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, bool write_request)
 121 {
 122         BUG_ON(which >= osd_req->r_num_ops);
 123
 124         /* return &osd_req->r_ops[which].extent.osd_data; */
 125         return write_request ? &osd_req->r_data_out : &osd_req->r_data_in;
 126 }
 127 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
 128
 129 struct ceph_osd_data *
 130 osd_req_op_cls_request_info(struct ceph_osd_request *osd_req,
 131                         unsigned int which)
 132 {
 133         BUG_ON(which >= osd_req->r_num_ops);
 134
 135         /* return &osd_req->r_ops[which].cls.request_info; */
 136         return &osd_req->r_data_out;    /* Request data is outgoing */
 137 }
 138 EXPORT_SYMBOL(osd_req_op_cls_request_info);     /* ??? */
 139
 140 struct ceph_osd_data *
 141 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
 142                         unsigned int which)
 143 {
 144         BUG_ON(which >= osd_req->r_num_ops);
 145
 146         /* return &osd_req->r_ops[which].cls.response_data; */
 147         return &osd_req->r_data_in;     /* Response data is incoming */
 148 }
 149 EXPORT_SYMBOL(osd_req_op_cls_response_data);    /* ??? */
 150
 151 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
 152                         unsigned int which, bool write_request,
 153                         struct page **pages, u64 length, u32 alignment,
 154                         bool pages_from_pool, bool own_pages)
 155 {
 156         struct ceph_osd_data *osd_data;
 157
 158         osd_data = osd_req_op_extent_osd_data(osd_req, which, write_request);
 159         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 160                                 pages_from_pool, own_pages);
 161
 162         osd_req->r_ops[which].extent.osd_data =
 163                 osd_req_op_extent_osd_data(osd_req, which, write_request);
 164 }
 165 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
 166
 167 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
 168                         unsigned int which, bool write_request,
 169                         struct ceph_pagelist *pagelist)
 170 {
 171         struct ceph_osd_data *osd_data;
 172
 173         osd_data = osd_req_op_extent_osd_data(osd_req, which, write_request);
 174         ceph_osd_data_pagelist_init(osd_data, pagelist);
 175
 176         osd_req->r_ops[which].extent.osd_data =
 177                 osd_req_op_extent_osd_data(osd_req, which, write_request);
 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, bool write_request,
 184                         struct bio *bio, size_t bio_length)
 185 {
 186         struct ceph_osd_data *osd_data;
 187
 188         osd_data = osd_req_op_extent_osd_data(osd_req, which, write_request);
 189         ceph_osd_data_bio_init(osd_data, bio, bio_length);
 190
 191         osd_req->r_ops[which].extent.osd_data =
 192                 osd_req_op_extent_osd_data(osd_req, which, write_request);
 193 }
 194 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
 195 #endif /* CONFIG_BLOCK */
 196
 197 static void osd_req_op_cls_request_info_pagelist(
 198                         struct ceph_osd_request *osd_req,
 199                         unsigned int which, struct ceph_pagelist *pagelist)
 200 {
 201         struct ceph_osd_data *osd_data;
 202
 203         osd_data = osd_req_op_cls_request_info(osd_req, which);
 204         ceph_osd_data_pagelist_init(osd_data, pagelist);
 205
 206         osd_req->r_ops[which].cls.request_info =
 207                 osd_req_op_cls_request_info(osd_req, which);
 208 }
 209
 210 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
 211                         unsigned int which, struct page **pages, u64 length,
 212                         u32 alignment, bool pages_from_pool, bool own_pages)
 213 {
 214         struct ceph_osd_data *osd_data;
 215
 216         osd_data = osd_req_op_cls_response_data(osd_req, which);
 217         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 218                                 pages_from_pool, own_pages);
 219
 220         osd_req->r_ops[which].cls.response_data =
 221                 osd_req_op_cls_response_data(osd_req, which);
 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 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
 245 {
 246         if (osd_data->type != CEPH_OSD_DATA_TYPE_PAGES)
 247                 return;
 248
 249         if (osd_data->own_pages) {
 250                 int num_pages;
 251
 252                 num_pages = calc_pages_for((u64)osd_data->alignment,
 253                                                 (u64)osd_data->length);
 254                 ceph_release_page_vector(osd_data->pages, num_pages);
 255         }
 256 }
 257
 258 /*
 259  * requests
 260  */
 261 void ceph_osdc_release_request(struct kref *kref)
 262 {
 263         struct ceph_osd_request *req;
 264
 265         req = container_of(kref, struct ceph_osd_request, r_kref);
 266         if (req->r_request)
 267                 ceph_msg_put(req->r_request);
 268         if (req->r_reply) {
 269                 ceph_msg_revoke_incoming(req->r_reply);
 270                 ceph_msg_put(req->r_reply);
 271         }
 272
 273         ceph_osd_data_release(&req->r_data_in);
 274         ceph_osd_data_release(&req->r_data_out);
 275
 276         ceph_put_snap_context(req->r_snapc);
 277         if (req->r_mempool)
 278                 mempool_free(req, req->r_osdc->req_mempool);
 279         else
 280                 kfree(req);
 281 }
 282 EXPORT_SYMBOL(ceph_osdc_release_request);
 283
 284 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 285                                                struct ceph_snap_context *snapc,
 286                                                unsigned int num_ops,
 287                                                bool use_mempool,
 288                                                gfp_t gfp_flags)
 289 {
 290         struct ceph_osd_request *req;
 291         struct ceph_msg *msg;
 292         size_t msg_size;
 293
 294         BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
 295         BUG_ON(num_ops > CEPH_OSD_MAX_OP);
 296
 297         msg_size = 4 + 4 + 8 + 8 + 4+8;
 298         msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
 299         msg_size += 1 + 8 + 4 + 4;     /* pg_t */
 300         msg_size += 4 + MAX_OBJ_NAME_SIZE;
 301         msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
 302         msg_size += 8;  /* snapid */
 303         msg_size += 8;  /* snap_seq */
 304         msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
 305         msg_size += 4;
 306
 307         if (use_mempool) {
 308                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 309                 memset(req, 0, sizeof(*req));
 310         } else {
 311                 req = kzalloc(sizeof(*req), gfp_flags);
 312         }
 313         if (req == NULL)
 314                 return NULL;
 315
 316         req->r_osdc = osdc;
 317         req->r_mempool = use_mempool;
 318         req->r_num_ops = num_ops;
 319
 320         kref_init(&req->r_kref);
 321         init_completion(&req->r_completion);
 322         init_completion(&req->r_safe_completion);
 323         RB_CLEAR_NODE(&req->r_node);
 324         INIT_LIST_HEAD(&req->r_unsafe_item);
 325         INIT_LIST_HEAD(&req->r_linger_item);
 326         INIT_LIST_HEAD(&req->r_linger_osd);
 327         INIT_LIST_HEAD(&req->r_req_lru_item);
 328         INIT_LIST_HEAD(&req->r_osd_item);
 329
 330         /* create reply message */
 331         if (use_mempool)
 332                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 333         else
 334                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 335                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 336         if (!msg) {
 337                 ceph_osdc_put_request(req);
 338                 return NULL;
 339         }
 340         req->r_reply = msg;
 341
 342         ceph_osd_data_init(&req->r_data_in);
 343         ceph_osd_data_init(&req->r_data_out);
 344
 345         /* create request message; allow space for oid */
 346         if (use_mempool)
 347                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 348         else
 349                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 350         if (!msg) {
 351                 ceph_osdc_put_request(req);
 352                 return NULL;
 353         }
 354
 355         memset(msg->front.iov_base, 0, msg->front.iov_len);
 356
 357         req->r_request = msg;
 358
 359         return req;
 360 }
 361 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 362
 363 static bool osd_req_opcode_valid(u16 opcode)
 364 {
 365         switch (opcode) {
 366         case CEPH_OSD_OP_READ:
 367         case CEPH_OSD_OP_STAT:
 368         case CEPH_OSD_OP_MAPEXT:
 369         case CEPH_OSD_OP_MASKTRUNC:
 370         case CEPH_OSD_OP_SPARSE_READ:
 371         case CEPH_OSD_OP_NOTIFY:
 372         case CEPH_OSD_OP_NOTIFY_ACK:
 373         case CEPH_OSD_OP_ASSERT_VER:
 374         case CEPH_OSD_OP_WRITE:
 375         case CEPH_OSD_OP_WRITEFULL:
 376         case CEPH_OSD_OP_TRUNCATE:
 377         case CEPH_OSD_OP_ZERO:
 378         case CEPH_OSD_OP_DELETE:
 379         case CEPH_OSD_OP_APPEND:
 380         case CEPH_OSD_OP_STARTSYNC:
 381         case CEPH_OSD_OP_SETTRUNC:
 382         case CEPH_OSD_OP_TRIMTRUNC:
 383         case CEPH_OSD_OP_TMAPUP:
 384         case CEPH_OSD_OP_TMAPPUT:
 385         case CEPH_OSD_OP_TMAPGET:
 386         case CEPH_OSD_OP_CREATE:
 387         case CEPH_OSD_OP_ROLLBACK:
 388         case CEPH_OSD_OP_WATCH:
 389         case CEPH_OSD_OP_OMAPGETKEYS:
 390         case CEPH_OSD_OP_OMAPGETVALS:
 391         case CEPH_OSD_OP_OMAPGETHEADER:
 392         case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
 393         case CEPH_OSD_OP_OMAPSETVALS:
 394         case CEPH_OSD_OP_OMAPSETHEADER:
 395         case CEPH_OSD_OP_OMAPCLEAR:
 396         case CEPH_OSD_OP_OMAPRMKEYS:
 397         case CEPH_OSD_OP_OMAP_CMP:
 398         case CEPH_OSD_OP_CLONERANGE:
 399         case CEPH_OSD_OP_ASSERT_SRC_VERSION:
 400         case CEPH_OSD_OP_SRC_CMPXATTR:
 401         case CEPH_OSD_OP_GETXATTR:
 402         case CEPH_OSD_OP_GETXATTRS:
 403         case CEPH_OSD_OP_CMPXATTR:
 404         case CEPH_OSD_OP_SETXATTR:
 405         case CEPH_OSD_OP_SETXATTRS:
 406         case CEPH_OSD_OP_RESETXATTRS:
 407         case CEPH_OSD_OP_RMXATTR:
 408         case CEPH_OSD_OP_PULL:
 409         case CEPH_OSD_OP_PUSH:
 410         case CEPH_OSD_OP_BALANCEREADS:
 411         case CEPH_OSD_OP_UNBALANCEREADS:
 412         case CEPH_OSD_OP_SCRUB:
 413         case CEPH_OSD_OP_SCRUB_RESERVE:
 414         case CEPH_OSD_OP_SCRUB_UNRESERVE:
 415         case CEPH_OSD_OP_SCRUB_STOP:
 416         case CEPH_OSD_OP_SCRUB_MAP:
 417         case CEPH_OSD_OP_WRLOCK:
 418         case CEPH_OSD_OP_WRUNLOCK:
 419         case CEPH_OSD_OP_RDLOCK:
 420         case CEPH_OSD_OP_RDUNLOCK:
 421         case CEPH_OSD_OP_UPLOCK:
 422         case CEPH_OSD_OP_DNLOCK:
 423         case CEPH_OSD_OP_CALL:
 424         case CEPH_OSD_OP_PGLS:
 425         case CEPH_OSD_OP_PGLS_FILTER:
 426                 return true;
 427         default:
 428                 return false;
 429         }
 430 }
 431
 432 /*
 433  * This is an osd op init function for opcodes that have no data or
 434  * other information associated with them.  It also serves as a
 435  * common init routine for all the other init functions, below.
