net/ceph/osd_client.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/err.h>
   5 #include <linux/highmem.h>
   6 #include <linux/mm.h>
   7 #include <linux/pagemap.h>
   8 #include <linux/slab.h>
   9 #include <linux/uaccess.h>
  10 #ifdef CONFIG_BLOCK
  11 #include <linux/bio.h>
  12 #endif
  13
  14 #include <linux/ceph/libceph.h>
  15 #include <linux/ceph/osd_client.h>
  16 #include <linux/ceph/messenger.h>
  17 #include <linux/ceph/decode.h>
  18 #include <linux/ceph/auth.h>
  19 #include <linux/ceph/pagelist.h>
  20
  21 #define OSD_OP_FRONT_LEN        4096
  22 #define OSD_OPREPLY_FRONT_LEN   512
  23
  24 static const struct ceph_connection_operations osd_con_ops;
  25
  26 static void send_queued(struct ceph_osd_client *osdc);
  27 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  28 static void __register_request(struct ceph_osd_client *osdc,
  29                                struct ceph_osd_request *req);
  30 static void __unregister_linger_request(struct ceph_osd_client *osdc,
  31                                         struct ceph_osd_request *req);
  32 static int __send_request(struct ceph_osd_client *osdc,
  33                           struct ceph_osd_request *req);
  34
  35 static int op_needs_trail(int op)
  36 {
  37         switch (op) {
  38         case CEPH_OSD_OP_GETXATTR:
  39         case CEPH_OSD_OP_SETXATTR:
  40         case CEPH_OSD_OP_CMPXATTR:
  41         case CEPH_OSD_OP_CALL:
  42         case CEPH_OSD_OP_NOTIFY:
  43                 return 1;
  44         default:
  45                 return 0;
  46         }
  47 }
  48
  49 static int op_has_extent(int op)
  50 {
  51         return (op == CEPH_OSD_OP_READ ||
  52                 op == CEPH_OSD_OP_WRITE);
  53 }
  54
  55 void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
  56                         struct ceph_file_layout *layout,
  57                         u64 snapid,
  58                         u64 off, u64 *plen, u64 *bno,
  59                         struct ceph_osd_request *req,
  60                         struct ceph_osd_req_op *op)
  61 {
  62         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
  63         u64 orig_len = *plen;
  64         u64 objoff, objlen;    /* extent in object */
  65
  66         reqhead->snapid = cpu_to_le64(snapid);
  67
  68         /* object extent? */
  69         ceph_calc_file_object_mapping(layout, off, plen, bno,
  70                                       &objoff, &objlen);
  71         if (*plen < orig_len)
  72                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  73                      orig_len - *plen, off, *plen);
  74
  75         if (op_has_extent(op->op)) {
  76                 op->extent.offset = objoff;
  77                 op->extent.length = objlen;
  78         }
  79         req->r_num_pages = calc_pages_for(off, *plen);
  80         req->r_page_alignment = off & ~PAGE_MASK;
  81         if (op->op == CEPH_OSD_OP_WRITE)
  82                 op->payload_len = *plen;
  83
  84         dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
  85              *bno, objoff, objlen, req->r_num_pages);
  86
  87 }
  88 EXPORT_SYMBOL(ceph_calc_raw_layout);
  89
  90 /*
  91  * Implement client access to distributed object storage cluster.
  92  *
  93  * All data objects are stored within a cluster/cloud of OSDs, or
  94  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  95  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  96  * remote daemons serving up and coordinating consistent and safe
  97  * access to storage.
  98  *
  99  * Cluster membership and the mapping of data objects onto storage devices
 100  * are described by the osd map.
 101  *
 102  * We keep track of pending OSD requests (read, write), resubmit
 103  * requests to different OSDs when the cluster topology/data layout
 104  * change, or retry the affected requests when the communications
 105  * channel with an OSD is reset.
 106  */
 107
 108 /*
 109  * calculate the mapping of a file extent onto an object, and fill out the
 110  * request accordingly.  shorten extent as necessary if it crosses an
 111  * object boundary.
 112  *
 113  * fill osd op in request message.
 114  */
 115 static void calc_layout(struct ceph_osd_client *osdc,
 116                         struct ceph_vino vino,
 117                         struct ceph_file_layout *layout,
 118                         u64 off, u64 *plen,
 119                         struct ceph_osd_request *req,
 120                         struct ceph_osd_req_op *op)
 121 {
 122         u64 bno;
 123
 124         ceph_calc_raw_layout(osdc, layout, vino.snap, off,
 125                              plen, &bno, req, op);
 126
 127         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
 128         req->r_oid_len = strlen(req->r_oid);
 129 }
 130
 131 /*
 132  * requests
 133  */
 134 void ceph_osdc_release_request(struct kref *kref)
 135 {
 136         struct ceph_osd_request *req = container_of(kref,
 137                                                     struct ceph_osd_request,
 138                                                     r_kref);
 139
 140         if (req->r_request)
 141                 ceph_msg_put(req->r_request);
 142         if (req->r_reply)
 143                 ceph_msg_put(req->r_reply);
 144         if (req->r_con_filling_msg) {
 145                 dout("release_request revoking pages %p from con %p\n",
 146                      req->r_pages, req->r_con_filling_msg);
 147                 ceph_con_revoke_message(req->r_con_filling_msg,
 148                                       req->r_reply);
 149                 ceph_con_put(req->r_con_filling_msg);
 150         }
 151         if (req->r_own_pages)
 152                 ceph_release_page_vector(req->r_pages,
 153                                          req->r_num_pages);
 154 #ifdef CONFIG_BLOCK
 155         if (req->r_bio)
 156                 bio_put(req->r_bio);
 157 #endif
 158         ceph_put_snap_context(req->r_snapc);
 159         if (req->r_trail) {
 160                 ceph_pagelist_release(req->r_trail);
 161                 kfree(req->r_trail);
 162         }
 163         if (req->r_mempool)
 164                 mempool_free(req, req->r_osdc->req_mempool);
 165         else
 166                 kfree(req);
 167 }
 168 EXPORT_SYMBOL(ceph_osdc_release_request);
 169
 170 static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
 171 {
 172         int i = 0;
 173
 174         if (needs_trail)
 175                 *needs_trail = 0;
 176         while (ops[i].op) {
 177                 if (needs_trail && op_needs_trail(ops[i].op))
 178                         *needs_trail = 1;
 179                 i++;
 180         }
 181
 182         return i;
 183 }
 184
 185 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 186                                                int flags,
 187                                                struct ceph_snap_context *snapc,
 188                                                struct ceph_osd_req_op *ops,
 189                                                bool use_mempool,
 190                                                gfp_t gfp_flags,
 191                                                struct page **pages,
 192                                                struct bio *bio)
 193 {
 194         struct ceph_osd_request *req;
 195         struct ceph_msg *msg;
 196         int needs_trail;
 197         int num_op = get_num_ops(ops, &needs_trail);
 198         size_t msg_size = sizeof(struct ceph_osd_request_head);
 199
 200         msg_size += num_op*sizeof(struct ceph_osd_op);
 201
 202         if (use_mempool) {
 203                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 204                 memset(req, 0, sizeof(*req));
 205         } else {
 206                 req = kzalloc(sizeof(*req), gfp_flags);
 207         }
 208         if (req == NULL)
 209                 return NULL;
 210
 211         req->r_osdc = osdc;
 212         req->r_mempool = use_mempool;
 213
 214         kref_init(&req->r_kref);
 215         init_completion(&req->r_completion);
 216         init_completion(&req->r_safe_completion);
 217         INIT_LIST_HEAD(&req->r_unsafe_item);
 218         INIT_LIST_HEAD(&req->r_linger_item);
 219         INIT_LIST_HEAD(&req->r_linger_osd);
 220         req->r_flags = flags;
 221
 222         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
 223
 224         /* create reply message */
 225         if (use_mempool)
 226                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 227         else
 228                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 229                                    OSD_OPREPLY_FRONT_LEN, gfp_flags);
 230         if (!msg) {
 231                 ceph_osdc_put_request(req);
 232                 return NULL;
 233         }
 234         req->r_reply = msg;
 235
 236         /* allocate space for the trailing data */
 237         if (needs_trail) {
 238                 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
 239                 if (!req->r_trail) {
 240                         ceph_osdc_put_request(req);
 241                         return NULL;
 242                 }
 243                 ceph_pagelist_init(req->r_trail);
 244         }
 245         /* create request message; allow space for oid */
 246         msg_size += 40;
 247         if (snapc)
 248                 msg_size += sizeof(u64) * snapc->num_snaps;
 249         if (use_mempool)
 250                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 251         else
 252                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags);
 253         if (!msg) {
 254                 ceph_osdc_put_request(req);
 255                 return NULL;
 256         }
 257
 258         msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
