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_OP_FRONT_LEN        4096
  17 #define OSD_OPREPLY_FRONT_LEN   512
  18
  19 const static struct ceph_connection_operations osd_con_ops;
  20 static int __kick_requests(struct ceph_osd_client *osdc,
  21                           struct ceph_osd *kickosd);
  22
  23 static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  24
  25 /*
  26  * Implement client access to distributed object storage cluster.
  27  *
  28  * All data objects are stored within a cluster/cloud of OSDs, or
  29  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  30  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  31  * remote daemons serving up and coordinating consistent and safe
  32  * access to storage.
  33  *
  34  * Cluster membership and the mapping of data objects onto storage devices
  35  * are described by the osd map.
  36  *
  37  * We keep track of pending OSD requests (read, write), resubmit
  38  * requests to different OSDs when the cluster topology/data layout
  39  * change, or retry the affected requests when the communications
  40  * channel with an OSD is reset.
  41  */
  42
  43 /*
  44  * calculate the mapping of a file extent onto an object, and fill out the
  45  * request accordingly.  shorten extent as necessary if it crosses an
  46  * object boundary.
  47  *
  48  * fill osd op in request message.
  49  */
  50 static void calc_layout(struct ceph_osd_client *osdc,
  51                         struct ceph_vino vino, struct ceph_file_layout *layout,
  52                         u64 off, u64 *plen,
  53                         struct ceph_osd_request *req)
  54 {
  55         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
  56         struct ceph_osd_op *op = (void *)(reqhead + 1);
  57         u64 orig_len = *plen;
  58         u64 objoff, objlen;    /* extent in object */
  59         u64 bno;
  60
  61         reqhead->snapid = cpu_to_le64(vino.snap);
  62
  63         /* object extent? */
  64         ceph_calc_file_object_mapping(layout, off, plen, &bno,
  65                                       &objoff, &objlen);
  66         if (*plen < orig_len)
  67                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  68                      orig_len - *plen, off, *plen);
  69
  70         sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
  71         req->r_oid_len = strlen(req->r_oid);
  72
  73         op->extent.offset = cpu_to_le64(objoff);
  74         op->extent.length = cpu_to_le64(objlen);
  75         req->r_num_pages = calc_pages_for(off, *plen);
  76
  77         dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
  78              req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
  79 }
  80
  81 /*
  82  * requests
  83  */
  84 void ceph_osdc_release_request(struct kref *kref)
  85 {
  86         struct ceph_osd_request *req = container_of(kref,
  87                                                     struct ceph_osd_request,
  88                                                     r_kref);
  89
  90         if (req->r_request)
  91                 ceph_msg_put(req->r_request);
  92         if (req->r_reply)
  93                 ceph_msg_put(req->r_reply);
  94         if (req->r_con_filling_msg) {
  95                 dout("release_request revoking pages %p from con %p\n",
  96                      req->r_pages, req->r_con_filling_msg);
  97                 ceph_con_revoke_message(req->r_con_filling_msg,
  98                                       req->r_reply);
  99                 ceph_con_put(req->r_con_filling_msg);
 100         }
 101         if (req->r_own_pages)
 102                 ceph_release_page_vector(req->r_pages,
 103                                          req->r_num_pages);
 104         ceph_put_snap_context(req->r_snapc);
 105         if (req->r_mempool)
 106                 mempool_free(req, req->r_osdc->req_mempool);
 107         else
 108                 kfree(req);
 109 }
 110
 111 /*
 112  * build new request AND message, calculate layout, and adjust file
 113  * extent as needed.
 114  *
 115  * if the file was recently truncated, we include information about its
 116  * old and new size so that the object can be updated appropriately.  (we
 117  * avoid synchronously deleting truncated objects because it's slow.)
 118  *
 119  * if @do_sync, include a 'startsync' command so that the osd will flush
 120  * data quickly.
 121  */
 122 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 123                                                struct ceph_file_layout *layout,
 124                                                struct ceph_vino vino,
 125                                                u64 off, u64 *plen,
 126                                                int opcode, int flags,
 127                                                struct ceph_snap_context *snapc,
 128                                                int do_sync,
 129                                                u32 truncate_seq,
 130                                                u64 truncate_size,
 131                                                struct timespec *mtime,
 132                                                bool use_mempool, int num_reply)
 133 {
 134         struct ceph_osd_request *req;
 135         struct ceph_msg *msg;
 136         struct ceph_osd_request_head *head;
 137         struct ceph_osd_op *op;
 138         void *p;
 139         int num_op = 1 + do_sync;
 140         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 141         int i;
 142
 143         if (use_mempool) {
 144                 req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
 145                 memset(req, 0, sizeof(*req));
 146         } else {
 147                 req = kzalloc(sizeof(*req), GFP_NOFS);
 148         }
 149         if (req == NULL)
 150                 return ERR_PTR(-ENOMEM);
 151
 152         req->r_osdc = osdc;
 153         req->r_mempool = use_mempool;
 154         kref_init(&req->r_kref);
 155         init_completion(&req->r_completion);
 156         init_completion(&req->r_safe_completion);
 157         INIT_LIST_HEAD(&req->r_unsafe_item);
 158         req->r_flags = flags;
 159
 160         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
 161
 162         /* create reply message */
 163         if (use_mempool)
 164                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 165         else
 166                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 167                                    OSD_OPREPLY_FRONT_LEN, 0, 0, NULL);
 168         if (IS_ERR(msg)) {
 169                 ceph_osdc_put_request(req);
 170                 return ERR_PTR(PTR_ERR(msg));
 171         }
 172         req->r_reply = msg;
 173
 174         /* create request message; allow space for oid */
 175         msg_size += 40;
 176         if (snapc)
 177                 msg_size += sizeof(u64) * snapc->num_snaps;
 178         if (use_mempool)
 179                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 180         else
 181                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, 0, 0, NULL);
 182         if (IS_ERR(msg)) {
 183                 ceph_osdc_put_request(req);
 184                 return ERR_PTR(PTR_ERR(msg));
 185         }
 186         msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
 187         memset(msg->front.iov_base, 0, msg->front.iov_len);
 188         head = msg->front.iov_base;
 189         op = (void *)(head + 1);
 190         p = (void *)(op + num_op);
 191
 192         req->r_request = msg;
 193         req->r_snapc = ceph_get_snap_context(snapc);
 194
 195         head->client_inc = cpu_to_le32(1); /* always, for now. */
 196         head->flags = cpu_to_le32(flags);
 197         if (flags & CEPH_OSD_FLAG_WRITE)
 198                 ceph_encode_timespec(&head->mtime, mtime);
 199         head->num_ops = cpu_to_le16(num_op);
 200         op->op = cpu_to_le16(opcode);
 201
 202         /* calculate max write size */
 203         calc_layout(osdc, vino, layout, off, plen, req);
 204         req->r_file_layout = *layout;  /* keep a copy */
 205
 206         if (flags & CEPH_OSD_FLAG_WRITE) {
 207                 req->r_request->hdr.data_off = cpu_to_le16(off);
 208                 req->r_request->hdr.data_len = cpu_to_le32(*plen);
 209                 op->payload_len = cpu_to_le32(*plen);
 210         }
 211         op->extent.truncate_size = cpu_to_le64(truncate_size);
 212         op->extent.truncate_seq = cpu_to_le32(truncate_seq);
 213
 214         /* fill in oid */
 215         head->object_len = cpu_to_le32(req->r_oid_len);
 216         memcpy(p, req->r_oid, req->r_oid_len);
 217         p += req->r_oid_len;
 218
 219         if (do_sync) {
 220                 op++;
 221                 op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC);
 222         }
 223         if (snapc) {
 224                 head->snap_seq = cpu_to_le64(snapc->seq);
 225                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
 226                 for (i = 0; i < snapc->num_snaps; i++) {
 227                         put_unaligned_le64(snapc->snaps[i], p);
 228                         p += sizeof(u64);
 229                 }
 230         }
 231
 232         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
 233         msg_size = p - msg->front.iov_base;
 234         msg->front.iov_len = msg_size;
 235         msg->hdr.front_len = cpu_to_le32(msg_size);
 236         return req;
 237 }
 238
 239 /*
 240  * We keep osd requests in an rbtree, sorted by ->r_tid.