 436  */
 437 static struct ceph_osd_req_op *
 438 osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
 439                                 u16 opcode)
 440 {
 441         struct ceph_osd_req_op *op;
 442
 443         BUG_ON(which >= osd_req->r_num_ops);
 444         BUG_ON(!osd_req_opcode_valid(opcode));
 445
 446         op = &osd_req->r_ops[which];
 447         memset(op, 0, sizeof (*op));
 448         op->op = opcode;
 449
 450         return op;
 451 }
 452
 453 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 454                                 unsigned int which, u16 opcode,
 455                                 u64 offset, u64 length,
 456                                 u64 truncate_size, u32 truncate_seq)
 457 {
 458         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which, opcode);
 459         size_t payload_len = 0;
 460
 461         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
 462
 463         op->extent.offset = offset;
 464         op->extent.length = length;
 465         op->extent.truncate_size = truncate_size;
 466         op->extent.truncate_seq = truncate_seq;
 467         if (opcode == CEPH_OSD_OP_WRITE)
 468                 payload_len += length;
 469
 470         op->payload_len = payload_len;
 471 }
 472 EXPORT_SYMBOL(osd_req_op_extent_init);
 473
 474 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 475                                 unsigned int which, u64 length)
 476 {
 477         struct ceph_osd_req_op *op;
 478         u64 previous;
 479
 480         BUG_ON(which >= osd_req->r_num_ops);
 481         op = &osd_req->r_ops[which];
 482         previous = op->extent.length;
 483
 484         if (length == previous)
 485                 return;         /* Nothing to do */
 486         BUG_ON(length > previous);
 487
 488         op->extent.length = length;
 489         op->payload_len -= previous - length;
 490 }
 491 EXPORT_SYMBOL(osd_req_op_extent_update);
 492
 493 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
 494                         u16 opcode, const char *class, const char *method,
 495                         const void *request_data, size_t request_data_size)
 496 {
 497         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which, opcode);
 498         struct ceph_pagelist *pagelist;
 499         size_t payload_len = 0;
 500         size_t size;
 501
 502         BUG_ON(opcode != CEPH_OSD_OP_CALL);
 503
 504         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
 505         BUG_ON(!pagelist);
 506         ceph_pagelist_init(pagelist);
 507
 508         op->cls.class_name = class;
 509         size = strlen(class);
 510         BUG_ON(size > (size_t) U8_MAX);
 511         op->cls.class_len = size;
 512         ceph_pagelist_append(pagelist, class, size);
 513         payload_len += size;
 514
 515         op->cls.method_name = method;
 516         size = strlen(method);
 517         BUG_ON(size > (size_t) U8_MAX);
 518         op->cls.method_len = size;
 519         ceph_pagelist_append(pagelist, method, size);
 520         payload_len += size;
 521
 522         op->cls.request_data = request_data;
 523         BUG_ON(request_data_size > (size_t) U32_MAX);
 524         op->cls.request_data_len = (u32) request_data_size;
 525         ceph_pagelist_append(pagelist, request_data, request_data_size);
 526         payload_len += request_data_size;
 527
 528         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
 529
 530         op->cls.argc = 0;       /* currently unused */
 531
 532         op->payload_len = payload_len;
 533 }
 534 EXPORT_SYMBOL(osd_req_op_cls_init);
 535
 536 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 537                                 unsigned int which, u16 opcode,
 538                                 u64 cookie, u64 version, int flag)
 539 {
 540         struct ceph_osd_req_op *op = osd_req_op_init(osd_req, which, opcode);
 541
 542         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
 543
 544         op->watch.cookie = cookie;
 545         /* op->watch.ver = version; */  /* XXX 3847 */
 546         op->watch.ver = cpu_to_le64(version);
 547         if (opcode == CEPH_OSD_OP_WATCH && flag)
 548                 op->watch.flag = (u8)1;
 549 }
 550 EXPORT_SYMBOL(osd_req_op_watch_init);
 551
 552 static u64 osd_req_encode_op(struct ceph_osd_request *req,
 553                               struct ceph_osd_op *dst, unsigned int which)
 554 {
 555         struct ceph_osd_req_op *src;
 556         u64 request_data_len = 0;
 557
 558         BUG_ON(which >= req->r_num_ops);
 559         src = &req->r_ops[which];
 560         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
 561                 pr_err("unrecognized osd opcode %d\n", src->op);
 562
 563                 return 0;
 564         }
 565
 566         switch (src->op) {
 567         case CEPH_OSD_OP_STAT:
 568                 break;
 569         case CEPH_OSD_OP_READ:
 570         case CEPH_OSD_OP_WRITE:
 571                 if (src->op == CEPH_OSD_OP_WRITE)
 572                         request_data_len = src->extent.length;
 573                 dst->extent.offset = cpu_to_le64(src->extent.offset);
 574                 dst->extent.length = cpu_to_le64(src->extent.length);
 575                 dst->extent.truncate_size =
 576                         cpu_to_le64(src->extent.truncate_size);
 577                 dst->extent.truncate_seq =
 578                         cpu_to_le32(src->extent.truncate_seq);
 579                 if (src->op == CEPH_OSD_OP_WRITE)
 580                         WARN_ON(src->extent.osd_data != &req->r_data_out);
 581                 else
 582                         WARN_ON(src->extent.osd_data != &req->r_data_in);
 583                 break;
 584         case CEPH_OSD_OP_CALL:
 585                 dst->cls.class_len = src->cls.class_len;
 586                 dst->cls.method_len = src->cls.method_len;
 587                 dst->cls.indata_len = cpu_to_le32(src->cls.request_data_len);
 588                 WARN_ON(src->cls.response_data != &req->r_data_in);
 589                 WARN_ON(src->cls.request_info != &req->r_data_out);
 590                 BUG_ON(src->cls.request_info->type !=
 591                                         CEPH_OSD_DATA_TYPE_PAGELIST);
 592                 request_data_len = src->cls.request_info->pagelist->length;
 593                 break;
 594         case CEPH_OSD_OP_STARTSYNC:
 595                 break;
 596         case CEPH_OSD_OP_NOTIFY_ACK:
 597         case CEPH_OSD_OP_WATCH:
 598                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 599                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 600                 dst->watch.flag = src->watch.flag;
 601                 break;
 602         default:
 603                 pr_err("unsupported osd opcode %s\n",
 604                         ceph_osd_op_name(src->op));
 605                 WARN_ON(1);
 606
 607                 return 0;
 608         }
 609         dst->op = cpu_to_le16(src->op);
 610         dst->payload_len = cpu_to_le32(src->payload_len);
 611
 612         return request_data_len;
 613 }
 614
 615 /*
 616  * build new request AND message, calculate layout, and adjust file
 617  * extent as needed.
 618  *
 619  * if the file was recently truncated, we include information about its
 620  * old and new size so that the object can be updated appropriately.  (we
 621  * avoid synchronously deleting truncated objects because it's slow.)
 622  *
 623  * if @do_sync, include a 'startsync' command so that the osd will flush
 624  * data quickly.
 625  */
 626 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 627                                                struct ceph_file_layout *layout,
 628                                                struct ceph_vino vino,
 629                                                u64 off, u64 *plen, int num_ops,
 630                                                int opcode, int flags,
 631                                                struct ceph_snap_context *snapc,
 632                                                u32 truncate_seq,
 633                                                u64 truncate_size,
 634                                                bool use_mempool)
 635 {
 636         struct ceph_osd_request *req;
 637         u64 objnum = 0;
 638         u64 objoff = 0;
 639         u64 objlen = 0;
 640         u32 object_size;
 641         u64 object_base;
 642         int r;
 643
 644         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
 645
 646         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
 647                                         GFP_NOFS);
 648         if (!req)
 649                 return ERR_PTR(-ENOMEM);
 650
 651         req->r_flags = flags;
 652
 653         /* calculate max write size */
 654         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
 655         if (r < 0) {
 656                 ceph_osdc_put_request(req);
 657                 return ERR_PTR(r);
 658         }
 659
 660         object_size = le32_to_cpu(layout->fl_object_size);
 661         object_base = off - objoff;
 662         if (truncate_size <= object_base) {
 663                 truncate_size = 0;
 664         } else {
 665                 truncate_size -= object_base;
 666                 if (truncate_size > object_size)
 667                         truncate_size = object_size;
 668         }
 669
 670         osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
 671                                 truncate_size, truncate_seq);
 672
 673         /*
 674          * A second op in the ops array means the caller wants to
 675          * also issue a include a 'startsync' command so that the
 676          * osd will flush data quickly.
