", osd);
 410                 return NULL;
 411         }
 412 }
 413
 414 static void put_osd(struct ceph_osd *osd)
 415 {
 416         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 417              atomic_read(&osd->o_ref) - 1);
 418         if (atomic_dec_and_test(&osd->o_ref))
 419                 kfree(osd);
 420 }
 421
 422 /*
 423  * remove an osd from our map
 424  */
 425 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 426 {
 427         dout("__remove_osd %p\n", osd);
 428         BUG_ON(!list_empty(&osd->o_requests));
 429         rb_erase(&osd->o_node, &osdc->osds);
 430         list_del_init(&osd->o_osd_lru);
 431         ceph_con_close(&osd->o_con);
 432         put_osd(osd);
 433 }
 434
 435 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 436                               struct ceph_osd *osd)
 437 {
 438         dout("__move_osd_to_lru %p\n", osd);
 439         BUG_ON(!list_empty(&osd->o_osd_lru));
 440         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 441         osd->lru_ttl = jiffies + osdc->client->mount_args->osd_idle_ttl * HZ;
 442 }
 443
 444 static void __remove_osd_from_lru(struct ceph_osd *osd)
 445 {
 446         dout("__remove_osd_from_lru %p\n", osd);
 447         if (!list_empty(&osd->o_osd_lru))
 448                 list_del_init(&osd->o_osd_lru);
 449 }
 450
 451 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
 452 {
 453         struct ceph_osd *osd, *nosd;
 454
 455         dout("__remove_old_osds %p\n", osdc);
 456         mutex_lock(&osdc->request_mutex);
 457         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 458                 if (!remove_all && time_before(jiffies, osd->lru_ttl))
 459                         break;
 460                 __remove_osd(osdc, osd);
 461         }
 462         mutex_unlock(&osdc->request_mutex);
 463 }
 464
 465 /*
 466  * reset osd connect
 467  */
 468 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 469 {
 470         int ret = 0;
 471
 472         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 473         if (list_empty(&osd->o_requests)) {
 474                 __remove_osd(osdc, osd);
 475         } else {
 476                 ceph_con_close(&osd->o_con);
 477                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
 478                 osd->o_incarnation++;
 479         }
 480         return ret;
 481 }
 482
 483 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 484 {
 485         struct rb_node **p = &osdc->osds.rb_node;
 486         struct rb_node *parent = NULL;
 487         struct ceph_osd *osd = NULL;
 488
 489         while (*p) {
 490                 parent = *p;
 491                 osd = rb_entry(parent, struct ceph_osd, o_node);
 492                 if (new->o_osd < osd->o_osd)
 493                         p = &(*p)->rb_left;
 494                 else if (new->o_osd > osd->o_osd)
 495                         p = &(*p)->rb_right;
 496                 else
 497                         BUG();
 498         }
 499
 500         rb_link_node(&new->o_node, parent, p);
 501         rb_insert_color(&new->o_node, &osdc->osds);
 502 }
 503
 504 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 505 {
 506         struct ceph_osd *osd;
 507         struct rb_node *n = osdc->osds.rb_node;
 508
 509         while (n) {
 510                 osd = rb_entry(n, struct ceph_osd, o_node);
 511                 if (o < osd->o_osd)
 512                         n = n->rb_left;
 513                 else if (o > osd->o_osd)
 514                         n = n->rb_right;
 515                 else
 516                         return osd;
 517         }
 518         return NULL;
 519 }
 520
 521
 522 /*
 523  * Register request, assign tid.  If this is the first request, set up
 524  * the timeout event.