 241  */
 242 static void __insert_request(struct ceph_osd_client *osdc,
 243                              struct ceph_osd_request *new)
 244 {
 245         struct rb_node **p = &osdc->requests.rb_node;
 246         struct rb_node *parent = NULL;
 247         struct ceph_osd_request *req = NULL;
 248
 249         while (*p) {
 250                 parent = *p;
 251                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 252                 if (new->r_tid < req->r_tid)
 253                         p = &(*p)->rb_left;
 254                 else if (new->r_tid > req->r_tid)
 255                         p = &(*p)->rb_right;
 256                 else
 257                         BUG();
 258         }
 259
 260         rb_link_node(&new->r_node, parent, p);
 261         rb_insert_color(&new->r_node, &osdc->requests);
 262 }
 263
 264 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 265                                                  u64 tid)
 266 {
 267         struct ceph_osd_request *req;
 268         struct rb_node *n = osdc->requests.rb_node;
 269
 270         while (n) {
 271                 req = rb_entry(n, struct ceph_osd_request, r_node);
 272                 if (tid < req->r_tid)
 273                         n = n->rb_left;
 274                 else if (tid > req->r_tid)
 275                         n = n->rb_right;
 276                 else
 277                         return req;
 278         }
 279         return NULL;
 280 }
 281
 282 static struct ceph_osd_request *
 283 __lookup_request_ge(struct ceph_osd_client *osdc,
 284                     u64 tid)
 285 {
 286         struct ceph_osd_request *req;
 287         struct rb_node *n = osdc->requests.rb_node;
 288
 289         while (n) {
 290                 req = rb_entry(n, struct ceph_osd_request, r_node);
 291                 if (tid < req->r_tid) {
 292                         if (!n->rb_left)
 293                                 return req;
 294                         n = n->rb_left;
 295                 } else if (tid > req->r_tid) {
 296                         n = n->rb_right;
 297                 } else {
 298                         return req;
 299                 }
 300         }
 301         return NULL;
 302 }
 303
 304
 305 /*
 306  * If the osd connection drops, we need to resubmit all requests.
 307  */
 308 static void osd_reset(struct ceph_connection *con)
 309 {
 310         struct ceph_osd *osd = con->private;
 311         struct ceph_osd_client *osdc;
 312
 313         if (!osd)
 314                 return;
 315         dout("osd_reset osd%d\n", osd->o_osd);
 316         osdc = osd->o_osdc;
 317         down_read(&osdc->map_sem);
 318         kick_requests(osdc, osd);
 319         up_read(&osdc->map_sem);
 320 }
 321
 322 /*
 323  * Track open sessions with osds.
 324  */
 325 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
 326 {
 327         struct ceph_osd *osd;
 328
 329         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 330         if (!osd)
 331                 return NULL;
 332
 333         atomic_set(&osd->o_ref, 1);
 334         osd->o_osdc = osdc;
 335         INIT_LIST_HEAD(&osd->o_requests);
 336         INIT_LIST_HEAD(&osd->o_osd_lru);
 337         osd->o_incarnation = 1;
 338
 339         ceph_con_init(osdc->client->msgr, &osd->o_con);
 340         osd->o_con.private = osd;
 341         osd->o_con.ops = &osd_con_ops;
 342         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
 343
 344         INIT_LIST_HEAD(&osd->o_keepalive_item);
 345         return osd;
 346 }
 347
 348 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 349 {
 350         if (atomic_inc_not_zero(&osd->o_ref)) {
 351                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 352                      atomic_read(&osd->o_ref));
 353                 return osd;
 354         } else {
 355                 dout("get_osd %p FAIL\n", osd);
 356                 return NULL;
 357         }
 358 }
 359
 360 static void put_osd(struct ceph_osd *osd)
 361 {
 362         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 363              atomic_read(&osd->o_ref) - 1);
 364         if (atomic_dec_and_test(&osd->o_ref))
 365                 kfree(osd);
 366 }
 367
 368 /*
 369  * remove an osd from our map
 370  */
 371 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 372 {
 373         dout("__remove_osd %p\n", osd);
 374         BUG_ON(!list_empty(&osd->o_requests));
 375         rb_erase(&osd->o_node, &osdc->osds);
 376         list_del_init(&osd->o_osd_lru);
 377         ceph_con_close(&osd->o_con);
 378         put_osd(osd);
 379 }
 380
 381 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 382                               struct ceph_osd *osd)
 383 {
 384         dout("__move_osd_to_lru %p\n", osd);
 385         BUG_ON(!list_empty(&osd->o_osd_lru));
 386         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 387         osd->lru_ttl = jiffies + osdc->client->mount_args->osd_idle_ttl * HZ;
 388 }
 389
 390 static void __remove_osd_from_lru(struct ceph_osd *osd)
 391 {
 392         dout("__remove_osd_from_lru %p\n", osd);
 393         if (!list_empty(&osd->o_osd_lru))
 394                 list_del_init(&osd->o_osd_lru);
 395 }
 396
 397 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
 398 {
 399         struct ceph_osd *osd, *nosd;
 400
 401         dout("__remove_old_osds %p\n", osdc);
 402         mutex_lock(&osdc->request_mutex);
 403         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 404                 if (!remove_all && time_before(jiffies, osd->lru_ttl))
 405                         break;
