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         int ret = 0;
 417
 418         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 419         if (list_empty(&osd->o_requests)) {
 420                 __remove_osd(osdc, osd);
 421         } else {
 422                 ceph_con_close(&osd->o_con);
 423                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
 424                 osd->o_incarnation++;
 425         }
 426         return ret;
 427 }
 428
 429 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 430 {
 431         struct rb_node **p = &osdc->osds.rb_node;
 432         struct rb_node *parent = NULL;
 433         struct ceph_osd *osd = NULL;
 434
 435         while (*p) {
 436                 parent = *p;
 437                 osd = rb_entry(parent, struct ceph_osd, o_node);
 438                 if (new->o_osd < osd->o_osd)
 439                         p = &(*p)->rb_left;
 440                 else if (new->o_osd > osd->o_osd)
 441                         p = &(*p)->rb_right;
 442                 else
 443                         BUG();
 444         }
 445
 446         rb_link_node(&new->o_node, parent, p);
 447         rb_insert_color(&new->o_node, &osdc->osds);
 448 }
 449
 450 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 451 {
 452         struct ceph_osd *osd;
 453         struct rb_node *n = osdc->osds.rb_node;
 454
 455         while (n) {
 456                 osd = rb_entry(n, struct ceph_osd, o_node);
 457                 if (o < osd->o_osd)
 458                         n = n->rb_left;
 459                 else if (o > osd->o_osd)
 460                         n = n->rb_right;
 461                 else
 462                         return osd;
 463         }
 464         return NULL;
 465 }
 466
 467 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
 468 {
 469         schedule_delayed_work(&osdc->timeout_work,
 470                         osdc->client->mount_args->osd_keepalive_timeout * HZ);
 471 }
 472
 473 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
 474 {
 475         cancel_delayed_work(&osdc->timeout_work);
 476 }
 477
 478 /*
 479  * Register request, assign tid.  If this is the first request, set up
 480  * the timeout event.
 481  */
 482 static void register_request(struct ceph_osd_client *osdc,
 483                              struct ceph_osd_request *req)
 484 {
 485         mutex_lock(&osdc->request_mutex);
 486         req->r_tid = ++osdc->last_tid;
 487         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 488         INIT_LIST_HEAD(&req->r_req_lru_item);
 489
 490         dout("register_request %p tid %lld\n", req, req->r_tid);
 491         __insert_request(osdc, req);
 492         ceph_osdc_get_request(req);
 493         osdc->num_requests++;
 494
 495         if (osdc->num_requests == 1) {
 496                 dout(" first request, scheduling timeout\n");
 497                 __schedule_osd_timeout(osdc);
 498         }
 499         mutex_unlock(&osdc->request_mutex);
 500 }
 501
 502 /*
 503  * called under osdc->request_mutex
 504  */
 505 static void __unregister_request(struct ceph_osd_client *osdc,
 506                                  struct ceph_osd_request *req)
 507 {
 508         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 509         rb_erase(&req->r_node, &osdc->requests);
 510         osdc->num_requests--;
 511
 512         if (req->r_osd) {
 513                 /* make sure the original request isn't in flight. */
 514                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 515
 516                 list_del_init(&req->r_osd_item);
 517                 if (list_empty(&req->r_osd->o_requests))
 518                         __move_osd_to_lru(osdc, req->r_osd);
 519                 req->r_osd = NULL;
 520         }
 521
 522         ceph_osdc_put_request(req);
 523
 524         list_del_init(&req->r_req_lru_item);
 525         if (osdc->num_requests == 0) {
 526                 dout(" no requests, canceling timeout\n");
 527                 __cancel_osd_timeout(osdc);
 528         }
 529 }
 530
 531 /*
 532  * Cancel a previously queued request message
 533  */
 534 static void __cancel_request(struct ceph_osd_request *req)
 535 {
 536         if (req->r_sent) {
 537                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 538                 req->r_sent = 0;
 539         }
 540         list_del_init(&req->r_req_lru_item);
 541 }
 542
 543 /*
 544  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 545  * (as needed), and set the request r_osd appropriately.  If there is
 546  * no up osd, set r_osd to NULL.
 547  *
 548  * Return 0 if unchanged, 1 if changed, or negative on error.
 549  *
 550  * Caller should hold map_sem for read and request_mutex.