 525  */
 526 static void register_request(struct ceph_osd_client *osdc,
 527                              struct ceph_osd_request *req)
 528 {
 529         mutex_lock(&osdc->request_mutex);
 530         req->r_tid = ++osdc->last_tid;
 531         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 532
 533         dout("register_request %p tid %lld\n", req, req->r_tid);
 534         __insert_request(osdc, req);
 535         ceph_osdc_get_request(req);
 536         osdc->num_requests++;
 537
 538         req->r_timeout_stamp =
 539                 jiffies + osdc->client->mount_args->osd_timeout*HZ;
 540
 541         if (osdc->num_requests == 1) {
 542                 osdc->timeout_tid = req->r_tid;
 543                 dout("  timeout on tid %llu at %lu\n", req->r_tid,
 544                      req->r_timeout_stamp);
 545                 schedule_delayed_work(&osdc->timeout_work,
 546                       round_jiffies_relative(req->r_timeout_stamp - jiffies));
 547         }
 548         mutex_unlock(&osdc->request_mutex);
 549 }
 550
 551 /*
 552  * called under osdc->request_mutex
 553  */
 554 static void __unregister_request(struct ceph_osd_client *osdc,
 555                                  struct ceph_osd_request *req)
 556 {
 557         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 558         rb_erase(&req->r_node, &osdc->requests);
 559         osdc->num_requests--;
 560
 561         if (req->r_osd) {
 562                 /* make sure the original request isn't in flight. */
 563                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 564
 565                 list_del_init(&req->r_osd_item);
 566                 if (list_empty(&req->r_osd->o_requests))
 567                         __move_osd_to_lru(osdc, req->r_osd);
 568                 req->r_osd = NULL;
 569         }
 570
 571         ceph_osdc_put_request(req);
 572
 573         if (req->r_tid == osdc->timeout_tid) {
 574                 if (osdc->num_requests == 0) {
 575                         dout("no requests, canceling timeout\n");
 576                         osdc->timeout_tid = 0;
 577                         cancel_delayed_work(&osdc->timeout_work);
 578                 } else {
 579                         req = rb_entry(rb_first(&osdc->requests),
 580                                        struct ceph_osd_request, r_node);
 581                         osdc->timeout_tid = req->r_tid;
 582                         dout("rescheduled timeout on tid %llu at %lu\n",
 583                              req->r_tid, req->r_timeout_stamp);
 584                         schedule_delayed_work(&osdc->timeout_work,
 585                               round_jiffies_relative(req->r_timeout_stamp -
 586                                                      jiffies));
 587                 }
 588         }
 589 }
 590
 591 /*
 592  * Cancel a previously queued request message
 593  */
 594 static void __cancel_request(struct ceph_osd_request *req)
 595 {
 596         if (req->r_sent) {
 597                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 598                 req->r_sent = 0;
 599         }
 600 }
 601
 602 /*
 603  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 604  * (as needed), and set the request r_osd appropriately.  If there is
 605  * no up osd, set r_osd to NULL.
 606  *
 607  * Return 0 if unchanged, 1 if changed, or negative on error.
 608  *
 609  * Caller should hold map_sem for read and request_mutex.
 610  */
 611 static int __map_osds(struct ceph_osd_client *osdc,
 612                       struct ceph_osd_request *req)
 613 {
 614         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 615         struct ceph_pg pgid;
 616         int o = -1;
 617         int err;
 618
 619         dout("map_osds %p tid %lld\n", req, req->r_tid);
 620         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 621                                       &req->r_file_layout, osdc->osdmap);
 622         if (err)
 623                 return err;
 624         pgid = reqhead->layout.ol_pgid;
 625         req->r_pgid = pgid;
 626
 627         o = ceph_calc_pg_primary(osdc->osdmap, pgid);
 628
 629         if ((req->r_osd && req->r_osd->o_osd == o &&
 630              req->r_sent >= req->r_osd->o_incarnation) ||
 631             (req->r_osd == NULL && o == -1))
 632                 return 0;  /* no change */
 633
 634         dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
 635              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 636              req->r_osd ? req->r_osd->o_osd : -1);
 637
 638         if (req->r_osd) {
 639                 __cancel_request(req);
 640                 list_del_init(&req->r_osd_item);
 641                 req->r_osd = NULL;
 642         }
 643
 644         req->r_osd = __lookup_osd(osdc, o);
 645         if (!req->r_osd && o >= 0) {
 646                 err = -ENOMEM;
 647                 req->r_osd = create_osd(osdc);
 648                 if (!req->r_osd)
 649                         goto out;
 650
 651                 dout("map_osds osd %p is osd%d\n", req->r_osd, o);
 652                 req->r_osd->o_osd = o;
 653                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
 654                 __insert_osd(osdc, req->r_osd);
 655
 656                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
 657         }
 658
 659         if (req->r_osd) {
 660                 __remove_osd_from_lru(req->r_osd);
 661                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 662         }
 663         err = 1;   /* osd changed */
 664
 665 out:
 666         return err;
 667 }
 668
 669 /*
 670  * caller should hold map_sem (for read) and request_mutex
 671  */
 672 static int __send_request(struct ceph_osd_client *osdc,
 673                           struct ceph_osd_request *req)
 674 {
 675         struct ceph_osd_request_head *reqhead;
 676         int err;
 677
 678         err = __map_osds(osdc, req);
 679         if (err < 0)
 680                 return err;
 681         if (req->r_osd == NULL) {
 682                 dout("send_request %p no up osds in pg\n", req);
 683                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 684                 return 0;
 685         }
 686
 687         dout("send_request %p tid %llu to osd%d flags %d\n",
 688              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
 689
 690         reqhead = req->r_request->front.iov_base;
 691         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
 692         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
 693         reqhead->reassert_version = req->r_reassert_version;
 694
 695         req->r_timeout_stamp = jiffies+osdc->client->mount_args->osd_timeout*HZ;
 696
 697         ceph_msg_get(req->r_request); /* send consumes a ref */
 698         ceph_con_send(&req->r_osd->o_con, req->r_request);
 699         req->r_sent = req->r_osd->o_incarnation;
 700         return 0;
 701 }
 702
 703 /*
 704  * Timeout callback, called every N seconds when 1 or more osd
 705  * requests has been active for more than N seconds.  When this
 706  * happens, we ping all OSDs with requests who have timed out to
 707  * ensure any communications channel reset is detected.  Reset the
 708  * request timeouts another N seconds in the future as we go.
