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 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         default:
 300                 break;
 301         }
 302 }
 303
 304 /*
 305  * requests
 306  */
 307 static void ceph_osdc_release_request(struct kref *kref)
 308 {
 309         struct ceph_osd_request *req = container_of(kref,
 310                                             struct ceph_osd_request, r_kref);
 311         unsigned int which;
 312
 313         dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
 314              req->r_request, req->r_reply);
 315         WARN_ON(!RB_EMPTY_NODE(&req->r_node));
 316         WARN_ON(!list_empty(&req->r_req_lru_item));
 317         WARN_ON(!list_empty(&req->r_osd_item));
 318         WARN_ON(!list_empty(&req->r_linger_item));
 319         WARN_ON(!list_empty(&req->r_linger_osd_item));
 320         WARN_ON(req->r_osd);
 321
 322         if (req->r_request)
 323                 ceph_msg_put(req->r_request);
 324         if (req->r_reply) {
 325                 ceph_msg_revoke_incoming(req->r_reply);
 326                 ceph_msg_put(req->r_reply);
 327         }
 328
 329         for (which = 0; which < req->r_num_ops; which++)
 330                 osd_req_op_data_release(req, which);
 331
 332         ceph_put_snap_context(req->r_snapc);
 333         if (req->r_mempool)
 334                 mempool_free(req, req->r_osdc->req_mempool);
 335         else
 336                 kmem_cache_free(ceph_osd_request_cache, req);
 337
 338 }
 339
 340 void ceph_osdc_get_request(struct ceph_osd_request *req)
 341 {
 342         dout("%s %p (was %d)\n", __func__, req,
 343              atomic_read(&req->r_kref.refcount));
 344         kref_get(&req->r_kref);
 345 }
 346 EXPORT_SYMBOL(ceph_osdc_get_request);
 347
 348 void ceph_osdc_put_request(struct ceph_osd_request *req)
 349 {
 350         dout("%s %p (was %d)\n", __func__, req,
 351              atomic_read(&req->r_kref.refcount));
 352         kref_put(&req->r_kref, ceph_osdc_release_request);
 353 }
 354 EXPORT_SYMBOL(ceph_osdc_put_request);
 355
 356 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 357                                                struct ceph_snap_context *snapc,
 358                                                unsigned int num_ops,
 359                                                bool use_mempool,
 360                                                gfp_t gfp_flags)
 361 {
 362         struct ceph_osd_request *req;
 363         struct ceph_msg *msg;
 364         size_t msg_size;
 365
 366         BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
 367         BUG_ON(num_ops > CEPH_OSD_MAX_OP);
 368
 369         msg_size = 4 + 4 + 8 + 8 + 4+8;
 370         msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
 371         msg_size += 1 + 8 + 4 + 4;     /* pg_t */
 372         msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
 373         msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
 374         msg_size += 8;  /* snapid */
 375         msg_size += 8;  /* snap_seq */
 376         msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
 377         msg_size += 4;
 378
 379         if (use_mempool) {
 380                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 381                 memset(req, 0, sizeof(*req));
 382         } else {
 383                 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
 384         }
 385         if (req == NULL)
 386                 return NULL;
 387
 388         req->r_osdc = osdc;
 389         req->r_mempool = use_mempool;
 390         req->r_num_ops = num_ops;
 391
 392         kref_init(&req->r_kref);
 393         init_completion(&req->r_completion);
 394         init_completion(&req->r_safe_completion);
 395         RB_CLEAR_NODE(&req->r_node);
 396         INIT_LIST_HEAD(&req->r_unsafe_item);
 397         INIT_LIST_HEAD(&req->r_linger_item);
 398         INIT_LIST_HEAD(&req->r_linger_osd_item);
 399         INIT_LIST_HEAD(&req->r_req_lru_item);
 400         INIT_LIST_HEAD(&req->r_osd_item);
 401
 402         req->r_base_oloc.pool = -1;
 403         req->r_target_oloc.pool = -1;
 404
 405         /* create reply message */
 406         if (use_mempool)
 407                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 408         else
 409                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 410                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 411         if (!msg) {
 412                 ceph_osdc_put_request(req);
 413                 return NULL;
 414         }
 415         req->r_reply = msg;
 416
 417         /* create request message; allow space for oid */
 418         if (use_mempool)
 419                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 420         else
 421                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 422         if (!msg) {
 423                 ceph_osdc_put_request(req);
 424                 return NULL;
 425         }
 426
 427         memset(msg->front.iov_base, 0, msg->front.iov_len);
 428
 429         req->r_request = msg;
 430
 431         return req;
 432 }
 433 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 434
 435 static bool osd_req_opcode_valid(u16 opcode)
 436 {
 437         switch (opcode) {
 438 #define GENERATE_CASE(op, opcode, str)  case CEPH_OSD_OP_##op: return true;
 439 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
 440 #undef GENERATE_CASE
 441         default:
 442                 return false;
 443         }
 444 }
 445
 446 /*
 447  * This is an osd op init function for opcodes that have no data or
 448  * other information associated with them.  It also serves as a
 449  * common init routine for all the other init functions, below.
 450  */
 451 static struct ceph_osd_req_op *
 452 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
 453                                 u16 opcode)
 454 {
 455         struct ceph_osd_req_op *op;
 456
 457         BUG_ON(which >= osd_req->r_num_ops);
 458         BUG_ON(!osd_req_opcode_valid(opcode));
 459
 460         op = &osd_req->r_ops[which];
 461         memset(op, 0, sizeof (*op));
 462         op->op = opcode;
 463
 464         return op;
 465 }
 466
 467 void osd_req_op_init(struct ceph_osd_request *osd_req,
 468                                 unsigned int which, u16 opcode)
 469 {
 470         (void)_osd_req_op_init(osd_req, which, opcode);
 471 }
 472 EXPORT_SYMBOL(osd_req_op_init);
 473
 474 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 475                                 unsigned int which, u16 opcode,
 476                                 u64 offset, u64 length,
 477                                 u64 truncate_size, u32 truncate_seq)
 478 {
 479         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 480         size_t payload_len = 0;
 481
 482         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 483                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE);
 484
 485         op->extent.offset = offset;
 486         op->extent.length = length;
 487         op->extent.truncate_size = truncate_size;
 488         op->extent.truncate_seq = truncate_seq;
 489         if (opcode == CEPH_OSD_OP_WRITE)
 490                 payload_len += length;
 491
 492         op->payload_len = payload_len;
 493 }
 494 EXPORT_SYMBOL(osd_req_op_extent_init);
 495
 496 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 497                                 unsigned int which, u64 length)
 498 {
 499         struct ceph_osd_req_op *op;
 500         u64 previous;
 501
 502         BUG_ON(which >= osd_req->r_num_ops);
 503         op = &osd_req->r_ops[which];
 504         previous = op->extent.length;
 505
 506         if (length == previous)
 507                 return;         /* Nothing to do */
 508         BUG_ON(length > previous);
 509
 510         op->extent.length = length;
 511         op->payload_len -= previous - length;
 512 }
 513 EXPORT_SYMBOL(osd_req_op_extent_update);
 514
 515 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
 516                         u16 opcode, const char *class, const char *method)
 517 {
 518         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 519         struct ceph_pagelist *pagelist;
 520         size_t payload_len = 0;
 521         size_t size;
 522
 523         BUG_ON(opcode != CEPH_OSD_OP_CALL);
 524
 525         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
 526         BUG_ON(!pagelist);
 527         ceph_pagelist_init(pagelist);
 528
 529         op->cls.class_name = class;
 530         size = strlen(class);
 531         BUG_ON(size > (size_t) U8_MAX);
 532         op->cls.class_len = size;
 533         ceph_pagelist_append(pagelist, class, size);
 534         payload_len += size;
 535
 536         op->cls.method_name = method;
 537         size = strlen(method);
 538         BUG_ON(size > (size_t) U8_MAX);
 539         op->cls.method_len = size;
 540         ceph_pagelist_append(pagelist, method, size);
 541         payload_len += size;
 542
 543         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
 544
 545         op->cls.argc = 0;       /* currently unused */
 546
 547         op->payload_len = payload_len;
 548 }
 549 EXPORT_SYMBOL(osd_req_op_cls_init);
 550
 551 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
 552                           u16 opcode, const char *name, const void *value,
 553                           size_t size, u8 cmp_op, u8 cmp_mode)
 554 {
 555         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 556         struct ceph_pagelist *pagelist;
 557         size_t payload_len;
 558
 559         BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
 560
 561         pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
 562         if (!pagelist)
 563                 return -ENOMEM;
 564
 565         ceph_pagelist_init(pagelist);
 566
 567         payload_len = strlen(name);
 568         op->xattr.name_len = payload_len;
 569         ceph_pagelist_append(pagelist, name, payload_len);
 570
 571         op->xattr.value_len = size;
 572         ceph_pagelist_append(pagelist, value, size);
 573         payload_len += size;
 574
 575         op->xattr.cmp_op = cmp_op;
 576         op->xattr.cmp_mode = cmp_mode;
 577
 578         ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
 579         op->payload_len = payload_len;
 580         return 0;
 581 }
 582 EXPORT_SYMBOL(osd_req_op_xattr_init);
 583
 584 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 585                                 unsigned int which, u16 opcode,
 586                                 u64 cookie, u64 version, int flag)
 587 {
 588         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 589
 590         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
 591
 592         op->watch.cookie = cookie;
 593         op->watch.ver = version;
 594         if (opcode == CEPH_OSD_OP_WATCH && flag)
 595                 op->watch.flag = (u8)1;
 596 }
 597 EXPORT_SYMBOL(osd_req_op_watch_init);
 598
 599 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
 600                                 unsigned int which,
 601                                 u64 expected_object_size,
 602                                 u64 expected_write_size)
 603 {
 604         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 605                                                       CEPH_OSD_OP_SETALLOCHINT);
 606
 607         op->alloc_hint.expected_object_size = expected_object_size;
 608         op->alloc_hint.expected_write_size = expected_write_size;
 609
 610         /*
 611          * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
 612          * not worth a feature bit.  Set FAILOK per-op flag to make
 613          * sure older osds don't trip over an unsupported opcode.
