Pileus Git - ~andy/linux/blob - net/ceph/osd_client.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/module.h>
   5 #include <linux/err.h>
   6 #include <linux/highmem.h>
   7 #include <linux/mm.h>
   8 #include <linux/pagemap.h>
   9 #include <linux/slab.h>
  10 #include <linux/uaccess.h>
  11 #ifdef CONFIG_BLOCK
  12 #include <linux/bio.h>
  13 #endif
  14
  15 #include <linux/ceph/libceph.h>
  16 #include <linux/ceph/osd_client.h>
  17 #include <linux/ceph/messenger.h>
  18 #include <linux/ceph/decode.h>
  19 #include <linux/ceph/auth.h>
  20 #include <linux/ceph/pagelist.h>
  21
  22 #define OSD_OP_FRONT_LEN        4096
  23 #define OSD_OPREPLY_FRONT_LEN   512
  24
  25 static const struct ceph_connection_operations osd_con_ops;
  26
  27 static void __send_queued(struct ceph_osd_client *osdc);
  28 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  29 static void __register_request(struct ceph_osd_client *osdc,
  30                                struct ceph_osd_request *req);
  31 static void __unregister_linger_request(struct ceph_osd_client *osdc,
  32                                         struct ceph_osd_request *req);
  33 static void __send_request(struct ceph_osd_client *osdc,
  34                            struct ceph_osd_request *req);
  35
  36 /*
  37  * Implement client access to distributed object storage cluster.
  38  *
  39  * All data objects are stored within a cluster/cloud of OSDs, or
  40  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  41  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  42  * remote daemons serving up and coordinating consistent and safe
  43  * access to storage.
  44  *
  45  * Cluster membership and the mapping of data objects onto storage devices
  46  * are described by the osd map.
  47  *
  48  * We keep track of pending OSD requests (read, write), resubmit
  49  * requests to different OSDs when the cluster topology/data layout
  50  * change, or retry the affected requests when the communications
  51  * channel with an OSD is reset.
  52  */
  53
  54 /*
  55  * calculate the mapping of a file extent onto an object, and fill out the
  56  * request accordingly.  shorten extent as necessary if it crosses an
  57  * object boundary.
  58  *
  59  * fill osd op in request message.
  60  */
  61 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
  62                         u64 *objnum, u64 *objoff, u64 *objlen)
  63 {
  64         u64 orig_len = *plen;
  65         int r;
  66
  67         /* object extent? */
  68         r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
  69                                           objoff, objlen);
  70         if (r < 0)
  71                 return r;
  72         if (*objlen < orig_len) {
  73                 *plen = *objlen;
  74                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  75                      orig_len - *plen, off, *plen);
  76         }
  77
  78         dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
  79
  80         return 0;
  81 }
  82
  83 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
  84 {
  85         memset(osd_data, 0, sizeof (*osd_data));
  86         osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
  87 }
  88
  89 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
  90                         struct page **pages, u64 length, u32 alignment,
  91                         bool pages_from_pool, bool own_pages)
  92 {
  93         osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
  94         osd_data->pages = pages;
  95         osd_data->length = length;
  96         osd_data->alignment = alignment;
  97         osd_data->pages_from_pool = pages_from_pool;
  98         osd_data->own_pages = own_pages;
  99 }
 100
 101 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
 102                         struct ceph_pagelist *pagelist)
 103 {
 104         osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
 105         osd_data->pagelist = pagelist;
 106 }
 107
 108 #ifdef CONFIG_BLOCK
 109 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
 110                         struct bio *bio, size_t bio_length)
 111 {
 112         osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
 113         osd_data->bio = bio;
 114         osd_data->bio_length = bio_length;
 115 }
 116 #endif /* CONFIG_BLOCK */
 117
 118 struct ceph_osd_data *
 119 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
 120                         unsigned int which)
 121 {
 122         BUG_ON(which >= osd_req->r_num_ops);
 123
 124         return &osd_req->r_ops[which].extent.osd_data;
 125 }
 126 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
 127
 128 struct ceph_osd_data *
 129 osd_req_op_cls_request_info(struct ceph_osd_request *osd_req,
 130                         unsigned int which)
 131 {
 132         BUG_ON(which >= osd_req->r_num_ops);
 133
 134         return &osd_req->r_ops[which].cls.request_info;
 135 }
 136 EXPORT_SYMBOL(osd_req_op_cls_request_info);     /* ??? */
 137
 138 struct ceph_osd_data *
 139 osd_req_op_cls_request_data(struct ceph_osd_request *osd_req,
 140                         unsigned int which)
 141 {
 142         BUG_ON(which >= osd_req->r_num_ops);
 143
 144         return &osd_req->r_ops[which].cls.request_data;
 145 }
 146 EXPORT_SYMBOL(osd_req_op_cls_request_data);     /* ??? */
 147
 148 struct ceph_osd_data *
 149 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
 150                         unsigned int which)
 151 {
 152         BUG_ON(which >= osd_req->r_num_ops);
 153
 154         return &osd_req->r_ops[which].cls.response_data;
 155 }
 156 EXPORT_SYMBOL(osd_req_op_cls_response_data);    /* ??? */
 157
 158 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
 159                         unsigned int which, struct page **pages,
 160                         u64 length, u32 alignment,
 161                         bool pages_from_pool, bool own_pages)
 162 {
 163         struct ceph_osd_data *osd_data;
 164
 165         osd_data = osd_req_op_extent_osd_data(osd_req, which);
 166         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 167                                 pages_from_pool, own_pages);
 168 }
 169 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
 170
 171 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
 172                         unsigned int which, struct ceph_pagelist *pagelist)
 173 {
 174         struct ceph_osd_data *osd_data;
 175
 176         osd_data = osd_req_op_extent_osd_data(osd_req, which);
 177         ceph_osd_data_pagelist_init(osd_data, pagelist);
 178 }
 179 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
 180
 181 #ifdef CONFIG_BLOCK
 182 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
 183                         unsigned int which, struct bio *bio, size_t bio_length)
 184 {
 185         struct ceph_osd_data *osd_data;
 186         osd_data = osd_req_op_extent_osd_data(osd_req, which);
 187         ceph_osd_data_bio_init(osd_data, bio, bio_length);
 188 }
 189 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
 190 #endif /* CONFIG_BLOCK */
 191
 192 static void osd_req_op_cls_request_info_pagelist(
 193                         struct ceph_osd_request *osd_req,
 194                         unsigned int which, struct ceph_pagelist *pagelist)
 195 {
 196         struct ceph_osd_data *osd_data;
 197
 198         osd_data = osd_req_op_cls_request_info(osd_req, which);
 199         ceph_osd_data_pagelist_init(osd_data, pagelist);
 200 }
 201
 202 void osd_req_op_cls_request_data_pagelist(
 203                         struct ceph_osd_request *osd_req,
 204                         unsigned int which, struct ceph_pagelist *pagelist)
 205 {
 206         struct ceph_osd_data *osd_data;
 207
 208         osd_data = osd_req_op_cls_request_data(osd_req, which);
 209         ceph_osd_data_pagelist_init(osd_data, pagelist);
 210 }
 211 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
 212
 213 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
 214                         unsigned int which, struct page **pages, u64 length,
 215                         u32 alignment, bool pages_from_pool, bool own_pages)
 216 {
 217         struct ceph_osd_data *osd_data;
 218
 219         osd_data = osd_req_op_cls_response_data(osd_req, which);
 220         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 221                                 pages_from_pool, own_pages);
 222 }
 223 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
 224
 225 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
 226 {
 227         switch (osd_data->type) {
 228         case CEPH_OSD_DATA_TYPE_NONE:
 229                 return 0;
 230         case CEPH_OSD_DATA_TYPE_PAGES:
 231                 return osd_data->length;
 232         case CEPH_OSD_DATA_TYPE_PAGELIST:
 233                 return (u64)osd_data->pagelist->length;
 234 #ifdef CONFIG_BLOCK
 235         case CEPH_OSD_DATA_TYPE_BIO:
 236                 return (u64)osd_data->bio_length;
 237 #endif /* CONFIG_BLOCK */
 238         default:
 239                 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
 240                 return 0;
 241         }
 242 }
 243
 244
 245 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
 246 {
 247         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
 248                 int num_pages;
 249
 250                 num_pages = calc_pages_for((u64)osd_data->alignment,
 251                                                 (u64)osd_data->length);
 252                 ceph_release_page_vector(osd_data->pages, num_pages);
 253         }
 254         ceph_osd_data_init(osd_data);
 255 }
 256
 257 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
 258                         unsigned int which)
 259 {
 260         struct ceph_osd_req_op *op;
 261
 262         BUG_ON(which >= osd_req->r_num_ops);
 263         op = &osd_req->r_ops[which];
 264
 265         switch (op->op) {
 266         case CEPH_OSD_OP_READ:
 267         case CEPH_OSD_OP_WRITE:
 268                 ceph_osd_data_release(&op->extent.osd_data);
 269                 break;
 270         case CEPH_OSD_OP_CALL:
 271                 ceph_osd_data_release(&op->cls.request_info);
 272                 ceph_osd_data_release(&op->cls.request_data);
 273                 ceph_osd_data_release(&op->cls.response_data);
 274                 break;
 275         default:
 276                 break;
 277         }
 278 }
 279
 280 /*
 281  * requests
 282  */
 283 void ceph_osdc_release_request(struct kref *kref)
 284 {
 285         struct ceph_osd_request *req;
 286         unsigned int which;
 287
 288         req = container_of(kref, struct ceph_osd_request, r_kref);
 289         if (req->r_request)
 290                 ceph_msg_put(req->r_request);
 291         if (req->r_reply) {
 292                 ceph_msg_revoke_incoming(req->r_reply);
 293                 ceph_msg_put(req->r_reply);
 294         }
 295
 296         for (which = 0; which < req->r_num_ops; which++)
 297                 osd_req_op_data_release(req, which);
 298
 299         ceph_put_snap_context(req->r_snapc);
 300         if (req->r_mempool)
 301                 mempool_free(req, req->r_osdc->req_mempool);
 302         else
 303                 kfree(req);
 304 }
 305 EXPORT_SYMBOL(ceph_osdc_release_request);
 306
 307 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 308                                                struct ceph_snap_context *snapc,
 309                                                unsigned int num_ops,
 310                                                bool use_mempool,
 311                                                gfp_t gfp_flags)
 312 {
 313         struct ceph_osd_request *req;
 314         struct ceph_msg *msg;
 315         size_t msg_size;
 316
 317         BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
 318         BUG_ON(num_ops > CEPH_OSD_MAX_OP);
 319
 320         msg_size = 4 + 4 + 8 + 8 + 4+8;
 321         msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
 322         msg_size += 1 + 8 + 4 + 4;     /* pg_t */
 323         msg_size += 4 + MAX_OBJ_NAME_SIZE;
 324         msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
 325         msg_size += 8;  /* snapid */
 326         msg_size += 8;  /* snap_seq */
 327         msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
 328         msg_size += 4;
 329
 330         if (use_mempool) {
 331                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 332                 memset(req, 0, sizeof(*req));
 333         } else {
 334                 req = kzalloc(sizeof(*req), gfp_flags);
 335         }
 336         if (req == NULL)
 337                 return NULL;
 338
 339         req->r_osdc = osdc;
 340         req->r_mempool = use_mempool;
