Pileus Git - ~andy/linux/blob - net/ceph/osd_client.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/module.h>
   5 #include <linux/err.h>
   6 #include <linux/highmem.h>
   7 #include <linux/mm.h>
   8 #include <linux/pagemap.h>
   9 #include <linux/slab.h>
  10 #include <linux/uaccess.h>
  11 #ifdef CONFIG_BLOCK
  12 #include <linux/bio.h>
  13 #endif
  14
  15 #include <linux/ceph/libceph.h>
  16 #include <linux/ceph/osd_client.h>
  17 #include <linux/ceph/messenger.h>
  18 #include <linux/ceph/decode.h>
  19 #include <linux/ceph/auth.h>
  20 #include <linux/ceph/pagelist.h>
  21
  22 #define OSD_OP_FRONT_LEN        4096
  23 #define OSD_OPREPLY_FRONT_LEN   512
  24
  25 static 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_oloc.pool = -1;
 372
 373         /* create reply message */
 374         if (use_mempool)
 375                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 376         else
 377                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 378                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 379         if (!msg) {
 380                 ceph_osdc_put_request(req);
 381                 return NULL;
 382         }
 383         req->r_reply = msg;
 384
 385         /* create request message; allow space for oid */
 386         if (use_mempool)
 387                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 388         else
 389                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 390         if (!msg) {
 391                 ceph_osdc_put_request(req);
 392                 return NULL;
 393         }
 394
 395         memset(msg->front.iov_base, 0, msg->front.iov_len);
 396
 397         req->r_request = msg;
 398
 399         return req;
 400 }
 401 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 402
 403 static bool osd_req_opcode_valid(u16 opcode)
 404 {
 405         switch (opcode) {
 406         case CEPH_OSD_OP_READ:
 407         case CEPH_OSD_OP_STAT:
 408         case CEPH_OSD_OP_MAPEXT:
 409         case CEPH_OSD_OP_MASKTRUNC:
 410         case CEPH_OSD_OP_SPARSE_READ:
 411         case CEPH_OSD_OP_NOTIFY:
 412         case CEPH_OSD_OP_NOTIFY_ACK:
 413         case CEPH_OSD_OP_ASSERT_VER:
 414         case CEPH_OSD_OP_WRITE:
 415         case CEPH_OSD_OP_WRITEFULL:
 416         case CEPH_OSD_OP_TRUNCATE:
 417         case CEPH_OSD_OP_ZERO:
 418         case CEPH_OSD_OP_DELETE:
 419         case CEPH_OSD_OP_APPEND:
 420         case CEPH_OSD_OP_STARTSYNC:
 421         case CEPH_OSD_OP_SETTRUNC:
 422         case CEPH_OSD_OP_TRIMTRUNC:
 423         case CEPH_OSD_OP_TMAPUP:
 424         case CEPH_OSD_OP_TMAPPUT:
 425         case CEPH_OSD_OP_TMAPGET:
 426         case CEPH_OSD_OP_CREATE:
 427         case CEPH_OSD_OP_ROLLBACK:
 428         case CEPH_OSD_OP_WATCH:
 429         case CEPH_OSD_OP_OMAPGETKEYS:
 430         case CEPH_OSD_OP_OMAPGETVALS:
 431         case CEPH_OSD_OP_OMAPGETHEADER:
 432         case CEPH_OSD_OP_OMAPGETVALSBYKEYS:
 433         case CEPH_OSD_OP_OMAPSETVALS:
 434         case CEPH_OSD_OP_OMAPSETHEADER:
 435         case CEPH_OSD_OP_OMAPCLEAR:
 436         case CEPH_OSD_OP_OMAPRMKEYS:
 437         case CEPH_OSD_OP_OMAP_CMP:
 438         case CEPH_OSD_OP_CLONERANGE:
 439         case CEPH_OSD_OP_ASSERT_SRC_VERSION:
 440         case CEPH_OSD_OP_SRC_CMPXATTR:
 441         case CEPH_OSD_OP_GETXATTR:
 442         case CEPH_OSD_OP_GETXATTRS:
 443         case CEPH_OSD_OP_CMPXATTR:
 444         case CEPH_OSD_OP_SETXATTR:
 445         case CEPH_OSD_OP_SETXATTRS:
 446         case CEPH_OSD_OP_RESETXATTRS:
 447         case CEPH_OSD_OP_RMXATTR:
 448         case CEPH_OSD_OP_PULL:
 449         case CEPH_OSD_OP_PUSH:
 450         case CEPH_OSD_OP_BALANCEREADS:
 451         case CEPH_OSD_OP_UNBALANCEREADS:
 452         case CEPH_OSD_OP_SCRUB:
 453         case CEPH_OSD_OP_SCRUB_RESERVE:
 454         case CEPH_OSD_OP_SCRUB_UNRESERVE:
 455         case CEPH_OSD_OP_SCRUB_STOP:
 456         case CEPH_OSD_OP_SCRUB_MAP:
 457         case CEPH_OSD_OP_WRLOCK:
 458         case CEPH_OSD_OP_WRUNLOCK:
 459         case CEPH_OSD_OP_RDLOCK:
 460         case CEPH_OSD_OP_RDUNLOCK:
 461         case CEPH_OSD_OP_UPLOCK:
 462         case CEPH_OSD_OP_DNLOCK:
 463         case CEPH_OSD_OP_CALL:
 464         case CEPH_OSD_OP_PGLS:
 465         case CEPH_OSD_OP_PGLS_FILTER:
 466                 return true;
 467         default:
 468                 return false;
 469         }
 470 }
 471
 472 /*
 473  * This is an osd op init function for opcodes that have no data or
 474  * other information associated with them.  It also serves as a
 475  * common init routine for all the other init functions, below.
 476  */
 477 static struct ceph_osd_req_op *
 478 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
 479                                 u16 opcode)
 480 {
 481         struct ceph_osd_req_op *op;
 482
 483         BUG_ON(which >= osd_req->r_num_ops);
 484         BUG_ON(!osd_req_opcode_valid(opcode));
 485
 486         op = &osd_req->r_ops[which];
 487         memset(op, 0, sizeof (*op));
 488         op->op = opcode;
 489
 490         return op;
 491 }
 492
 493 void osd_req_op_init(struct ceph_osd_request *osd_req,
 494                                 unsigned int which, u16 opcode)
 495 {
 496         (void)_osd_req_op_init(osd_req, which, opcode);
 497 }
 498 EXPORT_SYMBOL(osd_req_op_init);
 499
 500 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 501                                 unsigned int which, u16 opcode,
 502                                 u64 offset, u64 length,
 503                                 u64 truncate_size, u32 truncate_seq)
 504 {
 505         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 506         size_t payload_len = 0;
 507
 508         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 509                opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
 510                opcode != CEPH_OSD_OP_TRUNCATE);
 511
 512         op->extent.offset = offset;
 513         op->extent.length = length;
 514         op->extent.truncate_size = truncate_size;
 515         op->extent.truncate_seq = truncate_seq;
 516         if (opcode == CEPH_OSD_OP_WRITE)
 517                 payload_len += length;
 518
 519         op->payload_len = payload_len;
 520 }
 521 EXPORT_SYMBOL(osd_req_op_extent_init);
 522
 523 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 524                                 unsigned int which, u64 length)
 525 {
 526         struct ceph_osd_req_op *op;
 527         u64 previous;
 528
 529         BUG_ON(which >= osd_req->r_num_ops);
 530         op = &osd_req->r_ops[which];
 531         previous = op->extent.length;
 532
 533         if (length == previous)
 534                 return;         /* Nothing to do */
 535         BUG_ON(length > previous);
 536
 537         op->extent.length = length;
 538         op->payload_len -= previous - length;
 539 }
 540 EXPORT_SYMBOL(osd_req_op_extent_update);
 541
 542 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
 543                         u16 opcode, const char *class, const char *method)
 544 {
 545         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 546         struct ceph_pagelist *pagelist;
 547         size_t payload_len = 0;
 548         size_t size;
 549
 550         BUG_ON(opcode != CEPH_OSD_OP_CALL);
 551
 552         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
 553         BUG_ON(!pagelist);
 554         ceph_pagelist_init(pagelist);
 555
 556         op->cls.class_name = class;
 557         size = strlen(class);
 558         BUG_ON(size > (size_t) U8_MAX);
 559         op->cls.class_len = size;
 560         ceph_pagelist_append(pagelist, class, size);
 561         payload_len += size;
 562
 563         op->cls.method_name = method;
 564         size = strlen(method);
 565         BUG_ON(size > (size_t) U8_MAX);
 566         op->cls.method_len = size;
 567         ceph_pagelist_append(pagelist, method, size);
 568         payload_len += size;
 569
 570         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
 571
 572         op->cls.argc = 0;       /* currently unused */
 573
 574         op->payload_len = payload_len;
 575 }
 576 EXPORT_SYMBOL(osd_req_op_cls_init);
 577
 578 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 579                                 unsigned int which, u16 opcode,