 614          */
 615         op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
 616 }
 617 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
 618
 619 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 620                                 struct ceph_osd_data *osd_data)
 621 {
 622         u64 length = ceph_osd_data_length(osd_data);
 623
 624         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 625                 BUG_ON(length > (u64) SIZE_MAX);
 626                 if (length)
 627                         ceph_msg_data_add_pages(msg, osd_data->pages,
 628                                         length, osd_data->alignment);
 629         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
 630                 BUG_ON(!length);
 631                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
 632 #ifdef CONFIG_BLOCK
 633         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
 634                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
 635 #endif
 636         } else {
 637                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
 638         }
 639 }
 640
 641 static u64 osd_req_encode_op(struct ceph_osd_request *req,
 642                               struct ceph_osd_op *dst, unsigned int which)
 643 {
 644         struct ceph_osd_req_op *src;
 645         struct ceph_osd_data *osd_data;
 646         u64 request_data_len = 0;
 647         u64 data_length;
 648
 649         BUG_ON(which >= req->r_num_ops);
 650         src = &req->r_ops[which];
 651         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
 652                 pr_err("unrecognized osd opcode %d\n", src->op);
 653
 654                 return 0;
 655         }
 656
 657         switch (src->op) {
 658         case CEPH_OSD_OP_STAT:
 659                 osd_data = &src->raw_data_in;
 660                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 661                 break;
 662         case CEPH_OSD_OP_READ:
 663         case CEPH_OSD_OP_WRITE:
 664         case CEPH_OSD_OP_ZERO:
 665         case CEPH_OSD_OP_TRUNCATE:
 666                 if (src->op == CEPH_OSD_OP_WRITE)
 667                         request_data_len = src->extent.length;
 668                 dst->extent.offset = cpu_to_le64(src->extent.offset);
 669                 dst->extent.length = cpu_to_le64(src->extent.length);
 670                 dst->extent.truncate_size =
 671                         cpu_to_le64(src->extent.truncate_size);
 672                 dst->extent.truncate_seq =
 673                         cpu_to_le32(src->extent.truncate_seq);
 674                 osd_data = &src->extent.osd_data;
 675                 if (src->op == CEPH_OSD_OP_WRITE)
 676                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 677                 else
 678                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
 679                 break;
 680         case CEPH_OSD_OP_CALL:
 681                 dst->cls.class_len = src->cls.class_len;
 682                 dst->cls.method_len = src->cls.method_len;
 683                 osd_data = &src->cls.request_info;
 684                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 685                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
 686                 request_data_len = osd_data->pagelist->length;
 687
 688                 osd_data = &src->cls.request_data;
 689                 data_length = ceph_osd_data_length(osd_data);
 690                 if (data_length) {
 691                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
 692                         dst->cls.indata_len = cpu_to_le32(data_length);
 693                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 694                         src->payload_len += data_length;
 695                         request_data_len += data_length;
 696                 }
 697                 osd_data = &src->cls.response_data;
 698                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 699                 break;
 700         case CEPH_OSD_OP_STARTSYNC:
 701                 break;
 702         case CEPH_OSD_OP_NOTIFY_ACK:
 703         case CEPH_OSD_OP_WATCH:
 704                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 705                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 706                 dst->watch.flag = src->watch.flag;
 707                 break;
 708         case CEPH_OSD_OP_SETALLOCHINT:
 709                 dst->alloc_hint.expected_object_size =
 710                     cpu_to_le64(src->alloc_hint.expected_object_size);
 711                 dst->alloc_hint.expected_write_size =
 712                     cpu_to_le64(src->alloc_hint.expected_write_size);
 713                 break;
 714         case CEPH_OSD_OP_SETXATTR:
 715         case CEPH_OSD_OP_CMPXATTR:
 716                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 717                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 718                 dst->xattr.cmp_op = src->xattr.cmp_op;
 719                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
 720                 osd_data = &src->xattr.osd_data;
 721                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 722                 request_data_len = osd_data->pagelist->length;
 723                 break;
 724         case CEPH_OSD_OP_CREATE:
 725         case CEPH_OSD_OP_DELETE:
 726                 break;
 727         default:
 728                 pr_err("unsupported osd opcode %s\n",
 729                         ceph_osd_op_name(src->op));
 730                 WARN_ON(1);
 731
 732                 return 0;
 733         }
 734
 735         dst->op = cpu_to_le16(src->op);
 736         dst->flags = cpu_to_le32(src->flags);
 737         dst->payload_len = cpu_to_le32(src->payload_len);
 738
 739         return request_data_len;
 740 }
 741
 742 /*
 743  * build new request AND message, calculate layout, and adjust file
 744  * extent as needed.
 745  *
 746  * if the file was recently truncated, we include information about its
 747  * old and new size so that the object can be updated appropriately.  (we
 748  * avoid synchronously deleting truncated objects because it's slow.)
 749  *
 750  * if @do_sync, include a 'startsync' command so that the osd will flush
 751  * data quickly.
 752  */
 753 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 754                                                struct ceph_file_layout *layout,
 755                                                struct ceph_vino vino,
 756                                                u64 off, u64 *plen,
 757                                                unsigned int which, int num_ops,
 758                                                int opcode, int flags,
 759                                                struct ceph_snap_context *snapc,
 760                                                u32 truncate_seq,
 761                                                u64 truncate_size,
 762                                                bool use_mempool)
 763 {
 764         struct ceph_osd_request *req;
 765         u64 objnum = 0;
 766         u64 objoff = 0;
 767         u64 objlen = 0;
 768         int r;
 769
 770         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 771                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
 772                opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
 773
 774         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
 775                                         GFP_NOFS);
 776         if (!req)
 777                 return ERR_PTR(-ENOMEM);
 778
 779         req->r_flags = flags;
 780
 781         /* calculate max write size */
 782         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
 783         if (r < 0) {
 784                 ceph_osdc_put_request(req);
 785                 return ERR_PTR(r);
 786         }
 787
 788         if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
 789                 osd_req_op_init(req, which, opcode);
 790         } else {
 791                 u32 object_size = le32_to_cpu(layout->fl_object_size);
 792                 u32 object_base = off - objoff;
 793                 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
 794                         if (truncate_size <= object_base) {
 795                                 truncate_size = 0;
 796                         } else {
 797                                 truncate_size -= object_base;
 798                                 if (truncate_size > object_size)
 799                                         truncate_size = object_size;
 800                         }
 801                 }
 802                 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
 803                                        truncate_size, truncate_seq);
 804         }
 805
 806         req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
 807
 808         snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
 809                  "%llx.%08llx", vino.ino, objnum);
 810         req->r_base_oid.name_len = strlen(req->r_base_oid.name);
 811
 812         return req;
 813 }
 814 EXPORT_SYMBOL(ceph_osdc_new_request);
 815
 816 /*
 817  * We keep osd requests in an rbtree, sorted by ->r_tid.
 818  */
 819 static void __insert_request(struct ceph_osd_client *osdc,
 820                              struct ceph_osd_request *new)
 821 {
 822         struct rb_node **p = &osdc->requests.rb_node;
 823         struct rb_node *parent = NULL;
 824         struct ceph_osd_request *req = NULL;
 825
 826         while (*p) {
 827                 parent = *p;
 828                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 829                 if (new->r_tid < req->r_tid)
 830                         p = &(*p)->rb_left;
 831                 else if (new->r_tid > req->r_tid)
 832                         p = &(*p)->rb_right;
 833                 else
 834                         BUG();
 835         }
 836
 837         rb_link_node(&new->r_node, parent, p);
 838         rb_insert_color(&new->r_node, &osdc->requests);
 839 }
 840
 841 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 842                                                  u64 tid)
 843 {
 844         struct ceph_osd_request *req;
 845         struct rb_node *n = osdc->requests.rb_node;
 846
 847         while (n) {
 848                 req = rb_entry(n, struct ceph_osd_request, r_node);
 849                 if (tid < req->r_tid)
 850                         n = n->rb_left;
 851                 else if (tid > req->r_tid)
 852                         n = n->rb_right;
 853                 else
 854                         return req;
 855         }
 856         return NULL;
 857 }
 858
 859 static struct ceph_osd_request *
 860 __lookup_request_ge(struct ceph_osd_client *osdc,
 861                     u64 tid)
 862 {
 863         struct ceph_osd_request *req;
 864         struct rb_node *n = osdc->requests.rb_node;
 865
 866         while (n) {
 867                 req = rb_entry(n, struct ceph_osd_request, r_node);
 868                 if (tid < req->r_tid) {
 869                         if (!n->rb_left)
 870                                 return req;
 871                         n = n->rb_left;
 872                 } else if (tid > req->r_tid) {
 873                         n = n->rb_right;
 874                 } else {
 875                         return req;
 876                 }
 877         }
 878         return NULL;
 879 }
 880
 881 static void __kick_linger_request(struct ceph_osd_request *req)
 882 {
 883         struct ceph_osd_client *osdc = req->r_osdc;
 884         struct ceph_osd *osd = req->r_osd;
 885
 886         /*
 887          * Linger requests need to be resent with a new tid to avoid
 888          * the dup op detection logic on the OSDs.  Achieve this with
 889          * a re-register dance instead of open-coding.
 890          */
 891         ceph_osdc_get_request(req);
 892         if (!list_empty(&req->r_linger_item))
 893                 __unregister_linger_request(osdc, req);
 894         else
 895                 __unregister_request(osdc, req);
 896         __register_request(osdc, req);
 897         ceph_osdc_put_request(req);
 898
 899         /*
 900          * Unless request has been registered as both normal and
 901          * lingering, __unregister{,_linger}_request clears r_osd.
 902          * However, here we need to preserve r_osd to make sure we
 903          * requeue on the same OSD.
 904          */
 905         WARN_ON(req->r_osd || !osd);
 906         req->r_osd = osd;
 907
 908         dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
 909         __enqueue_request(req);
 910 }
 911
 912 /*
 913  * Resubmit requests pending on the given osd.
 914  */
 915 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 916                                 struct ceph_osd *osd)
 917 {
 918         struct ceph_osd_request *req, *nreq;
 919         LIST_HEAD(resend);
 920         LIST_HEAD(resend_linger);
 921         int err;
 922
 923         dout("%s osd%d\n", __func__, osd->o_osd);
 924         err = __reset_osd(osdc, osd);
 925         if (err)
 926                 return;
 927
 928         /*
 929          * Build up a list of requests to resend by traversing the
 930          * osd's list of requests.  Requests for a given object are
 931          * sent in tid order, and that is also the order they're
 932          * kept on this list.  Therefore all requests that are in
 933          * flight will be found first, followed by all requests that
 934          * have not yet been sent.  And to resend requests while
 935          * preserving this order we will want to put any sent
 936          * requests back on the front of the osd client's unsent
 937          * list.
 938          *
 939          * So we build a separate ordered list of already-sent
 940          * requests for the affected osd and splice it onto the
 941          * front of the osd client's unsent list.  Once we've seen a
 942          * request that has not yet been sent we're done.  Those
 943          * requests are already sitting right where they belong.
 944          */
 945         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 946                 if (!req->r_sent)
 947                         break;
 948
 949                 if (!req->r_linger) {
 950                         dout("%s requeueing %p tid %llu\n", __func__, req,
 951                              req->r_tid);
 952                         list_move_tail(&req->r_req_lru_item, &resend);
 953                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 954                 } else {
 955                         list_move_tail(&req->r_req_lru_item, &resend_linger);
 956                 }
 957         }
 958         list_splice(&resend, &osdc->req_unsent);
 959
 960         /*
 961          * Both registered and not yet registered linger requests are
 962          * enqueued with a new tid on the same OSD.  We add/move them
 963          * to req_unsent/o_requests at the end to keep things in tid
 964          * order.
