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 void __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 int 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         int r;
  66
  67         reqhead->snapid = cpu_to_le64(snapid);
  68
  69         /* object extent? */
  70         r = ceph_calc_file_object_mapping(layout, off, plen, bno,
  71                                           &objoff, &objlen);
  72         if (r < 0)
  73                 return r;
  74         if (*plen < orig_len)
  75                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  76                      orig_len - *plen, off, *plen);
  77
  78         if (op_has_extent(op->op)) {
  79                 op->extent.offset = objoff;
  80                 op->extent.length = objlen;
  81         }
  82         req->r_num_pages = calc_pages_for(off, *plen);
  83         req->r_page_alignment = off & ~PAGE_MASK;
  84         if (op->op == CEPH_OSD_OP_WRITE)
  85                 op->payload_len = *plen;
  86
  87         dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
  88              *bno, objoff, objlen, req->r_num_pages);
  89         return 0;
  90 }
  91 EXPORT_SYMBOL(ceph_calc_raw_layout);
  92
  93 /*
  94  * Implement client access to distributed object storage cluster.
  95  *
  96  * All data objects are stored within a cluster/cloud of OSDs, or
  97  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  98  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  99  * remote daemons serving up and coordinating consistent and safe
 100  * access to storage.
 101  *
 102  * Cluster membership and the mapping of data objects onto storage devices
 103  * are described by the osd map.
 104  *
 105  * We keep track of pending OSD requests (read, write), resubmit
 106  * requests to different OSDs when the cluster topology/data layout
 107  * change, or retry the affected requests when the communications
 108  * channel with an OSD is reset.
 109  */
 110
 111 /*
 112  * calculate the mapping of a file extent onto an object, and fill out the
 113  * request accordingly.  shorten extent as necessary if it crosses an
 114  * object boundary.
 115  *
 116  * fill osd op in request message.
 117  */
 118 static int calc_layout(struct ceph_osd_client *osdc,
 119                        struct ceph_vino vino,
 120                        struct ceph_file_layout *layout,
 121                        u64 off, u64 *plen,
 122                        struct ceph_osd_request *req,
 123                        struct ceph_osd_req_op *op)
 124 {
 125         u64 bno;
 126         int r;
 127
 128         r = ceph_calc_raw_layout(osdc, layout, vino.snap, off,
 129                                  plen, &bno, req, op);
 130         if (r < 0)
 131                 return r;
 132
 133         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
 134         req->r_oid_len = strlen(req->r_oid);
 135
 136         return r;
 137 }
 138
 139 /*
 140  * requests
 141  */
 142 void ceph_osdc_release_request(struct kref *kref)
 143 {
 144         struct ceph_osd_request *req = container_of(kref,
 145                                                     struct ceph_osd_request,
 146                                                     r_kref);
 147
 148         if (req->r_request)
 149                 ceph_msg_put(req->r_request);
 150         if (req->r_con_filling_msg) {
 151                 dout("%s revoking pages %p from con %p\n", __func__,
 152                      req->r_pages, req->r_con_filling_msg);
 153                 ceph_msg_revoke_incoming(req->r_reply);
 154                 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
 155         }
 156         if (req->r_reply)
 157                 ceph_msg_put(req->r_reply);
 158         if (req->r_own_pages)
 159                 ceph_release_page_vector(req->r_pages,
 160                                          req->r_num_pages);
 161 #ifdef CONFIG_BLOCK
 162         if (req->r_bio)
 163                 bio_put(req->r_bio);
 164 #endif
 165         ceph_put_snap_context(req->r_snapc);
 166         if (req->r_trail) {
 167                 ceph_pagelist_release(req->r_trail);
 168                 kfree(req->r_trail);
 169         }
 170         if (req->r_mempool)
 171                 mempool_free(req, req->r_osdc->req_mempool);
 172         else
 173                 kfree(req);
 174 }
 175 EXPORT_SYMBOL(ceph_osdc_release_request);
 176
 177 static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
 178 {
 179         int i = 0;
 180
 181         if (needs_trail)
 182                 *needs_trail = 0;
 183         while (ops[i].op) {
 184                 if (needs_trail && op_needs_trail(ops[i].op))
 185                         *needs_trail = 1;
 186                 i++;
 187         }
 188
 189         return i;
 190 }
 191
 192 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 193                                                int flags,
 194                                                struct ceph_snap_context *snapc,
 195                                                struct ceph_osd_req_op *ops,
 196                                                bool use_mempool,
 197                                                gfp_t gfp_flags,
 198                                                struct page **pages,
 199                                                struct bio *bio)
 200 {
 201         struct ceph_osd_request *req;
 202         struct ceph_msg *msg;
 203         int needs_trail;
 204         int num_op = get_num_ops(ops, &needs_trail);
 205         size_t msg_size = sizeof(struct ceph_osd_request_head);
 206
 207         msg_size += num_op*sizeof(struct ceph_osd_op);
 208
 209         if (use_mempool) {
 210                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 211                 memset(req, 0, sizeof(*req));
 212         } else {
 213                 req = kzalloc(sizeof(*req), gfp_flags);
 214         }
 215         if (req == NULL)
 216                 return NULL;
 217
 218         req->r_osdc = osdc;
 219         req->r_mempool = use_mempool;
 220
 221         kref_init(&req->r_kref);
 222         init_completion(&req->r_completion);
 223         init_completion(&req->r_safe_completion);
 224         rb_init_node(&req->r_node);
 225         INIT_LIST_HEAD(&req->r_unsafe_item);
 226         INIT_LIST_HEAD(&req->r_linger_item);
 227         INIT_LIST_HEAD(&req->r_linger_osd);
 228         INIT_LIST_HEAD(&req->r_req_lru_item);
 229         INIT_LIST_HEAD(&req->r_osd_item);
 230
 231         req->r_flags = flags;
 232
 233         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
 234
 235         /* create reply message */
 236         if (use_mempool)
 237                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 238         else
 239                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 240                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 241         if (!msg) {
 242                 ceph_osdc_put_request(req);
 243                 return NULL;
 244         }
 245         req->r_reply = msg;
 246
 247         /* allocate space for the trailing data */
 248         if (needs_trail) {
 249                 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
 250                 if (!req->r_trail) {
 251                         ceph_osdc_put_request(req);
 252                         return NULL;
 253                 }
 254                 ceph_pagelist_init(req->r_trail);
 255         }
 256
 257         /* create request message; allow space for oid */
 258         msg_size += MAX_OBJ_NAME_SIZE;
 259         if (snapc)
 260                 msg_size += sizeof(u64) * snapc->num_snaps;
 261         if (use_mempool)
 262                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 263         else
 264                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 265         if (!msg) {
 266                 ceph_osdc_put_request(req);
 267                 return NULL;
 268         }
 269
 270         memset(msg->front.iov_base, 0, msg->front.iov_len);
 271
 272         req->r_request = msg;
 273         req->r_pages = pages;
 274 #ifdef CONFIG_BLOCK
 275         if (bio) {
 276                 req->r_bio = bio;
 277                 bio_get(req->r_bio);
 278         }
 279 #endif
 280
 281         return req;
 282 }
 283 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 284
 285 static void osd_req_encode_op(struct ceph_osd_request *req,
 286                               struct ceph_osd_op *dst,
 287                               struct ceph_osd_req_op *src)
 288 {
 289         dst->op = cpu_to_le16(src->op);
 290
 291         switch (src->op) {
 292         case CEPH_OSD_OP_READ:
 293         case CEPH_OSD_OP_WRITE:
 294                 dst->extent.offset =
 295                         cpu_to_le64(src->extent.offset);
 296                 dst->extent.length =
 297                         cpu_to_le64(src->extent.length);
 298                 dst->extent.truncate_size =
 299                         cpu_to_le64(src->extent.truncate_size);
 300                 dst->extent.truncate_seq =
 301                         cpu_to_le32(src->extent.truncate_seq);
 302                 break;
 303
 304         case CEPH_OSD_OP_GETXATTR:
 305         case CEPH_OSD_OP_SETXATTR:
 306         case CEPH_OSD_OP_CMPXATTR:
 307                 BUG_ON(!req->r_trail);
 308
 309                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 310                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 311                 dst->xattr.cmp_op = src->xattr.cmp_op;
 312                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
 313                 ceph_pagelist_append(req->r_trail, src->xattr.name,
 314                                      src->xattr.name_len);
 315                 ceph_pagelist_append(req->r_trail, src->xattr.val,
 316                                      src->xattr.value_len);
 317                 break;
 318         case CEPH_OSD_OP_CALL:
 319                 BUG_ON(!req->r_trail);
 320
 321                 dst->cls.class_len = src->cls.class_len;
 322                 dst->cls.method_len = src->cls.method_len;
 323                 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
 324
 325                 ceph_pagelist_append(req->r_trail, src->cls.class_name,
 326                                      src->cls.class_len);
 327                 ceph_pagelist_append(req->r_trail, src->cls.method_name,
 328                                      src->cls.method_len);
 329                 ceph_pagelist_append(req->r_trail, src->cls.indata,
 330                                      src->cls.indata_len);
