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 struct kmem_cache *ceph_osd_request_cache; 26 27 static const struct ceph_connection_operations osd_con_ops; 28 29 static void __send_queued(struct ceph_osd_client *osdc); 30 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd); 31 static void __register_request(struct ceph_osd_client *osdc, 32 struct ceph_osd_request *req); 33 static void __unregister_request(struct ceph_osd_client *osdc, 34 struct ceph_osd_request *req); 35 static void __unregister_linger_request(struct ceph_osd_client *osdc, 36 struct ceph_osd_request *req); 37 static void __enqueue_request(struct ceph_osd_request *req); 38 static void __send_request(struct ceph_osd_client *osdc, 39 struct ceph_osd_request *req); 40 41 /* 42 * Implement client access to distributed object storage cluster. 43 * 44 * All data objects are stored within a cluster/cloud of OSDs, or 45 * "object storage devices." (Note that Ceph OSDs have _nothing_ to 46 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply 47 * remote daemons serving up and coordinating consistent and safe 48 * access to storage. 49 * 50 * Cluster membership and the mapping of data objects onto storage devices 51 * are described by the osd map. 52 * 53 * We keep track of pending OSD requests (read, write), resubmit 54 * requests to different OSDs when the cluster topology/data layout 55 * change, or retry the affected requests when the communications 56 * channel with an OSD is reset. 57 */ 58 59 /* 60 * calculate the mapping of a file extent onto an object, and fill out the 61 * request accordingly. shorten extent as necessary if it crosses an 62 * object boundary. 63 * 64 * fill osd op in request message. 65 */ 66 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen, 67 u64 *objnum, u64 *objoff, u64 *objlen) 68 { 69 u64 orig_len = *plen; 70 int r; 71 72 /* object extent? */ 73 r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum, 74 objoff, objlen); 75 if (r < 0) 76 return r; 77 if (*objlen < orig_len) { 78 *plen = *objlen; 79 dout(" skipping last %llu, final file extent %llu~%llu\n", 80 orig_len - *plen, off, *plen); 81 } 82 83 dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen); 84 85 return 0; 86 } 87 88 static void ceph_osd_data_init(struct ceph_osd_data *osd_data) 89 { 90 memset(osd_data, 0, sizeof (*osd_data)); 91 osd_data->type = CEPH_OSD_DATA_TYPE_NONE; 92 } 93 94 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data, 95 struct page **pages, u64 length, u32 alignment, 96 bool pages_from_pool, bool own_pages) 97 { 98 osd_data->type = CEPH_OSD_DATA_TYPE_PAGES; 99 osd_data->pages = pages; 100 osd_data->length = length; 101 osd_data->alignment = alignment; 102 osd_data->pages_from_pool = pages_from_pool; 103 osd_data->own_pages = own_pages; 104 } 105 106 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data, 107 struct ceph_pagelist *pagelist) 108 { 109 osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST; 110 osd_data->pagelist = pagelist; 111 } 112 113 #ifdef CONFIG_BLOCK 114 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data, 115 struct bio *bio, size_t bio_length) 116 { 117 osd_data->type = CEPH_OSD_DATA_TYPE_BIO; 118 osd_data->bio = bio; 119 osd_data->bio_length = bio_length; 120 } 121 #endif /* CONFIG_BLOCK */ 122 123 #define osd_req_op_data(oreq, whch, typ, fld) \ 124 ({ \ 125 BUG_ON(whch >= (oreq)->r_num_ops); \ 126 &(oreq)->r_ops[whch].typ.fld; \ 127 }) 128 129 static struct ceph_osd_data * 130 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which) 131 { 132 BUG_ON(which >= osd_req->r_num_ops); 133 134 return &osd_req->r_ops[which].raw_data_in; 135 } 136 137 struct ceph_osd_data * 138 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req, 139 unsigned int which) 140 { 141 return osd_req_op_data(osd_req, which, extent, osd_data); 142 } 143 EXPORT_SYMBOL(osd_req_op_extent_osd_data); 144 145 struct ceph_osd_data * 146 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req, 147 unsigned int which) 148 { 149 return osd_req_op_data(osd_req, which, cls, response_data); 150 } 151 EXPORT_SYMBOL(osd_req_op_cls_response_data); /* ??? */ 152 153 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req, 154 unsigned int which, struct page **pages, 155 u64 length, u32 alignment, 156 bool pages_from_pool, bool own_pages) 157 { 158 struct ceph_osd_data *osd_data; 159 160 osd_data = osd_req_op_raw_data_in(osd_req, which); 161 ceph_osd_data_pages_init(osd_data, pages, length, alignment, 162 pages_from_pool, own_pages); 163 } 164 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages); 165 166 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req, 167 unsigned int which, struct page **pages, 168 u64 length, u32 alignment, 169 bool pages_from_pool, bool own_pages) 170 { 171 struct ceph_osd_data *osd_data; 172 173 osd_data = osd_req_op_data(osd_req, which, extent, osd_data); 174 ceph_osd_data_pages_init(osd_data, pages, length, alignment, 175 pages_from_pool, own_pages); 176 } 177 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages); 178 179 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req, 180 unsigned int which, struct ceph_pagelist *pagelist) 181 { 182 struct ceph_osd_data *osd_data; 183 184 osd_data = osd_req_op_data(osd_req, which, extent, osd_data); 185 ceph_osd_data_pagelist_init(osd_data, pagelist); 186 } 187 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist); 188 189 #ifdef CONFIG_BLOCK 190 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req, 191 unsigned int which, struct bio *bio, size_t bio_length) 192 { 193 struct ceph_osd_data *osd_data; 194 195 osd_data = osd_req_op_data(osd_req, which, extent, osd_data); 196 ceph_osd_data_bio_init(osd_data, bio, bio_length); 197 } 198 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio); 199 #endif /* CONFIG_BLOCK */ 200 201 static void osd_req_op_cls_request_info_pagelist( 202 struct ceph_osd_request *osd_req, 203 unsigned int which, struct ceph_pagelist *pagelist) 204 { 205 struct ceph_osd_data *osd_data; 206 207 osd_data = osd_req_op_data(osd_req, which, cls, request_info); 208 ceph_osd_data_pagelist_init(osd_data, pagelist); 209 } 210 211 void osd_req_op_cls_request_data_pagelist( 212 struct ceph_osd_request *osd_req, 213 unsigned int which, struct ceph_pagelist *pagelist) 214 { 215 struct ceph_osd_data *osd_data; 216 217 osd_data = osd_req_op_data(osd_req, which, cls, request_data); 218 ceph_osd_data_pagelist_init(osd_data, pagelist); 219 } 220 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist); 221 222 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req, 223 unsigned int which, struct page **pages, u64 length, 224 u32 alignment, bool pages_from_pool, bool own_pages) 225 { 226 struct ceph_osd_data *osd_data; 227 228 osd_data = osd_req_op_data(osd_req, which, cls, request_data); 229 ceph_osd_data_pages_init(osd_data, pages, length, alignment, 230 pages_from_pool, own_pages); 231 } 232 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages); 233 234 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req, 235 unsigned int which, struct page **pages, u64 length, 236 u32 alignment, bool pages_from_pool, bool own_pages) 237 { 238 struct ceph_osd_data *osd_data; 239 240 osd_data = osd_req_op_data(osd_req, which, cls, response_data); 241 ceph_osd_data_pages_init(osd_data, pages, length, alignment, 242 pages_from_pool, own_pages); 243 } 244 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages); 245 246 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data) 247 { 248 switch (osd_data->type) { 249 case CEPH_OSD_DATA_TYPE_NONE: 250 return 0; 251 case CEPH_OSD_DATA_TYPE_PAGES: 252 return osd_data->length; 253 case CEPH_OSD_DATA_TYPE_PAGELIST: 254 return (u64)osd_data->pagelist->length; 255 #ifdef CONFIG_BLOCK 256 case CEPH_OSD_DATA_TYPE_BIO: 257 return (u64)osd_data->bio_length; 258 #endif /* CONFIG_BLOCK */ 259 default: 260 WARN(true, "unrecognized data type %d\n", (int)osd_data->type); 261 return 0; 262 } 263 } 264 265 static void ceph_osd_data_release(struct ceph_osd_data *osd_data) 266 { 267 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) { 268 int num_pages; 269 270 num_pages = calc_pages_for((u64)osd_data->alignment, 271 (u64)osd_data->length); 272 ceph_release_page_vector(osd_data->pages, num_pages); 273 } 274 ceph_osd_data_init(osd_data); 275 } 276 277 static void osd_req_op_data_release(struct ceph_osd_request *osd_req, 278 unsigned int which) 279 { 280 struct ceph_osd_req_op *op; 281 282 BUG_ON(which >= osd_req->r_num_ops); 283 op = &osd_req->r_ops[which]; 284 285 switch (op->op) { 286 case CEPH_OSD_OP_READ: 287 case CEPH_OSD_OP_WRITE: 288 ceph_osd_data_release(&op->extent.osd_data); 289 break; 290 case CEPH_OSD_OP_CALL: 291 ceph_osd_data_release(&op->cls.request_info); 292 ceph_osd_data_release(&op->cls.request_data); 293 ceph_osd_data_release(&op->cls.response_data); 294 break; 295 case CEPH_OSD_OP_SETXATTR: 296 case CEPH_OSD_OP_CMPXATTR: 297 ceph_osd_data_release(&op->xattr.osd_data); 298 break; 299 case CEPH_OSD_OP_STAT: 300 ceph_osd_data_release(&op->raw_data_in); 301 break; 302 default: 303 break; 304 } 305 } 306 307 /* 308 * requests 309 */ 310 static void ceph_osdc_release_request(struct kref *kref) 311 { 312 struct ceph_osd_request *req = container_of(kref, 313 struct ceph_osd_request, r_kref); 314 unsigned int which; 315 316 dout("%s %p (r_request %p r_reply %p)\n", __func__, req, 317 req->r_request, req->r_reply); 318 WARN_ON(!RB_EMPTY_NODE(&req->r_node)); 319 WARN_ON(!list_empty(&req->r_req_lru_item)); 320 WARN_ON(!list_empty(&req->r_osd_item)); 321 WARN_ON(!list_empty(&req->r_linger_item)); 322 WARN_ON(!list_empty(&req->r_linger_osd_item)); 323 WARN_ON(req->r_osd); 324 325 if (req->r_request) 326 ceph_msg_put(req->r_request); 327 if (req->r_reply) { 328 ceph_msg_revoke_incoming(req->r_reply); 329 ceph_msg_put(req->r_reply); 330 } 331 332 for (which = 0; which < req->r_num_ops; which++) 333 osd_req_op_data_release(req, which); 334 335 ceph_put_snap_context(req->r_snapc); 336 if (req->r_mempool) 337 mempool_free(req, req->r_osdc->req_mempool); 338 else 339 kmem_cache_free(ceph_osd_request_cache, req); 340 341 } 342 343 void ceph_osdc_get_request(struct ceph_osd_request *req) 344 { 345 dout("%s %p (was %d)\n", __func__, req, 346 atomic_read(&req->r_kref.refcount)); 347 kref_get(&req->r_kref); 348 } 349 EXPORT_SYMBOL(ceph_osdc_get_request); 350 351 void ceph_osdc_put_request(struct ceph_osd_request *req) 352 { 353 dout("%s %p (was %d)\n", __func__, req, 354 atomic_read(&req->r_kref.refcount)); 355 kref_put(&req->r_kref, ceph_osdc_release_request); 356 } 357 EXPORT_SYMBOL(ceph_osdc_put_request); 358 359 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc, 360 struct ceph_snap_context *snapc, 361 unsigned int num_ops, 362 bool use_mempool, 363 gfp_t gfp_flags) 364 { 365 struct ceph_osd_request *req; 366 struct ceph_msg *msg; 367 size_t msg_size; 368 369 BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX); 370 BUG_ON(num_ops > CEPH_OSD_MAX_OP); 371 372 msg_size = 