 259         memset(msg->front.iov_base, 0, msg->front.iov_len);
 260
 261         req->r_request = msg;
 262         req->r_pages = pages;
 263 #ifdef CONFIG_BLOCK
 264         if (bio) {
 265                 req->r_bio = bio;
 266                 bio_get(req->r_bio);
 267         }
 268 #endif
 269
 270         return req;
 271 }
 272 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 273
 274 static void osd_req_encode_op(struct ceph_osd_request *req,
 275                               struct ceph_osd_op *dst,
 276                               struct ceph_osd_req_op *src)
 277 {
 278         dst->op = cpu_to_le16(src->op);
 279
 280         switch (dst->op) {
 281         case CEPH_OSD_OP_READ:
 282         case CEPH_OSD_OP_WRITE:
 283                 dst->extent.offset =
 284                         cpu_to_le64(src->extent.offset);
 285                 dst->extent.length =
 286                         cpu_to_le64(src->extent.length);
 287                 dst->extent.truncate_size =
 288                         cpu_to_le64(src->extent.truncate_size);
 289                 dst->extent.truncate_seq =
 290                         cpu_to_le32(src->extent.truncate_seq);
 291                 break;
 292
 293         case CEPH_OSD_OP_GETXATTR:
 294         case CEPH_OSD_OP_SETXATTR:
 295         case CEPH_OSD_OP_CMPXATTR:
 296                 BUG_ON(!req->r_trail);
 297
 298                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 299                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 300                 dst->xattr.cmp_op = src->xattr.cmp_op;
 301                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
 302                 ceph_pagelist_append(req->r_trail, src->xattr.name,
 303                                      src->xattr.name_len);
 304                 ceph_pagelist_append(req->r_trail, src->xattr.val,
 305                                      src->xattr.value_len);
 306                 break;
 307         case CEPH_OSD_OP_CALL:
 308                 BUG_ON(!req->r_trail);
 309
 310                 dst->cls.class_len = src->cls.class_len;
 311                 dst->cls.method_len = src->cls.method_len;
 312                 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
 313
 314                 ceph_pagelist_append(req->r_trail, src->cls.class_name,
 315                                      src->cls.class_len);
 316                 ceph_pagelist_append(req->r_trail, src->cls.method_name,
 317                                      src->cls.method_len);
 318                 ceph_pagelist_append(req->r_trail, src->cls.indata,
 319                                      src->cls.indata_len);
 320                 break;
 321         case CEPH_OSD_OP_ROLLBACK:
 322                 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
 323                 break;
 324         case CEPH_OSD_OP_STARTSYNC:
 325                 break;
 326         case CEPH_OSD_OP_NOTIFY:
 327                 {
 328                         __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
 329                         __le32 timeout = cpu_to_le32(src->watch.timeout);
 330
 331                         BUG_ON(!req->r_trail);
 332
 333                         ceph_pagelist_append(req->r_trail,
 334                                                 &prot_ver, sizeof(prot_ver));
 335                         ceph_pagelist_append(req->r_trail,
 336                                                 &timeout, sizeof(timeout));
 337                 }
 338         case CEPH_OSD_OP_NOTIFY_ACK:
 339         case CEPH_OSD_OP_WATCH:
 340                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 341                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 342                 dst->watch.flag = src->watch.flag;
 343                 break;
 344         default:
 345                 pr_err("unrecognized osd opcode %d\n", dst->op);
 346                 WARN_ON(1);
 347                 break;
 348         }
 349         dst->payload_len = cpu_to_le32(src->payload_len);
 350 }
 351
 352 /*
 353  * build new request AND message
 354  *
 355  */
 356 void ceph_osdc_build_request(struct ceph_osd_request *req,
 357                              u64 off, u64 *plen,
 358                              struct ceph_osd_req_op *src_ops,
 359                              struct ceph_snap_context *snapc,
 360                              struct timespec *mtime,
 361                              const char *oid,
 362                              int oid_len)
 363 {
 364         struct ceph_msg *msg = req->r_request;
 365         struct ceph_osd_request_head *head;
 366         struct ceph_osd_req_op *src_op;
 367         struct ceph_osd_op *op;
 368         void *p;
 369         int num_op = get_num_ops(src_ops, NULL);
 370         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 371         int flags = req->r_flags;
 372         u64 data_len = 0;
 373         int i;
 374
 375         head = msg->front.iov_base;
 376         op = (void *)(head + 1);
 377         p = (void *)(op + num_op);
 378
 379         req->r_snapc = ceph_get_snap_context(snapc);
 380
 381         head->client_inc = cpu_to_le32(1); /* always, for now. */
 382         head->flags = cpu_to_le32(flags);
 383         if (flags & CEPH_OSD_FLAG_WRITE)
 384                 ceph_encode_timespec(&head->mtime, mtime);
 385         head->num_ops = cpu_to_le16(num_op);
 386
 387
 388         /* fill in oid */
 389         head->object_len = cpu_to_le32(oid_len);
 390         memcpy(p, oid, oid_len);
 391         p += oid_len;
 392
 393         src_op = src_ops;
 394         while (src_op->op) {
 395                 osd_req_encode_op(req, op, src_op);
 396                 src_op++;
 397                 op++;
 398         }
 399
 400         if (req->r_trail)
 401                 data_len += req->r_trail->length;
 402
 403         if (snapc) {
 404                 head->snap_seq = cpu_to_le64(snapc->seq);
 405                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
 406                 for (i = 0; i < snapc->num_snaps; i++) {
 407                         put_unaligned_le64(snapc->snaps[i], p);
 408                         p += sizeof(u64);
 409                 }
 410         }
 411
 412         if (flags & CEPH_OSD_FLAG_WRITE) {
 413                 req->r_request->hdr.data_off = cpu_to_le16(off);
 414                 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
 415         } else if (data_len) {
 416                 req->r_request->hdr.data_off = 0;
 417                 req->r_request->hdr.data_len = cpu_to_le32(data_len);
 418         }
 419
 420         req->r_request->page_alignment = req->r_page_alignment;
 421
 422         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
 423         msg_size = p - msg->front.iov_base;
 424         msg->front.iov_len = msg_size;
 425         msg->hdr.front_len = cpu_to_le32(msg_size);
 426         return;
 427 }
 428 EXPORT_SYMBOL(ceph_osdc_build_request);
 429
 430 /*
 431  * build new request AND message, calculate layout, and adjust file
 432  * extent as needed.
 433  *
 434  * if the file was recently truncated, we include information about its
 435  * old and new size so that the object can be updated appropriately.  (we
 436  * avoid synchronously deleting truncated objects because it's slow.)
 437  *
 438  * if @do_sync, include a 'startsync' command so that the osd will flush
 439  * data quickly.
 440  */
 441 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 442                                                struct ceph_file_layout *layout,
 443                                                struct ceph_vino vino,
 444                                                u64 off, u64 *plen,
 445                                                int opcode, int flags,
 446                                                struct ceph_snap_context *snapc,
 447                                                int do_sync,
 448                                                u32 truncate_seq,
 449                                                u64 truncate_size,
 450                                                struct timespec *mtime,
 451                                                bool use_mempool, int num_reply,
 452                                                int page_align)
 453 {
 454         struct ceph_osd_req_op ops[3];
 455         struct ceph_osd_request *req;
 456
 457         ops[0].op = opcode;
 458         ops[0].extent.truncate_seq = truncate_seq;
 459         ops[0].extent.truncate_size = truncate_size;
 460         ops[0].payload_len = 0;
 461
 462         if (do_sync) {
 463                 ops[1].op = CEPH_OSD_OP_STARTSYNC;
 464                 ops[1].payload_len = 0;
 465                 ops[2].op = 0;
 466         } else
 467                 ops[1].op = 0;
 468
 469         req = ceph_osdc_alloc_request(osdc, flags,
 470                                          snapc, ops,
 471                                          use_mempool,
 472                                          GFP_NOFS, NULL, NULL);
 473         if (!req)
 474                 return NULL;
 475
 476         /* calculate max write size */
 477         calc_layout(osdc, vino, layout, off, plen, req, ops);
 478         req->r_file_layout = *layout;  /* keep a copy */
 479
 480         /* in case it differs from natural (file) alignment that
 481            calc_layout filled in for us */
 482         req->r_num_pages = calc_pages_for(page_align, *plen);
 483         req->r_page_alignment = page_align;
 484
 485         ceph_osdc_build_request(req, off, plen, ops,
 486                                 snapc,
 487                                 mtime,
 488                                 req->r_oid, req->r_oid_len);
 489
 490         return req;
 491 }
 492 EXPORT_SYMBOL(ceph_osdc_new_request);
 493
 494 /*
 495  * We keep osd requests in an rbtree, sorted by ->r_tid.