 709  * Reschedule the timeout event another N seconds in future (unless
 710  * there are no open requests).
 711  */
 712 static void handle_timeout(struct work_struct *work)
 713 {
 714         struct ceph_osd_client *osdc =
 715                 container_of(work, struct ceph_osd_client, timeout_work.work);
 716         struct ceph_osd_request *req;
 717         struct ceph_osd *osd;
 718         unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
 719         unsigned long next_timeout = timeout + jiffies;
 720         struct rb_node *p;
 721
 722         dout("timeout\n");
 723         down_read(&osdc->map_sem);
 724
 725         ceph_monc_request_next_osdmap(&osdc->client->monc);
 726
 727         mutex_lock(&osdc->request_mutex);
 728         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 729                 req = rb_entry(p, struct ceph_osd_request, r_node);
 730
 731                 if (req->r_resend) {
 732                         int err;
 733
 734                         dout("osdc resending prev failed %lld\n", req->r_tid);
 735                         err = __send_request(osdc, req);
 736                         if (err)
 737                                 dout("osdc failed again on %lld\n", req->r_tid);
 738                         else
 739                                 req->r_resend = false;
 740                         continue;
 741                 }
 742         }
 743         for (p = rb_first(&osdc->osds); p; p = rb_next(p)) {
 744                 osd = rb_entry(p, struct ceph_osd, o_node);
 745                 if (list_empty(&osd->o_requests))
 746                         continue;
 747                 req = list_first_entry(&osd->o_requests,
 748                                        struct ceph_osd_request, r_osd_item);
 749                 if (time_before(jiffies, req->r_timeout_stamp))
 750                         continue;
 751
 752                 dout(" tid %llu (at least) timed out on osd%d\n",
 753                      req->r_tid, osd->o_osd);
 754                 req->r_timeout_stamp = next_timeout;
 755                 ceph_con_keepalive(&osd->o_con);
 756         }
 757
 758         if (osdc->timeout_tid)
 759                 schedule_delayed_work(&osdc->timeout_work,
 760                                       round_jiffies_relative(timeout));
 761
 762         mutex_unlock(&osdc->request_mutex);
 763
 764         up_read(&osdc->map_sem);
 765 }
 766
 767 static void handle_osds_timeout(struct work_struct *work)
 768 {
 769         struct ceph_osd_client *osdc =
 770                 container_of(work, struct ceph_osd_client,
 771                              osds_timeout_work.work);
 772         unsigned long delay =
 773                 osdc->client->mount_args->osd_idle_ttl * HZ >> 2;
 774
 775         dout("osds timeout\n");
 776         down_read(&osdc->map_sem);
 777         remove_old_osds(osdc, 0);
 778         up_read(&osdc->map_sem);
 779
 780         schedule_delayed_work(&osdc->osds_timeout_work,
 781                               round_jiffies_relative(delay));
 782 }
 783
 784 /*
 785  * handle osd op reply.  either call the callback if it is specified,
 786  * or do the completion to wake up the waiting thread.
 787  */
 788 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
 789                          struct ceph_connection *con)
 790 {
 791         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
 792         struct ceph_osd_request *req;
 793         u64 tid;
 794         int numops, object_len, flags;
 795
 796         tid = le64_to_cpu(msg->hdr.tid);
 797         if (msg->front.iov_len < sizeof(*rhead))
 798                 goto bad;
 799         numops = le32_to_cpu(rhead->num_ops);
 800         object_len = le32_to_cpu(rhead->object_len);
 801         if (msg->front.iov_len != sizeof(*rhead) + object_len +
 802             numops * sizeof(struct ceph_osd_op))
 803                 goto bad;
 804         dout("handle_reply %p tid %llu\n", msg, tid);
 805
 806         /* lookup */
 807         mutex_lock(&osdc->request_mutex);
 808         req = __lookup_request(osdc, tid);
 809         if (req == NULL) {
 810                 dout("handle_reply tid %llu dne\n", tid);
 811                 mutex_unlock(&osdc->request_mutex);
 812                 return;
 813         }
 814         ceph_osdc_get_request(req);
 815         flags = le32_to_cpu(rhead->flags);
 816
 817         /*
 818          * if this connection filled our message, drop our reference now, to
 819          * avoid a (safe but slower) revoke later.