 551  */
 552 static int __map_osds(struct ceph_osd_client *osdc,
 553                       struct ceph_osd_request *req)
 554 {
 555         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 556         struct ceph_pg pgid;
 557         int o = -1;
 558         int err;
 559
 560         dout("map_osds %p tid %lld\n", req, req->r_tid);
 561         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 562                                       &req->r_file_layout, osdc->osdmap);
 563         if (err)
 564                 return err;
 565         pgid = reqhead->layout.ol_pgid;
 566         req->r_pgid = pgid;
 567
 568         o = ceph_calc_pg_primary(osdc->osdmap, pgid);
 569
 570         if ((req->r_osd && req->r_osd->o_osd == o &&
 571              req->r_sent >= req->r_osd->o_incarnation) ||
 572             (req->r_osd == NULL && o == -1))
 573                 return 0;  /* no change */
 574
 575         dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
 576              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 577              req->r_osd ? req->r_osd->o_osd : -1);
 578
 579         if (req->r_osd) {
 580                 __cancel_request(req);
 581                 list_del_init(&req->r_osd_item);
 582                 req->r_osd = NULL;
 583         }
 584
 585         req->r_osd = __lookup_osd(osdc, o);
 586         if (!req->r_osd && o >= 0) {
 587                 err = -ENOMEM;
 588                 req->r_osd = create_osd(osdc);
 589                 if (!req->r_osd)
 590                         goto out;
 591
 592                 dout("map_osds osd %p is osd%d\n", req->r_osd, o);
 593                 req->r_osd->o_osd = o;
 594                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
 595                 __insert_osd(osdc, req->r_osd);
 596
 597                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
 598         }
 599
 600         if (req->r_osd) {
 601                 __remove_osd_from_lru(req->r_osd);
 602                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 603         }
 604         err = 1;   /* osd changed */
 605
 606 out:
 607         return err;
 608 }
 609
 610 /*
 611  * caller should hold map_sem (for read) and request_mutex
 612  */
 613 static int __send_request(struct ceph_osd_client *osdc,
 614                           struct ceph_osd_request *req)
 615 {
 616         struct ceph_osd_request_head *reqhead;
 617         int err;
 618
 619         err = __map_osds(osdc, req);
 620         if (err < 0)
 621                 return err;
 622         if (req->r_osd == NULL) {
 623                 dout("send_request %p no up osds in pg\n", req);
 624                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 625                 return 0;
 626         }
 627
 628         dout("send_request %p tid %llu to osd%d flags %d\n",
 629              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
 630
 631         reqhead = req->r_request->front.iov_base;
 632         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
 633         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
 634         reqhead->reassert_version = req->r_reassert_version;
 635
 636         req->r_sent_stamp = jiffies;
 637         list_move_tail(&osdc->req_lru, &req->r_req_lru_item);
 638
 639         ceph_msg_get(req->r_request); /* send consumes a ref */
 640         ceph_con_send(&req->r_osd->o_con, req->r_request);
 641         req->r_sent = req->r_osd->o_incarnation;
 642         return 0;
 643 }
 644
 645 /*
 646  * Timeout callback, called every N seconds when 1 or more osd
 647  * requests has been active for more than N seconds.  When this
 648  * happens, we ping all OSDs with requests who have timed out to
 649  * ensure any communications channel reset is detected.  Reset the
 650  * request timeouts another N seconds in the future as we go.
 651  * Reschedule the timeout event another N seconds in future (unless
 652  * there are no open requests).
 653  */
 654 static void handle_timeout(struct work_struct *work)
 655 {
 656         struct ceph_osd_client *osdc =
 657                 container_of(work, struct ceph_osd_client, timeout_work.work);
 658         struct ceph_osd_request *req, *last_req = NULL;
 659         struct ceph_osd *osd;
 660         unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ;
 661         unsigned long keepalive =
 662                 osdc->client->mount_args->osd_keepalive_timeout * HZ;
 663         unsigned long last_sent = 0;
 664         struct rb_node *p;
 665         struct list_head slow_osds;
 666
 667         dout("timeout\n");
 668         down_read(&osdc->map_sem);
 669
 670         ceph_monc_request_next_osdmap(&osdc->client->monc);
 671
 672         mutex_lock(&osdc->request_mutex);
 673         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 674                 req = rb_entry(p, struct ceph_osd_request, r_node);
 675
 676                 if (req->r_resend) {
 677                         int err;
 678
 679                         dout("osdc resending prev failed %lld\n", req->r_tid);
 680                         err = __send_request(osdc, req);
 681                         if (err)
 682                                 dout("osdc failed again on %lld\n", req->r_tid);
 683                         else
 684                                 req->r_resend = false;
 685                         continue;
 686                 }
 687         }
 688
 689         /*
 690          * reset osds that appear to be _really_ unresponsive.  this
 691          * is a failsafe measure.. we really shouldn't be getting to
 692          * this point if the system is working properly.  the monitors
 693          * should mark the osd as failed and we should find out about
 694          * it from an updated osd map.
