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