 820          */
 821         if (req->r_con_filling_msg == con && req->r_reply == msg) {
 822                 dout(" got pages, dropping con_filling_msg ref %p\n", con);
 823                 req->r_con_filling_msg = NULL;
 824                 ceph_con_put(con);
 825         }
 826
 827         if (req->r_reply) {
 828                 /*
 829                  * once we see the message has been received, we don't
 830                  * need a ref (which is only needed for revoking
 831                  * pages)
 832                  */
 833                 ceph_msg_put(req->r_reply);
 834                 req->r_reply = NULL;
 835         }
 836
 837         if (!req->r_got_reply) {
 838                 unsigned bytes;
 839
 840                 req->r_result = le32_to_cpu(rhead->result);
 841                 bytes = le32_to_cpu(msg->hdr.data_len);
 842                 dout("handle_reply result %d bytes %d\n", req->r_result,
 843                      bytes);
 844                 if (req->r_result == 0)
 845                         req->r_result = bytes;
 846
 847                 /* in case this is a write and we need to replay, */
 848                 req->r_reassert_version = rhead->reassert_version;
 849
 850                 req->r_got_reply = 1;
 851         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
 852                 dout("handle_reply tid %llu dup ack\n", tid);
 853                 mutex_unlock(&osdc->request_mutex);
 854                 goto done;
 855         }
 856
 857         dout("handle_reply tid %llu flags %d\n", tid, flags);
 858
 859         /* either this is a read, or we got the safe response */
 860         if ((flags & CEPH_OSD_FLAG_ONDISK) ||
 861             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
 862                 __unregister_request(osdc, req);
 863
 864         mutex_unlock(&osdc->request_mutex);
 865
 866         if (req->r_callback)
 867                 req->r_callback(req, msg);
 868         else
 869                 complete(&req->r_completion);
 870
 871         if (flags & CEPH_OSD_FLAG_ONDISK) {
 872                 if (req->r_safe_callback)
 873                         req->r_safe_callback(req, msg);
 874                 complete(&req->r_safe_completion);  /* fsync waiter */
 875         }
 876
 877 done:
 878         ceph_osdc_put_request(req);
 879         return;
 880
 881 bad:
 882         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
 883                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
 884                (int)sizeof(*rhead));
 885         ceph_msg_dump(msg);
 886 }
 887
 888
 889 /*
 890  * Resubmit osd requests whose osd or osd address has changed.  Request
 891  * a new osd map if osds are down, or we are otherwise unable to determine
 892  * how to direct a request.
 893  *
 894  * Close connections to down osds.
 895  *
 896  * If @who is specified, resubmit requests for that specific osd.
 897  *
 898  * Caller should hold map_sem for read and request_mutex.
 899  */
 900 static void kick_requests(struct ceph_osd_client *osdc,
 901                           struct ceph_osd *kickosd)
 902 {
 903         struct ceph_osd_request *req;
 904         struct rb_node *p, *n;
 905         int needmap = 0;
 906         int err;
 907
 908         dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
 909         mutex_lock(&osdc->request_mutex);
 910         if (kickosd) {
 911                 __reset_osd(osdc, kickosd);
 912         } else {
 913                 for (p = rb_first(&osdc->osds); p; p = n) {
 914                         struct ceph_osd *osd =
 915                                 rb_entry(p, struct ceph_osd, o_node);
 916
 917                         n = rb_next(p);
 918                         if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
 919                             memcmp(&osd->o_con.peer_addr,
 920                                    ceph_osd_addr(osdc->osdmap,
 921                                                  osd->o_osd),
 922                                    sizeof(struct ceph_entity_addr)) != 0)
 923                                 __reset_osd(osdc, osd);
 924                 }
 925         }
 926
 927         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 928                 req = rb_entry(p, struct ceph_osd_request, r_node);
 929
 930                 if (req->r_resend) {
 931                         dout(" r_resend set on tid %llu\n", req->r_tid);
 932                         __cancel_request(req);
 933                         goto kick;
 934                 }
 935                 if (req->r_osd && kickosd == req->r_osd) {
 936                         __cancel_request(req);
 937                         goto kick;
 938                 }
 939
 940                 err = __map_osds(osdc, req);
 941                 if (err == 0)
 942                         continue;  /* no change */
 943                 if (err < 0) {
 944                         /*
 945                          * FIXME: really, we should set the request
 946                          * error and fail if this isn't a 'nofail'
 947                          * request, but that's a fair bit more
 948                          * complicated to do.  So retry!
 949                          */
 950                         dout(" setting r_resend on %llu\n", req->r_tid);
 951                         req->r_resend = true;
 952                         continue;
 953                 }
 954                 if (req->r_osd == NULL) {
 955                         dout("tid %llu maps to no valid osd\n", req->r_tid);
 956                         needmap++;  /* request a newer map */
 957                         continue;
 958                 }
 959
 960 kick:
 961                 dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
 962                      req->r_osd->o_osd);
 963                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
 964                 err = __send_request(osdc, req);
 965                 if (err) {
 966                         dout(" setting r_resend on %llu\n", req->r_tid);
 967                         req->r_resend = true;
 968                 }
 969         }
 970         mutex_unlock(&osdc->request_mutex);
 971
 972         if (needmap) {
 973                 dout("%d requests for down osds, need new map\n", needmap);
 974                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 975         }
 976 }
 977
 978 /*
 979  * Process updated osd map.