 695          */
 696         while (!list_empty(&osdc->req_lru)) {
 697                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
 698                                  r_req_lru_item);
 699
 700                 if (time_before(jiffies, req->r_sent_stamp + timeout))
 701                         break;
 702
 703                 BUG_ON(req == last_req && req->r_sent_stamp == last_sent);
 704                 last_req = req;
 705                 last_sent = req->r_sent_stamp;
 706
 707                 osd = req->r_osd;
 708                 BUG_ON(!osd);
 709                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
 710                            req->r_tid, osd->o_osd);
 711                 __kick_requests(osdc, osd);
 712         }
 713
 714         /*
 715          * ping osds that are a bit slow.  this ensures that if there
 716          * is a break in the TCP connection we will notice, and reopen
 717          * a connection with that osd (from the fault callback).
 718          */
 719         INIT_LIST_HEAD(&slow_osds);
 720         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
 721                 if (time_before(jiffies, req->r_sent_stamp + keepalive))
 722                         break;
 723
 724                 osd = req->r_osd;
 725                 BUG_ON(!osd);
 726                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
 727                      req->r_tid, osd->o_osd);
 728                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
 729         }
 730         while (!list_empty(&slow_osds)) {
 731                 osd = list_entry(slow_osds.next, struct ceph_osd,
 732                                  o_keepalive_item);
 733                 list_del_init(&osd->o_keepalive_item);
 734                 ceph_con_keepalive(&osd->o_con);
 735         }
 736
 737         __schedule_osd_timeout(osdc);
 738         mutex_unlock(&osdc->request_mutex);
 739
 740         up_read(&osdc->map_sem);
 741 }
 742
 743 static void handle_osds_timeout(struct work_struct *work)
 744 {
 745         struct ceph_osd_client *osdc =
 746                 container_of(work, struct ceph_osd_client,
 747                              osds_timeout_work.work);
 748         unsigned long delay =
 749                 osdc->client->mount_args->osd_idle_ttl * HZ >> 2;
 750
 751         dout("osds timeout\n");
 752         down_read(&osdc->map_sem);
 753         remove_old_osds(osdc, 0);
 754         up_read(&osdc->map_sem);
 755
 756         schedule_delayed_work(&osdc->osds_timeout_work,
 757                               round_jiffies_relative(delay));
 758 }
 759
 760 /*
 761  * handle osd op reply.  either call the callback if it is specified,
 762  * or do the completion to wake up the waiting thread.
 763  */
 764 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
 765                          struct ceph_connection *con)
 766 {
 767         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
 768         struct ceph_osd_request *req;
 769         u64 tid;
 770         int numops, object_len, flags;
 771
 772         tid = le64_to_cpu(msg->hdr.tid);
 773         if (msg->front.iov_len < sizeof(*rhead))
 774                 goto bad;
 775         numops = le32_to_cpu(rhead->num_ops);
 776         object_len = le32_to_cpu(rhead->object_len);
 777         if (msg->front.iov_len != sizeof(*rhead) + object_len +
 778             numops * sizeof(struct ceph_osd_op))
 779                 goto bad;
 780         dout("handle_reply %p tid %llu\n", msg, tid);
 781
 782         /* lookup */
 783         mutex_lock(&osdc->request_mutex);
 784         req = __lookup_request(osdc, tid);
 785         if (req == NULL) {
 786                 dout("handle_reply tid %llu dne\n", tid);
 787                 mutex_unlock(&osdc->request_mutex);
 788                 return;
 789         }
 790         ceph_osdc_get_request(req);
 791         flags = le32_to_cpu(rhead->flags);
 792
 793         /*
 794          * if this connection filled our message, drop our reference now, to
 795          * avoid a (safe but slower) revoke later.