 341         req->r_num_ops = num_ops;
 342
 343         kref_init(&req->r_kref);
 344         init_completion(&req->r_completion);
 345         init_completion(&req->r_safe_completion);
 346         RB_CLEAR_NODE(&req->r_node);
 347         INIT_LIST_HEAD(&req->r_unsafe_item);
 348         INIT_LIST_HEAD(&req->r_linger_item);
 349         INIT_LIST_HEAD(&req->r_linger_osd);
 350         INIT_LIST_HEAD(&req->r_req_lru_item);
 351         INIT_LIST_HEAD(&req->r_osd_item);
 352
 353         /* create reply message */
 354         if (use_mempool)
 355                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 356         else
 357                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 358                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 359         if (!msg) {
 360                 ceph_osdc_put_request(req);
 361                 return NULL;
 362         }
 363         req->r_reply = msg;
 364
 365         /* create request message; allow space for oid */
 366         if (use_mempool)
 367                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 368         else
 369                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 370         if (!msg) {
 371                 ceph_osdc_put_request(req);
 372                 return NULL;
 373         }
 374
 375         memset(msg->front.iov_base, 0, msg->front.iov_len);
 376
 377         req->r_request = msg;
 378
 379         return req;
 380 }
 381 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 382
 383 static bool osd_req_opcode_valid(u16 opcode)
 384 {
 385         switch (opcode) {
 386         case CEPH_OSD_OP_READ:
 387         case CEPH_OSD_OP_STAT:
 388         case CEPH_OSD_OP_MAPEXT:
 389         case CEPH_OSD_OP_MASKTRUNC:
 390         case CEPH_OSD_OP_SPARSE_READ:
 391         case CEPH_OSD_OP_NOTIFY:
 392         case CEPH_OSD_OP_NOTIFY_ACK:
 393         case CEPH_OSD_OP_ASSERT_VER:
 394         case CEPH_OSD_OP_WRITE:
 395         case CEPH_OSD_OP_WRITEFULL:
 396         case CEPH_OSD_OP_TRUNCATE:
 397         case CEPH_OSD_OP_ZERO:
 398         case CEPH_OSD_OP_DELETE:
 399         case CEPH_OSD_OP_APPEND:
 400         case CEPH_OSD_OP_STARTSYNC:
 401         case CEPH_OSD_OP_SETTRUNC:
 402         case CEPH_OSD_OP_TRIMTRUNC:
 403         case CEPH_OSD_OP_TMAPUP:
 404         case CEPH_OSD_OP_TMAPPUT:
 405         case CEPH_OSD_OP_TMAPGET:
 406         case CEPH_OSD_OP_CREATE:
 407         case CEPH_OSD_OP_ROLLBACK:
 408         case CEPH_OSD_OP_WATCH:
 409         case CEPH_OSD_OP_OMAPGETKEYS:
 410         case CEPH_OSD_OP_OMAPGETVALS:
 411         case CEPH_OSD_OP_OMAPGETHEADER:
 412         case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
 413         case CEPH_OSD_OP_OMAPSETVALS:
 414         case CEPH_OSD_OP_OMAPSETHEADER:
 415         case CEPH_OSD_OP_OMAPCLEAR:
 416         case CEPH_OSD_OP_OMAPRMKEYS:
 417         case CEPH_OSD_OP_OMAP_CMP:
 418         case CEPH_OSD_OP_CLONERANGE:
 419         case CEPH_OSD_OP_ASSERT_SRC_VERSION:
 420         case CEPH_OSD_OP_SRC_CMPXATTR:
 421         case CEPH_OSD_OP_GETXATTR:
 422         case CEPH_OSD_OP_GETXATTRS:
 423         case CEPH_OSD_OP_CMPXATTR:
 424         case CEPH_OSD_OP_SETXATTR:
 425         case CEPH_OSD_OP_SETXATTRS:
 426         case CEPH_OSD_OP_RESETXATTRS:
 427         case CEPH_OSD_OP_RMXATTR:
 428         case CEPH_OSD_OP_PULL:
 429         case CEPH_OSD_OP_PUSH:
 430         case CEPH_OSD_OP_BALANCEREADS:
 431         case CEPH_OSD_OP_UNBALANCEREADS:
 432         case CEPH_OSD_OP_SCRUB:
 433         case CEPH_OSD_OP_SCRUB_RESERVE:
 434         case CEPH_OSD_OP_SCRUB_UNRESERVE:
 435         case CEPH_OSD_OP_SCRUB_STOP:
 436         case CEPH_OSD_OP_SCRUB_MAP:
 437         case CEPH_OSD_OP_WRLOCK:
 438         case CEPH_OSD_OP_WRUNLOCK:
 439         case CEPH_OSD_OP_RDLOCK:
 440         case CEPH_OSD_OP_RDUNLOCK:
 441         case CEPH_OSD_OP_UPLOCK:
 442         case CEPH_OSD_OP_DNLOCK:
 443         case CEPH_OSD_OP_CALL:
 444         case CEPH_OSD_OP_PGLS:
 445         case CEPH_OSD_OP_PGLS_FILTER:
 446                 return true;
 447         default:
 448                 return false;
 449         }
 450 }
 451
 452 /*
 453  * This is an osd op init function for opcodes that have no data or
 454  * other information associated with them.  It also serves as a
 455  * common init routine for all the other init functions, below.
 456  */
 457 static struct ceph_osd_req_op *
 458 osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
 459                                 u16 opcode)
 460 {
 461         struct ceph_osd_req_op *op;
 462
 463         BUG_ON(which >= osd_req->r_num_ops);
 464         BUG_ON(!osd_req_opcode_valid(opcode));
 465
 466         op = &osd_req->r_ops[which];
 467         memset(op, 0, sizeof (*op));
 468         op->op = opcode;
 469
 470         return op;
 471 }
 472
 473 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 474                                 unsigned int which, u16 opcode,
 475                                 u64 offset, u64 length,
 476                                 u64 truncate_size, u32 truncate_seq)
 477 {
 478         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which, opcode);
 479         size_t payload_len = 0;
 480
 481         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
 482
 483         op->extent.offset = offset;
 484         op->extent.length = length;
 485         op->extent.truncate_size = truncate_size;
 486         op->extent.truncate_seq = truncate_seq;
 487         if (opcode == CEPH_OSD_OP_WRITE)
 488                 payload_len += length;
 489
 490         op->payload_len = payload_len;
 491 }
 492 EXPORT_SYMBOL(osd_req_op_extent_init);
 493
 494 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 495                                 unsigned int which, u64 length)
 496 {
 497         struct ceph_osd_req_op *op;
 498         u64 previous;
 499
 500         BUG_ON(which >= osd_req->r_num_ops);
 501         op = &osd_req->r_ops[which];
 502         previous = op->extent.length;
 503
 504         if (length == previous)
 505                 return;         /* Nothing to do */
 506         BUG_ON(length > previous);
 507
 508         op->extent.length = length;
 509         op->payload_len -= previous - length;
 510 }
 511 EXPORT_SYMBOL(osd_req_op_extent_update);
 512
 513 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
 514                         u16 opcode, const char *class, const char *method)
 515 {
 516         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which, opcode);
 517         struct ceph_pagelist *pagelist;
 518         size_t payload_len = 0;
 519         size_t size;
 520
 521         BUG_ON(opcode != CEPH_OSD_OP_CALL);
 522
 523         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
 524         BUG_ON(!pagelist);
 525         ceph_pagelist_init(pagelist);
 526
 527         op->cls.class_name = class;
 528         size = strlen(class);
 529         BUG_ON(size > (size_t) U8_MAX);
 530         op->cls.class_len = size;
 531         ceph_pagelist_append(pagelist, class, size);
 532         payload_len += size;
 533
 534         op->cls.method_name = method;
 535         size = strlen(method);
 536         BUG_ON(size > (size_t) U8_MAX);
 537         op->cls.method_len = size;
 538         ceph_pagelist_append(pagelist, method, size);
 539         payload_len += size;
 540
 541         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
 542
 543         op->cls.argc = 0;       /* currently unused */
 544
 545         op->payload_len = payload_len;
 546 }
 547 EXPORT_SYMBOL(osd_req_op_cls_init);
 548
 549 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 550                                 unsigned int which, u16 opcode,
 551                                 u64 cookie, u64 version, int flag)
 552 {
 553         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which, opcode);
 554
 555         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
 556
 557         op->watch.cookie = cookie;
 558         /* op->watch.ver = version; */  /* XXX 3847 */
 559         op->watch.ver = cpu_to_le64(version);
 560         if (opcode == CEPH_OSD_OP_WATCH && flag)
 561                 op->watch.flag = (u8)1;
 562 }
 563 EXPORT_SYMBOL(osd_req_op_watch_init);
 564
 565 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 566                                 struct ceph_osd_data *osd_data)
 567 {
 568         u64 length = ceph_osd_data_length(osd_data);
 569
 570         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 571                 BUG_ON(length > (u64) SIZE_MAX);
 572                 if (length)
 573                         ceph_msg_data_add_pages(msg, osd_data->pages,
 574                                         length, osd_data->alignment);
 575         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
 576                 BUG_ON(!length);
 577                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
 578 #ifdef CONFIG_BLOCK
 579         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
 580                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
 581 #endif
 582         } else {
 583                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
 584         }
 585 }
 586
 587 static u64 osd_req_encode_op(struct ceph_osd_request *req,
 588                               struct ceph_osd_op *dst, unsigned int which)
 589 {
 590         struct ceph_osd_req_op *src;
 591         struct ceph_osd_data *osd_data;
 592         u64 request_data_len = 0;
 593         u64 data_length;
 594
 595         BUG_ON(which >= req->r_num_ops);
 596         src = &req->r_ops[which];
 597         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
 598                 pr_err("unrecognized osd opcode %d\n", src->op);
 599
 600                 return 0;
 601         }
 602
 603         switch (src->op) {
 604         case CEPH_OSD_OP_STAT:
 605                 break;
 606         case CEPH_OSD_OP_READ:
 607         case CEPH_OSD_OP_WRITE:
 608                 if (src->op == CEPH_OSD_OP_WRITE)
 609                         request_data_len = src->extent.length;
 610                 dst->extent.offset = cpu_to_le64(src->extent.offset);
 611                 dst->extent.length = cpu_to_le64(src->extent.length);
 612                 dst->extent.truncate_size =
 613                         cpu_to_le64(src->extent.truncate_size);
 614                 dst->extent.truncate_seq =
 615                         cpu_to_le32(src->extent.truncate_seq);
 616                 osd_data = &src->extent.osd_data;
 617                 if (src->op == CEPH_OSD_OP_WRITE)
 618                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 619                 else
 620                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
 621                 break;
 622         case CEPH_OSD_OP_CALL:
 623                 dst->cls.class_len = src->cls.class_len;
 624                 dst->cls.method_len = src->cls.method_len;
 625                 osd_data = &src->cls.request_info;
 626                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 627                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
 628                 request_data_len = osd_data->pagelist->length;
 629
 630                 osd_data = &src->cls.request_data;
 631                 data_length = ceph_osd_data_length(osd_data);
 632                 if (data_length) {
 633                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
 634                         dst->cls.indata_len = cpu_to_le32(data_length);
 635                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 636                         src->payload_len += data_length;
 637                         request_data_len += data_length;
 638                 }
 639                 osd_data = &src->cls.response_data;
 640                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 641                 break;
 642         case CEPH_OSD_OP_STARTSYNC:
 643                 break;
 644         case CEPH_OSD_OP_NOTIFY_ACK:
 645         case CEPH_OSD_OP_WATCH:
 646                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 647                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 648                 dst->watch.flag = src->watch.flag;
 649                 break;
 650         default:
 651                 pr_err("unsupported osd opcode %s\n",
 652                         ceph_osd_op_name(src->op));
 653                 WARN_ON(1);
 654
 655                 return 0;
 656         }
 657         dst->op = cpu_to_le16(src->op);
 658         dst->payload_len = cpu_to_le32(src->payload_len);
 659
 660         return request_data_len;
 661 }
 662
 663 /*
 664  * build new request AND message, calculate layout, and adjust file
 665  * extent as needed.