4 + 4 + 8 + 8 + 4+8; 373 msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */ 374 msg_size += 1 + 8 + 4 + 4; /* pg_t */ 375 msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */ 376 msg_size += 2 + num_ops*sizeof(struct ceph_osd_op); 377 msg_size += 8; /* snapid */ 378 msg_size += 8; /* snap_seq */ 379 msg_size += 8 * (snapc ? snapc->num_snaps : 0); /* snaps */ 380 msg_size += 4; 381 382 if (use_mempool) { 383 req = mempool_alloc(osdc->req_mempool, gfp_flags); 384 memset(req, 0, sizeof(*req)); 385 } else { 386 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags); 387 } 388 if (req == NULL) 389 return NULL; 390 391 req->r_osdc = osdc; 392 req->r_mempool = use_mempool; 393 req->r_num_ops = num_ops; 394 395 kref_init(&req->r_kref); 396 init_completion(&req->r_completion); 397 init_completion(&req->r_safe_completion); 398 RB_CLEAR_NODE(&req->r_node); 399 INIT_LIST_HEAD(&req->r_unsafe_item); 400 INIT_LIST_HEAD(&req->r_linger_item); 401 INIT_LIST_HEAD(&req->r_linger_osd_item); 402 INIT_LIST_HEAD(&req->r_req_lru_item); 403 INIT_LIST_HEAD(&req->r_osd_item); 404 405 req->r_base_oloc.pool = -1; 406 req->r_target_oloc.pool = -1; 407 408 /* create reply message */ 409 if (use_mempool) 410 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0); 411 else 412 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, 413 OSD_OPREPLY_FRONT_LEN, gfp_flags, true); 414 if (!msg) { 415 ceph_osdc_put_request(req); 416 return NULL; 417 } 418 req->r_reply = msg; 419 420 /* create request message; allow space for oid */ 421 if (use_mempool) 422 msg = ceph_msgpool_get(&osdc->msgpool_op, 0); 423 else 424 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true); 425 if (!msg) { 426 ceph_osdc_put_request(req); 427 return NULL; 428 } 429 430 memset(msg->front.iov_base, 0, msg->front.iov_len); 431 432 req->r_request = msg; 433 434 return req; 435 } 436 EXPORT_SYMBOL(ceph_osdc_alloc_request); 437 438 static bool osd_req_opcode_valid(u16 opcode) 439 { 440 switch (opcode) { 441 #define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return true; 442 __CEPH_FORALL_OSD_OPS(GENERATE_CASE) 443 #undef GENERATE_CASE 444 default: 445 return false; 446 } 447 } 448 449 /* 450 * This is an osd op init function for opcodes that have no data or 451 * other information associated with them. It also serves as a 452 * common init routine for all the other init functions, below. 453 */ 454 static struct ceph_osd_req_op * 455 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which, 456 u16 opcode, u32 flags) 457 { 458 struct ceph_osd_req_op *op; 459 460 BUG_ON(which >= osd_req->r_num_ops); 461 BUG_ON(!osd_req_opcode_valid(opcode)); 462 463 op = &osd_req->r_ops[which]; 464 memset(op, 0, sizeof (*op)); 465 op->op = opcode; 466 op->flags = flags; 467 468 return op; 469 } 470 471 void osd_req_op_init(struct ceph_osd_request *osd_req, 472 unsigned int which, u16 opcode, u32 flags) 473 { 474 (void)_osd_req_op_init(osd_req, which, opcode, flags); 475 } 476 EXPORT_SYMBOL(osd_req_op_init); 477 478 void osd_req_op_extent_init(struct ceph_osd_request *osd_req, 479 unsigned int which, u16 opcode, 480 u64 offset, u64 length, 481 u64 truncate_size, u32 truncate_seq) 482 { 483 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, 484 opcode, 0); 485 size_t payload_len = 0; 486 487 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE && 488 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE); 489 490 op->extent.offset = offset; 491 op->extent.length = length; 492 op->extent.truncate_size = truncate_size; 493 op->extent.truncate_seq = truncate_seq; 494 if (opcode == CEPH_OSD_OP_WRITE) 495 payload_len += length; 496 497 op->payload_len = payload_len; 498 } 499 EXPORT_SYMBOL(osd_req_op_extent_init); 500 501 void osd_req_op_extent_update(struct ceph_osd_request *osd_req, 502 unsigned int which, u64 length) 503 { 504 struct ceph_osd_req_op *op; 505 u64 previous; 506 507 BUG_ON(which >= osd_req->r_num_ops); 508 op = &osd_req->r_ops[which]; 509 previous = op->extent.length; 510 511 if (length == previous) 512 return; /* Nothing to do */ 513 BUG_ON(length > previous); 514 515 op->extent.length = length; 516 op->payload_len -= previous - length; 517 } 518 EXPORT_SYMBOL(osd_req_op_extent_update); 519 520 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which, 521 u16 opcode, const char *class, const char *method) 522 { 523 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, 524 opcode, 0); 525 struct ceph_pagelist *pagelist; 526 size_t payload_len = 0; 527 size_t size; 528 529 BUG_ON(opcode != CEPH_OSD_OP_CALL); 530 531 pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS); 532 BUG_ON(!pagelist); 533 ceph_pagelist_init(pagelist); 534 535 op->cls.class_name = class; 536 size = strlen(class); 537 BUG_ON(size > (size_t) U8_MAX); 538 op->cls.class_len = size; 539 ceph_pagelist_append(pagelist, class, size); 540 payload_len += size; 541 542 op->cls.method_name = method; 543 size = strlen(method); 544 BUG_ON(size > (size_t) U8_MAX); 545 op->cls.method_len = size; 546 ceph_pagelist_append(pagelist, method, size); 547 payload_len += size; 548 549 osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist); 550 551 op->cls.argc = 0; /* currently unused */ 552 553 op->payload_len = payload_len; 554 } 555 EXPORT_SYMBOL(osd_req_op_cls_init); 556 557 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which, 558 u16 opcode, const char *name, const void *value, 559 size_t size, u8 cmp_op, u8 cmp_mode) 560 { 561 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, 562 opcode, 0); 563 struct ceph_pagelist *pagelist; 564 size_t payload_len; 565 566 BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR); 567 568 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); 569 if (!pagelist) 570 return -ENOMEM; 571 572 ceph_pagelist_init(pagelist); 573 574 payload_len = strlen(name); 575 op->xattr.name_len = payload_len; 576 ceph_pagelist_append(pagelist, name, payload_len); 577 578 op->xattr.value_len = size; 579 ceph_pagelist_append(pagelist, value, size); 580 payload_len += size; 581 582 op->xattr.cmp_op = cmp_op; 583 op->xattr.cmp_mode = cmp_mode; 584 585 ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist); 586 op->payload_len = payload_len; 587 return 0; 588 } 589 EXPORT_SYMBOL(osd_req_op_xattr_init); 590 591 void osd_req_op_watch_init(struct ceph_osd_request *osd_req, 592 unsigned int which, u16 opcode, 593 u64 cookie, u64 version, int flag) 594 { 595 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, 596 opcode, 0); 597 598 BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH); 599 600 op->watch.cookie = cookie; 601 op->watch.ver = version; 602 if (opcode == CEPH_OSD_OP_WATCH && flag) 603 op->watch.flag = (u8)1; 604 } 605 EXPORT_SYMBOL(osd_req_op_watch_init); 606 607 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req, 608 unsigned int which, 609 u64 expected_object_size, 610 u64 expected_write_size) 611 { 612 struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, 613 CEPH_OSD_OP_SETALLOCHINT, 614 0); 615 616 op->alloc_hint.expected_object_size = expected_object_size; 617 op->alloc_hint.expected_write_size = expected_write_size; 618 619 /* 620 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed 621 * not worth a feature bit. Set FAILOK per-op flag to make 622 * sure older osds don't trip over an unsupported opcode. 623 */ 624 op->flags |= CEPH_OSD_OP_FLAG_FAILOK; 625 } 626 EXPORT_SYMBOL(osd_req_op_alloc_hint_init); 627 628 static void ceph_osdc_msg_data_add(struct ceph_msg *msg, 629 struct ceph_osd_data *osd_data) 630 { 631 u64 length = ceph_osd_data_length(osd_data); 632 633 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) { 634 BUG_ON(length > (u64) SIZE_MAX); 635 if (length) 636 ceph_msg_data_add_pages(msg, osd_data->pages, 637 length, osd_data->alignment); 638 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) { 639 BUG_ON(!length); 640 ceph_msg_data_add_pagelist(msg, osd_data->pagelist); 641 #ifdef CONFIG_BLOCK 642 } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) { 643 ceph_msg_data_add_bio(msg, osd_data->bio, length); 644 #endif 645 } else { 646 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE); 647 } 648 } 649 650 static u64 osd_req_encode_op(struct ceph_osd_request *req, 651 struct ceph_osd_op *dst, unsigned int which) 652 { 653 struct ceph_osd_req_op *src; 654 struct ceph_osd_data *osd_data; 655 u64 request_data_len = 0; 656 u64 data_length; 657 658 BUG_ON(which >= req->r_num_ops); 659 src = &req->r_ops[which]; 660 if (WARN_ON(!osd_req_opcode_valid(src->op))) { 661 pr_err("unrecognized osd opcode %d\n", src->op); 662 663 return 0; 664 } 665 666 switch (src->op) { 667 case CEPH_OSD_OP_STAT: 668 osd_data = &src->raw_data_in; 669 ceph_osdc_msg_data_add(req->r_reply, osd_data); 670 break; 671 case CEPH_OSD_OP_READ: 672 case CEPH_OSD_OP_WRITE: 673 case CEPH_OSD_OP_ZERO: 674 case CEPH_OSD_OP_TRUNCATE: 675 if (src->op == CEPH_OSD_OP_WRITE) 676 request_data_len = src->extent.length; 677 dst->extent.offset = cpu_to_le64(src->extent.offset); 678 dst->extent.length = cpu_to_le64(src->extent.length); 679 dst->extent.truncate_size = 680 cpu_to_le64(src->extent.truncate_size); 681 dst->extent.truncate_seq = 682 cpu_to_le32(src->extent.truncate_seq); 683 osd_data = &src->extent.osd_data; 684 if (src->op == CEPH_OSD_OP_WRITE) 685 ceph_osdc_msg_data_add(req->r_request, osd_data); 686 else 687 ceph_osdc_msg_data_add(req->r_reply, osd_data); 688 break; 689 case CEPH_OSD_OP_CALL: 690 dst->cls.class_len = src->cls.class_len; 691 dst->cls.method_len = src->cls.method_len; 692 osd_data = &src->cls.request_info; 693 ceph_osdc_msg_data_add(req->r_request, osd_data); 694 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST); 695 request_data_len = osd_data->pagelist->length; 696 697 osd_data = &src->cls.request_data; 698 data_length = ceph_osd_data_length(osd_data); 699 if (data_length) { 700 BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE); 701 dst->cls.indata_len = cpu_to_le32(data_length); 702 ceph_osdc_msg_data_add(req->r_request, osd_data); 703 src->payload_len += data_length; 704 request_data_len += data_length; 705 } 706 osd_data = &src->cls.response_data; 707 ceph_osdc_msg_data_add(req->r_reply, osd_data); 708 break; 709 case CEPH_OSD_OP_STARTSYNC: 710 break; 711 case CEPH_OSD_OP_NOTIFY_ACK: 712 case CEPH_OSD_OP_WATCH: 713 dst->watch.cookie = cpu_to_le64(src->watch.cookie); 714 dst->watch.ver = cpu_to_le64(src->watch.ver); 715 dst->watch.flag = src->watch.flag; 716 break; 717 case CEPH_OSD_OP_SETALLOCHINT: 718 dst->alloc_hint.expected_object_size = 719 cpu_to_le64(src->alloc_hint.expected_object_size); 720 dst->alloc_hint.expected_write_size = 721 cpu_to_le64(src->alloc_hint.expected_write_size); 722 break; 723 case CEPH_OSD_OP_SETXATTR: 724 case CEPH_OSD_OP_CMPXATTR: 725 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len); 726 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len); 727 dst->xattr.cmp_op = src->xattr.cmp_op; 728 dst->xattr.cmp_mode = src->xattr.cmp_mode; 729 osd_data = &src->xattr.osd_data; 730 ceph_osdc_msg_data_add(req->r_request, osd_data); 731 request_data_len = osd_data->pagelist->length; 732 break; 733 case CEPH_OSD_OP_CREATE: 734 case CEPH_OSD_OP_DELETE: 735 break; 736 default: 737 pr_err("unsupported osd opcode %s\n", 738 ceph_osd_op_name(src->op)); 739 WARN_ON(1); 740 741 return 0; 742 } 743 744 dst->op = cpu_to_le16(src->op); 745 dst->flags = cpu_to_le32(src->flags); 746 dst->payload_len = cpu_to_le32(src->payload_len); 747 748 return request_data_len; 749 } 750 751 /* 752 * build new request AND message, calculate layout, and adjust file 753 * extent as needed. 