 406                 __remove_osd(osdc, osd);
 407         }
 408         mutex_unlock(&osdc->request_mutex);
 409 }
 410
 411 /*
 412  * reset osd connect
 413  */
 414 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 415 {
 416         struct ceph_osd_request *req;
 417         int ret = 0;
 418
 419         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 420         if (list_empty(&osd->o_requests)) {
 421                 __remove_osd(osdc, osd);
 422         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
 423                           &osd->o_con.peer_addr,
 424                           sizeof(osd->o_con.peer_addr)) == 0 &&
 425                    !ceph_con_opened(&osd->o_con)) {
 426                 dout(" osd addr hasn't changed and connection never opened,"
 427                      " letting msgr retry");
 428                 /* touch each r_stamp for handle_timeout()'s benfit */
 429                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
 430                         req->r_stamp = jiffies;
 431                 ret = -EAGAIN;
 432         } else {
 433                 ceph_con_close(&osd->o_con);
 434                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
 435                 osd->o_incarnation++;
 436         }
 437         return ret;
 438 }
 439
 440 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 441 {
 442         struct rb_node **p = &osdc->osds.rb_node;
 443         struct rb_node *parent = NULL;
 444         struct ceph_osd *osd = NULL;
 445
 446         while (*p) {
 447                 parent = *p;
 448                 osd = rb_entry(parent, struct ceph_osd, o_node);
 449                 if (new->o_osd < osd->o_osd)
 450                         p = &(*p)->rb_left;
 451                 else if (new->o_osd > osd->o_osd)
 452                         p = &(*p)->rb_right;
 453                 else
 454                         BUG();
 455         }
 456
 457         rb_link_node(&new->o_node, parent, p);
 458         rb_insert_color(&new->o_node, &osdc->osds);
 459 }
 460
 461 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 462 {
 463         struct ceph_osd *osd;
 464         struct rb_node *n = osdc->osds.rb_node;
 465
 466         while (n) {
 467                 osd = rb_entry(n, struct ceph_osd, o_node);
 468                 if (o < osd->o_osd)
 469                         n = n->rb_left;
 470                 else if (o > osd->o_osd)
 471                         n = n->rb_right;
 472                 else
 473                         return osd;
 474         }
 475         return NULL;
 476 }
 477
 478 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
 479 {
 480         schedule_delayed_work(&osdc->timeout_work,
 481                         osdc->client->mount_args->osd_keepalive_timeout * HZ);
 482 }
 483
 484 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
 485 {
 486         cancel_delayed_work(&osdc->timeout_work);
 487 }
 488
 489 /*
 490  * Register request, assign tid.  If this is the first request, set up
 491  * the timeout event.
 492  */
 493 static void register_request(struct ceph_osd_client *osdc,
 494                              struct ceph_osd_request *req)
 495 {
 496         mutex_lock(&osdc->request_mutex);
 497         req->r_tid = ++osdc->last_tid;
 498         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 499         INIT_LIST_HEAD(&req->r_req_lru_item);
 500
 501         dout("register_request %p tid %lld\n", req, req->r_tid);
 502         __insert_request(osdc, req);
 503         ceph_osdc_get_request(req);
 504         osdc->num_requests++;
 505
 506         if (osdc->num_requests == 1) {
 507                 dout(" first request, scheduling timeout\n");
 508                 __schedule_osd_timeout(osdc);
 509         }
 510         mutex_unlock(&osdc->request_mutex);
 511 }
 512
 513 /*
 514  * called under osdc->request_mutex
 515  */
 516 static void __unregister_request(struct ceph_osd_client *osdc,
 517                                  struct ceph_osd_request *req)
 518 {
 519         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 520         rb_erase(&req->r_node, &osdc->requests);
 521         osdc->num_requests--;
 522
 523         if (req->r_osd) {
 524                 /* make sure the original request isn't in flight. */
 525                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 526
 527                 list_del_init(&req->r_osd_item);
 528                 if (list_empty(&req->r_osd->o_requests))
 529                         __move_osd_to_lru(osdc, req->r_osd);
 530                 req->r_osd = NULL;
 531         }
 532
 533         ceph_osdc_put_request(req);
 534
 535         list_del_init(&req->r_req_lru_item);
 536         if (osdc->num_requests == 0) {
 537                 dout(" no requests, canceling timeout\n");
 538                 __cancel_osd_timeout(osdc);
 539         }
 540 }
 541
 542 /*
 543  * Cancel a previously queued request message
 544  */
 545 static void __cancel_request(struct ceph_osd_request *req)
 546 {
 547         if (req->r_sent) {
 548                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 549                 req->r_sent = 0;
 550         }
 551         list_del_init(&req->r_req_lru_item);
 552 }
 553
 554 /*
 555  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 556  * (as needed), and set the request r_osd appropriately.  If there is
 557  * no up osd, set r_osd to NULL.
 558  *
 559  * Return 0 if unchanged, 1 if changed, or negative on error.
 560  *
 561  * Caller should hold map_sem for read and request_mutex.