 666  *
 667  * if the file was recently truncated, we include information about its
 668  * old and new size so that the object can be updated appropriately.  (we
 669  * avoid synchronously deleting truncated objects because it's slow.)
 670  *
 671  * if @do_sync, include a 'startsync' command so that the osd will flush
 672  * data quickly.
 673  */
 674 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 675                                                struct ceph_file_layout *layout,
 676                                                struct ceph_vino vino,
 677                                                u64 off, u64 *plen, int num_ops,
 678                                                int opcode, int flags,
 679                                                struct ceph_snap_context *snapc,
 680                                                u32 truncate_seq,
 681                                                u64 truncate_size,
 682                                                bool use_mempool)
 683 {
 684         struct ceph_osd_request *req;
 685         u64 objnum = 0;
 686         u64 objoff = 0;
 687         u64 objlen = 0;
 688         u32 object_size;
 689         u64 object_base;
 690         int r;
 691
 692         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
 693
 694         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
 695                                         GFP_NOFS);
 696         if (!req)
 697                 return ERR_PTR(-ENOMEM);
 698
 699         req->r_flags = flags;
 700
 701         /* calculate max write size */
 702         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
 703         if (r < 0) {
 704                 ceph_osdc_put_request(req);
 705                 return ERR_PTR(r);
 706         }
 707
 708         object_size = le32_to_cpu(layout->fl_object_size);
 709         object_base = off - objoff;
 710         if (truncate_size <= object_base) {
 711                 truncate_size = 0;
 712         } else {
 713                 truncate_size -= object_base;
 714                 if (truncate_size > object_size)
 715                         truncate_size = object_size;
 716         }
 717
 718         osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
 719                                 truncate_size, truncate_seq);
 720
 721         /*
 722          * A second op in the ops array means the caller wants to
 723          * also issue a include a 'startsync' command so that the
 724          * osd will flush data quickly.
 725          */
 726         if (num_ops > 1)
 727                 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
 728
 729         req->r_file_layout = *layout;  /* keep a copy */
 730
 731         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
 732                 vino.ino, objnum);
 733         req->r_oid_len = strlen(req->r_oid);
 734
 735         return req;
 736 }
 737 EXPORT_SYMBOL(ceph_osdc_new_request);
 738
 739 /*
 740  * We keep osd requests in an rbtree, sorted by ->r_tid.
 741  */
 742 static void __insert_request(struct ceph_osd_client *osdc,
 743                              struct ceph_osd_request *new)
 744 {
 745         struct rb_node **p = &osdc->requests.rb_node;
 746         struct rb_node *parent = NULL;
 747         struct ceph_osd_request *req = NULL;
 748
 749         while (*p) {
 750                 parent = *p;
 751                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 752                 if (new->r_tid < req->r_tid)
 753                         p = &(*p)->rb_left;
 754                 else if (new->r_tid > req->r_tid)
 755                         p = &(*p)->rb_right;
 756                 else
 757                         BUG();
 758         }
 759
 760         rb_link_node(&new->r_node, parent, p);
 761         rb_insert_color(&new->r_node, &osdc->requests);
 762 }
 763
 764 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 765                                                  u64 tid)
 766 {
 767         struct ceph_osd_request *req;
 768         struct rb_node *n = osdc->requests.rb_node;
 769
 770         while (n) {
 771                 req = rb_entry(n, struct ceph_osd_request, r_node);
 772                 if (tid < req->r_tid)
 773                         n = n->rb_left;
 774                 else if (tid > req->r_tid)
 775                         n = n->rb_right;
 776                 else
 777                         return req;
 778         }
 779         return NULL;
 780 }
 781
 782 static struct ceph_osd_request *
 783 __lookup_request_ge(struct ceph_osd_client *osdc,
 784                     u64 tid)
 785 {
 786         struct ceph_osd_request *req;
 787         struct rb_node *n = osdc->requests.rb_node;
 788
 789         while (n) {
 790                 req = rb_entry(n, struct ceph_osd_request, r_node);
 791                 if (tid < req->r_tid) {
 792                         if (!n->rb_left)
 793                                 return req;
 794                         n = n->rb_left;
 795                 } else if (tid > req->r_tid) {
 796                         n = n->rb_right;
 797                 } else {
 798                         return req;
 799                 }
 800         }
 801         return NULL;
 802 }
 803
 804 /*
 805  * Resubmit requests pending on the given osd.
 806  */
 807 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 808                                 struct ceph_osd *osd)
 809 {
 810         struct ceph_osd_request *req, *nreq;
 811         LIST_HEAD(resend);
 812         int err;
 813
 814         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 815         err = __reset_osd(osdc, osd);
 816         if (err)
 817                 return;
 818         /*
 819          * Build up a list of requests to resend by traversing the
 820          * osd's list of requests.  Requests for a given object are
 821          * sent in tid order, and that is also the order they're
 822          * kept on this list.  Therefore all requests that are in
 823          * flight will be found first, followed by all requests that
 824          * have not yet been sent.  And to resend requests while
 825          * preserving this order we will want to put any sent
 826          * requests back on the front of the osd client's unsent
 827          * list.
 828          *
 829          * So we build a separate ordered list of already-sent
 830          * requests for the affected osd and splice it onto the
 831          * front of the osd client's unsent list.  Once we've seen a
 832          * request that has not yet been sent we're done.  Those
 833          * requests are already sitting right where they belong.
 834          */
 835         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 836                 if (!req->r_sent)
 837                         break;
 838                 list_move_tail(&req->r_req_lru_item, &resend);
 839                 dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
 840                      osd->o_osd);
 841                 if (!req->r_linger)
 842                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 843         }
 844         list_splice(&resend, &osdc->req_unsent);
 845
 846         /*
 847          * Linger requests are re-registered before sending, which
 848          * sets up a new tid for each.  We add them to the unsent
 849          * list at the end to keep things in tid order.
 850          */
 851         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 852                                  r_linger_osd) {
 853                 /*
 854                  * reregister request prior to unregistering linger so
 855                  * that r_osd is preserved.
 856                  */
 857                 BUG_ON(!list_empty(&req->r_req_lru_item));
 858                 __register_request(osdc, req);
 859                 list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
 860                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
 861                 __unregister_linger_request(osdc, req);
 862                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 863                      osd->o_osd);
 864         }
 865 }
 866
 867 /*
 868  * If the osd connection drops, we need to resubmit all requests.
 869  */
 870 static void osd_reset(struct ceph_connection *con)
 871 {
 872         struct ceph_osd *osd = con->private;
 873         struct ceph_osd_client *osdc;
 874
 875         if (!osd)
 876                 return;
 877         dout("osd_reset osd%d\n", osd->o_osd);
 878         osdc = osd->o_osdc;
 879         down_read(&osdc->map_sem);
 880         mutex_lock(&osdc->request_mutex);
 881         __kick_osd_requests(osdc, osd);
 882         __send_queued(osdc);
 883         mutex_unlock(&osdc->request_mutex);
 884         up_read(&osdc->map_sem);
 885 }
 886
 887 /*
 888  * Track open sessions with osds.
