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         sprintf(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 (IS_ERR(req))
 474                 return req;
 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 alignment that calc_layout
 481            filled in for us */
 482         req->r_page_alignment = page_align;
 483
 484         ceph_osdc_build_request(req, off, plen, ops,
 485                                 snapc,
 486                                 mtime,
 487                                 req->r_oid, req->r_oid_len);
 488
 489         return req;
 490 }
 491 EXPORT_SYMBOL(ceph_osdc_new_request);
 492
 493 /*
 494  * We keep osd requests in an rbtree, sorted by ->r_tid.
 495  */
 496 static void __insert_request(struct ceph_osd_client *osdc,
 497                              struct ceph_osd_request *new)
 498 {
 499         struct rb_node **p = &osdc->requests.rb_node;
 500         struct rb_node *parent = NULL;
 501         struct ceph_osd_request *req = NULL;
 502
 503         while (*p) {
 504                 parent = *p;
 505                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 506                 if (new->r_tid < req->r_tid)
 507                         p = &(*p)->rb_left;
 508                 else if (new->r_tid > req->r_tid)
 509                         p = &(*p)->rb_right;
 510                 else
 511                         BUG();
 512         }
 513
 514         rb_link_node(&new->r_node, parent, p);
 515         rb_insert_color(&new->r_node, &osdc->requests);
 516 }
 517
 518 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 519                                                  u64 tid)
 520 {
 521         struct ceph_osd_request *req;
 522         struct rb_node *n = osdc->requests.rb_node;
 523
 524         while (n) {
 525                 req = rb_entry(n, struct ceph_osd_request, r_node);
 526                 if (tid < req->r_tid)
 527                         n = n->rb_left;
 528                 else if (tid > req->r_tid)
 529                         n = n->rb_right;
 530                 else
 531                         return req;
 532         }
 533         return NULL;
 534 }
 535
 536 static struct ceph_osd_request *
 537 __lookup_request_ge(struct ceph_osd_client *osdc,
 538                     u64 tid)
 539 {
 540         struct ceph_osd_request *req;
 541         struct rb_node *n = osdc->requests.rb_node;
 542
 543         while (n) {
 544                 req = rb_entry(n, struct ceph_osd_request, r_node);
 545                 if (tid < req->r_tid) {
 546                         if (!n->rb_left)
 547                                 return req;
 548                         n = n->rb_left;
 549                 } else if (tid > req->r_tid) {
 550                         n = n->rb_right;
 551                 } else {
 552                         return req;
 553                 }
 554         }
 555         return NULL;
 556 }
 557
 558 /*
 559  * Resubmit requests pending on the given osd.
 560  */
 561 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 562                                 struct ceph_osd *osd)
 563 {
 564         struct ceph_osd_request *req, *nreq;
 565         int err;
 566
 567         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 568         err = __reset_osd(osdc, osd);
 569         if (err == -EAGAIN)
 570                 return;
 571
 572         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 573                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 574                 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
 575                      osd->o_osd);
 576                 if (!req->r_linger)
 577                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 578         }
 579
 580         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 581                                  r_linger_osd) {
 582                 __unregister_linger_request(osdc, req);
 583                 __register_request(osdc, req);
 584                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 585                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 586                      osd->o_osd);
 587         }
 588 }
 589
 590 static void kick_osd_requests(struct ceph_osd_client *osdc,
 591                               struct ceph_osd *kickosd)
 592 {
 593         mutex_lock(&osdc->request_mutex);
 594         __kick_osd_requests(osdc, kickosd);
 595         mutex_unlock(&osdc->request_mutex);
 596 }
 597
 598 /*
 599  * If the osd connection drops, we need to resubmit all requests.
 600  */
 601 static void osd_reset(struct ceph_connection *con)
 602 {
 603         struct ceph_osd *osd = con->private;
 604         struct ceph_osd_client *osdc;
 605
 606         if (!osd)
 607                 return;
 608         dout("osd_reset osd%d\n", osd->o_osd);
 609         osdc = osd->o_osdc;
 610         down_read(&osdc->map_sem);
 611         kick_osd_requests(osdc, osd);
 612         send_queued(osdc);
 613         up_read(&osdc->map_sem);
 614 }
 615
 616 /*
 617  * Track open sessions with osds.
 618  */
 619 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
 620 {
 621         struct ceph_osd *osd;
 622
 623         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 624         if (!osd)
 625                 return NULL;
 626
 627         atomic_set(&osd->o_ref, 1);
 628         osd->o_osdc = osdc;
 629         INIT_LIST_HEAD(&osd->o_requests);
 630         INIT_LIST_HEAD(&osd->o_linger_requests);
 631         INIT_LIST_HEAD(&osd->o_osd_lru);
 632         osd->o_incarnation = 1;
 633
 634         ceph_con_init(osdc->client->msgr, &osd->o_con);
 635         osd->o_con.private = osd;
 636         osd->o_con.ops = &osd_con_ops;
 637         osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
 638
 639         INIT_LIST_HEAD(&osd->o_keepalive_item);
 640         return osd;
 641 }
 642
 643 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 644 {
 645         if (atomic_inc_not_zero(&osd->o_ref)) {
 646                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 647                      atomic_read(&osd->o_ref));
 648                 return osd;
 649         } else {
 650                 dout("get_osd %p FAIL\n", osd);
 651                 return NULL;
 652         }
 653 }
 654
 655 static void put_osd(struct ceph_osd *osd)
 656 {
 657         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 658              atomic_read(&osd->o_ref) - 1);
 659         if (atomic_dec_and_test(&osd->o_ref)) {
 660                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 661
 662                 if (osd->o_authorizer)
 663                         ac->ops->destroy_authorizer(ac, osd->o_authorizer);
 664                 kfree(osd);
 665         }
 666 }
 667
 668 /*
 669  * remove an osd from our map
 670  */
 671 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 672 {
 673         dout("__remove_osd %p\n", osd);
 674         BUG_ON(!list_empty(&osd->o_requests));
 675         rb_erase(&osd->o_node, &osdc->osds);
 676         list_del_init(&osd->o_osd_lru);
 677         ceph_con_close(&osd->o_con);
 678         put_osd(osd);
 679 }
 680
 681 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 682                               struct ceph_osd *osd)
 683 {
 684         dout("__move_osd_to_lru %p\n", osd);
 685         BUG_ON(!list_empty(&osd->o_osd_lru));
 686         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 687         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
 688 }
 689
 690 static void __remove_osd_from_lru(struct ceph_osd *osd)
 691 {
 692         dout("__remove_osd_from_lru %p\n", osd);
 693         if (!list_empty(&osd->o_osd_lru))
 694                 list_del_init(&osd->o_osd_lru);
 695 }
 696
 697 static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all)
 698 {
 699         struct ceph_osd *osd, *nosd;
 700
 701         dout("__remove_old_osds %p\n", osdc);
 702         mutex_lock(&osdc->request_mutex);
 703         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 704                 if (!remove_all && time_before(jiffies, osd->lru_ttl))
 705                         break;