 562  */
 563 static int __map_osds(struct ceph_osd_client *osdc,
 564                       struct ceph_osd_request *req)
 565 {
 566         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 567         struct ceph_pg pgid;
 568         int o = -1;
 569         int err;
 570
 571         dout("map_osds %p tid %lld\n", req, req->r_tid);
 572         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 573                                       &req->r_file_layout, osdc->osdmap);
 574         if (err)
 575                 return err;
 576         pgid = reqhead->layout.ol_pgid;
 577         req->r_pgid = pgid;
 578
 579         o = ceph_calc_pg_primary(osdc->osdmap, pgid);
 580
 581         if ((req->r_osd && req->r_osd->o_osd == o &&
 582              req->r_sent >= req->r_osd->o_incarnation) ||
 583             (req->r_osd == NULL && o == -1))
 584                 return 0;  /* no change */
 585
 586         dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
 587              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 588              req->r_osd ? req->r_osd->o_osd : -1);
 589
 590         if (req->r_osd) {
 591                 __cancel_request(req);
 592                 list_del_init(&req->r_osd_item);
 593                 req->r_osd = NULL;
 594         }
 595
 596         req->r_osd = __lookup_osd(osdc, o);
 597         if (!req->r_osd && o >= 0) {
 598                 err = -ENOMEM;
 599                 req->r_osd = create_osd(osdc);
 600                 if (!req->r_osd)
 601                         goto out;
 602
 603                 dout("map_osds osd %p is osd%d\n", req->r_osd, o);
 604                 req->r_osd->o_osd = o;
 605                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
 606                 __insert_osd(osdc, req->r_osd);
 607
 608                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
 609         }
 610
 611         if (req->r_osd) {
 612                 __remove_osd_from_lru(req->r_osd);
 613                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 614         }
 615         err = 1;   /* osd changed */
 616
 617 out:
 618         return err;
 619 }
 620
 621 /*
 622  * caller should hold map_sem (for read) and request_mutex
 623  */
 624 static int __send_request(struct ceph_osd_client *osdc,
 625                           struct ceph_osd_request *req)
 626 {
 627         struct ceph_osd_request_head *reqhead;
 628         int err;
 629
 630         err = __map_osds(osdc, req);
 631         if (err < 0)
 632                 return err;
 633         if (req->r_osd == NULL) {
 634                 dout("send_request %p no up osds in pg\n", req);
 635                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 636                 return 0;
 637         }
 638
 639         dout("send_request %p tid %llu to osd%d flags %d\n",
 640              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
 641
 642         reqhead = req->r_request->front.iov_base;
 643         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
 644         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
 645         reqhead->reassert_version = req->r_reassert_version;
 646
 647         req->r_stamp = jiffies;
 648         list_move_tail(&osdc->req_lru, &req->r_req_lru_item);
 649
 650         ceph_msg_get(req->r_request); /* send consumes a ref */
 651         ceph_con_send(&req->r_osd->o_con, req->r_request);
 652         req->r_sent = req->r_osd->o_incarnation;
 653         return 0;
 654 }
 655
 656 /*
 657  * Timeout callback, called every N seconds when 1 or more osd
 658  * requests has been active for more than N seconds.  When this
 659  * happens, we ping all OSDs with requests who have timed out to
 660  * ensure any communications channel reset is detected.  Reset the
 661  * request timeouts another N seconds in the future as we go.
 662  * Reschedule the timeout event another N seconds in future (unless
 663  * there are no open requests).
 664  */
 665 static void handle_timeout(struct work_struct *work)
 666 {
 667         struct ceph_osd_client *osdc =
 668                 container_of(work, struct ceph_osd_client, timeout_work.work);
 669         struct ceph_osd_request *req, *last_req = NULL;
 670         struct ceph_osd *osd;
 671         unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
 672         unsigned long keepalive =
 673                 osdc->client->mount_args->osd_keepalive_timeout * HZ;
 674         unsigned long last_stamp = 0;
 675         struct rb_node *p;
 676         struct list_head slow_osds;
 677
 678         dout("timeout\n");
 679         down_read(&osdc->map_sem);
 680
 681         ceph_monc_request_next_osdmap(&osdc->client->monc);
 682
 683         mutex_lock(&osdc->request_mutex);
 684         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 685                 req = rb_entry(p, struct ceph_osd_request, r_node);
 686
 687                 if (req->r_resend) {
 688                         int err;
 689
 690                         dout("osdc resending prev failed %lld\n", req->r_tid);
 691                         err = __send_request(osdc, req);
 692                         if (err)
 693                                 dout("osdc failed again on %lld\n", req->r_tid);
 694                         else
 695                                 req->r_resend = false;
 696                         continue;
 697                 }
 698         }
 699
 700         /*
 701          * reset osds that appear to be _really_ unresponsive.  this
 702          * is a failsafe measure.. we really shouldn't be getting to
 703          * this point if the system is working properly.  the monitors
 704          * should mark the osd as failed and we should find out about
 705          * it from an updated osd map.
 706          */
 707         while (!list_empty(&osdc->req_lru)) {
 708                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
 709                                  r_req_lru_item);
 710
 711                 if (time_before(jiffies, req->r_stamp + timeout))
 712                         break;
 713
 714                 BUG_ON(req == last_req && req->r_stamp == last_stamp);
 715                 last_req = req;
 716                 last_stamp = req->r_stamp;
 717
 718                 osd = req->r_osd;
 719                 BUG_ON(!osd);
 720                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
 721                            req->r_tid, osd->o_osd);
 722                 __kick_requests(osdc, osd);
 723         }
 724
 725         /*
 726          * ping osds that are a bit slow.  this ensures that if there
 727          * is a break in the TCP connection we will notice, and reopen
 728          * a connection with that osd (from the fault callback).
 729          */
 730         INIT_LIST_HEAD(&slow_osds);
 731         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
 732                 if (time_before(jiffies, req->r_stamp + keepalive))
 733                         break;
 734
 735                 osd = req->r_osd;
 736                 BUG_ON(!osd);
 737                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
 738                      req->r_tid, osd->o_osd);
 739                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
 740         }
 741         while (!list_empty(&slow_osds)) {
 742                 osd = list_entry(slow_osds.next, struct ceph_osd,
 743                                  o_keepalive_item);
 744                 list_del_init(&osd->o_keepalive_item);
 745                 ceph_con_keepalive(&osd->o_con);
 746         }
 747
 748         __schedule_osd_timeout(osdc);
 749         mutex_unlock(&osdc->request_mutex);
 750
 751         up_read(&osdc->map_sem);
 752 }
 753
 754 static void handle_osds_timeout(struct work_struct *work)
 755 {
 756         struct ceph_osd_client *osdc =
 757                 container_of(work, struct ceph_osd_client,
 758                              osds_timeout_work.work);
 759         unsigned long delay =
 760                 osdc->client->mount_args->osd_idle_ttl * HZ >> 2;
 761
 762         dout("osds timeout\n");
 763         down_read(&osdc->map_sem);
 764         remove_old_osds(osdc, 0);
 765         up_read(&osdc->map_sem);
 766
 767         schedule_delayed_work(&osdc->osds_timeout_work,
 768                               round_jiffies_relative(delay));
 769 }
 770
 771 /*
 772  * handle osd op reply.  either call the callback if it is specified,
 773  * or do the completion to wake up the waiting thread.