 889  */
 890 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 891 {
 892         struct ceph_osd *osd;
 893
 894         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 895         if (!osd)
 896                 return NULL;
 897
 898         atomic_set(&osd->o_ref, 1);
 899         osd->o_osdc = osdc;
 900         osd->o_osd = onum;
 901         RB_CLEAR_NODE(&osd->o_node);
 902         INIT_LIST_HEAD(&osd->o_requests);
 903         INIT_LIST_HEAD(&osd->o_linger_requests);
 904         INIT_LIST_HEAD(&osd->o_osd_lru);
 905         osd->o_incarnation = 1;
 906
 907         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
 908
 909         INIT_LIST_HEAD(&osd->o_keepalive_item);
 910         return osd;
 911 }
 912
 913 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 914 {
 915         if (atomic_inc_not_zero(&osd->o_ref)) {
 916                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 917                      atomic_read(&osd->o_ref));
 918                 return osd;
 919         } else {
 920                 dout("get_osd %p FAIL\n", osd);
 921                 return NULL;
 922         }
 923 }
 924
 925 static void put_osd(struct ceph_osd *osd)
 926 {
 927         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 928              atomic_read(&osd->o_ref) - 1);
 929         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
 930                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 931
 932                 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
 933                 kfree(osd);
 934         }
 935 }
 936
 937 /*
 938  * remove an osd from our map
 939  */
 940 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 941 {
 942         dout("__remove_osd %p\n", osd);
 943         BUG_ON(!list_empty(&osd->o_requests));
 944         rb_erase(&osd->o_node, &osdc->osds);
 945         list_del_init(&osd->o_osd_lru);
 946         ceph_con_close(&osd->o_con);
 947         put_osd(osd);
 948 }
 949
 950 static void remove_all_osds(struct ceph_osd_client *osdc)
 951 {
 952         dout("%s %p\n", __func__, osdc);
 953         mutex_lock(&osdc->request_mutex);
 954         while (!RB_EMPTY_ROOT(&osdc->osds)) {
 955                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
 956                                                 struct ceph_osd, o_node);
 957                 __remove_osd(osdc, osd);
 958         }
 959         mutex_unlock(&osdc->request_mutex);
 960 }
 961
 962 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 963                               struct ceph_osd *osd)
 964 {
 965         dout("__move_osd_to_lru %p\n", osd);
 966         BUG_ON(!list_empty(&osd->o_osd_lru));
 967         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 968         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
 969 }
 970
 971 static void __remove_osd_from_lru(struct ceph_osd *osd)
 972 {
 973         dout("__remove_osd_from_lru %p\n", osd);
 974         if (!list_empty(&osd->o_osd_lru))
 975                 list_del_init(&osd->o_osd_lru);
 976 }
 977
 978 static void remove_old_osds(struct ceph_osd_client *osdc)
 979 {
 980         struct ceph_osd *osd, *nosd;
 981
 982         dout("__remove_old_osds %p\n", osdc);
 983         mutex_lock(&osdc->request_mutex);
 984         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 985                 if (time_before(jiffies, osd->lru_ttl))
 986                         break;
 987                 __remove_osd(osdc, osd);
 988         }
 989         mutex_unlock(&osdc->request_mutex);
 990 }
 991
 992 /*
 993  * reset osd connect
 994  */
 995 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 996 {
 997         struct ceph_entity_addr *peer_addr;
 998
 999         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1000         if (list_empty(&osd->o_requests) &&
1001             list_empty(&osd->o_linger_requests)) {
1002                 __remove_osd(osdc, osd);
1003
1004                 return -ENODEV;
1005         }
1006
1007         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1008         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1009                         !ceph_con_opened(&osd->o_con)) {
1010                 struct ceph_osd_request *req;
1011
1012                 dout(" osd addr hasn't changed and connection never opened,"
1013                      " letting msgr retry");
1014                 /* touch each r_stamp for handle_timeout()'s benfit */
1015                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1016                         req->r_stamp = jiffies;
1017
1018                 return -EAGAIN;
1019         }
1020
1021         ceph_con_close(&osd->o_con);
1022         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1023         osd->o_incarnation++;
1024
1025         return 0;
1026 }
1027
1028 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1029 {
1030         struct rb_node **p = &osdc->osds.rb_node;
1031         struct rb_node *parent = NULL;
1032         struct ceph_osd *osd = NULL;
1033
1034         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1035         while (*p) {
1036                 parent = *p;
1037                 osd = rb_entry(parent, struct ceph_osd, o_node);
1038                 if (new->o_osd < osd->o_osd)
1039                         p = &(*p)->rb_left;
1040                 else if (new->o_osd > osd->o_osd)
1041                         p = &(*p)->rb_right;
1042                 else
1043                         BUG();
1044         }
1045
1046         rb_link_node(&new->o_node, parent, p);
1047         rb_insert_color(&new->o_node, &osdc->osds);
1048 }
1049
1050 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1051 {
1052         struct ceph_osd *osd;
1053         struct rb_node *n = osdc->osds.rb_node;
1054
1055         while (n) {
1056                 osd = rb_entry(n, struct ceph_osd, o_node);
1057                 if (o < osd->o_osd)
1058                         n = n->rb_left;
1059                 else if (o > osd->o_osd)
1060                         n = n->rb_right;
1061                 else
1062                         return osd;
1063         }
1064         return NULL;
1065 }
1066
1067 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1068 {
1069         schedule_delayed_work(&osdc->timeout_work,
1070                         osdc->client->options->osd_keepalive_timeout * HZ);
1071 }
1072
1073 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1074 {
1075         cancel_delayed_work(&osdc->timeout_work);
1076 }
1077
1078 /*
1079  * Register request, assign tid.  If this is the first request, set up
1080  * the timeout event.
1081  */
1082 static void __register_request(struct ceph_osd_client *osdc,
1083                                struct ceph_osd_request *req)
1084 {
1085         req->r_tid = ++osdc->last_tid;
1086         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1087         dout("__register_request %p tid %lld\n", req, req->r_tid);
1088         __insert_request(osdc, req);
1089         ceph_osdc_get_request(req);
1090         osdc->num_requests++;
1091         if (osdc->num_requests == 1) {
1092                 dout(" first request, scheduling timeout\n");
1093                 __schedule_osd_timeout(osdc);
1094         }
1095 }
1096
1097 /*
1098  * called under osdc->request_mutex
1099  */
1100 static void __unregister_request(struct ceph_osd_client *osdc,
1101                                  struct ceph_osd_request *req)
1102 {
1103         if (RB_EMPTY_NODE(&req->r_node)) {
1104                 dout("__unregister_request %p tid %lld not registered\n",
1105                         req, req->r_tid);
1106                 return;
1107         }
1108
1109         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1110         rb_erase(&req->r_node, &osdc->requests);
1111         osdc->num_requests--;
1112
1113         if (req->r_osd) {
1114                 /* make sure the original request isn't in flight. */
1115                 ceph_msg_revoke(req->r_request);
1116
1117                 list_del_init(&req->r_osd_item);
1118                 if (list_empty(&req->r_osd->o_requests) &&
1119                     list_empty(&req->r_osd->o_linger_requests)) {
1120                         dout("moving osd to %p lru\n", req->r_osd);
1121                         __move_osd_to_lru(osdc, req->r_osd);
1122                 }
1123                 if (list_empty(&req->r_linger_item))
1124                         req->r_osd = NULL;
1125         }
1126
1127         list_del_init(&req->r_req_lru_item);
1128         ceph_osdc_put_request(req);
1129
1130         if (osdc->num_requests == 0) {
1131                 dout(" no requests, canceling timeout\n");
1132                 __cancel_osd_timeout(osdc);
1133         }
1134 }
1135
1136 /*
1137  * Cancel a previously queued request message
1138  */
1139 static void __cancel_request(struct ceph_osd_request *req)
1140 {
1141         if (req->r_sent && req->r_osd) {
1142                 ceph_msg_revoke(req->r_request);
1143                 req->r_sent = 0;
1144         }
1145 }
1146
1147 static void __register_linger_request(struct ceph_osd_client *osdc,
1148                                     struct ceph_osd_request *req)
1149 {
1150         dout("__register_linger_request %p\n", req);
1151         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1152         if (req->r_osd)
1153                 list_add_tail(&req->r_linger_osd,
1154                               &req->r_osd->o_linger_requests);
1155 }
1156
1157 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1158                                         struct ceph_osd_request *req)
1159 {
1160         dout("__unregister_linger_request %p\n", req);
1161         list_del_init(&req->r_linger_item);
1162         if (req->r_osd) {
1163                 list_del_init(&req->r_linger_osd);
1164
1165                 if (list_empty(&req->r_osd->o_requests) &&
1166                     list_empty(&req->r_osd->o_linger_requests)) {
1167                         dout("moving osd to %p lru\n", req->r_osd);
1168                         __move_osd_to_lru(osdc, req->r_osd);
1169                 }
1170                 if (list_empty(&req->r_osd_item))
1171                         req->r_osd = NULL;
1172         }
1173 }
1174
1175 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
1176                                          struct ceph_osd_request *req)
1177 {
1178         mutex_lock(&osdc->request_mutex);
1179         if (req->r_linger) {
1180                 __unregister_linger_request(osdc, req);
1181                 ceph_osdc_put_request(req);
1182         }
1183         mutex_unlock(&osdc->request_mutex);
1184 }
1185 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
1186
1187 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1188                                   struct ceph_osd_request *req)
1189 {
1190         if (!req->r_linger) {
1191                 dout("set_request_linger %p\n", req);
1192                 req->r_linger = 1;
1193                 /*
1194                  * caller is now responsible for calling
1195                  * unregister_linger_request
1196                  */
1197                 ceph_osdc_get_request(req);
1198         }
1199 }
1200 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1201
1202 /*
1203  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1204  * (as needed), and set the request r_osd appropriately.  If there is
1205  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1206  * (unsent, homeless) or leave on in-flight lru.
1207  *
1208  * Return 0 if unchanged, 1 if changed, or negative on error.
1209  *
1210  * Caller should hold map_sem for read and request_mutex.