 677          */
 678         if (num_ops > 1)
 679                 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
 680
 681         req->r_file_layout = *layout;  /* keep a copy */
 682
 683         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx",
 684                 vino.ino, objnum);
 685         req->r_oid_len = strlen(req->r_oid);
 686
 687         return req;
 688 }
 689 EXPORT_SYMBOL(ceph_osdc_new_request);
 690
 691 /*
 692  * We keep osd requests in an rbtree, sorted by ->r_tid.
 693  */
 694 static void __insert_request(struct ceph_osd_client *osdc,
 695                              struct ceph_osd_request *new)
 696 {
 697         struct rb_node **p = &osdc->requests.rb_node;
 698         struct rb_node *parent = NULL;
 699         struct ceph_osd_request *req = NULL;
 700
 701         while (*p) {
 702                 parent = *p;
 703                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 704                 if (new->r_tid < req->r_tid)
 705                         p = &(*p)->rb_left;
 706                 else if (new->r_tid > req->r_tid)
 707                         p = &(*p)->rb_right;
 708                 else
 709                         BUG();
 710         }
 711
 712         rb_link_node(&new->r_node, parent, p);
 713         rb_insert_color(&new->r_node, &osdc->requests);
 714 }
 715
 716 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 717                                                  u64 tid)
 718 {
 719         struct ceph_osd_request *req;
 720         struct rb_node *n = osdc->requests.rb_node;
 721
 722         while (n) {
 723                 req = rb_entry(n, struct ceph_osd_request, r_node);
 724                 if (tid < req->r_tid)
 725                         n = n->rb_left;
 726                 else if (tid > req->r_tid)
 727                         n = n->rb_right;
 728                 else
 729                         return req;
 730         }
 731         return NULL;
 732 }
 733
 734 static struct ceph_osd_request *
 735 __lookup_request_ge(struct ceph_osd_client *osdc,
 736                     u64 tid)
 737 {
 738         struct ceph_osd_request *req;
 739         struct rb_node *n = osdc->requests.rb_node;
 740
 741         while (n) {
 742                 req = rb_entry(n, struct ceph_osd_request, r_node);
 743                 if (tid < req->r_tid) {
 744                         if (!n->rb_left)
 745                                 return req;
 746                         n = n->rb_left;
 747                 } else if (tid > req->r_tid) {
 748                         n = n->rb_right;
 749                 } else {
 750                         return req;
 751                 }
 752         }
 753         return NULL;
 754 }
 755
 756 /*
 757  * Resubmit requests pending on the given osd.
 758  */
 759 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 760                                 struct ceph_osd *osd)
 761 {
 762         struct ceph_osd_request *req, *nreq;
 763         LIST_HEAD(resend);
 764         int err;
 765
 766         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 767         err = __reset_osd(osdc, osd);
 768         if (err)
 769                 return;
 770         /*
 771          * Build up a list of requests to resend by traversing the
 772          * osd's list of requests.  Requests for a given object are
 773          * sent in tid order, and that is also the order they're
 774          * kept on this list.  Therefore all requests that are in
 775          * flight will be found first, followed by all requests that
 776          * have not yet been sent.  And to resend requests while
 777          * preserving this order we will want to put any sent
 778          * requests back on the front of the osd client's unsent
 779          * list.
 780          *
 781          * So we build a separate ordered list of already-sent
 782          * requests for the affected osd and splice it onto the
 783          * front of the osd client's unsent list.  Once we've seen a
 784          * request that has not yet been sent we're done.  Those
 785          * requests are already sitting right where they belong.
 786          */
 787         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 788                 if (!req->r_sent)
 789                         break;
 790                 list_move_tail(&req->r_req_lru_item, &resend);
 791                 dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
 792                      osd->o_osd);
 793                 if (!req->r_linger)
 794                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 795         }
 796         list_splice(&resend, &osdc->req_unsent);
 797
 798         /*
 799          * Linger requests are re-registered before sending, which
 800          * sets up a new tid for each.  We add them to the unsent
 801          * list at the end to keep things in tid order.
 802          */
 803         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 804                                  r_linger_osd) {
 805                 /*
 806                  * reregister request prior to unregistering linger so
 807                  * that r_osd is preserved.
 808                  */
 809                 BUG_ON(!list_empty(&req->r_req_lru_item));
 810                 __register_request(osdc, req);
 811                 list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
 812                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
 813                 __unregister_linger_request(osdc, req);
 814                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 815                      osd->o_osd);
 816         }
 817 }
 818
 819 /*
 820  * If the osd connection drops, we need to resubmit all requests.
 821  */
 822 static void osd_reset(struct ceph_connection *con)
 823 {
 824         struct ceph_osd *osd = con->private;
 825         struct ceph_osd_client *osdc;
 826
 827         if (!osd)
 828                 return;
 829         dout("osd_reset osd%d\n", osd->o_osd);
 830         osdc = osd->o_osdc;
 831         down_read(&osdc->map_sem);
 832         mutex_lock(&osdc->request_mutex);
 833         __kick_osd_requests(osdc, osd);
 834         __send_queued(osdc);
 835         mutex_unlock(&osdc->request_mutex);
 836         up_read(&osdc->map_sem);
 837 }
 838
 839 /*
 840  * Track open sessions with osds.
 841  */
 842 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 843 {
 844         struct ceph_osd *osd;
 845
 846         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 847         if (!osd)
 848                 return NULL;
 849
 850         atomic_set(&osd->o_ref, 1);
 851         osd->o_osdc = osdc;
 852         osd->o_osd = onum;
 853         RB_CLEAR_NODE(&osd->o_node);
 854         INIT_LIST_HEAD(&osd->o_requests);
 855         INIT_LIST_HEAD(&osd->o_linger_requests);
 856         INIT_LIST_HEAD(&osd->o_osd_lru);
 857         osd->o_incarnation = 1;
 858
 859         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
 860
 861         INIT_LIST_HEAD(&osd->o_keepalive_item);
 862         return osd;
 863 }
 864
 865 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 866 {
 867         if (atomic_inc_not_zero(&osd->o_ref)) {
 868                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 869                      atomic_read(&osd->o_ref));
 870                 return osd;
 871         } else {
 872                 dout("get_osd %p FAIL\n", osd);
 873                 return NULL;
 874         }
 875 }
 876
 877 static void put_osd(struct ceph_osd *osd)
 878 {
 879         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 880              atomic_read(&osd->o_ref) - 1);
 881         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
 882                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 883
 884                 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
 885                 kfree(osd);
 886         }
 887 }
 888
 889 /*
 890  * remove an osd from our map
 891  */
 892 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 893 {
 894         dout("__remove_osd %p\n", osd);
 895         BUG_ON(!list_empty(&osd->o_requests));
 896         rb_erase(&osd->o_node, &osdc->osds);
 897         list_del_init(&osd->o_osd_lru);
 898         ceph_con_close(&osd->o_con);
 899         put_osd(osd);
 900 }
 901
 902 static void remove_all_osds(struct ceph_osd_client *osdc)
 903 {
 904         dout("%s %p\n", __func__, osdc);
 905         mutex_lock(&osdc->request_mutex);
 906         while (!RB_EMPTY_ROOT(&osdc->osds)) {
 907                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
 908                                                 struct ceph_osd, o_node);
 909                 __remove_osd(osdc, osd);
 910         }
 911         mutex_unlock(&osdc->request_mutex);
 912 }
 913
 914 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 915                               struct ceph_osd *osd)
 916 {
 917         dout("__move_osd_to_lru %p\n", osd);
 918         BUG_ON(!list_empty(&osd->o_osd_lru));
 919         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 920         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
 921 }
 922
 923 static void __remove_osd_from_lru(struct ceph_osd *osd)
 924 {
 925         dout("__remove_osd_from_lru %p\n", osd);
 926         if (!list_empty(&osd->o_osd_lru))
 927                 list_del_init(&osd->o_osd_lru);
 928 }
 929
 930 static void remove_old_osds(struct ceph_osd_client *osdc)
 931 {
 932         struct ceph_osd *osd, *nosd;
 933
 934         dout("__remove_old_osds %p\n", osdc);
 935         mutex_lock(&osdc->request_mutex);
 936         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 937                 if (time_before(jiffies, osd->lru_ttl))
 938                         break;
 939                 __remove_osd(osdc, osd);
 940         }
 941         mutex_unlock(&osdc->request_mutex);
 942 }
 943
 944 /*
 945  * reset osd connect
 946  */
 947 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 948 {
 949         struct ceph_entity_addr *peer_addr;
 950
 951         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 952         if (list_empty(&osd->o_requests) &&
 953             list_empty(&osd->o_linger_requests)) {
 954                 __remove_osd(osdc, osd);
 955
 956                 return -ENODEV;
 957         }
 958
 959         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
 960         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
 961                         !ceph_con_opened(&osd->o_con)) {
 962                 struct ceph_osd_request *req;
 963
 964                 dout(" osd addr hasn't changed and connection never opened,"
 965                      " letting msgr retry");
 966                 /* touch each r_stamp for handle_timeout()'s benfit */
 967                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
 968                         req->r_stamp = jiffies;
 969
 970                 return -EAGAIN;
 971         }
 972
 973         ceph_con_close(&osd->o_con);
 974         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
 975         osd->o_incarnation++;
 976
 977         return 0;
 978 }
 979
 980 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 981 {
 982         struct rb_node **p = &osdc->osds.rb_node;
 983         struct rb_node *parent = NULL;
 984         struct ceph_osd *osd = NULL;
 985
 986         dout("__insert_osd %p osd%d\n", new, new->o_osd);
 987         while (*p) {
 988                 parent = *p;
 989                 osd = rb_entry(parent, struct ceph_osd, o_node);
 990                 if (new->o_osd < osd->o_osd)
 991                         p = &(*p)->rb_left;
 992                 else if (new->o_osd > osd->o_osd)
 993                         p = &(*p)->rb_right;
 994                 else
 995                         BUG();
 996         }
 997
 998         rb_link_node(&new->o_node, parent, p);
 999         rb_insert_color(&new->o_node, &osdc->osds);
1000 }
1001
1002 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1003 {
1004         struct ceph_osd *osd;
1005         struct rb_node *n = osdc->osds.rb_node;
1006
1007         while (n) {
1008                 osd = rb_entry(n, struct ceph_osd, o_node);
1009                 if (o < osd->o_osd)
1010                         n = n->rb_left;
1011                 else if (o > osd->o_osd)
1012                         n = n->rb_right;
1013                 else
1014                         return osd;
1015         }
1016         return NULL;
1017 }
1018
1019 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1020 {
1021         schedule_delayed_work(&osdc->timeout_work,
1022                         osdc->client->options->osd_keepalive_timeout * HZ);
1023 }
1024
1025 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1026 {
1027         cancel_delayed_work(&osdc->timeout_work);
1028 }
1029
1030 /*
1031  * Register request, assign tid.  If this is the first request, set up
1032  * the timeout event.