 796          */
 797         if (req->r_con_filling_msg == con && req->r_reply == msg) {
 798                 dout(" dropping con_filling_msg ref %p\n", con);
 799                 req->r_con_filling_msg = NULL;
 800                 ceph_con_put(con);
 801         }
 802
 803         if (!req->r_got_reply) {
 804                 unsigned bytes;
 805
 806                 req->r_result = le32_to_cpu(rhead->result);
 807                 bytes = le32_to_cpu(msg->hdr.data_len);
 808                 dout("handle_reply result %d bytes %d\n", req->r_result,
 809                      bytes);
 810                 if (req->r_result == 0)
 811                         req->r_result = bytes;
 812
 813                 /* in case this is a write and we need to replay, */
 814                 req->r_reassert_version = rhead->reassert_version;
 815
 816                 req->r_got_reply = 1;
 817         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
 818                 dout("handle_reply tid %llu dup ack\n", tid);
 819                 mutex_unlock(&osdc->request_mutex);
 820                 goto done;
 821         }
 822
 823         dout("handle_reply tid %llu flags %d\n", tid, flags);
 824
 825         /* either this is a read, or we got the safe response */
 826         if ((flags & CEPH_OSD_FLAG_ONDISK) ||
 827             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
 828                 __unregister_request(osdc, req);
 829
 830         mutex_unlock(&osdc->request_mutex);
 831
 832         if (req->r_callback)
 833                 req->r_callback(req, msg);
 834         else
 835                 complete(&req->r_completion);
 836
 837         if (flags & CEPH_OSD_FLAG_ONDISK) {
 838                 if (req->r_safe_callback)
 839                         req->r_safe_callback(req, msg);
 840                 complete(&req->r_safe_completion);  /* fsync waiter */
 841         }
 842
 843 done:
 844         ceph_osdc_put_request(req);
 845         return;
 846
 847 bad:
 848         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
 849                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
 850                (int)sizeof(*rhead));
 851         ceph_msg_dump(msg);
 852 }
 853
 854
 855 static int __kick_requests(struct ceph_osd_client *osdc,
 856                           struct ceph_osd *kickosd)
 857 {
 858         struct ceph_osd_request *req;
 859         struct rb_node *p, *n;
 860         int needmap = 0;
 861         int err;
 862
 863         dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
 864         if (kickosd) {
 865                 __reset_osd(osdc, kickosd);
 866         } else {
 867                 for (p = rb_first(&osdc->osds); p; p = n) {
 868                         struct ceph_osd *osd =
 869                                 rb_entry(p, struct ceph_osd, o_node);
 870
 871                         n = rb_next(p);
 872                         if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
 873                             memcmp(&osd->o_con.peer_addr,
 874                                    ceph_osd_addr(osdc->osdmap,
 875                                                  osd->o_osd),
 876                                    sizeof(struct ceph_entity_addr)) != 0)
 877                                 __reset_osd(osdc, osd);
 878                 }
 879         }
 880
 881         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
 882                 req = rb_entry(p, struct ceph_osd_request, r_node);
 883
 884                 if (req->r_resend) {
 885                         dout(" r_resend set on tid %llu\n", req->r_tid);
 886                         __cancel_request(req);
 887                         goto kick;
 888                 }
 889                 if (req->r_osd && kickosd == req->r_osd) {
 890                         __cancel_request(req);
 891                         goto kick;
 892                 }
 893
 894                 err = __map_osds(osdc, req);
 895                 if (err == 0)
 896                         continue;  /* no change */
 897                 if (err < 0) {
 898                         /*
 899                          * FIXME: really, we should set the request
 900                          * error and fail if this isn't a 'nofail'
 901                          * request, but that's a fair bit more
 902                          * complicated to do.  So retry!
 903                          */
 904                         dout(" setting r_resend on %llu\n", req->r_tid);
 905                         req->r_resend = true;
 906                         continue;
 907                 }
 908                 if (req->r_osd == NULL) {
 909                         dout("tid %llu maps to no valid osd\n", req->r_tid);
 910                         needmap++;  /* request a newer map */
 911                         continue;
 912                 }
 913
 914 kick:
 915                 dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
 916                      req->r_osd->o_osd);
 917                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
 918                 err = __send_request(osdc, req);
 919                 if (err) {
 920                         dout(" setting r_resend on %llu\n", req->r_tid);
 921                         req->r_resend = true;
 922                 }
 923         }
 924
 925         return needmap;
 926 }
 927
 928 /*
 929  * Resubmit osd requests whose osd or osd address has changed.  Request
 930  * a new osd map if osds are down, or we are otherwise unable to determine
 931  * how to direct a request.
 932  *
 933  * Close connections to down osds.
 934  *
 935  * If @who is specified, resubmit requests for that specific osd.
 936  *
 937  * Caller should hold map_sem for read and request_mutex.
 938  */
 939 static void kick_requests(struct ceph_osd_client *osdc,
 940                           struct ceph_osd *kickosd)
 941 {
 942         int needmap;
 943
 944         mutex_lock(&osdc->request_mutex);
 945         needmap = __kick_requests(osdc, kickosd);
 946         mutex_unlock(&osdc->request_mutex);
 947
 948         if (needmap) {
 949                 dout("%d requests for down osds, need new map\n", needmap);
 950                 ceph_monc_request_next_osdmap(&osdc->client->monc);
 951         }
 952
 953 }
 954 /*
 955  * Process updated osd map.
 956  *
 957  * The message contains any number of incremental and full maps, normally
 958  * indicating some sort of topology change in the cluster.  Kick requests
 959  * off to different OSDs as needed.