 496  */
 497 static void __insert_request(struct ceph_osd_client *osdc,
 498                              struct ceph_osd_request *new)
 499 {
 500         struct rb_node **p = &osdc->requests.rb_node;
 501         struct rb_node *parent = NULL;
 502         struct ceph_osd_request *req = NULL;
 503
 504         while (*p) {
 505                 parent = *p;
 506                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 507                 if (new->r_tid < req->r_tid)
 508                         p = &(*p)->rb_left;
 509                 else if (new->r_tid > req->r_tid)
 510                         p = &(*p)->rb_right;
 511                 else
 512                         BUG();
 513         }
 514
 515         rb_link_node(&new->r_node, parent, p);
 516         rb_insert_color(&new->r_node, &osdc->requests);
 517 }
 518
 519 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 520                                                  u64 tid)
 521 {
 522         struct ceph_osd_request *req;
 523         struct rb_node *n = osdc->requests.rb_node;
 524
 525         while (n) {
 526                 req = rb_entry(n, struct ceph_osd_request, r_node);
 527                 if (tid < req->r_tid)
 528                         n = n->rb_left;
 529                 else if (tid > req->r_tid)
 530                         n = n->rb_right;
 531                 else
 532                         return req;
 533         }
 534         return NULL;
 535 }
 536
 537 static struct ceph_osd_request *
 538 __lookup_request_ge(struct ceph_osd_client *osdc,
 539                     u64 tid)
 540 {
 541         struct ceph_osd_request *req;
 542         struct rb_node *n = osdc->requests.rb_node;
 543
 544         while (n) {
 545                 req = rb_entry(n, struct ceph_osd_request, r_node);
 546                 if (tid < req->r_tid) {
 547                         if (!n->rb_left)
 548                                 return req;
 549                         n = n->rb_left;
 550                 } else if (tid > req->r_tid) {
 551                         n = n->rb_right;
 552                 } else {
 553                         return req;
 554                 }
 555         }
 556         return NULL;
 557 }
 558
 559 /*
 560  * Resubmit requests pending on the given osd.
 561  */
 562 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 563                                 struct ceph_osd *osd)
 564 {
 565         struct ceph_osd_request *req, *nreq;
 566         int err;
 567
 568         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 569         err = __reset_osd(osdc, osd);
 570         if (err == -EAGAIN)
 571                 return;
 572
 573         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 574                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 575                 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
 576                      osd->o_osd);
 577                 if (!req->r_linger)
 578                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 579         }
 580
 581         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 582                                  r_linger_osd) {
 583                 /*
 584                  * reregister request prior to unregistering linger so
 585                  * that r_osd is preserved.
 586                  */
 587                 BUG_ON(!list_empty(&req->r_req_lru_item));
 588                 __register_request(osdc, req);
 589                 list_add(&req->r_req_lru_item, &osdc->req_unsent);
 590                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 591                 __unregister_linger_request(osdc, req);
 592                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 593                      osd->o_osd);
 594         }
 595 }
 596
 597 static void kick_osd_requests(struct ceph_osd_client *osdc,
 598                               struct ceph_osd *kickosd)
 599 {
 600         mutex_lock(&osdc->request_mutex);
 601         __kick_osd_requests(osdc, kickosd);
 602         mutex_unlock(&osdc->request_mutex);
 603 }
 604
 605 /*
 606  * If the osd connection drops, we need to resubmit all requests.
 607  */
 608 static void osd_reset(struct ceph_connection *con)
 609 {
 610         struct ceph_osd *osd = con->private;
 611         struct ceph_osd_client *osdc;
 612
 613         if (!osd)
 614                 return;
 615         dout("osd_reset osd%d\n", osd->o_osd);
 616         osdc = osd->o_osdc;
 617         down_read(&osdc->map_sem);
 618         kick_osd_requests(osdc, osd);
 619         send_queued(osdc);
 620         up_read(&osdc->map_sem);
 621 }
 622
 623 /*
 624  * Track open sessions with osds.
 625  */
 626 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
 627 {
 628         struct ceph_osd *osd;
 629
 630         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 631         if (!osd)
 632                 return NULL;
 633
 634         atomic_set(&osd->o_ref, 1);
 635         osd->o_osdc = osdc;
 636         INIT_LIST_HEAD(&osd->o_requests);
 637         INIT_LIST_HEAD(&osd->o_linger_requests);
 638         INIT_LIST_HEAD(&osd->o_osd_lru);
 639         osd->o_incarnation = 1;
 640
 641         ceph_con_init(osdc->client->msgr, &osd->o_con);
 642         osd->o_con.private = osd;
 643         osd->o_con.ops = &osd_con_ops;
 644         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
 645
 646         INIT_LIST_HEAD(&osd->o_keepalive_item);
 647         return osd;
 648 }
 649
 650 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 651 {
 652         if (atomic_inc_not_zero(&osd->o_ref)) {
 653                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 654                      atomic_read(&osd->o_ref));
 655                 return osd;
 656         } else {
 657                 dout("get_osd %p FAIL\n", osd);
 658                 return NULL;
 659         }
 660 }
 661
 662 static void put_osd(struct ceph_osd *osd)
 663 {
 664         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 665              atomic_read(&osd->o_ref) - 1);
 666         if (atomic_dec_and_test(&osd->o_ref)) {
 667                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 668
 669                 if (osd->o_authorizer)
 670                         ac->ops->destroy_authorizer(ac, osd->o_authorizer);
 671                 kfree(osd);
 672         }
 673 }
 674
 675 /*
 676  * remove an osd from our map
 677  */
 678 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 679 {
 680         dout("__remove_osd %p\n", osd);
 681         BUG_ON(!list_empty(&osd->o_requests));
 682         rb_erase(&osd->o_node, &osdc->osds);
 683         list_del_init(&osd->o_osd_lru);
 684         ceph_con_close(&osd->o_con);
 685         put_osd(osd);
 686 }
 687
 688 static void remove_all_osds(struct ceph_osd_client *osdc)
 689 {
 690         dout("__remove_old_osds %p\n", osdc);
 691         mutex_lock(&osdc->request_mutex);
 692         while (!RB_EMPTY_ROOT(&osdc->osds)) {
 693                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
 694                                                 struct ceph_osd, o_node);
 695                 __remove_osd(osdc, osd);
 696         }
 697         mutex_unlock(&osdc->request_mutex);
 698 }
 699
 700 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 701                               struct ceph_osd *osd)
 702 {
 703         dout("__move_osd_to_lru %p\n", osd);
 704         BUG_ON(!list_empty(&osd->o_osd_lru));
 705         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 706         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
 707 }
 708
 709 static void __remove_osd_from_lru(struct ceph_osd *osd)
 710 {
 711         dout("__remove_osd_from_lru %p\n", osd);
 712         if (!list_empty(&osd->o_osd_lru))
 713                 list_del_init(&osd->o_osd_lru);
 714 }
 715
 716 static void remove_old_osds(struct ceph_osd_client *osdc)
 717 {
 718         struct ceph_osd *osd, *nosd;
 719
 720         dout("__remove_old_osds %p\n", osdc);
 721         mutex_lock(&osdc->request_mutex);
 722         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 723                 if (time_before(jiffies, osd->lru_ttl))
 724                         break;
 725                 __remove_osd(osdc, osd);
 726         }
 727         mutex_unlock(&osdc->request_mutex);
 728 }
 729
 730 /*
 731  * reset osd connect
 732  */
 733 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 734 {
 735         struct ceph_osd_request *req;
 736         int ret = 0;
 737
 738         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 739         if (list_empty(&osd->o_requests) &&
 740             list_empty(&osd->o_linger_requests)) {
 741                 __remove_osd(osdc, osd);
 742         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
 743                           &osd->o_con.peer_addr,
 744                           sizeof(osd->o_con.peer_addr)) == 0 &&
 745                    !ceph_con_opened(&osd->o_con)) {
 746                 dout(" osd addr hasn't changed and connection never opened,"
 747                      " letting msgr retry");
 748                 /* touch each r_stamp for handle_timeout()'s benfit */
 749                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
 750                         req->r_stamp = jiffies;
 751                 ret = -EAGAIN;
 752         } else {
 753                 ceph_con_close(&osd->o_con);
 754                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
 755                 osd->o_incarnation++;
 756         }
 757         return ret;
 758 }
 759
 760 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 761 {
 762         struct rb_node **p = &osdc->osds.rb_node;
 763         struct rb_node *parent = NULL;
 764         struct ceph_osd *osd = NULL;
 765
 766         dout("__insert_osd %p osd%d\n", new, new->o_osd);
 767         while (*p) {
 768                 parent = *p;
 769                 osd = rb_entry(parent, struct ceph_osd, o_node);
 770                 if (new->o_osd < osd->o_osd)
 771                         p = &(*p)->rb_left;
 772                 else if (new->o_osd > osd->o_osd)
 773                         p = &(*p)->rb_right;
 774                 else
 775                         BUG();
 776         }
 777
 778         rb_link_node(&new->o_node, parent, p);
 779         rb_insert_color(&new->o_node, &osdc->osds);
 780 }
 781
 782 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 783 {
 784         struct ceph_osd *osd;
 785         struct rb_node *n = osdc->osds.rb_node;
 786
 787         while (n) {
 788                 osd = rb_entry(n, struct ceph_osd, o_node);
 789                 if (o < osd->o_osd)
 790                         n = n->rb_left;
 791                 else if (o > osd->o_osd)
 792                         n = n->rb_right;
 793                 else
 794                         return osd;
 795         }
 796         return NULL;
 797 }
 798
 799 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
 800 {
 801         schedule_delayed_work(&osdc->timeout_work,
 802                         osdc->client->options->osd_keepalive_timeout * HZ);
 803 }
 804
 805 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
 806 {
 807         cancel_delayed_work(&osdc->timeout_work);
 808 }
 809
 810 /*
 811  * Register request, assign tid.  If this is the first request, set up
 812  * the timeout event.