1211  */
1212 static int __map_request(struct ceph_osd_client *osdc,
1213                          struct ceph_osd_request *req, int force_resend)
1214 {
1215         struct ceph_pg pgid;
1216         int acting[CEPH_PG_MAX_SIZE];
1217         int o = -1, num = 0;
1218         int err;
1219
1220         dout("map_request %p tid %lld\n", req, req->r_tid);
1221         err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
1222                                 ceph_file_layout_pg_pool(req->r_file_layout));
1223         if (err) {
1224                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1225                 return err;
1226         }
1227         req->r_pgid = pgid;
1228
1229         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
1230         if (err > 0) {
1231                 o = acting[0];
1232                 num = err;
1233         }
1234
1235         if ((!force_resend &&
1236              req->r_osd && req->r_osd->o_osd == o &&
1237              req->r_sent >= req->r_osd->o_incarnation &&
1238              req->r_num_pg_osds == num &&
1239              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1240             (req->r_osd == NULL && o == -1))
1241                 return 0;  /* no change */
1242
1243         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1244              req->r_tid, pgid.pool, pgid.seed, o,
1245              req->r_osd ? req->r_osd->o_osd : -1);
1246
1247         /* record full pg acting set */
1248         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1249         req->r_num_pg_osds = num;
1250
1251         if (req->r_osd) {
1252                 __cancel_request(req);
1253                 list_del_init(&req->r_osd_item);
1254                 req->r_osd = NULL;
1255         }
1256
1257         req->r_osd = __lookup_osd(osdc, o);
1258         if (!req->r_osd && o >= 0) {
1259                 err = -ENOMEM;
1260                 req->r_osd = create_osd(osdc, o);
1261                 if (!req->r_osd) {
1262                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1263                         goto out;
1264                 }
1265
1266                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1267                 __insert_osd(osdc, req->r_osd);
1268
1269                 ceph_con_open(&req->r_osd->o_con,
1270                               CEPH_ENTITY_TYPE_OSD, o,
1271                               &osdc->osdmap->osd_addr[o]);
1272         }
1273
1274         if (req->r_osd) {
1275                 __remove_osd_from_lru(req->r_osd);
1276                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1277                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1278         } else {
1279                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1280         }
1281         err = 1;   /* osd or pg changed */
1282
1283 out:
1284         return err;
1285 }
1286
1287 /*
1288  * caller should hold map_sem (for read) and request_mutex
1289  */
1290 static void __send_request(struct ceph_osd_client *osdc,
1291                            struct ceph_osd_request *req)
1292 {
1293         void *p;
1294
1295         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1296              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1297              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1298
1299         /* fill in message content that changes each time we send it */
1300         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1301         put_unaligned_le32(req->r_flags, req->r_request_flags);
1302         put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
1303         p = req->r_request_pgid;
1304         ceph_encode_64(&p, req->r_pgid.pool);
1305         ceph_encode_32(&p, req->r_pgid.seed);
1306         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1307         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1308                sizeof(req->r_reassert_version));
1309
1310         req->r_stamp = jiffies;
1311         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1312
1313         ceph_msg_get(req->r_request); /* send consumes a ref */
1314
1315         /* Mark the request unsafe if this is the first timet's being sent. */
1316
1317         if (!req->r_sent && req->r_unsafe_callback)
1318                 req->r_unsafe_callback(req, true);
1319         req->r_sent = req->r_osd->o_incarnation;
1320
1321         ceph_con_send(&req->r_osd->o_con, req->r_request);
1322 }
1323
1324 /*
1325  * Send any requests in the queue (req_unsent).
1326  */
1327 static void __send_queued(struct ceph_osd_client *osdc)
1328 {
1329         struct ceph_osd_request *req, *tmp;
1330
1331         dout("__send_queued\n");
1332         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1333                 __send_request(osdc, req);
1334 }
1335
1336 /*
1337  * Timeout callback, called every N seconds when 1 or more osd
1338  * requests has been active for more than N seconds.  When this
1339  * happens, we ping all OSDs with requests who have timed out to
1340  * ensure any communications channel reset is detected.  Reset the
1341  * request timeouts another N seconds in the future as we go.
1342  * Reschedule the timeout event another N seconds in future (unless
1343  * there are no open requests).
1344  */
1345 static void handle_timeout(struct work_struct *work)
1346 {
1347         struct ceph_osd_client *osdc =
1348                 container_of(work, struct ceph_osd_client, timeout_work.work);
1349         struct ceph_osd_request *req;
1350         struct ceph_osd *osd;
1351         unsigned long keepalive =
1352                 osdc->client->options->osd_keepalive_timeout * HZ;
1353         struct list_head slow_osds;
1354         dout("timeout\n");
1355         down_read(&osdc->map_sem);
1356
1357         ceph_monc_request_next_osdmap(&osdc->client->monc);
1358
1359         mutex_lock(&osdc->request_mutex);
1360
1361         /*
1362          * ping osds that are a bit slow.  this ensures that if there
1363          * is a break in the TCP connection we will notice, and reopen
1364          * a connection with that osd (from the fault callback).
1365          */
1366         INIT_LIST_HEAD(&slow_osds);
1367         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1368                 if (time_before(jiffies, req->r_stamp + keepalive))
1369                         break;
1370
1371                 osd = req->r_osd;
1372                 BUG_ON(!osd);
1373                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1374                      req->r_tid, osd->o_osd);
1375                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1376         }
1377         while (!list_empty(&slow_osds)) {
1378                 osd = list_entry(slow_osds.next, struct ceph_osd,
1379                                  o_keepalive_item);
1380                 list_del_init(&osd->o_keepalive_item);
1381                 ceph_con_keepalive(&osd->o_con);
1382         }
1383
1384         __schedule_osd_timeout(osdc);
1385         __send_queued(osdc);
1386         mutex_unlock(&osdc->request_mutex);
1387         up_read(&osdc->map_sem);
1388 }
1389
1390 static void handle_osds_timeout(struct work_struct *work)
1391 {
1392         struct ceph_osd_client *osdc =
1393                 container_of(work, struct ceph_osd_client,
1394                              osds_timeout_work.work);
1395         unsigned long delay =
1396                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1397
1398         dout("osds timeout\n");
1399         down_read(&osdc->map_sem);
1400         remove_old_osds(osdc);
1401         up_read(&osdc->map_sem);
1402
1403         schedule_delayed_work(&osdc->osds_timeout_work,
1404                               round_jiffies_relative(delay));
1405 }
1406
1407 static void complete_request(struct ceph_osd_request *req)
1408 {
1409         if (req->r_unsafe_callback)
1410                 req->r_unsafe_callback(req, false);
1411         complete_all(&req->r_safe_completion);  /* fsync waiter */
1412 }
1413
1414 /*
1415  * handle osd op reply.  either call the callback if it is specified,
1416  * or do the completion to wake up the waiting thread.
1417  */
1418 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1419                          struct ceph_connection *con)
1420 {
1421         void *p, *end;
1422         struct ceph_osd_request *req;
1423         u64 tid;
1424         int object_len;
1425         unsigned int numops;
1426         int payload_len, flags;
1427         s32 result;
1428         s32 retry_attempt;
1429         struct ceph_pg pg;
1430         int err;
1431         u32 reassert_epoch;
1432         u64 reassert_version;
1433         u32 osdmap_epoch;
1434         int already_completed;
1435         u32 bytes;
1436         unsigned int i;
1437
1438         tid = le64_to_cpu(msg->hdr.tid);
1439         dout("handle_reply %p tid %llu\n", msg, tid);
1440
1441         p = msg->front.iov_base;
1442         end = p + msg->front.iov_len;
1443
1444         ceph_decode_need(&p, end, 4, bad);
1445         object_len = ceph_decode_32(&p);
1446         ceph_decode_need(&p, end, object_len, bad);
1447         p += object_len;
1448
1449         err = ceph_decode_pgid(&p, end, &pg);
1450         if (err)
1451                 goto bad;
1452
1453         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1454         flags = ceph_decode_64(&p);
1455         result = ceph_decode_32(&p);
1456         reassert_epoch = ceph_decode_32(&p);
1457         reassert_version = ceph_decode_64(&p);
1458         osdmap_epoch = ceph_decode_32(&p);
1459
1460         /* lookup */
1461         mutex_lock(&osdc->request_mutex);
1462         req = __lookup_request(osdc, tid);
1463         if (req == NULL) {
1464                 dout("handle_reply tid %llu dne\n", tid);
1465                 goto bad_mutex;
1466         }
1467         ceph_osdc_get_request(req);
1468
1469         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1470              req, result);
1471
1472         ceph_decode_need(&p, end, 4, bad);
1473         numops = ceph_decode_32(&p);
1474         if (numops > CEPH_OSD_MAX_OP)
1475                 goto bad_put;
1476         if (numops != req->r_num_ops)
1477                 goto bad_put;
1478         payload_len = 0;
1479         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad);
1480         for (i = 0; i < numops; i++) {
1481                 struct ceph_osd_op *op = p;
1482                 int len;
1483
1484                 len = le32_to_cpu(op->payload_len);
1485                 req->r_reply_op_len[i] = len;
1486                 dout(" op %d has %d bytes\n", i, len);
1487                 payload_len += len;
1488                 p += sizeof(*op);
1489         }
1490         bytes = le32_to_cpu(msg->hdr.data_len);
1491         if (payload_len != bytes) {
1492                 pr_warning("sum of op payload lens %d != data_len %d",
1493                            payload_len, bytes);
1494                 goto bad_put;
1495         }
1496
1497         ceph_decode_need(&p, end, 4 + numops * 4, bad);
1498         retry_attempt = ceph_decode_32(&p);
1499         for (i = 0; i < numops; i++)
1500                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1501
1502         if (!req->r_got_reply) {
1503
1504                 req->r_result = result;
1505                 dout("handle_reply result %d bytes %d\n", req->r_result,
1506                      bytes);
1507                 if (req->r_result == 0)
1508                         req->r_result = bytes;
1509
1510                 /* in case this is a write and we need to replay, */
1511                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1512                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1513
1514                 req->r_got_reply = 1;
1515         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1516                 dout("handle_reply tid %llu dup ack\n", tid);
1517                 mutex_unlock(&osdc->request_mutex);
1518                 goto done;
1519         }
1520
1521         dout("handle_reply tid %llu flags %d\n", tid, flags);
1522
1523         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1524                 __register_linger_request(osdc, req);
1525
1526         /* either this is a read, or we got the safe response */
1527         if (result < 0 ||
1528             (flags & CEPH_OSD_FLAG_ONDISK) ||
1529             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1530                 __unregister_request(osdc, req);
1531
1532         already_completed = req->r_completed;
1533         req->r_completed = 1;
1534         mutex_unlock(&osdc->request_mutex);
1535         if (already_completed)
1536                 goto done;
1537
1538         if (req->r_callback)
1539                 req->r_callback(req, msg);
1540         else
1541                 complete_all(&req->r_completion);
1542
1543         if (flags & CEPH_OSD_FLAG_ONDISK)
1544                 complete_request(req);
1545
1546 done:
1547         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1548         ceph_osdc_put_request(req);
1549         return;
1550
1551 bad_put:
1552         ceph_osdc_put_request(req);
1553 bad_mutex:
1554         mutex_unlock(&osdc->request_mutex);
1555 bad:
1556         pr_err("corrupt osd_op_reply got %d %d\n",
1557                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1558         ceph_msg_dump(msg);
1559 }
1560
1561 static void reset_changed_osds(struct ceph_osd_client *osdc)
1562 {
1563         struct rb_node *p, *n;
1564
1565         for (p = rb_first(&osdc->osds); p; p = n) {
1566                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1567
1568                 n = rb_next(p);
1569                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1570                     memcmp(&osd->o_con.peer_addr,
1571                            ceph_osd_addr(osdc->osdmap,
1572                                          osd->o_osd),
1573                            sizeof(struct ceph_entity_addr)) != 0)
1574                         __reset_osd(osdc, osd);
1575         }
1576 }
1577
1578 /*
1579  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1580  * no osd, request a new map.
1581  *
1582  * Caller should hold map_sem for read.