 980  *
 981  * The message contains any number of incremental and full maps, normally
 982  * indicating some sort of topology change in the cluster.  Kick requests
 983  * off to different OSDs as needed.
 984  */
 985 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 986 {
 987         void *p, *end, *next;
 988         u32 nr_maps, maplen;
 989         u32 epoch;
 990         struct ceph_osdmap *newmap = NULL, *oldmap;
 991         int err;
 992         struct ceph_fsid fsid;
 993
 994         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
 995         p = msg->front.iov_base;
 996         end = p + msg->front.iov_len;
 997
 998         /* verify fsid */
 999         ceph_decode_need(&p, end, sizeof(fsid), bad);
1000         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1001         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1002                 return;
1003
1004         down_write(&osdc->map_sem);
1005
1006         /* incremental maps */
1007         ceph_decode_32_safe(&p, end, nr_maps, bad);
1008         dout(" %d inc maps\n", nr_maps);
1009         while (nr_maps > 0) {
1010                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1011                 epoch = ceph_decode_32(&p);
1012                 maplen = ceph_decode_32(&p);
1013                 ceph_decode_need(&p, end, maplen, bad);
1014                 next = p + maplen;
1015                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1016                         dout("applying incremental map %u len %d\n",
1017                              epoch, maplen);
1018                         newmap = osdmap_apply_incremental(&p, next,
1019                                                           osdc->osdmap,
1020                                                           osdc->client->msgr);
1021                         if (IS_ERR(newmap)) {
1022                                 err = PTR_ERR(newmap);
1023                                 goto bad;
1024                         }
1025                         BUG_ON(!newmap);
1026                         if (newmap != osdc->osdmap) {
1027                                 ceph_osdmap_destroy(osdc->osdmap);
1028                                 osdc->osdmap = newmap;
1029                         }
1030                 } else {
1031                         dout("ignoring incremental map %u len %d\n",
1032                              epoch, maplen);
1033                 }
1034                 p = next;
1035                 nr_maps--;
1036         }
1037         if (newmap)
1038                 goto done;
1039
1040         /* full maps */
1041         ceph_decode_32_safe(&p, end, nr_maps, bad);
1042         dout(" %d full maps\n", nr_maps);
1043         while (nr_maps) {
1044                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1045                 epoch = ceph_decode_32(&p);
1046                 maplen = ceph_decode_32(&p);
1047                 ceph_decode_need(&p, end, maplen, bad);
1048                 if (nr_maps > 1) {
1049                         dout("skipping non-latest full map %u len %d\n",
1050                              epoch, maplen);
1051                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1052                         dout("skipping full map %u len %d, "
1053                              "older than our %u\n", epoch, maplen,
1054                              osdc->osdmap->epoch);
1055                 } else {
1056                         dout("taking full map %u len %d\n", epoch, maplen);
1057                         newmap = osdmap_decode(&p, p+maplen);
1058                         if (IS_ERR(newmap)) {
1059                                 err = PTR_ERR(newmap);
1060                                 goto bad;
1061                         }
1062                         BUG_ON(!newmap);
1063                         oldmap = osdc->osdmap;
1064                         osdc->osdmap = newmap;
1065                         if (oldmap)
1066                                 ceph_osdmap_destroy(oldmap);
1067                 }
1068                 p += maplen;
1069                 nr_maps--;
1070         }
1071
1072 done:
1073         downgrade_write(&osdc->map_sem);
1074         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1075         if (newmap)
1076                 kick_requests(osdc, NULL);
1077         up_read(&osdc->map_sem);
1078         return;
1079
1080 bad:
1081         pr_err("osdc handle_map corrupt msg\n");
1082         ceph_msg_dump(msg);
1083         up_write(&osdc->map_sem);
1084         return;
1085 }
1086
1087
1088 /*
1089  * A read request prepares specific pages that data is to be read into.
1090  * When a message is being read off the wire, we call prepare_pages to
1091  * find those pages.
1092  *  0 = success, -1 failure.