754 * 755 * if the file was recently truncated, we include information about its 756 * old and new size so that the object can be updated appropriately. (we 757 * avoid synchronously deleting truncated objects because it's slow.) 758 * 759 * if @do_sync, include a 'startsync' command so that the osd will flush 760 * data quickly. 761 */ 762 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc, 763 struct ceph_file_layout *layout, 764 struct ceph_vino vino, 765 u64 off, u64 *plen, 766 unsigned int which, int num_ops, 767 int opcode, int flags, 768 struct ceph_snap_context *snapc, 769 u32 truncate_seq, 770 u64 truncate_size, 771 bool use_mempool) 772 { 773 struct ceph_osd_request *req; 774 u64 objnum = 0; 775 u64 objoff = 0; 776 u64 objlen = 0; 777 int r; 778 779 BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE && 780 opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE && 781 opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE); 782 783 req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool, 784 GFP_NOFS); 785 if (!req) 786 return ERR_PTR(-ENOMEM); 787 788 req->r_flags = flags; 789 790 /* calculate max write size */ 791 r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen); 792 if (r < 0) { 793 ceph_osdc_put_request(req); 794 return ERR_PTR(r); 795 } 796 797 if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) { 798 osd_req_op_init(req, which, opcode, 0); 799 } else { 800 u32 object_size = le32_to_cpu(layout->fl_object_size); 801 u32 object_base = off - objoff; 802 if (!(truncate_seq == 1 && truncate_size == -1ULL)) { 803 if (truncate_size <= object_base) { 804 truncate_size = 0; 805 } else { 806 truncate_size -= object_base; 807 if (truncate_size > object_size) 808 truncate_size = object_size; 809 } 810 } 811 osd_req_op_extent_init(req, which, opcode, objoff, objlen, 812 truncate_size, truncate_seq); 813 } 814 815 req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout); 816 817 snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name), 818 "%llx.%08llx", vino.ino, objnum); 819 req->r_base_oid.name_len = strlen(req->r_base_oid.name); 820 821 return req; 822 } 823 EXPORT_SYMBOL(ceph_osdc_new_request); 824 825 /* 826 * We keep osd requests in an rbtree, sorted by ->r_tid. 827 */ 828 static void __insert_request(struct ceph_osd_client *osdc, 829 struct ceph_osd_request *new) 830 { 831 struct rb_node **p = &osdc->requests.rb_node; 832 struct rb_node *parent = NULL; 833 struct ceph_osd_request *req = NULL; 834 835 while (*p) { 836 parent = *p; 837 req = rb_entry(parent, struct ceph_osd_request, r_node); 838 if (new->r_tid < req->r_tid) 839 p = &(*p)->rb_left; 840 else if (new->r_tid > req->r_tid) 841 p = &(*p)->rb_right; 842 else 843 BUG(); 844 } 845 846 rb_link_node(&new->r_node, parent, p); 847 rb_insert_color(&new->r_node, &osdc->requests); 848 } 849 850 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc, 851 u64 tid) 852 { 853 struct ceph_osd_request *req; 854 struct rb_node *n = osdc->requests.rb_node; 855 856 while (n) { 857 req = rb_entry(n, struct ceph_osd_request, r_node); 858 if (tid < req->r_tid) 859 n = n->rb_left; 860 else if (tid > req->r_tid) 861 n = n->rb_right; 862 else 863 return req; 864 } 865 return NULL; 866 } 867 868 static struct ceph_osd_request * 869 __lookup_request_ge(struct ceph_osd_client *osdc, 870 u64 tid) 871 { 872 struct ceph_osd_request *req; 873 struct rb_node *n = osdc->requests.rb_node; 874 875 while (n) { 876 req = rb_entry(n, struct ceph_osd_request, r_node); 877 if (tid < req->r_tid) { 878 if (!n->rb_left) 879 return req; 880 n = n->rb_left; 881 } else if (tid > req->r_tid) { 882 n = n->rb_right; 883 } else { 884 return req; 885 } 886 } 887 return NULL; 888 } 889 890 static void __kick_linger_request(struct ceph_osd_request *req) 891 { 892 struct ceph_osd_client *osdc = req->r_osdc; 893 struct ceph_osd *osd = req->r_osd; 894 895 /* 896 * Linger requests need to be resent with a new tid to avoid 897 * the dup op detection logic on the OSDs. Achieve this with 898 * a re-register dance instead of open-coding. 899 */ 900 ceph_osdc_get_request(req); 901 if (!list_empty(&req->r_linger_item)) 902 __unregister_linger_request(osdc, req); 903 else 904 __unregister_request(osdc, req); 905 __register_request(osdc, req); 906 ceph_osdc_put_request(req); 907 908 /* 909 * Unless request has been registered as both normal and 910 * lingering, __unregister{,_linger}_request clears r_osd. 911 * However, here we need to preserve r_osd to make sure we 912 * requeue on the same OSD. 913 */ 914 WARN_ON(req->r_osd || !osd); 915 req->r_osd = osd; 916 917 dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid); 918 __enqueue_request(req); 919 } 920 921 /* 922 * Resubmit requests pending on the given osd. 923 */ 924 static void __kick_osd_requests(struct ceph_osd_client *osdc, 925 struct ceph_osd *osd) 926 { 927 struct ceph_osd_request *req, *nreq; 928 LIST_HEAD(resend); 929 LIST_HEAD(resend_linger); 930 int err; 931 932 dout("%s osd%d\n", __func__, osd->o_osd); 933 err = __reset_osd(osdc, osd); 934 if (err) 935 return; 936 937 /* 938 * Build up a list of requests to resend by traversing the 939 * osd's list of requests. Requests for a given object are 940 * sent in tid order, and that is also the order they're 941 * kept on this list. Therefore all requests that are in 942 * flight will be found first, followed by all requests that 943 * have not yet been sent. And to resend requests while 944 * preserving this order we will want to put any sent 945 * requests back on the front of the osd client's unsent 946 * list. 947 * 948 * So we build a separate ordered list of already-sent 949 * requests for the affected osd and splice it onto the 950 * front of the osd client's unsent list. Once we've seen a 951 * request that has not yet been sent we're done. Those 952 * requests are already sitting right where they belong. 953 */ 954 list_for_each_entry(req, &osd->o_requests, r_osd_item) { 955 if (!req->r_sent) 956 break; 957 958 if (!req->r_linger) { 959 dout("%s requeueing %p tid %llu\n", __func__, req, 960 req->r_tid); 961 list_move_tail(&req->r_req_lru_item, &resend); 962 req->r_flags |= CEPH_OSD_FLAG_RETRY; 963 } else { 964 list_move_tail(&req->r_req_lru_item, &resend_linger); 965 } 966 } 967 list_splice(&resend, &osdc->req_unsent); 968 969 /* 970 * Both registered and not yet registered linger requests are 971 * enqueued with a new tid on the same OSD. We add/move them 972 * to req_unsent/o_requests at the end to keep things in tid 973 * order. 974 */ 975 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests, 976 r_linger_osd_item) { 977 WARN_ON(!list_empty(&req->r_req_lru_item)); 978 __kick_linger_request(req); 979 } 980 981 list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item) 982 __kick_linger_request(req); 983 } 984 985 /* 986 * If the osd connection drops, we need to resubmit all requests. 987 */ 988 static void osd_reset(struct ceph_connection *con) 989 { 990 struct ceph_osd *osd = con->private; 991 struct ceph_osd_client *osdc; 992 993 if (!osd) 994 return; 995 dout("osd_reset osd%d\n", osd->o_osd); 996 osdc = osd->o_osdc; 997 down_read(&osdc->map_sem); 998 mutex_lock(&osdc->request_mutex); 999 __kick_osd_requests(osdc, osd); 1000 __send_queued(osdc); 1001 mutex_unlock(&osdc->request_mutex); 1002 up_read(&osdc->map_sem); 1003 } 1004 1005 /* 1006 * Track open sessions with osds. 1007 */ 1008 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum) 1009 { 1010 struct ceph_osd *osd; 1011 1012 osd = kzalloc(sizeof(*osd), GFP_NOFS); 1013 if (!osd) 1014 return NULL; 1015 1016 atomic_set(&osd->o_ref, 1); 1017 osd->o_osdc = osdc; 1018 osd->o_osd = onum; 1019 RB_CLEAR_NODE(&osd->o_node); 1020 INIT_LIST_HEAD(&osd->o_requests); 1021 INIT_LIST_HEAD(&osd->o_linger_requests); 1022 INIT_LIST_HEAD(&osd->o_osd_lru); 1023 osd->o_incarnation = 1; 1024 1025 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr); 1026 1027 INIT_LIST_HEAD(&osd->o_keepalive_item); 1028 return osd; 1029 } 1030 1031 static struct ceph_osd *get_osd(struct ceph_osd *osd) 1032 { 1033 if (atomic_inc_not_zero(&osd->o_ref)) { 1034 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1, 1035 atomic_read(&osd->o_ref)); 1036 return osd; 1037 } else { 1038 dout("get_osd %p FAIL\n", osd); 1039 return NULL; 1040 } 1041 } 1042 1043 static void put_osd(struct ceph_osd *osd) 1044 { 1045 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref), 1046 atomic_read(&osd->o_ref) - 1); 1047 if (atomic_dec_and_test(&osd->o_ref)) { 1048 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth; 1049 1050 if (osd->o_auth.authorizer) 1051 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer); 1052 kfree(osd); 1053 } 1054 } 1055 1056 /* 1057 * remove an osd from our map 1058 */ 1059 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd) 1060 { 1061 dout("%s %p osd%d\n", __func__, osd, osd->o_osd); 1062 WARN_ON(!list_empty(&osd->o_requests)); 1063 WARN_ON(!list_empty(&osd->o_linger_requests)); 1064 1065 list_del_init(&osd->o_osd_lru); 1066 rb_erase(&osd->o_node, &osdc->osds); 1067 RB_CLEAR_NODE(&osd->o_node); 1068 } 1069 1070 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd) 1071 { 1072 dout("%s %p osd%d\n", __func__, osd, osd->o_osd); 1073 1074 if (!RB_EMPTY_NODE(&osd->o_node)) { 1075 ceph_con_close(&osd->o_con); 1076 __remove_osd(osdc, osd); 1077 put_osd(osd); 1078 } 1079 } 1080 1081 static void remove_all_osds(struct ceph_osd_client *osdc) 1082 { 1083 dout("%s %p\n", __func__, osdc); 1084 mutex_lock(&osdc->request_mutex); 1085 while (!RB_EMPTY_ROOT(&osdc->osds)) { 1086 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds), 1087 struct ceph_osd, o_node); 1088 remove_osd(osdc, osd); 1089 } 1090 mutex_unlock(&osdc->request_mutex); 1091 } 1092 1093 static void __move_osd_to_lru(struct ceph_osd_client *osdc, 1094 struct ceph_osd *osd) 1095 { 1096 dout("%s %p\n", __func__, osd); 1097 BUG_ON(!list_empty(&osd->o_osd_lru)); 1098 1099 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru); 1100 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl; 1101 } 1102 1103 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc, 1104 struct ceph_osd *osd) 1105 { 1106 dout("%s %p\n", __func__, osd); 1107 1108 if (list_empty(&osd->o_requests) && 1109 list_empty(&osd->o_linger_requests)) 1110 __move_osd_to_lru(osdc, osd); 1111 } 1112 1113 static void __remove_osd_from_lru(struct ceph_osd *osd) 1114 { 1115 