 813  */
 814 static void __register_request(struct ceph_osd_client *osdc,
 815                                struct ceph_osd_request *req)
 816 {
 817         req->r_tid = ++osdc->last_tid;
 818         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 819         INIT_LIST_HEAD(&req->r_req_lru_item);
 820
 821         dout("__register_request %p tid %lld\n", req, req->r_tid);
 822         __insert_request(osdc, req);
 823         ceph_osdc_get_request(req);
 824         osdc->num_requests++;
 825
 826         if (osdc->num_requests == 1) {
 827                 dout(" first request, scheduling timeout\n");
 828                 __schedule_osd_timeout(osdc);
 829         }
 830 }
 831
 832 static void register_request(struct ceph_osd_client *osdc,
 833                              struct ceph_osd_request *req)
 834 {
 835         mutex_lock(&osdc->request_mutex);
 836         __register_request(osdc, req);
 837         mutex_unlock(&osdc->request_mutex);
 838 }
 839
 840 /*
 841  * called under osdc->request_mutex
 842  */
 843 static void __unregister_request(struct ceph_osd_client *osdc,
 844                                  struct ceph_osd_request *req)
 845 {
 846         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 847         rb_erase(&req->r_node, &osdc->requests);
 848         osdc->num_requests--;
 849
 850         if (req->r_osd) {
 851                 /* make sure the original request isn't in flight. */
 852                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 853
 854                 list_del_init(&req->r_osd_item);
 855                 if (list_empty(&req->r_osd->o_requests) &&
 856                     list_empty(&req->r_osd->o_linger_requests)) {
 857                         dout("moving osd to %p lru\n", req->r_osd);
 858                         __move_osd_to_lru(osdc, req->r_osd);
 859                 }
 860                 if (list_empty(&req->r_linger_item))
 861                         req->r_osd = NULL;
 862         }
 863
 864         ceph_osdc_put_request(req);
 865
 866         list_del_init(&req->r_req_lru_item);
 867         if (osdc->num_requests == 0) {
 868                 dout(" no requests, canceling timeout\n");
 869                 __cancel_osd_timeout(osdc);
 870         }
 871 }
 872
 873 /*
 874  * Cancel a previously queued request message
 875  */
 876 static void __cancel_request(struct ceph_osd_request *req)
 877 {
 878         if (req->r_sent && req->r_osd) {
 879                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 880                 req->r_sent = 0;
 881         }
 882 }
 883
 884 static void __register_linger_request(struct ceph_osd_client *osdc,
 885                                     struct ceph_osd_request *req)
 886 {
 887         dout("__register_linger_request %p\n", req);
 888         list_add_tail(&req->r_linger_item, &osdc->req_linger);
 889         list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
 890 }
 891
 892 static void __unregister_linger_request(struct ceph_osd_client *osdc,
 893                                         struct ceph_osd_request *req)
 894 {
 895         dout("__unregister_linger_request %p\n", req);
 896         if (req->r_osd) {
 897                 list_del_init(&req->r_linger_item);
 898                 list_del_init(&req->r_linger_osd);
 899
 900                 if (list_empty(&req->r_osd->o_requests) &&
 901                     list_empty(&req->r_osd->o_linger_requests)) {
 902                         dout("moving osd to %p lru\n", req->r_osd);
 903                         __move_osd_to_lru(osdc, req->r_osd);
 904                 }
 905                 if (list_empty(&req->r_osd_item))
 906                         req->r_osd = NULL;
 907         }
 908 }
 909
 910 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
 911                                          struct ceph_osd_request *req)
 912 {
 913         mutex_lock(&osdc->request_mutex);
 914         if (req->r_linger) {
 915                 __unregister_linger_request(osdc, req);
 916                 ceph_osdc_put_request(req);
 917         }
 918         mutex_unlock(&osdc->request_mutex);
 919 }
 920 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
 921
 922 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 923                                   struct ceph_osd_request *req)
 924 {
 925         if (!req->r_linger) {
 926                 dout("set_request_linger %p\n", req);
 927                 req->r_linger = 1;
 928                 /*
 929                  * caller is now responsible for calling
 930                  * unregister_linger_request
 931                  */
 932                 ceph_osdc_get_request(req);
 933         }
 934 }
 935 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
 936
 937 /*
 938  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 939  * (as needed), and set the request r_osd appropriately.  If there is
 940  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
 941  * (unsent, homeless) or leave on in-flight lru.
 942  *
 943  * Return 0 if unchanged, 1 if changed, or negative on error.
 944  *
 945  * Caller should hold map_sem for read and request_mutex.
 946  */
 947 static int __map_request(struct ceph_osd_client *osdc,
 948                          struct ceph_osd_request *req)
 949 {
 950         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 951         struct ceph_pg pgid;
 952         int acting[CEPH_PG_MAX_SIZE];
 953         int o = -1, num = 0;
 954         int err;
 955
 956         dout("map_request %p tid %lld\n", req, req->r_tid);
 957         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 958                                       &req->r_file_layout, osdc->osdmap);
 959         if (err) {
 960                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
 961                 return err;
 962         }
 963         pgid = reqhead->layout.ol_pgid;
 964         req->r_pgid = pgid;
 965
 966         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
 967         if (err > 0) {
 968                 o = acting[0];
 969                 num = err;
 970         }
 971
 972         if ((req->r_osd && req->r_osd->o_osd == o &&
 973              req->r_sent >= req->r_osd->o_incarnation &&
 974              req->r_num_pg_osds == num &&
 975              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
 976             (req->r_osd == NULL && o == -1))
 977                 return 0;  /* no change */
 978
 979         dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
 980              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 981              req->r_osd ? req->r_osd->o_osd : -1);
 982
 983         /* record full pg acting set */
 984         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
 985         req->r_num_pg_osds = num;
 986
 987         if (req->r_osd) {
 988                 __cancel_request(req);
 989                 list_del_init(&req->r_osd_item);
 990                 req->r_osd = NULL;
 991         }
 992
 993         req->r_osd = __lookup_osd(osdc, o);
 994         if (!req->r_osd && o >= 0) {
 995                 err = -ENOMEM;
 996                 req->r_osd = create_osd(osdc);
 997                 if (!req->r_osd) {
 998                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
 999                         goto out;
1000                 }
1001
1002                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1003                 req->r_osd->o_osd = o;
1004                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
1005                 __insert_osd(osdc, req->r_osd);
1006
1007                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
1008         }
1009
1010         if (req->r_osd) {
1011                 __remove_osd_from_lru(req->r_osd);
1012                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1013                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1014         } else {
1015                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1016         }
1017         err = 1;   /* osd or pg changed */
1018
1019 out:
1020         return err;
1021 }
1022
1023 /*
1024  * caller should hold map_sem (for read) and request_mutex
1025  */
1026 static int __send_request(struct ceph_osd_client *osdc,
1027                           struct ceph_osd_request *req)
1028 {
1029         struct ceph_osd_request_head *reqhead;
1030
1031         dout("send_request %p tid %llu to osd%d flags %d\n",
1032              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1033
1034         reqhead = req->r_request->front.iov_base;
1035         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1036         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
1037         reqhead->reassert_version = req->r_reassert_version;
1038
1039         req->r_stamp = jiffies;
1040         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1041
1042         ceph_msg_get(req->r_request); /* send consumes a ref */
1043         ceph_con_send(&req->r_osd->o_con, req->r_request);
1044         req->r_sent = req->r_osd->o_incarnation;
1045         return 0;
1046 }
1047
1048 /*
1049  * Send any requests in the queue (req_unsent).
1050  */
1051 static void send_queued(struct ceph_osd_client *osdc)
1052 {
1053         struct ceph_osd_request *req, *tmp;
1054
1055         dout("send_queued\n");
1056         mutex_lock(&osdc->request_mutex);
1057         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1058                 __send_request(osdc, req);
1059         }
1060         mutex_unlock(&osdc->request_mutex);
1061 }
1062
1063 /*
1064  * Timeout callback, called every N seconds when 1 or more osd
1065  * requests has been active for more than N seconds.  When this
1066  * happens, we ping all OSDs with requests who have timed out to
1067  * ensure any communications channel reset is detected.  Reset the
1068  * request timeouts another N seconds in the future as we go.
1069  * Reschedule the timeout event another N seconds in future (unless
1070  * there are no open requests).
1071  */
1072 static void handle_timeout(struct work_struct *work)
1073 {
1074         struct ceph_osd_client *osdc =
1075                 container_of(work, struct ceph_osd_client, timeout_work.work);
1076         struct ceph_osd_request *req, *last_req = NULL;
1077         struct ceph_osd *osd;
1078         unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1079         unsigned long keepalive =
1080                 osdc->client->options->osd_keepalive_timeout * HZ;
1081         unsigned long last_stamp = 0;
1082         struct list_head slow_osds;
1083         dout("timeout\n");
1084         down_read(&osdc->map_sem);
1085
1086         ceph_monc_request_next_osdmap(&osdc->client->monc);
1087
1088         mutex_lock(&osdc->request_mutex);
1089
1090         /*
1091          * reset osds that appear to be _really_ unresponsive.  this
1092          * is a failsafe measure.. we really shouldn't be getting to
1093          * this point if the system is working properly.  the monitors
1094          * should mark the osd as failed and we should find out about
1095          * it from an updated osd map.