 774  */
 775 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
 776                          struct ceph_connection *con)
 777 {
 778         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
 779         struct ceph_osd_request *req;
 780         u64 tid;
 781         int numops, object_len, flags;
 782         s32 result;
 783
 784         tid = le64_to_cpu(msg->hdr.tid);
 785         if (msg->front.iov_len < sizeof(*rhead))
 786                 goto bad;
 787         numops = le32_to_cpu(rhead->num_ops);
 788         object_len = le32_to_cpu(rhead->object_len);
 789         result = le32_to_cpu(rhead->result);
 790         if (msg->front.iov_len != sizeof(*rhead) + object_len +
 791             numops * sizeof(struct ceph_osd_op))
 792                 goto bad;
 793         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
 794
 795         /* lookup */
 796         mutex_lock(&osdc->request_mutex);
 797         req = __lookup_request(osdc, tid);
 798         if (req == NULL) {
 799                 dout("handle_reply tid %llu dne\n", tid);
 800                 mutex_unlock(&osdc->request_mutex);
 801                 return;
 802         }
 803         ceph_osdc_get_request(req);
 804         flags = le32_to_cpu(rhead->flags);
 805
 806         /*
 807          * if this connection filled our message, drop our reference now, to
 808          * avoid a (safe but slower) revoke later.
 809          */
 810         if (req->r_con_filling_msg == con && req->r_reply == msg) {
 811                 dout(" dropping con_filling_msg ref %p\n", con);
 812                 req->r_con_filling_msg = NULL;
 813                 ceph_con_put(con);
 814         }
 815
 816         if (!req->r_got_reply) {
 817                 unsigned bytes;
 818
 819                 req->r_result = le32_to_cpu(rhead->result);
 820                 bytes = le32_to_cpu(msg->hdr.data_len);
 821                 dout("handle_reply result %d bytes %d\n", req->r_result,
 822                      bytes);
 823                 if (req->r_result == 0)
 824                         req->r_result = bytes;
 825
 826                 /* in case this is a write and we need to replay, */
 827                 req->r_reassert_version = rhead->reassert_version;
 828
 829                 req->r_got_reply = 1;
 830         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
 831                 dout("handle_reply tid %llu dup ack\n", tid);
 832                 mutex_unlock(&osdc->request_mutex);
 833                 goto done;
 834         }
 835
 836         dout("handle_reply tid %llu flags %d\n", tid, flags);
 837
 838         /* either this is a read, or we got the safe response */
 839         if (result < 0 ||
 840             (flags & CEPH_OSD_FLAG_ONDISK) ||
 841             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
 842                 __unregister_request(osdc, req);
 843
 844         mutex_unlock(&osdc->request_mutex);
 845
 846         if (req->r_callback)
 847                 req->r_callback(req, msg);
 848         else
 849                 complete(&req->r_completion);
 850
 851         if (flags & CEPH_OSD_FLAG_ONDISK) {
 852                 if (req->r_safe_callback)
 853                         req->r_safe_callback(req, msg);
 854                 complete(&req->r_safe_completion);  /* fsync waiter */
 855         }
 856
 857 done:
 858         ceph_osdc_put_request(req);
 859         return;
 860
 861 bad:
 862         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
 863                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
 864                (int)sizeof(*rhead));
 865         ceph_msg_dump(msg);
 866 }
 867
 868
 869 static int __kick_requests(struct ceph_osd_client *osdc,
 870                           struct ceph_osd *kickosd)
 871 {
 872         struct ceph_osd_request *req;
 873         struct rb_node *p, *n;
 874         int needmap = 0;
 875         int err;
 876
 877         dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
 878         if (kickosd) {
 879                 err = __reset_osd(osdc, kickosd);
 880                 if (err == -EAGAIN)
 881                         return 1;
 882         } else {
 883                 for (p = rb_first(&osdc->osds); p; p = n) {
 884                         struct ceph_osd *osd =
 885                                 rb_entry(p, struct ceph_osd, o_node);
 886
 887                         n = rb_next(p);
 888                         if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
 889                             memcmp(&osd->o_con.peer_addr,
 890                                    ceph_osd_addr(osdc->osdmap,
 891                                                  osd->o_osd),
 892                                    sizeof(struct ceph_entity_addr)) != 0)
 893                                 __reset_osd(osdc, osd);
 894                 }
 895         }
 896
 897         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 898                 req = rb_entry(p, struct ceph_osd_request, r_node);
 899
 900                 if (req->r_resend) {
 901                         dout(" r_resend set on tid %llu\n", req->r_tid);
 902                         __cancel_request(req);
 903                         goto kick;
 904                 }
 905                 if (req->r_osd && kickosd == req->r_osd) {
 906                         __cancel_request(req);
 907                         goto kick;
 908                 }
 909
 910                 err = __map_osds(osdc, req);
 911                 if (err == 0)
 912                         continue;  /* no change */
 913                 if (err < 0) {
 914                         /*
 915                          * FIXME: really, we should set the request
 916                          * error and fail if this isn't a 'nofail'
 917                          * request, but that's a fair bit more
 918                          * complicated to do.  So retry!
 919                          */
 920                         dout(" setting r_resend on %llu\n", req->r_tid);
 921                         req->r_resend = true;
 922                         continue;
 923                 }
 924                 if (req->r_osd == NULL) {
 925                         dout("tid %llu maps to no valid osd\n", req->r_tid);
 926                         needmap++;  /* request a newer map */
 927                         continue;
 928                 }
 929
 930 kick:
 931                 dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
 932                      req->r_osd ? req->r_osd->o_osd : -1);
 933                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
 934                 err = __send_request(osdc, req);
 935                 if (err) {
 936                         dout(" setting r_resend on %llu\n", req->r_tid);
 937                         req->r_resend = true;
 938                 }
 939         }
 940
 941         return needmap;
 942 }
 943
 944 /*
 945  * Resubmit osd requests whose osd or osd address has changed.  Request
 946  * a new osd map if osds are down, or we are otherwise unable to determine
 947  * how to direct a request.
 948  *
 949  * Close connections to down osds.
 950  *
 951  * If @who is specified, resubmit requests for that specific osd.
 952  *
 953  * Caller should hold map_sem for read and request_mutex.
 954  */
 955 static void kick_requests(struct ceph_osd_client *osdc,
 956                           struct ceph_osd *kickosd)
 957 {
 958         int needmap;
 959
 960         mutex_lock(&osdc->request_mutex);
 961         needmap = __kick_requests(osdc, kickosd);
 962         mutex_unlock(&osdc->request_mutex);
 963
 964         if (needmap) {
 965                 dout("%d requests for down osds, need new map\n", needmap);
 966                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 967         }
 968
 969 }
 970 /*
 971  * Process updated osd map.
 972  *
 973  * The message contains any number of incremental and full maps, normally
 974  * indicating some sort of topology change in the cluster.  Kick requests
 975  * off to different OSDs as needed.