 706                 __remove_osd(osdc, osd);
 707         }
 708         mutex_unlock(&osdc->request_mutex);
 709 }
 710
 711 /*
 712  * reset osd connect
 713  */
 714 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 715 {
 716         struct ceph_osd_request *req;
 717         int ret = 0;
 718
 719         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 720         if (list_empty(&osd->o_requests) &&
 721             list_empty(&osd->o_linger_requests)) {
 722                 __remove_osd(osdc, osd);
 723         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
 724                           &osd->o_con.peer_addr,
 725                           sizeof(osd->o_con.peer_addr)) == 0 &&
 726                    !ceph_con_opened(&osd->o_con)) {
 727                 dout(" osd addr hasn't changed and connection never opened,"
 728                      " letting msgr retry");
 729                 /* touch each r_stamp for handle_timeout()'s benfit */
 730                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
 731                         req->r_stamp = jiffies;
 732                 ret = -EAGAIN;
 733         } else {
 734                 ceph_con_close(&osd->o_con);
 735                 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
 736                 osd->o_incarnation++;
 737         }
 738         return ret;
 739 }
 740
 741 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 742 {
 743         struct rb_node **p = &osdc->osds.rb_node;
 744         struct rb_node *parent = NULL;
 745         struct ceph_osd *osd = NULL;
 746
 747         while (*p) {
 748                 parent = *p;
 749                 osd = rb_entry(parent, struct ceph_osd, o_node);
 750                 if (new->o_osd < osd->o_osd)
 751                         p = &(*p)->rb_left;
 752                 else if (new->o_osd > osd->o_osd)
 753                         p = &(*p)->rb_right;
 754                 else
 755                         BUG();
 756         }
 757
 758         rb_link_node(&new->o_node, parent, p);
 759         rb_insert_color(&new->o_node, &osdc->osds);
 760 }
 761
 762 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 763 {
 764         struct ceph_osd *osd;
 765         struct rb_node *n = osdc->osds.rb_node;
 766
 767         while (n) {
 768                 osd = rb_entry(n, struct ceph_osd, o_node);
 769                 if (o < osd->o_osd)
 770                         n = n->rb_left;
 771                 else if (o > osd->o_osd)
 772                         n = n->rb_right;
 773                 else
 774                         return osd;
 775         }
 776         return NULL;
 777 }
 778
 779 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
 780 {
 781         schedule_delayed_work(&osdc->timeout_work,
 782                         osdc->client->options->osd_keepalive_timeout * HZ);
 783 }
 784
 785 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
 786 {
 787         cancel_delayed_work(&osdc->timeout_work);
 788 }
 789
 790 /*
 791  * Register request, assign tid.  If this is the first request, set up
 792  * the timeout event.
 793  */
 794 static void __register_request(struct ceph_osd_client *osdc,
 795                                struct ceph_osd_request *req)
 796 {
 797         req->r_tid = ++osdc->last_tid;
 798         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 799         INIT_LIST_HEAD(&req->r_req_lru_item);
 800
 801         dout("register_request %p tid %lld\n", req, req->r_tid);
 802         __insert_request(osdc, req);
 803         ceph_osdc_get_request(req);
 804         osdc->num_requests++;
 805
 806         if (osdc->num_requests == 1) {
 807                 dout(" first request, scheduling timeout\n");
 808                 __schedule_osd_timeout(osdc);
 809         }
 810 }
 811
 812 static void register_request(struct ceph_osd_client *osdc,
 813                              struct ceph_osd_request *req)
 814 {
 815         mutex_lock(&osdc->request_mutex);
 816         __register_request(osdc, req);
 817         mutex_unlock(&osdc->request_mutex);
 818 }
 819
 820 /*
 821  * called under osdc->request_mutex
 822  */
 823 static void __unregister_request(struct ceph_osd_client *osdc,
 824                                  struct ceph_osd_request *req)
 825 {
 826         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 827         rb_erase(&req->r_node, &osdc->requests);
 828         osdc->num_requests--;
 829
 830         if (req->r_osd) {
 831                 /* make sure the original request isn't in flight. */
 832                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 833
 834                 list_del_init(&req->r_osd_item);
 835                 if (list_empty(&req->r_osd->o_requests) &&
 836                     list_empty(&req->r_osd->o_linger_requests)) {
 837                         dout("moving osd to %p lru\n", req->r_osd);
 838                         __move_osd_to_lru(osdc, req->r_osd);
 839                 }
 840                 if (list_empty(&req->r_linger_item))
 841                         req->r_osd = NULL;
 842         }
 843
 844         ceph_osdc_put_request(req);
 845
 846         list_del_init(&req->r_req_lru_item);
 847         if (osdc->num_requests == 0) {
 848                 dout(" no requests, canceling timeout\n");
 849                 __cancel_osd_timeout(osdc);
 850         }
 851 }
 852
 853 /*
 854  * Cancel a previously queued request message
 855  */
 856 static void __cancel_request(struct ceph_osd_request *req)
 857 {
 858         if (req->r_sent && req->r_osd) {
 859                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 860                 req->r_sent = 0;
 861         }
 862 }
 863
 864 static void __register_linger_request(struct ceph_osd_client *osdc,
 865                                     struct ceph_osd_request *req)
 866 {
 867         dout("__register_linger_request %p\n", req);
 868         list_add_tail(&req->r_linger_item, &osdc->req_linger);
 869         list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
 870 }
 871
 872 static void __unregister_linger_request(struct ceph_osd_client *osdc,
 873                                         struct ceph_osd_request *req)
 874 {
 875         dout("__unregister_linger_request %p\n", req);
 876         if (req->r_osd) {
 877                 list_del_init(&req->r_linger_item);
 878                 list_del_init(&req->r_linger_osd);
 879
 880                 if (list_empty(&req->r_osd->o_requests) &&
 881                     list_empty(&req->r_osd->o_linger_requests)) {
 882                         dout("moving osd to %p lru\n", req->r_osd);
 883                         __move_osd_to_lru(osdc, req->r_osd);
 884                 }
 885                 if (list_empty(&req->r_osd_item))
 886                         req->r_osd = NULL;
 887         }
 888 }
 889
 890 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
 891                                          struct ceph_osd_request *req)
 892 {
 893         mutex_lock(&osdc->request_mutex);
 894         if (req->r_linger) {
 895                 __unregister_linger_request(osdc, req);
 896                 ceph_osdc_put_request(req);
 897         }
 898         mutex_unlock(&osdc->request_mutex);
 899 }
 900 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
 901
 902 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 903                                   struct ceph_osd_request *req)
 904 {
 905         if (!req->r_linger) {
 906                 dout("set_request_linger %p\n", req);
 907                 req->r_linger = 1;
 908                 /*
 909                  * caller is now responsible for calling
 910                  * unregister_linger_request
 911                  */
 912                 ceph_osdc_get_request(req);
 913         }
 914 }
 915 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
 916
 917 /*
 918  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 919  * (as needed), and set the request r_osd appropriately.  If there is
 920  * no up osd, set r_osd to NULL.  Move the request to the appropiate list
 921  * (unsent, homeless) or leave on in-flight lru.