 331                 break;
 332         case CEPH_OSD_OP_ROLLBACK:
 333                 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
 334                 break;
 335         case CEPH_OSD_OP_STARTSYNC:
 336                 break;
 337         case CEPH_OSD_OP_NOTIFY:
 338                 {
 339                         __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
 340                         __le32 timeout = cpu_to_le32(src->watch.timeout);
 341
 342                         BUG_ON(!req->r_trail);
 343
 344                         ceph_pagelist_append(req->r_trail,
 345                                                 &prot_ver, sizeof(prot_ver));
 346                         ceph_pagelist_append(req->r_trail,
 347                                                 &timeout, sizeof(timeout));
 348                 }
 349         case CEPH_OSD_OP_NOTIFY_ACK:
 350         case CEPH_OSD_OP_WATCH:
 351                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 352                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 353                 dst->watch.flag = src->watch.flag;
 354                 break;
 355         default:
 356                 pr_err("unrecognized osd opcode %d\n", dst->op);
 357                 WARN_ON(1);
 358                 break;
 359         }
 360         dst->payload_len = cpu_to_le32(src->payload_len);
 361 }
 362
 363 /*
 364  * build new request AND message
 365  *
 366  */
 367 void ceph_osdc_build_request(struct ceph_osd_request *req,
 368                              u64 off, u64 *plen,
 369                              struct ceph_osd_req_op *src_ops,
 370                              struct ceph_snap_context *snapc,
 371                              struct timespec *mtime,
 372                              const char *oid,
 373                              int oid_len)
 374 {
 375         struct ceph_msg *msg = req->r_request;
 376         struct ceph_osd_request_head *head;
 377         struct ceph_osd_req_op *src_op;
 378         struct ceph_osd_op *op;
 379         void *p;
 380         int num_op = get_num_ops(src_ops, NULL);
 381         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 382         int flags = req->r_flags;
 383         u64 data_len = 0;
 384         int i;
 385
 386         head = msg->front.iov_base;
 387         op = (void *)(head + 1);
 388         p = (void *)(op + num_op);
 389
 390         req->r_snapc = ceph_get_snap_context(snapc);
 391
 392         head->client_inc = cpu_to_le32(1); /* always, for now. */
 393         head->flags = cpu_to_le32(flags);
 394         if (flags & CEPH_OSD_FLAG_WRITE)
 395                 ceph_encode_timespec(&head->mtime, mtime);
 396         head->num_ops = cpu_to_le16(num_op);
 397
 398
 399         /* fill in oid */
 400         head->object_len = cpu_to_le32(oid_len);
 401         memcpy(p, oid, oid_len);
 402         p += oid_len;
 403
 404         src_op = src_ops;
 405         while (src_op->op) {
 406                 osd_req_encode_op(req, op, src_op);
 407                 src_op++;
 408                 op++;
 409         }
 410
 411         if (req->r_trail)
 412                 data_len += req->r_trail->length;
 413
 414         if (snapc) {
 415                 head->snap_seq = cpu_to_le64(snapc->seq);
 416                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
 417                 for (i = 0; i < snapc->num_snaps; i++) {
 418                         put_unaligned_le64(snapc->snaps[i], p);
 419                         p += sizeof(u64);
 420                 }
 421         }
 422
 423         if (flags & CEPH_OSD_FLAG_WRITE) {
 424                 req->r_request->hdr.data_off = cpu_to_le16(off);
 425                 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
 426         } else if (data_len) {
 427                 req->r_request->hdr.data_off = 0;
 428                 req->r_request->hdr.data_len = cpu_to_le32(data_len);
 429         }
 430
 431         req->r_request->page_alignment = req->r_page_alignment;
 432
 433         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
 434         msg_size = p - msg->front.iov_base;
 435         msg->front.iov_len = msg_size;
 436         msg->hdr.front_len = cpu_to_le32(msg_size);
 437         return;
 438 }
 439 EXPORT_SYMBOL(ceph_osdc_build_request);
 440
 441 /*
 442  * build new request AND message, calculate layout, and adjust file
 443  * extent as needed.
 444  *
 445  * if the file was recently truncated, we include information about its
 446  * old and new size so that the object can be updated appropriately.  (we
 447  * avoid synchronously deleting truncated objects because it's slow.)
 448  *
 449  * if @do_sync, include a 'startsync' command so that the osd will flush
 450  * data quickly.
 451  */
 452 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 453                                                struct ceph_file_layout *layout,
 454                                                struct ceph_vino vino,
 455                                                u64 off, u64 *plen,
 456                                                int opcode, int flags,
 457                                                struct ceph_snap_context *snapc,
 458                                                int do_sync,
 459                                                u32 truncate_seq,
 460                                                u64 truncate_size,
 461                                                struct timespec *mtime,
 462                                                bool use_mempool, int num_reply,
 463                                                int page_align)
 464 {
 465         struct ceph_osd_req_op ops[3];
 466         struct ceph_osd_request *req;
 467         int r;
 468
 469         ops[0].op = opcode;
 470         ops[0].extent.truncate_seq = truncate_seq;
 471         ops[0].extent.truncate_size = truncate_size;
 472         ops[0].payload_len = 0;
 473
 474         if (do_sync) {
 475                 ops[1].op = CEPH_OSD_OP_STARTSYNC;
 476                 ops[1].payload_len = 0;
 477                 ops[2].op = 0;
 478         } else
 479                 ops[1].op = 0;
 480
 481         req = ceph_osdc_alloc_request(osdc, flags,
 482                                          snapc, ops,
 483                                          use_mempool,
 484                                          GFP_NOFS, NULL, NULL);
 485         if (!req)
 486                 return ERR_PTR(-ENOMEM);
 487
 488         /* calculate max write size */
 489         r = calc_layout(osdc, vino, layout, off, plen, req, ops);
 490         if (r < 0)
 491                 return ERR_PTR(r);
 492         req->r_file_layout = *layout;  /* keep a copy */
 493
 494         /* in case it differs from natural (file) alignment that
 495            calc_layout filled in for us */
 496         req->r_num_pages = calc_pages_for(page_align, *plen);
 497         req->r_page_alignment = page_align;
 498
 499         ceph_osdc_build_request(req, off, plen, ops,
 500                                 snapc,
 501                                 mtime,
 502                                 req->r_oid, req->r_oid_len);
 503
 504         return req;
 505 }
 506 EXPORT_SYMBOL(ceph_osdc_new_request);
 507
 508 /*
 509  * We keep osd requests in an rbtree, sorted by ->r_tid.
 510  */
 511 static void __insert_request(struct ceph_osd_client *osdc,
 512                              struct ceph_osd_request *new)
 513 {
 514         struct rb_node **p = &osdc->requests.rb_node;
 515         struct rb_node *parent = NULL;
 516         struct ceph_osd_request *req = NULL;
 517
 518         while (*p) {
 519                 parent = *p;
 520                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 521                 if (new->r_tid < req->r_tid)
 522                         p = &(*p)->rb_left;
 523                 else if (new->r_tid > req->r_tid)
 524                         p = &(*p)->rb_right;
 525                 else
 526                         BUG();
 527         }
 528
 529         rb_link_node(&new->r_node, parent, p);
 530         rb_insert_color(&new->r_node, &osdc->requests);
 531 }
 532
 533 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 534                                                  u64 tid)
 535 {
 536         struct ceph_osd_request *req;
 537         struct rb_node *n = osdc->requests.rb_node;
 538
 539         while (n) {
 540                 req = rb_entry(n, struct ceph_osd_request, r_node);
 541                 if (tid < req->r_tid)
 542                         n = n->rb_left;
 543                 else if (tid > req->r_tid)
 544                         n = n->rb_right;
 545                 else
 546                         return req;
 547         }
 548         return NULL;
 549 }
 550
 551 static struct ceph_osd_request *
 552 __lookup_request_ge(struct ceph_osd_client *osdc,
 553                     u64 tid)
 554 {
 555         struct ceph_osd_request *req;
 556         struct rb_node *n = osdc->requests.rb_node;
 557
 558         while (n) {
 559                 req = rb_entry(n, struct ceph_osd_request, r_node);
 560                 if (tid < req->r_tid) {
 561                         if (!n->rb_left)
 562                                 return req;
 563                         n = n->rb_left;
 564                 } else if (tid > req->r_tid) {
 565                         n = n->rb_right;
 566                 } else {
 567                         return req;
 568                 }
 569         }
 570         return NULL;
 571 }
 572
 573 /*
 574  * Resubmit requests pending on the given osd.
 575  */
 576 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 577                                 struct ceph_osd *osd)
 578 {
 579         struct ceph_osd_request *req, *nreq;
 580         int err;
 581
 582         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 583         err = __reset_osd(osdc, osd);
 584         if (err == -EAGAIN)
 585                 return;
 586
 587         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 588                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 589                 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
 590                      osd->o_osd);
 591                 if (!req->r_linger)
 592                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 593         }
 594
 595         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 596                                  r_linger_osd) {
 597                 /*
 598                  * reregister request prior to unregistering linger so
 599                  * that r_osd is preserved.