 976  */
 977 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 978 {
 979         void *p, *end, *next;
 980         u32 nr_maps, maplen;
 981         u32 epoch;
 982         struct ceph_osdmap *newmap = NULL, *oldmap;
 983         int err;
 984         struct ceph_fsid fsid;
 985
 986         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
 987         p = msg->front.iov_base;
 988         end = p + msg->front.iov_len;
 989
 990         /* verify fsid */
 991         ceph_decode_need(&p, end, sizeof(fsid), bad);
 992         ceph_decode_copy(&p, &fsid, sizeof(fsid));
 993         if (ceph_check_fsid(osdc->client, &fsid) < 0)
 994                 return;
 995
 996         down_write(&osdc->map_sem);
 997
 998         /* incremental maps */
 999         ceph_decode_32_safe(&p, end, nr_maps, bad);
1000         dout(" %d inc maps\n", nr_maps);
1001         while (nr_maps > 0) {
1002                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1003                 epoch = ceph_decode_32(&p);
1004                 maplen = ceph_decode_32(&p);
1005                 ceph_decode_need(&p, end, maplen, bad);
1006                 next = p + maplen;
1007                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1008                         dout("applying incremental map %u len %d\n",
1009                              epoch, maplen);
1010                         newmap = osdmap_apply_incremental(&p, next,
1011                                                           osdc->osdmap,
1012                                                           osdc->client->msgr);
1013                         if (IS_ERR(newmap)) {
1014                                 err = PTR_ERR(newmap);
1015                                 goto bad;
1016                         }
1017                         BUG_ON(!newmap);
1018                         if (newmap != osdc->osdmap) {
1019                                 ceph_osdmap_destroy(osdc->osdmap);
1020                                 osdc->osdmap = newmap;
1021                         }
1022                 } else {
1023                         dout("ignoring incremental map %u len %d\n",
1024                              epoch, maplen);
1025                 }
1026                 p = next;
1027                 nr_maps--;
1028         }
1029         if (newmap)
1030                 goto done;
1031
1032         /* full maps */
1033         ceph_decode_32_safe(&p, end, nr_maps, bad);
1034         dout(" %d full maps\n", nr_maps);
1035         while (nr_maps) {
1036                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1037                 epoch = ceph_decode_32(&p);
1038                 maplen = ceph_decode_32(&p);
1039                 ceph_decode_need(&p, end, maplen, bad);
1040                 if (nr_maps > 1) {
1041                         dout("skipping non-latest full map %u len %d\n",
1042                              epoch, maplen);
1043                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1044                         dout("skipping full map %u len %d, "
1045                              "older than our %u\n", epoch, maplen,
1046                              osdc->osdmap->epoch);
1047                 } else {
1048                         dout("taking full map %u len %d\n", epoch, maplen);
1049                         newmap = osdmap_decode(&p, p+maplen);
1050                         if (IS_ERR(newmap)) {
1051                                 err = PTR_ERR(newmap);
1052                                 goto bad;
1053                         }
1054                         BUG_ON(!newmap);
1055                         oldmap = osdc->osdmap;
1056                         osdc->osdmap = newmap;
1057                         if (oldmap)
1058                                 ceph_osdmap_destroy(oldmap);
1059                 }
1060                 p += maplen;
1061                 nr_maps--;
1062         }
1063
1064 done:
1065         downgrade_write(&osdc->map_sem);
1066         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1067         if (newmap)
1068                 kick_requests(osdc, NULL);
1069         up_read(&osdc->map_sem);
1070         return;
1071
1072 bad:
1073         pr_err("osdc handle_map corrupt msg\n");
1074         ceph_msg_dump(msg);
1075         up_write(&osdc->map_sem);
1076         return;
1077 }
1078
1079
1080 /*
1081  * A read request prepares specific pages that data is to be read into.
1082  * When a message is being read off the wire, we call prepare_pages to
1083  * find those pages.
1084  *  0 = success, -1 failure.
1085  */
1086 static int __prepare_pages(struct ceph_connection *con,
1087                          struct ceph_msg_header *hdr,
1088                          struct ceph_osd_request *req,
1089                          u64 tid,
1090                          struct ceph_msg *m)
1091 {
1092         struct ceph_osd *osd = con->private;
1093         struct ceph_osd_client *osdc;
1094         int ret = -1;
1095         int data_len = le32_to_cpu(hdr->data_len);
1096         unsigned data_off = le16_to_cpu(hdr->data_off);
1097
1098         int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
1099
1100         if (!osd)
1101                 return -1;
1102
1103         osdc = osd->o_osdc;
1104
1105         dout("__prepare_pages on msg %p tid %llu, has %d pages, want %d\n", m,
1106              tid, req->r_num_pages, want);
1107         if (unlikely(req->r_num_pages < want))
1108                 goto out;
1109         m->pages = req->r_pages;
1110         m->nr_pages = req->r_num_pages;
1111         ret = 0; /* success */
1112 out:
1113         BUG_ON(ret < 0 || m->nr_pages < want);
1114
1115         return ret;
1116 }
1117
1118 /*
1119  * Register request, send initial attempt.
1120  */
1121 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1122                             struct ceph_osd_request *req,
1123                             bool nofail)
1124 {
1125         int rc = 0;
1126
1127         req->r_request->pages = req->r_pages;
1128         req->r_request->nr_pages = req->r_num_pages;
1129
1130         register_request(osdc, req);
1131
1132         down_read(&osdc->map_sem);
1133         mutex_lock(&osdc->request_mutex);
1134         /*
1135          * a racing kick_requests() may have sent the message for us
1136          * while we dropped request_mutex above, so only send now if
1137          * the request still han't been touched yet.
1138          */
1139         if (req->r_sent == 0) {
1140                 rc = __send_request(osdc, req);
1141                 if (rc) {
1142                         if (nofail) {
1143                                 dout("osdc_start_request failed send, "
1144                                      " marking %lld\n", req->r_tid);
1145                                 req->r_resend = true;
1146                                 rc = 0;
1147                         } else {
1148                                 __unregister_request(osdc, req);
1149                         }
1150                 }
1151         }
1152         mutex_unlock(&osdc->request_mutex);
1153         up_read(&osdc->map_sem);
1154         return rc;
1155 }
1156
1157 /*
1158  * wait for a request to complete
1159  */
1160 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1161                            struct ceph_osd_request *req)
1162 {
1163         int rc;
1164
1165         rc = wait_for_completion_interruptible(&req->r_completion);
1166         if (rc < 0) {
1167                 mutex_lock(&osdc->request_mutex);
1168                 __cancel_request(req);
1169                 __unregister_request(osdc, req);
1170                 mutex_unlock(&osdc->request_mutex);
1171                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1172                 return rc;
1173         }
1174
1175         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1176         return req->r_result;
1177 }
1178
1179 /*
1180  * sync - wait for all in-flight requests to flush.  avoid starvation.