 960  */
 961 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 962 {
 963         void *p, *end, *next;
 964         u32 nr_maps, maplen;
 965         u32 epoch;
 966         struct ceph_osdmap *newmap = NULL, *oldmap;
 967         int err;
 968         struct ceph_fsid fsid;
 969
 970         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
 971         p = msg->front.iov_base;
 972         end = p + msg->front.iov_len;
 973
 974         /* verify fsid */
 975         ceph_decode_need(&p, end, sizeof(fsid), bad);
 976         ceph_decode_copy(&p, &fsid, sizeof(fsid));
 977         if (ceph_check_fsid(osdc->client, &fsid) < 0)
 978                 return;
 979
 980         down_write(&osdc->map_sem);
 981
 982         /* incremental maps */
 983         ceph_decode_32_safe(&p, end, nr_maps, bad);
 984         dout(" %d inc maps\n", nr_maps);
 985         while (nr_maps > 0) {
 986                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
 987                 epoch = ceph_decode_32(&p);
 988                 maplen = ceph_decode_32(&p);
 989                 ceph_decode_need(&p, end, maplen, bad);
 990                 next = p + maplen;
 991                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
 992                         dout("applying incremental map %u len %d\n",
 993                              epoch, maplen);
 994                         newmap = osdmap_apply_incremental(&p, next,
 995                                                           osdc->osdmap,
 996                                                           osdc->client->msgr);
 997                         if (IS_ERR(newmap)) {
 998                                 err = PTR_ERR(newmap);
 999                                 goto bad;
1000                         }
1001                         BUG_ON(!newmap);
1002                         if (newmap != osdc->osdmap) {
1003                                 ceph_osdmap_destroy(osdc->osdmap);
1004                                 osdc->osdmap = newmap;
1005                         }
1006                 } else {
1007                         dout("ignoring incremental map %u len %d\n",
1008                              epoch, maplen);
1009                 }
1010                 p = next;
1011                 nr_maps--;
1012         }
1013         if (newmap)
1014                 goto done;
1015
1016         /* full maps */
1017         ceph_decode_32_safe(&p, end, nr_maps, bad);
1018         dout(" %d full maps\n", nr_maps);
1019         while (nr_maps) {
1020                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1021                 epoch = ceph_decode_32(&p);
1022                 maplen = ceph_decode_32(&p);
1023                 ceph_decode_need(&p, end, maplen, bad);
1024                 if (nr_maps > 1) {
1025                         dout("skipping non-latest full map %u len %d\n",
1026                              epoch, maplen);
1027                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1028                         dout("skipping full map %u len %d, "
1029                              "older than our %u\n", epoch, maplen,
1030                              osdc->osdmap->epoch);
1031                 } else {
1032                         dout("taking full map %u len %d\n", epoch, maplen);
1033                         newmap = osdmap_decode(&p, p+maplen);
1034                         if (IS_ERR(newmap)) {
1035                                 err = PTR_ERR(newmap);
1036                                 goto bad;
1037                         }
1038                         BUG_ON(!newmap);
1039                         oldmap = osdc->osdmap;
1040                         osdc->osdmap = newmap;
1041                         if (oldmap)
1042                                 ceph_osdmap_destroy(oldmap);
1043                 }
1044                 p += maplen;
1045                 nr_maps--;
1046         }
1047
1048 done:
1049         downgrade_write(&osdc->map_sem);
1050         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1051         if (newmap)
1052                 kick_requests(osdc, NULL);
1053         up_read(&osdc->map_sem);
1054         return;
1055
1056 bad:
1057         pr_err("osdc handle_map corrupt msg\n");
1058         ceph_msg_dump(msg);
1059         up_write(&osdc->map_sem);
1060         return;
1061 }
1062
1063
1064 /*
1065  * A read request prepares specific pages that data is to be read into.
1066  * When a message is being read off the wire, we call prepare_pages to
1067  * find those pages.
1068  *  0 = success, -1 failure.
1069  */
1070 static int __prepare_pages(struct ceph_connection *con,
1071                          struct ceph_msg_header *hdr,
1072                          struct ceph_osd_request *req,
1073                          u64 tid,
1074                          struct ceph_msg *m)
1075 {
1076         struct ceph_osd *osd = con->private;
1077         struct ceph_osd_client *osdc;
1078         int ret = -1;
1079         int data_len = le32_to_cpu(hdr->data_len);
1080         unsigned data_off = le16_to_cpu(hdr->data_off);
1081
1082         int want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
1083
1084         if (!osd)
1085                 return -1;
1086
1087         osdc = osd->o_osdc;
1088
1089         dout("__prepare_pages on msg %p tid %llu, has %d pages, want %d\n", m,
1090              tid, req->r_num_pages, want);
1091         if (unlikely(req->r_num_pages < want))
1092                 goto out;
1093         m->pages = req->r_pages;
1094         m->nr_pages = req->r_num_pages;
1095         ret = 0; /* success */
1096 out:
1097         BUG_ON(ret < 0 || m->nr_pages < want);
1098
1099         return ret;
1100 }
1101
1102 /*
1103  * Register request, send initial attempt.