 965          */
 966         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 967                                  r_linger_osd_item) {
 968                 WARN_ON(!list_empty(&req->r_req_lru_item));
 969                 __kick_linger_request(req);
 970         }
 971
 972         list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
 973                 __kick_linger_request(req);
 974 }
 975
 976 /*
 977  * If the osd connection drops, we need to resubmit all requests.
 978  */
 979 static void osd_reset(struct ceph_connection *con)
 980 {
 981         struct ceph_osd *osd = con->private;
 982         struct ceph_osd_client *osdc;
 983
 984         if (!osd)
 985                 return;
 986         dout("osd_reset osd%d\n", osd->o_osd);
 987         osdc = osd->o_osdc;
 988         down_read(&osdc->map_sem);
 989         mutex_lock(&osdc->request_mutex);
 990         __kick_osd_requests(osdc, osd);
 991         __send_queued(osdc);
 992         mutex_unlock(&osdc->request_mutex);
 993         up_read(&osdc->map_sem);
 994 }
 995
 996 /*
 997  * Track open sessions with osds.
 998  */
 999 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1000 {
1001         struct ceph_osd *osd;
1002
1003         osd = kzalloc(sizeof(*osd), GFP_NOFS);
1004         if (!osd)
1005                 return NULL;
1006
1007         atomic_set(&osd->o_ref, 1);
1008         osd->o_osdc = osdc;
1009         osd->o_osd = onum;
1010         RB_CLEAR_NODE(&osd->o_node);
1011         INIT_LIST_HEAD(&osd->o_requests);
1012         INIT_LIST_HEAD(&osd->o_linger_requests);
1013         INIT_LIST_HEAD(&osd->o_osd_lru);
1014         osd->o_incarnation = 1;
1015
1016         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1017
1018         INIT_LIST_HEAD(&osd->o_keepalive_item);
1019         return osd;
1020 }
1021
1022 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1023 {
1024         if (atomic_inc_not_zero(&osd->o_ref)) {
1025                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1026                      atomic_read(&osd->o_ref));
1027                 return osd;
1028         } else {
1029                 dout("get_osd %p FAIL\n", osd);
1030                 return NULL;
1031         }
1032 }
1033
1034 static void put_osd(struct ceph_osd *osd)
1035 {
1036         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1037              atomic_read(&osd->o_ref) - 1);
1038         if (atomic_dec_and_test(&osd->o_ref)) {
1039                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
1040
1041                 if (osd->o_auth.authorizer)
1042                         ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
1043                 kfree(osd);
1044         }
1045 }
1046
1047 /*
1048  * remove an osd from our map
1049  */
1050 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1051 {
1052         dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1053         WARN_ON(!list_empty(&osd->o_requests));
1054         WARN_ON(!list_empty(&osd->o_linger_requests));
1055
1056         list_del_init(&osd->o_osd_lru);
1057         rb_erase(&osd->o_node, &osdc->osds);
1058         RB_CLEAR_NODE(&osd->o_node);
1059 }
1060
1061 static void remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1062 {
1063         dout("%s %p osd%d\n", __func__, osd, osd->o_osd);
1064
1065         if (!RB_EMPTY_NODE(&osd->o_node)) {
1066                 ceph_con_close(&osd->o_con);
1067                 __remove_osd(osdc, osd);
1068                 put_osd(osd);
1069         }
1070 }
1071
1072 static void remove_all_osds(struct ceph_osd_client *osdc)
1073 {
1074         dout("%s %p\n", __func__, osdc);
1075         mutex_lock(&osdc->request_mutex);
1076         while (!RB_EMPTY_ROOT(&osdc->osds)) {
1077                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
1078                                                 struct ceph_osd, o_node);
1079                 remove_osd(osdc, osd);
1080         }
1081         mutex_unlock(&osdc->request_mutex);
1082 }
1083
1084 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1085                               struct ceph_osd *osd)
1086 {
1087         dout("%s %p\n", __func__, osd);
1088         BUG_ON(!list_empty(&osd->o_osd_lru));
1089
1090         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1091         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1092 }
1093
1094 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1095                                   struct ceph_osd *osd)
1096 {
1097         dout("%s %p\n", __func__, osd);
1098
1099         if (list_empty(&osd->o_requests) &&
1100             list_empty(&osd->o_linger_requests))
1101                 __move_osd_to_lru(osdc, osd);
1102 }
1103
1104 static void __remove_osd_from_lru(struct ceph_osd *osd)
1105 {
1106         dout("__remove_osd_from_lru %p\n", osd);
1107         if (!list_empty(&osd->o_osd_lru))
1108                 list_del_init(&osd->o_osd_lru);
1109 }
1110
1111 static void remove_old_osds(struct ceph_osd_client *osdc)
1112 {
1113         struct ceph_osd *osd, *nosd;
1114
1115         dout("__remove_old_osds %p\n", osdc);
1116         mutex_lock(&osdc->request_mutex);
1117         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1118                 if (time_before(jiffies, osd->lru_ttl))
1119                         break;
1120                 remove_osd(osdc, osd);
1121         }
1122         mutex_unlock(&osdc->request_mutex);
1123 }
1124
1125 /*
1126  * reset osd connect
1127  */
1128 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1129 {
1130         struct ceph_entity_addr *peer_addr;
1131
1132         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1133         if (list_empty(&osd->o_requests) &&
1134             list_empty(&osd->o_linger_requests)) {
1135                 remove_osd(osdc, osd);
1136                 return -ENODEV;
1137         }
1138
1139         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1140         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1141                         !ceph_con_opened(&osd->o_con)) {
1142                 struct ceph_osd_request *req;
1143
1144                 dout("osd addr hasn't changed and connection never opened, "
1145                      "letting msgr retry\n");
1146                 /* touch each r_stamp for handle_timeout()'s benfit */
1147                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1148                         req->r_stamp = jiffies;
1149
1150                 return -EAGAIN;
1151         }
1152
1153         ceph_con_close(&osd->o_con);
1154         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1155         osd->o_incarnation++;
1156
1157         return 0;
1158 }
1159
1160 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1161 {
1162         struct rb_node **p = &osdc->osds.rb_node;
1163         struct rb_node *parent = NULL;
1164         struct ceph_osd *osd = NULL;
1165
1166         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1167         while (*p) {
1168                 parent = *p;
1169                 osd = rb_entry(parent, struct ceph_osd, o_node);
1170                 if (new->o_osd < osd->o_osd)
1171                         p = &(*p)->rb_left;
1172                 else if (new->o_osd > osd->o_osd)
1173                         p = &(*p)->rb_right;
1174                 else
1175                         BUG();
1176         }
1177
1178         rb_link_node(&new->o_node, parent, p);
1179         rb_insert_color(&new->o_node, &osdc->osds);
1180 }
1181
1182 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1183 {
1184         struct ceph_osd *osd;
1185         struct rb_node *n = osdc->osds.rb_node;
1186
1187         while (n) {
1188                 osd = rb_entry(n, struct ceph_osd, o_node);
1189                 if (o < osd->o_osd)
1190                         n = n->rb_left;
1191                 else if (o > osd->o_osd)
1192                         n = n->rb_right;
1193                 else
1194                         return osd;
1195         }
1196         return NULL;
1197 }
1198
1199 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1200 {
1201         schedule_delayed_work(&osdc->timeout_work,
1202                         osdc->client->options->osd_keepalive_timeout * HZ);
1203 }
1204
1205 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1206 {
1207         cancel_delayed_work(&osdc->timeout_work);
1208 }
1209
1210 /*
1211  * Register request, assign tid.  If this is the first request, set up
1212  * the timeout event.
1213  */
1214 static void __register_request(struct ceph_osd_client *osdc,
1215                                struct ceph_osd_request *req)
1216 {
1217         req->r_tid = ++osdc->last_tid;
1218         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1219         dout("__register_request %p tid %lld\n", req, req->r_tid);
1220         __insert_request(osdc, req);
1221         ceph_osdc_get_request(req);
1222         osdc->num_requests++;
1223         if (osdc->num_requests == 1) {
1224                 dout(" first request, scheduling timeout\n");
1225                 __schedule_osd_timeout(osdc);
1226         }
1227 }
1228
1229 /*
1230  * called under osdc->request_mutex
1231  */
1232 static void __unregister_request(struct ceph_osd_client *osdc,
1233                                  struct ceph_osd_request *req)
1234 {
1235         if (RB_EMPTY_NODE(&req->r_node)) {
1236                 dout("__unregister_request %p tid %lld not registered\n",
1237                         req, req->r_tid);
1238                 return;
1239         }
1240
1241         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1242         rb_erase(&req->r_node, &osdc->requests);
1243         RB_CLEAR_NODE(&req->r_node);
1244         osdc->num_requests--;
1245
1246         if (req->r_osd) {
1247                 /* make sure the original request isn't in flight. */
1248                 ceph_msg_revoke(req->r_request);
1249
1250                 list_del_init(&req->r_osd_item);
1251                 maybe_move_osd_to_lru(osdc, req->r_osd);
1252                 if (list_empty(&req->r_linger_osd_item))
1253                         req->r_osd = NULL;
1254         }
1255
1256         list_del_init(&req->r_req_lru_item);
1257         ceph_osdc_put_request(req);
1258
1259         if (osdc->num_requests == 0) {
1260                 dout(" no requests, canceling timeout\n");
1261                 __cancel_osd_timeout(osdc);
1262         }
1263 }
1264
1265 /*
1266  * Cancel a previously queued request message
1267  */
1268 static void __cancel_request(struct ceph_osd_request *req)
1269 {
1270         if (req->r_sent && req->r_osd) {
1271                 ceph_msg_revoke(req->r_request);
1272                 req->r_sent = 0;
1273         }
1274 }
1275
1276 static void __register_linger_request(struct ceph_osd_client *osdc,
1277                                     struct ceph_osd_request *req)
1278 {
1279         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1280         WARN_ON(!req->r_linger);
1281
1282         ceph_osdc_get_request(req);
1283         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1284         if (req->r_osd)
1285                 list_add_tail(&req->r_linger_osd_item,
1286                               &req->r_osd->o_linger_requests);
1287 }
1288
1289 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1290                                         struct ceph_osd_request *req)
1291 {
1292         WARN_ON(!req->r_linger);
1293
1294         if (list_empty(&req->r_linger_item)) {
1295                 dout("%s %p tid %llu not registered\n", __func__, req,
1296                      req->r_tid);
1297                 return;
1298         }
1299
1300         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1301         list_del_init(&req->r_linger_item);
1302
1303         if (req->r_osd) {
1304                 list_del_init(&req->r_linger_osd_item);
1305                 maybe_move_osd_to_lru(osdc, req->r_osd);
1306                 if (list_empty(&req->r_osd_item))
1307                         req->r_osd = NULL;
1308         }
1309         ceph_osdc_put_request(req);
1310 }
1311
1312 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1313                                   struct ceph_osd_request *req)
1314 {
1315         if (!req->r_linger) {
1316                 dout("set_request_linger %p\n", req);
1317                 req->r_linger = 1;
1318         }
1319 }
1320 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1321
1322 /*
1323  * Returns whether a request should be blocked from being sent
1324  * based on the current osdmap and osd_client settings.