1093  */
1094 static int __prepare_pages(struct ceph_connection *con,
1095                          struct ceph_msg_header *hdr,
1096                          struct ceph_osd_request *req,
1097                          u64 tid,
1098                          struct ceph_msg *m)
1099 {
1100         struct ceph_osd *osd = con->private;
1101         struct ceph_osd_client *osdc;
1102         int ret = -1;
1103         int data_len = le32_to_cpu(hdr->data_len);
1104         unsigned data_off = le16_to_cpu(hdr->data_off);
1105
1106         int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
1107
1108         if (!osd)
1109                 return -1;
1110
1111         osdc = osd->o_osdc;
1112
1113         dout("__prepare_pages on msg %p tid %llu, has %d pages, want %d\n", m,
1114              tid, req->r_num_pages, want);
1115         if (unlikely(req->r_num_pages < want))
1116                 goto out;
1117         m->pages = req->r_pages;
1118         m->nr_pages = req->r_num_pages;
1119         ret = 0; /* success */
1120 out:
1121         BUG_ON(ret < 0 || m->nr_pages < want);
1122
1123         return ret;
1124 }
1125
1126 /*
1127  * Register request, send initial attempt.
1128  */
1129 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1130                             struct ceph_osd_request *req,
1131                             bool nofail)
1132 {
1133         int rc = 0;
1134
1135         req->r_request->pages = req->r_pages;
1136         req->r_request->nr_pages = req->r_num_pages;
1137
1138         register_request(osdc, req);
1139
1140         down_read(&osdc->map_sem);
1141         mutex_lock(&osdc->request_mutex);
1142         /*
1143          * a racing kick_requests() may have sent the message for us
1144          * while we dropped request_mutex above, so only send now if
1145          * the request still han't been touched yet.
1146          */
1147         if (req->r_sent == 0) {
1148                 rc = __send_request(osdc, req);
1149                 if (rc) {
1150                         if (nofail) {
1151                                 dout("osdc_start_request failed send, "
1152                                      " marking %lld\n", req->r_tid);
1153                                 req->r_resend = true;
1154                                 rc = 0;
1155                         } else {
1156                                 __unregister_request(osdc, req);
1157                         }
1158                 }
1159         }
1160         mutex_unlock(&osdc->request_mutex);
1161         up_read(&osdc->map_sem);
1162         return rc;
1163 }
1164
1165 /*
1166  * wait for a request to complete
1167  */
1168 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1169                            struct ceph_osd_request *req)
1170 {
1171         int rc;
1172
1173         rc = wait_for_completion_interruptible(&req->r_completion);
1174         if (rc < 0) {
1175                 mutex_lock(&osdc->request_mutex);
1176                 __cancel_request(req);
1177                 __unregister_request(osdc, req);
1178                 mutex_unlock(&osdc->request_mutex);
1179                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1180                 return rc;
1181         }
1182
1183         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1184         return req->r_result;
1185 }
1186
1187 /*
1188  * sync - wait for all in-flight requests to flush.  avoid starvation.
1189  */
1190 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1191 {
1192         struct ceph_osd_request *req;
1193         u64 last_tid, next_tid = 0;
1194
1195         mutex_lock(&osdc->request_mutex);
1196         last_tid = osdc->last_tid;
1197         while (1) {
1198                 req = __lookup_request_ge(osdc, next_tid);
1199                 if (!req)
1200                         break;
1201                 if (req->r_tid > last_tid)
1202                         break;
1203
1204                 next_tid = req->r_tid + 1;
1205                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1206                         continue;
1207
1208                 ceph_osdc_get_request(req);
1209                 mutex_unlock(&osdc->request_mutex);
1210                 dout("sync waiting on tid %llu (last is %llu)\n",
1211                      req->r_tid, last_tid);
1212                 wait_for_completion(&req->r_safe_completion);
1213                 mutex_lock(&osdc->request_mutex);
1214                 ceph_osdc_put_request(req);
1215         }
1216         mutex_unlock(&osdc->request_mutex);
1217         dout("sync done (thru tid %llu)\n", last_tid);
1218 }
1219
1220 /*
1221  * init, shutdown
1222  */
1223 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1224 {
1225         int err;
1226
1227         dout("init\n");
1228         osdc->client = client;
1229         osdc->osdmap = NULL;
1230         init_rwsem(&osdc->map_sem);
1231         init_completion(&osdc->map_waiters);
1232         osdc->last_requested_map = 0;
1233         mutex_init(&osdc->request_mutex);
1234         osdc->timeout_tid = 0;
1235         osdc->last_tid = 0;
1236         osdc->osds = RB_ROOT;
1237         INIT_LIST_HEAD(&osdc->osd_lru);
1238         osdc->requests = RB_ROOT;
1239         osdc->num_requests = 0;
1240         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1241         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1242
1243         schedule_delayed_work(&osdc->osds_timeout_work,
1244            round_jiffies_relative(osdc->client->mount_args->osd_idle_ttl * HZ));
1245
1246         err = -ENOMEM;
1247         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1248                                         sizeof(struct ceph_osd_request));
1249         if (!osdc->req_mempool)
1250                 goto out;
1251
1252         err = ceph_msgpool_init(&osdc->msgpool_op, 4096, 10, true);
1253         if (err < 0)
1254                 goto out_mempool;
1255         return 0;
1256
1257 out_mempool:
1258         mempool_destroy(osdc->req_mempool);
1259 out:
1260         return err;
1261 }
1262
1263 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1264 {
1265         cancel_delayed_work_sync(&osdc->timeout_work);
1266         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1267         if (osdc->osdmap) {
1268                 ceph_osdmap_destroy(osdc->osdmap);
1269                 osdc->osdmap = NULL;
1270         }
1271         remove_old_osds(osdc, 1);
1272         mempool_destroy(osdc->req_mempool);
1273         ceph_msgpool_destroy(&osdc->msgpool_op);
1274 }
1275
1276 /*
1277  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1278  * *plen.  Return number of bytes read, or error.