1583  */
1584 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1585 {
1586         struct ceph_osd_request *req, *nreq;
1587         struct rb_node *p;
1588         int needmap = 0;
1589         int err;
1590
1591         dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1592         mutex_lock(&osdc->request_mutex);
1593         for (p = rb_first(&osdc->requests); p; ) {
1594                 req = rb_entry(p, struct ceph_osd_request, r_node);
1595                 p = rb_next(p);
1596
1597                 /*
1598                  * For linger requests that have not yet been
1599                  * registered, move them to the linger list; they'll
1600                  * be sent to the osd in the loop below.  Unregister
1601                  * the request before re-registering it as a linger
1602                  * request to ensure the __map_request() below
1603                  * will decide it needs to be sent.
1604                  */
1605                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1606                         dout("%p tid %llu restart on osd%d\n",
1607                              req, req->r_tid,
1608                              req->r_osd ? req->r_osd->o_osd : -1);
1609                         __unregister_request(osdc, req);
1610                         __register_linger_request(osdc, req);
1611                         continue;
1612                 }
1613
1614                 err = __map_request(osdc, req, force_resend);
1615                 if (err < 0)
1616                         continue;  /* error */
1617                 if (req->r_osd == NULL) {
1618                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1619                         needmap++;  /* request a newer map */
1620                 } else if (err > 0) {
1621                         if (!req->r_linger) {
1622                                 dout("%p tid %llu requeued on osd%d\n", req,
1623                                      req->r_tid,
1624                                      req->r_osd ? req->r_osd->o_osd : -1);
1625                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1626                         }
1627                 }
1628         }
1629
1630         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1631                                  r_linger_item) {
1632                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1633
1634                 err = __map_request(osdc, req, force_resend);
1635                 dout("__map_request returned %d\n", err);
1636                 if (err == 0)
1637                         continue;  /* no change and no osd was specified */
1638                 if (err < 0)
1639                         continue;  /* hrm! */
1640                 if (req->r_osd == NULL) {
1641                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1642                         needmap++;  /* request a newer map */
1643                         continue;
1644                 }
1645
1646                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1647                      req->r_osd ? req->r_osd->o_osd : -1);
1648                 __register_request(osdc, req);
1649                 __unregister_linger_request(osdc, req);
1650         }
1651         mutex_unlock(&osdc->request_mutex);
1652
1653         if (needmap) {
1654                 dout("%d requests for down osds, need new map\n", needmap);
1655                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1656         }
1657         reset_changed_osds(osdc);
1658 }
1659
1660
1661 /*
1662  * Process updated osd map.
1663  *
1664  * The message contains any number of incremental and full maps, normally
1665  * indicating some sort of topology change in the cluster.  Kick requests
1666  * off to different OSDs as needed.
1667  */
1668 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1669 {
1670         void *p, *end, *next;
1671         u32 nr_maps, maplen;
1672         u32 epoch;
1673         struct ceph_osdmap *newmap = NULL, *oldmap;
1674         int err;
1675         struct ceph_fsid fsid;
1676
1677         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1678         p = msg->front.iov_base;
1679         end = p + msg->front.iov_len;
1680
1681         /* verify fsid */
1682         ceph_decode_need(&p, end, sizeof(fsid), bad);
1683         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1684         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1685                 return;
1686
1687         down_write(&osdc->map_sem);
1688
1689         /* incremental maps */
1690         ceph_decode_32_safe(&p, end, nr_maps, bad);
1691         dout(" %d inc maps\n", nr_maps);
1692         while (nr_maps > 0) {
1693                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1694                 epoch = ceph_decode_32(&p);
1695                 maplen = ceph_decode_32(&p);
1696                 ceph_decode_need(&p, end, maplen, bad);
1697                 next = p + maplen;
1698                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1699                         dout("applying incremental map %u len %d\n",
1700                              epoch, maplen);
1701                         newmap = osdmap_apply_incremental(&p, next,
1702                                                           osdc->osdmap,
1703                                                           &osdc->client->msgr);
1704                         if (IS_ERR(newmap)) {
1705                                 err = PTR_ERR(newmap);
1706                                 goto bad;
1707                         }
1708                         BUG_ON(!newmap);
1709                         if (newmap != osdc->osdmap) {
1710                                 ceph_osdmap_destroy(osdc->osdmap);
1711                                 osdc->osdmap = newmap;
1712                         }
1713                         kick_requests(osdc, 0);
1714                 } else {
1715                         dout("ignoring incremental map %u len %d\n",
1716                              epoch, maplen);
1717                 }
1718                 p = next;
1719                 nr_maps--;
1720         }
1721         if (newmap)
1722                 goto done;
1723
1724         /* full maps */
1725         ceph_decode_32_safe(&p, end, nr_maps, bad);
1726         dout(" %d full maps\n", nr_maps);
1727         while (nr_maps) {
1728                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1729                 epoch = ceph_decode_32(&p);
1730                 maplen = ceph_decode_32(&p);
1731                 ceph_decode_need(&p, end, maplen, bad);
1732                 if (nr_maps > 1) {
1733                         dout("skipping non-latest full map %u len %d\n",
1734                              epoch, maplen);
1735                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1736                         dout("skipping full map %u len %d, "
1737                              "older than our %u\n", epoch, maplen,
1738                              osdc->osdmap->epoch);
1739                 } else {
1740                         int skipped_map = 0;
1741
1742                         dout("taking full map %u len %d\n", epoch, maplen);
1743                         newmap = osdmap_decode(&p, p+maplen);
1744                         if (IS_ERR(newmap)) {
1745                                 err = PTR_ERR(newmap);
1746                                 goto bad;
1747                         }
1748                         BUG_ON(!newmap);
1749                         oldmap = osdc->osdmap;
1750                         osdc->osdmap = newmap;
1751                         if (oldmap) {
1752                                 if (oldmap->epoch + 1 < newmap->epoch)
1753                                         skipped_map = 1;
1754                                 ceph_osdmap_destroy(oldmap);
1755                         }
1756                         kick_requests(osdc, skipped_map);
1757                 }
1758                 p += maplen;
1759                 nr_maps--;
1760         }
1761
1762 done:
1763         downgrade_write(&osdc->map_sem);
1764         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1765
1766         /*
1767          * subscribe to subsequent osdmap updates if full to ensure
1768          * we find out when we are no longer full and stop returning
1769          * ENOSPC.
1770          */
1771         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1772                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1773
1774         mutex_lock(&osdc->request_mutex);
1775         __send_queued(osdc);
1776         mutex_unlock(&osdc->request_mutex);
1777         up_read(&osdc->map_sem);
1778         wake_up_all(&osdc->client->auth_wq);
1779         return;
1780
1781 bad:
1782         pr_err("osdc handle_map corrupt msg\n");
1783         ceph_msg_dump(msg);
1784         up_write(&osdc->map_sem);
1785         return;
1786 }
1787
1788 /*
1789  * watch/notify callback event infrastructure
1790  *
1791  * These callbacks are used both for watch and notify operations.
1792  */
1793 static void __release_event(struct kref *kref)
1794 {
1795         struct ceph_osd_event *event =
1796                 container_of(kref, struct ceph_osd_event, kref);
1797
1798         dout("__release_event %p\n", event);
1799         kfree(event);
1800 }
1801
1802 static void get_event(struct ceph_osd_event *event)
1803 {
1804         kref_get(&event->kref);
1805 }
1806
1807 void ceph_osdc_put_event(struct ceph_osd_event *event)
1808 {
1809         kref_put(&event->kref, __release_event);
1810 }
1811 EXPORT_SYMBOL(ceph_osdc_put_event);
1812
1813 static void __insert_event(struct ceph_osd_client *osdc,
1814                              struct ceph_osd_event *new)
1815 {
1816         struct rb_node **p = &osdc->event_tree.rb_node;
1817         struct rb_node *parent = NULL;
1818         struct ceph_osd_event *event = NULL;
1819
1820         while (*p) {
1821                 parent = *p;
1822                 event = rb_entry(parent, struct ceph_osd_event, node);
1823                 if (new->cookie < event->cookie)
1824                         p = &(*p)->rb_left;
1825                 else if (new->cookie > event->cookie)
1826                         p = &(*p)->rb_right;
1827                 else
1828                         BUG();
1829         }
1830
1831         rb_link_node(&new->node, parent, p);
1832         rb_insert_color(&new->node, &osdc->event_tree);
1833 }
1834
1835 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1836                                                 u64 cookie)
1837 {
1838         struct rb_node **p = &osdc->event_tree.rb_node;
1839         struct rb_node *parent = NULL;
1840         struct ceph_osd_event *event = NULL;
1841
1842         while (*p) {
1843                 parent = *p;
1844                 event = rb_entry(parent, struct ceph_osd_event, node);
1845                 if (cookie < event->cookie)
1846                         p = &(*p)->rb_left;
1847                 else if (cookie > event->cookie)
1848                         p = &(*p)->rb_right;
1849                 else
1850                         return event;
1851         }
1852         return NULL;
1853 }
1854
1855 static void __remove_event(struct ceph_osd_event *event)
1856 {
1857         struct ceph_osd_client *osdc = event->osdc;
1858
1859         if (!RB_EMPTY_NODE(&event->node)) {
1860                 dout("__remove_event removed %p\n", event);
1861                 rb_erase(&event->node, &osdc->event_tree);
1862                 ceph_osdc_put_event(event);
1863         } else {
1864                 dout("__remove_event didn't remove %p\n", event);
1865         }
1866 }
1867
1868 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1869                            void (*event_cb)(u64, u64, u8, void *),
1870                            void *data, struct ceph_osd_event **pevent)
1871 {
1872         struct ceph_osd_event *event;
1873
1874         event = kmalloc(sizeof(*event), GFP_NOIO);
1875         if (!event)
1876                 return -ENOMEM;
1877
1878         dout("create_event %p\n", event);
1879         event->cb = event_cb;
1880         event->one_shot = 0;
1881         event->data = data;
1882         event->osdc = osdc;
1883         INIT_LIST_HEAD(&event->osd_node);
1884         RB_CLEAR_NODE(&event->node);
1885         kref_init(&event->kref);   /* one ref for us */
1886         kref_get(&event->kref);    /* one ref for the caller */
1887
1888         spin_lock(&osdc->event_lock);
1889         event->cookie = ++osdc->event_count;
1890         __insert_event(osdc, event);
1891         spin_unlock(&osdc->event_lock);
1892
1893         *pevent = event;
1894         return 0;
1895 }
1896 EXPORT_SYMBOL(ceph_osdc_create_event);
1897
1898 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1899 {
1900         struct ceph_osd_client *osdc = event->osdc;
1901
1902         dout("cancel_event %p\n", event);
1903         spin_lock(&osdc->event_lock);
1904         __remove_event(event);
1905         spin_unlock(&osdc->event_lock);
1906         ceph_osdc_put_event(event); /* caller's */