1325  *
1326  * Caller should hold map_sem for read.
1327  */
1328 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1329                                    struct ceph_osd_request *req)
1330 {
1331         bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1332         bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1333                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1334         return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1335                 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1336 }
1337
1338 /*
1339  * Calculate mapping of a request to a PG.  Takes tiering into account.
1340  */
1341 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1342                              struct ceph_osd_request *req,
1343                              struct ceph_pg *pg_out)
1344 {
1345         bool need_check_tiering;
1346
1347         need_check_tiering = false;
1348         if (req->r_target_oloc.pool == -1) {
1349                 req->r_target_oloc = req->r_base_oloc; /* struct */
1350                 need_check_tiering = true;
1351         }
1352         if (req->r_target_oid.name_len == 0) {
1353                 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1354                 need_check_tiering = true;
1355         }
1356
1357         if (need_check_tiering &&
1358             (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1359                 struct ceph_pg_pool_info *pi;
1360
1361                 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1362                 if (pi) {
1363                         if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1364                             pi->read_tier >= 0)
1365                                 req->r_target_oloc.pool = pi->read_tier;
1366                         if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1367                             pi->write_tier >= 0)
1368                                 req->r_target_oloc.pool = pi->write_tier;
1369                 }
1370                 /* !pi is caught in ceph_oloc_oid_to_pg() */
1371         }
1372
1373         return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1374                                    &req->r_target_oid, pg_out);
1375 }
1376
1377 static void __enqueue_request(struct ceph_osd_request *req)
1378 {
1379         struct ceph_osd_client *osdc = req->r_osdc;
1380
1381         dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1382              req->r_osd ? req->r_osd->o_osd : -1);
1383
1384         if (req->r_osd) {
1385                 __remove_osd_from_lru(req->r_osd);
1386                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1387                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1388         } else {
1389                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1390         }
1391 }
1392
1393 /*
1394  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1395  * (as needed), and set the request r_osd appropriately.  If there is
1396  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1397  * (unsent, homeless) or leave on in-flight lru.
1398  *
1399  * Return 0 if unchanged, 1 if changed, or negative on error.
1400  *
1401  * Caller should hold map_sem for read and request_mutex.
1402  */
1403 static int __map_request(struct ceph_osd_client *osdc,
1404                          struct ceph_osd_request *req, int force_resend)
1405 {
1406         struct ceph_pg pgid;
1407         int acting[CEPH_PG_MAX_SIZE];
1408         int num, o;
1409         int err;
1410         bool was_paused;
1411
1412         dout("map_request %p tid %lld\n", req, req->r_tid);
1413
1414         err = __calc_request_pg(osdc->osdmap, req, &pgid);
1415         if (err) {
1416                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1417                 return err;
1418         }
1419         req->r_pgid = pgid;
1420
1421         num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1422         if (num < 0)
1423                 num = 0;
1424
1425         was_paused = req->r_paused;
1426         req->r_paused = __req_should_be_paused(osdc, req);
1427         if (was_paused && !req->r_paused)
1428                 force_resend = 1;
1429
1430         if ((!force_resend &&
1431              req->r_osd && req->r_osd->o_osd == o &&
1432              req->r_sent >= req->r_osd->o_incarnation &&
1433              req->r_num_pg_osds == num &&
1434              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1435             (req->r_osd == NULL && o == -1) ||
1436             req->r_paused)
1437                 return 0;  /* no change */
1438
1439         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1440              req->r_tid, pgid.pool, pgid.seed, o,
1441              req->r_osd ? req->r_osd->o_osd : -1);
1442
1443         /* record full pg acting set */
1444         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1445         req->r_num_pg_osds = num;
1446
1447         if (req->r_osd) {
1448                 __cancel_request(req);
1449                 list_del_init(&req->r_osd_item);
1450                 list_del_init(&req->r_linger_osd_item);
1451                 req->r_osd = NULL;
1452         }
1453
1454         req->r_osd = __lookup_osd(osdc, o);
1455         if (!req->r_osd && o >= 0) {
1456                 err = -ENOMEM;
1457                 req->r_osd = create_osd(osdc, o);
1458                 if (!req->r_osd) {
1459                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1460                         goto out;
1461                 }
1462
1463                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1464                 __insert_osd(osdc, req->r_osd);
1465
1466                 ceph_con_open(&req->r_osd->o_con,
1467                               CEPH_ENTITY_TYPE_OSD, o,
1468                               &osdc->osdmap->osd_addr[o]);
1469         }
1470
1471         __enqueue_request(req);
1472         err = 1;   /* osd or pg changed */
1473
1474 out:
1475         return err;
1476 }
1477
1478 /*
1479  * caller should hold map_sem (for read) and request_mutex
1480  */
1481 static void __send_request(struct ceph_osd_client *osdc,
1482                            struct ceph_osd_request *req)
1483 {
1484         void *p;
1485
1486         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1487              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1488              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1489
1490         /* fill in message content that changes each time we send it */
1491         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1492         put_unaligned_le32(req->r_flags, req->r_request_flags);
1493         put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1494         p = req->r_request_pgid;
1495         ceph_encode_64(&p, req->r_pgid.pool);
1496         ceph_encode_32(&p, req->r_pgid.seed);
1497         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1498         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1499                sizeof(req->r_reassert_version));
1500
1501         req->r_stamp = jiffies;
1502         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1503
1504         ceph_msg_get(req->r_request); /* send consumes a ref */
1505
1506         req->r_sent = req->r_osd->o_incarnation;
1507
1508         ceph_con_send(&req->r_osd->o_con, req->r_request);
1509 }
1510
1511 /*
1512  * Send any requests in the queue (req_unsent).
1513  */
1514 static void __send_queued(struct ceph_osd_client *osdc)
1515 {
1516         struct ceph_osd_request *req, *tmp;
1517
1518         dout("__send_queued\n");
1519         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1520                 __send_request(osdc, req);
1521 }
1522
1523 /*
1524  * Caller should hold map_sem for read and request_mutex.
1525  */
1526 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1527                                      struct ceph_osd_request *req,
1528                                      bool nofail)
1529 {
1530         int rc;
1531
1532         __register_request(osdc, req);
1533         req->r_sent = 0;
1534         req->r_got_reply = 0;
1535         rc = __map_request(osdc, req, 0);
1536         if (rc < 0) {
1537                 if (nofail) {
1538                         dout("osdc_start_request failed map, "
1539                                 " will retry %lld\n", req->r_tid);
1540                         rc = 0;
1541                 } else {
1542                         __unregister_request(osdc, req);
1543                 }
1544                 return rc;
1545         }
1546
1547         if (req->r_osd == NULL) {
1548                 dout("send_request %p no up osds in pg\n", req);
1549                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1550         } else {
1551                 __send_queued(osdc);
1552         }
1553
1554         return 0;
1555 }
1556
1557 /*
1558  * Timeout callback, called every N seconds when 1 or more osd
1559  * requests has been active for more than N seconds.  When this
1560  * happens, we ping all OSDs with requests who have timed out to
1561  * ensure any communications channel reset is detected.  Reset the
1562  * request timeouts another N seconds in the future as we go.
1563  * Reschedule the timeout event another N seconds in future (unless
1564  * there are no open requests).
1565  */
1566 static void handle_timeout(struct work_struct *work)
1567 {
1568         struct ceph_osd_client *osdc =
1569                 container_of(work, struct ceph_osd_client, timeout_work.work);
1570         struct ceph_osd_request *req;
1571         struct ceph_osd *osd;
1572         unsigned long keepalive =
1573                 osdc->client->options->osd_keepalive_timeout * HZ;
1574         struct list_head slow_osds;
1575         dout("timeout\n");
1576         down_read(&osdc->map_sem);
1577
1578         ceph_monc_request_next_osdmap(&osdc->client->monc);
1579
1580         mutex_lock(&osdc->request_mutex);
1581
1582         /*
1583          * ping osds that are a bit slow.  this ensures that if there
1584          * is a break in the TCP connection we will notice, and reopen
1585          * a connection with that osd (from the fault callback).
1586          */
1587         INIT_LIST_HEAD(&slow_osds);
1588         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1589                 if (time_before(jiffies, req->r_stamp + keepalive))
1590                         break;
1591
1592                 osd = req->r_osd;
1593                 BUG_ON(!osd);
1594                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1595                      req->r_tid, osd->o_osd);
1596                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1597         }
1598         while (!list_empty(&slow_osds)) {
1599                 osd = list_entry(slow_osds.next, struct ceph_osd,
1600                                  o_keepalive_item);
1601                 list_del_init(&osd->o_keepalive_item);
1602                 ceph_con_keepalive(&osd->o_con);
1603         }
1604
1605         __schedule_osd_timeout(osdc);
1606         __send_queued(osdc);
1607         mutex_unlock(&osdc->request_mutex);
1608         up_read(&osdc->map_sem);
1609 }
1610
1611 static void handle_osds_timeout(struct work_struct *work)
1612 {
1613         struct ceph_osd_client *osdc =
1614                 container_of(work, struct ceph_osd_client,
1615                              osds_timeout_work.work);
1616         unsigned long delay =
1617                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1618
1619         dout("osds timeout\n");
1620         down_read(&osdc->map_sem);
1621         remove_old_osds(osdc);
1622         up_read(&osdc->map_sem);
1623
1624         schedule_delayed_work(&osdc->osds_timeout_work,
1625                               round_jiffies_relative(delay));
1626 }
1627
1628 static int ceph_oloc_decode(void **p, void *end,
1629                             struct ceph_object_locator *oloc)
1630 {
1631         u8 struct_v, struct_cv;
1632         u32 len;
1633         void *struct_end;
1634         int ret = 0;
1635
1636         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1637         struct_v = ceph_decode_8(p);
1638         struct_cv = ceph_decode_8(p);
1639         if (struct_v < 3) {
1640                 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1641                         struct_v, struct_cv);
1642                 goto e_inval;
1643         }
1644         if (struct_cv > 6) {
1645                 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1646                         struct_v, struct_cv);
1647                 goto e_inval;
1648         }
1649         len = ceph_decode_32(p);
1650         ceph_decode_need(p, end, len, e_inval);
1651         struct_end = *p + len;
1652
1653         oloc->pool = ceph_decode_64(p);
1654         *p += 4; /* skip preferred */
1655
1656         len = ceph_decode_32(p);
1657         if (len > 0) {
1658                 pr_warn("ceph_object_locator::key is set\n");
1659                 goto e_inval;
1660         }
1661
1662         if (struct_v >= 5) {
1663                 len = ceph_decode_32(p);
1664                 if (len > 0) {
1665                         pr_warn("ceph_object_locator::nspace is set\n");
1666                         goto e_inval;
1667                 }
1668         }
1669
1670         if (struct_v >= 6) {
1671                 s64 hash = ceph_decode_64(p);
1672                 if (hash != -1) {
1673                         pr_warn("ceph_object_locator::hash is set\n");
1674                         goto e_inval;
1675                 }
1676         }
1677
1678         /* skip the rest */
1679         *p = struct_end;
1680 out:
1681         return ret;
1682
1683 e_inval:
1684         ret = -EINVAL;
1685         goto out;
1686 }
1687
1688 static int ceph_redirect_decode(void **p, void *end,
1689                                 struct ceph_request_redirect *redir)
1690 {
1691         u8 struct_v, struct_cv;
1692         u32 len;
1693         void *struct_end;
1694         int ret;
1695
1696         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1697         struct_v = ceph_decode_8(p);
1698         struct_cv = ceph_decode_8(p);
1699         if (struct_cv > 1) {
1700                 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1701                         struct_v, struct_cv);
1702                 goto e_inval;
1703         }
1704         len = ceph_decode_32(p);
1705         ceph_decode_need(p, end, len, e_inval);
1706         struct_end = *p + len;
1707
1708         ret = ceph_oloc_decode(p, end, &redir->oloc);
1709         if (ret)
1710                 goto out;
1711
1712         len = ceph_decode_32(p);
1713         if (len > 0) {
1714                 pr_warn("ceph_request_redirect::object_name is set\n");
1715                 goto e_inval;
1716         }
1717
1718         len = ceph_decode_32(p);
1719         *p += len; /* skip osd_instructions */
1720
1721         /* skip the rest */
1722         *p = struct_end;
1723 out:
1724         return ret;
1725
1726 e_inval:
1727         ret = -EINVAL;
1728         goto out;
1729 }
1730
1731 static void complete_request(struct ceph_osd_request *req)
1732 {
1733         complete_all(&req->r_safe_completion);  /* fsync waiter */
1734 }
1735
1736 /*
1737  * handle osd op reply.  either call the callback if it is specified,
1738  * or do the completion to wake up the waiting thread.