1033  */
1034 static void __register_request(struct ceph_osd_client *osdc,
1035                                struct ceph_osd_request *req)
1036 {
1037         req->r_tid = ++osdc->last_tid;
1038         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1039         dout("__register_request %p tid %lld\n", req, req->r_tid);
1040         __insert_request(osdc, req);
1041         ceph_osdc_get_request(req);
1042         osdc->num_requests++;
1043         if (osdc->num_requests == 1) {
1044                 dout(" first request, scheduling timeout\n");
1045                 __schedule_osd_timeout(osdc);
1046         }
1047 }
1048
1049 /*
1050  * called under osdc->request_mutex
1051  */
1052 static void __unregister_request(struct ceph_osd_client *osdc,
1053                                  struct ceph_osd_request *req)
1054 {
1055         if (RB_EMPTY_NODE(&req->r_node)) {
1056                 dout("__unregister_request %p tid %lld not registered\n",
1057                         req, req->r_tid);
1058                 return;
1059         }
1060
1061         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1062         rb_erase(&req->r_node, &osdc->requests);
1063         osdc->num_requests--;
1064
1065         if (req->r_osd) {
1066                 /* make sure the original request isn't in flight. */
1067                 ceph_msg_revoke(req->r_request);
1068
1069                 list_del_init(&req->r_osd_item);
1070                 if (list_empty(&req->r_osd->o_requests) &&
1071                     list_empty(&req->r_osd->o_linger_requests)) {
1072                         dout("moving osd to %p lru\n", req->r_osd);
1073                         __move_osd_to_lru(osdc, req->r_osd);
1074                 }
1075                 if (list_empty(&req->r_linger_item))
1076                         req->r_osd = NULL;
1077         }
1078
1079         list_del_init(&req->r_req_lru_item);
1080         ceph_osdc_put_request(req);
1081
1082         if (osdc->num_requests == 0) {
1083                 dout(" no requests, canceling timeout\n");
1084                 __cancel_osd_timeout(osdc);
1085         }
1086 }
1087
1088 /*
1089  * Cancel a previously queued request message
1090  */
1091 static void __cancel_request(struct ceph_osd_request *req)
1092 {
1093         if (req->r_sent && req->r_osd) {
1094                 ceph_msg_revoke(req->r_request);
1095                 req->r_sent = 0;
1096         }
1097 }
1098
1099 static void __register_linger_request(struct ceph_osd_client *osdc,
1100                                     struct ceph_osd_request *req)
1101 {
1102         dout("__register_linger_request %p\n", req);
1103         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1104         if (req->r_osd)
1105                 list_add_tail(&req->r_linger_osd,
1106                               &req->r_osd->o_linger_requests);
1107 }
1108
1109 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1110                                         struct ceph_osd_request *req)
1111 {
1112         dout("__unregister_linger_request %p\n", req);
1113         list_del_init(&req->r_linger_item);
1114         if (req->r_osd) {
1115                 list_del_init(&req->r_linger_osd);
1116
1117                 if (list_empty(&req->r_osd->o_requests) &&
1118                     list_empty(&req->r_osd->o_linger_requests)) {
1119                         dout("moving osd to %p lru\n", req->r_osd);
1120                         __move_osd_to_lru(osdc, req->r_osd);
1121                 }
1122                 if (list_empty(&req->r_osd_item))
1123                         req->r_osd = NULL;
1124         }
1125 }
1126
1127 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
1128                                          struct ceph_osd_request *req)
1129 {
1130         mutex_lock(&osdc->request_mutex);
1131         if (req->r_linger) {
1132                 __unregister_linger_request(osdc, req);
1133                 ceph_osdc_put_request(req);
1134         }
1135         mutex_unlock(&osdc->request_mutex);
1136 }
1137 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
1138
1139 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1140                                   struct ceph_osd_request *req)
1141 {
1142         if (!req->r_linger) {
1143                 dout("set_request_linger %p\n", req);
1144                 req->r_linger = 1;
1145                 /*
1146                  * caller is now responsible for calling
1147                  * unregister_linger_request
1148                  */
1149                 ceph_osdc_get_request(req);
1150         }
1151 }
1152 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1153
1154 /*
1155  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1156  * (as needed), and set the request r_osd appropriately.  If there is
1157  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1158  * (unsent, homeless) or leave on in-flight lru.
1159  *
1160  * Return 0 if unchanged, 1 if changed, or negative on error.
1161  *
1162  * Caller should hold map_sem for read and request_mutex.
1163  */
1164 static int __map_request(struct ceph_osd_client *osdc,
1165                          struct ceph_osd_request *req, int force_resend)
1166 {
1167         struct ceph_pg pgid;
1168         int acting[CEPH_PG_MAX_SIZE];
1169         int o = -1, num = 0;
1170         int err;
1171
1172         dout("map_request %p tid %lld\n", req, req->r_tid);
1173         err = ceph_calc_ceph_pg(&pgid, req->r_oid, osdc->osdmap,
1174                                 ceph_file_layout_pg_pool(req->r_file_layout));
1175         if (err) {
1176                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1177                 return err;
1178         }
1179         req->r_pgid = pgid;
1180
1181         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
1182         if (err > 0) {
1183                 o = acting[0];
1184                 num = err;
1185         }
1186
1187         if ((!force_resend &&
1188              req->r_osd && req->r_osd->o_osd == o &&
1189              req->r_sent >= req->r_osd->o_incarnation &&
1190              req->r_num_pg_osds == num &&
1191              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1192             (req->r_osd == NULL && o == -1))
1193                 return 0;  /* no change */
1194
1195         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1196              req->r_tid, pgid.pool, pgid.seed, o,
1197              req->r_osd ? req->r_osd->o_osd : -1);
1198
1199         /* record full pg acting set */
1200         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1201         req->r_num_pg_osds = num;
1202
1203         if (req->r_osd) {
1204                 __cancel_request(req);
1205                 list_del_init(&req->r_osd_item);
1206                 req->r_osd = NULL;
1207         }
1208
1209         req->r_osd = __lookup_osd(osdc, o);
1210         if (!req->r_osd && o >= 0) {
1211                 err = -ENOMEM;
1212                 req->r_osd = create_osd(osdc, o);
1213                 if (!req->r_osd) {
1214                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1215                         goto out;
1216                 }
1217
1218                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1219                 __insert_osd(osdc, req->r_osd);
1220
1221                 ceph_con_open(&req->r_osd->o_con,
1222                               CEPH_ENTITY_TYPE_OSD, o,
1223                               &osdc->osdmap->osd_addr[o]);
1224         }
1225
1226         if (req->r_osd) {
1227                 __remove_osd_from_lru(req->r_osd);
1228                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1229                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1230         } else {
1231                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1232         }
1233         err = 1;   /* osd or pg changed */
1234
1235 out:
1236         return err;
1237 }
1238
1239 /*
1240  * caller should hold map_sem (for read) and request_mutex
1241  */
1242 static void __send_request(struct ceph_osd_client *osdc,
1243                            struct ceph_osd_request *req)
1244 {
1245         void *p;
1246
1247         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1248              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1249              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1250
1251         /* fill in message content that changes each time we send it */
1252         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1253         put_unaligned_le32(req->r_flags, req->r_request_flags);
1254         put_unaligned_le64(req->r_pgid.pool, req->r_request_pool);
1255         p = req->r_request_pgid;
1256         ceph_encode_64(&p, req->r_pgid.pool);
1257         ceph_encode_32(&p, req->r_pgid.seed);
1258         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1259         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1260                sizeof(req->r_reassert_version));
1261
1262         req->r_stamp = jiffies;
1263         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1264
1265         ceph_msg_get(req->r_request); /* send consumes a ref */
1266         ceph_con_send(&req->r_osd->o_con, req->r_request);
1267         req->r_sent = req->r_osd->o_incarnation;
1268 }
1269
1270 /*
1271  * Send any requests in the queue (req_unsent).
1272  */
1273 static void __send_queued(struct ceph_osd_client *osdc)
1274 {
1275         struct ceph_osd_request *req, *tmp;
1276
1277         dout("__send_queued\n");
1278         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1279                 __send_request(osdc, req);
1280 }
1281
1282 /*
1283  * Timeout callback, called every N seconds when 1 or more osd
1284  * requests has been active for more than N seconds.  When this
1285  * happens, we ping all OSDs with requests who have timed out to
1286  * ensure any communications channel reset is detected.  Reset the
1287  * request timeouts another N seconds in the future as we go.
1288  * Reschedule the timeout event another N seconds in future (unless
1289  * there are no open requests).
1290  */
1291 static void handle_timeout(struct work_struct *work)
1292 {
1293         struct ceph_osd_client *osdc =
1294                 container_of(work, struct ceph_osd_client, timeout_work.work);
1295         struct ceph_osd_request *req;
1296         struct ceph_osd *osd;
1297         unsigned long keepalive =
1298                 osdc->client->options->osd_keepalive_timeout * HZ;
1299         struct list_head slow_osds;
1300         dout("timeout\n");
1301         down_read(&osdc->map_sem);
1302
1303         ceph_monc_request_next_osdmap(&osdc->client->monc);
1304
1305         mutex_lock(&osdc->request_mutex);
1306
1307         /*
1308          * ping osds that are a bit slow.  this ensures that if there
1309          * is a break in the TCP connection we will notice, and reopen
1310          * a connection with that osd (from the fault callback).