 600                  */
 601                 BUG_ON(!list_empty(&req->r_req_lru_item));
 602                 __register_request(osdc, req);
 603                 list_add(&req->r_req_lru_item, &osdc->req_unsent);
 604                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 605                 __unregister_linger_request(osdc, req);
 606                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 607                      osd->o_osd);
 608         }
 609 }
 610
 611 static void kick_osd_requests(struct ceph_osd_client *osdc,
 612                               struct ceph_osd *kickosd)
 613 {
 614         mutex_lock(&osdc->request_mutex);
 615         __kick_osd_requests(osdc, kickosd);
 616         mutex_unlock(&osdc->request_mutex);
 617 }
 618
 619 /*
 620  * If the osd connection drops, we need to resubmit all requests.
 621  */
 622 static void osd_reset(struct ceph_connection *con)
 623 {
 624         struct ceph_osd *osd = con->private;
 625         struct ceph_osd_client *osdc;
 626
 627         if (!osd)
 628                 return;
 629         dout("osd_reset osd%d\n", osd->o_osd);
 630         osdc = osd->o_osdc;
 631         down_read(&osdc->map_sem);
 632         kick_osd_requests(osdc, osd);
 633         send_queued(osdc);
 634         up_read(&osdc->map_sem);
 635 }
 636
 637 /*
 638  * Track open sessions with osds.
 639  */
 640 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 641 {
 642         struct ceph_osd *osd;
 643
 644         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 645         if (!osd)
 646                 return NULL;
 647
 648         atomic_set(&osd->o_ref, 1);
 649         osd->o_osdc = osdc;
 650         osd->o_osd = onum;
 651         INIT_LIST_HEAD(&osd->o_requests);
 652         INIT_LIST_HEAD(&osd->o_linger_requests);
 653         INIT_LIST_HEAD(&osd->o_osd_lru);
 654         osd->o_incarnation = 1;
 655
 656         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
 657
 658         INIT_LIST_HEAD(&osd->o_keepalive_item);
 659         return osd;
 660 }
 661
 662 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 663 {
 664         if (atomic_inc_not_zero(&osd->o_ref)) {
 665                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 666                      atomic_read(&osd->o_ref));
 667                 return osd;
 668         } else {
 669                 dout("get_osd %p FAIL\n", osd);
 670                 return NULL;
 671         }
 672 }
 673
 674 static void put_osd(struct ceph_osd *osd)
 675 {
 676         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 677              atomic_read(&osd->o_ref) - 1);
 678         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
 679                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 680
 681                 if (ac->ops && ac->ops->destroy_authorizer)
 682                         ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
 683                 kfree(osd);
 684         }
 685 }
 686
 687 /*
 688  * remove an osd from our map
 689  */
 690 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 691 {
 692         dout("__remove_osd %p\n", osd);
 693         BUG_ON(!list_empty(&osd->o_requests));
 694         rb_erase(&osd->o_node, &osdc->osds);
 695         list_del_init(&osd->o_osd_lru);
 696         ceph_con_close(&osd->o_con);
 697         put_osd(osd);
 698 }
 699
 700 static void remove_all_osds(struct ceph_osd_client *osdc)
 701 {
 702         dout("%s %p\n", __func__, osdc);
 703         mutex_lock(&osdc->request_mutex);
 704         while (!RB_EMPTY_ROOT(&osdc->osds)) {
 705                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
 706                                                 struct ceph_osd, o_node);
 707                 __remove_osd(osdc, osd);
 708         }
 709         mutex_unlock(&osdc->request_mutex);
 710 }
 711
 712 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 713                               struct ceph_osd *osd)
 714 {
 715         dout("__move_osd_to_lru %p\n", osd);
 716         BUG_ON(!list_empty(&osd->o_osd_lru));
 717         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 718         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
 719 }
 720
 721 static void __remove_osd_from_lru(struct ceph_osd *osd)
 722 {
 723         dout("__remove_osd_from_lru %p\n", osd);
 724         if (!list_empty(&osd->o_osd_lru))
 725                 list_del_init(&osd->o_osd_lru);
 726 }
 727
 728 static void remove_old_osds(struct ceph_osd_client *osdc)
 729 {
 730         struct ceph_osd *osd, *nosd;
 731
 732         dout("__remove_old_osds %p\n", osdc);
 733         mutex_lock(&osdc->request_mutex);
 734         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 735                 if (time_before(jiffies, osd->lru_ttl))
 736                         break;
 737                 __remove_osd(osdc, osd);
 738         }
 739         mutex_unlock(&osdc->request_mutex);
 740 }
 741
 742 /*
 743  * reset osd connect
 744  */
 745 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 746 {
 747         struct ceph_osd_request *req;
 748         int ret = 0;
 749
 750         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 751         if (list_empty(&osd->o_requests) &&
 752             list_empty(&osd->o_linger_requests)) {
 753                 __remove_osd(osdc, osd);
 754         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
 755                           &osd->o_con.peer_addr,
 756                           sizeof(osd->o_con.peer_addr)) == 0 &&
 757                    !ceph_con_opened(&osd->o_con)) {
 758                 dout(" osd addr hasn't changed and connection never opened,"
 759                      " letting msgr retry");
 760                 /* touch each r_stamp for handle_timeout()'s benfit */
 761                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
 762                         req->r_stamp = jiffies;
 763                 ret = -EAGAIN;
 764         } else {
 765                 ceph_con_close(&osd->o_con);
 766                 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
 767                               &osdc->osdmap->osd_addr[osd->o_osd]);
 768                 osd->o_incarnation++;
 769         }
 770         return ret;
 771 }
 772
 773 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 774 {
 775         struct rb_node **p = &osdc->osds.rb_node;
 776         struct rb_node *parent = NULL;
 777         struct ceph_osd *osd = NULL;
 778
 779         dout("__insert_osd %p osd%d\n", new, new->o_osd);
 780         while (*p) {
 781                 parent = *p;
 782                 osd = rb_entry(parent, struct ceph_osd, o_node);
 783                 if (new->o_osd < osd->o_osd)
 784                         p = &(*p)->rb_left;
 785                 else if (new->o_osd > osd->o_osd)
 786                         p = &(*p)->rb_right;
 787                 else
 788                         BUG();
 789         }
 790
 791         rb_link_node(&new->o_node, parent, p);
 792         rb_insert_color(&new->o_node, &osdc->osds);
 793 }
 794
 795 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 796 {
 797         struct ceph_osd *osd;
 798         struct rb_node *n = osdc->osds.rb_node;
 799
 800         while (n) {
 801                 osd = rb_entry(n, struct ceph_osd, o_node);
 802                 if (o < osd->o_osd)
 803                         n = n->rb_left;
 804                 else if (o > osd->o_osd)
 805                         n = n->rb_right;
 806                 else
 807                         return osd;
 808         }
 809         return NULL;
 810 }
 811
 812 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
 813 {
 814         schedule_delayed_work(&osdc->timeout_work,
 815                         osdc->client->options->osd_keepalive_timeout * HZ);
 816 }
 817
 818 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
 819 {
 820         cancel_delayed_work(&osdc->timeout_work);
 821 }
 822
 823 /*
 824  * Register request, assign tid.  If this is the first request, set up
 825  * the timeout event.