1739  */
1740 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1741                          struct ceph_connection *con)
1742 {
1743         void *p, *end;
1744         struct ceph_osd_request *req;
1745         struct ceph_request_redirect redir;
1746         u64 tid;
1747         int object_len;
1748         unsigned int numops;
1749         int payload_len, flags;
1750         s32 result;
1751         s32 retry_attempt;
1752         struct ceph_pg pg;
1753         int err;
1754         u32 reassert_epoch;
1755         u64 reassert_version;
1756         u32 osdmap_epoch;
1757         int already_completed;
1758         u32 bytes;
1759         unsigned int i;
1760
1761         tid = le64_to_cpu(msg->hdr.tid);
1762         dout("handle_reply %p tid %llu\n", msg, tid);
1763
1764         p = msg->front.iov_base;
1765         end = p + msg->front.iov_len;
1766
1767         ceph_decode_need(&p, end, 4, bad);
1768         object_len = ceph_decode_32(&p);
1769         ceph_decode_need(&p, end, object_len, bad);
1770         p += object_len;
1771
1772         err = ceph_decode_pgid(&p, end, &pg);
1773         if (err)
1774                 goto bad;
1775
1776         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1777         flags = ceph_decode_64(&p);
1778         result = ceph_decode_32(&p);
1779         reassert_epoch = ceph_decode_32(&p);
1780         reassert_version = ceph_decode_64(&p);
1781         osdmap_epoch = ceph_decode_32(&p);
1782
1783         /* lookup */
1784         down_read(&osdc->map_sem);
1785         mutex_lock(&osdc->request_mutex);
1786         req = __lookup_request(osdc, tid);
1787         if (req == NULL) {
1788                 dout("handle_reply tid %llu dne\n", tid);
1789                 goto bad_mutex;
1790         }
1791         ceph_osdc_get_request(req);
1792
1793         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1794              req, result);
1795
1796         ceph_decode_need(&p, end, 4, bad_put);
1797         numops = ceph_decode_32(&p);
1798         if (numops > CEPH_OSD_MAX_OP)
1799                 goto bad_put;
1800         if (numops != req->r_num_ops)
1801                 goto bad_put;
1802         payload_len = 0;
1803         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1804         for (i = 0; i < numops; i++) {
1805                 struct ceph_osd_op *op = p;
1806                 int len;
1807
1808                 len = le32_to_cpu(op->payload_len);
1809                 req->r_reply_op_len[i] = len;
1810                 dout(" op %d has %d bytes\n", i, len);
1811                 payload_len += len;
1812                 p += sizeof(*op);
1813         }
1814         bytes = le32_to_cpu(msg->hdr.data_len);
1815         if (payload_len != bytes) {
1816                 pr_warn("sum of op payload lens %d != data_len %d\n",
1817                         payload_len, bytes);
1818                 goto bad_put;
1819         }
1820
1821         ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1822         retry_attempt = ceph_decode_32(&p);
1823         for (i = 0; i < numops; i++)
1824                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1825
1826         if (le16_to_cpu(msg->hdr.version) >= 6) {
1827                 p += 8 + 4; /* skip replay_version */
1828                 p += 8; /* skip user_version */
1829
1830                 err = ceph_redirect_decode(&p, end, &redir);
1831                 if (err)
1832                         goto bad_put;
1833         } else {
1834                 redir.oloc.pool = -1;
1835         }
1836
1837         if (redir.oloc.pool != -1) {
1838                 dout("redirect pool %lld\n", redir.oloc.pool);
1839
1840                 __unregister_request(osdc, req);
1841
1842                 req->r_target_oloc = redir.oloc; /* struct */
1843
1844                 /*
1845                  * Start redirect requests with nofail=true.  If
1846                  * mapping fails, request will end up on the notarget
1847                  * list, waiting for the new osdmap (which can take
1848                  * a while), even though the original request mapped
1849                  * successfully.  In the future we might want to follow
1850                  * original request's nofail setting here.
1851                  */
1852                 err = __ceph_osdc_start_request(osdc, req, true);
1853                 BUG_ON(err);
1854
1855                 goto out_unlock;
1856         }
1857
1858         already_completed = req->r_got_reply;
1859         if (!req->r_got_reply) {
1860                 req->r_result = result;
1861                 dout("handle_reply result %d bytes %d\n", req->r_result,
1862                      bytes);
1863                 if (req->r_result == 0)
1864                         req->r_result = bytes;
1865
1866                 /* in case this is a write and we need to replay, */
1867                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1868                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1869
1870                 req->r_got_reply = 1;
1871         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1872                 dout("handle_reply tid %llu dup ack\n", tid);
1873                 goto out_unlock;
1874         }
1875
1876         dout("handle_reply tid %llu flags %d\n", tid, flags);
1877
1878         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1879                 __register_linger_request(osdc, req);
1880
1881         /* either this is a read, or we got the safe response */
1882         if (result < 0 ||
1883             (flags & CEPH_OSD_FLAG_ONDISK) ||
1884             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1885                 __unregister_request(osdc, req);
1886
1887         mutex_unlock(&osdc->request_mutex);
1888         up_read(&osdc->map_sem);
1889
1890         if (!already_completed) {
1891                 if (req->r_unsafe_callback &&
1892                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1893                         req->r_unsafe_callback(req, true);
1894                 if (req->r_callback)
1895                         req->r_callback(req, msg);
1896                 else
1897                         complete_all(&req->r_completion);
1898         }
1899
1900         if (flags & CEPH_OSD_FLAG_ONDISK) {
1901                 if (req->r_unsafe_callback && already_completed)
1902                         req->r_unsafe_callback(req, false);
1903                 complete_request(req);
1904         }
1905
1906 out:
1907         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1908         ceph_osdc_put_request(req);
1909         return;
1910 out_unlock:
1911         mutex_unlock(&osdc->request_mutex);
1912         up_read(&osdc->map_sem);
1913         goto out;
1914
1915 bad_put:
1916         req->r_result = -EIO;
1917         __unregister_request(osdc, req);
1918         if (req->r_callback)
1919                 req->r_callback(req, msg);
1920         else
1921                 complete_all(&req->r_completion);
1922         complete_request(req);
1923         ceph_osdc_put_request(req);
1924 bad_mutex:
1925         mutex_unlock(&osdc->request_mutex);
1926         up_read(&osdc->map_sem);
1927 bad:
1928         pr_err("corrupt osd_op_reply got %d %d\n",
1929                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1930         ceph_msg_dump(msg);
1931 }
1932
1933 static void reset_changed_osds(struct ceph_osd_client *osdc)
1934 {
1935         struct rb_node *p, *n;
1936
1937         dout("%s %p\n", __func__, osdc);
1938         for (p = rb_first(&osdc->osds); p; p = n) {
1939                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1940
1941                 n = rb_next(p);
1942                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1943                     memcmp(&osd->o_con.peer_addr,
1944                            ceph_osd_addr(osdc->osdmap,
1945                                          osd->o_osd),
1946                            sizeof(struct ceph_entity_addr)) != 0)
1947                         __reset_osd(osdc, osd);
1948         }
1949 }
1950
1951 /*
1952  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1953  * no osd, request a new map.
1954  *
1955  * Caller should hold map_sem for read.
1956  */
1957 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1958                           bool force_resend_writes)
1959 {
1960         struct ceph_osd_request *req, *nreq;
1961         struct rb_node *p;
1962         int needmap = 0;
1963         int err;
1964         bool force_resend_req;
1965
1966         dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1967                 force_resend_writes ? " (force resend writes)" : "");
1968         mutex_lock(&osdc->request_mutex);
1969         for (p = rb_first(&osdc->requests); p; ) {
1970                 req = rb_entry(p, struct ceph_osd_request, r_node);
1971                 p = rb_next(p);
1972
1973                 /*
1974                  * For linger requests that have not yet been
1975                  * registered, move them to the linger list; they'll
1976                  * be sent to the osd in the loop below.  Unregister
1977                  * the request before re-registering it as a linger
1978                  * request to ensure the __map_request() below
1979                  * will decide it needs to be sent.
1980                  */
1981                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1982                         dout("%p tid %llu restart on osd%d\n",
1983                              req, req->r_tid,
1984                              req->r_osd ? req->r_osd->o_osd : -1);
1985                         ceph_osdc_get_request(req);
1986                         __unregister_request(osdc, req);
1987                         __register_linger_request(osdc, req);
1988                         ceph_osdc_put_request(req);
1989                         continue;
1990                 }
1991
1992                 force_resend_req = force_resend ||
1993                         (force_resend_writes &&
1994                                 req->r_flags & CEPH_OSD_FLAG_WRITE);
1995                 err = __map_request(osdc, req, force_resend_req);
1996                 if (err < 0)
1997                         continue;  /* error */
1998                 if (req->r_osd == NULL) {
1999                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
2000                         needmap++;  /* request a newer map */
2001                 } else if (err > 0) {
2002                         if (!req->r_linger) {
2003                                 dout("%p tid %llu requeued on osd%d\n", req,
2004                                      req->r_tid,
2005                                      req->r_osd ? req->r_osd->o_osd : -1);
2006                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
2007                         }
2008                 }
2009         }
2010
2011         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2012                                  r_linger_item) {
2013                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2014
2015                 err = __map_request(osdc, req,
2016                                     force_resend || force_resend_writes);
2017                 dout("__map_request returned %d\n", err);
2018                 if (err < 0)
2019                         continue;  /* hrm! */
2020                 if (req->r_osd == NULL || err > 0) {
2021                         if (req->r_osd == NULL) {
2022                                 dout("lingering %p tid %llu maps to no osd\n",
2023                                      req, req->r_tid);
2024                                 /*
2025                                  * A homeless lingering request makes
2026                                  * no sense, as it's job is to keep
2027                                  * a particular OSD connection open.