 922  *
 923  * Return 0 if unchanged, 1 if changed, or negative on error.
 924  *
 925  * Caller should hold map_sem for read and request_mutex.
 926  */
 927 static int __map_request(struct ceph_osd_client *osdc,
 928                          struct ceph_osd_request *req)
 929 {
 930         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 931         struct ceph_pg pgid;
 932         int acting[CEPH_PG_MAX_SIZE];
 933         int o = -1, num = 0;
 934         int err;
 935
 936         dout("map_request %p tid %lld\n", req, req->r_tid);
 937         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 938                                       &req->r_file_layout, osdc->osdmap);
 939         if (err) {
 940                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
 941                 return err;
 942         }
 943         pgid = reqhead->layout.ol_pgid;
 944         req->r_pgid = pgid;
 945
 946         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
 947         if (err > 0) {
 948                 o = acting[0];
 949                 num = err;
 950         }
 951
 952         if ((req->r_osd && req->r_osd->o_osd == o &&
 953              req->r_sent >= req->r_osd->o_incarnation &&
 954              req->r_num_pg_osds == num &&
 955              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
 956             (req->r_osd == NULL && o == -1))
 957                 return 0;  /* no change */
 958
 959         dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
 960              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 961              req->r_osd ? req->r_osd->o_osd : -1);
 962
 963         /* record full pg acting set */
 964         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
 965         req->r_num_pg_osds = num;
 966
 967         if (req->r_osd) {
 968                 __cancel_request(req);
 969                 list_del_init(&req->r_osd_item);
 970                 req->r_osd = NULL;
 971         }
 972
 973         req->r_osd = __lookup_osd(osdc, o);
 974         if (!req->r_osd && o >= 0) {
 975                 err = -ENOMEM;
 976                 req->r_osd = create_osd(osdc);
 977                 if (!req->r_osd) {
 978                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
 979                         goto out;
 980                 }
 981
 982                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
 983                 req->r_osd->o_osd = o;
 984                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
 985                 __insert_osd(osdc, req->r_osd);
 986
 987                 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
 988         }
 989
 990         if (req->r_osd) {
 991                 __remove_osd_from_lru(req->r_osd);
 992                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 993                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 994         } else {
 995                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
 996         }
 997         err = 1;   /* osd or pg changed */
 998
 999 out:
1000         return err;
1001 }
1002
1003 /*
1004  * caller should hold map_sem (for read) and request_mutex
1005  */
1006 static int __send_request(struct ceph_osd_client *osdc,
1007                           struct ceph_osd_request *req)
1008 {
1009         struct ceph_osd_request_head *reqhead;
1010
1011         dout("send_request %p tid %llu to osd%d flags %d\n",
1012              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1013
1014         reqhead = req->r_request->front.iov_base;
1015         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1016         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
1017         reqhead->reassert_version = req->r_reassert_version;
1018
1019         req->r_stamp = jiffies;
1020         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1021
1022         ceph_msg_get(req->r_request); /* send consumes a ref */
1023         ceph_con_send(&req->r_osd->o_con, req->r_request);
1024         req->r_sent = req->r_osd->o_incarnation;
1025         return 0;
1026 }
1027
1028 /*
1029  * Send any requests in the queue (req_unsent).
1030  */
1031 static void send_queued(struct ceph_osd_client *osdc)
1032 {
1033         struct ceph_osd_request *req, *tmp;
1034
1035         dout("send_queued\n");
1036         mutex_lock(&osdc->request_mutex);
1037         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1038                 __send_request(osdc, req);
1039         }
1040         mutex_unlock(&osdc->request_mutex);
1041 }
1042
1043 /*
1044  * Timeout callback, called every N seconds when 1 or more osd
1045  * requests has been active for more than N seconds.  When this
1046  * happens, we ping all OSDs with requests who have timed out to
1047  * ensure any communications channel reset is detected.  Reset the
1048  * request timeouts another N seconds in the future as we go.
1049  * Reschedule the timeout event another N seconds in future (unless
1050  * there are no open requests).
1051  */
1052 static void handle_timeout(struct work_struct *work)
1053 {
1054         struct ceph_osd_client *osdc =
1055                 container_of(work, struct ceph_osd_client, timeout_work.work);
1056         struct ceph_osd_request *req, *last_req = NULL;
1057         struct ceph_osd *osd;
1058         unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1059         unsigned long keepalive =
1060                 osdc->client->options->osd_keepalive_timeout * HZ;
1061         unsigned long last_stamp = 0;
1062         struct list_head slow_osds;
1063         dout("timeout\n");
1064         down_read(&osdc->map_sem);
1065
1066         ceph_monc_request_next_osdmap(&osdc->client->monc);
1067
1068         mutex_lock(&osdc->request_mutex);
1069
1070         /*
1071          * reset osds that appear to be _really_ unresponsive.  this
1072          * is a failsafe measure.. we really shouldn't be getting to
1073          * this point if the system is working properly.  the monitors
1074          * should mark the osd as failed and we should find out about
1075          * it from an updated osd map.
1076          */
1077         while (timeout && !list_empty(&osdc->req_lru)) {
1078                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1079                                  r_req_lru_item);
1080
1081                 if (time_before(jiffies, req->r_stamp + timeout))
1082                         break;
1083
1084                 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1085                 last_req = req;
1086                 last_stamp = req->r_stamp;
1087
1088                 osd = req->r_osd;
1089                 BUG_ON(!osd);
1090                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1091                            req->r_tid, osd->o_osd);
1092                 __kick_osd_requests(osdc, osd);
1093         }
1094
1095         /*
1096          * ping osds that are a bit slow.  this ensures that if there
1097          * is a break in the TCP connection we will notice, and reopen
1098          * a connection with that osd (from the fault callback).
1099          */
1100         INIT_LIST_HEAD(&slow_osds);
1101         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1102                 if (time_before(jiffies, req->r_stamp + keepalive))
1103                         break;
1104
1105                 osd = req->r_osd;
1106                 BUG_ON(!osd);
1107                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1108                      req->r_tid, osd->o_osd);
1109                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1110         }
1111         while (!list_empty(&slow_osds)) {
1112                 osd = list_entry(slow_osds.next, struct ceph_osd,
1113                                  o_keepalive_item);
1114                 list_del_init(&osd->o_keepalive_item);
1115                 ceph_con_keepalive(&osd->o_con);
1116         }
1117
1118         __schedule_osd_timeout(osdc);
1119         mutex_unlock(&osdc->request_mutex);
1120         send_queued(osdc);
1121         up_read(&osdc->map_sem);
1122 }
1123
1124 static void handle_osds_timeout(struct work_struct *work)
1125 {
1126         struct ceph_osd_client *osdc =
1127                 container_of(work, struct ceph_osd_client,
1128                              osds_timeout_work.work);
1129         unsigned long delay =
1130                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1131
1132         dout("osds timeout\n");
1133         down_read(&osdc->map_sem);
1134         remove_old_osds(osdc, 0);
1135         up_read(&osdc->map_sem);
1136
1137         schedule_delayed_work(&osdc->osds_timeout_work,
1138                               round_jiffies_relative(delay));
1139 }
1140
1141 /*
1142  * handle osd op reply.  either call the callback if it is specified,
1143  * or do the completion to wake up the waiting thread.