1096          */
1097         while (timeout && !list_empty(&osdc->req_lru)) {
1098                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1099                                  r_req_lru_item);
1100
1101                 /* hasn't been long enough since we sent it? */
1102                 if (time_before(jiffies, req->r_stamp + timeout))
1103                         break;
1104
1105                 /* hasn't been long enough since it was acked? */
1106                 if (req->r_request->ack_stamp == 0 ||
1107                     time_before(jiffies, req->r_request->ack_stamp + timeout))
1108                         break;
1109
1110                 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1111                 last_req = req;
1112                 last_stamp = req->r_stamp;
1113
1114                 osd = req->r_osd;
1115                 BUG_ON(!osd);
1116                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1117                            req->r_tid, osd->o_osd);
1118                 __kick_osd_requests(osdc, osd);
1119         }
1120
1121         /*
1122          * ping osds that are a bit slow.  this ensures that if there
1123          * is a break in the TCP connection we will notice, and reopen
1124          * a connection with that osd (from the fault callback).
1125          */
1126         INIT_LIST_HEAD(&slow_osds);
1127         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1128                 if (time_before(jiffies, req->r_stamp + keepalive))
1129                         break;
1130
1131                 osd = req->r_osd;
1132                 BUG_ON(!osd);
1133                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1134                      req->r_tid, osd->o_osd);
1135                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1136         }
1137         while (!list_empty(&slow_osds)) {
1138                 osd = list_entry(slow_osds.next, struct ceph_osd,
1139                                  o_keepalive_item);
1140                 list_del_init(&osd->o_keepalive_item);
1141                 ceph_con_keepalive(&osd->o_con);
1142         }
1143
1144         __schedule_osd_timeout(osdc);
1145         mutex_unlock(&osdc->request_mutex);
1146         send_queued(osdc);
1147         up_read(&osdc->map_sem);
1148 }
1149
1150 static void handle_osds_timeout(struct work_struct *work)
1151 {
1152         struct ceph_osd_client *osdc =
1153                 container_of(work, struct ceph_osd_client,
1154                              osds_timeout_work.work);
1155         unsigned long delay =
1156                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1157
1158         dout("osds timeout\n");
1159         down_read(&osdc->map_sem);
1160         remove_old_osds(osdc);
1161         up_read(&osdc->map_sem);
1162
1163         schedule_delayed_work(&osdc->osds_timeout_work,
1164                               round_jiffies_relative(delay));
1165 }
1166
1167 static void complete_request(struct ceph_osd_request *req)
1168 {
1169         if (req->r_safe_callback)
1170                 req->r_safe_callback(req, NULL);
1171         complete_all(&req->r_safe_completion);  /* fsync waiter */
1172 }
1173
1174 /*
1175  * handle osd op reply.  either call the callback if it is specified,
1176  * or do the completion to wake up the waiting thread.
1177  */
1178 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1179                          struct ceph_connection *con)
1180 {
1181         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1182         struct ceph_osd_request *req;
1183         u64 tid;
1184         int numops, object_len, flags;
1185         s32 result;
1186
1187         tid = le64_to_cpu(msg->hdr.tid);
1188         if (msg->front.iov_len < sizeof(*rhead))
1189                 goto bad;
1190         numops = le32_to_cpu(rhead->num_ops);
1191         object_len = le32_to_cpu(rhead->object_len);
1192         result = le32_to_cpu(rhead->result);
1193         if (msg->front.iov_len != sizeof(*rhead) + object_len +
1194             numops * sizeof(struct ceph_osd_op))
1195                 goto bad;
1196         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1197         /* lookup */
1198         mutex_lock(&osdc->request_mutex);
1199         req = __lookup_request(osdc, tid);
1200         if (req == NULL) {
1201                 dout("handle_reply tid %llu dne\n", tid);
1202                 mutex_unlock(&osdc->request_mutex);
1203                 return;
1204         }
1205         ceph_osdc_get_request(req);
1206         flags = le32_to_cpu(rhead->flags);
1207
1208         /*
1209          * if this connection filled our message, drop our reference now, to
1210          * avoid a (safe but slower) revoke later.
1211          */
1212         if (req->r_con_filling_msg == con && req->r_reply == msg) {
1213                 dout(" dropping con_filling_msg ref %p\n", con);
1214                 req->r_con_filling_msg = NULL;
1215                 ceph_con_put(con);
1216         }
1217
1218         if (!req->r_got_reply) {
1219                 unsigned bytes;
1220
1221                 req->r_result = le32_to_cpu(rhead->result);
1222                 bytes = le32_to_cpu(msg->hdr.data_len);
1223                 dout("handle_reply result %d bytes %d\n", req->r_result,
1224                      bytes);
1225                 if (req->r_result == 0)
1226                         req->r_result = bytes;
1227
1228                 /* in case this is a write and we need to replay, */
1229                 req->r_reassert_version = rhead->reassert_version;
1230
1231                 req->r_got_reply = 1;
1232         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1233                 dout("handle_reply tid %llu dup ack\n", tid);
1234                 mutex_unlock(&osdc->request_mutex);
1235                 goto done;
1236         }
1237
1238         dout("handle_reply tid %llu flags %d\n", tid, flags);
1239
1240         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1241                 __register_linger_request(osdc, req);
1242
1243         /* either this is a read, or we got the safe response */
1244         if (result < 0 ||
1245             (flags & CEPH_OSD_FLAG_ONDISK) ||
1246             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1247                 __unregister_request(osdc, req);
1248
1249         mutex_unlock(&osdc->request_mutex);
1250
1251         if (req->r_callback)
1252                 req->r_callback(req, msg);
1253         else
1254                 complete_all(&req->r_completion);
1255
1256         if (flags & CEPH_OSD_FLAG_ONDISK)
1257                 complete_request(req);
1258
1259 done:
1260         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1261         ceph_osdc_put_request(req);
1262         return;
1263
1264 bad:
1265         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1266                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1267                (int)sizeof(*rhead));
1268         ceph_msg_dump(msg);
1269 }
1270
1271 static void reset_changed_osds(struct ceph_osd_client *osdc)
1272 {
1273         struct rb_node *p, *n;
1274
1275         for (p = rb_first(&osdc->osds); p; p = n) {
1276                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1277
1278                 n = rb_next(p);
1279                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1280                     memcmp(&osd->o_con.peer_addr,
1281                            ceph_osd_addr(osdc->osdmap,
1282                                          osd->o_osd),
1283                            sizeof(struct ceph_entity_addr)) != 0)
1284                         __reset_osd(osdc, osd);
1285         }
1286 }
1287
1288 /*
1289  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1290  * no osd, request a new map.
1291  *
1292  * Caller should hold map_sem for read and request_mutex.
1293  */
1294 static void kick_requests(struct ceph_osd_client *osdc)
1295 {
1296         struct ceph_osd_request *req, *nreq;
1297         struct rb_node *p;
1298         int needmap = 0;
1299         int err;
1300
1301         dout("kick_requests\n");
1302         mutex_lock(&osdc->request_mutex);
1303         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1304                 req = rb_entry(p, struct ceph_osd_request, r_node);
1305                 err = __map_request(osdc, req);
1306                 if (err < 0)
1307                         continue;  /* error */
1308                 if (req->r_osd == NULL) {
1309                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1310                         needmap++;  /* request a newer map */
1311                 } else if (err > 0) {
1312                         dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1313                              req->r_osd ? req->r_osd->o_osd : -1);
1314                         if (!req->r_linger)
1315                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1316                 }
1317         }
1318
1319         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1320                                  r_linger_item) {
1321                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1322
1323                 err = __map_request(osdc, req);
1324                 if (err == 0)
1325                         continue;  /* no change and no osd was specified */
1326                 if (err < 0)
1327                         continue;  /* hrm! */
1328                 if (req->r_osd == NULL) {
1329                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1330                         needmap++;  /* request a newer map */
1331                         continue;
1332                 }
1333
1334                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1335                      req->r_osd ? req->r_osd->o_osd : -1);
1336                 __unregister_linger_request(osdc, req);
1337                 __register_request(osdc, req);
1338         }
1339         mutex_unlock(&osdc->request_mutex);
1340
1341         if (needmap) {
1342                 dout("%d requests for down osds, need new map\n", needmap);
1343                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1344         }
1345 }
1346
1347
1348 /*
1349  * Process updated osd map.
1350  *
1351  * The message contains any number of incremental and full maps, normally
1352  * indicating some sort of topology change in the cluster.  Kick requests
1353  * off to different OSDs as needed.