2028                                  * Request a newer map and kick the
2029                                  * request, knowing that it won't be
2030                                  * resent until we actually get a map
2031                                  * that can tell us where to send it.
2032                                  */
2033                                 needmap++;
2034                         }
2035
2036                         dout("kicking lingering %p tid %llu osd%d\n", req,
2037                              req->r_tid, req->r_osd ? req->r_osd->o_osd : -1);
2038                         __register_request(osdc, req);
2039                         __unregister_linger_request(osdc, req);
2040                 }
2041         }
2042         reset_changed_osds(osdc);
2043         mutex_unlock(&osdc->request_mutex);
2044
2045         if (needmap) {
2046                 dout("%d requests for down osds, need new map\n", needmap);
2047                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2048         }
2049 }
2050
2051
2052 /*
2053  * Process updated osd map.
2054  *
2055  * The message contains any number of incremental and full maps, normally
2056  * indicating some sort of topology change in the cluster.  Kick requests
2057  * off to different OSDs as needed.
2058  */
2059 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2060 {
2061         void *p, *end, *next;
2062         u32 nr_maps, maplen;
2063         u32 epoch;
2064         struct ceph_osdmap *newmap = NULL, *oldmap;
2065         int err;
2066         struct ceph_fsid fsid;
2067         bool was_full;
2068
2069         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2070         p = msg->front.iov_base;
2071         end = p + msg->front.iov_len;
2072
2073         /* verify fsid */
2074         ceph_decode_need(&p, end, sizeof(fsid), bad);
2075         ceph_decode_copy(&p, &fsid, sizeof(fsid));
2076         if (ceph_check_fsid(osdc->client, &fsid) < 0)
2077                 return;
2078
2079         down_write(&osdc->map_sem);
2080
2081         was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2082
2083         /* incremental maps */
2084         ceph_decode_32_safe(&p, end, nr_maps, bad);
2085         dout(" %d inc maps\n", nr_maps);
2086         while (nr_maps > 0) {
2087                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2088                 epoch = ceph_decode_32(&p);
2089                 maplen = ceph_decode_32(&p);
2090                 ceph_decode_need(&p, end, maplen, bad);
2091                 next = p + maplen;
2092                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2093                         dout("applying incremental map %u len %d\n",
2094                              epoch, maplen);
2095                         newmap = osdmap_apply_incremental(&p, next,
2096                                                           osdc->osdmap,
2097                                                           &osdc->client->msgr);
2098                         if (IS_ERR(newmap)) {
2099                                 err = PTR_ERR(newmap);
2100                                 goto bad;
2101                         }
2102                         BUG_ON(!newmap);
2103                         if (newmap != osdc->osdmap) {
2104                                 ceph_osdmap_destroy(osdc->osdmap);
2105                                 osdc->osdmap = newmap;
2106                         }
2107                         was_full = was_full ||
2108                                 ceph_osdmap_flag(osdc->osdmap,
2109                                                  CEPH_OSDMAP_FULL);
2110                         kick_requests(osdc, 0, was_full);
2111                 } else {
2112                         dout("ignoring incremental map %u len %d\n",
2113                              epoch, maplen);
2114                 }
2115                 p = next;
2116                 nr_maps--;
2117         }
2118         if (newmap)
2119                 goto done;
2120
2121         /* full maps */
2122         ceph_decode_32_safe(&p, end, nr_maps, bad);
2123         dout(" %d full maps\n", nr_maps);
2124         while (nr_maps) {
2125                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2126                 epoch = ceph_decode_32(&p);
2127                 maplen = ceph_decode_32(&p);
2128                 ceph_decode_need(&p, end, maplen, bad);
2129                 if (nr_maps > 1) {
2130                         dout("skipping non-latest full map %u len %d\n",
2131                              epoch, maplen);
2132                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2133                         dout("skipping full map %u len %d, "
2134                              "older than our %u\n", epoch, maplen,
2135                              osdc->osdmap->epoch);
2136                 } else {
2137                         int skipped_map = 0;
2138
2139                         dout("taking full map %u len %d\n", epoch, maplen);
2140                         newmap = ceph_osdmap_decode(&p, p+maplen);
2141                         if (IS_ERR(newmap)) {
2142                                 err = PTR_ERR(newmap);
2143                                 goto bad;
2144                         }
2145                         BUG_ON(!newmap);
2146                         oldmap = osdc->osdmap;
2147                         osdc->osdmap = newmap;
2148                         if (oldmap) {
2149                                 if (oldmap->epoch + 1 < newmap->epoch)
2150                                         skipped_map = 1;
2151                                 ceph_osdmap_destroy(oldmap);
2152                         }
2153                         was_full = was_full ||
2154                                 ceph_osdmap_flag(osdc->osdmap,
2155                                                  CEPH_OSDMAP_FULL);
2156                         kick_requests(osdc, skipped_map, was_full);
2157                 }
2158                 p += maplen;
2159                 nr_maps--;
2160         }
2161
2162         if (!osdc->osdmap)
2163                 goto bad;
2164 done:
2165         downgrade_write(&osdc->map_sem);
2166         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2167
2168         /*
2169          * subscribe to subsequent osdmap updates if full to ensure
2170          * we find out when we are no longer full and stop returning
2171          * ENOSPC.
2172          */
2173         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2174                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2175                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2176                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2177
2178         mutex_lock(&osdc->request_mutex);
2179         __send_queued(osdc);
2180         mutex_unlock(&osdc->request_mutex);
2181         up_read(&osdc->map_sem);
2182         wake_up_all(&osdc->client->auth_wq);
2183         return;
2184
2185 bad:
2186         pr_err("osdc handle_map corrupt msg\n");
2187         ceph_msg_dump(msg);
2188         up_write(&osdc->map_sem);
2189 }
2190
2191 /*
2192  * watch/notify callback event infrastructure
2193  *
2194  * These callbacks are used both for watch and notify operations.
2195  */
2196 static void __release_event(struct kref *kref)
2197 {
2198         struct ceph_osd_event *event =
2199                 container_of(kref, struct ceph_osd_event, kref);
2200
2201         dout("__release_event %p\n", event);
2202         kfree(event);
2203 }
2204
2205 static void get_event(struct ceph_osd_event *event)
2206 {
2207         kref_get(&event->kref);
2208 }
2209
2210 void ceph_osdc_put_event(struct ceph_osd_event *event)
2211 {
2212         kref_put(&event->kref, __release_event);
2213 }
2214 EXPORT_SYMBOL(ceph_osdc_put_event);
2215
2216 static void __insert_event(struct ceph_osd_client *osdc,
2217                              struct ceph_osd_event *new)
2218 {
2219         struct rb_node **p = &osdc->event_tree.rb_node;
2220         struct rb_node *parent = NULL;
2221         struct ceph_osd_event *event = NULL;
2222
2223         while (*p) {
2224                 parent = *p;
2225                 event = rb_entry(parent, struct ceph_osd_event, node);
2226                 if (new->cookie < event->cookie)
2227                         p = &(*p)->rb_left;
2228                 else if (new->cookie > event->cookie)
2229                         p = &(*p)->rb_right;
2230                 else
2231                         BUG();
2232         }
2233
2234         rb_link_node(&new->node, parent, p);
2235         rb_insert_color(&new->node, &osdc->event_tree);
2236 }
2237
2238 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2239                                                 u64 cookie)
2240 {
2241         struct rb_node **p = &osdc->event_tree.rb_node;
2242         struct rb_node *parent = NULL;
2243         struct ceph_osd_event *event = NULL;
2244
2245         while (*p) {
2246                 parent = *p;
2247                 event = rb_entry(parent, struct ceph_osd_event, node);
2248                 if (cookie < event->cookie)
2249                         p = &(*p)->rb_left;
2250                 else if (cookie > event->cookie)
2251                         p = &(*p)->rb_right;
2252                 else
2253                         return event;
2254         }
2255         return NULL;
2256 }
2257
2258 static void __remove_event(struct ceph_osd_event *event)
2259 {
2260         struct ceph_osd_client *osdc = event->osdc;
2261
2262         if (!RB_EMPTY_NODE(&event->node)) {
2263                 dout("__remove_event removed %p\n", event);
2264                 rb_erase(&event->node, &osdc->event_tree);
2265                 ceph_osdc_put_event(event);
2266         } else {
2267                 dout("__remove_event didn't remove %p\n", event);
2268         }
2269 }
2270
2271 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2272                            void (*event_cb)(u64, u64, u8, void *),
2273                            void *data, struct ceph_osd_event **pevent)
2274 {
2275         struct ceph_osd_event *event;
2276
2277         event = kmalloc(sizeof(*event), GFP_NOIO);
2278         if (!event)
2279                 return -ENOMEM;
2280
2281         dout("create_event %p\n", event);
2282         event->cb = event_cb;
2283         event->one_shot = 0;
2284         event->data = data;
2285         event->osdc = osdc;
2286         INIT_LIST_HEAD(&event->osd_node);
2287         RB_CLEAR_NODE(&event->node);
2288         kref_init(&event->kref);   /* one ref for us */
2289         kref_get(&event->kref);    /* one ref for the caller */
2290
2291         spin_lock(&osdc->event_lock);
2292         event->cookie = ++osdc->event_count;
2293         __insert_event(osdc, event);
2294         spin_unlock(&osdc->event_lock);
2295
2296         *pevent = event;
2297         return 0;
2298 }
2299 EXPORT_SYMBOL(ceph_osdc_create_event);
2300
2301 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2302 {
2303         struct ceph_osd_client *osdc = event->osdc;
2304
2305         dout("cancel_event %p\n", event);
2306         spin_lock(&osdc->event_lock);
2307         __remove_event(event);
2308         spin_unlock(&osdc->event_lock);
2309         ceph_osdc_put_event(event); /* caller's */
2310 }
2311 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2312
2313
2314 static void do_event_work(struct work_struct *work)
2315 {
2316         struct ceph_osd_event_work *event_work =
2317                 container_of(work, struct ceph_osd_event_work, work);
2318         struct ceph_osd_event *event = event_work->event;
2319         u64 ver = event_work->ver;
2320         u64 notify_id = event_work->notify_id;
2321         u8 opcode = event_work->opcode;
2322
2323         dout("do_event_work completing %p\n", event);
2324         event->cb(ver, notify_id, opcode, event->data);
2325         dout("do_event_work completed %p\n", event);
2326         ceph_osdc_put_event(event);
2327         kfree(event_work);
2328 }
2329
2330
2331 /*
2332  * Process osd watch notifications
2333  */
2334 static void handle_watch_notify(struct ceph_osd_client *osdc,
2335                                 struct ceph_msg *msg)
2336 {
2337         void *p, *end;
2338         u8 proto_ver;
2339         u64 cookie, ver, notify_id;