dout("__remove_osd_from_lru %p\n", osd); 1116 if (!list_empty(&osd->o_osd_lru)) 1117 list_del_init(&osd->o_osd_lru); 1118 } 1119 1120 static void remove_old_osds(struct ceph_osd_client *osdc) 1121 { 1122 struct ceph_osd *osd, *nosd; 1123 1124 dout("__remove_old_osds %p\n", osdc); 1125 mutex_lock(&osdc->request_mutex); 1126 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) { 1127 if (time_before(jiffies, osd->lru_ttl)) 1128 break; 1129 remove_osd(osdc, osd); 1130 } 1131 mutex_unlock(&osdc->request_mutex); 1132 } 1133 1134 /* 1135 * reset osd connect 1136 */ 1137 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd) 1138 { 1139 struct ceph_entity_addr *peer_addr; 1140 1141 dout("__reset_osd %p osd%d\n", osd, osd->o_osd); 1142 if (list_empty(&osd->o_requests) && 1143 list_empty(&osd->o_linger_requests)) { 1144 remove_osd(osdc, osd); 1145 return -ENODEV; 1146 } 1147 1148 peer_addr = &osdc->osdmap->osd_addr[osd->o_osd]; 1149 if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) && 1150 !ceph_con_opened(&osd->o_con)) { 1151 struct ceph_osd_request *req; 1152 1153 dout("osd addr hasn't changed and connection never opened, " 1154 "letting msgr retry\n"); 1155 /* touch each r_stamp for handle_timeout()'s benfit */ 1156 list_for_each_entry(req, &osd->o_requests, r_osd_item) 1157 req->r_stamp = jiffies; 1158 1159 return -EAGAIN; 1160 } 1161 1162 ceph_con_close(&osd->o_con); 1163 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr); 1164 osd->o_incarnation++; 1165 1166 return 0; 1167 } 1168 1169 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new) 1170 { 1171 struct rb_node **p = &osdc->osds.rb_node; 1172 struct rb_node *parent = NULL; 1173 struct ceph_osd *osd = NULL; 1174 1175 dout("__insert_osd %p osd%d\n", new, new->o_osd); 1176 while (*p) { 1177 parent = *p; 1178 osd = rb_entry(parent, struct ceph_osd, o_node); 1179 if (new->o_osd < osd->o_osd) 1180 p = &(*p)->rb_left; 1181 else if (new->o_osd > osd->o_osd) 1182 p = &(*p)->rb_right; 1183 else 1184 BUG(); 1185 } 1186 1187 rb_link_node(&new->o_node, parent, p); 1188 rb_insert_color(&new->o_node, &osdc->osds); 1189 } 1190 1191 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o) 1192 { 1193 struct ceph_osd *osd; 1194 struct rb_node *n = osdc->osds.rb_node; 1195 1196 while (n) { 1197 osd = rb_entry(n, struct ceph_osd, o_node); 1198 if (o < osd->o_osd) 1199 n = n->rb_left; 1200 else if (o > osd->o_osd) 1201 n = n->rb_right; 1202 else 1203 return osd; 1204 } 1205 return NULL; 1206 } 1207 1208 static void __schedule_osd_timeout(struct ceph_osd_client *osdc) 1209 { 1210 schedule_delayed_work(&osdc->timeout_work, 1211 osdc->client->options->osd_keepalive_timeout); 1212 } 1213 1214 static void __cancel_osd_timeout(struct ceph_osd_client *osdc) 1215 { 1216 cancel_delayed_work(&osdc->timeout_work); 1217 } 1218 1219 /* 1220 * Register request, assign tid. If this is the first request, set up 1221 * the timeout event. 1222 */ 1223 static void __register_request(struct ceph_osd_client *osdc, 1224 struct ceph_osd_request *req) 1225 { 1226 req->r_tid = ++osdc->last_tid; 1227 req->r_request->hdr.tid = cpu_to_le64(req->r_tid); 1228 dout("__register_request %p tid %lld\n", req, req->r_tid); 1229 __insert_request(osdc, req); 1230 ceph_osdc_get_request(req); 1231 osdc->num_requests++; 1232 if (osdc->num_requests == 1) { 1233 dout(" first request, scheduling timeout\n"); 1234 __schedule_osd_timeout(osdc); 1235 } 1236 } 1237 1238 /* 1239 * called under osdc->request_mutex 1240 */ 1241 static void __unregister_request(struct ceph_osd_client *osdc, 1242 struct ceph_osd_request *req) 1243 { 1244 if (RB_EMPTY_NODE(&req->r_node)) { 1245 dout("__unregister_request %p tid %lld not registered\n", 1246 req, req->r_tid); 1247 return; 1248 } 1249 1250 dout("__unregister_request %p tid %lld\n", req, req->r_tid); 1251 rb_erase(&req->r_node, &osdc->requests); 1252 RB_CLEAR_NODE(&req->r_node); 1253 osdc->num_requests--; 1254 1255 if (req->r_osd) { 1256 /* make sure the original request isn't in flight. */ 1257 ceph_msg_revoke(req->r_request); 1258 1259 list_del_init(&req->r_osd_item); 1260 maybe_move_osd_to_lru(osdc, req->r_osd); 1261 if (list_empty(&req->r_linger_osd_item)) 1262 req->r_osd = NULL; 1263 } 1264 1265 list_del_init(&req->r_req_lru_item); 1266 ceph_osdc_put_request(req); 1267 1268 if (osdc->num_requests == 0) { 1269 dout(" no requests, canceling timeout\n"); 1270 __cancel_osd_timeout(osdc); 1271 } 1272 } 1273 1274 /* 1275 * Cancel a previously queued request message 1276 */ 1277 static void __cancel_request(struct ceph_osd_request *req) 1278 { 1279 if (req->r_sent && req->r_osd) { 1280 ceph_msg_revoke(req->r_request); 1281 req->r_sent = 0; 1282 } 1283 } 1284 1285 static void __register_linger_request(struct ceph_osd_client *osdc, 1286 struct ceph_osd_request *req) 1287 { 1288 dout("%s %p tid %llu\n", __func__, req, req->r_tid); 1289 WARN_ON(!req->r_linger); 1290 1291 ceph_osdc_get_request(req); 1292 list_add_tail(&req->r_linger_item, &osdc->req_linger); 1293 if (req->r_osd) 1294 list_add_tail(&req->r_linger_osd_item, 1295 &req->r_osd->o_linger_requests); 1296 } 1297 1298 static void __unregister_linger_request(struct ceph_osd_client *osdc, 1299 struct ceph_osd_request *req) 1300 { 1301 WARN_ON(!req->r_linger); 1302 1303 if (list_empty(&req->r_linger_item)) { 1304 dout("%s %p tid %llu not registered\n", __func__, req, 1305 req->r_tid); 1306 return; 1307 } 1308 1309 dout("%s %p tid %llu\n", __func__, req, req->r_tid); 1310 list_del_init(&req->r_linger_item); 1311 1312 if (req->r_osd) { 1313 list_del_init(&req->r_linger_osd_item); 1314 maybe_move_osd_to_lru(osdc, req->r_osd); 1315 if (list_empty(&req->r_osd_item)) 1316 req->r_osd = NULL; 1317 } 1318 ceph_osdc_put_request(req); 1319 } 1320 1321 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc, 1322 struct ceph_osd_request *req) 1323 { 1324 if (!req->r_linger) { 1325 dout("set_request_linger %p\n", req); 1326 req->r_linger = 1; 1327 } 1328 } 1329 EXPORT_SYMBOL(ceph_osdc_set_request_linger); 1330 1331 /* 1332 * Returns whether a request should be blocked from being sent 1333 * based on the current osdmap and osd_client settings. 1334 * 1335 * Caller should hold map_sem for read. 1336 */ 1337 static bool __req_should_be_paused(struct ceph_osd_client *osdc, 1338 struct ceph_osd_request *req) 1339 { 1340 bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD); 1341 bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) || 1342 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL); 1343 return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) || 1344 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr); 1345 } 1346 1347 /* 1348 * Calculate mapping of a request to a PG. Takes tiering into account. 1349 */ 1350 static int __calc_request_pg(struct ceph_osdmap *osdmap, 1351 struct ceph_osd_request *req, 1352 struct ceph_pg *pg_out) 1353 { 1354 bool need_check_tiering; 1355 1356 need_check_tiering = false; 1357 if (req->r_target_oloc.pool == -1) { 1358 req->r_target_oloc = req->r_base_oloc; /* struct */ 1359 need_check_tiering = true; 1360 } 1361 if (req->r_target_oid.name_len == 0) { 1362 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid); 1363 need_check_tiering = true; 1364 } 1365 1366 if (need_check_tiering && 1367 (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) { 1368 struct ceph_pg_pool_info *pi; 1369 1370 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool); 1371 if (pi) { 1372 if ((req->r_flags & CEPH_OSD_FLAG_READ) && 1373 pi->read_tier >= 0) 1374 req->r_target_oloc.pool = pi->read_tier; 1375 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) && 1376 pi->write_tier >= 0) 1377 req->r_target_oloc.pool = pi->write_tier; 1378 } 1379 /* !pi is caught in ceph_oloc_oid_to_pg() */ 1380 } 1381 1382 return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc, 1383 &req->r_target_oid, pg_out); 1384 } 1385 1386 static void __enqueue_request(struct ceph_osd_request *req) 1387 { 1388 struct ceph_osd_client *osdc = req->r_osdc; 1389 1390 dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid, 1391 req->r_osd ? req->r_osd->o_osd : -1); 1392 1393 if (req->r_osd) { 1394 __remove_osd_from_lru(req->r_osd); 1395 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests); 1396 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent); 1397 } else { 1398 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget); 1399 } 1400 } 1401 1402 /* 1403 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct 1404 * (as needed), and set the request r_osd appropriately. If there is 1405 * no up osd, set r_osd to NULL. Move the request to the appropriate list 1406 * (unsent, homeless) or leave on in-flight lru. 1407 * 1408 * Return 0 if unchanged, 1 if changed, or negative on error. 1409 * 1410 * Caller should hold map_sem for read and request_mutex. 1411 */ 1412 static int __map_request(struct ceph_osd_client *osdc, 1413 struct ceph_osd_request *req, int force_resend) 1414 { 1415 struct ceph_pg pgid; 1416 int acting[CEPH_PG_MAX_SIZE]; 1417 int num, o; 1418 int err; 1419 bool was_paused; 1420 1421 dout("map_request %p tid %lld\n", req, req->r_tid); 1422 1423 err = __calc_request_pg(osdc->osdmap, req, &pgid); 1424 if (err) { 1425 list_move(&req->r_req_lru_item, &osdc->req_notarget); 1426 return err; 1427 } 1428 req->r_pgid = pgid; 1429 1430 num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o); 1431 if (num < 0) 1432 num = 0; 1433 1434 was_paused = req->r_paused; 1435 req->r_paused = __req_should_be_paused(osdc, req); 1436 if (was_paused && !req->r_paused) 1437 force_resend = 1; 1438 1439 if ((!force_resend && 1440 req->r_osd && req->r_osd->o_osd == o && 1441 req->r_sent >= req->r_osd->o_incarnation && 1442 req->r_num_pg_osds == num && 1443 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) || 1444 (req->r_osd == NULL && o == -1) || 1445 req->r_paused) 1446 return 0; /* no change */ 1447 1448 dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n", 1449 req->r_tid, pgid.pool, pgid.seed, o, 1450 req->r_osd ? req->r_osd->o_osd : -1); 1451 1452 /* record full pg acting set */ 1453 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num); 1454 req->r_num_pg_osds = num; 1455 1456 if (req->r_osd) { 1457 __cancel_request(req); 1458 list_del_init(&req->r_osd_item); 1459 list_del_init(&req->r_linger_osd_item); 1460 req->r_osd = NULL; 1461 } 1462 1463 req->r_osd = __lookup_osd(osdc, o); 1464 if (!req->r_osd && o >= 0) { 1465 err = -ENOMEM; 1466 req->r_osd = create_osd(osdc, o); 1467 if (!req->r_osd) { 1468 list_move(&req->r_req_lru_item, &osdc->req_notarget); 1469 goto out; 1470 } 1471 1472 dout("map_request osd %p is osd%d\n", req->r_osd, o); 1473 __insert_osd(osdc, req->r_osd); 1474 1475 ceph_con_open(&req->r_osd->o_con, 1476 CEPH_ENTITY_TYPE_OSD, o, 1477 &osdc->osdmap->osd_addr[o]); 1478 } 1479 1480 __enqueue_request(req); 1481 err = 1; /* osd or pg changed */ 1482 1483 out: 1484 return err; 1485 } 1486 1487 /* 1488 * caller should hold map_sem (for read) and request_mutex 1489 */ 1490 static void __send_request(struct ceph_osd_client *osdc, 1491 struct ceph_osd_request *req) 1492 { 1493 void *p; 1494 1495 dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n", 1496 req, req->r_tid, req->r_osd->o_osd, req->r_flags, 1497 (unsigned long long)req->r_pgid.pool, req->r_pgid.seed); 1498 1499 /* fill in message content that changes each time we send it */ 1500 put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch); 1501 put_unaligned_le32(req->r_flags, req->r_request_flags); 1502 put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool); 1503 p = req->r_request_pgid; 1504 ceph_encode_64(&p, req->r_pgid.pool); 1505 ceph_encode_32(&p, req->r_pgid.seed); 1506 put_unaligned_le64(1, req->r_request_attempts); /* FIXME */ 1507 memcpy(req->r_request_reassert_version, &req->r_reassert_version, 1508 sizeof(req->r_reassert_version)); 1509 1510 req->r_stamp = jiffies; 1511 list_move_tail(&req->r_req_lru_item, &osdc->req_lru); 1512 1513 ceph_msg_get(req->r_request); /* send consumes a ref */ 1514 1515 req->r_sent = req->r_osd->o_incarnation; 1516 1517 ceph_con_send(&req->r_osd->o_con, req->r_request); 1518 } 1519 1520 /* 1521 * Send any requests in the queue (req_unsent). 