net/ceph/osd_client.c

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