1144  */
1145 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1146                          struct ceph_connection *con)
1147 {
1148         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1149         struct ceph_osd_request *req;
1150         u64 tid;
1151         int numops, object_len, flags;
1152         s32 result;
1153
1154         tid = le64_to_cpu(msg->hdr.tid);
1155         if (msg->front.iov_len < sizeof(*rhead))
1156                 goto bad;
1157         numops = le32_to_cpu(rhead->num_ops);
1158         object_len = le32_to_cpu(rhead->object_len);
1159         result = le32_to_cpu(rhead->result);
1160         if (msg->front.iov_len != sizeof(*rhead) + object_len +
1161             numops * sizeof(struct ceph_osd_op))
1162                 goto bad;
1163         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1164         /* lookup */
1165         mutex_lock(&osdc->request_mutex);
1166         req = __lookup_request(osdc, tid);
1167         if (req == NULL) {
1168                 dout("handle_reply tid %llu dne\n", tid);
1169                 mutex_unlock(&osdc->request_mutex);
1170                 return;
1171         }
1172         ceph_osdc_get_request(req);
1173         flags = le32_to_cpu(rhead->flags);
1174
1175         /*
1176          * if this connection filled our message, drop our reference now, to
1177          * avoid a (safe but slower) revoke later.
1178          */
1179         if (req->r_con_filling_msg == con && req->r_reply == msg) {
1180                 dout(" dropping con_filling_msg ref %p\n", con);
1181                 req->r_con_filling_msg = NULL;
1182                 ceph_con_put(con);
1183         }
1184
1185         if (!req->r_got_reply) {
1186                 unsigned bytes;
1187
1188                 req->r_result = le32_to_cpu(rhead->result);
1189                 bytes = le32_to_cpu(msg->hdr.data_len);
1190                 dout("handle_reply result %d bytes %d\n", req->r_result,
1191                      bytes);
1192                 if (req->r_result == 0)
1193                         req->r_result = bytes;
1194
1195                 /* in case this is a write and we need to replay, */
1196                 req->r_reassert_version = rhead->reassert_version;
1197
1198                 req->r_got_reply = 1;
1199         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1200                 dout("handle_reply tid %llu dup ack\n", tid);
1201                 mutex_unlock(&osdc->request_mutex);
1202                 goto done;
1203         }
1204
1205         dout("handle_reply tid %llu flags %d\n", tid, flags);
1206
1207         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1208                 __register_linger_request(osdc, req);
1209
1210         /* either this is a read, or we got the safe response */
1211         if (result < 0 ||
1212             (flags & CEPH_OSD_FLAG_ONDISK) ||
1213             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1214                 __unregister_request(osdc, req);
1215
1216         mutex_unlock(&osdc->request_mutex);
1217
1218         if (req->r_callback)
1219                 req->r_callback(req, msg);
1220         else
1221                 complete_all(&req->r_completion);
1222
1223         if (flags & CEPH_OSD_FLAG_ONDISK) {
1224                 if (req->r_safe_callback)
1225                         req->r_safe_callback(req, msg);
1226                 complete_all(&req->r_safe_completion);  /* fsync waiter */
1227         }
1228
1229 done:
1230         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1231         ceph_osdc_put_request(req);
1232         return;
1233
1234 bad:
1235         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1236                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1237                (int)sizeof(*rhead));
1238         ceph_msg_dump(msg);
1239 }
1240
1241 static void reset_changed_osds(struct ceph_osd_client *osdc)
1242 {
1243         struct rb_node *p, *n;
1244
1245         for (p = rb_first(&osdc->osds); p; p = n) {
1246                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1247
1248                 n = rb_next(p);
1249                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1250                     memcmp(&osd->o_con.peer_addr,
1251                            ceph_osd_addr(osdc->osdmap,
1252                                          osd->o_osd),
1253                            sizeof(struct ceph_entity_addr)) != 0)
1254                         __reset_osd(osdc, osd);
1255         }
1256 }
1257
1258 /*
1259  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1260  * no osd, request a new map.
1261  *
1262  * Caller should hold map_sem for read and request_mutex.
1263  */
1264 static void kick_requests(struct ceph_osd_client *osdc)
1265 {
1266         struct ceph_osd_request *req, *nreq;
1267         struct rb_node *p;
1268         int needmap = 0;
1269         int err;
1270
1271         dout("kick_requests\n");
1272         mutex_lock(&osdc->request_mutex);
1273         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1274                 req = rb_entry(p, struct ceph_osd_request, r_node);
1275                 err = __map_request(osdc, req);
1276                 if (err < 0)
1277                         continue;  /* error */
1278                 if (req->r_osd == NULL) {
1279                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1280                         needmap++;  /* request a newer map */
1281                 } else if (err > 0) {
1282                         dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1283                              req->r_osd ? req->r_osd->o_osd : -1);
1284                         if (!req->r_linger)
1285                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1286                 }
1287         }
1288
1289         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1290                                  r_linger_item) {
1291                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1292
1293                 err = __map_request(osdc, req);
1294                 if (err == 0)
1295                         continue;  /* no change and no osd was specified */
1296                 if (err < 0)
1297                         continue;  /* hrm! */
1298                 if (req->r_osd == NULL) {
1299                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1300                         needmap++;  /* request a newer map */
1301                         continue;
1302                 }
1303
1304                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1305                      req->r_osd ? req->r_osd->o_osd : -1);
1306                 __unregister_linger_request(osdc, req);
1307                 __register_request(osdc, req);
1308         }
1309         mutex_unlock(&osdc->request_mutex);
1310
1311         if (needmap) {
1312                 dout("%d requests for down osds, need new map\n", needmap);
1313                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1314         }
1315 }
1316
1317
1318 /*
1319  * Process updated osd map.
1320  *
1321  * The message contains any number of incremental and full maps, normally
1322  * indicating some sort of topology change in the cluster.  Kick requests
1323  * off to different OSDs as needed.
