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