 826  */
 827 static void __register_request(struct ceph_osd_client *osdc,
 828                                struct ceph_osd_request *req)
 829 {
 830         req->r_tid = ++osdc->last_tid;
 831         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 832         dout("__register_request %p tid %lld\n", req, req->r_tid);
 833         __insert_request(osdc, req);
 834         ceph_osdc_get_request(req);
 835         osdc->num_requests++;
 836         if (osdc->num_requests == 1) {
 837                 dout(" first request, scheduling timeout\n");
 838                 __schedule_osd_timeout(osdc);
 839         }
 840 }
 841
 842 static void register_request(struct ceph_osd_client *osdc,
 843                              struct ceph_osd_request *req)
 844 {
 845         mutex_lock(&osdc->request_mutex);
 846         __register_request(osdc, req);
 847         mutex_unlock(&osdc->request_mutex);
 848 }
 849
 850 /*
 851  * called under osdc->request_mutex
 852  */
 853 static void __unregister_request(struct ceph_osd_client *osdc,
 854                                  struct ceph_osd_request *req)
 855 {
 856         if (RB_EMPTY_NODE(&req->r_node)) {
 857                 dout("__unregister_request %p tid %lld not registered\n",
 858                         req, req->r_tid);
 859                 return;
 860         }
 861
 862         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 863         rb_erase(&req->r_node, &osdc->requests);
 864         osdc->num_requests--;
 865
 866         if (req->r_osd) {
 867                 /* make sure the original request isn't in flight. */
 868                 ceph_msg_revoke(req->r_request);
 869
 870                 list_del_init(&req->r_osd_item);
 871                 if (list_empty(&req->r_osd->o_requests) &&
 872                     list_empty(&req->r_osd->o_linger_requests)) {
 873                         dout("moving osd to %p lru\n", req->r_osd);
 874                         __move_osd_to_lru(osdc, req->r_osd);
 875                 }
 876                 if (list_empty(&req->r_linger_item))
 877                         req->r_osd = NULL;
 878         }
 879
 880         ceph_osdc_put_request(req);
 881
 882         list_del_init(&req->r_req_lru_item);
 883         if (osdc->num_requests == 0) {
 884                 dout(" no requests, canceling timeout\n");
 885                 __cancel_osd_timeout(osdc);
 886         }
 887 }
 888
 889 /*
 890  * Cancel a previously queued request message
 891  */
 892 static void __cancel_request(struct ceph_osd_request *req)
 893 {
 894         if (req->r_sent && req->r_osd) {
 895                 ceph_msg_revoke(req->r_request);
 896                 req->r_sent = 0;
 897         }
 898 }
 899
 900 static void __register_linger_request(struct ceph_osd_client *osdc,
 901                                     struct ceph_osd_request *req)
 902 {
 903         dout("__register_linger_request %p\n", req);
 904         list_add_tail(&req->r_linger_item, &osdc->req_linger);
 905         if (req->r_osd)
 906                 list_add_tail(&req->r_linger_osd,
 907                               &req->r_osd->o_linger_requests);
 908 }
 909
 910 static void __unregister_linger_request(struct ceph_osd_client *osdc,
 911                                         struct ceph_osd_request *req)
 912 {
 913         dout("__unregister_linger_request %p\n", req);
 914         if (req->r_osd) {
 915                 list_del_init(&req->r_linger_item);
 916                 list_del_init(&req->r_linger_osd);
 917
 918                 if (list_empty(&req->r_osd->o_requests) &&
 919                     list_empty(&req->r_osd->o_linger_requests)) {
 920                         dout("moving osd to %p lru\n", req->r_osd);
 921                         __move_osd_to_lru(osdc, req->r_osd);
 922                 }
 923                 if (list_empty(&req->r_osd_item))
 924                         req->r_osd = NULL;
 925         }
 926 }
 927
 928 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
 929                                          struct ceph_osd_request *req)
 930 {
 931         mutex_lock(&osdc->request_mutex);
 932         if (req->r_linger) {
 933                 __unregister_linger_request(osdc, req);
 934                 ceph_osdc_put_request(req);
 935         }
 936         mutex_unlock(&osdc->request_mutex);
 937 }
 938 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
 939
 940 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 941                                   struct ceph_osd_request *req)
 942 {
 943         if (!req->r_linger) {
 944                 dout("set_request_linger %p\n", req);
 945                 req->r_linger = 1;
 946                 /*
 947                  * caller is now responsible for calling
 948                  * unregister_linger_request
 949                  */
 950                 ceph_osdc_get_request(req);
 951         }
 952 }
 953 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
 954
 955 /*
 956  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 957  * (as needed), and set the request r_osd appropriately.  If there is
 958  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
 959  * (unsent, homeless) or leave on in-flight lru.
 960  *
 961  * Return 0 if unchanged, 1 if changed, or negative on error.
 962  *
 963  * Caller should hold map_sem for read and request_mutex.
 964  */
 965 static int __map_request(struct ceph_osd_client *osdc,
 966                          struct ceph_osd_request *req, int force_resend)
 967 {
 968         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 969         struct ceph_pg pgid;
 970         int acting[CEPH_PG_MAX_SIZE];
 971         int o = -1, num = 0;
 972         int err;
 973
 974         dout("map_request %p tid %lld\n", req, req->r_tid);
 975         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 976                                       &req->r_file_layout, osdc->osdmap);
 977         if (err) {
 978                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
 979                 return err;
 980         }
 981         pgid = reqhead->layout.ol_pgid;
 982         req->r_pgid = pgid;
 983
 984         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
 985         if (err > 0) {
 986                 o = acting[0];
 987                 num = err;
 988         }
 989
 990         if ((!force_resend &&
 991              req->r_osd && req->r_osd->o_osd == o &&
 992              req->r_sent >= req->r_osd->o_incarnation &&
 993              req->r_num_pg_osds == num &&
 994              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
 995             (req->r_osd == NULL && o == -1))
 996                 return 0;  /* no change */
 997
 998         dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
 999              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
1000              req->r_osd ? req->r_osd->o_osd : -1);
1001
1002         /* record full pg acting set */
1003         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1004         req->r_num_pg_osds = num;
1005
1006         if (req->r_osd) {
1007                 __cancel_request(req);
1008                 list_del_init(&req->r_osd_item);
1009                 req->r_osd = NULL;
1010         }
1011
1012         req->r_osd = __lookup_osd(osdc, o);
1013         if (!req->r_osd && o >= 0) {
1014                 err = -ENOMEM;
1015                 req->r_osd = create_osd(osdc, o);
1016                 if (!req->r_osd) {
1017                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1018                         goto out;
1019                 }
1020
1021                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1022                 __insert_osd(osdc, req->r_osd);
1023
1024                 ceph_con_open(&req->r_osd->o_con,
1025                               CEPH_ENTITY_TYPE_OSD, o,
1026                               &osdc->osdmap->osd_addr[o]);
1027         }
1028
1029         if (req->r_osd) {
1030                 __remove_osd_from_lru(req->r_osd);
1031                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
1032                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1033         } else {
1034                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1035         }
1036         err = 1;   /* osd or pg changed */
1037
1038 out:
1039         return err;
1040 }
1041
1042 /*
1043  * caller should hold map_sem (for read) and request_mutex
1044  */
1045 static void __send_request(struct ceph_osd_client *osdc,
1046                            struct ceph_osd_request *req)
1047 {
1048         struct ceph_osd_request_head *reqhead;
1049
1050         dout("send_request %p tid %llu to osd%d flags %d\n",
1051              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1052
1053         reqhead = req->r_request->front.iov_base;
1054         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1055         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
1056         reqhead->reassert_version = req->r_reassert_version;
1057
1058         req->r_stamp = jiffies;
1059         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1060
1061         ceph_msg_get(req->r_request); /* send consumes a ref */
1062         ceph_con_send(&req->r_osd->o_con, req->r_request);
1063         req->r_sent = req->r_osd->o_incarnation;
1064 }
1065
1066 /*
1067  * Send any requests in the queue (req_unsent).
1068  */
1069 static void send_queued(struct ceph_osd_client *osdc)
1070 {
1071         struct ceph_osd_request *req, *tmp;
1072
1073         dout("send_queued\n");
1074         mutex_lock(&osdc->request_mutex);
1075         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1076                 __send_request(osdc, req);
1077         }
1078         mutex_unlock(&osdc->request_mutex);
1079 }
1080
1081 /*
1082  * Timeout callback, called every N seconds when 1 or more osd
1083  * requests has been active for more than N seconds.  When this
1084  * happens, we ping all OSDs with requests who have timed out to
1085  * ensure any communications channel reset is detected.  Reset the
1086  * request timeouts another N seconds in the future as we go.
1087  * Reschedule the timeout event another N seconds in future (unless
1088  * there are no open requests).
1089  */
1090 static void handle_timeout(struct work_struct *work)
1091 {
1092         struct ceph_osd_client *osdc =
1093                 container_of(work, struct ceph_osd_client, timeout_work.work);
1094         struct ceph_osd_request *req, *last_req = NULL;
1095         struct ceph_osd *osd;
1096         unsigned long timeout = osdc->client->options->osd_timeout * HZ;
1097         unsigned long keepalive =
1098                 osdc->client->options->osd_keepalive_timeout * HZ;
1099         unsigned long last_stamp = 0;
1100         struct list_head slow_osds;
1101         dout("timeout\n");
1102         down_read(&osdc->map_sem);
1103
1104         ceph_monc_request_next_osdmap(&osdc->client->monc);
1105
1106         mutex_lock(&osdc->request_mutex);
1107
1108         /*
1109          * reset osds that appear to be _really_ unresponsive.  this
1110          * is a failsafe measure.. we really shouldn't be getting to
1111          * this point if the system is working properly.  the monitors
1112          * should mark the osd as failed and we should find out about
1113          * it from an updated osd map.
1114          */
1115         while (timeout && !list_empty(&osdc->req_lru)) {
1116                 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1117                                  r_req_lru_item);
1118
1119                 /* hasn't been long enough since we sent it? */
1120                 if (time_before(jiffies, req->r_stamp + timeout))
1121                         break;
1122
1123                 /* hasn't been long enough since it was acked? */
1124                 if (req->r_request->ack_stamp == 0 ||
1125                     time_before(jiffies, req->r_request->ack_stamp + timeout))
1126                         break;
1127
1128                 BUG_ON(req == last_req && req->r_stamp == last_stamp);
1129                 last_req = req;
1130                 last_stamp = req->r_stamp;
1131
1132                 osd = req->r_osd;
1133                 BUG_ON(!osd);
1134                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1135                            req->r_tid, osd->o_osd);
1136                 __kick_osd_requests(osdc, osd);
1137         }
1138
1139         /*
1140          * ping osds that are a bit slow.  this ensures that if there
1141          * is a break in the TCP connection we will notice, and reopen
1142          * a connection with that osd (from the fault callback).