1354  */
1355 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1356 {
1357         void *p, *end, *next;
1358         u32 nr_maps, maplen;
1359         u32 epoch;
1360         struct ceph_osdmap *newmap = NULL, *oldmap;
1361         int err;
1362         struct ceph_fsid fsid;
1363
1364         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1365         p = msg->front.iov_base;
1366         end = p + msg->front.iov_len;
1367
1368         /* verify fsid */
1369         ceph_decode_need(&p, end, sizeof(fsid), bad);
1370         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1371         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1372                 return;
1373
1374         down_write(&osdc->map_sem);
1375
1376         /* incremental maps */
1377         ceph_decode_32_safe(&p, end, nr_maps, bad);
1378         dout(" %d inc maps\n", nr_maps);
1379         while (nr_maps > 0) {
1380                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1381                 epoch = ceph_decode_32(&p);
1382                 maplen = ceph_decode_32(&p);
1383                 ceph_decode_need(&p, end, maplen, bad);
1384                 next = p + maplen;
1385                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1386                         dout("applying incremental map %u len %d\n",
1387                              epoch, maplen);
1388                         newmap = osdmap_apply_incremental(&p, next,
1389                                                           osdc->osdmap,
1390                                                           osdc->client->msgr);
1391                         if (IS_ERR(newmap)) {
1392                                 err = PTR_ERR(newmap);
1393                                 goto bad;
1394                         }
1395                         BUG_ON(!newmap);
1396                         if (newmap != osdc->osdmap) {
1397                                 ceph_osdmap_destroy(osdc->osdmap);
1398                                 osdc->osdmap = newmap;
1399                         }
1400                         kick_requests(osdc);
1401                         reset_changed_osds(osdc);
1402                 } else {
1403                         dout("ignoring incremental map %u len %d\n",
1404                              epoch, maplen);
1405                 }
1406                 p = next;
1407                 nr_maps--;
1408         }
1409         if (newmap)
1410                 goto done;
1411
1412         /* full maps */
1413         ceph_decode_32_safe(&p, end, nr_maps, bad);
1414         dout(" %d full maps\n", nr_maps);
1415         while (nr_maps) {
1416                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1417                 epoch = ceph_decode_32(&p);
1418                 maplen = ceph_decode_32(&p);
1419                 ceph_decode_need(&p, end, maplen, bad);
1420                 if (nr_maps > 1) {
1421                         dout("skipping non-latest full map %u len %d\n",
1422                              epoch, maplen);
1423                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1424                         dout("skipping full map %u len %d, "
1425                              "older than our %u\n", epoch, maplen,
1426                              osdc->osdmap->epoch);
1427                 } else {
1428                         dout("taking full map %u len %d\n", epoch, maplen);
1429                         newmap = osdmap_decode(&p, p+maplen);
1430                         if (IS_ERR(newmap)) {
1431                                 err = PTR_ERR(newmap);
1432                                 goto bad;
1433                         }
1434                         BUG_ON(!newmap);
1435                         oldmap = osdc->osdmap;
1436                         osdc->osdmap = newmap;
1437                         if (oldmap)
1438                                 ceph_osdmap_destroy(oldmap);
1439                         kick_requests(osdc);
1440                 }
1441                 p += maplen;
1442                 nr_maps--;
1443         }
1444
1445 done:
1446         downgrade_write(&osdc->map_sem);
1447         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1448
1449         /*
1450          * subscribe to subsequent osdmap updates if full to ensure
1451          * we find out when we are no longer full and stop returning
1452          * ENOSPC.
1453          */
1454         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1455                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1456
1457         send_queued(osdc);
1458         up_read(&osdc->map_sem);
1459         wake_up_all(&osdc->client->auth_wq);
1460         return;
1461
1462 bad:
1463         pr_err("osdc handle_map corrupt msg\n");
1464         ceph_msg_dump(msg);
1465         up_write(&osdc->map_sem);
1466         return;
1467 }
1468
1469 /*
1470  * watch/notify callback event infrastructure
1471  *
1472  * These callbacks are used both for watch and notify operations.
1473  */
1474 static void __release_event(struct kref *kref)
1475 {
1476         struct ceph_osd_event *event =
1477                 container_of(kref, struct ceph_osd_event, kref);
1478
1479         dout("__release_event %p\n", event);
1480         kfree(event);
1481 }
1482
1483 static void get_event(struct ceph_osd_event *event)
1484 {
1485         kref_get(&event->kref);
1486 }
1487
1488 void ceph_osdc_put_event(struct ceph_osd_event *event)
1489 {
1490         kref_put(&event->kref, __release_event);
1491 }
1492 EXPORT_SYMBOL(ceph_osdc_put_event);
1493
1494 static void __insert_event(struct ceph_osd_client *osdc,
1495                              struct ceph_osd_event *new)
1496 {
1497         struct rb_node **p = &osdc->event_tree.rb_node;
1498         struct rb_node *parent = NULL;
1499         struct ceph_osd_event *event = NULL;
1500
1501         while (*p) {
1502                 parent = *p;
1503                 event = rb_entry(parent, struct ceph_osd_event, node);
1504                 if (new->cookie < event->cookie)
1505                         p = &(*p)->rb_left;
1506                 else if (new->cookie > event->cookie)
1507                         p = &(*p)->rb_right;
1508                 else
1509                         BUG();
1510         }
1511
1512         rb_link_node(&new->node, parent, p);
1513         rb_insert_color(&new->node, &osdc->event_tree);
1514 }
1515
1516 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1517                                                 u64 cookie)
1518 {
1519         struct rb_node **p = &osdc->event_tree.rb_node;
1520         struct rb_node *parent = NULL;
1521         struct ceph_osd_event *event = NULL;
1522
1523         while (*p) {
1524                 parent = *p;
1525                 event = rb_entry(parent, struct ceph_osd_event, node);
1526                 if (cookie < event->cookie)
1527                         p = &(*p)->rb_left;
1528                 else if (cookie > event->cookie)
1529                         p = &(*p)->rb_right;
1530                 else
1531                         return event;
1532         }
1533         return NULL;
1534 }
1535
1536 static void __remove_event(struct ceph_osd_event *event)
1537 {
1538         struct ceph_osd_client *osdc = event->osdc;
1539
1540         if (!RB_EMPTY_NODE(&event->node)) {
1541                 dout("__remove_event removed %p\n", event);
1542                 rb_erase(&event->node, &osdc->event_tree);
1543                 ceph_osdc_put_event(event);
1544         } else {
1545                 dout("__remove_event didn't remove %p\n", event);
1546         }
1547 }
1548
1549 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1550                            void (*event_cb)(u64, u64, u8, void *),
1551                            int one_shot, void *data,
1552                            struct ceph_osd_event **pevent)
1553 {
1554         struct ceph_osd_event *event;
1555
1556         event = kmalloc(sizeof(*event), GFP_NOIO);
1557         if (!event)
1558                 return -ENOMEM;
1559
1560         dout("create_event %p\n", event);
1561         event->cb = event_cb;
1562         event->one_shot = one_shot;
1563         event->data = data;
1564         event->osdc = osdc;
1565         INIT_LIST_HEAD(&event->osd_node);
1566         kref_init(&event->kref);   /* one ref for us */
1567         kref_get(&event->kref);    /* one ref for the caller */
1568         init_completion(&event->completion);
1569
1570         spin_lock(&osdc->event_lock);
1571         event->cookie = ++osdc->event_count;
1572         __insert_event(osdc, event);
1573         spin_unlock(&osdc->event_lock);
1574
1575         *pevent = event;
1576         return 0;
1577 }
1578 EXPORT_SYMBOL(ceph_osdc_create_event);
1579
1580 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1581 {
1582         struct ceph_osd_client *osdc = event->osdc;
1583
1584         dout("cancel_event %p\n", event);
1585         spin_lock(&osdc->event_lock);
1586         __remove_event(event);
1587         spin_unlock(&osdc->event_lock);
1588         ceph_osdc_put_event(event); /* caller's */
1589 }
1590 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1591
1592
1593 static void do_event_work(struct work_struct *work)
1594 {
1595         struct ceph_osd_event_work *event_work =
1596                 container_of(work, struct ceph_osd_event_work, work);
1597         struct ceph_osd_event *event = event_work->event;
1598         u64 ver = event_work->ver;
1599         u64 notify_id = event_work->notify_id;
1600         u8 opcode = event_work->opcode;
1601
1602         dout("do_event_work completing %p\n", event);
1603         event->cb(ver, notify_id, opcode, event->data);
1604         complete(&event->completion);
1605         dout("do_event_work completed %p\n", event);
1606         ceph_osdc_put_event(event);
1607         kfree(event_work);
1608 }
1609
1610
1611 /*
1612  * Process osd watch notifications
1613  */
1614 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1615 {
1616         void *p, *end;
1617         u8 proto_ver;
1618         u64 cookie, ver, notify_id;
1619         u8 opcode;
1620         struct ceph_osd_event *event;
1621         struct ceph_osd_event_work *event_work;
1622
1623         p = msg->front.iov_base;
1624         end = p + msg->front.iov_len;
1625
1626         ceph_decode_8_safe(&p, end, proto_ver, bad);
1627         ceph_decode_8_safe(&p, end, opcode, bad);
1628         ceph_decode_64_safe(&p, end, cookie, bad);
1629         ceph_decode_64_safe(&p, end, ver, bad);
1630         ceph_decode_64_safe(&p, end, notify_id, bad);
1631
1632         spin_lock(&osdc->event_lock);
1633         event = __find_event(osdc, cookie);
1634         if (event) {
1635                 get_event(event);
1636                 if (event->one_shot)
1637                         __remove_event(event);
1638         }
1639         spin_unlock(&osdc->event_lock);
1640         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1641              cookie, ver, event);
1642         if (event) {
1643                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1644                 if (!event_work) {
1645                         dout("ERROR: could not allocate event_work\n");
1646                         goto done_err;
1647                 }
1648                 INIT_WORK(&event_work->work, do_event_work);
1649                 event_work->event = event;
1650                 event_work->ver = ver;
1651                 event_work->notify_id = notify_id;
1652                 event_work->opcode = opcode;
1653                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1654                         dout("WARNING: failed to queue notify event work\n");
1655                         goto done_err;
1656                 }
1657         }
1658
1659         return;
1660
1661 done_err:
1662         complete(&event->completion);
1663         ceph_osdc_put_event(event);
1664         return;
1665
1666 bad:
1667         pr_err("osdc handle_watch_notify corrupt msg\n");
1668         return;
1669 }
1670
1671 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1672 {
1673         int err;
1674
1675         dout("wait_event %p\n", event);
1676         err = wait_for_completion_interruptible_timeout(&event->completion,
1677                                                         timeout * HZ);
1678         ceph_osdc_put_event(event);
1679         if (err > 0)
1680                 err = 0;
1681         dout("wait_event %p returns %d\n", event, err);
1682         return err;
1683 }
1684 EXPORT_SYMBOL(ceph_osdc_wait_event);
1685
1686 /*
1687  * Register request, send initial attempt.