2340         u8 opcode;
2341         struct ceph_osd_event *event;
2342         struct ceph_osd_event_work *event_work;
2343
2344         p = msg->front.iov_base;
2345         end = p + msg->front.iov_len;
2346
2347         ceph_decode_8_safe(&p, end, proto_ver, bad);
2348         ceph_decode_8_safe(&p, end, opcode, bad);
2349         ceph_decode_64_safe(&p, end, cookie, bad);
2350         ceph_decode_64_safe(&p, end, ver, bad);
2351         ceph_decode_64_safe(&p, end, notify_id, bad);
2352
2353         spin_lock(&osdc->event_lock);
2354         event = __find_event(osdc, cookie);
2355         if (event) {
2356                 BUG_ON(event->one_shot);
2357                 get_event(event);
2358         }
2359         spin_unlock(&osdc->event_lock);
2360         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2361              cookie, ver, event);
2362         if (event) {
2363                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2364                 if (!event_work) {
2365                         pr_err("couldn't allocate event_work\n");
2366                         ceph_osdc_put_event(event);
2367                         return;
2368                 }
2369                 INIT_WORK(&event_work->work, do_event_work);
2370                 event_work->event = event;
2371                 event_work->ver = ver;
2372                 event_work->notify_id = notify_id;
2373                 event_work->opcode = opcode;
2374
2375                 queue_work(osdc->notify_wq, &event_work->work);
2376         }
2377
2378         return;
2379
2380 bad:
2381         pr_err("osdc handle_watch_notify corrupt msg\n");
2382 }
2383
2384 /*
2385  * build new request AND message
2386  *
2387  */
2388 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2389                                 struct ceph_snap_context *snapc, u64 snap_id,
2390                                 struct timespec *mtime)
2391 {
2392         struct ceph_msg *msg = req->r_request;
2393         void *p;
2394         size_t msg_size;
2395         int flags = req->r_flags;
2396         u64 data_len;
2397         unsigned int i;
2398
2399         req->r_snapid = snap_id;
2400         req->r_snapc = ceph_get_snap_context(snapc);
2401
2402         /* encode request */
2403         msg->hdr.version = cpu_to_le16(4);
2404
2405         p = msg->front.iov_base;
2406         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2407         req->r_request_osdmap_epoch = p;
2408         p += 4;
2409         req->r_request_flags = p;
2410         p += 4;
2411         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2412                 ceph_encode_timespec(p, mtime);
2413         p += sizeof(struct ceph_timespec);
2414         req->r_request_reassert_version = p;
2415         p += sizeof(struct ceph_eversion); /* will get filled in */
2416
2417         /* oloc */
2418         ceph_encode_8(&p, 4);
2419         ceph_encode_8(&p, 4);
2420         ceph_encode_32(&p, 8 + 4 + 4);
2421         req->r_request_pool = p;
2422         p += 8;
2423         ceph_encode_32(&p, -1);  /* preferred */
2424         ceph_encode_32(&p, 0);   /* key len */
2425
2426         ceph_encode_8(&p, 1);
2427         req->r_request_pgid = p;
2428         p += 8 + 4;
2429         ceph_encode_32(&p, -1);  /* preferred */
2430
2431         /* oid */
2432         ceph_encode_32(&p, req->r_base_oid.name_len);
2433         memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2434         dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
2435              req->r_base_oid.name, req->r_base_oid.name_len);
2436         p += req->r_base_oid.name_len;
2437
2438         /* ops--can imply data */
2439         ceph_encode_16(&p, (u16)req->r_num_ops);
2440         data_len = 0;
2441         for (i = 0; i < req->r_num_ops; i++) {
2442                 data_len += osd_req_encode_op(req, p, i);
2443                 p += sizeof(struct ceph_osd_op);
2444         }
2445
2446         /* snaps */
2447         ceph_encode_64(&p, req->r_snapid);
2448         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2449         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2450         if (req->r_snapc) {
2451                 for (i = 0; i < snapc->num_snaps; i++) {
2452                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2453                 }
2454         }
2455
2456         req->r_request_attempts = p;
2457         p += 4;
2458
2459         /* data */
2460         if (flags & CEPH_OSD_FLAG_WRITE) {
2461                 u16 data_off;
2462
2463                 /*
2464                  * The header "data_off" is a hint to the receiver
2465                  * allowing it to align received data into its
2466                  * buffers such that there's no need to re-copy
2467                  * it before writing it to disk (direct I/O).
2468                  */
2469                 data_off = (u16) (off & 0xffff);
2470                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2471         }
2472         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2473
2474         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2475         msg_size = p - msg->front.iov_base;
2476         msg->front.iov_len = msg_size;
2477         msg->hdr.front_len = cpu_to_le32(msg_size);
2478
2479         dout("build_request msg_size was %d\n", (int)msg_size);
2480 }
2481 EXPORT_SYMBOL(ceph_osdc_build_request);
2482
2483 /*
2484  * Register request, send initial attempt.
2485  */
2486 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2487                             struct ceph_osd_request *req,
2488                             bool nofail)
2489 {
2490         int rc;
2491
2492         down_read(&osdc->map_sem);
2493         mutex_lock(&osdc->request_mutex);
2494
2495         rc = __ceph_osdc_start_request(osdc, req, nofail);
2496
2497         mutex_unlock(&osdc->request_mutex);
2498         up_read(&osdc->map_sem);
2499
2500         return rc;
2501 }
2502 EXPORT_SYMBOL(ceph_osdc_start_request);
2503
2504 /*
2505  * Unregister a registered request.  The request is not completed (i.e.
2506  * no callbacks or wakeups) - higher layers are supposed to know what
2507  * they are canceling.
2508  */
2509 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2510 {
2511         struct ceph_osd_client *osdc = req->r_osdc;
2512
2513         mutex_lock(&osdc->request_mutex);
2514         if (req->r_linger)
2515                 __unregister_linger_request(osdc, req);
2516         __unregister_request(osdc, req);
2517         mutex_unlock(&osdc->request_mutex);
2518
2519         dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2520 }
2521 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2522
2523 /*
2524  * wait for a request to complete
2525  */
2526 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2527                            struct ceph_osd_request *req)
2528 {
2529         int rc;
2530
2531         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2532
2533         rc = wait_for_completion_interruptible(&req->r_completion);
2534         if (rc < 0) {
2535                 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2536                 ceph_osdc_cancel_request(req);
2537                 complete_request(req);
2538                 return rc;
2539         }
2540
2541         dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2542              req->r_result);
2543         return req->r_result;
2544 }
2545 EXPORT_SYMBOL(ceph_osdc_wait_request);
2546
2547 /*
2548  * sync - wait for all in-flight requests to flush.  avoid starvation.
2549  */
2550 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2551 {
2552         struct ceph_osd_request *req;
2553         u64 last_tid, next_tid = 0;
2554
2555         mutex_lock(&osdc->request_mutex);
2556         last_tid = osdc->last_tid;
2557         while (1) {
2558                 req = __lookup_request_ge(osdc, next_tid);
2559                 if (!req)
2560                         break;
2561                 if (req->r_tid > last_tid)
2562                         break;
2563
2564                 next_tid = req->r_tid + 1;
2565                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2566                         continue;
2567
2568                 ceph_osdc_get_request(req);
2569                 mutex_unlock(&osdc->request_mutex);
2570                 dout("sync waiting on tid %llu (last is %llu)\n",
2571                      req->r_tid, last_tid);
2572                 wait_for_completion(&req->r_safe_completion);
2573                 mutex_lock(&osdc->request_mutex);
2574                 ceph_osdc_put_request(req);
2575         }
2576         mutex_unlock(&osdc->request_mutex);
2577         dout("sync done (thru tid %llu)\n", last_tid);
2578 }
2579 EXPORT_SYMBOL(ceph_osdc_sync);
2580
2581 /*
2582  * Call all pending notify callbacks - for use after a watch is
2583  * unregistered, to make sure no more callbacks for it will be invoked
2584  */
2585 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2586 {
2587         flush_workqueue(osdc->notify_wq);
2588 }
2589 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2590
2591
2592 /*
2593  * init, shutdown
2594  */
2595 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2596 {
2597         int err;
2598
2599         dout("init\n");
2600         osdc->client = client;
2601         osdc->osdmap = NULL;
2602         init_rwsem(&osdc->map_sem);
2603         init_completion(&osdc->map_waiters);
2604         osdc->last_requested_map = 0;
2605         mutex_init(&osdc->request_mutex);
2606         osdc->last_tid = 0;
2607         osdc->osds = RB_ROOT;
2608         INIT_LIST_HEAD(&osdc->osd_lru);
2609         osdc->requests = RB_ROOT;
2610         INIT_LIST_HEAD(&osdc->req_lru);
2611         INIT_LIST_HEAD(&osdc->req_unsent);
2612         INIT_LIST_HEAD(&osdc->req_notarget);
2613         INIT_LIST_HEAD(&osdc->req_linger);
2614         osdc->num_requests = 0;
2615         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2616         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2617         spin_lock_init(&osdc->event_lock);
2618         osdc->event_tree = RB_ROOT;
2619         osdc->event_count = 0;
2620
2621         schedule_delayed_work(&osdc->osds_timeout_work,
2622            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2623
2624         err = -ENOMEM;
2625         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2626                                         sizeof(struct ceph_osd_request));
2627         if (!osdc->req_mempool)
2628                 goto out;
2629
2630         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2631                                 OSD_OP_FRONT_LEN, 10, true,
2632                                 "osd_op");
2633         if (err < 0)
2634                 goto out_mempool;
2635         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2636                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2637                                 "osd_op_reply");
2638         if (err < 0)
2639                 goto out_msgpool;
2640
2641         err = -ENOMEM;
2642         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2643         if (!osdc->notify_wq)
2644                 goto out_msgpool_reply;
2645
2646         return 0;
2647
2648 out_msgpool_reply:
2649         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2650 out_msgpool:
2651         ceph_msgpool_destroy(&osdc->msgpool_op);
2652 out_mempool:
2653         mempool_destroy(osdc->req_mempool);
2654 out:
2655         return err;
2656 }
2657
2658 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2659 {
2660         flush_workqueue(osdc->notify_wq);
2661         destroy_workqueue(osdc->notify_wq);
2662         cancel_delayed_work_sync(&osdc->timeout_work);
2663         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2664         if (osdc->osdmap) {
2665                 ceph_osdmap_destroy(osdc->osdmap);
2666                 osdc->osdmap = NULL;
2667         }
2668         remove_all_osds(osdc);
2669         mempool_destroy(osdc->req_mempool);
2670         ceph_msgpool_destroy(&osdc->msgpool_op);
2671         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2672 }
2673
2674 /*
2675  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2676  * *plen.  Return number of bytes read, or error.