1143          */
1144         INIT_LIST_HEAD(&slow_osds);
1145         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1146                 if (time_before(jiffies, req->r_stamp + keepalive))
1147                         break;
1148
1149                 osd = req->r_osd;
1150                 BUG_ON(!osd);
1151                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1152                      req->r_tid, osd->o_osd);
1153                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1154         }
1155         while (!list_empty(&slow_osds)) {
1156                 osd = list_entry(slow_osds.next, struct ceph_osd,
1157                                  o_keepalive_item);
1158                 list_del_init(&osd->o_keepalive_item);
1159                 ceph_con_keepalive(&osd->o_con);
1160         }
1161
1162         __schedule_osd_timeout(osdc);
1163         mutex_unlock(&osdc->request_mutex);
1164         send_queued(osdc);
1165         up_read(&osdc->map_sem);
1166 }
1167
1168 static void handle_osds_timeout(struct work_struct *work)
1169 {
1170         struct ceph_osd_client *osdc =
1171                 container_of(work, struct ceph_osd_client,
1172                              osds_timeout_work.work);
1173         unsigned long delay =
1174                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1175
1176         dout("osds timeout\n");
1177         down_read(&osdc->map_sem);
1178         remove_old_osds(osdc);
1179         up_read(&osdc->map_sem);
1180
1181         schedule_delayed_work(&osdc->osds_timeout_work,
1182                               round_jiffies_relative(delay));
1183 }
1184
1185 static void complete_request(struct ceph_osd_request *req)
1186 {
1187         if (req->r_safe_callback)
1188                 req->r_safe_callback(req, NULL);
1189         complete_all(&req->r_safe_completion);  /* fsync waiter */
1190 }
1191
1192 /*
1193  * handle osd op reply.  either call the callback if it is specified,
1194  * or do the completion to wake up the waiting thread.
1195  */
1196 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1197                          struct ceph_connection *con)
1198 {
1199         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1200         struct ceph_osd_request *req;
1201         u64 tid;
1202         int numops, object_len, flags;
1203         s32 result;
1204
1205         tid = le64_to_cpu(msg->hdr.tid);
1206         if (msg->front.iov_len < sizeof(*rhead))
1207                 goto bad;
1208         numops = le32_to_cpu(rhead->num_ops);
1209         object_len = le32_to_cpu(rhead->object_len);
1210         result = le32_to_cpu(rhead->result);
1211         if (msg->front.iov_len != sizeof(*rhead) + object_len +
1212             numops * sizeof(struct ceph_osd_op))
1213                 goto bad;
1214         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1215         /* lookup */
1216         mutex_lock(&osdc->request_mutex);
1217         req = __lookup_request(osdc, tid);
1218         if (req == NULL) {
1219                 dout("handle_reply tid %llu dne\n", tid);
1220                 mutex_unlock(&osdc->request_mutex);
1221                 return;
1222         }
1223         ceph_osdc_get_request(req);
1224         flags = le32_to_cpu(rhead->flags);
1225
1226         /*
1227          * if this connection filled our message, drop our reference now, to
1228          * avoid a (safe but slower) revoke later.
1229          */
1230         if (req->r_con_filling_msg == con && req->r_reply == msg) {
1231                 dout(" dropping con_filling_msg ref %p\n", con);
1232                 req->r_con_filling_msg = NULL;
1233                 con->ops->put(con);
1234         }
1235
1236         if (!req->r_got_reply) {
1237                 unsigned int bytes;
1238
1239                 req->r_result = le32_to_cpu(rhead->result);
1240                 bytes = le32_to_cpu(msg->hdr.data_len);
1241                 dout("handle_reply result %d bytes %d\n", req->r_result,
1242                      bytes);
1243                 if (req->r_result == 0)
1244                         req->r_result = bytes;
1245
1246                 /* in case this is a write and we need to replay, */
1247                 req->r_reassert_version = rhead->reassert_version;
1248
1249                 req->r_got_reply = 1;
1250         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1251                 dout("handle_reply tid %llu dup ack\n", tid);
1252                 mutex_unlock(&osdc->request_mutex);
1253                 goto done;
1254         }
1255
1256         dout("handle_reply tid %llu flags %d\n", tid, flags);
1257
1258         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1259                 __register_linger_request(osdc, req);
1260
1261         /* either this is a read, or we got the safe response */
1262         if (result < 0 ||
1263             (flags & CEPH_OSD_FLAG_ONDISK) ||
1264             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1265                 __unregister_request(osdc, req);
1266
1267         mutex_unlock(&osdc->request_mutex);
1268
1269         if (req->r_callback)
1270                 req->r_callback(req, msg);
1271         else
1272                 complete_all(&req->r_completion);
1273
1274         if (flags & CEPH_OSD_FLAG_ONDISK)
1275                 complete_request(req);
1276
1277 done:
1278         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1279         ceph_osdc_put_request(req);
1280         return;
1281
1282 bad:
1283         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1284                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1285                (int)sizeof(*rhead));
1286         ceph_msg_dump(msg);
1287 }
1288
1289 static void reset_changed_osds(struct ceph_osd_client *osdc)
1290 {
1291         struct rb_node *p, *n;
1292
1293         for (p = rb_first(&osdc->osds); p; p = n) {
1294                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1295
1296                 n = rb_next(p);
1297                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1298                     memcmp(&osd->o_con.peer_addr,
1299                            ceph_osd_addr(osdc->osdmap,
1300                                          osd->o_osd),
1301                            sizeof(struct ceph_entity_addr)) != 0)
1302                         __reset_osd(osdc, osd);
1303         }
1304 }
1305
1306 /*
1307  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1308  * no osd, request a new map.
1309  *
1310  * Caller should hold map_sem for read and request_mutex.
1311  */
1312 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1313 {
1314         struct ceph_osd_request *req, *nreq;
1315         struct rb_node *p;
1316         int needmap = 0;
1317         int err;
1318
1319         dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1320         mutex_lock(&osdc->request_mutex);
1321         for (p = rb_first(&osdc->requests); p; ) {
1322                 req = rb_entry(p, struct ceph_osd_request, r_node);
1323                 p = rb_next(p);
1324                 err = __map_request(osdc, req, force_resend);
1325                 if (err < 0)
1326                         continue;  /* error */
1327                 if (req->r_osd == NULL) {
1328                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1329                         needmap++;  /* request a newer map */
1330                 } else if (err > 0) {
1331                         if (!req->r_linger) {
1332                                 dout("%p tid %llu requeued on osd%d\n", req,
1333                                      req->r_tid,
1334                                      req->r_osd ? req->r_osd->o_osd : -1);
1335                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1336                         }
1337                 }
1338                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1339                         /*
1340                          * register as a linger so that we will
1341                          * re-submit below and get a new tid
1342                          */
1343                         dout("%p tid %llu restart on osd%d\n",
1344                              req, req->r_tid,
1345                              req->r_osd ? req->r_osd->o_osd : -1);
1346                         __register_linger_request(osdc, req);
1347                         __unregister_request(osdc, req);
1348                 }
1349         }
1350
1351         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1352                                  r_linger_item) {
1353                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1354
1355                 err = __map_request(osdc, req, force_resend);
1356                 if (err == 0)
1357                         continue;  /* no change and no osd was specified */
1358                 if (err < 0)
1359                         continue;  /* hrm! */
1360                 if (req->r_osd == NULL) {
1361                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1362                         needmap++;  /* request a newer map */
1363                         continue;
1364                 }
1365
1366                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1367                      req->r_osd ? req->r_osd->o_osd : -1);
1368                 __unregister_linger_request(osdc, req);
1369                 __register_request(osdc, req);
1370         }
1371         mutex_unlock(&osdc->request_mutex);
1372
1373         if (needmap) {
1374                 dout("%d requests for down osds, need new map\n", needmap);
1375                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1376         }
1377 }
1378
1379
1380 /*
1381  * Process updated osd map.
1382  *
1383  * The message contains any number of incremental and full maps, normally
1384  * indicating some sort of topology change in the cluster.  Kick requests
1385  * off to different OSDs as needed.