1181  */
1182 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1183 {
1184         struct ceph_osd_request *req;
1185         u64 last_tid, next_tid = 0;
1186
1187         mutex_lock(&osdc->request_mutex);
1188         last_tid = osdc->last_tid;
1189         while (1) {
1190                 req = __lookup_request_ge(osdc, next_tid);
1191                 if (!req)
1192                         break;
1193                 if (req->r_tid > last_tid)
1194                         break;
1195
1196                 next_tid = req->r_tid + 1;
1197                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1198                         continue;
1199
1200                 ceph_osdc_get_request(req);
1201                 mutex_unlock(&osdc->request_mutex);
1202                 dout("sync waiting on tid %llu (last is %llu)\n",
1203                      req->r_tid, last_tid);
1204                 wait_for_completion(&req->r_safe_completion);
1205                 mutex_lock(&osdc->request_mutex);
1206                 ceph_osdc_put_request(req);
1207         }
1208         mutex_unlock(&osdc->request_mutex);
1209         dout("sync done (thru tid %llu)\n", last_tid);
1210 }
1211
1212 /*
1213  * init, shutdown
1214  */
1215 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1216 {
1217         int err;
1218
1219         dout("init\n");
1220         osdc->client = client;
1221         osdc->osdmap = NULL;
1222         init_rwsem(&osdc->map_sem);
1223         init_completion(&osdc->map_waiters);
1224         osdc->last_requested_map = 0;
1225         mutex_init(&osdc->request_mutex);
1226         osdc->last_tid = 0;
1227         osdc->osds = RB_ROOT;
1228         INIT_LIST_HEAD(&osdc->osd_lru);
1229         osdc->requests = RB_ROOT;
1230         INIT_LIST_HEAD(&osdc->req_lru);
1231         osdc->num_requests = 0;
1232         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1233         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1234
1235         schedule_delayed_work(&osdc->osds_timeout_work,
1236            round_jiffies_relative(osdc->client->mount_args->osd_idle_ttl * HZ));
1237
1238         err = -ENOMEM;
1239         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1240                                         sizeof(struct ceph_osd_request));
1241         if (!osdc->req_mempool)
1242                 goto out;
1243
1244         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true);
1245         if (err < 0)
1246                 goto out_mempool;
1247         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1248                                 OSD_OPREPLY_FRONT_LEN, 10, true);
1249         if (err < 0)
1250                 goto out_msgpool;
1251         return 0;
1252
1253 out_msgpool:
1254         ceph_msgpool_destroy(&osdc->msgpool_op);
1255 out_mempool:
1256         mempool_destroy(osdc->req_mempool);
1257 out:
1258         return err;
1259 }
1260
1261 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1262 {
1263         cancel_delayed_work_sync(&osdc->timeout_work);
1264         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1265         if (osdc->osdmap) {
1266                 ceph_osdmap_destroy(osdc->osdmap);
1267                 osdc->osdmap = NULL;
1268         }
1269         remove_old_osds(osdc, 1);
1270         mempool_destroy(osdc->req_mempool);
1271         ceph_msgpool_destroy(&osdc->msgpool_op);
1272         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1273 }
1274
1275 /*
1276  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1277  * *plen.  Return number of bytes read, or error.
1278  */
1279 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1280                         struct ceph_vino vino, struct ceph_file_layout *layout,
1281                         u64 off, u64 *plen,
1282                         u32 truncate_seq, u64 truncate_size,
1283                         struct page **pages, int num_pages)
1284 {
1285         struct ceph_osd_request *req;
1286         int rc = 0;
1287
1288         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1289              vino.snap, off, *plen);
1290         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1291                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1292                                     NULL, 0, truncate_seq, truncate_size, NULL,
1293                                     false, 1);
1294         if (IS_ERR(req))
1295                 return PTR_ERR(req);
1296
1297         /* it may be a short read due to an object boundary */
1298         req->r_pages = pages;
1299         num_pages = calc_pages_for(off, *plen);
1300         req->r_num_pages = num_pages;
1301
1302         dout("readpages  final extent is %llu~%llu (%d pages)\n",
1303              off, *plen, req->r_num_pages);
1304
1305         rc = ceph_osdc_start_request(osdc, req, false);
1306         if (!rc)
1307                 rc = ceph_osdc_wait_request(osdc, req);
1308
1309         ceph_osdc_put_request(req);
1310         dout("readpages result %d\n", rc);
1311         return rc;
1312 }
1313
1314 /*
1315  * do a synchronous write on N pages
1316  */
1317 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1318                          struct ceph_file_layout *layout,
1319                          struct ceph_snap_context *snapc,
1320                          u64 off, u64 len,
1321                          u32 truncate_seq, u64 truncate_size,
1322                          struct timespec *mtime,
1323                          struct page **pages, int num_pages,
1324                          int flags, int do_sync, bool nofail)
1325 {
1326         struct ceph_osd_request *req;
1327         int rc = 0;
1328
1329         BUG_ON(vino.snap != CEPH_NOSNAP);
1330         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1331                                     CEPH_OSD_OP_WRITE,
1332                                     flags | CEPH_OSD_FLAG_ONDISK |
1333                                             CEPH_OSD_FLAG_WRITE,
1334                                     snapc, do_sync,
1335                                     truncate_seq, truncate_size, mtime,
1336                                     nofail, 1);
1337         if (IS_ERR(req))
1338                 return PTR_ERR(req);
1339
1340         /* it may be a short write due to an object boundary */
1341         req->r_pages = pages;
1342         req->r_num_pages = calc_pages_for(off, len);
1343         dout("writepages %llu~%llu (%d pages)\n", off, len,
1344              req->r_num_pages);
1345
1346         rc = ceph_osdc_start_request(osdc, req, nofail);
1347         if (!rc)
1348                 rc = ceph_osdc_wait_request(osdc, req);
1349
1350         ceph_osdc_put_request(req);
1351         if (rc == 0)
1352                 rc = len;
1353         dout("writepages result %d\n", rc);
1354         return rc;
1355 }
1356
1357 /*
1358  * handle incoming message
1359  */
1360 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1361 {