1522 */ 1523 static void __send_queued(struct ceph_osd_client *osdc) 1524 { 1525 struct ceph_osd_request *req, *tmp; 1526 1527 dout("__send_queued\n"); 1528 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) 1529 __send_request(osdc, req); 1530 } 1531 1532 /* 1533 * Caller should hold map_sem for read and request_mutex. 1534 */ 1535 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc, 1536 struct ceph_osd_request *req, 1537 bool nofail) 1538 { 1539 int rc; 1540 1541 __register_request(osdc, req); 1542 req->r_sent = 0; 1543 req->r_got_reply = 0; 1544 rc = __map_request(osdc, req, 0); 1545 if (rc < 0) { 1546 if (nofail) { 1547 dout("osdc_start_request failed map, " 1548 " will retry %lld\n", req->r_tid); 1549 rc = 0; 1550 } else { 1551 __unregister_request(osdc, req); 1552 } 1553 return rc; 1554 } 1555 1556 if (req->r_osd == NULL) { 1557 dout("send_request %p no up osds in pg\n", req); 1558 ceph_monc_request_next_osdmap(&osdc->client->monc); 1559 } else { 1560 __send_queued(osdc); 1561 } 1562 1563 return 0; 1564 } 1565 1566 /* 1567 * Timeout callback, called every N seconds when 1 or more osd 1568 * requests has been active for more than N seconds. When this 1569 * happens, we ping all OSDs with requests who have timed out to 1570 * ensure any communications channel reset is detected. Reset the 1571 * request timeouts another N seconds in the future as we go. 1572 * Reschedule the timeout event another N seconds in future (unless 1573 * there are no open requests). 1574 */ 1575 static void handle_timeout(struct work_struct *work) 1576 { 1577 struct ceph_osd_client *osdc = 1578 container_of(work, struct ceph_osd_client, timeout_work.work); 1579 struct ceph_options *opts = osdc->client->options; 1580 struct ceph_osd_request *req; 1581 struct ceph_osd *osd; 1582 struct list_head slow_osds; 1583 dout("timeout\n"); 1584 down_read(&osdc->map_sem); 1585 1586 ceph_monc_request_next_osdmap(&osdc->client->monc); 1587 1588 mutex_lock(&osdc->request_mutex); 1589 1590 /* 1591 * ping osds that are a bit slow. this ensures that if there 1592 * is a break in the TCP connection we will notice, and reopen 1593 * a connection with that osd (from the fault callback). 1594 */ 1595 INIT_LIST_HEAD(&slow_osds); 1596 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) { 1597 if (time_before(jiffies, 1598 req->r_stamp + opts->osd_keepalive_timeout)) 1599 break; 1600 1601 osd = req->r_osd; 1602 BUG_ON(!osd); 1603 dout(" tid %llu is slow, will send keepalive on osd%d\n", 1604 req->r_tid, osd->o_osd); 1605 list_move_tail(&osd->o_keepalive_item, &slow_osds); 1606 } 1607 while (!list_empty(&slow_osds)) { 1608 osd = list_entry(slow_osds.next, struct ceph_osd, 1609 o_keepalive_item); 1610 list_del_init(&osd->o_keepalive_item); 1611 ceph_con_keepalive(&osd->o_con); 1612 } 1613 1614 __schedule_osd_timeout(osdc); 1615 __send_queued(osdc); 1616 mutex_unlock(&osdc->request_mutex); 1617 up_read(&osdc->map_sem); 1618 } 1619 1620 static void handle_osds_timeout(struct work_struct *work) 1621 { 1622 struct ceph_osd_client *osdc = 1623 container_of(work, struct ceph_osd_client, 1624 osds_timeout_work.work); 1625 unsigned long delay = osdc->client->options->osd_idle_ttl / 4; 1626 1627 dout("osds timeout\n"); 1628 down_read(&osdc->map_sem); 1629 remove_old_osds(osdc); 1630 up_read(&osdc->map_sem); 1631 1632 schedule_delayed_work(&osdc->osds_timeout_work, 1633 round_jiffies_relative(delay)); 1634 } 1635 1636 static int ceph_oloc_decode(void **p, void *end, 1637 struct ceph_object_locator *oloc) 1638 { 1639 u8 struct_v, struct_cv; 1640 u32 len; 1641 void *struct_end; 1642 int ret = 0; 1643 1644 ceph_decode_need(p, end, 1 + 1 + 4, e_inval); 1645 struct_v = ceph_decode_8(p); 1646 struct_cv = ceph_decode_8(p); 1647 if (struct_v < 3) { 1648 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n", 1649 struct_v, struct_cv); 1650 goto e_inval; 1651 } 1652 if (struct_cv > 6) { 1653 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n", 1654 struct_v, struct_cv); 1655 goto e_inval; 1656 } 1657 len = ceph_decode_32(p); 1658 ceph_decode_need(p, end, len, e_inval); 1659 struct_end = *p + len; 1660 1661 oloc->pool = ceph_decode_64(p); 1662 *p += 4; /* skip preferred */ 1663 1664 len = ceph_decode_32(p); 1665 if (len > 0) { 1666 pr_warn("ceph_object_locator::key is set\n"); 1667 goto e_inval; 1668 } 1669 1670 if (struct_v >= 5) { 1671 len = ceph_decode_32(p); 1672 if (len > 0) { 1673 pr_warn("ceph_object_locator::nspace is set\n"); 1674 goto e_inval; 1675 } 1676 } 1677 1678 if (struct_v >= 6) { 1679 s64 hash = ceph_decode_64(p); 1680 if (hash != -1) { 1681 pr_warn("ceph_object_locator::hash is set\n"); 1682 goto e_inval; 1683 } 1684 } 1685 1686 /* skip the rest */ 1687 *p = struct_end; 1688 out: 1689 return ret; 1690 1691 e_inval: 1692 ret = -EINVAL; 1693 goto out; 1694 } 1695 1696 static int ceph_redirect_decode(void **p, void *end, 1697 struct ceph_request_redirect *redir) 1698 { 1699 u8 struct_v, struct_cv; 1700 u32 len; 1701 void *struct_end; 1702 int ret; 1703 1704 ceph_decode_need(p, end, 1 + 1 + 4, e_inval); 1705 struct_v = ceph_decode_8(p); 1706 struct_cv = ceph_decode_8(p); 1707 if (struct_cv > 1) { 1708 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n", 1709 struct_v, struct_cv); 1710 goto e_inval; 1711 } 1712 len = ceph_decode_32(p); 1713 ceph_decode_need(p, end, len, e_inval); 1714 struct_end = *p + len; 1715 1716 ret = ceph_oloc_decode(p, end, &redir->oloc); 1717 if (ret) 1718 goto out; 1719 1720 len = ceph_decode_32(p); 1721 if (len > 0) { 1722 pr_warn("ceph_request_redirect::object_name is set\n"); 1723 goto e_inval; 1724 } 1725 1726 len = ceph_decode_32(p); 1727 *p += len; /* skip osd_instructions */ 1728 1729 /* skip the rest */ 1730 *p = struct_end; 1731 out: 1732 return ret; 1733 1734 e_inval: 1735 ret = -EINVAL; 1736 goto out; 1737 } 1738 1739 static void complete_request(struct ceph_osd_request *req) 1740 { 1741 complete_all(&req->r_safe_completion); /* fsync waiter */ 1742 } 1743 1744 /* 1745 * handle osd op reply. either call the callback if it is specified, 1746 * or do the completion to wake up the waiting thread. 1747 */ 1748 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg, 1749 struct ceph_connection *con) 1750 { 1751 void *p, *end; 1752 struct ceph_osd_request *req; 1753 struct ceph_request_redirect redir; 1754 u64 tid; 1755 int object_len; 1756 unsigned int numops; 1757 int payload_len, flags; 1758 s32 result; 1759 s32 retry_attempt; 1760 struct ceph_pg pg; 1761 int err; 1762 u32 reassert_epoch; 1763 u64 reassert_version; 1764 u32 osdmap_epoch; 1765 int already_completed; 1766 u32 bytes; 1767 unsigned int i; 1768 1769 tid = le64_to_cpu(msg->hdr.tid); 1770 dout("handle_reply %p tid %llu\n", msg, tid); 1771 1772 p = msg->front.iov_base; 1773 end = p + msg->front.iov_len; 1774 1775 ceph_decode_need(&p, end, 4, bad); 1776 object_len = ceph_decode_32(&p); 1777 ceph_decode_need(&p, end, object_len, bad); 1778 p += object_len; 1779 1780 err = ceph_decode_pgid(&p, end, &pg); 1781 if (err) 1782 goto bad; 1783 1784 ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad); 1785 flags = ceph_decode_64(&p); 1786 result = ceph_decode_32(&p); 1787 reassert_epoch = ceph_decode_32(&p); 1788 reassert_version = ceph_decode_64(&p); 1789 osdmap_epoch = ceph_decode_32(&p); 1790 1791 /* lookup */ 1792 down_read(&osdc->map_sem); 1793 mutex_lock(&osdc->request_mutex); 1794 req = __lookup_request(osdc, tid); 1795 if (req == NULL) { 1796 dout("handle_reply tid %llu dne\n", tid); 1797 goto bad_mutex; 1798 } 1799 ceph_osdc_get_request(req); 1800 1801 dout("handle_reply %p tid %llu req %p result %d\n", msg, tid, 1802 req, result); 1803 1804 ceph_decode_need(&p, end, 4, bad_put); 1805 numops = ceph_decode_32(&p); 1806 if (numops > CEPH_OSD_MAX_OP) 1807 goto bad_put; 1808 if (numops != req->r_num_ops) 1809 goto bad_put; 1810 payload_len = 0; 1811 ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put); 1812 for (i = 0; i < numops; i++) { 1813 struct ceph_osd_op *op = p; 1814 int len; 1815 1816 len = le32_to_cpu(op->payload_len); 1817 req->r_reply_op_len[i] = len; 1818 dout(" op %d has %d bytes\n", i, len); 1819 payload_len += len; 1820 p += sizeof(*op); 1821 } 1822 bytes = le32_to_cpu(msg->hdr.data_len); 1823 if (payload_len != bytes) { 1824 pr_warn("sum of op payload lens %d != data_len %d\n", 1825 payload_len, bytes); 1826 goto bad_put; 1827 } 1828 1829 ceph_decode_need(&p, end, 4 + numops * 4, bad_put); 1830 retry_attempt = ceph_decode_32(&p); 1831 for (i = 0; i < numops; i++) 1832 req->r_reply_op_result[i] = ceph_decode_32(&p); 1833 1834 if (le16_to_cpu(msg->hdr.version) >= 6) { 1835 p += 8 + 4; /* skip replay_version */ 1836 p += 8; /* skip user_version */ 1837 1838 err = ceph_redirect_decode(&p, end, &redir); 1839 if (err) 1840 goto bad_put; 1841 } else { 1842 redir.oloc.pool = -1; 1843 } 1844 1845 if (redir.oloc.pool != -1) { 1846 dout("redirect pool %lld\n", redir.oloc.pool); 1847 1848 __unregister_request(osdc, req); 1849 1850 req->r_target_oloc = redir.oloc; /* struct */ 1851 1852 /* 1853 * Start redirect requests with nofail=true. If 1854 * mapping fails, request will end up on the notarget 1855 * list, waiting for the new osdmap (which can take 1856 * a while), even though the original request mapped 1857 * successfully. In the future we might want to follow 1858 * original request's nofail setting here. 1859 */ 1860 err = __ceph_osdc_start_request(osdc, req, true); 1861 BUG_ON(err); 1862 1863 goto out_unlock; 1864 } 1865 1866 already_completed = req->r_got_reply; 1867 if (!req->r_got_reply) { 1868 req->r_result = result; 1869 dout("handle_reply result %d bytes %d\n", req->r_result, 1870 bytes); 1871 if (req->r_result == 0) 1872 req->r_result = bytes; 1873 1874 /* in case this is a write and we need to replay, */ 1875 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch); 1876 