1907 }
1908 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1909
1910
1911 static void do_event_work(struct work_struct *work)
1912 {
1913         struct ceph_osd_event_work *event_work =
1914                 container_of(work, struct ceph_osd_event_work, work);
1915         struct ceph_osd_event *event = event_work->event;
1916         u64 ver = event_work->ver;
1917         u64 notify_id = event_work->notify_id;
1918         u8 opcode = event_work->opcode;
1919
1920         dout("do_event_work completing %p\n", event);
1921         event->cb(ver, notify_id, opcode, event->data);
1922         dout("do_event_work completed %p\n", event);
1923         ceph_osdc_put_event(event);
1924         kfree(event_work);
1925 }
1926
1927
1928 /*
1929  * Process osd watch notifications
1930  */
1931 static void handle_watch_notify(struct ceph_osd_client *osdc,
1932                                 struct ceph_msg *msg)
1933 {
1934         void *p, *end;
1935         u8 proto_ver;
1936         u64 cookie, ver, notify_id;
1937         u8 opcode;
1938         struct ceph_osd_event *event;
1939         struct ceph_osd_event_work *event_work;
1940
1941         p = msg->front.iov_base;
1942         end = p + msg->front.iov_len;
1943
1944         ceph_decode_8_safe(&p, end, proto_ver, bad);
1945         ceph_decode_8_safe(&p, end, opcode, bad);
1946         ceph_decode_64_safe(&p, end, cookie, bad);
1947         ceph_decode_64_safe(&p, end, ver, bad);
1948         ceph_decode_64_safe(&p, end, notify_id, bad);
1949
1950         spin_lock(&osdc->event_lock);
1951         event = __find_event(osdc, cookie);
1952         if (event) {
1953                 BUG_ON(event->one_shot);
1954                 get_event(event);
1955         }
1956         spin_unlock(&osdc->event_lock);
1957         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1958              cookie, ver, event);
1959         if (event) {
1960                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1961                 if (!event_work) {
1962                         dout("ERROR: could not allocate event_work\n");
1963                         goto done_err;
1964                 }
1965                 INIT_WORK(&event_work->work, do_event_work);
1966                 event_work->event = event;
1967                 event_work->ver = ver;
1968                 event_work->notify_id = notify_id;
1969                 event_work->opcode = opcode;
1970                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1971                         dout("WARNING: failed to queue notify event work\n");
1972                         goto done_err;
1973                 }
1974         }
1975
1976         return;
1977
1978 done_err:
1979         ceph_osdc_put_event(event);
1980         return;
1981
1982 bad:
1983         pr_err("osdc handle_watch_notify corrupt msg\n");
1984         return;
1985 }
1986
1987 /*
1988  * build new request AND message
1989  *
1990  */
1991 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
1992                                 struct ceph_snap_context *snapc, u64 snap_id,
1993                                 struct timespec *mtime)
1994 {
1995         struct ceph_msg *msg = req->r_request;
1996         void *p;
1997         size_t msg_size;
1998         int flags = req->r_flags;
1999         u64 data_len;
2000         unsigned int i;
2001
2002         req->r_snapid = snap_id;
2003         req->r_snapc = ceph_get_snap_context(snapc);
2004
2005         /* encode request */
2006         msg->hdr.version = cpu_to_le16(4);
2007
2008         p = msg->front.iov_base;
2009         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2010         req->r_request_osdmap_epoch = p;
2011         p += 4;
2012         req->r_request_flags = p;
2013         p += 4;
2014         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2015                 ceph_encode_timespec(p, mtime);
2016         p += sizeof(struct ceph_timespec);
2017         req->r_request_reassert_version = p;
2018         p += sizeof(struct ceph_eversion); /* will get filled in */
2019
2020         /* oloc */
2021         ceph_encode_8(&p, 4);
2022         ceph_encode_8(&p, 4);
2023         ceph_encode_32(&p, 8 + 4 + 4);
2024         req->r_request_pool = p;
2025         p += 8;
2026         ceph_encode_32(&p, -1);  /* preferred */
2027         ceph_encode_32(&p, 0);   /* key len */
2028
2029         ceph_encode_8(&p, 1);
2030         req->r_request_pgid = p;
2031         p += 8 + 4;
2032         ceph_encode_32(&p, -1);  /* preferred */
2033
2034         /* oid */
2035         ceph_encode_32(&p, req->r_oid_len);
2036         memcpy(p, req->r_oid, req->r_oid_len);
2037         dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
2038         p += req->r_oid_len;
2039
2040         /* ops--can imply data */
2041         ceph_encode_16(&p, (u16)req->r_num_ops);
2042         data_len = 0;
2043         for (i = 0; i < req->r_num_ops; i++) {
2044                 data_len += osd_req_encode_op(req, p, i);
2045                 p += sizeof(struct ceph_osd_op);
2046         }
2047
2048         /* snaps */
2049         ceph_encode_64(&p, req->r_snapid);
2050         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2051         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2052         if (req->r_snapc) {
2053                 for (i = 0; i < snapc->num_snaps; i++) {
2054                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2055                 }
2056         }
2057
2058         req->r_request_attempts = p;
2059         p += 4;
2060
2061         /* data */
2062         if (flags & CEPH_OSD_FLAG_WRITE) {
2063                 u16 data_off;
2064
2065                 /*
2066                  * The header "data_off" is a hint to the receiver
2067                  * allowing it to align received data into its
2068                  * buffers such that there's no need to re-copy
2069                  * it before writing it to disk (direct I/O).
2070                  */
2071                 data_off = (u16) (off & 0xffff);
2072                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2073         }
2074         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2075
2076         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2077         msg_size = p - msg->front.iov_base;
2078         msg->front.iov_len = msg_size;
2079         msg->hdr.front_len = cpu_to_le32(msg_size);
2080
2081         dout("build_request msg_size was %d\n", (int)msg_size);
2082 }
2083 EXPORT_SYMBOL(ceph_osdc_build_request);
2084
2085 /*
2086  * Register request, send initial attempt.
2087  */
2088 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2089                             struct ceph_osd_request *req,
2090                             bool nofail)
2091 {
2092         int rc = 0;
2093
2094         down_read(&osdc->map_sem);
2095         mutex_lock(&osdc->request_mutex);
2096         __register_request(osdc, req);
2097         WARN_ON(req->r_sent);
2098         rc = __map_request(osdc, req, 0);
2099         if (rc < 0) {
2100                 if (nofail) {
2101                         dout("osdc_start_request failed map, "
2102                                 " will retry %lld\n", req->r_tid);
2103                         rc = 0;
2104                 }
2105                 goto out_unlock;
2106         }
2107         if (req->r_osd == NULL) {
2108                 dout("send_request %p no up osds in pg\n", req);
2109                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2110         } else {
2111                 __send_queued(osdc);
2112         }
2113         rc = 0;
2114 out_unlock:
2115         mutex_unlock(&osdc->request_mutex);
2116         up_read(&osdc->map_sem);
2117         return rc;
2118 }
2119 EXPORT_SYMBOL(ceph_osdc_start_request);
2120
2121 /*
2122  * wait for a request to complete
2123  */
2124 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2125                            struct ceph_osd_request *req)
2126 {
2127         int rc;
2128
2129         rc = wait_for_completion_interruptible(&req->r_completion);
2130         if (rc < 0) {
2131                 mutex_lock(&osdc->request_mutex);
2132                 __cancel_request(req);
2133                 __unregister_request(osdc, req);
2134                 mutex_unlock(&osdc->request_mutex);
2135                 complete_request(req);
2136                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
2137                 return rc;
2138         }
2139
2140         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
2141         return req->r_result;
2142 }
2143 EXPORT_SYMBOL(ceph_osdc_wait_request);
2144
2145 /*
2146  * sync - wait for all in-flight requests to flush.  avoid starvation.
2147  */
2148 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2149 {
2150         struct ceph_osd_request *req;
2151         u64 last_tid, next_tid = 0;
2152
2153         mutex_lock(&osdc->request_mutex);
2154         last_tid = osdc->last_tid;
2155         while (1) {
2156                 req = __lookup_request_ge(osdc, next_tid);
2157                 if (!req)
2158                         break;
2159                 if (req->r_tid > last_tid)
2160                         break;
2161
2162                 next_tid = req->r_tid + 1;
2163                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2164                         continue;
2165
2166                 ceph_osdc_get_request(req);
2167                 mutex_unlock(&osdc->request_mutex);
2168                 dout("sync waiting on tid %llu (last is %llu)\n",
2169                      req->r_tid, last_tid);
2170                 wait_for_completion(&req->r_safe_completion);
2171                 mutex_lock(&osdc->request_mutex);
2172                 ceph_osdc_put_request(req);
2173         }
2174         mutex_unlock(&osdc->request_mutex);
2175         dout("sync done (thru tid %llu)\n", last_tid);
2176 }
2177 EXPORT_SYMBOL(ceph_osdc_sync);
2178
2179 /*
2180  * init, shutdown
2181  */
2182 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2183 {
2184         int err;
2185
2186         dout("init\n");
2187         osdc->client = client;
2188         osdc->osdmap = NULL;
2189         init_rwsem(&osdc->map_sem);
2190         init_completion(&osdc->map_waiters);
2191         osdc->last_requested_map = 0;
2192         mutex_init(&osdc->request_mutex);
2193         osdc->last_tid = 0;
2194         osdc->osds = RB_ROOT;
2195         INIT_LIST_HEAD(&osdc->osd_lru);
2196         osdc->requests = RB_ROOT;
2197         INIT_LIST_HEAD(&osdc->req_lru);
2198         INIT_LIST_HEAD(&osdc->req_unsent);
2199         INIT_LIST_HEAD(&osdc->req_notarget);
2200         INIT_LIST_HEAD(&osdc->req_linger);
2201         osdc->num_requests = 0;
2202         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2203         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2204         spin_lock_init(&osdc->event_lock);
2205         osdc->event_tree = RB_ROOT;
2206         osdc->event_count = 0;
2207
2208         schedule_delayed_work(&osdc->osds_timeout_work,
2209            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2210
2211         err = -ENOMEM;
2212         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2213                                         sizeof(struct ceph_osd_request));
2214         if (!osdc->req_mempool)
2215                 goto out;
2216
2217         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2218                                 OSD_OP_FRONT_LEN, 10, true,
2219                                 "osd_op");
2220         if (err < 0)
2221                 goto out_mempool;
2222         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2223                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2224                                 "osd_op_reply");
2225         if (err < 0)
2226                 goto out_msgpool;
2227
2228         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2229         if (IS_ERR(osdc->notify_wq)) {
2230                 err = PTR_ERR(osdc->notify_wq);
2231                 osdc->notify_wq = NULL;
2232                 goto out_msgpool;
2233         }
2234         return 0;
2235
2236 out_msgpool:
2237         ceph_msgpool_destroy(&osdc->msgpool_op);
2238 out_mempool:
2239         mempool_destroy(osdc->req_mempool);
2240 out:
2241         return err;
2242 }
2243
2244 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2245 {
2246         flush_workqueue(osdc->notify_wq);
2247         destroy_workqueue(osdc->notify_wq);
2248         cancel_delayed_work_sync(&osdc->timeout_work);
2249         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2250         if (osdc->osdmap) {
2251                 ceph_osdmap_destroy(osdc->osdmap);
2252                 osdc->osdmap = NULL;
2253         }
2254         remove_all_osds(osdc);
2255         mempool_destroy(osdc->req_mempool);
2256         ceph_msgpool_destroy(&osdc->msgpool_op);
2257         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2258 }
2259
2260 /*
2261  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2262  * *plen.  Return number of bytes read, or error.