1104  */
1105 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1106                             struct ceph_osd_request *req,
1107                             bool nofail)
1108 {
1109         int rc = 0;
1110
1111         req->r_request->pages = req->r_pages;
1112         req->r_request->nr_pages = req->r_num_pages;
1113
1114         register_request(osdc, req);
1115
1116         down_read(&osdc->map_sem);
1117         mutex_lock(&osdc->request_mutex);
1118         /*
1119          * a racing kick_requests() may have sent the message for us
1120          * while we dropped request_mutex above, so only send now if
1121          * the request still han't been touched yet.
1122          */
1123         if (req->r_sent == 0) {
1124                 rc = __send_request(osdc, req);
1125                 if (rc) {
1126                         if (nofail) {
1127                                 dout("osdc_start_request failed send, "
1128                                      " marking %lld\n", req->r_tid);
1129                                 req->r_resend = true;
1130                                 rc = 0;
1131                         } else {
1132                                 __unregister_request(osdc, req);
1133                         }
1134                 }
1135         }
1136         mutex_unlock(&osdc->request_mutex);
1137         up_read(&osdc->map_sem);
1138         return rc;
1139 }
1140
1141 /*
1142  * wait for a request to complete
1143  */
1144 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1145                            struct ceph_osd_request *req)
1146 {
1147         int rc;
1148
1149         rc = wait_for_completion_interruptible(&req->r_completion);
1150         if (rc < 0) {
1151                 mutex_lock(&osdc->request_mutex);
1152                 __cancel_request(req);
1153                 __unregister_request(osdc, req);
1154                 mutex_unlock(&osdc->request_mutex);
1155                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1156                 return rc;
1157         }
1158
1159         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1160         return req->r_result;
1161 }
1162
1163 /*
1164  * sync - wait for all in-flight requests to flush.  avoid starvation.
1165  */
1166 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1167 {
1168         struct ceph_osd_request *req;
1169         u64 last_tid, next_tid = 0;
1170
1171         mutex_lock(&osdc->request_mutex);
1172         last_tid = osdc->last_tid;
1173         while (1) {
1174                 req = __lookup_request_ge(osdc, next_tid);
1175                 if (!req)
1176                         break;
1177                 if (req->r_tid > last_tid)
1178                         break;
1179
1180                 next_tid = req->r_tid + 1;
1181                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1182                         continue;
1183
1184                 ceph_osdc_get_request(req);
1185                 mutex_unlock(&osdc->request_mutex);
1186                 dout("sync waiting on tid %llu (last is %llu)\n",
1187                      req->r_tid, last_tid);
1188                 wait_for_completion(&req->r_safe_completion);
1189                 mutex_lock(&osdc->request_mutex);
1190                 ceph_osdc_put_request(req);
1191         }
1192         mutex_unlock(&osdc->request_mutex);
1193         dout("sync done (thru tid %llu)\n", last_tid);
1194 }
1195
1196 /*
1197  * init, shutdown
1198  */
1199 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1200 {
1201         int err;
1202
1203         dout("init\n");
1204         osdc->client = client;
1205         osdc->osdmap = NULL;
1206         init_rwsem(&osdc->map_sem);
1207         init_completion(&osdc->map_waiters);
1208         osdc->last_requested_map = 0;
1209         mutex_init(&osdc->request_mutex);
1210         osdc->last_tid = 0;
1211         osdc->osds = RB_ROOT;
1212         INIT_LIST_HEAD(&osdc->osd_lru);
1213         osdc->requests = RB_ROOT;
1214         INIT_LIST_HEAD(&osdc->req_lru);
1215         osdc->num_requests = 0;
1216         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1217         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1218
1219         schedule_delayed_work(&osdc->osds_timeout_work,
1220            round_jiffies_relative(osdc->client->mount_args->osd_idle_ttl * HZ));
1221
1222         err = -ENOMEM;
1223         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1224                                         sizeof(struct ceph_osd_request));
1225         if (!osdc->req_mempool)
1226                 goto out;
1227
1228         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true);
1229         if (err < 0)
1230                 goto out_mempool;
1231         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1232                                 OSD_OPREPLY_FRONT_LEN, 10, true);
1233         if (err < 0)
1234                 goto out_msgpool;
1235         return 0;
1236
1237 out_msgpool:
1238         ceph_msgpool_destroy(&osdc->msgpool_op);
1239 out_mempool:
1240         mempool_destroy(osdc->req_mempool);
1241 out:
1242         return err;
1243 }
1244
1245 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1246 {
1247         cancel_delayed_work_sync(&osdc->timeout_work);
1248         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1249         if (osdc->osdmap) {
1250                 ceph_osdmap_destroy(osdc->osdmap);
1251                 osdc->osdmap = NULL;
1252         }
1253         remove_old_osds(osdc, 1);
1254         mempool_destroy(osdc->req_mempool);
1255         ceph_msgpool_destroy(&osdc->msgpool_op);
1256         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1257 }
1258
1259 /*
1260  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1261  * *plen.  Return number of bytes read, or error.
