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