1362         struct ceph_osd *osd = con->private;
1363         struct ceph_osd_client *osdc;
1364         int type = le16_to_cpu(msg->hdr.type);
1365
1366         if (!osd)
1367                 return;
1368         osdc = osd->o_osdc;
1369
1370         switch (type) {
1371         case CEPH_MSG_OSD_MAP:
1372                 ceph_osdc_handle_map(osdc, msg);
1373                 break;
1374         case CEPH_MSG_OSD_OPREPLY:
1375                 handle_reply(osdc, msg, con);
1376                 break;
1377
1378         default:
1379                 pr_err("received unknown message type %d %s\n", type,
1380                        ceph_msg_type_name(type));
1381         }
1382         ceph_msg_put(msg);
1383 }
1384
1385 /*
1386  * lookup and return message for incoming reply
1387  */
1388 static struct ceph_msg *get_reply(struct ceph_connection *con,
1389                                   struct ceph_msg_header *hdr,
1390                                   int *skip)
1391 {
1392         struct ceph_osd *osd = con->private;
1393         struct ceph_osd_client *osdc = osd->o_osdc;
1394         struct ceph_msg *m;
1395         struct ceph_osd_request *req;
1396         int front = le32_to_cpu(hdr->front_len);
1397         int data_len = le32_to_cpu(hdr->data_len);
1398         u64 tid;
1399         int err;
1400
1401         tid = le64_to_cpu(hdr->tid);
1402         mutex_lock(&osdc->request_mutex);
1403         req = __lookup_request(osdc, tid);
1404         if (!req) {
1405                 *skip = 1;
1406                 m = NULL;
1407                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1408                         osd->o_osd);
1409                 goto out;
1410         }
1411
1412         if (req->r_con_filling_msg) {
1413                 dout("get_reply revoking msg %p from old con %p\n",
1414                      req->r_reply, req->r_con_filling_msg);
1415                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
1416                 ceph_con_put(req->r_con_filling_msg);
1417         }
1418
1419         if (front > req->r_reply->front.iov_len) {
1420                 pr_warning("get_reply front %d > preallocated %d\n",
1421                            front, (int)req->r_reply->front.iov_len);
1422                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, 0, 0, NULL);
1423                 if (IS_ERR(m))
1424                         goto out;
1425                 ceph_msg_put(req->r_reply);
1426                 req->r_reply = m;
1427         }
1428         m = ceph_msg_get(req->r_reply);
1429
1430         if (data_len > 0) {
1431                 err = __prepare_pages(con, hdr, req, tid, m);
1432                 if (err < 0) {
1433                         *skip = 1;
1434                         ceph_msg_put(m);
1435                         m = ERR_PTR(err);
1436                 }
1437         }
1438         *skip = 0;
1439         req->r_con_filling_msg = ceph_con_get(con);
1440         dout("get_reply tid %lld %p\n", tid, m);
1441
1442 out:
1443         mutex_unlock(&osdc->request_mutex);
1444         return m;
1445
1446 }
1447
1448 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
1449                                   struct ceph_msg_header *hdr,
1450                                   int *skip)
1451 {
1452         struct ceph_osd *osd = con->private;
1453         int type = le16_to_cpu(hdr->type);
1454         int front = le32_to_cpu(hdr->front_len);
1455
1456         switch (type) {
1457         case CEPH_MSG_OSD_MAP:
1458                 return ceph_msg_new(type, front, 0, 0, NULL);
1459         case CEPH_MSG_OSD_OPREPLY:
1460                 return get_reply(con, hdr, skip);
1461         default:
1462                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
1463                         osd->o_osd);
1464                 *skip = 1;
1465                 return NULL;
1466         }
1467 }
1468
1469 /*
1470  * Wrappers to refcount containing ceph_osd struct
1471  */
1472 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
1473 {
1474         struct ceph_osd *osd = con->private;
1475         if (get_osd(osd))
1476                 return con;
1477         return NULL;
1478 }
1479
1480 static void put_osd_con(struct ceph_connection *con)
1481 {
1482         struct ceph_osd *osd = con->private;
1483         put_osd(osd);
1484 }
1485
1486 /*
1487  * authentication
1488  */
1489 static int get_authorizer(struct ceph_connection *con,
1490                           void **buf, int *len, int *proto,
1491                           void **reply_buf, int *reply_len, int force_new)
1492 {
1493         struct ceph_osd *o = con->private;
1494         struct ceph_osd_client *osdc = o->o_osdc;
1495         struct ceph_auth_client *ac = osdc->client->monc.auth;
1496         int ret = 0;
1497
1498         if (force_new && o->o_authorizer) {
1499                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
1500                 o->o_authorizer = NULL;
1501         }
1502         if (o->o_authorizer == NULL) {
1503                 ret = ac->ops->create_authorizer(
1504                         ac, CEPH_ENTITY_TYPE_OSD,
1505                         &o->o_authorizer,
1506                         &o->o_authorizer_buf,
1507                         &o->o_authorizer_buf_len,
1508                         &o->o_authorizer_reply_buf,
1509                         &o->o_authorizer_reply_buf_len);
1510                 if (ret)
1511                 return ret;
1512         }
1513
1514         *proto = ac->protocol;
1515         *buf = o->o_authorizer_buf;
1516         *len = o->o_authorizer_buf_len;
1517         *reply_buf = o->o_authorizer_reply_buf;
1518         *reply_len = o->o_authorizer_reply_buf_len;
1519         return 0;
1520 }
1521
1522
1523 static int verify_authorizer_reply(struct ceph_connection *con, int len)
1524 {
1525         struct ceph_osd *o = con->private;
1526         struct ceph_osd_client *osdc = o->o_osdc;
1527         struct ceph_auth_client *ac = osdc->client->monc.auth;
1528
1529         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
1530 }
1531
1532 static int invalidate_authorizer(struct ceph_connection *con)
1533 {
1534         struct ceph_osd *o = con->private;
1535         struct ceph_osd_client *osdc = o->o_osdc;
1536         struct ceph_auth_client *ac = osdc->client->monc.auth;
1537
1538         if (ac->ops->invalidate_authorizer)
1539                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
1540
1541         return ceph_monc_validate_auth(&osdc->client->monc);
1542 }
1543
1544 const static struct ceph_connection_operations osd_con_ops = {
1545         .get = get_osd_con,
1546         .put = put_osd_con,
1547         .dispatch = dispatch,
1548         .get_authorizer = get_authorizer,
1549         .verify_authorizer_reply = verify_authorizer_reply,
1550         .invalidate_authorizer = invalidate_authorizer,
1551         .alloc_msg = alloc_msg,
1552         .fault = osd_reset,
1553 };