1279  */
1280 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1281                         struct ceph_vino vino, struct ceph_file_layout *layout,
1282                         u64 off, u64 *plen,
1283                         u32 truncate_seq, u64 truncate_size,
1284                         struct page **pages, int num_pages)
1285 {
1286         struct ceph_osd_request *req;
1287         int rc = 0;
1288
1289         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1290              vino.snap, off, *plen);
1291         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1292                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1293                                     NULL, 0, truncate_seq, truncate_size, NULL,
1294                                     false, 1);
1295         if (IS_ERR(req))
1296                 return PTR_ERR(req);
1297
1298         /* it may be a short read due to an object boundary */
1299         req->r_pages = pages;
1300         num_pages = calc_pages_for(off, *plen);
1301         req->r_num_pages = num_pages;
1302
1303         dout("readpages  final extent is %llu~%llu (%d pages)\n",
1304              off, *plen, req->r_num_pages);
1305
1306         rc = ceph_osdc_start_request(osdc, req, false);
1307         if (!rc)
1308                 rc = ceph_osdc_wait_request(osdc, req);
1309
1310         ceph_osdc_put_request(req);
1311         dout("readpages result %d\n", rc);
1312         return rc;
1313 }
1314
1315 /*
1316  * do a synchronous write on N pages
1317  */
1318 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1319                          struct ceph_file_layout *layout,
1320                          struct ceph_snap_context *snapc,
1321                          u64 off, u64 len,
1322                          u32 truncate_seq, u64 truncate_size,
1323                          struct timespec *mtime,
1324                          struct page **pages, int num_pages,
1325                          int flags, int do_sync, bool nofail)
1326 {
1327         struct ceph_osd_request *req;
1328         int rc = 0;
1329
1330         BUG_ON(vino.snap != CEPH_NOSNAP);
1331         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1332                                     CEPH_OSD_OP_WRITE,
1333                                     flags | CEPH_OSD_FLAG_ONDISK |
1334                                             CEPH_OSD_FLAG_WRITE,
1335                                     snapc, do_sync,
1336                                     truncate_seq, truncate_size, mtime,
1337                                     nofail, 1);
1338         if (IS_ERR(req))
1339                 return PTR_ERR(req);
1340
1341         /* it may be a short write due to an object boundary */
1342         req->r_pages = pages;
1343         req->r_num_pages = calc_pages_for(off, len);
1344         dout("writepages %llu~%llu (%d pages)\n", off, len,
1345              req->r_num_pages);
1346
1347         rc = ceph_osdc_start_request(osdc, req, nofail);
1348         if (!rc)
1349                 rc = ceph_osdc_wait_request(osdc, req);
1350
1351         ceph_osdc_put_request(req);
1352         if (rc == 0)
1353                 rc = len;
1354         dout("writepages result %d\n", rc);
1355         return rc;
1356 }
1357
1358 /*
1359  * handle incoming message
1360  */
1361 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1362 {
1363         struct ceph_osd *osd = con->private;
1364         struct ceph_osd_client *osdc;
1365         int type = le16_to_cpu(msg->hdr.type);
1366
1367         if (!osd)
1368                 return;
1369         osdc = osd->o_osdc;
1370
1371         switch (type) {
1372         case CEPH_MSG_OSD_MAP:
1373                 ceph_osdc_handle_map(osdc, msg);
1374                 break;
1375         case CEPH_MSG_OSD_OPREPLY:
1376                 handle_reply(osdc, msg, con);
1377                 break;
1378
1379         default:
1380                 pr_err("received unknown message type %d %s\n", type,
1381                        ceph_msg_type_name(type));
1382         }
1383         ceph_msg_put(msg);
1384 }
1385
1386 /*
1387  * lookup and return message for incoming reply
1388  */
1389 static struct ceph_msg *get_reply(struct ceph_connection *con,
1390                                   struct ceph_msg_header *hdr,
1391                                   int *skip)
1392 {
1393         struct ceph_osd *osd = con->private;
1394         struct ceph_osd_client *osdc = osd->o_osdc;
1395         struct ceph_msg *m;
1396         struct ceph_osd_request *req;
1397         int front = le32_to_cpu(hdr->front_len);
1398         int data_len = le32_to_cpu(hdr->data_len);
1399         u64 tid;
1400         int err;
1401
1402         tid = le64_to_cpu(hdr->tid);
1403         mutex_lock(&osdc->request_mutex);