2263  */
2264 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2265                         struct ceph_vino vino, struct ceph_file_layout *layout,
2266                         u64 off, u64 *plen,
2267                         u32 truncate_seq, u64 truncate_size,
2268                         struct page **pages, int num_pages, int page_align)
2269 {
2270         struct ceph_osd_request *req;
2271         int rc = 0;
2272
2273         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2274              vino.snap, off, *plen);
2275         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2276                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2277                                     NULL, truncate_seq, truncate_size,
2278                                     false);
2279         if (IS_ERR(req))
2280                 return PTR_ERR(req);
2281
2282         /* it may be a short read due to an object boundary */
2283
2284         osd_req_op_extent_osd_data_pages(req, 0,
2285                                 pages, *plen, page_align, false, false);
2286
2287         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2288              off, *plen, *plen, page_align);
2289
2290         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2291
2292         rc = ceph_osdc_start_request(osdc, req, false);
2293         if (!rc)
2294                 rc = ceph_osdc_wait_request(osdc, req);
2295
2296         ceph_osdc_put_request(req);
2297         dout("readpages result %d\n", rc);
2298         return rc;
2299 }
2300 EXPORT_SYMBOL(ceph_osdc_readpages);
2301
2302 /*
2303  * do a synchronous write on N pages
2304  */
2305 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2306                          struct ceph_file_layout *layout,
2307                          struct ceph_snap_context *snapc,
2308                          u64 off, u64 len,
2309                          u32 truncate_seq, u64 truncate_size,
2310                          struct timespec *mtime,
2311                          struct page **pages, int num_pages)
2312 {
2313         struct ceph_osd_request *req;
2314         int rc = 0;
2315         int page_align = off & ~PAGE_MASK;
2316
2317         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2318         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2319                                     CEPH_OSD_OP_WRITE,
2320                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2321                                     snapc, truncate_seq, truncate_size,
2322                                     true);
2323         if (IS_ERR(req))
2324                 return PTR_ERR(req);
2325
2326         /* it may be a short write due to an object boundary */
2327         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2328                                 false, false);
2329         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2330
2331         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2332
2333         rc = ceph_osdc_start_request(osdc, req, true);
2334         if (!rc)
2335                 rc = ceph_osdc_wait_request(osdc, req);
2336
2337         ceph_osdc_put_request(req);
2338         if (rc == 0)
2339                 rc = len;
2340         dout("writepages result %d\n", rc);
2341         return rc;
2342 }
2343 EXPORT_SYMBOL(ceph_osdc_writepages);
2344
2345 /*
2346  * handle incoming message
2347  */
2348 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2349 {
2350         struct ceph_osd *osd = con->private;
2351         struct ceph_osd_client *osdc;
2352         int type = le16_to_cpu(msg->hdr.type);
2353
2354         if (!osd)
2355                 goto out;
2356         osdc = osd->o_osdc;
2357
2358         switch (type) {
2359         case CEPH_MSG_OSD_MAP:
2360                 ceph_osdc_handle_map(osdc, msg);
2361                 break;
2362         case CEPH_MSG_OSD_OPREPLY:
2363                 handle_reply(osdc, msg, con);
2364                 break;
2365         case CEPH_MSG_WATCH_NOTIFY:
2366                 handle_watch_notify(osdc, msg);
2367                 break;
2368
2369         default:
2370                 pr_err("received unknown message type %d %s\n", type,
2371                        ceph_msg_type_name(type));
2372         }
2373 out:
2374         ceph_msg_put(msg);
2375 }
2376
2377 /*
2378  * lookup and return message for incoming reply.  set up reply message
2379  * pages.
2380  */
2381 static struct ceph_msg *get_reply(struct ceph_connection *con,
2382                                   struct ceph_msg_header *hdr,
2383                                   int *skip)
2384 {
2385         struct ceph_osd *osd = con->private;
2386         struct ceph_osd_client *osdc = osd->o_osdc;
2387         struct ceph_msg *m;
2388         struct ceph_osd_request *req;
2389         int front = le32_to_cpu(hdr->front_len);
2390         int data_len = le32_to_cpu(hdr->data_len);
2391         u64 tid;
2392
2393         tid = le64_to_cpu(hdr->tid);
2394         mutex_lock(&osdc->request_mutex);
2395         req = __lookup_request(osdc, tid);
2396         if (!req) {
2397                 *skip = 1;
2398                 m = NULL;
2399                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2400                      osd->o_osd);
2401                 goto out;
2402         }
2403
2404         if (req->r_reply->con)
2405                 dout("%s revoking msg %p from old con %p\n", __func__,
2406                      req->r_reply, req->r_reply->con);
2407         ceph_msg_revoke_incoming(req->r_reply);
2408
2409         if (front > req->r_reply->front.iov_len) {
2410                 pr_warning("get_reply front %d > preallocated %d\n",
2411                            front, (int)req->r_reply->front.iov_len);
2412                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2413                 if (!m)
2414                         goto out;
2415                 ceph_msg_put(req->r_reply);
2416                 req->r_reply = m;
2417         }
2418         m = ceph_msg_get(req->r_reply);
2419
2420         if (data_len > 0) {
2421                 struct ceph_osd_data *osd_data;
2422
2423                 /*
2424                  * XXX This is assuming there is only one op containing
2425                  * XXX page data.  Probably OK for reads, but this
2426                  * XXX ought to be done more generally.
2427                  */
2428                 osd_data = osd_req_op_extent_osd_data(req, 0);
2429                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2430                         if (osd_data->pages &&
2431                                 unlikely(osd_data->length < data_len)) {
2432
2433                                 pr_warning("tid %lld reply has %d bytes "
2434                                         "we had only %llu bytes ready\n",
2435                                         tid, data_len, osd_data->length);
2436                                 *skip = 1;
2437                                 ceph_msg_put(m);
2438                                 m = NULL;
2439                                 goto out;
2440                         }
2441                 }
2442         }
2443         *skip = 0;
2444         dout("get_reply tid %lld %p\n", tid, m);
2445
2446 out:
2447         mutex_unlock(&osdc->request_mutex);
2448         return m;
2449
2450 }
2451
2452 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2453                                   struct ceph_msg_header *hdr,
2454                                   int *skip)
2455 {
2456         struct ceph_osd *osd = con->private;
2457         int type = le16_to_cpu(hdr->type);
2458         int front = le32_to_cpu(hdr->front_len);
2459
2460         *skip = 0;
2461         switch (type) {
2462         case CEPH_MSG_OSD_MAP:
2463         case CEPH_MSG_WATCH_NOTIFY:
2464                 return ceph_msg_new(type, front, GFP_NOFS, false);
2465         case CEPH_MSG_OSD_OPREPLY:
2466                 return get_reply(con, hdr, skip);
2467         default:
2468                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2469                         osd->o_osd);
2470                 *skip = 1;
2471                 return NULL;
2472         }
2473 }
2474
2475 /*
2476  * Wrappers to refcount containing ceph_osd struct
2477  */
2478 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2479 {
2480         struct ceph_osd *osd = con->private;
2481         if (get_osd(osd))
2482                 return con;
2483         return NULL;
2484 }
2485
2486 static void put_osd_con(struct ceph_connection *con)
2487 {
2488         struct ceph_osd *osd = con->private;
2489         put_osd(osd);
2490 }
2491
2492 /*
2493  * authentication
2494  */
2495 /*
2496  * Note: returned pointer is the address of a structure that's
2497  * managed separately.  Caller must *not* attempt to free it.
2498  */
2499 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2500                                         int *proto, int force_new)
2501 {
2502         struct ceph_osd *o = con->private;
2503         struct ceph_osd_client *osdc = o->o_osdc;
2504         struct ceph_auth_client *ac = osdc->client->monc.auth;
2505         struct ceph_auth_handshake *auth = &o->o_auth;
2506
2507         if (force_new && auth->authorizer) {
2508                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2509                 auth->authorizer = NULL;
2510         }
2511         if (!auth->authorizer) {
2512                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2513                                                       auth);
2514                 if (ret)
2515                         return ERR_PTR(ret);
2516         } else {
2517                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2518                                                      auth);
2519                 if (ret)
2520                         return ERR_PTR(ret);
2521         }
2522         *proto = ac->protocol;
2523
2524         return auth;
2525 }
2526
2527
2528 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2529 {
2530         struct ceph_osd *o = con->private;
2531         struct ceph_osd_client *osdc = o->o_osdc;
2532         struct ceph_auth_client *ac = osdc->client->monc.auth;
2533
2534         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2535 }
2536
2537 static int invalidate_authorizer(struct ceph_connection *con)
2538 {
2539         struct ceph_osd *o = con->private;
2540         struct ceph_osd_client *osdc = o->o_osdc;
2541         struct ceph_auth_client *ac = osdc->client->monc.auth;
2542
2543         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2544         return ceph_monc_validate_auth(&osdc->client->monc);
2545 }
2546
2547 static const struct ceph_connection_operations osd_con_ops = {
2548         .get = get_osd_con,
2549         .put = put_osd_con,
2550         .dispatch = dispatch,
2551         .get_authorizer = get_authorizer,
2552         .verify_authorizer_reply = verify_authorizer_reply,
2553         .invalidate_authorizer = invalidate_authorizer,
2554         .alloc_msg = alloc_msg,
2555         .fault = osd_reset,
2556 };