1262  */
1263 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1264                         struct ceph_vino vino, struct ceph_file_layout *layout,
1265                         u64 off, u64 *plen,
1266                         u32 truncate_seq, u64 truncate_size,
1267                         struct page **pages, int num_pages)
1268 {
1269         struct ceph_osd_request *req;
1270         int rc = 0;
1271
1272         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1273              vino.snap, off, *plen);
1274         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1275                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1276                                     NULL, 0, truncate_seq, truncate_size, NULL,
1277                                     false, 1);
1278         if (IS_ERR(req))
1279                 return PTR_ERR(req);
1280
1281         /* it may be a short read due to an object boundary */
1282         req->r_pages = pages;
1283         num_pages = calc_pages_for(off, *plen);
1284         req->r_num_pages = num_pages;
1285
1286         dout("readpages  final extent is %llu~%llu (%d pages)\n",
1287              off, *plen, req->r_num_pages);
1288
1289         rc = ceph_osdc_start_request(osdc, req, false);
1290         if (!rc)
1291                 rc = ceph_osdc_wait_request(osdc, req);
1292
1293         ceph_osdc_put_request(req);
1294         dout("readpages result %d\n", rc);
1295         return rc;
1296 }
1297
1298 /*
1299  * do a synchronous write on N pages
1300  */
1301 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1302                          struct ceph_file_layout *layout,
1303                          struct ceph_snap_context *snapc,
1304                          u64 off, u64 len,
1305                          u32 truncate_seq, u64 truncate_size,
1306                          struct timespec *mtime,
1307                          struct page **pages, int num_pages,
1308                          int flags, int do_sync, bool nofail)
1309 {
1310         struct ceph_osd_request *req;
1311         int rc = 0;
1312
1313         BUG_ON(vino.snap != CEPH_NOSNAP);
1314         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1315                                     CEPH_OSD_OP_WRITE,
1316                                     flags | CEPH_OSD_FLAG_ONDISK |
1317                                             CEPH_OSD_FLAG_WRITE,
1318                                     snapc, do_sync,
1319                                     truncate_seq, truncate_size, mtime,
1320                                     nofail, 1);
1321         if (IS_ERR(req))
1322                 return PTR_ERR(req);
1323
1324         /* it may be a short write due to an object boundary */
1325         req->r_pages = pages;
1326         req->r_num_pages = calc_pages_for(off, len);
1327         dout("writepages %llu~%llu (%d pages)\n", off, len,
1328              req->r_num_pages);
1329
1330         rc = ceph_osdc_start_request(osdc, req, nofail);
1331         if (!rc)
1332                 rc = ceph_osdc_wait_request(osdc, req);
1333
1334         ceph_osdc_put_request(req);
1335         if (rc == 0)
1336                 rc = len;
1337         dout("writepages result %d\n", rc);
1338         return rc;
1339 }
1340
1341 /*
1342  * handle incoming message
1343  */
1344 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1345 {
1346         struct ceph_osd *osd = con->private;
1347         struct ceph_osd_client *osdc;
1348         int type = le16_to_cpu(msg->hdr.type);
1349
1350         if (!osd)
1351                 return;
1352         osdc = osd->o_osdc;
1353
1354         switch (type) {
1355         case CEPH_MSG_OSD_MAP:
1356                 ceph_osdc_handle_map(osdc, msg);
1357                 break;
1358         case CEPH_MSG_OSD_OPREPLY:
1359                 handle_reply(osdc, msg, con);
1360                 break;
1361
1362         default:
1363                 pr_err("received unknown message type %d %s\n", type,
1364                        ceph_msg_type_name(type));
1365         }
1366         ceph_msg_put(msg);
1367 }
1368
1369 /*
1370  * lookup and return message for incoming reply
1371  */
1372 static struct ceph_msg *get_reply(struct ceph_connection *con,
1373                                   struct ceph_msg_header *hdr,
1374                                   int *skip)
1375 {
1376         struct ceph_osd *osd = con->private;
1377         struct ceph_osd_client *osdc = osd->o_osdc;
1378         struct ceph_msg *m;
1379         struct ceph_osd_request *req;
1380         int front = le32_to_cpu(hdr->front_len);
1381         int data_len = le32_to_cpu(hdr->data_len);
1382         u64 tid;
1383         int err;
1384
1385         tid = le64_to_cpu(hdr->tid);
1386         mutex_lock(&osdc->request_mutex);
1387         req = __lookup_request(osdc, tid);
1388         if (!req) {
1389                 *skip = 1;
1390                 m = NULL;
1391                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1392                         osd->o_osd);
1393                 goto out;
1394         }
1395
1396         if (req->r_con_filling_msg) {
1397                 dout("get_reply revoking msg %p from old con %p\n",