req->r_reassert_version.version = cpu_to_le64(reassert_version); 1877 1878 req->r_got_reply = 1; 1879 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) { 1880 dout("handle_reply tid %llu dup ack\n", tid); 1881 goto out_unlock; 1882 } 1883 1884 dout("handle_reply tid %llu flags %d\n", tid, flags); 1885 1886 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK)) 1887 __register_linger_request(osdc, req); 1888 1889 /* either this is a read, or we got the safe response */ 1890 if (result < 0 || 1891 (flags & CEPH_OSD_FLAG_ONDISK) || 1892 ((flags & CEPH_OSD_FLAG_WRITE) == 0)) 1893 __unregister_request(osdc, req); 1894 1895 mutex_unlock(&osdc->request_mutex); 1896 up_read(&osdc->map_sem); 1897 1898 if (!already_completed) { 1899 if (req->r_unsafe_callback && 1900 result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK)) 1901 req->r_unsafe_callback(req, true); 1902 if (req->r_callback) 1903 req->r_callback(req, msg); 1904 else 1905 complete_all(&req->r_completion); 1906 } 1907 1908 if (flags & CEPH_OSD_FLAG_ONDISK) { 1909 if (req->r_unsafe_callback && already_completed) 1910 req->r_unsafe_callback(req, false); 1911 complete_request(req); 1912 } 1913 1914 out: 1915 dout("req=%p req->r_linger=%d\n", req, req->r_linger); 1916 ceph_osdc_put_request(req); 1917 return; 1918 out_unlock: 1919 mutex_unlock(&osdc->request_mutex); 1920 up_read(&osdc->map_sem); 1921 goto out; 1922 1923 bad_put: 1924 req->r_result = -EIO; 1925 __unregister_request(osdc, req); 1926 if (req->r_callback) 1927 req->r_callback(req, msg); 1928 else 1929 complete_all(&req->r_completion); 1930 complete_request(req); 1931 ceph_osdc_put_request(req); 1932 bad_mutex: 1933 mutex_unlock(&osdc->request_mutex); 1934 up_read(&osdc->map_sem); 1935 bad: 1936 pr_err("corrupt osd_op_reply got %d %d\n", 1937 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len)); 1938 ceph_msg_dump(msg); 1939 } 1940 1941 static void reset_changed_osds(struct ceph_osd_client *osdc) 1942 { 1943 struct rb_node *p, *n; 1944 1945 dout("%s %p\n", __func__, osdc); 1946 for (p = rb_first(&osdc->osds); p; p = n) { 1947 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node); 1948 1949 n = rb_next(p); 1950 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) || 1951 memcmp(&osd->o_con.peer_addr, 1952 ceph_osd_addr(osdc->osdmap, 1953 osd->o_osd), 1954 sizeof(struct ceph_entity_addr)) != 0) 1955 __reset_osd(osdc, osd); 1956 } 1957 } 1958 1959 /* 1960 * Requeue requests whose mapping to an OSD has changed. If requests map to 1961 * no osd, request a new map. 1962 * 1963 * Caller should hold map_sem for read. 1964 */ 1965 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend, 1966 bool force_resend_writes) 1967 { 1968 struct ceph_osd_request *req, *nreq; 1969 struct rb_node *p; 1970 int needmap = 0; 1971 int err; 1972 bool force_resend_req; 1973 1974 dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "", 1975 force_resend_writes ? " (force resend writes)" : ""); 1976 mutex_lock(&osdc->request_mutex); 1977 for (p = rb_first(&osdc->requests); p; ) { 1978 req = rb_entry(p, struct ceph_osd_request, r_node); 1979 p = rb_next(p); 1980 1981 /* 1982 * For linger requests that have not yet been 1983 * registered, move them to the linger list; they'll 1984 * be sent to the osd in the loop below. Unregister 1985 * the request before re-registering it as a linger 1986 * request to ensure the __map_request() below 1987 * will decide it needs to be sent. 1988 */ 1989 if (req->r_linger && list_empty(&req->r_linger_item)) { 1990 dout("%p tid %llu restart on osd%d\n", 1991 req, req->r_tid, 1992 req->r_osd ? req->r_osd->o_osd : -1); 1993 ceph_osdc_get_request(req); 1994 __unregister_request(osdc, req); 1995 __register_linger_request(osdc, req); 1996 ceph_osdc_put_request(req); 1997 continue; 1998 } 1999 2000 force_resend_req = force_resend || 2001 (force_resend_writes && 2002 req->r_flags & CEPH_OSD_FLAG_WRITE); 2003 err = __map_request(osdc, req, force_resend_req); 2004 if (err < 0) 2005 continue; /* error */ 2006 if (req->r_osd == NULL) { 2007 dout("%p tid %llu maps to no osd\n", req, req->r_tid); 2008 needmap++; /* request a newer map */ 2009 } else if (err > 0) { 2010 if (!req->r_linger) { 2011 dout("%p tid %llu requeued on osd%d\n", req, 2012 req->r_tid, 2013 req->r_osd ? req->r_osd->o_osd : -1); 2014 req->r_flags |= CEPH_OSD_FLAG_RETRY; 2015 } 2016 } 2017 } 2018 2019 list_for_each_entry_safe(req, nreq, &osdc->req_linger, 2020 r_linger_item) { 2021 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd); 2022 2023 err = __map_request(osdc, req, 2024 force_resend || force_resend_writes); 2025 dout("__map_request returned %d\n", err); 2026 if (err < 0) 2027 continue; /* hrm! */ 2028 if (req->r_osd == NULL || err > 0) { 2029 if (req->r_osd == NULL) { 2030 dout("lingering %p tid %llu maps to no osd\n", 2031 req, req->r_tid); 2032 /* 2033 * A homeless lingering request makes 2034 * no sense, as it's job is to keep 2035 * a particular OSD connection open. 2036 * Request a newer map and kick the 2037 * request, knowing that it won't be 2038 * resent until we actually get a map 2039 * that can tell us where to send it. 2040 */ 2041 needmap++; 2042 } 2043 2044 dout("kicking lingering %p tid %llu osd%d\n", req, 2045 req->r_tid, req->r_osd ? req->r_osd->o_osd : -1); 2046 __register_request(osdc, req); 2047 __unregister_linger_request(osdc, req); 2048 } 2049 } 2050 reset_changed_osds(osdc); 2051 mutex_unlock(&osdc->request_mutex); 2052 2053 if (needmap) { 2054 dout("%d requests for down osds, need new map\n", needmap); 2055 ceph_monc_request_next_osdmap(&osdc->client->monc); 2056 } 2057 } 2058 2059 2060 /* 2061 * Process updated osd map. 2062 * 2063 * The message contains any number of incremental and full maps, normally 2064 * indicating some sort of topology change in the cluster. Kick requests 2065 * off to different OSDs as needed. 2066 */ 2067 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg) 2068 { 2069 void *p, *end, *next; 2070 u32 nr_maps, maplen; 2071 u32 epoch; 2072 struct ceph_osdmap *newmap = NULL, *oldmap; 2073 int err; 2074 struct ceph_fsid fsid; 2075 bool was_full; 2076 2077 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0); 2078 p = msg->front.iov_base; 2079 end = p + msg->front.iov_len; 2080 2081 /* verify fsid */ 2082 ceph_decode_need(&p, end, sizeof(fsid), bad); 2083 ceph_decode_copy(&p, &fsid, sizeof(fsid)); 2084 if (ceph_check_fsid(osdc->client, &fsid) < 0) 2085 return; 2086 2087 down_write(&osdc->map_sem); 2088 2089 was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL); 2090 2091 /* incremental maps */ 2092 ceph_decode_32_safe(&p, end, nr_maps, bad); 2093 dout(" %d inc maps\n", nr_maps); 2094 while (nr_maps > 0) { 2095 ceph_decode_need(&p, end, 2*sizeof(u32), bad); 2096 epoch = ceph_decode_32(&p); 2097 maplen = ceph_decode_32(&p); 2098 ceph_decode_need(&p, end, maplen, bad); 2099 next = p + maplen; 2100 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) { 2101 dout("applying incremental map %u len %d\n", 2102 epoch, maplen); 2103 newmap = osdmap_apply_incremental(&p, next, 2104 osdc->osdmap, 2105 &osdc->client->msgr); 2106 if (IS_ERR(newmap)) { 2107 err = PTR_ERR(newmap); 2108 goto bad; 2109 } 2110 BUG_ON(!newmap); 2111 if (newmap != osdc->osdmap) { 2112 ceph_osdmap_destroy(osdc->osdmap); 2113 osdc->osdmap = newmap; 2114 } 2115 was_full = was_full || 2116 ceph_osdmap_flag(osdc->osdmap, 2117 CEPH_OSDMAP_FULL); 2118 kick_requests(osdc, 0, was_full); 2119 } else { 2120 dout("ignoring incremental map %u len %d\n", 2121 epoch, maplen); 2122 } 2123 p = next; 2124 nr_maps--; 2125 } 2126 if (newmap) 2127 goto done; 2128 2129 /* full maps */ 2130 ceph_decode_32_safe(&p, end, nr_maps, bad); 2131 dout(" %d full maps\n", nr_maps); 2132 while (nr_maps) { 2133 ceph_decode_need(&p, end, 2*sizeof(u32), bad); 2134 epoch = ceph_decode_32(&p); 2135 maplen = ceph_decode_32(&p); 2136 ceph_decode_need(&p, end, maplen, bad); 2137 if (nr_maps > 1) { 2138 dout("skipping non-latest full map %u len %d\n", 2139 epoch, maplen); 2140 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) { 2141 dout("skipping full map %u len %d, " 2142 "older than our %u\n", epoch, maplen, 2143 osdc->osdmap->epoch); 2144 } else { 2145 int skipped_map = 0; 2146 2147 dout("taking full map %u len %d\n", epoch, maplen); 2148 newmap = ceph_osdmap_decode(&p, p+maplen); 2149 if (IS_ERR(newmap)) { 2150 err = PTR_ERR(newmap); 2151 goto bad; 2152 } 2153 BUG_ON(!newmap); 2154 oldmap = osdc->osdmap; 2155 osdc->osdmap = newmap; 2156 if (oldmap) { 2157 if (oldmap->epoch + 1 < newmap->epoch) 2158 skipped_map = 1; 2159 ceph_osdmap_destroy(oldmap); 2160 } 2161 was_full = was_full || 2162 ceph_osdmap_flag(osdc->osdmap, 2163 CEPH_OSDMAP_FULL); 2164 kick_requests(osdc, skipped_map, was_full); 2165 } 2166 p += maplen; 2167 nr_maps--; 2168 } 2169 2170 if (!osdc->osdmap) 2171 goto bad; 2172 done: 2173 downgrade_write(&osdc->map_sem); 2174 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch); 2175 2176 /* 2177 * subscribe to subsequent osdmap updates if full to ensure 2178 * we find out when we are no longer full and stop returning 2179 * ENOSPC. 2180 */ 2181 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) || 2182 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) || 2183 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR)) 2184 ceph_monc_request_next_osdmap(&osdc->client->monc); 2185 2186 mutex_lock(&osdc->request_mutex); 2187 __send_queued(osdc); 2188 mutex_unlock(&osdc->request_mutex); 2189 up_read(&osdc->map_sem); 2190 wake_up_all(&osdc->client->auth_wq); 2191 return; 2192 2193 bad: 2194 pr_err("osdc handle_map corrupt msg\n"); 2195 ceph_msg_dump(msg); 2196 up_write(&osdc->map_sem); 2197 } 2198 2199 /* 2200 * watch/notify callback event infrastructure 2201 * 2202 * These callbacks are used both for watch and notify operations. 