1404         req = __lookup_request(osdc, tid);
1405         if (!req) {
1406                 *skip = 1;
1407                 m = NULL;
1408                 pr_info("alloc_msg unknown tid %llu from osd%d\n", tid,
1409                         osd->o_osd);
1410                 goto out;
1411         }
1412         m = __get_next_reply(con, req, front);
1413         if (!m || IS_ERR(m)) {
1414                 *skip = 1;
1415                 goto out;
1416         }
1417
1418         if (data_len > 0) {
1419                 err = __prepare_pages(con, hdr, req, tid, m);
1420                 if (err < 0) {
1421                         *skip = 1;
1422                         ceph_msg_put(m);
1423                         m = ERR_PTR(err);
1424                 }
1425         }
1426         *skip = 0;
1427
1428 out:
1429         mutex_unlock(&osdc->request_mutex);
1430         return m;
1431
1432 }
1433
1434 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
1435                                   struct ceph_msg_header *hdr,
1436                                   int *skip)
1437 {
1438         struct ceph_osd *osd = con->private;
1439         int type = le16_to_cpu(hdr->type);
1440         int front = le32_to_cpu(hdr->front_len);
1441
1442         switch (type) {
1443         case CEPH_MSG_OSD_MAP:
1444                 return ceph_msg_new(type, front, 0, 0, NULL);
1445         case CEPH_MSG_OSD_OPREPLY:
1446                 return get_reply(con, hdr, skip);
1447         default:
1448                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
1449                         osd->o_osd);
1450                 *skip = 1;
1451                 return NULL;
1452         }
1453 }
1454
1455 /*
1456  * Wrappers to refcount containing ceph_osd struct
1457  */
1458 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
1459 {
1460         struct ceph_osd *osd = con->private;
1461         if (get_osd(osd))
1462                 return con;
1463         return NULL;
1464 }
1465
1466 static void put_osd_con(struct ceph_connection *con)
1467 {
1468         struct ceph_osd *osd = con->private;
1469         put_osd(osd);
1470 }
1471
1472 /*
1473  * authentication
1474  */
1475 static int get_authorizer(struct ceph_connection *con,
1476                           void **buf, int *len, int *proto,
1477                           void **reply_buf, int *reply_len, int force_new)
1478 {
1479         struct ceph_osd *o = con->private;
1480         struct ceph_osd_client *osdc = o->o_osdc;
1481         struct ceph_auth_client *ac = osdc->client->monc.auth;
1482         int ret = 0;
1483
1484         if (force_new && o->o_authorizer) {
1485                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
1486                 o->o_authorizer = NULL;
1487         }
1488         if (o->o_authorizer == NULL) {
1489                 ret = ac->ops->create_authorizer(
1490                         ac, CEPH_ENTITY_TYPE_OSD,
1491                         &o->o_authorizer,
1492                         &o->o_authorizer_buf,
1493                         &o->o_authorizer_buf_len,
1494                         &o->o_authorizer_reply_buf,
1495                         &o->o_authorizer_reply_buf_len);
1496                 if (ret)
1497                 return ret;
1498         }
1499
1500         *proto = ac->protocol;
1501         *buf = o->o_authorizer_buf;
1502         *len = o->o_authorizer_buf_len;
1503         *reply_buf = o->o_authorizer_reply_buf;
1504         *reply_len = o->o_authorizer_reply_buf_len;
1505         return 0;
1506 }
1507
1508
1509 static int verify_authorizer_reply(struct ceph_connection *con, int len)
1510 {
1511         struct ceph_osd *o = con->private;
1512         struct ceph_osd_client *osdc = o->o_osdc;
1513         struct ceph_auth_client *ac = osdc->client->monc.auth;
1514
1515         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
1516 }
1517
1518 static int invalidate_authorizer(struct ceph_connection *con)
1519 {
1520         struct ceph_osd *o = con->private;
1521         struct ceph_osd_client *osdc = o->o_osdc;
1522         struct ceph_auth_client *ac = osdc->client->monc.auth;
1523
1524         if (ac->ops->invalidate_authorizer)
1525                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
1526
1527         return ceph_monc_validate_auth(&osdc->client->monc);
1528 }
1529
1530 const static struct ceph_connection_operations osd_con_ops = {
1531         .get = get_osd_con,
1532         .put = put_osd_con,
1533         .dispatch = dispatch,
1534         .get_authorizer = get_authorizer,
1535         .verify_authorizer_reply = verify_authorizer_reply,
1536         .invalidate_authorizer = invalidate_authorizer,
1537         .alloc_msg = alloc_msg,
1538         .fault = osd_reset,
1539 };