1311          */
1312         INIT_LIST_HEAD(&slow_osds);
1313         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1314                 if (time_before(jiffies, req->r_stamp + keepalive))
1315                         break;
1316
1317                 osd = req->r_osd;
1318                 BUG_ON(!osd);
1319                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1320                      req->r_tid, osd->o_osd);
1321                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1322         }
1323         while (!list_empty(&slow_osds)) {
1324                 osd = list_entry(slow_osds.next, struct ceph_osd,
1325                                  o_keepalive_item);
1326                 list_del_init(&osd->o_keepalive_item);
1327                 ceph_con_keepalive(&osd->o_con);
1328         }
1329
1330         __schedule_osd_timeout(osdc);
1331         __send_queued(osdc);
1332         mutex_unlock(&osdc->request_mutex);
1333         up_read(&osdc->map_sem);
1334 }
1335
1336 static void handle_osds_timeout(struct work_struct *work)
1337 {
1338         struct ceph_osd_client *osdc =
1339                 container_of(work, struct ceph_osd_client,
1340                              osds_timeout_work.work);
1341         unsigned long delay =
1342                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1343
1344         dout("osds timeout\n");
1345         down_read(&osdc->map_sem);
1346         remove_old_osds(osdc);
1347         up_read(&osdc->map_sem);
1348
1349         schedule_delayed_work(&osdc->osds_timeout_work,
1350                               round_jiffies_relative(delay));
1351 }
1352
1353 static void complete_request(struct ceph_osd_request *req)
1354 {
1355         if (req->r_safe_callback)
1356                 req->r_safe_callback(req, NULL);
1357         complete_all(&req->r_safe_completion);  /* fsync waiter */
1358 }
1359
1360 /*
1361  * handle osd op reply.  either call the callback if it is specified,
1362  * or do the completion to wake up the waiting thread.
1363  */
1364 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1365                          struct ceph_connection *con)
1366 {
1367         void *p, *end;
1368         struct ceph_osd_request *req;
1369         u64 tid;
1370         int object_len;
1371         unsigned int numops;
1372         int payload_len, flags;
1373         s32 result;
1374         s32 retry_attempt;
1375         struct ceph_pg pg;
1376         int err;
1377         u32 reassert_epoch;
1378         u64 reassert_version;
1379         u32 osdmap_epoch;
1380         int already_completed;
1381         u32 bytes;
1382         unsigned int i;
1383
1384         tid = le64_to_cpu(msg->hdr.tid);
1385         dout("handle_reply %p tid %llu\n", msg, tid);
1386
1387         p = msg->front.iov_base;
1388         end = p + msg->front.iov_len;
1389
1390         ceph_decode_need(&p, end, 4, bad);
1391         object_len = ceph_decode_32(&p);
1392         ceph_decode_need(&p, end, object_len, bad);
1393         p += object_len;
1394
1395         err = ceph_decode_pgid(&p, end, &pg);
1396         if (err)
1397                 goto bad;
1398
1399         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1400         flags = ceph_decode_64(&p);
1401         result = ceph_decode_32(&p);
1402         reassert_epoch = ceph_decode_32(&p);
1403         reassert_version = ceph_decode_64(&p);
1404         osdmap_epoch = ceph_decode_32(&p);
1405
1406         /* lookup */
1407         mutex_lock(&osdc->request_mutex);
1408         req = __lookup_request(osdc, tid);
1409         if (req == NULL) {
1410                 dout("handle_reply tid %llu dne\n", tid);
1411                 goto bad_mutex;
1412         }
1413         ceph_osdc_get_request(req);
1414
1415         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1416              req, result);
1417
1418         ceph_decode_need(&p, end, 4, bad);
1419         numops = ceph_decode_32(&p);
1420         if (numops > CEPH_OSD_MAX_OP)
1421                 goto bad_put;
1422         if (numops != req->r_num_ops)
1423                 goto bad_put;
1424         payload_len = 0;
1425         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad);
1426         for (i = 0; i < numops; i++) {
1427                 struct ceph_osd_op *op = p;
1428                 int len;
1429
1430                 len = le32_to_cpu(op->payload_len);
1431                 req->r_reply_op_len[i] = len;
1432                 dout(" op %d has %d bytes\n", i, len);
1433                 payload_len += len;
1434                 p += sizeof(*op);
1435         }
1436         bytes = le32_to_cpu(msg->hdr.data_len);
1437         if (payload_len != bytes) {
1438                 pr_warning("sum of op payload lens %d != data_len %d",
1439                            payload_len, bytes);
1440                 goto bad_put;
1441         }
1442
1443         ceph_decode_need(&p, end, 4 + numops * 4, bad);
1444         retry_attempt = ceph_decode_32(&p);
1445         for (i = 0; i < numops; i++)
1446                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1447
1448         if (!req->r_got_reply) {
1449
1450                 req->r_result = result;
1451                 dout("handle_reply result %d bytes %d\n", req->r_result,
1452                      bytes);
1453                 if (req->r_result == 0)
1454                         req->r_result = bytes;
1455
1456                 /* in case this is a write and we need to replay, */
1457                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1458                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1459
1460                 req->r_got_reply = 1;
1461         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1462                 dout("handle_reply tid %llu dup ack\n", tid);
1463                 mutex_unlock(&osdc->request_mutex);
1464                 goto done;
1465         }
1466
1467         dout("handle_reply tid %llu flags %d\n", tid, flags);
1468
1469         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1470                 __register_linger_request(osdc, req);
1471
1472         /* either this is a read, or we got the safe response */
1473         if (result < 0 ||
1474             (flags & CEPH_OSD_FLAG_ONDISK) ||
1475             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1476                 __unregister_request(osdc, req);
1477
1478         already_completed = req->r_completed;
1479         req->r_completed = 1;
1480         mutex_unlock(&osdc->request_mutex);
1481         if (already_completed)
1482                 goto done;
1483
1484         if (req->r_callback)
1485                 req->r_callback(req, msg);
1486         else
1487                 complete_all(&req->r_completion);
1488
1489         if (flags & CEPH_OSD_FLAG_ONDISK)
1490                 complete_request(req);
1491
1492 done:
1493         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1494         ceph_osdc_put_request(req);
1495         return;
1496
1497 bad_put:
1498         ceph_osdc_put_request(req);
1499 bad_mutex:
1500         mutex_unlock(&osdc->request_mutex);
1501 bad:
1502         pr_err("corrupt osd_op_reply got %d %d\n",
1503                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1504         ceph_msg_dump(msg);
1505 }
1506
1507 static void reset_changed_osds(struct ceph_osd_client *osdc)
1508 {
1509         struct rb_node *p, *n;
1510
1511         for (p = rb_first(&osdc->osds); p; p = n) {
1512                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1513
1514                 n = rb_next(p);
1515                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1516                     memcmp(&osd->o_con.peer_addr,
1517                            ceph_osd_addr(osdc->osdmap,
1518                                          osd->o_osd),
1519                            sizeof(struct ceph_entity_addr)) != 0)
1520                         __reset_osd(osdc, osd);
1521         }
1522 }
1523
1524 /*
1525  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1526  * no osd, request a new map.
1527  *
1528  * Caller should hold map_sem for read.
1529  */
1530 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1531 {
1532         struct ceph_osd_request *req, *nreq;
1533         struct rb_node *p;
1534         int needmap = 0;
1535         int err;
1536
1537         dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1538         mutex_lock(&osdc->request_mutex);
1539         for (p = rb_first(&osdc->requests); p; ) {
1540                 req = rb_entry(p, struct ceph_osd_request, r_node);
1541                 p = rb_next(p);
1542
1543                 /*
1544                  * For linger requests that have not yet been
1545                  * registered, move them to the linger list; they'll
1546                  * be sent to the osd in the loop below.  Unregister
1547                  * the request before re-registering it as a linger
1548                  * request to ensure the __map_request() below
1549                  * will decide it needs to be sent.
1550                  */
1551                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1552                         dout("%p tid %llu restart on osd%d\n",
1553                              req, req->r_tid,
1554                              req->r_osd ? req->r_osd->o_osd : -1);
1555                         __unregister_request(osdc, req);
1556                         __register_linger_request(osdc, req);
1557                         continue;
1558                 }
1559
1560                 err = __map_request(osdc, req, force_resend);
1561                 if (err < 0)
1562                         continue;  /* error */
1563                 if (req->r_osd == NULL) {
1564                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1565                         needmap++;  /* request a newer map */
1566                 } else if (err > 0) {
1567                         if (!req->r_linger) {
1568                                 dout("%p tid %llu requeued on osd%d\n", req,
1569                                      req->r_tid,
1570                                      req->r_osd ? req->r_osd->o_osd : -1);
1571                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1572                         }
1573                 }
1574         }
1575
1576         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1577                                  r_linger_item) {
1578                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1579
1580                 err = __map_request(osdc, req, force_resend);
1581                 dout("__map_request returned %d\n", err);
1582                 if (err == 0)
1583                         continue;  /* no change and no osd was specified */
1584                 if (err < 0)
1585                         continue;  /* hrm! */
1586                 if (req->r_osd == NULL) {
1587                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1588                         needmap++;  /* request a newer map */
1589                         continue;
1590                 }
1591
1592                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1593                      req->r_osd ? req->r_osd->o_osd : -1);
1594                 __register_request(osdc, req);
1595                 __unregister_linger_request(osdc, req);
1596         }
1597         mutex_unlock(&osdc->request_mutex);
1598
1599         if (needmap) {
1600                 dout("%d requests for down osds, need new map\n", needmap);
1601                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1602         }
1603         reset_changed_osds(osdc);
1604 }
1605
1606
1607 /*
1608  * Process updated osd map.
1609  *
1610  * The message contains any number of incremental and full maps, normally
1611  * indicating some sort of topology change in the cluster.  Kick requests
1612  * off to different OSDs as needed.