1386  */
1387 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1388 {
1389         void *p, *end, *next;
1390         u32 nr_maps, maplen;
1391         u32 epoch;
1392         struct ceph_osdmap *newmap = NULL, *oldmap;
1393         int err;
1394         struct ceph_fsid fsid;
1395
1396         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1397         p = msg->front.iov_base;
1398         end = p + msg->front.iov_len;
1399
1400         /* verify fsid */
1401         ceph_decode_need(&p, end, sizeof(fsid), bad);
1402         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1403         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1404                 return;
1405
1406         down_write(&osdc->map_sem);
1407
1408         /* incremental maps */
1409         ceph_decode_32_safe(&p, end, nr_maps, bad);
1410         dout(" %d inc maps\n", nr_maps);
1411         while (nr_maps > 0) {
1412                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1413                 epoch = ceph_decode_32(&p);
1414                 maplen = ceph_decode_32(&p);
1415                 ceph_decode_need(&p, end, maplen, bad);
1416                 next = p + maplen;
1417                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1418                         dout("applying incremental map %u len %d\n",
1419                              epoch, maplen);
1420                         newmap = osdmap_apply_incremental(&p, next,
1421                                                           osdc->osdmap,
1422                                                           &osdc->client->msgr);
1423                         if (IS_ERR(newmap)) {
1424                                 err = PTR_ERR(newmap);
1425                                 goto bad;
1426                         }
1427                         BUG_ON(!newmap);
1428                         if (newmap != osdc->osdmap) {
1429                                 ceph_osdmap_destroy(osdc->osdmap);
1430                                 osdc->osdmap = newmap;
1431                         }
1432                         kick_requests(osdc, 0);
1433                         reset_changed_osds(osdc);
1434                 } else {
1435                         dout("ignoring incremental map %u len %d\n",
1436                              epoch, maplen);
1437                 }
1438                 p = next;
1439                 nr_maps--;
1440         }
1441         if (newmap)
1442                 goto done;
1443
1444         /* full maps */
1445         ceph_decode_32_safe(&p, end, nr_maps, bad);
1446         dout(" %d full maps\n", nr_maps);
1447         while (nr_maps) {
1448                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1449                 epoch = ceph_decode_32(&p);
1450                 maplen = ceph_decode_32(&p);
1451                 ceph_decode_need(&p, end, maplen, bad);
1452                 if (nr_maps > 1) {
1453                         dout("skipping non-latest full map %u len %d\n",
1454                              epoch, maplen);
1455                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1456                         dout("skipping full map %u len %d, "
1457                              "older than our %u\n", epoch, maplen,
1458                              osdc->osdmap->epoch);
1459                 } else {
1460                         int skipped_map = 0;
1461
1462                         dout("taking full map %u len %d\n", epoch, maplen);
1463                         newmap = osdmap_decode(&p, p+maplen);
1464                         if (IS_ERR(newmap)) {
1465                                 err = PTR_ERR(newmap);
1466                                 goto bad;
1467                         }
1468                         BUG_ON(!newmap);
1469                         oldmap = osdc->osdmap;
1470                         osdc->osdmap = newmap;
1471                         if (oldmap) {
1472                                 if (oldmap->epoch + 1 < newmap->epoch)
1473                                         skipped_map = 1;
1474                                 ceph_osdmap_destroy(oldmap);
1475                         }
1476                         kick_requests(osdc, skipped_map);
1477                 }
1478                 p += maplen;
1479                 nr_maps--;
1480         }
1481
1482 done:
1483         downgrade_write(&osdc->map_sem);
1484         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1485
1486         /*
1487          * subscribe to subsequent osdmap updates if full to ensure
1488          * we find out when we are no longer full and stop returning
1489          * ENOSPC.
1490          */
1491         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1492                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1493
1494         send_queued(osdc);
1495         up_read(&osdc->map_sem);
1496         wake_up_all(&osdc->client->auth_wq);
1497         return;
1498
1499 bad:
1500         pr_err("osdc handle_map corrupt msg\n");
1501         ceph_msg_dump(msg);
1502         up_write(&osdc->map_sem);
1503         return;
1504 }
1505
1506 /*
1507  * watch/notify callback event infrastructure
1508  *
1509  * These callbacks are used both for watch and notify operations.
1510  */
1511 static void __release_event(struct kref *kref)
1512 {
1513         struct ceph_osd_event *event =
1514                 container_of(kref, struct ceph_osd_event, kref);
1515
1516         dout("__release_event %p\n", event);
1517         kfree(event);
1518 }
1519
1520 static void get_event(struct ceph_osd_event *event)
1521 {
1522         kref_get(&event->kref);
1523 }
1524
1525 void ceph_osdc_put_event(struct ceph_osd_event *event)
1526 {
1527         kref_put(&event->kref, __release_event);
1528 }
1529 EXPORT_SYMBOL(ceph_osdc_put_event);
1530
1531 static void __insert_event(struct ceph_osd_client *osdc,
1532                              struct ceph_osd_event *new)
1533 {
1534         struct rb_node **p = &osdc->event_tree.rb_node;
1535         struct rb_node *parent = NULL;
1536         struct ceph_osd_event *event = NULL;
1537
1538         while (*p) {
1539                 parent = *p;
1540                 event = rb_entry(parent, struct ceph_osd_event, node);
1541                 if (new->cookie < event->cookie)
1542                         p = &(*p)->rb_left;
1543                 else if (new->cookie > event->cookie)
1544                         p = &(*p)->rb_right;
1545                 else
1546                         BUG();
1547         }
1548
1549         rb_link_node(&new->node, parent, p);
1550         rb_insert_color(&new->node, &osdc->event_tree);
1551 }
1552
1553 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1554                                                 u64 cookie)
1555 {
1556         struct rb_node **p = &osdc->event_tree.rb_node;
1557         struct rb_node *parent = NULL;
1558         struct ceph_osd_event *event = NULL;
1559
1560         while (*p) {
1561                 parent = *p;
1562                 event = rb_entry(parent, struct ceph_osd_event, node);
1563                 if (cookie < event->cookie)
1564                         p = &(*p)->rb_left;
1565                 else if (cookie > event->cookie)
1566                         p = &(*p)->rb_right;
1567                 else
1568                         return event;
1569         }
1570         return NULL;
1571 }
1572
1573 static void __remove_event(struct ceph_osd_event *event)
1574 {
1575         struct ceph_osd_client *osdc = event->osdc;
1576
1577         if (!RB_EMPTY_NODE(&event->node)) {
1578                 dout("__remove_event removed %p\n", event);
1579                 rb_erase(&event->node, &osdc->event_tree);
1580                 ceph_osdc_put_event(event);
1581         } else {
1582                 dout("__remove_event didn't remove %p\n", event);
1583         }
1584 }
1585
1586 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1587                            void (*event_cb)(u64, u64, u8, void *),
1588                            int one_shot, void *data,
1589                            struct ceph_osd_event **pevent)
1590 {
1591         struct ceph_osd_event *event;
1592
1593         event = kmalloc(sizeof(*event), GFP_NOIO);
1594         if (!event)
1595                 return -ENOMEM;
1596
1597         dout("create_event %p\n", event);
1598         event->cb = event_cb;
1599         event->one_shot = one_shot;
1600         event->data = data;
1601         event->osdc = osdc;
1602         INIT_LIST_HEAD(&event->osd_node);
1603         kref_init(&event->kref);   /* one ref for us */
1604         kref_get(&event->kref);    /* one ref for the caller */
1605         init_completion(&event->completion);
1606
1607         spin_lock(&osdc->event_lock);
1608         event->cookie = ++osdc->event_count;
1609         __insert_event(osdc, event);
1610         spin_unlock(&osdc->event_lock);
1611
1612         *pevent = event;
1613         return 0;
1614 }
1615 EXPORT_SYMBOL(ceph_osdc_create_event);
1616
1617 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1618 {
1619         struct ceph_osd_client *osdc = event->osdc;
1620
1621         dout("cancel_event %p\n", event);
1622         spin_lock(&osdc->event_lock);
1623         __remove_event(event);
1624         spin_unlock(&osdc->event_lock);
1625         ceph_osdc_put_event(event); /* caller's */
1626 }
1627 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1628
1629
1630 static void do_event_work(struct work_struct *work)
1631 {
1632         struct ceph_osd_event_work *event_work =
1633                 container_of(work, struct ceph_osd_event_work, work);
1634         struct ceph_osd_event *event = event_work->event;
1635         u64 ver = event_work->ver;
1636         u64 notify_id = event_work->notify_id;
1637         u8 opcode = event_work->opcode;
1638
1639         dout("do_event_work completing %p\n", event);
1640         event->cb(ver, notify_id, opcode, event->data);
1641         complete(&event->completion);
1642         dout("do_event_work completed %p\n", event);
1643         ceph_osdc_put_event(event);
1644         kfree(event_work);
1645 }
1646
1647
1648 /*
1649  * Process osd watch notifications
1650  */
1651 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1652 {
1653         void *p, *end;
1654         u8 proto_ver;
1655         u64 cookie, ver, notify_id;
1656         u8 opcode;
1657         struct ceph_osd_event *event;
1658         struct ceph_osd_event_work *event_work;
1659
1660         p = msg->front.iov_base;
1661         end = p + msg->front.iov_len;
1662
1663         ceph_decode_8_safe(&p, end, proto_ver, bad);
1664         ceph_decode_8_safe(&p, end, opcode, bad);
1665         ceph_decode_64_safe(&p, end, cookie, bad);
1666         ceph_decode_64_safe(&p, end, ver, bad);
1667         ceph_decode_64_safe(&p, end, notify_id, bad);
1668
1669         spin_lock(&osdc->event_lock);
1670         event = __find_event(osdc, cookie);
1671         if (event) {
1672                 get_event(event);
1673                 if (event->one_shot)
1674                         __remove_event(event);
1675         }
1676         spin_unlock(&osdc->event_lock);
1677         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1678              cookie, ver, event);
1679         if (event) {
1680                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1681                 if (!event_work) {
1682                         dout("ERROR: could not allocate event_work\n");
1683                         goto done_err;
1684                 }
1685                 INIT_WORK(&event_work->work, do_event_work);
1686                 event_work->event = event;
1687                 event_work->ver = ver;
1688                 event_work->notify_id = notify_id;
1689                 event_work->opcode = opcode;
1690                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1691                         dout("WARNING: failed to queue notify event work\n");
1692                         goto done_err;
1693                 }
1694         }
1695
1696         return;
1697
1698 done_err:
1699         complete(&event->completion);
1700         ceph_osdc_put_event(event);
1701         return;
1702
1703 bad:
1704         pr_err("osdc handle_watch_notify corrupt msg\n");
1705         return;
1706 }
1707
1708 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1709 {
1710         int err;
1711
1712         dout("wait_event %p\n", event);
1713         err = wait_for_completion_interruptible_timeout(&event->completion,
1714                                                         timeout * HZ);
1715         ceph_osdc_put_event(event);
1716         if (err > 0)
1717                 err = 0;
1718         dout("wait_event %p returns %d\n", event, err);
1719         return err;
1720 }
1721 EXPORT_SYMBOL(ceph_osdc_wait_event);
1722
1723 /*
1724  * Register request, send initial attempt.
