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