1613  */
1614 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1615 {
1616         void *p, *end, *next;
1617         u32 nr_maps, maplen;
1618         u32 epoch;
1619         struct ceph_osdmap *newmap = NULL, *oldmap;
1620         int err;
1621         struct ceph_fsid fsid;
1622
1623         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1624         p = msg->front.iov_base;
1625         end = p + msg->front.iov_len;
1626
1627         /* verify fsid */
1628         ceph_decode_need(&p, end, sizeof(fsid), bad);
1629         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1630         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1631                 return;
1632
1633         down_write(&osdc->map_sem);
1634
1635         /* incremental maps */
1636         ceph_decode_32_safe(&p, end, nr_maps, bad);
1637         dout(" %d inc maps\n", nr_maps);
1638         while (nr_maps > 0) {
1639                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1640                 epoch = ceph_decode_32(&p);
1641                 maplen = ceph_decode_32(&p);
1642                 ceph_decode_need(&p, end, maplen, bad);
1643                 next = p + maplen;
1644                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1645                         dout("applying incremental map %u len %d\n",
1646                              epoch, maplen);
1647                         newmap = osdmap_apply_incremental(&p, next,
1648                                                           osdc->osdmap,
1649                                                           &osdc->client->msgr);
1650                         if (IS_ERR(newmap)) {
1651                                 err = PTR_ERR(newmap);
1652                                 goto bad;
1653                         }
1654                         BUG_ON(!newmap);
1655                         if (newmap != osdc->osdmap) {
1656                                 ceph_osdmap_destroy(osdc->osdmap);
1657                                 osdc->osdmap = newmap;
1658                         }
1659                         kick_requests(osdc, 0);
1660                 } else {
1661                         dout("ignoring incremental map %u len %d\n",
1662                              epoch, maplen);
1663                 }
1664                 p = next;
1665                 nr_maps--;
1666         }
1667         if (newmap)
1668                 goto done;
1669
1670         /* full maps */
1671         ceph_decode_32_safe(&p, end, nr_maps, bad);
1672         dout(" %d full maps\n", nr_maps);
1673         while (nr_maps) {
1674                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1675                 epoch = ceph_decode_32(&p);
1676                 maplen = ceph_decode_32(&p);
1677                 ceph_decode_need(&p, end, maplen, bad);
1678                 if (nr_maps > 1) {
1679                         dout("skipping non-latest full map %u len %d\n",
1680                              epoch, maplen);
1681                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1682                         dout("skipping full map %u len %d, "
1683                              "older than our %u\n", epoch, maplen,
1684                              osdc->osdmap->epoch);
1685                 } else {
1686                         int skipped_map = 0;
1687
1688                         dout("taking full map %u len %d\n", epoch, maplen);
1689                         newmap = osdmap_decode(&p, p+maplen);
1690                         if (IS_ERR(newmap)) {
1691                                 err = PTR_ERR(newmap);
1692                                 goto bad;
1693                         }
1694                         BUG_ON(!newmap);
1695                         oldmap = osdc->osdmap;
1696                         osdc->osdmap = newmap;
1697                         if (oldmap) {
1698                                 if (oldmap->epoch + 1 < newmap->epoch)
1699                                         skipped_map = 1;
1700                                 ceph_osdmap_destroy(oldmap);
1701                         }
1702                         kick_requests(osdc, skipped_map);
1703                 }
1704                 p += maplen;
1705                 nr_maps--;
1706         }
1707
1708 done:
1709         downgrade_write(&osdc->map_sem);
1710         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1711
1712         /*
1713          * subscribe to subsequent osdmap updates if full to ensure
1714          * we find out when we are no longer full and stop returning
1715          * ENOSPC.
1716          */
1717         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1718                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1719
1720         mutex_lock(&osdc->request_mutex);
1721         __send_queued(osdc);
1722         mutex_unlock(&osdc->request_mutex);
1723         up_read(&osdc->map_sem);
1724         wake_up_all(&osdc->client->auth_wq);
1725         return;
1726
1727 bad:
1728         pr_err("osdc handle_map corrupt msg\n");
1729         ceph_msg_dump(msg);
1730         up_write(&osdc->map_sem);
1731         return;
1732 }
1733
1734 /*
1735  * watch/notify callback event infrastructure
1736  *
1737  * These callbacks are used both for watch and notify operations.
1738  */
1739 static void __release_event(struct kref *kref)
1740 {
1741         struct ceph_osd_event *event =
1742                 container_of(kref, struct ceph_osd_event, kref);
1743
1744         dout("__release_event %p\n", event);
1745         kfree(event);
1746 }
1747
1748 static void get_event(struct ceph_osd_event *event)
1749 {
1750         kref_get(&event->kref);
1751 }
1752
1753 void ceph_osdc_put_event(struct ceph_osd_event *event)
1754 {
1755         kref_put(&event->kref, __release_event);
1756 }
1757 EXPORT_SYMBOL(ceph_osdc_put_event);
1758
1759 static void __insert_event(struct ceph_osd_client *osdc,
1760                              struct ceph_osd_event *new)
1761 {
1762         struct rb_node **p = &osdc->event_tree.rb_node;
1763         struct rb_node *parent = NULL;
1764         struct ceph_osd_event *event = NULL;
1765
1766         while (*p) {
1767                 parent = *p;
1768                 event = rb_entry(parent, struct ceph_osd_event, node);
1769                 if (new->cookie < event->cookie)
1770                         p = &(*p)->rb_left;
1771                 else if (new->cookie > event->cookie)
1772                         p = &(*p)->rb_right;
1773                 else
1774                         BUG();
1775         }
1776
1777         rb_link_node(&new->node, parent, p);
1778         rb_insert_color(&new->node, &osdc->event_tree);
1779 }
1780
1781 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1782                                                 u64 cookie)
1783 {
1784         struct rb_node **p = &osdc->event_tree.rb_node;
1785         struct rb_node *parent = NULL;
1786         struct ceph_osd_event *event = NULL;
1787
1788         while (*p) {
1789                 parent = *p;
1790                 event = rb_entry(parent, struct ceph_osd_event, node);
1791                 if (cookie < event->cookie)
1792                         p = &(*p)->rb_left;
1793                 else if (cookie > event->cookie)
1794                         p = &(*p)->rb_right;
1795                 else
1796                         return event;
1797         }
1798         return NULL;
1799 }
1800
1801 static void __remove_event(struct ceph_osd_event *event)
1802 {
1803         struct ceph_osd_client *osdc = event->osdc;
1804
1805         if (!RB_EMPTY_NODE(&event->node)) {
1806                 dout("__remove_event removed %p\n", event);
1807                 rb_erase(&event->node, &osdc->event_tree);
1808                 ceph_osdc_put_event(event);
1809         } else {
1810                 dout("__remove_event didn't remove %p\n", event);
1811         }
1812 }
1813
1814 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1815                            void (*event_cb)(u64, u64, u8, void *),
1816                            void *data, struct ceph_osd_event **pevent)
1817 {
1818         struct ceph_osd_event *event;
1819
1820         event = kmalloc(sizeof(*event), GFP_NOIO);
1821         if (!event)
1822                 return -ENOMEM;
1823
1824         dout("create_event %p\n", event);
1825         event->cb = event_cb;
1826         event->one_shot = 0;
1827         event->data = data;
1828         event->osdc = osdc;
1829         INIT_LIST_HEAD(&event->osd_node);
1830         RB_CLEAR_NODE(&event->node);
1831         kref_init(&event->kref);   /* one ref for us */
1832         kref_get(&event->kref);    /* one ref for the caller */
1833
1834         spin_lock(&osdc->event_lock);
1835         event->cookie = ++osdc->event_count;
1836         __insert_event(osdc, event);
1837         spin_unlock(&osdc->event_lock);
1838
1839         *pevent = event;
1840         return 0;
1841 }
1842 EXPORT_SYMBOL(ceph_osdc_create_event);
1843
1844 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1845 {
1846         struct ceph_osd_client *osdc = event->osdc;
1847
1848         dout("cancel_event %p\n", event);
1849         spin_lock(&osdc->event_lock);
1850         __remove_event(event);
1851         spin_unlock(&osdc->event_lock);
1852         ceph_osdc_put_event(event); /* caller's */
1853 }
1854 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1855
1856
1857 static void do_event_work(struct work_struct *work)
1858 {
1859         struct ceph_osd_event_work *event_work =
1860                 container_of(work, struct ceph_osd_event_work, work);
1861         struct ceph_osd_event *event = event_work->event;
1862         u64 ver = event_work->ver;
1863         u64 notify_id = event_work->notify_id;
1864         u8 opcode = event_work->opcode;
1865
1866         dout("do_event_work completing %p\n", event);
1867         event->cb(ver, notify_id, opcode, event->data);
1868         dout("do_event_work completed %p\n", event);
1869         ceph_osdc_put_event(event);
1870         kfree(event_work);
1871 }
1872
1873
1874 /*
1875  * Process osd watch notifications
1876  */
1877 static void handle_watch_notify(struct ceph_osd_client *osdc,
1878                                 struct ceph_msg *msg)
1879 {
1880         void *p, *end;
1881         u8 proto_ver;
1882         u64 cookie, ver, notify_id;
1883         u8 opcode;
1884         struct ceph_osd_event *event;
1885         struct ceph_osd_event_work *event_work;
1886
1887         p = msg->front.iov_base;
1888         end = p + msg->front.iov_len;
1889
1890         ceph_decode_8_safe(&p, end, proto_ver, bad);
1891         ceph_decode_8_safe(&p, end, opcode, bad);
1892         ceph_decode_64_safe(&p, end, cookie, bad);
1893         ceph_decode_64_safe(&p, end, ver, bad);
1894         ceph_decode_64_safe(&p, end, notify_id, bad);
1895
1896         spin_lock(&osdc->event_lock);
1897         event = __find_event(osdc, cookie);
1898         if (event) {
1899                 BUG_ON(event->one_shot);
1900                 get_event(event);
1901         }
1902         spin_unlock(&osdc->event_lock);
1903         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1904              cookie, ver, event);
1905         if (event) {
1906                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1907                 if (!event_work) {
1908                         dout("ERROR: could not allocate event_work\n");
1909                         goto done_err;
1910                 }
1911                 INIT_WORK(&event_work->work, do_event_work);
1912                 event_work->event = event;
1913                 event_work->ver = ver;
1914                 event_work->notify_id = notify_id;
1915                 event_work->opcode = opcode;