1725  */
1726 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1727                             struct ceph_osd_request *req,
1728                             bool nofail)
1729 {
1730         int rc = 0;
1731
1732         req->r_request->pages = req->r_pages;
1733         req->r_request->nr_pages = req->r_num_pages;
1734 #ifdef CONFIG_BLOCK
1735         req->r_request->bio = req->r_bio;
1736 #endif
1737         req->r_request->trail = req->r_trail;
1738
1739         register_request(osdc, req);
1740
1741         down_read(&osdc->map_sem);
1742         mutex_lock(&osdc->request_mutex);
1743         /*
1744          * a racing kick_requests() may have sent the message for us
1745          * while we dropped request_mutex above, so only send now if
1746          * the request still han't been touched yet.
1747          */
1748         if (req->r_sent == 0) {
1749                 rc = __map_request(osdc, req, 0);
1750                 if (rc < 0) {
1751                         if (nofail) {
1752                                 dout("osdc_start_request failed map, "
1753                                      " will retry %lld\n", req->r_tid);
1754                                 rc = 0;
1755                         }
1756                         goto out_unlock;
1757                 }
1758                 if (req->r_osd == NULL) {
1759                         dout("send_request %p no up osds in pg\n", req);
1760                         ceph_monc_request_next_osdmap(&osdc->client->monc);
1761                 } else {
1762                         __send_request(osdc, req);
1763                 }
1764                 rc = 0;
1765         }
1766
1767 out_unlock:
1768         mutex_unlock(&osdc->request_mutex);
1769         up_read(&osdc->map_sem);
1770         return rc;
1771 }
1772 EXPORT_SYMBOL(ceph_osdc_start_request);
1773
1774 /*
1775  * wait for a request to complete
1776  */
1777 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1778                            struct ceph_osd_request *req)
1779 {
1780         int rc;
1781
1782         rc = wait_for_completion_interruptible(&req->r_completion);
1783         if (rc < 0) {
1784                 mutex_lock(&osdc->request_mutex);
1785                 __cancel_request(req);
1786                 __unregister_request(osdc, req);
1787                 mutex_unlock(&osdc->request_mutex);
1788                 complete_request(req);
1789                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1790                 return rc;
1791         }
1792
1793         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1794         return req->r_result;
1795 }
1796 EXPORT_SYMBOL(ceph_osdc_wait_request);
1797
1798 /*
1799  * sync - wait for all in-flight requests to flush.  avoid starvation.
1800  */
1801 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1802 {
1803         struct ceph_osd_request *req;
1804         u64 last_tid, next_tid = 0;
1805
1806         mutex_lock(&osdc->request_mutex);
1807         last_tid = osdc->last_tid;
1808         while (1) {
1809                 req = __lookup_request_ge(osdc, next_tid);
1810                 if (!req)
1811                         break;
1812                 if (req->r_tid > last_tid)
1813                         break;
1814
1815                 next_tid = req->r_tid + 1;
1816                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1817                         continue;
1818
1819                 ceph_osdc_get_request(req);
1820                 mutex_unlock(&osdc->request_mutex);
1821                 dout("sync waiting on tid %llu (last is %llu)\n",
1822                      req->r_tid, last_tid);
1823                 wait_for_completion(&req->r_safe_completion);
1824                 mutex_lock(&osdc->request_mutex);
1825                 ceph_osdc_put_request(req);
1826         }
1827         mutex_unlock(&osdc->request_mutex);
1828         dout("sync done (thru tid %llu)\n", last_tid);
1829 }
1830 EXPORT_SYMBOL(ceph_osdc_sync);
1831
1832 /*
1833  * init, shutdown
1834  */
1835 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1836 {
1837         int err;
1838
1839         dout("init\n");
1840         osdc->client = client;
1841         osdc->osdmap = NULL;
1842         init_rwsem(&osdc->map_sem);
1843         init_completion(&osdc->map_waiters);
1844         osdc->last_requested_map = 0;
1845         mutex_init(&osdc->request_mutex);
1846         osdc->last_tid = 0;
1847         osdc->osds = RB_ROOT;
1848         INIT_LIST_HEAD(&osdc->osd_lru);
1849         osdc->requests = RB_ROOT;
1850         INIT_LIST_HEAD(&osdc->req_lru);
1851         INIT_LIST_HEAD(&osdc->req_unsent);
1852         INIT_LIST_HEAD(&osdc->req_notarget);
1853         INIT_LIST_HEAD(&osdc->req_linger);
1854         osdc->num_requests = 0;
1855         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1856         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1857         spin_lock_init(&osdc->event_lock);
1858         osdc->event_tree = RB_ROOT;
1859         osdc->event_count = 0;
1860
1861         schedule_delayed_work(&osdc->osds_timeout_work,
1862            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1863
1864         err = -ENOMEM;
1865         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1866                                         sizeof(struct ceph_osd_request));
1867         if (!osdc->req_mempool)
1868                 goto out;
1869
1870         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
1871                                 OSD_OP_FRONT_LEN, 10, true,
1872                                 "osd_op");
1873         if (err < 0)
1874                 goto out_mempool;
1875         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1876                                 OSD_OPREPLY_FRONT_LEN, 10, true,
1877                                 "osd_op_reply");
1878         if (err < 0)
1879                 goto out_msgpool;
1880
1881         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1882         if (IS_ERR(osdc->notify_wq)) {
1883                 err = PTR_ERR(osdc->notify_wq);
1884                 osdc->notify_wq = NULL;
1885                 goto out_msgpool;
1886         }
1887         return 0;
1888
1889 out_msgpool:
1890         ceph_msgpool_destroy(&osdc->msgpool_op);
1891 out_mempool:
1892         mempool_destroy(osdc->req_mempool);
1893 out:
1894         return err;
1895 }
1896 EXPORT_SYMBOL(ceph_osdc_init);
1897
1898 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1899 {
1900         flush_workqueue(osdc->notify_wq);
1901         destroy_workqueue(osdc->notify_wq);
1902         cancel_delayed_work_sync(&osdc->timeout_work);
1903         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1904         if (osdc->osdmap) {
1905                 ceph_osdmap_destroy(osdc->osdmap);
1906                 osdc->osdmap = NULL;
1907         }
1908         remove_all_osds(osdc);
1909         mempool_destroy(osdc->req_mempool);
1910         ceph_msgpool_destroy(&osdc->msgpool_op);
1911         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1912 }
1913 EXPORT_SYMBOL(ceph_osdc_stop);
1914
1915 /*
1916  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1917  * *plen.  Return number of bytes read, or error.