1324  */
1325 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1326 {
1327         void *p, *end, *next;
1328         u32 nr_maps, maplen;
1329         u32 epoch;
1330         struct ceph_osdmap *newmap = NULL, *oldmap;
1331         int err;
1332         struct ceph_fsid fsid;
1333
1334         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1335         p = msg->front.iov_base;
1336         end = p + msg->front.iov_len;
1337
1338         /* verify fsid */
1339         ceph_decode_need(&p, end, sizeof(fsid), bad);
1340         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1341         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1342                 return;
1343
1344         down_write(&osdc->map_sem);
1345
1346         /* incremental maps */
1347         ceph_decode_32_safe(&p, end, nr_maps, bad);
1348         dout(" %d inc maps\n", nr_maps);
1349         while (nr_maps > 0) {
1350                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1351                 epoch = ceph_decode_32(&p);
1352                 maplen = ceph_decode_32(&p);
1353                 ceph_decode_need(&p, end, maplen, bad);
1354                 next = p + maplen;
1355                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1356                         dout("applying incremental map %u len %d\n",
1357                              epoch, maplen);
1358                         newmap = osdmap_apply_incremental(&p, next,
1359                                                           osdc->osdmap,
1360                                                           osdc->client->msgr);
1361                         if (IS_ERR(newmap)) {
1362                                 err = PTR_ERR(newmap);
1363                                 goto bad;
1364                         }
1365                         BUG_ON(!newmap);
1366                         if (newmap != osdc->osdmap) {
1367                                 ceph_osdmap_destroy(osdc->osdmap);
1368                                 osdc->osdmap = newmap;
1369                         }
1370                         kick_requests(osdc);
1371                         reset_changed_osds(osdc);
1372                 } else {
1373                         dout("ignoring incremental map %u len %d\n",
1374                              epoch, maplen);
1375                 }
1376                 p = next;
1377                 nr_maps--;
1378         }
1379         if (newmap)
1380                 goto done;
1381
1382         /* full maps */
1383         ceph_decode_32_safe(&p, end, nr_maps, bad);
1384         dout(" %d full maps\n", nr_maps);
1385         while (nr_maps) {
1386                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1387                 epoch = ceph_decode_32(&p);
1388                 maplen = ceph_decode_32(&p);
1389                 ceph_decode_need(&p, end, maplen, bad);
1390                 if (nr_maps > 1) {
1391                         dout("skipping non-latest full map %u len %d\n",
1392                              epoch, maplen);
1393                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1394                         dout("skipping full map %u len %d, "
1395                              "older than our %u\n", epoch, maplen,
1396                              osdc->osdmap->epoch);
1397                 } else {
1398                         dout("taking full map %u len %d\n", epoch, maplen);
1399                         newmap = osdmap_decode(&p, p+maplen);
1400                         if (IS_ERR(newmap)) {
1401                                 err = PTR_ERR(newmap);
1402                                 goto bad;
1403                         }
1404                         BUG_ON(!newmap);
1405                         oldmap = osdc->osdmap;
1406                         osdc->osdmap = newmap;
1407                         if (oldmap)
1408                                 ceph_osdmap_destroy(oldmap);
1409                         kick_requests(osdc);
1410                 }
1411                 p += maplen;
1412                 nr_maps--;
1413         }
1414
1415 done:
1416         downgrade_write(&osdc->map_sem);
1417         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1418         send_queued(osdc);
1419         up_read(&osdc->map_sem);
1420         wake_up_all(&osdc->client->auth_wq);
1421         return;
1422
1423 bad:
1424         pr_err("osdc handle_map corrupt msg\n");
1425         ceph_msg_dump(msg);
1426         up_write(&osdc->map_sem);
1427         return;
1428 }
1429
1430 /*
1431  * watch/notify callback event infrastructure
1432  *
1433  * These callbacks are used both for watch and notify operations.
1434  */
1435 static void __release_event(struct kref *kref)
1436 {
1437         struct ceph_osd_event *event =
1438                 container_of(kref, struct ceph_osd_event, kref);
1439
1440         dout("__release_event %p\n", event);
1441         kfree(event);
1442 }
1443
1444 static void get_event(struct ceph_osd_event *event)
1445 {
1446         kref_get(&event->kref);
1447 }
1448
1449 void ceph_osdc_put_event(struct ceph_osd_event *event)
1450 {
1451         kref_put(&event->kref, __release_event);
1452 }
1453 EXPORT_SYMBOL(ceph_osdc_put_event);
1454
1455 static void __insert_event(struct ceph_osd_client *osdc,
1456                              struct ceph_osd_event *new)
1457 {
1458         struct rb_node **p = &osdc->event_tree.rb_node;
1459         struct rb_node *parent = NULL;
1460         struct ceph_osd_event *event = NULL;
1461
1462         while (*p) {
1463                 parent = *p;
1464                 event = rb_entry(parent, struct ceph_osd_event, node);
1465                 if (new->cookie < event->cookie)
1466                         p = &(*p)->rb_left;
1467                 else if (new->cookie > event->cookie)
1468                         p = &(*p)->rb_right;
1469                 else
1470                         BUG();
1471         }
1472
1473         rb_link_node(&new->node, parent, p);
1474         rb_insert_color(&new->node, &osdc->event_tree);
1475 }
1476
1477 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1478                                                 u64 cookie)
1479 {
1480         struct rb_node **p = &osdc->event_tree.rb_node;
1481         struct rb_node *parent = NULL;
1482         struct ceph_osd_event *event = NULL;
1483
1484         while (*p) {
1485                 parent = *p;
1486                 event = rb_entry(parent, struct ceph_osd_event, node);
1487                 if (cookie < event->cookie)
1488                         p = &(*p)->rb_left;
1489                 else if (cookie > event->cookie)
1490                         p = &(*p)->rb_right;
1491                 else
1492                         return event;
1493         }
1494         return NULL;
1495 }
1496
1497 static void __remove_event(struct ceph_osd_event *event)
1498 {
1499         struct ceph_osd_client *osdc = event->osdc;
1500
1501         if (!RB_EMPTY_NODE(&event->node)) {
1502                 dout("__remove_event removed %p\n", event);
1503                 rb_erase(&event->node, &osdc->event_tree);
1504                 ceph_osdc_put_event(event);
1505         } else {
1506                 dout("__remove_event didn't remove %p\n", event);
1507         }
1508 }
1509
1510 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1511                            void (*event_cb)(u64, u64, u8, void *),
1512                            int one_shot, void *data,
1513                            struct ceph_osd_event **pevent)
1514 {
1515         struct ceph_osd_event *event;
1516