1398                      req->r_reply, req->r_con_filling_msg);
1399                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
1400                 ceph_con_put(req->r_con_filling_msg);
1401         }
1402
1403         if (front > req->r_reply->front.iov_len) {
1404                 pr_warning("get_reply front %d > preallocated %d\n",
1405                            front, (int)req->r_reply->front.iov_len);
1406                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, 0, 0, NULL);
1407                 if (IS_ERR(m))
1408                         goto out;
1409                 ceph_msg_put(req->r_reply);
1410                 req->r_reply = m;
1411         }
1412         m = ceph_msg_get(req->r_reply);
1413
1414         if (data_len > 0) {
1415                 err = __prepare_pages(con, hdr, req, tid, m);
1416                 if (err < 0) {
1417                         *skip = 1;
1418                         ceph_msg_put(m);
1419                         m = ERR_PTR(err);
1420                 }
1421         }
1422         *skip = 0;
1423         req->r_con_filling_msg = ceph_con_get(con);
1424         dout("get_reply tid %lld %p\n", tid, m);
1425
1426 out:
1427         mutex_unlock(&osdc->request_mutex);
1428         return m;
1429
1430 }
1431
1432 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
1433                                   struct ceph_msg_header *hdr,
1434                                   int *skip)
1435 {
1436         struct ceph_osd *osd = con->private;
1437         int type = le16_to_cpu(hdr->type);
1438         int front = le32_to_cpu(hdr->front_len);
1439
1440         switch (type) {
1441         case CEPH_MSG_OSD_MAP:
1442                 return ceph_msg_new(type, front, 0, 0, NULL);
1443         case CEPH_MSG_OSD_OPREPLY:
1444                 return get_reply(con, hdr, skip);
1445         default:
1446                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
1447                         osd->o_osd);
1448                 *skip = 1;
1449                 return NULL;
1450         }
1451 }
1452
1453 /*
1454  * Wrappers to refcount containing ceph_osd struct
1455  */
1456 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
1457 {
1458         struct ceph_osd *osd = con->private;
1459         if (get_osd(osd))
1460                 return con;
1461         return NULL;
1462 }
1463
1464 static void put_osd_con(struct ceph_connection *con)
1465 {
1466         struct ceph_osd *osd = con->private;
1467         put_osd(osd);
1468 }
1469
1470 /*
1471  * authentication
1472  */
1473 static int get_authorizer(struct ceph_connection *con,
1474                           void **buf, int *len, int *proto,
1475                           void **reply_buf, int *reply_len, int force_new)
1476 {
1477         struct ceph_osd *o = con->private;
1478         struct ceph_osd_client *osdc = o->o_osdc;
1479         struct ceph_auth_client *ac = osdc->client->monc.auth;
1480         int ret = 0;
1481
1482         if (force_new && o->o_authorizer) {
1483                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
1484                 o->o_authorizer = NULL;
1485         }
1486         if (o->o_authorizer == NULL) {
1487                 ret = ac->ops->create_authorizer(
1488                         ac, CEPH_ENTITY_TYPE_OSD,
1489                         &o->o_authorizer,
1490                         &o->o_authorizer_buf,
1491                         &o->o_authorizer_buf_len,
1492                         &o->o_authorizer_reply_buf,
1493                         &o->o_authorizer_reply_buf_len);
1494                 if (ret)
1495                 return ret;
1496         }
1497
1498         *proto = ac->protocol;
1499         *buf = o->o_authorizer_buf;
1500         *len = o->o_authorizer_buf_len;
1501         *reply_buf = o->o_authorizer_reply_buf;
1502         *reply_len = o->o_authorizer_reply_buf_len;
1503         return 0;
1504 }
1505
1506
1507 static int verify_authorizer_reply(struct ceph_connection *con, int len)
1508 {
1509         struct ceph_osd *o = con->private;
1510         struct ceph_osd_client *osdc = o->o_osdc;
1511         struct ceph_auth_client *ac = osdc->client->monc.auth;
1512
1513         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
1514 }
1515
1516 static int invalidate_authorizer(struct ceph_connection *con)
1517 {
1518         struct ceph_osd *o = con->private;
1519         struct ceph_osd_client *osdc = o->o_osdc;
1520         struct ceph_auth_client *ac = osdc->client->monc.auth;
1521
1522         if (ac->ops->invalidate_authorizer)
1523                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
1524
1525         return ceph_monc_validate_auth(&osdc->client->monc);
1526 }
1527
1528 const static struct ceph_connection_operations osd_con_ops = {
1529         .get = get_osd_con,
1530         .put = put_osd_con,
1531         .dispatch = dispatch,
1532         .get_authorizer = get_authorizer,
1533         .verify_authorizer_reply = verify_authorizer_reply,
1534         .invalidate_authorizer = invalidate_authorizer,
1535         .alloc_msg = alloc_msg,
1536         .fault = osd_reset,
1537 };