1916                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1917                         dout("WARNING: failed to queue notify event work\n");
1918                         goto done_err;
1919                 }
1920         }
1921
1922         return;
1923
1924 done_err:
1925         ceph_osdc_put_event(event);
1926         return;
1927
1928 bad:
1929         pr_err("osdc handle_watch_notify corrupt msg\n");
1930         return;
1931 }
1932
1933 static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
1934                                 struct ceph_osd_data *osd_data)
1935 {
1936         u64 length = ceph_osd_data_length(osd_data);
1937
1938         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
1939                 BUG_ON(length > (u64) SIZE_MAX);
1940                 if (length)
1941                         ceph_msg_data_set_pages(msg, osd_data->pages,
1942                                         length, osd_data->alignment);
1943         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
1944                 BUG_ON(!length);
1945                 ceph_msg_data_set_pagelist(msg, osd_data->pagelist);
1946 #ifdef CONFIG_BLOCK
1947         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
1948                 ceph_msg_data_set_bio(msg, osd_data->bio, length);
1949 #endif
1950         } else {
1951                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
1952         }
1953 }
1954
1955 /*
1956  * build new request AND message
1957  *
1958  */
1959 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
1960                                 struct ceph_snap_context *snapc, u64 snap_id,
1961                                 struct timespec *mtime)
1962 {
1963         struct ceph_msg *msg = req->r_request;
1964         void *p;
1965         size_t msg_size;
1966         int flags = req->r_flags;
1967         u64 data_len;
1968         unsigned int i;
1969
1970         /* Set up response incoming data and request outgoing data fields */
1971
1972         ceph_osdc_msg_data_set(req->r_reply, &req->r_data_in);
1973         ceph_osdc_msg_data_set(req->r_request, &req->r_data_out);
1974
1975         req->r_snapid = snap_id;
1976         req->r_snapc = ceph_get_snap_context(snapc);
1977
1978         /* encode request */
1979         msg->hdr.version = cpu_to_le16(4);
1980
1981         p = msg->front.iov_base;
1982         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
1983         req->r_request_osdmap_epoch = p;
1984         p += 4;
1985         req->r_request_flags = p;
1986         p += 4;
1987         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
1988                 ceph_encode_timespec(p, mtime);
1989         p += sizeof(struct ceph_timespec);
1990         req->r_request_reassert_version = p;
1991         p += sizeof(struct ceph_eversion); /* will get filled in */
1992
1993         /* oloc */
1994         ceph_encode_8(&p, 4);
1995         ceph_encode_8(&p, 4);
1996         ceph_encode_32(&p, 8 + 4 + 4);
1997         req->r_request_pool = p;
1998         p += 8;
1999         ceph_encode_32(&p, -1);  /* preferred */
2000         ceph_encode_32(&p, 0);   /* key len */
2001
2002         ceph_encode_8(&p, 1);
2003         req->r_request_pgid = p;
2004         p += 8 + 4;
2005         ceph_encode_32(&p, -1);  /* preferred */
2006
2007         /* oid */
2008         ceph_encode_32(&p, req->r_oid_len);
2009         memcpy(p, req->r_oid, req->r_oid_len);
2010         dout("oid '%.*s' len %d\n", req->r_oid_len, req->r_oid, req->r_oid_len);
2011         p += req->r_oid_len;
2012
2013         /* ops--can imply data */
2014         ceph_encode_16(&p, (u16)req->r_num_ops);
2015         data_len = 0;
2016         for (i = 0; i < req->r_num_ops; i++) {
2017                 data_len += osd_req_encode_op(req, p, i);
2018                 p += sizeof(struct ceph_osd_op);
2019         }
2020
2021         /* snaps */
2022         ceph_encode_64(&p, req->r_snapid);
2023         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2024         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2025         if (req->r_snapc) {
2026                 for (i = 0; i < snapc->num_snaps; i++) {
2027                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2028                 }
2029         }
2030
2031         req->r_request_attempts = p;
2032         p += 4;
2033
2034         /* data */
2035         if (flags & CEPH_OSD_FLAG_WRITE) {
2036                 u16 data_off;
2037
2038                 /*
2039                  * The header "data_off" is a hint to the receiver
2040                  * allowing it to align received data into its
2041                  * buffers such that there's no need to re-copy
2042                  * it before writing it to disk (direct I/O).
2043                  */
2044                 data_off = (u16) (off & 0xffff);
2045                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2046         }
2047         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2048
2049         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2050         msg_size = p - msg->front.iov_base;
2051         msg->front.iov_len = msg_size;
2052         msg->hdr.front_len = cpu_to_le32(msg_size);
2053
2054         dout("build_request msg_size was %d\n", (int)msg_size);
2055 }
2056 EXPORT_SYMBOL(ceph_osdc_build_request);
2057
2058 /*
2059  * Register request, send initial attempt.
2060  */
2061 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2062                             struct ceph_osd_request *req,
2063                             bool nofail)
2064 {
2065         int rc = 0;
2066
2067         down_read(&osdc->map_sem);
2068         mutex_lock(&osdc->request_mutex);
2069         __register_request(osdc, req);
2070         WARN_ON(req->r_sent);
2071         rc = __map_request(osdc, req, 0);
2072         if (rc < 0) {
2073                 if (nofail) {
2074                         dout("osdc_start_request failed map, "
2075                                 " will retry %lld\n", req->r_tid);
2076                         rc = 0;
2077                 }
2078                 goto out_unlock;
2079         }
2080         if (req->r_osd == NULL) {
2081                 dout("send_request %p no up osds in pg\n", req);
2082                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2083         } else {
2084                 __send_queued(osdc);
2085         }
2086         rc = 0;
2087 out_unlock:
2088         mutex_unlock(&osdc->request_mutex);
2089         up_read(&osdc->map_sem);
2090         return rc;
2091 }
2092 EXPORT_SYMBOL(ceph_osdc_start_request);
2093
2094 /*
2095  * wait for a request to complete
2096  */
2097 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2098                            struct ceph_osd_request *req)
2099 {
2100         int rc;
2101
2102         rc = wait_for_completion_interruptible(&req->r_completion);
2103         if (rc < 0) {
2104                 mutex_lock(&osdc->request_mutex);
2105                 __cancel_request(req);
2106                 __unregister_request(osdc, req);
2107                 mutex_unlock(&osdc->request_mutex);
2108                 complete_request(req);
2109                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
2110                 return rc;
2111         }
2112
2113         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
2114         return req->r_result;
2115 }
2116 EXPORT_SYMBOL(ceph_osdc_wait_request);
2117
2118 /*
2119  * sync - wait for all in-flight requests to flush.  avoid starvation.
2120  */
2121 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2122 {
2123         struct ceph_osd_request *req;
2124         u64 last_tid, next_tid = 0;
2125
2126         mutex_lock(&osdc->request_mutex);
2127         last_tid = osdc->last_tid;
2128         while (1) {
2129                 req = __lookup_request_ge(osdc, next_tid);
2130                 if (!req)
2131                         break;
2132                 if (req->r_tid > last_tid)
2133                         break;
2134
2135                 next_tid = req->r_tid + 1;
2136                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2137                         continue;
2138
2139                 ceph_osdc_get_request(req);
2140                 mutex_unlock(&osdc->request_mutex);
2141                 dout("sync waiting on tid %llu (last is %llu)\n",
2142                      req->r_tid, last_tid);
2143                 wait_for_completion(&req->r_safe_completion);
2144                 mutex_lock(&osdc->request_mutex);
2145                 ceph_osdc_put_request(req);
2146         }
2147         mutex_unlock(&osdc->request_mutex);
2148         dout("sync done (thru tid %llu)\n", last_tid);
2149 }
2150 EXPORT_SYMBOL(ceph_osdc_sync);
2151
2152 /*
2153  * init, shutdown
2154  */
2155 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2156 {
2157         int err;
2158
2159         dout("init\n");
2160         osdc->client = client;
2161         osdc->osdmap = NULL;
2162         init_rwsem(&osdc->map_sem);
2163         init_completion(&osdc->map_waiters);
2164         osdc->last_requested_map = 0;
2165         mutex_init(&osdc->request_mutex);
2166         osdc->last_tid = 0;
2167         osdc->osds = RB_ROOT;
2168         INIT_LIST_HEAD(&osdc->osd_lru);
2169         osdc->requests = RB_ROOT;
2170         INIT_LIST_HEAD(&osdc->req_lru);
2171         INIT_LIST_HEAD(&osdc->req_unsent);
2172         INIT_LIST_HEAD(&osdc->req_notarget);
2173         INIT_LIST_HEAD(&osdc->req_linger);
2174         osdc->num_requests = 0;
2175         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2176         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2177         spin_lock_init(&osdc->event_lock);
2178         osdc->event_tree = RB_ROOT;
2179         osdc->event_count = 0;
2180
2181         schedule_delayed_work(&osdc->osds_timeout_work,
2182            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2183
2184         err = -ENOMEM;
2185         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2186                                         sizeof(struct ceph_osd_request));
2187         if (!osdc->req_mempool)
2188                 goto out;
2189
2190         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2191                                 OSD_OP_FRONT_LEN, 10, true,
2192                                 "osd_op");
2193         if (err < 0)
2194                 goto out_mempool;
2195         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2196                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2197                                 "osd_op_reply");
2198         if (err < 0)
2199                 goto out_msgpool;
2200
2201         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2202         if (IS_ERR(osdc->notify_wq)) {
2203                 err = PTR_ERR(osdc->notify_wq);
2204                 osdc->notify_wq = NULL;
2205                 goto out_msgpool;
2206         }
2207         return 0;
2208
2209 out_msgpool:
2210         ceph_msgpool_destroy(&osdc->msgpool_op);
2211 out_mempool:
2212         mempool_destroy(osdc->req_mempool);
2213 out:
2214         return err;
2215 }
2216
2217 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2218 {
2219         flush_workqueue(osdc->notify_wq);
2220         destroy_workqueue(osdc->notify_wq);
2221         cancel_delayed_work_sync(&osdc->timeout_work);
2222         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2223         if (osdc->osdmap) {
2224                 ceph_osdmap_destroy(osdc->osdmap);
2225                 osdc->osdmap = NULL;
2226         }
2227         remove_all_osds(osdc);
2228         mempool_destroy(osdc->req_mempool);
2229         ceph_msgpool_destroy(&osdc->msgpool_op);
2230         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2231 }
2232
2233 /*
2234  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2235  * *plen.  Return number of bytes read, or error.