1517         event = kmalloc(sizeof(*event), GFP_NOIO);
1518         if (!event)
1519                 return -ENOMEM;
1520
1521         dout("create_event %p\n", event);
1522         event->cb = event_cb;
1523         event->one_shot = one_shot;
1524         event->data = data;
1525         event->osdc = osdc;
1526         INIT_LIST_HEAD(&event->osd_node);
1527         kref_init(&event->kref);   /* one ref for us */
1528         kref_get(&event->kref);    /* one ref for the caller */
1529         init_completion(&event->completion);
1530
1531         spin_lock(&osdc->event_lock);
1532         event->cookie = ++osdc->event_count;
1533         __insert_event(osdc, event);
1534         spin_unlock(&osdc->event_lock);
1535
1536         *pevent = event;
1537         return 0;
1538 }
1539 EXPORT_SYMBOL(ceph_osdc_create_event);
1540
1541 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1542 {
1543         struct ceph_osd_client *osdc = event->osdc;
1544
1545         dout("cancel_event %p\n", event);
1546         spin_lock(&osdc->event_lock);
1547         __remove_event(event);
1548         spin_unlock(&osdc->event_lock);
1549         ceph_osdc_put_event(event); /* caller's */
1550 }
1551 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1552
1553
1554 static void do_event_work(struct work_struct *work)
1555 {
1556         struct ceph_osd_event_work *event_work =
1557                 container_of(work, struct ceph_osd_event_work, work);
1558         struct ceph_osd_event *event = event_work->event;
1559         u64 ver = event_work->ver;
1560         u64 notify_id = event_work->notify_id;
1561         u8 opcode = event_work->opcode;
1562
1563         dout("do_event_work completing %p\n", event);
1564         event->cb(ver, notify_id, opcode, event->data);
1565         complete(&event->completion);
1566         dout("do_event_work completed %p\n", event);
1567         ceph_osdc_put_event(event);
1568         kfree(event_work);
1569 }
1570
1571
1572 /*
1573  * Process osd watch notifications
1574  */
1575 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1576 {
1577         void *p, *end;
1578         u8 proto_ver;
1579         u64 cookie, ver, notify_id;
1580         u8 opcode;
1581         struct ceph_osd_event *event;
1582         struct ceph_osd_event_work *event_work;
1583
1584         p = msg->front.iov_base;
1585         end = p + msg->front.iov_len;
1586
1587         ceph_decode_8_safe(&p, end, proto_ver, bad);
1588         ceph_decode_8_safe(&p, end, opcode, bad);
1589         ceph_decode_64_safe(&p, end, cookie, bad);
1590         ceph_decode_64_safe(&p, end, ver, bad);
1591         ceph_decode_64_safe(&p, end, notify_id, bad);
1592
1593         spin_lock(&osdc->event_lock);
1594         event = __find_event(osdc, cookie);
1595         if (event) {
1596                 get_event(event);
1597                 if (event->one_shot)
1598                         __remove_event(event);
1599         }
1600         spin_unlock(&osdc->event_lock);
1601         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1602              cookie, ver, event);
1603         if (event) {
1604                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1605                 if (!event_work) {
1606                         dout("ERROR: could not allocate event_work\n");
1607                         goto done_err;
1608                 }
1609                 INIT_WORK(&event_work->work, do_event_work);
1610                 event_work->event = event;
1611                 event_work->ver = ver;
1612                 event_work->notify_id = notify_id;
1613                 event_work->opcode = opcode;
1614                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1615                         dout("WARNING: failed to queue notify event work\n");
1616                         goto done_err;
1617                 }
1618         }
1619
1620         return;
1621
1622 done_err:
1623         complete(&event->completion);
1624         ceph_osdc_put_event(event);
1625         return;
1626
1627 bad:
1628         pr_err("osdc handle_watch_notify corrupt msg\n");
1629         return;
1630 }
1631
1632 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1633 {
1634         int err;
1635
1636         dout("wait_event %p\n", event);
1637         err = wait_for_completion_interruptible_timeout(&event->completion,
1638                                                         timeout * HZ);
1639         ceph_osdc_put_event(event);
1640         if (err > 0)
1641                 err = 0;
1642         dout("wait_event %p returns %d\n", event, err);
1643         return err;
1644 }
1645 EXPORT_SYMBOL(ceph_osdc_wait_event);
1646
1647 /*
1648  * Register request, send initial attempt.
1649  */
1650 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1651                             struct ceph_osd_request *req,
1652                             bool nofail)
1653 {
1654         int rc = 0;
1655
1656         req->r_request->pages = req->r_pages;
1657         req->r_request->nr_pages = req->r_num_pages;
1658 #ifdef CONFIG_BLOCK
1659         req->r_request->bio = req->r_bio;
1660 #endif
1661         req->r_request->trail = req->r_trail;
1662
1663         register_request(osdc, req);
1664
1665         down_read(&osdc->map_sem);
1666         mutex_lock(&osdc->request_mutex);
1667         /*
1668          * a racing kick_requests() may have sent the message for us
1669          * while we dropped request_mutex above, so only send now if
1670          * the request still han't been touched yet.
1671          */
1672         if (req->r_sent == 0) {
1673                 rc = __map_request(osdc, req);
1674                 if (rc < 0)
1675                         goto out_unlock;
1676                 if (req->r_osd == NULL) {
1677                         dout("send_request %p no up osds in pg\n", req);
1678                         ceph_monc_request_next_osdmap(&osdc->client->monc);
1679                 } else {
1680                         rc = __send_request(osdc, req);
1681                         if (rc) {
1682                                 if (nofail) {
1683                                         dout("osdc_start_request failed send, "
1684                                              " will retry %lld\n", req->r_tid);
1685                                         rc = 0;
1686                                 } else {
1687                                         __unregister_request(osdc, req);
1688                                 }
1689                         }
1690                 }
1691         }
1692
1693 out_unlock:
1694         mutex_unlock(&osdc->request_mutex);
1695         up_read(&osdc->map_sem);
1696         return rc;
1697 }
1698 EXPORT_SYMBOL(ceph_osdc_start_request);
1699
1700 /*
1701  * wait for a request to complete
1702  */
1703 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1704                            struct ceph_osd_request *req)
1705 {
1706         int rc;
1707
1708         rc = wait_for_completion_interruptible(&req->r_completion);
1709         if (rc < 0) {
1710                 mutex_lock(&osdc->request_mutex);
1711                 __cancel_request(req);
1712                 __unregister_request(osdc, req);
1713                 mutex_unlock(&osdc->request_mutex);
1714                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1715                 return rc;
1716         }
1717
1718         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1719         return req->r_result;
1720 }
1721 EXPORT_SYMBOL(ceph_osdc_wait_request);
1722
1723 /*
1724  * sync - wait for all in-flight requests to flush.  avoid starvation.