1688  */
1689 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1690                             struct ceph_osd_request *req,
1691                             bool nofail)
1692 {
1693         int rc = 0;
1694
1695         req->r_request->pages = req->r_pages;
1696         req->r_request->nr_pages = req->r_num_pages;
1697 #ifdef CONFIG_BLOCK
1698         req->r_request->bio = req->r_bio;
1699 #endif
1700         req->r_request->trail = req->r_trail;
1701
1702         register_request(osdc, req);
1703
1704         down_read(&osdc->map_sem);
1705         mutex_lock(&osdc->request_mutex);
1706         /*
1707          * a racing kick_requests() may have sent the message for us
1708          * while we dropped request_mutex above, so only send now if
1709          * the request still han't been touched yet.
1710          */
1711         if (req->r_sent == 0) {
1712                 rc = __map_request(osdc, req);
1713                 if (rc < 0) {
1714                         if (nofail) {
1715                                 dout("osdc_start_request failed map, "
1716                                      " will retry %lld\n", req->r_tid);
1717                                 rc = 0;
1718                         }
1719                         goto out_unlock;
1720                 }
1721                 if (req->r_osd == NULL) {
1722                         dout("send_request %p no up osds in pg\n", req);
1723                         ceph_monc_request_next_osdmap(&osdc->client->monc);
1724                 } else {
1725                         rc = __send_request(osdc, req);
1726                         if (rc) {
1727                                 if (nofail) {
1728                                         dout("osdc_start_request failed send, "
1729                                              " will retry %lld\n", req->r_tid);
1730                                         rc = 0;
1731                                 } else {
1732                                         __unregister_request(osdc, req);
1733                                 }
1734                         }
1735                 }
1736         }
1737
1738 out_unlock:
1739         mutex_unlock(&osdc->request_mutex);
1740         up_read(&osdc->map_sem);
1741         return rc;
1742 }
1743 EXPORT_SYMBOL(ceph_osdc_start_request);
1744
1745 /*
1746  * wait for a request to complete
1747  */
1748 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1749                            struct ceph_osd_request *req)
1750 {
1751         int rc;
1752
1753         rc = wait_for_completion_interruptible(&req->r_completion);
1754         if (rc < 0) {
1755                 mutex_lock(&osdc->request_mutex);
1756                 __cancel_request(req);
1757                 __unregister_request(osdc, req);
1758                 mutex_unlock(&osdc->request_mutex);
1759                 complete_request(req);
1760                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1761                 return rc;
1762         }
1763
1764         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1765         return req->r_result;
1766 }
1767 EXPORT_SYMBOL(ceph_osdc_wait_request);
1768
1769 /*
1770  * sync - wait for all in-flight requests to flush.  avoid starvation.
1771  */
1772 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1773 {
1774         struct ceph_osd_request *req;
1775         u64 last_tid, next_tid = 0;
1776
1777         mutex_lock(&osdc->request_mutex);
1778         last_tid = osdc->last_tid;
1779         while (1) {
1780                 req = __lookup_request_ge(osdc, next_tid);
1781                 if (!req)
1782                         break;
1783                 if (req->r_tid > last_tid)
1784                         break;
1785
1786                 next_tid = req->r_tid + 1;
1787                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1788                         continue;
1789
1790                 ceph_osdc_get_request(req);
1791                 mutex_unlock(&osdc->request_mutex);
1792                 dout("sync waiting on tid %llu (last is %llu)\n",
1793                      req->r_tid, last_tid);
1794                 wait_for_completion(&req->r_safe_completion);
1795                 mutex_lock(&osdc->request_mutex);
1796                 ceph_osdc_put_request(req);
1797         }
1798         mutex_unlock(&osdc->request_mutex);
1799         dout("sync done (thru tid %llu)\n", last_tid);
1800 }
1801 EXPORT_SYMBOL(ceph_osdc_sync);
1802
1803 /*
1804  * init, shutdown
1805  */
1806 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1807 {
1808         int err;
1809
1810         dout("init\n");
1811         osdc->client = client;
1812         osdc->osdmap = NULL;
1813         init_rwsem(&osdc->map_sem);
1814         init_completion(&osdc->map_waiters);
1815         osdc->last_requested_map = 0;
1816         mutex_init(&osdc->request_mutex);
1817         osdc->last_tid = 0;
1818         osdc->osds = RB_ROOT;
1819         INIT_LIST_HEAD(&osdc->osd_lru);
1820         osdc->requests = RB_ROOT;
1821         INIT_LIST_HEAD(&osdc->req_lru);
1822         INIT_LIST_HEAD(&osdc->req_unsent);
1823         INIT_LIST_HEAD(&osdc->req_notarget);
1824         INIT_LIST_HEAD(&osdc->req_linger);
1825         osdc->num_requests = 0;
1826         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1827         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1828         spin_lock_init(&osdc->event_lock);
1829         osdc->event_tree = RB_ROOT;
1830         osdc->event_count = 0;
1831
1832         schedule_delayed_work(&osdc->osds_timeout_work,
1833            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1834
1835         err = -ENOMEM;
1836         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1837                                         sizeof(struct ceph_osd_request));
1838         if (!osdc->req_mempool)
1839                 goto out;
1840
1841         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1842                                 "osd_op");
1843         if (err < 0)
1844                 goto out_mempool;
1845         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1846                                 OSD_OPREPLY_FRONT_LEN, 10, true,
1847                                 "osd_op_reply");
1848         if (err < 0)
1849                 goto out_msgpool;
1850
1851         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1852         if (IS_ERR(osdc->notify_wq)) {
1853                 err = PTR_ERR(osdc->notify_wq);
1854                 osdc->notify_wq = NULL;
1855                 goto out_msgpool;
1856         }
1857         return 0;
1858
1859 out_msgpool:
1860         ceph_msgpool_destroy(&osdc->msgpool_op);
1861 out_mempool:
1862         mempool_destroy(osdc->req_mempool);
1863 out:
1864         return err;
1865 }
1866 EXPORT_SYMBOL(ceph_osdc_init);
1867
1868 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1869 {
1870         flush_workqueue(osdc->notify_wq);
1871         destroy_workqueue(osdc->notify_wq);
1872         cancel_delayed_work_sync(&osdc->timeout_work);
1873         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1874         if (osdc->osdmap) {
1875                 ceph_osdmap_destroy(osdc->osdmap);
1876                 osdc->osdmap = NULL;
1877         }
1878         remove_all_osds(osdc);
1879         mempool_destroy(osdc->req_mempool);
1880         ceph_msgpool_destroy(&osdc->msgpool_op);
1881         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1882 }
1883 EXPORT_SYMBOL(ceph_osdc_stop);
1884
1885 /*
1886  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1887  * *plen.  Return number of bytes read, or error.