2203 */ 2204 static void __release_event(struct kref *kref) 2205 { 2206 struct ceph_osd_event *event = 2207 container_of(kref, struct ceph_osd_event, kref); 2208 2209 dout("__release_event %p\n", event); 2210 kfree(event); 2211 } 2212 2213 static void get_event(struct ceph_osd_event *event) 2214 { 2215 kref_get(&event->kref); 2216 } 2217 2218 void ceph_osdc_put_event(struct ceph_osd_event *event) 2219 { 2220 kref_put(&event->kref, __release_event); 2221 } 2222 EXPORT_SYMBOL(ceph_osdc_put_event); 2223 2224 static void __insert_event(struct ceph_osd_client *osdc, 2225 struct ceph_osd_event *new) 2226 { 2227 struct rb_node **p = &osdc->event_tree.rb_node; 2228 struct rb_node *parent = NULL; 2229 struct ceph_osd_event *event = NULL; 2230 2231 while (*p) { 2232 parent = *p; 2233 event = rb_entry(parent, struct ceph_osd_event, node); 2234 if (new->cookie < event->cookie) 2235 p = &(*p)->rb_left; 2236 else if (new->cookie > event->cookie) 2237 p = &(*p)->rb_right; 2238 else 2239 BUG(); 2240 } 2241 2242 rb_link_node(&new->node, parent, p); 2243 rb_insert_color(&new->node, &osdc->event_tree); 2244 } 2245 2246 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc, 2247 u64 cookie) 2248 { 2249 struct rb_node **p = &osdc->event_tree.rb_node; 2250 struct rb_node *parent = NULL; 2251 struct ceph_osd_event *event = NULL; 2252 2253 while (*p) { 2254 parent = *p; 2255 event = rb_entry(parent, struct ceph_osd_event, node); 2256 if (cookie < event->cookie) 2257 p = &(*p)->rb_left; 2258 else if (cookie > event->cookie) 2259 p = &(*p)->rb_right; 2260 else 2261 return event; 2262 } 2263 return NULL; 2264 } 2265 2266 static void __remove_event(struct ceph_osd_event *event) 2267 { 2268 struct ceph_osd_client *osdc = event->osdc; 2269 2270 if (!RB_EMPTY_NODE(&event->node)) { 2271 dout("__remove_event removed %p\n", event); 2272 rb_erase(&event->node, &osdc->event_tree); 2273 ceph_osdc_put_event(event); 2274 } else { 2275 dout("__remove_event didn't remove %p\n", event); 2276 } 2277 } 2278 2279 int ceph_osdc_create_event(struct ceph_osd_client *osdc, 2280 void (*event_cb)(u64, u64, u8, void *), 2281 void *data, struct ceph_osd_event **pevent) 2282 { 2283 struct ceph_osd_event *event; 2284 2285 event = kmalloc(sizeof(*event), GFP_NOIO); 2286 if (!event) 2287 return -ENOMEM; 2288 2289 dout("create_event %p\n", event); 2290 event->cb = event_cb; 2291 event->one_shot = 0; 2292 event->data = data; 2293 event->osdc = osdc; 2294 INIT_LIST_HEAD(&event->osd_node); 2295 RB_CLEAR_NODE(&event->node); 2296 kref_init(&event->kref); /* one ref for us */ 2297 kref_get(&event->kref); /* one ref for the caller */ 2298 2299 spin_lock(&osdc->event_lock); 2300 event->cookie = ++osdc->event_count; 2301 __insert_event(osdc, event); 2302 spin_unlock(&osdc->event_lock); 2303 2304 *pevent = event; 2305 return 0; 2306 } 2307 EXPORT_SYMBOL(ceph_osdc_create_event); 2308 2309 void ceph_osdc_cancel_event(struct ceph_osd_event *event) 2310 { 2311 struct ceph_osd_client *osdc = event->osdc; 2312 2313 dout("cancel_event %p\n", event); 2314 spin_lock(&osdc->event_lock); 2315 __remove_event(event); 2316 spin_unlock(&osdc->event_lock); 2317 ceph_osdc_put_event(event); /* caller's */ 2318 } 2319 EXPORT_SYMBOL(ceph_osdc_cancel_event); 2320 2321 2322 static void do_event_work(struct work_struct *work) 2323 { 2324 struct ceph_osd_event_work *event_work = 2325 container_of(work, struct ceph_osd_event_work, work); 2326 struct ceph_osd_event *event = event_work->event; 2327 u64 ver = event_work->ver; 2328 u64 notify_id = event_work->notify_id; 2329 u8 opcode = event_work->opcode; 2330 2331 dout("do_event_work completing %p\n", event); 2332 event->cb(ver, notify_id, opcode, event->data); 2333 dout("do_event_work completed %p\n", event); 2334 ceph_osdc_put_event(event); 2335 kfree(event_work); 2336 } 2337 2338 2339 /* 2340 * Process osd watch notifications 2341 */ 2342 static void handle_watch_notify(struct ceph_osd_client *osdc, 2343 struct ceph_msg *msg) 2344 { 2345 void *p, *end; 2346 u8 proto_ver; 2347 u64 cookie, ver, notify_id; 2348 u8 opcode; 2349 struct ceph_osd_event *event; 2350 struct ceph_osd_event_work *event_work; 2351 2352 p = msg->front.iov_base; 2353 end = p + msg->front.iov_len; 2354 2355 ceph_decode_8_safe(&p, end, proto_ver, bad); 2356 ceph_decode_8_safe(&p, end, opcode, bad); 2357 ceph_decode_64_safe(&p, end, cookie, bad); 2358 ceph_decode_64_safe(&p, end, ver, bad); 2359 ceph_decode_64_safe(&p, end, notify_id, bad); 2360 2361 spin_lock(&osdc->event_lock); 2362 event = __find_event(osdc, cookie); 2363 if (event) { 2364 BUG_ON(event->one_shot); 2365 get_event(event); 2366 } 2367 spin_unlock(&osdc->event_lock); 2368 dout("handle_watch_notify cookie %lld ver %lld event %p\n", 2369 cookie, ver, event); 2370 if (event) { 2371 event_work = kmalloc(sizeof(*event_work), GFP_NOIO); 2372 if (!event_work) { 2373 pr_err("couldn't allocate event_work\n"); 2374 ceph_osdc_put_event(event); 2375 return; 2376 } 2377 INIT_WORK(&event_work->work, do_event_work); 2378 event_work->event = event; 2379 event_work->ver = ver; 2380 event_work->notify_id = notify_id; 2381 event_work->opcode = opcode; 2382 2383 queue_work(osdc->notify_wq, &event_work->work); 2384 } 2385 2386 return; 2387 2388 bad: 2389 pr_err("osdc handle_watch_notify corrupt msg\n"); 2390 } 2391 2392 /* 2393 * build new request AND message 2394 * 2395 */ 2396 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off, 2397 struct ceph_snap_context *snapc, u64 snap_id, 2398 struct timespec *mtime) 2399 { 2400 struct ceph_msg *msg = req->r_request; 2401 void *p; 2402 size_t msg_size; 2403 int flags = req->r_flags; 2404 u64 data_len; 2405 unsigned int i; 2406 2407 req->r_snapid = snap_id; 2408 req->r_snapc = ceph_get_snap_context(snapc); 2409 2410 /* encode request */ 2411 msg->hdr.version = cpu_to_le16(4); 2412 2413 p = msg->front.iov_base; 2414 ceph_encode_32(&p, 1); /* client_inc is always 1 */ 2415 req->r_request_osdmap_epoch = p; 2416 p += 4; 2417 req->r_request_flags = p; 2418 p += 4; 2419 if (req->r_flags & CEPH_OSD_FLAG_WRITE) 2420 ceph_encode_timespec(p, mtime); 2421 p += sizeof(struct ceph_timespec); 2422 req->r_request_reassert_version = p; 2423 p += sizeof(struct ceph_eversion); /* will get filled in */ 2424 2425 /* oloc */ 2426 ceph_encode_8(&p, 4); 2427 ceph_encode_8(&p, 4); 2428 ceph_encode_32(&p, 8 + 4 + 4); 2429 req->r_request_pool = p; 2430 p += 8; 2431 ceph_encode_32(&p, -1); /* preferred */ 2432 ceph_encode_32(&p, 0); /* key len */ 2433 2434 ceph_encode_8(&p, 1); 2435 req->r_request_pgid = p; 2436 p += 8 + 4; 2437 ceph_encode_32(&p, -1); /* preferred */ 2438 2439 /* oid */ 2440 ceph_encode_32(&p, req->r_base_oid.name_len); 2441 memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len); 2442 dout("oid '%.*s' len %d\n", req->r_base_oid.name_len, 2443 req->r_base_oid.name, req->r_base_oid.name_len); 2444 p += req->r_base_oid.name_len; 2445 2446 /* ops--can imply data */ 2447 ceph_encode_16(&p, (u16)req->r_num_ops); 2448 data_len = 0; 2449 for (i = 0; i < req->r_num_ops; i++) { 2450 data_len += osd_req_encode_op(req, p, i); 2451 p += sizeof(struct ceph_osd_op); 2452 } 2453 2454 /* snaps */ 2455 ceph_encode_64(&p, req->r_snapid); 2456 ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0); 2457 ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0); 2458 if (req->r_snapc) { 2459 for (i = 0; i < snapc->num_snaps; i++) { 2460 ceph_encode_64(&p, req->r_snapc->snaps[i]); 2461 } 2462 } 2463 2464 req->r_request_attempts = p; 2465 p += 4; 2466 2467 /* data */ 2468 if (flags & CEPH_OSD_FLAG_WRITE) { 2469 u16 data_off; 2470 2471 /* 2472 * The header "data_off" is a hint to the receiver 2473 * allowing it to align received data into its 2474 * buffers such that there's no need to re-copy 2475 * it before writing it to disk (direct I/O). 2476 */ 2477 data_off = (u16) (off & 0xffff); 2478 req->r_request->hdr.data_off = cpu_to_le16(data_off); 2479 } 2480 req->r_request->hdr.data_len = cpu_to_le32(data_len); 2481 2482 BUG_ON(p > msg->front.iov_base + msg->front.iov_len); 2483 msg_size = p - msg->front.iov_base; 2484 msg->front.iov_len = msg_size; 2485 msg->hdr.front_len = cpu_to_le32(msg_size); 2486 2487 dout("build_request msg_size was %d\n", (int)msg_size); 2488 } 2489 EXPORT_SYMBOL(ceph_osdc_build_request); 2490 2491 /* 2492 * Register request, send initial attempt. 2493 */ 2494 int ceph_osdc_start_request(struct ceph_osd_client *osdc, 2495 struct ceph_osd_request *req, 2496 bool nofail) 2497 { 2498 int rc; 2499 2500 down_read(&osdc->map_sem); 2501 mutex_lock(&osdc->request_mutex); 2502 2503 rc = __ceph_osdc_start_request(osdc, req, nofail); 2504 2505 mutex_unlock(&osdc->request_mutex); 2506 up_read(&osdc->map_sem); 2507 2508 return rc; 2509 } 2510 EXPORT_SYMBOL(ceph_osdc_start_request); 2511 2512 /* 2513 * Unregister a registered request. The request is not completed (i.e. 2514 * no callbacks or wakeups) - higher layers are supposed to know what 2515 * they are canceling. 2516 */ 2517 void ceph_osdc_cancel_request(struct ceph_osd_request *req) 2518 { 2519 struct ceph_osd_client *osdc = req->r_osdc; 2520 2521 mutex_lock(&osdc->request_mutex); 2522 if (req->r_linger) 2523 __unregister_linger_request(osdc, req); 2524 __unregister_request(osdc, req); 2525 mutex_unlock(&osdc->request_mutex); 2526 2527 dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid); 2528 } 2529 EXPORT_SYMBOL(ceph_osdc_cancel_request); 2530 2531 /* 2532 * wait for a request to complete 2533 */ 2534 int ceph_osdc_wait_request(struct ceph_osd_client *osdc, 2535 struct ceph_osd_request *req) 2536 { 2537 int rc; 2538 2539 dout("%s %p tid %llu\n", __func__, req, req->r_tid); 2540 2541 rc = wait_for_completion_interruptible(&req->r_completion); 2542 if (rc < 0) { 2543 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid); 2544 ceph_osdc_cancel_request(req); 2545 complete_request(req); 2546 return rc; 2547 } 2548 2549 dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid, 2550 req->r_result); 2551 return req->r_result; 2552 } 2553 EXPORT_SYMBOL(ceph_osdc_wait_request); 2554 2555 /* 2556 * sync - wait for all in-flight requests to flush. avoid starvation. 2557 */ 2558 void ceph_osdc_sync(struct ceph_osd_client *osdc) 2559 { 2560 struct ceph_osd_request *req; 2561 u64 last_tid, next_tid = 0; 2562 2563 mutex_lock(&osdc->request_mutex); 2564 last_tid = osdc->last_tid; 2565 while (1) { 2566 req = __lookup_request_ge(osdc, next_tid); 2567 if (!req) 2568 break; 2569 if (req->r_tid > last_tid) 2570 break; 2571 2572 next_tid = req->r_tid + 1; 2573 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0) 2574 continue; 2575 2576 ceph_osdc_get_request(req); 2577 mutex_unlock(&osdc->request_mutex); 2578 dout("sync waiting on tid %llu (last is %llu)\n", 2579 req->r_tid, last_tid); 2580 wait_for_completion(&req->r_safe_completion); 2581 mutex_lock(&osdc->request_mutex); 2582 ceph_osdc_put_request(req); 2583 } 2584 mutex_unlock(&osdc->request_mutex); 2585 dout("sync done (thru tid %llu)\n", last_tid); 2586 } 2587 EXPORT_SYMBOL(ceph_osdc_sync); 2588 2589 /* 2590 * Call all pending notify callbacks - for use after a watch is 2591 * unregistered, to make sure no more callbacks for it will be invoked 2592 */ 2593 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc) 2594 { 2595 flush_workqueue(osdc->notify_wq); 2596 } 2597 EXPORT_SYMBOL(ceph_osdc_flush_notifies); 2598 2599 2600 /* 2601 * init, shutdown 2602 */ 2603 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client) 2604 { 2605 int err; 2606 2607 dout("init\n"); 2608 osdc->client = client; 2609 osdc->osdmap = NULL; 2610 init_rwsem(&osdc->map_sem); 2611 init_completion(&osdc->map_waiters); 2612 osdc->last_requested_map = 0; 2613 mutex_init(&osdc->request_mutex); 2614 osdc->last_tid = 0; 2615 osdc->osds = RB_ROOT; 2616 INIT_LIST_HEAD(&osdc->osd_lru); 2617 osdc->requests = RB_ROOT; 2618 INIT_LIST_HEAD(&osdc->req_lru); 2619 INIT_LIST_HEAD(&osdc->req_unsent); 2620 INIT_LIST_HEAD(&osdc->req_notarget); 2621 INIT_LIST_HEAD(&osdc->req_linger); 2622 osdc->num_requests = 0; 2623 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout); 2624 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout); 2625 spin_lock_init(&osdc->event_lock); 2626 osdc->event_tree = RB_ROOT; 2627 