1725  */
1726 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1727 {
1728         struct ceph_osd_request *req;
1729         u64 last_tid, next_tid = 0;
1730
1731         mutex_lock(&osdc->request_mutex);
1732         last_tid = osdc->last_tid;
1733         while (1) {
1734                 req = __lookup_request_ge(osdc, next_tid);
1735                 if (!req)
1736                         break;
1737                 if (req->r_tid > last_tid)
1738                         break;
1739
1740                 next_tid = req->r_tid + 1;
1741                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1742                         continue;
1743
1744                 ceph_osdc_get_request(req);
1745                 mutex_unlock(&osdc->request_mutex);
1746                 dout("sync waiting on tid %llu (last is %llu)\n",
1747                      req->r_tid, last_tid);
1748                 wait_for_completion(&req->r_safe_completion);
1749                 mutex_lock(&osdc->request_mutex);
1750                 ceph_osdc_put_request(req);
1751         }
1752         mutex_unlock(&osdc->request_mutex);
1753         dout("sync done (thru tid %llu)\n", last_tid);
1754 }
1755 EXPORT_SYMBOL(ceph_osdc_sync);
1756
1757 /*
1758  * init, shutdown
1759  */
1760 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1761 {
1762         int err;
1763
1764         dout("init\n");
1765         osdc->client = client;
1766         osdc->osdmap = NULL;
1767         init_rwsem(&osdc->map_sem);
1768         init_completion(&osdc->map_waiters);
1769         osdc->last_requested_map = 0;
1770         mutex_init(&osdc->request_mutex);
1771         osdc->last_tid = 0;
1772         osdc->osds = RB_ROOT;
1773         INIT_LIST_HEAD(&osdc->osd_lru);
1774         osdc->requests = RB_ROOT;
1775         INIT_LIST_HEAD(&osdc->req_lru);
1776         INIT_LIST_HEAD(&osdc->req_unsent);
1777         INIT_LIST_HEAD(&osdc->req_notarget);
1778         INIT_LIST_HEAD(&osdc->req_linger);
1779         osdc->num_requests = 0;
1780         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1781         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1782         spin_lock_init(&osdc->event_lock);
1783         osdc->event_tree = RB_ROOT;
1784         osdc->event_count = 0;
1785
1786         schedule_delayed_work(&osdc->osds_timeout_work,
1787            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1788
1789         err = -ENOMEM;
1790         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1791                                         sizeof(struct ceph_osd_request));
1792         if (!osdc->req_mempool)
1793                 goto out;
1794
1795         err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1796                                 "osd_op");
1797         if (err < 0)
1798                 goto out_mempool;
1799         err = ceph_msgpool_init(&osdc->msgpool_op_reply,
1800                                 OSD_OPREPLY_FRONT_LEN, 10, true,
1801                                 "osd_op_reply");
1802         if (err < 0)
1803                 goto out_msgpool;
1804
1805         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1806         if (IS_ERR(osdc->notify_wq)) {
1807                 err = PTR_ERR(osdc->notify_wq);
1808                 osdc->notify_wq = NULL;
1809                 goto out_msgpool;
1810         }
1811         return 0;
1812
1813 out_msgpool:
1814         ceph_msgpool_destroy(&osdc->msgpool_op);
1815 out_mempool:
1816         mempool_destroy(osdc->req_mempool);
1817 out:
1818         return err;
1819 }
1820 EXPORT_SYMBOL(ceph_osdc_init);
1821
1822 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1823 {
1824         flush_workqueue(osdc->notify_wq);
1825         destroy_workqueue(osdc->notify_wq);
1826         cancel_delayed_work_sync(&osdc->timeout_work);
1827         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1828         if (osdc->osdmap) {
1829                 ceph_osdmap_destroy(osdc->osdmap);
1830                 osdc->osdmap = NULL;
1831         }
1832         remove_old_osds(osdc, 1);
1833         WARN_ON(!RB_EMPTY_ROOT(&osdc->osds));
1834         mempool_destroy(osdc->req_mempool);
1835         ceph_msgpool_destroy(&osdc->msgpool_op);
1836         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1837 }
1838 EXPORT_SYMBOL(ceph_osdc_stop);
1839
1840 /*
1841  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1842  * *plen.  Return number of bytes read, or error.
1843  */
1844 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1845                         struct ceph_vino vino, struct ceph_file_layout *layout,
1846                         u64 off, u64 *plen,
1847                         u32 truncate_seq, u64 truncate_size,
1848                         struct page **pages, int num_pages, int page_align)
1849 {
1850         struct ceph_osd_request *req;
1851         int rc = 0;
1852
1853         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1854              vino.snap, off, *plen);
1855         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1856                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1857                                     NULL, 0, truncate_seq, truncate_size, NULL,
1858                                     false, 1, page_align);
1859         if (!req)
1860                 return -ENOMEM;
1861
1862         /* it may be a short read due to an object boundary */
1863         req->r_pages = pages;
1864
1865         dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
1866              off, *plen, req->r_num_pages, page_align);
1867
1868         rc = ceph_osdc_start_request(osdc, req, false);
1869         if (!rc)
1870                 rc = ceph_osdc_wait_request(osdc, req);
1871
1872         ceph_osdc_put_request(req);
1873         dout("readpages result %d\n", rc);
1874         return rc;
1875 }
1876 EXPORT_SYMBOL(ceph_osdc_readpages);
1877
1878 /*
1879  * do a synchronous write on N pages
1880  */
1881 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1882                          struct ceph_file_layout *layout,
1883                          struct ceph_snap_context *snapc,
1884                          u64 off, u64 len,
1885                          u32 truncate_seq, u64 truncate_size,
1886                          struct timespec *mtime,
1887                          struct page **pages, int num_pages,
1888                          int flags, int do_sync, bool nofail)
1889 {
1890         struct ceph_osd_request *req;
1891         int rc = 0;
1892         int page_align = off & ~PAGE_MASK;
1893
1894         BUG_ON(vino.snap != CEPH_NOSNAP);
1895         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1896                                     CEPH_OSD_OP_WRITE,
1897                                     flags | CEPH_OSD_FLAG_ONDISK |
1898                                             CEPH_OSD_FLAG_WRITE,
1899                                     snapc, do_sync,
1900                                     truncate_seq, truncate_size, mtime,
1901                                     nofail, 1, page_align);
1902         if (!req)
1903                 return -ENOMEM;
1904
1905         /* it may be a short write due to an object boundary */
1906         req->r_pages = pages;
1907         dout("writepages %llu~%llu (%d pages)\n", off, len,
1908              req->r_num_pages);
1909
1910         rc = ceph_osdc_start_request(osdc, req, nofail);
1911         if (!rc)
1912                 rc = ceph_osdc_wait_request(osdc, req);
1913
1914         ceph_osdc_put_request(req);
1915         if (rc == 0)
1916                 rc = len;
1917         dout("writepages result %d\n", rc);
1918         return rc;
1919 }
1920 EXPORT_SYMBOL(ceph_osdc_writepages);
1921
1922 /*
1923  * handle incoming message
1924  */
1925 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1926 {
1927         struct ceph_osd *osd = con->private;
1928         struct ceph_osd_client *osdc;
1929         int type = le16_to_cpu(msg->hdr.type);
1930
1931         if (!osd)
1932                 goto out;
1933         osdc = osd->o_osdc;
1934
1935         switch (type) {
1936         case CEPH_MSG_OSD_MAP:
1937                 ceph_osdc_handle_map(osdc, msg);
1938                 break;
1939         case CEPH_MSG_OSD_OPREPLY:
1940                 handle_reply(osdc, msg, con);
1941                 break;
1942         case CEPH_MSG_WATCH_NOTIFY:
1943                 handle_watch_notify(osdc, msg);
1944                 break;
1945
1946         default:
1947                 pr_err("received unknown message type %d %s\n", type,
1948                        ceph_msg_type_name(type));
1949         }
1950 out:
1951         ceph_msg_put(msg);
1952 }
1953
1954 /*
1955  * lookup and return message for incoming reply.  set up reply message
1956  * pages.