2236  */
2237 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2238                         struct ceph_vino vino, struct ceph_file_layout *layout,
2239                         u64 off, u64 *plen,
2240                         u32 truncate_seq, u64 truncate_size,
2241                         struct page **pages, int num_pages, int page_align)
2242 {
2243         struct ceph_osd_request *req;
2244         int rc = 0;
2245
2246         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2247              vino.snap, off, *plen);
2248         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2249                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2250                                     NULL, truncate_seq, truncate_size,
2251                                     false);
2252         if (IS_ERR(req))
2253                 return PTR_ERR(req);
2254
2255         /* it may be a short read due to an object boundary */
2256
2257         osd_req_op_extent_osd_data_pages(req, 0, false,
2258                                 pages, *plen, page_align, false, false);
2259
2260         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2261              off, *plen, *plen, page_align);
2262
2263         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2264
2265         rc = ceph_osdc_start_request(osdc, req, false);
2266         if (!rc)
2267                 rc = ceph_osdc_wait_request(osdc, req);
2268
2269         ceph_osdc_put_request(req);
2270         dout("readpages result %d\n", rc);
2271         return rc;
2272 }
2273 EXPORT_SYMBOL(ceph_osdc_readpages);
2274
2275 /*
2276  * do a synchronous write on N pages
2277  */
2278 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2279                          struct ceph_file_layout *layout,
2280                          struct ceph_snap_context *snapc,
2281                          u64 off, u64 len,
2282                          u32 truncate_seq, u64 truncate_size,
2283                          struct timespec *mtime,
2284                          struct page **pages, int num_pages)
2285 {
2286         struct ceph_osd_request *req;
2287         int rc = 0;
2288         int page_align = off & ~PAGE_MASK;
2289
2290         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2291         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2292                                     CEPH_OSD_OP_WRITE,
2293                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2294                                     snapc, truncate_seq, truncate_size,
2295                                     true);
2296         if (IS_ERR(req))
2297                 return PTR_ERR(req);
2298
2299         /* it may be a short write due to an object boundary */
2300         osd_req_op_extent_osd_data_pages(req, 0, true, pages, len, page_align,
2301                                 false, false);
2302         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2303
2304         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2305
2306         rc = ceph_osdc_start_request(osdc, req, true);
2307         if (!rc)
2308                 rc = ceph_osdc_wait_request(osdc, req);
2309
2310         ceph_osdc_put_request(req);
2311         if (rc == 0)
2312                 rc = len;
2313         dout("writepages result %d\n", rc);
2314         return rc;
2315 }
2316 EXPORT_SYMBOL(ceph_osdc_writepages);
2317
2318 /*
2319  * handle incoming message
2320  */
2321 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2322 {
2323         struct ceph_osd *osd = con->private;
2324         struct ceph_osd_client *osdc;
2325         int type = le16_to_cpu(msg->hdr.type);
2326
2327         if (!osd)
2328                 goto out;
2329         osdc = osd->o_osdc;
2330
2331         switch (type) {
2332         case CEPH_MSG_OSD_MAP:
2333                 ceph_osdc_handle_map(osdc, msg);
2334                 break;
2335         case CEPH_MSG_OSD_OPREPLY:
2336                 handle_reply(osdc, msg, con);
2337                 break;
2338         case CEPH_MSG_WATCH_NOTIFY:
2339                 handle_watch_notify(osdc, msg);
2340                 break;
2341
2342         default:
2343                 pr_err("received unknown message type %d %s\n", type,
2344                        ceph_msg_type_name(type));
2345         }
2346 out:
2347         ceph_msg_put(msg);
2348 }
2349
2350 /*
2351  * lookup and return message for incoming reply.  set up reply message
2352  * pages.
2353  */
2354 static struct ceph_msg *get_reply(struct ceph_connection *con,
2355                                   struct ceph_msg_header *hdr,
2356                                   int *skip)
2357 {
2358         struct ceph_osd *osd = con->private;
2359         struct ceph_osd_client *osdc = osd->o_osdc;
2360         struct ceph_msg *m;
2361         struct ceph_osd_request *req;
2362         int front = le32_to_cpu(hdr->front_len);
2363         int data_len = le32_to_cpu(hdr->data_len);
2364         u64 tid;
2365
2366         tid = le64_to_cpu(hdr->tid);
2367         mutex_lock(&osdc->request_mutex);
2368         req = __lookup_request(osdc, tid);
2369         if (!req) {
2370                 *skip = 1;
2371                 m = NULL;
2372                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2373                      osd->o_osd);
2374                 goto out;
2375         }
2376
2377         if (req->r_reply->con)
2378                 dout("%s revoking msg %p from old con %p\n", __func__,
2379                      req->r_reply, req->r_reply->con);
2380         ceph_msg_revoke_incoming(req->r_reply);
2381
2382         if (front > req->r_reply->front.iov_len) {
2383                 pr_warning("get_reply front %d > preallocated %d\n",
2384                            front, (int)req->r_reply->front.iov_len);
2385                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
2386                 if (!m)
2387                         goto out;
2388                 ceph_msg_put(req->r_reply);
2389                 req->r_reply = m;
2390         }
2391         m = ceph_msg_get(req->r_reply);
2392
2393         if (data_len > 0) {
2394                 struct ceph_osd_data *osd_data;
2395
2396                 /*
2397                  * XXX This is assuming there is only one op containing
2398                  * XXX page data.  Probably OK for reads, but this
2399                  * XXX ought to be done more generally.
2400                  */
2401                 osd_data = osd_req_op_extent_osd_data(req, 0, false);
2402                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2403                         if (osd_data->pages &&
2404                                 unlikely(osd_data->length < data_len)) {
2405
2406                                 pr_warning("tid %lld reply has %d bytes "
2407                                         "we had only %llu bytes ready\n",
2408                                         tid, data_len, osd_data->length);
2409                                 *skip = 1;
2410                                 ceph_msg_put(m);
2411                                 m = NULL;
2412                                 goto out;
2413                         }
2414                 }
2415         }
2416         *skip = 0;
2417         dout("get_reply tid %lld %p\n", tid, m);
2418
2419 out:
2420         mutex_unlock(&osdc->request_mutex);
2421         return m;
2422
2423 }
2424
2425 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2426                                   struct ceph_msg_header *hdr,
2427                                   int *skip)
2428 {
2429         struct ceph_osd *osd = con->private;
2430         int type = le16_to_cpu(hdr->type);
2431         int front = le32_to_cpu(hdr->front_len);
2432
2433         *skip = 0;
2434         switch (type) {
2435         case CEPH_MSG_OSD_MAP:
2436         case CEPH_MSG_WATCH_NOTIFY:
2437                 return ceph_msg_new(type, front, GFP_NOFS, false);
2438         case CEPH_MSG_OSD_OPREPLY:
2439                 return get_reply(con, hdr, skip);
2440         default:
2441                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2442                         osd->o_osd);
2443                 *skip = 1;
2444                 return NULL;
2445         }
2446 }
2447
2448 /*
2449  * Wrappers to refcount containing ceph_osd struct
2450  */
2451 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2452 {
2453         struct ceph_osd *osd = con->private;
2454         if (get_osd(osd))
2455                 return con;
2456         return NULL;
2457 }
2458
2459 static void put_osd_con(struct ceph_connection *con)
2460 {
2461         struct ceph_osd *osd = con->private;
2462         put_osd(osd);
2463 }
2464
2465 /*
2466  * authentication
2467  */
2468 /*
2469  * Note: returned pointer is the address of a structure that's
2470  * managed separately.  Caller must *not* attempt to free it.
2471  */
2472 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2473                                         int *proto, int force_new)
2474 {
2475         struct ceph_osd *o = con->private;
2476         struct ceph_osd_client *osdc = o->o_osdc;
2477         struct ceph_auth_client *ac = osdc->client->monc.auth;
2478         struct ceph_auth_handshake *auth = &o->o_auth;
2479
2480         if (force_new && auth->authorizer) {
2481                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2482                 auth->authorizer = NULL;
2483         }
2484         if (!auth->authorizer) {
2485                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2486                                                       auth);
2487                 if (ret)
2488                         return ERR_PTR(ret);
2489         } else {
2490                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2491                                                      auth);
2492                 if (ret)
2493                         return ERR_PTR(ret);
2494         }
2495         *proto = ac->protocol;
2496
2497         return auth;
2498 }
2499
2500
2501 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2502 {
2503         struct ceph_osd *o = con->private;
2504         struct ceph_osd_client *osdc = o->o_osdc;
2505         struct ceph_auth_client *ac = osdc->client->monc.auth;
2506
2507         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2508 }
2509
2510 static int invalidate_authorizer(struct ceph_connection *con)
2511 {
2512         struct ceph_osd *o = con->private;
2513         struct ceph_osd_client *osdc = o->o_osdc;
2514         struct ceph_auth_client *ac = osdc->client->monc.auth;
2515
2516         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2517         return ceph_monc_validate_auth(&osdc->client->monc);
2518 }
2519
2520 static const struct ceph_connection_operations osd_con_ops = {
2521         .get = get_osd_con,
2522         .put = put_osd_con,
2523         .dispatch = dispatch,
2524         .get_authorizer = get_authorizer,
2525         .verify_authorizer_reply = verify_authorizer_reply,
2526         .invalidate_authorizer = invalidate_authorizer,
2527         .alloc_msg = alloc_msg,
2528         .fault = osd_reset,
2529 };