osdc->event_count = 0; 2628 2629 schedule_delayed_work(&osdc->osds_timeout_work, 2630 round_jiffies_relative(osdc->client->options->osd_idle_ttl)); 2631 2632 err = -ENOMEM; 2633 osdc->req_mempool = mempool_create_kmalloc_pool(10, 2634 sizeof(struct ceph_osd_request)); 2635 if (!osdc->req_mempool) 2636 goto out; 2637 2638 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP, 2639 OSD_OP_FRONT_LEN, 10, true, 2640 "osd_op"); 2641 if (err < 0) 2642 goto out_mempool; 2643 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY, 2644 OSD_OPREPLY_FRONT_LEN, 10, true, 2645 "osd_op_reply"); 2646 if (err < 0) 2647 goto out_msgpool; 2648 2649 err = -ENOMEM; 2650 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify"); 2651 if (!osdc->notify_wq) 2652 goto out_msgpool_reply; 2653 2654 return 0; 2655 2656 out_msgpool_reply: 2657 ceph_msgpool_destroy(&osdc->msgpool_op_reply); 2658 out_msgpool: 2659 ceph_msgpool_destroy(&osdc->msgpool_op); 2660 out_mempool: 2661 mempool_destroy(osdc->req_mempool); 2662 out: 2663 return err; 2664 } 2665 2666 void ceph_osdc_stop(struct ceph_osd_client *osdc) 2667 { 2668 flush_workqueue(osdc->notify_wq); 2669 destroy_workqueue(osdc->notify_wq); 2670 cancel_delayed_work_sync(&osdc->timeout_work); 2671 cancel_delayed_work_sync(&osdc->osds_timeout_work); 2672 if (osdc->osdmap) { 2673 ceph_osdmap_destroy(osdc->osdmap); 2674 osdc->osdmap = NULL; 2675 } 2676 remove_all_osds(osdc); 2677 mempool_destroy(osdc->req_mempool); 2678 ceph_msgpool_destroy(&osdc->msgpool_op); 2679 ceph_msgpool_destroy(&osdc->msgpool_op_reply); 2680 } 2681 2682 /* 2683 * Read some contiguous pages. If we cross a stripe boundary, shorten 2684 * *plen. Return number of bytes read, or error. 2685 */ 2686 int ceph_osdc_readpages(struct ceph_osd_client *osdc, 2687 struct ceph_vino vino, struct ceph_file_layout *layout, 2688 u64 off, u64 *plen, 2689 u32 truncate_seq, u64 truncate_size, 2690 struct page **pages, int num_pages, int page_align) 2691 { 2692 struct ceph_osd_request *req; 2693 int rc = 0; 2694 2695 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino, 2696 vino.snap, off, *plen); 2697 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1, 2698 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, 2699 NULL, truncate_seq, truncate_size, 2700 false); 2701 if (IS_ERR(req)) 2702 return PTR_ERR(req); 2703 2704 /* it may be a short read due to an object boundary */ 2705 2706 osd_req_op_extent_osd_data_pages(req, 0, 2707 pages, *plen, page_align, false, false); 2708 2709 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n", 2710 off, *plen, *plen, page_align); 2711 2712 ceph_osdc_build_request(req, off, NULL, vino.snap, NULL); 2713 2714 rc = ceph_osdc_start_request(osdc, req, false); 2715 if (!rc) 2716 rc = ceph_osdc_wait_request(osdc, req); 2717 2718 ceph_osdc_put_request(req); 2719 dout("readpages result %d\n", rc); 2720 return rc; 2721 } 2722 EXPORT_SYMBOL(ceph_osdc_readpages); 2723 2724 /* 2725 * do a synchronous write on N pages 2726 */ 2727 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino, 2728 struct ceph_file_layout *layout, 2729 struct ceph_snap_context *snapc, 2730 u64 off, u64 len, 2731 u32 truncate_seq, u64 truncate_size, 2732 struct timespec *mtime, 2733 struct page **pages, int num_pages) 2734 { 2735 struct ceph_osd_request *req; 2736 int rc = 0; 2737 int page_align = off & ~PAGE_MASK; 2738 2739 BUG_ON(vino.snap != CEPH_NOSNAP); /* snapshots aren't writeable */ 2740 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1, 2741 CEPH_OSD_OP_WRITE, 2742 CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, 2743 snapc, truncate_seq, truncate_size, 2744 true); 2745 if (IS_ERR(req)) 2746 return PTR_ERR(req); 2747 2748 /* it may be a short write due to an object boundary */ 2749 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align, 2750 false, false); 2751 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len); 2752 2753 ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime); 2754 2755 rc = ceph_osdc_start_request(osdc, req, true); 2756 if (!rc) 2757 rc = ceph_osdc_wait_request(osdc, req); 2758 2759 ceph_osdc_put_request(req); 2760 if (rc == 0) 2761 rc = len; 2762 dout("writepages result %d\n", rc); 2763 return rc; 2764 } 2765 EXPORT_SYMBOL(ceph_osdc_writepages); 2766 2767 int ceph_osdc_setup(void) 2768 { 2769 BUG_ON(ceph_osd_request_cache); 2770 ceph_osd_request_cache = kmem_cache_create("ceph_osd_request", 2771 sizeof (struct ceph_osd_request), 2772 __alignof__(struct ceph_osd_request), 2773 0, NULL); 2774 2775 return ceph_osd_request_cache ? 0 : -ENOMEM; 2776 } 2777 EXPORT_SYMBOL(ceph_osdc_setup); 2778 2779 void ceph_osdc_cleanup(void) 2780 { 2781 BUG_ON(!ceph_osd_request_cache); 2782 kmem_cache_destroy(ceph_osd_request_cache); 2783 ceph_osd_request_cache = NULL; 2784 } 2785 EXPORT_SYMBOL(ceph_osdc_cleanup); 2786 2787 /* 2788 * handle incoming message 2789 */ 2790 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) 2791 { 2792 struct ceph_osd *osd = con->private; 2793 struct ceph_osd_client *osdc; 2794 int type = le16_to_cpu(msg->hdr.type); 2795 2796 if (!osd) 2797 goto out; 2798 osdc = osd->o_osdc; 2799 2800 switch (type) { 2801 case CEPH_MSG_OSD_MAP: 2802 ceph_osdc_handle_map(osdc, msg); 2803 break; 2804 case CEPH_MSG_OSD_OPREPLY: 2805 handle_reply(osdc, msg, con); 2806 break; 2807 case CEPH_MSG_WATCH_NOTIFY: 2808 handle_watch_notify(osdc, msg); 2809 break; 2810 2811 default: 2812 pr_err("received unknown message type %d %s\n", type, 2813 ceph_msg_type_name(type)); 2814 } 2815 out: 2816 ceph_msg_put(msg); 2817 } 2818 2819 /* 2820 * Lookup and return message for incoming reply. Don't try to do 2821 * anything about a larger than preallocated data portion of the 2822 * message at the moment - for now, just skip the message. 2823 */ 2824 static struct ceph_msg *get_reply(struct ceph_connection *con, 2825 struct ceph_msg_header *hdr, 2826 int *skip) 2827 { 2828 struct ceph_osd *osd = con->private; 2829 struct ceph_osd_client *osdc = osd->o_osdc; 2830 struct ceph_msg *m; 2831 struct ceph_osd_request *req; 2832 int front_len = le32_to_cpu(hdr->front_len); 2833 int data_len = le32_to_cpu(hdr->data_len); 2834 u64 tid; 2835 2836 tid = le64_to_cpu(hdr->tid); 2837 mutex_lock(&osdc->request_mutex); 2838 req = __lookup_request(osdc, tid); 2839 if (!req) { 2840 pr_warn("%s osd%d tid %llu unknown, skipping\n", 2841 __func__, osd->o_osd, tid); 2842 m = NULL; 2843 *skip = 1; 2844 goto out; 2845 } 2846 2847 if (req->r_reply->con) 2848 dout("%s revoking msg %p from old con %p\n", __func__, 2849 req->r_reply, req->r_reply->con); 2850 ceph_msg_revoke_incoming(req->r_reply); 2851 2852 if (front_len > req->r_reply->front_alloc_len) { 2853 pr_warn("%s osd%d tid %llu front %d > preallocated %d\n", 2854 __func__, osd->o_osd, req->r_tid, front_len, 2855 req->r_reply->front_alloc_len); 2856 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS, 2857 false); 2858 if (!m) 2859 goto out; 2860 ceph_msg_put(req->r_reply); 2861 req->r_reply = m; 2862 } 2863 2864 if (data_len > req->r_reply->data_length) { 2865 pr_warn("%s osd%d tid %llu data %d > preallocated %zu, skipping\n", 2866 __func__, osd->o_osd, req->r_tid, data_len, 2867 req->r_reply->data_length); 2868 m = NULL; 2869 *skip = 1; 2870 goto out; 2871 } 2872 2873 m = ceph_msg_get(req->r_reply); 2874 dout("get_reply tid %lld %p\n", tid, m); 2875 2876 out: 2877 mutex_unlock(&osdc->request_mutex); 2878 return m; 2879 } 2880 2881 static struct ceph_msg *alloc_msg(struct ceph_connection *con, 2882 struct ceph_msg_header *hdr, 2883 int *skip) 2884 { 2885 struct ceph_osd *osd = con->private; 2886 int type = le16_to_cpu(hdr->type); 2887 int front = le32_to_cpu(hdr->front_len); 2888 2889 *skip = 0; 2890 switch (type) { 2891 case CEPH_MSG_OSD_MAP: 2892 case CEPH_MSG_WATCH_NOTIFY: 2893 return ceph_msg_new(type, front, GFP_NOFS, false); 2894 case CEPH_MSG_OSD_OPREPLY: 2895 return get_reply(con, hdr, skip); 2896 default: 2897 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type, 2898 osd->o_osd); 2899 *skip = 1; 2900 return NULL; 2901 } 2902 } 2903 2904 /* 2905 * Wrappers to refcount containing ceph_osd struct 2906 */ 2907 static struct ceph_connection *get_osd_con(struct ceph_connection *con) 2908 { 2909 struct ceph_osd *osd = con->private; 2910 if (get_osd(osd)) 2911 return con; 2912 return NULL; 2913 } 2914 2915 static void put_osd_con(struct ceph_connection *con) 2916 { 2917 struct ceph_osd *osd = con->private; 2918 put_osd(osd); 2919 } 2920 2921 /* 2922 * authentication 2923 */ 2924 /* 2925 * Note: returned pointer is the address of a structure that's 2926 * managed separately. Caller must *not* attempt to free it. 2927 */ 2928 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, 2929 int *proto, int force_new) 2930 { 2931 struct ceph_osd *o = con->private; 2932 struct ceph_osd_client *osdc = o->o_osdc; 2933 struct ceph_auth_client *ac = osdc->client->monc.auth; 2934 struct ceph_auth_handshake *auth = &o->o_auth; 2935 2936 if (force_new && auth->authorizer) { 2937 ceph_auth_destroy_authorizer(ac, auth->authorizer); 2938 auth->authorizer = NULL; 2939 } 2940 if (!auth->authorizer) { 2941 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD, 2942 auth); 2943 if (ret) 2944 return ERR_PTR(ret); 2945 } else { 2946 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD, 2947 auth); 2948 if (ret) 2949 return ERR_PTR(ret); 2950 } 2951 *proto = ac->protocol; 2952 2953 return auth; 2954 } 2955 2956 2957 static int verify_authorizer_reply(struct ceph_connection *con, int len) 2958 { 2959 struct ceph_osd *o = con->private; 2960 struct ceph_osd_client *osdc = o->o_osdc; 2961 struct ceph_auth_client *ac = osdc->client->monc.auth; 2962 2963 return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len); 2964 } 2965 2966 static int invalidate_authorizer(struct ceph_connection *con) 2967 { 2968 struct ceph_osd *o = con->private; 2969 struct ceph_osd_client *osdc = o->o_osdc; 2970 struct ceph_auth_client *ac = osdc->client->monc.auth; 2971 2972 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD); 2973 return ceph_monc_validate_auth(&osdc->client->monc); 2974 } 2975 2976 static int sign_message(struct ceph_connection *con, struct ceph_msg *msg) 2977 { 2978 struct ceph_osd *o = con->private; 2979 struct ceph_auth_handshake *auth = &o->o_auth; 2980 return ceph_auth_sign_message(auth, msg); 2981 } 2982 2983 static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg) 2984 { 2985 struct ceph_osd *o = con->private; 2986 struct ceph_auth_handshake *auth = &o->o_auth; 2987 return ceph_auth_check_message_signature(auth, msg); 2988 } 2989 2990 static const struct ceph_connection_operations osd_con_ops = { 2991 .get = get_osd_con, 2992 .put = put_osd_con, 2993 .dispatch = dispatch, 2994 .get_authorizer = get_authorizer, 2995 .verify_authorizer_reply = verify_authorizer_reply, 2996 .invalidate_authorizer = invalidate_authorizer, 2997 .alloc_msg = alloc_msg, 2998 .sign_message = sign_message, 2999 .check_message_signature = check_message_signature, 3000 .fault = osd_reset, 3001 }; 3002