1918  */
1919 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1920                         struct ceph_vino vino, struct ceph_file_layout *layout,
1921                         u64 off, u64 *plen,
1922                         u32 truncate_seq, u64 truncate_size,
1923                         struct page **pages, int num_pages, int page_align)
1924 {
1925         struct ceph_osd_request *req;
1926         int rc = 0;
1927
1928         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1929              vino.snap, off, *plen);
1930         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1931                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1932                                     NULL, 0, truncate_seq, truncate_size, NULL,
1933                                     false, 1, page_align);
1934         if (IS_ERR(req))
1935                 return PTR_ERR(req);
1936
1937         /* it may be a short read due to an object boundary */
1938         req->r_pages = pages;
1939
1940         dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
1941              off, *plen, req->r_num_pages, page_align);
1942
1943         rc = ceph_osdc_start_request(osdc, req, false);
1944         if (!rc)
1945                 rc = ceph_osdc_wait_request(osdc, req);
1946
1947         ceph_osdc_put_request(req);
1948         dout("readpages result %d\n", rc);
1949         return rc;
1950 }
1951 EXPORT_SYMBOL(ceph_osdc_readpages);
1952
1953 /*
1954  * do a synchronous write on N pages
1955  */
1956 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1957                          struct ceph_file_layout *layout,
1958                          struct ceph_snap_context *snapc,
1959                          u64 off, u64 len,
1960                          u32 truncate_seq, u64 truncate_size,
1961                          struct timespec *mtime,
1962                          struct page **pages, int num_pages,
1963                          int flags, int do_sync, bool nofail)
1964 {
1965         struct ceph_osd_request *req;
1966         int rc = 0;
1967         int page_align = off & ~PAGE_MASK;
1968
1969         BUG_ON(vino.snap != CEPH_NOSNAP);
1970         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1971                                     CEPH_OSD_OP_WRITE,
1972                                     flags | CEPH_OSD_FLAG_ONDISK |
1973                                             CEPH_OSD_FLAG_WRITE,
1974                                     snapc, do_sync,
1975                                     truncate_seq, truncate_size, mtime,
1976                                     nofail, 1, page_align);
1977         if (IS_ERR(req))
1978                 return PTR_ERR(req);
1979
1980         /* it may be a short write due to an object boundary */
1981         req->r_pages = pages;
1982         dout("writepages %llu~%llu (%d pages)\n", off, len,
1983              req->r_num_pages);
1984
1985         rc = ceph_osdc_start_request(osdc, req, nofail);
1986         if (!rc)
1987                 rc = ceph_osdc_wait_request(osdc, req);
1988
1989         ceph_osdc_put_request(req);
1990         if (rc == 0)
1991                 rc = len;
1992         dout("writepages result %d\n", rc);
1993         return rc;
1994 }
1995 EXPORT_SYMBOL(ceph_osdc_writepages);
1996
1997 /*
1998  * handle incoming message
1999  */
2000 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2001 {
2002         struct ceph_osd *osd = con->private;
2003         struct ceph_osd_client *osdc;
2004         int type = le16_to_cpu(msg->hdr.type);
2005
2006         if (!osd)
2007                 goto out;
2008         osdc = osd->o_osdc;
2009
2010         switch (type) {
2011         case CEPH_MSG_OSD_MAP:
2012                 ceph_osdc_handle_map(osdc, msg);
2013                 break;
2014         case CEPH_MSG_OSD_OPREPLY:
2015                 handle_reply(osdc, msg, con);
2016                 break;
2017         case CEPH_MSG_WATCH_NOTIFY:
2018                 handle_watch_notify(osdc, msg);
2019                 break;
2020
2021         default:
2022                 pr_err("received unknown message type %d %s\n", type,
2023                        ceph_msg_type_name(type));
2024         }
2025 out:
2026         ceph_msg_put(msg);
2027 }
2028
2029 /*
2030  * lookup and return message for incoming reply.  set up reply message
2031  * pages.
2032  */
2033 static struct ceph_msg *get_reply(struct ceph_connection *con,
2034                                   struct ceph_msg_header *hdr,
2035                                   int *skip)
2036 {
2037         struct ceph_osd *osd = con->private;
2038         struct ceph_osd_client *osdc = osd->o_osdc;
2039         struct ceph_msg *m;
2040         struct ceph_osd_request *req;
2041         int front = le32_to_cpu(hdr->front_len);
2042         int data_len = le32_to_cpu(hdr->data_len);
2043         u64 tid;
2044
2045         tid = le64_to_cpu(hdr->tid);
2046         mutex_lock(&osdc->request_mutex);
2047         req = __lookup_request(osdc, tid);
2048         if (!req) {
2049                 *skip = 1;
2050                 m = NULL;
2051                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2052                      osd->o_osd);
2053                 goto out;
2054         }
2055
2056         if (req->r_con_filling_msg) {
2057                 dout("%s revoking msg %p from old con %p\n", __func__,
2058                      req->r_reply, req->r_con_filling_msg);
2059                 ceph_msg_revoke_incoming(req->r_reply);
2060                 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
2061                 req->r_con_filling_msg = NULL;
2062         }
2063
2064         if (front > req->r_reply->front.iov_len) {
2065                 pr_warning("get_reply front %d > preallocated %d\n",
2066                            front, (int)req->r_reply->front.iov_len);
2067                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2068                 if (!m)
2069                         goto out;
2070                 ceph_msg_put(req->r_reply);
2071                 req->r_reply = m;
2072         }
2073         m = ceph_msg_get(req->r_reply);
2074
2075         if (data_len > 0) {
2076                 int want = calc_pages_for(req->r_page_alignment, data_len);
2077
2078                 if (unlikely(req->r_num_pages < want)) {
2079                         pr_warning("tid %lld reply has %d bytes %d pages, we"
2080                                    " had only %d pages ready\n", tid, data_len,
2081                                    want, req->r_num_pages);
2082                         *skip = 1;
2083                         ceph_msg_put(m);
2084                         m = NULL;
2085                         goto out;
2086                 }
2087                 m->pages = req->r_pages;
2088                 m->nr_pages = req->r_num_pages;
2089                 m->page_alignment = req->r_page_alignment;
2090 #ifdef CONFIG_BLOCK
2091                 m->bio = req->r_bio;
2092 #endif
2093         }
2094         *skip = 0;
2095         req->r_con_filling_msg = con->ops->get(con);
2096         dout("get_reply tid %lld %p\n", tid, m);
2097
2098 out:
2099         mutex_unlock(&osdc->request_mutex);
2100         return m;
2101
2102 }
2103
2104 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2105                                   struct ceph_msg_header *hdr,
2106                                   int *skip)
2107 {
2108         struct ceph_osd *osd = con->private;
2109         int type = le16_to_cpu(hdr->type);
2110         int front = le32_to_cpu(hdr->front_len);
2111
2112         *skip = 0;
2113         switch (type) {
2114         case CEPH_MSG_OSD_MAP:
2115         case CEPH_MSG_WATCH_NOTIFY:
2116                 return ceph_msg_new(type, front, GFP_NOFS, false);
2117         case CEPH_MSG_OSD_OPREPLY:
2118                 return get_reply(con, hdr, skip);
2119         default:
2120                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2121                         osd->o_osd);
2122                 *skip = 1;
2123                 return NULL;
2124         }
2125 }
2126
2127 /*
2128  * Wrappers to refcount containing ceph_osd struct
2129  */
2130 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2131 {
2132         struct ceph_osd *osd = con->private;
2133         if (get_osd(osd))
2134                 return con;
2135         return NULL;
2136 }
2137
2138 static void put_osd_con(struct ceph_connection *con)
2139 {
2140         struct ceph_osd *osd = con->private;
2141         put_osd(osd);
2142 }
2143
2144 /*
2145  * authentication
2146  */
2147 /*
2148  * Note: returned pointer is the address of a structure that's
2149  * managed separately.  Caller must *not* attempt to free it.
2150  */
2151 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2152                                         int *proto, int force_new)
2153 {
2154         struct ceph_osd *o = con->private;
2155         struct ceph_osd_client *osdc = o->o_osdc;
2156         struct ceph_auth_client *ac = osdc->client->monc.auth;
2157         struct ceph_auth_handshake *auth = &o->o_auth;
2158
2159         if (force_new && auth->authorizer) {
2160                 if (ac->ops && ac->ops->destroy_authorizer)
2161                         ac->ops->destroy_authorizer(ac, auth->authorizer);
2162                 auth->authorizer = NULL;
2163         }
2164         if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2165                 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2166                                                         auth);
2167                 if (ret)
2168                         return ERR_PTR(ret);
2169         }
2170         *proto = ac->protocol;
2171
2172         return auth;
2173 }
2174
2175
2176 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2177 {
2178         struct ceph_osd *o = con->private;
2179         struct ceph_osd_client *osdc = o->o_osdc;
2180         struct ceph_auth_client *ac = osdc->client->monc.auth;
2181
2182         /*
2183          * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
2184          * XXX which do we do:  succeed or fail?
2185          */
2186         return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2187 }
2188
2189 static int invalidate_authorizer(struct ceph_connection *con)
2190 {
2191         struct ceph_osd *o = con->private;
2192         struct ceph_osd_client *osdc = o->o_osdc;
2193         struct ceph_auth_client *ac = osdc->client->monc.auth;
2194
2195         if (ac->ops && ac->ops->invalidate_authorizer)
2196                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2197
2198         return ceph_monc_validate_auth(&osdc->client->monc);
2199 }
2200
2201 static const struct ceph_connection_operations osd_con_ops = {
2202         .get = get_osd_con,
2203         .put = put_osd_con,
2204         .dispatch = dispatch,
2205         .get_authorizer = get_authorizer,
2206         .verify_authorizer_reply = verify_authorizer_reply,
2207         .invalidate_authorizer = invalidate_authorizer,
2208         .alloc_msg = alloc_msg,
2209         .fault = osd_reset,
2210 };