2677  */
2678 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2679                         struct ceph_vino vino, struct ceph_file_layout *layout,
2680                         u64 off, u64 *plen,
2681                         u32 truncate_seq, u64 truncate_size,
2682                         struct page **pages, int num_pages, int page_align)
2683 {
2684         struct ceph_osd_request *req;
2685         int rc = 0;
2686
2687         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2688              vino.snap, off, *plen);
2689         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2690                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2691                                     NULL, truncate_seq, truncate_size,
2692                                     false);
2693         if (IS_ERR(req))
2694                 return PTR_ERR(req);
2695
2696         /* it may be a short read due to an object boundary */
2697
2698         osd_req_op_extent_osd_data_pages(req, 0,
2699                                 pages, *plen, page_align, false, false);
2700
2701         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2702              off, *plen, *plen, page_align);
2703
2704         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2705
2706         rc = ceph_osdc_start_request(osdc, req, false);
2707         if (!rc)
2708                 rc = ceph_osdc_wait_request(osdc, req);
2709
2710         ceph_osdc_put_request(req);
2711         dout("readpages result %d\n", rc);
2712         return rc;
2713 }
2714 EXPORT_SYMBOL(ceph_osdc_readpages);
2715
2716 /*
2717  * do a synchronous write on N pages
2718  */
2719 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2720                          struct ceph_file_layout *layout,
2721                          struct ceph_snap_context *snapc,
2722                          u64 off, u64 len,
2723                          u32 truncate_seq, u64 truncate_size,
2724                          struct timespec *mtime,
2725                          struct page **pages, int num_pages)
2726 {
2727         struct ceph_osd_request *req;
2728         int rc = 0;
2729         int page_align = off & ~PAGE_MASK;
2730
2731         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2732         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2733                                     CEPH_OSD_OP_WRITE,
2734                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2735                                     snapc, truncate_seq, truncate_size,
2736                                     true);
2737         if (IS_ERR(req))
2738                 return PTR_ERR(req);
2739
2740         /* it may be a short write due to an object boundary */
2741         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2742                                 false, false);
2743         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2744
2745         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2746
2747         rc = ceph_osdc_start_request(osdc, req, true);
2748         if (!rc)
2749                 rc = ceph_osdc_wait_request(osdc, req);
2750
2751         ceph_osdc_put_request(req);
2752         if (rc == 0)
2753                 rc = len;
2754         dout("writepages result %d\n", rc);
2755         return rc;
2756 }
2757 EXPORT_SYMBOL(ceph_osdc_writepages);
2758
2759 int ceph_osdc_setup(void)
2760 {
2761         BUG_ON(ceph_osd_request_cache);
2762         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2763                                         sizeof (struct ceph_osd_request),
2764                                         __alignof__(struct ceph_osd_request),
2765                                         0, NULL);
2766
2767         return ceph_osd_request_cache ? 0 : -ENOMEM;
2768 }
2769 EXPORT_SYMBOL(ceph_osdc_setup);
2770
2771 void ceph_osdc_cleanup(void)
2772 {
2773         BUG_ON(!ceph_osd_request_cache);
2774         kmem_cache_destroy(ceph_osd_request_cache);
2775         ceph_osd_request_cache = NULL;
2776 }
2777 EXPORT_SYMBOL(ceph_osdc_cleanup);
2778
2779 /*
2780  * handle incoming message
2781  */
2782 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2783 {
2784         struct ceph_osd *osd = con->private;
2785         struct ceph_osd_client *osdc;
2786         int type = le16_to_cpu(msg->hdr.type);
2787
2788         if (!osd)
2789                 goto out;
2790         osdc = osd->o_osdc;
2791
2792         switch (type) {
2793         case CEPH_MSG_OSD_MAP:
2794                 ceph_osdc_handle_map(osdc, msg);
2795                 break;
2796         case CEPH_MSG_OSD_OPREPLY:
2797                 handle_reply(osdc, msg, con);
2798                 break;
2799         case CEPH_MSG_WATCH_NOTIFY:
2800                 handle_watch_notify(osdc, msg);
2801                 break;
2802
2803         default:
2804                 pr_err("received unknown message type %d %s\n", type,
2805                        ceph_msg_type_name(type));
2806         }
2807 out:
2808         ceph_msg_put(msg);
2809 }
2810
2811 /*
2812  * lookup and return message for incoming reply.  set up reply message
2813  * pages.
2814  */
2815 static struct ceph_msg *get_reply(struct ceph_connection *con,
2816                                   struct ceph_msg_header *hdr,
2817                                   int *skip)
2818 {
2819         struct ceph_osd *osd = con->private;
2820         struct ceph_osd_client *osdc = osd->o_osdc;
2821         struct ceph_msg *m;
2822         struct ceph_osd_request *req;
2823         int front_len = le32_to_cpu(hdr->front_len);
2824         int data_len = le32_to_cpu(hdr->data_len);
2825         u64 tid;
2826
2827         tid = le64_to_cpu(hdr->tid);
2828         mutex_lock(&osdc->request_mutex);
2829         req = __lookup_request(osdc, tid);
2830         if (!req) {
2831                 *skip = 1;
2832                 m = NULL;
2833                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2834                      osd->o_osd);
2835                 goto out;
2836         }
2837
2838         if (req->r_reply->con)
2839                 dout("%s revoking msg %p from old con %p\n", __func__,
2840                      req->r_reply, req->r_reply->con);
2841         ceph_msg_revoke_incoming(req->r_reply);
2842
2843         if (front_len > req->r_reply->front_alloc_len) {
2844                 pr_warn("get_reply front %d > preallocated %d (%u#%llu)\n",
2845                         front_len, req->r_reply->front_alloc_len,
2846                         (unsigned int)con->peer_name.type,
2847                         le64_to_cpu(con->peer_name.num));
2848                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2849                                  false);
2850                 if (!m)
2851                         goto out;
2852                 ceph_msg_put(req->r_reply);
2853                 req->r_reply = m;
2854         }
2855         m = ceph_msg_get(req->r_reply);
2856
2857         if (data_len > 0) {
2858                 struct ceph_osd_data *osd_data;
2859
2860                 /*
2861                  * XXX This is assuming there is only one op containing
2862                  * XXX page data.  Probably OK for reads, but this
2863                  * XXX ought to be done more generally.
2864                  */
2865                 osd_data = osd_req_op_extent_osd_data(req, 0);
2866                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2867                         if (osd_data->pages &&
2868                                 unlikely(osd_data->length < data_len)) {
2869
2870                                 pr_warn("tid %lld reply has %d bytes we had only %llu bytes ready\n",
2871                                         tid, data_len, osd_data->length);
2872                                 *skip = 1;
2873                                 ceph_msg_put(m);
2874                                 m = NULL;
2875                                 goto out;
2876                         }
2877                 }
2878         }
2879         *skip = 0;
2880         dout("get_reply tid %lld %p\n", tid, m);
2881
2882 out:
2883         mutex_unlock(&osdc->request_mutex);
2884         return m;
2885
2886 }
2887
2888 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2889                                   struct ceph_msg_header *hdr,
2890                                   int *skip)
2891 {
2892         struct ceph_osd *osd = con->private;
2893         int type = le16_to_cpu(hdr->type);
2894         int front = le32_to_cpu(hdr->front_len);
2895
2896         *skip = 0;
2897         switch (type) {
2898         case CEPH_MSG_OSD_MAP:
2899         case CEPH_MSG_WATCH_NOTIFY:
2900                 return ceph_msg_new(type, front, GFP_NOFS, false);
2901         case CEPH_MSG_OSD_OPREPLY:
2902                 return get_reply(con, hdr, skip);
2903         default:
2904                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2905                         osd->o_osd);
2906                 *skip = 1;
2907                 return NULL;
2908         }
2909 }
2910
2911 /*
2912  * Wrappers to refcount containing ceph_osd struct
2913  */
2914 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2915 {
2916         struct ceph_osd *osd = con->private;
2917         if (get_osd(osd))
2918                 return con;
2919         return NULL;
2920 }
2921
2922 static void put_osd_con(struct ceph_connection *con)
2923 {
2924         struct ceph_osd *osd = con->private;
2925         put_osd(osd);
2926 }
2927
2928 /*
2929  * authentication
2930  */
2931 /*
2932  * Note: returned pointer is the address of a structure that's
2933  * managed separately.  Caller must *not* attempt to free it.
2934  */
2935 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2936                                         int *proto, int force_new)
2937 {
2938         struct ceph_osd *o = con->private;
2939         struct ceph_osd_client *osdc = o->o_osdc;
2940         struct ceph_auth_client *ac = osdc->client->monc.auth;
2941         struct ceph_auth_handshake *auth = &o->o_auth;
2942
2943         if (force_new && auth->authorizer) {
2944                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2945                 auth->authorizer = NULL;
2946         }
2947         if (!auth->authorizer) {
2948                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2949                                                       auth);
2950                 if (ret)
2951                         return ERR_PTR(ret);
2952         } else {
2953                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2954                                                      auth);
2955                 if (ret)
2956                         return ERR_PTR(ret);
2957         }
2958         *proto = ac->protocol;
2959
2960         return auth;
2961 }
2962
2963
2964 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2965 {
2966         struct ceph_osd *o = con->private;
2967         struct ceph_osd_client *osdc = o->o_osdc;
2968         struct ceph_auth_client *ac = osdc->client->monc.auth;
2969
2970         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2971 }
2972
2973 static int invalidate_authorizer(struct ceph_connection *con)
2974 {
2975         struct ceph_osd *o = con->private;
2976         struct ceph_osd_client *osdc = o->o_osdc;
2977         struct ceph_auth_client *ac = osdc->client->monc.auth;
2978
2979         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2980         return ceph_monc_validate_auth(&osdc->client->monc);
2981 }
2982
2983 static int sign_message(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_sign_message(auth, msg);
2988 }
2989
2990 static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
2991 {
2992         struct ceph_osd *o = con->private;
2993         struct ceph_auth_handshake *auth = &o->o_auth;
2994         return ceph_auth_check_message_signature(auth, msg);
2995 }
2996
2997 static const struct ceph_connection_operations osd_con_ops = {
2998         .get = get_osd_con,
2999         .put = put_osd_con,
3000         .dispatch = dispatch,
3001         .get_authorizer = get_authorizer,
3002         .verify_authorizer_reply = verify_authorizer_reply,
3003         .invalidate_authorizer = invalidate_authorizer,
3004         .alloc_msg = alloc_msg,
3005         .sign_message = sign_message,
3006         .check_message_signature = check_message_signature,
3007         .fault = osd_reset,
3008 };