1957  */
1958 static struct ceph_msg *get_reply(struct ceph_connection *con,
1959                                   struct ceph_msg_header *hdr,
1960                                   int *skip)
1961 {
1962         struct ceph_osd *osd = con->private;
1963         struct ceph_osd_client *osdc = osd->o_osdc;
1964         struct ceph_msg *m;
1965         struct ceph_osd_request *req;
1966         int front = le32_to_cpu(hdr->front_len);
1967         int data_len = le32_to_cpu(hdr->data_len);
1968         u64 tid;
1969
1970         tid = le64_to_cpu(hdr->tid);
1971         mutex_lock(&osdc->request_mutex);
1972         req = __lookup_request(osdc, tid);
1973         if (!req) {
1974                 *skip = 1;
1975                 m = NULL;
1976                 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
1977                         osd->o_osd);
1978                 goto out;
1979         }
1980
1981         if (req->r_con_filling_msg) {
1982                 dout("get_reply revoking msg %p from old con %p\n",
1983                      req->r_reply, req->r_con_filling_msg);
1984                 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
1985                 ceph_con_put(req->r_con_filling_msg);
1986                 req->r_con_filling_msg = NULL;
1987         }
1988
1989         if (front > req->r_reply->front.iov_len) {
1990                 pr_warning("get_reply front %d > preallocated %d\n",
1991                            front, (int)req->r_reply->front.iov_len);
1992                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS);
1993                 if (!m)
1994                         goto out;
1995                 ceph_msg_put(req->r_reply);
1996                 req->r_reply = m;
1997         }
1998         m = ceph_msg_get(req->r_reply);
1999
2000         if (data_len > 0) {
2001                 int want = calc_pages_for(req->r_page_alignment, data_len);
2002
2003                 if (unlikely(req->r_num_pages < want)) {
2004                         pr_warning("tid %lld reply %d > expected %d pages\n",
2005                                    tid, want, m->nr_pages);
2006                         *skip = 1;
2007                         ceph_msg_put(m);
2008                         m = NULL;
2009                         goto out;
2010                 }
2011                 m->pages = req->r_pages;
2012                 m->nr_pages = req->r_num_pages;
2013                 m->page_alignment = req->r_page_alignment;
2014 #ifdef CONFIG_BLOCK
2015                 m->bio = req->r_bio;
2016 #endif
2017         }
2018         *skip = 0;
2019         req->r_con_filling_msg = ceph_con_get(con);
2020         dout("get_reply tid %lld %p\n", tid, m);
2021
2022 out:
2023         mutex_unlock(&osdc->request_mutex);
2024         return m;
2025
2026 }
2027
2028 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2029                                   struct ceph_msg_header *hdr,
2030                                   int *skip)
2031 {
2032         struct ceph_osd *osd = con->private;
2033         int type = le16_to_cpu(hdr->type);
2034         int front = le32_to_cpu(hdr->front_len);
2035
2036         switch (type) {
2037         case CEPH_MSG_OSD_MAP:
2038         case CEPH_MSG_WATCH_NOTIFY:
2039                 return ceph_msg_new(type, front, GFP_NOFS);
2040         case CEPH_MSG_OSD_OPREPLY:
2041                 return get_reply(con, hdr, skip);
2042         default:
2043                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2044                         osd->o_osd);
2045                 *skip = 1;
2046                 return NULL;
2047         }
2048 }
2049
2050 /*
2051  * Wrappers to refcount containing ceph_osd struct
2052  */
2053 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2054 {
2055         struct ceph_osd *osd = con->private;
2056         if (get_osd(osd))
2057                 return con;
2058         return NULL;
2059 }
2060
2061 static void put_osd_con(struct ceph_connection *con)
2062 {
2063         struct ceph_osd *osd = con->private;
2064         put_osd(osd);
2065 }
2066
2067 /*
2068  * authentication
2069  */
2070 static int get_authorizer(struct ceph_connection *con,
2071                           void **buf, int *len, int *proto,
2072                           void **reply_buf, int *reply_len, int force_new)
2073 {
2074         struct ceph_osd *o = con->private;
2075         struct ceph_osd_client *osdc = o->o_osdc;
2076         struct ceph_auth_client *ac = osdc->client->monc.auth;
2077         int ret = 0;
2078
2079         if (force_new && o->o_authorizer) {
2080                 ac->ops->destroy_authorizer(ac, o->o_authorizer);
2081                 o->o_authorizer = NULL;
2082         }
2083         if (o->o_authorizer == NULL) {
2084                 ret = ac->ops->create_authorizer(
2085                         ac, CEPH_ENTITY_TYPE_OSD,
2086                         &o->o_authorizer,
2087                         &o->o_authorizer_buf,
2088                         &o->o_authorizer_buf_len,
2089                         &o->o_authorizer_reply_buf,
2090                         &o->o_authorizer_reply_buf_len);
2091                 if (ret)
2092                         return ret;
2093         }
2094
2095         *proto = ac->protocol;
2096         *buf = o->o_authorizer_buf;
2097         *len = o->o_authorizer_buf_len;
2098         *reply_buf = o->o_authorizer_reply_buf;
2099         *reply_len = o->o_authorizer_reply_buf_len;
2100         return 0;
2101 }
2102
2103
2104 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2105 {
2106         struct ceph_osd *o = con->private;
2107         struct ceph_osd_client *osdc = o->o_osdc;
2108         struct ceph_auth_client *ac = osdc->client->monc.auth;
2109
2110         return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len);
2111 }
2112
2113 static int invalidate_authorizer(struct ceph_connection *con)
2114 {
2115         struct ceph_osd *o = con->private;
2116         struct ceph_osd_client *osdc = o->o_osdc;
2117         struct ceph_auth_client *ac = osdc->client->monc.auth;
2118
2119         if (ac->ops->invalidate_authorizer)
2120                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2121
2122         return ceph_monc_validate_auth(&osdc->client->monc);
2123 }
2124
2125 static const struct ceph_connection_operations osd_con_ops = {
2126         .get = get_osd_con,
2127         .put = put_osd_con,
2128         .dispatch = dispatch,
2129         .get_authorizer = get_authorizer,
2130         .verify_authorizer_reply = verify_authorizer_reply,
2131         .invalidate_authorizer = invalidate_authorizer,
2132         .alloc_msg = alloc_msg,
2133         .fault = osd_reset,
2134 };