1888  */
1889 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1890                         struct ceph_vino vino, struct ceph_file_layout *layout,
1891                         u64 off, u64 *plen,
1892                         u32 truncate_seq, u64 truncate_size,
1893                         struct page **pages, int num_pages, int page_align)
1894 {
1895         struct ceph_osd_request *req;
1896         int rc = 0;
1897
1898         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1899              vino.snap, off, *plen);
1900         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1901                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1902                                     NULL, 0, truncate_seq, truncate_size, NULL,
1903                                     false, 1, page_align);
1904         if (!req)
1905                 return -ENOMEM;
1906
1907         /* it may be a short read due to an object boundary */
1908         req->r_pages = pages;
1909
1910         dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
1911              off, *plen, req->r_num_pages, page_align);
1912
1913         rc = ceph_osdc_start_request(osdc, req, false);
1914         if (!rc)
1915                 rc = ceph_osdc_wait_request(osdc, req);
1916
1917         ceph_osdc_put_request(req);
1918         dout("readpages result %d\n", rc);
1919         return rc;
1920 }
1921 EXPORT_SYMBOL(ceph_osdc_readpages);
1922
1923 /*
1924  * do a synchronous write on N pages
1925  */
1926 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1927                          struct ceph_file_layout *layout,
1928                          struct ceph_snap_context *snapc,
1929                          u64 off, u64 len,
1930                          u32 truncate_seq, u64 truncate_size,
1931                          struct timespec *mtime,
1932                          struct page **pages, int num_pages,
1933                          int flags, int do_sync, bool nofail)
1934 {
1935         struct ceph_osd_request *req;
1936         int rc = 0;
1937         int page_align = off & ~PAGE_MASK;
1938
1939         BUG_ON(vino.snap != CEPH_NOSNAP);
1940         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1941                                     CEPH_OSD_OP_WRITE,
1942                                     flags | CEPH_OSD_FLAG_ONDISK |
1943                                             CEPH_OSD_FLAG_WRITE,
1944                                     snapc, do_sync,
1945                                     truncate_seq, truncate_size, mtime,
1946                                     nofail, 1, page_align);
1947         if (!req)
1948                 return -ENOMEM;
1949
1950         /* it may be a short write due to an object boundary */
1951         req->r_pages = pages;
1952         dout("writepages %llu~%llu (%d pages)\n", off, len,
1953              req->r_num_pages);
1954
1955         rc = ceph_osdc_start_request(osdc, req, nofail);
1956         if (!rc)
1957                 rc = ceph_osdc_wait_request(osdc, req);
1958
1959         ceph_osdc_put_request(req);
1960         if (rc == 0)
1961                 rc = len;
1962         dout("writepages result %d\n", rc);
1963         return rc;
1964 }
1965 EXPORT_SYMBOL(ceph_osdc_writepages);
1966
1967 /*
1968  * handle incoming message
1969  */
1970 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1971 {
1972         struct ceph_osd *osd = con->private;
1973         struct ceph_osd_client *osdc;
1974         int type = le16_to_cpu(msg->hdr.type);
1975
1976         if (!osd)
1977                 goto out;
1978         osdc = osd->o_osdc;
1979
1980         switch (type) {
1981         case CEPH_MSG_OSD_MAP:
1982                 ceph_osdc_handle_map(osdc, msg);
1983                 break;
1984         case CEPH_MSG_OSD_OPREPLY:
1985                 handle_reply(osdc, msg, con);
1986                 break;
1987         case CEPH_MSG_WATCH_NOTIFY:
1988                 handle_watch_notify(osdc, msg);
1989                 break;
1990
1991         default:
1992                 pr_err("received unknown message type %d %s\n", type,
1993                        ceph_msg_type_name(type));
1994         }
1995 out:
1996         ceph_msg_put(msg);
1997 }
1998
1999 /*
2000  * lookup and return message for incoming reply.  set up reply message
2001  * pages.
2002  */
2003 static struct ceph_msg *get_reply(struct ceph_connection *con,
2004                                   struct ceph_msg_header *hdr,
2005                                   int *skip)
2006 {
2007         struct ceph_osd *osd = con->private;
2008         struct ceph_osd_client *osdc = osd->o_osdc;
2009         struct ceph_msg *m;
2010         struct ceph_osd_request *req;
2011         int front = le32_to_cpu(hdr->front_len);
2012         int data_len = le32_to_cpu(hdr->data_len);
2013         u64 tid;
2014
2015         tid = le64_to_cpu(hdr->tid);
2016         mutex_lock(&osdc->request_mutex);
2017         req = __lookup_request(osdc, tid);
2018         if (!req) {
2019                 *skip = 1;
2020                 m = NULL;
2021                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
2022                         osd->o_osd);
2023                 goto out;
2024         }
2025
2026         if (req->r_con_filling_msg) {
2027                 dout("get_reply revoking msg %p from old con %p\n",
2028                      req->r_reply, req->r_con_filling_msg);
2029                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
2030                 ceph_con_put(req->r_con_filling_msg);
2031                 req->r_con_filling_msg = NULL;
2032         }
2033
2034         if (front > req->r_reply->front.iov_len) {
2035                 pr_warning("get_reply front %d > preallocated %d\n",
2036                            front, (int)req->r_reply->front.iov_len);
2037                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
2038                 if (!m)
2039                         goto out;
2040                 ceph_msg_put(req->r_reply);
2041                 req->r_reply = m;
2042         }
2043         m = ceph_msg_get(req->r_reply);
2044
2045         if (data_len > 0) {
2046                 int want = calc_pages_for(req->r_page_alignment, data_len);
2047
2048                 if (unlikely(req->r_num_pages < want)) {
2049                         pr_warning("tid %lld reply has %d bytes %d pages, we"
2050                                    " had only %d pages ready\n", tid, data_len,
2051                                    want, req->r_num_pages);
2052                         *skip = 1;
2053                         ceph_msg_put(m);
2054                         m = NULL;
2055                         goto out;
2056                 }
2057                 m->pages = req->r_pages;
2058                 m->nr_pages = req->r_num_pages;
2059                 m->page_alignment = req->r_page_alignment;
2060 #ifdef CONFIG_BLOCK
2061                 m->bio = req->r_bio;
2062 #endif
2063         }
2064         *skip = 0;
2065         req->r_con_filling_msg = ceph_con_get(con);
2066         dout("get_reply tid %lld %p\n", tid, m);
2067
2068 out:
2069         mutex_unlock(&osdc->request_mutex);
2070         return m;
2071
2072 }
2073
2074 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2075                                   struct ceph_msg_header *hdr,
2076                                   int *skip)
2077 {
2078         struct ceph_osd *osd = con->private;
2079         int type = le16_to_cpu(hdr->type);
2080         int front = le32_to_cpu(hdr->front_len);
2081
2082         switch (type) {
2083         case CEPH_MSG_OSD_MAP:
2084         case CEPH_MSG_WATCH_NOTIFY:
2085                 return ceph_msg_new(type, front, GFP_NOFS);
2086         case CEPH_MSG_OSD_OPREPLY:
2087                 return get_reply(con, hdr, skip);
2088         default:
2089                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2090                         osd->o_osd);
2091                 *skip = 1;
2092                 return NULL;
2093         }
2094 }
2095
2096 /*
2097  * Wrappers to refcount containing ceph_osd struct
2098  */
2099 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2100 {
2101         struct ceph_osd *osd = con->private;
2102         if (get_osd(osd))
2103                 return con;
2104         return NULL;
2105 }
2106
2107 static void put_osd_con(struct ceph_connection *con)
2108 {
2109         struct ceph_osd *osd = con->private;
2110         put_osd(osd);
2111 }
2112
2113 /*
2114  * authentication
2115  */
2116 static int get_authorizer(struct ceph_connection *con,
2117                           void **buf, int *len, int *proto,
2118                           void **reply_buf, int *reply_len, int force_new)
2119 {
2120         struct ceph_osd *o = con->private;
2121         struct ceph_osd_client *osdc = o->o_osdc;
2122         struct ceph_auth_client *ac = osdc->client->monc.auth;
2123         int ret = 0;
2124
2125         if (force_new && o->o_authorizer) {
2126                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2127                 o->o_authorizer = NULL;
2128         }
2129         if (o->o_authorizer == NULL) {
2130                 ret = ac->ops->create_authorizer(
2131                         ac, CEPH_ENTITY_TYPE_OSD,
2132                         &o->o_authorizer,
2133                         &o->o_authorizer_buf,
2134                         &o->o_authorizer_buf_len,
2135                         &o->o_authorizer_reply_buf,
2136                         &o->o_authorizer_reply_buf_len);
2137                 if (ret)
2138                         return ret;
2139         }
2140
2141         *proto = ac->protocol;
2142         *buf = o->o_authorizer_buf;
2143         *len = o->o_authorizer_buf_len;
2144         *reply_buf = o->o_authorizer_reply_buf;
2145         *reply_len = o->o_authorizer_reply_buf_len;
2146         return 0;
2147 }
2148
2149
2150 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2151 {
2152         struct ceph_osd *o = con->private;
2153         struct ceph_osd_client *osdc = o->o_osdc;
2154         struct ceph_auth_client *ac = osdc->client->monc.auth;
2155
2156         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2157 }
2158
2159 static int invalidate_authorizer(struct ceph_connection *con)
2160 {
2161         struct ceph_osd *o = con->private;
2162         struct ceph_osd_client *osdc = o->o_osdc;
2163         struct ceph_auth_client *ac = osdc->client->monc.auth;
2164
2165         if (ac->ops->invalidate_authorizer)
2166                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2167
2168         return ceph_monc_validate_auth(&osdc->client->monc);
2169 }
2170
2171 static const struct ceph_connection_operations osd_con_ops = {
2172         .get = get_osd_con,
2173         .put = put_osd_con,
2174         .dispatch = dispatch,
2175         .get_authorizer = get_authorizer,
2176         .verify_authorizer_reply = verify_authorizer_reply,
2177         .invalidate_authorizer = invalidate_authorizer,
2178         .alloc_msg = alloc_msg,
2179         .fault = osd_reset,
2180 };