 580                                 u64 cookie, u64 version, int flag)
 581 {
 582         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 583
 584         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
 585
 586         op->watch.cookie = cookie;
 587         op->watch.ver = version;
 588         if (opcode == CEPH_OSD_OP_WATCH && flag)
 589                 op->watch.flag = (u8)1;
 590 }
 591 EXPORT_SYMBOL(osd_req_op_watch_init);
 592
 593 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 594                                 struct ceph_osd_data *osd_data)
 595 {
 596         u64 length = ceph_osd_data_length(osd_data);
 597
 598         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 599                 BUG_ON(length > (u64) SIZE_MAX);
 600                 if (length)
 601                         ceph_msg_data_add_pages(msg, osd_data->pages,
 602                                         length, osd_data->alignment);
 603         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
 604                 BUG_ON(!length);
 605                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
 606 #ifdef CONFIG_BLOCK
 607         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
 608                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
 609 #endif
 610         } else {
 611                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
 612         }
 613 }
 614
 615 static u64 osd_req_encode_op(struct ceph_osd_request *req,
 616                               struct ceph_osd_op *dst, unsigned int which)
 617 {
 618         struct ceph_osd_req_op *src;
 619         struct ceph_osd_data *osd_data;
 620         u64 request_data_len = 0;
 621         u64 data_length;
 622
 623         BUG_ON(which >= req->r_num_ops);
 624         src = &req->r_ops[which];
 625         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
 626                 pr_err("unrecognized osd opcode %d\n", src->op);
 627
 628                 return 0;
 629         }
 630
 631         switch (src->op) {
 632         case CEPH_OSD_OP_STAT:
 633                 osd_data = &src->raw_data_in;
 634                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 635                 break;
 636         case CEPH_OSD_OP_READ:
 637         case CEPH_OSD_OP_WRITE:
 638         case CEPH_OSD_OP_ZERO:
 639         case CEPH_OSD_OP_DELETE:
 640         case CEPH_OSD_OP_TRUNCATE:
 641                 if (src->op == CEPH_OSD_OP_WRITE)
 642                         request_data_len = src->extent.length;
 643                 dst->extent.offset = cpu_to_le64(src->extent.offset);
 644                 dst->extent.length = cpu_to_le64(src->extent.length);
 645                 dst->extent.truncate_size =
 646                         cpu_to_le64(src->extent.truncate_size);
 647                 dst->extent.truncate_seq =
 648                         cpu_to_le32(src->extent.truncate_seq);
 649                 osd_data = &src->extent.osd_data;
 650                 if (src->op == CEPH_OSD_OP_WRITE)
 651                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 652                 else
 653                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
 654                 break;
 655         case CEPH_OSD_OP_CALL:
 656                 dst->cls.class_len = src->cls.class_len;
 657                 dst->cls.method_len = src->cls.method_len;
 658                 osd_data = &src->cls.request_info;
 659                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 660                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
 661                 request_data_len = osd_data->pagelist->length;
 662
 663                 osd_data = &src->cls.request_data;
 664                 data_length = ceph_osd_data_length(osd_data);
 665                 if (data_length) {
 666                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
 667                         dst->cls.indata_len = cpu_to_le32(data_length);
 668                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 669                         src->payload_len += data_length;
 670                         request_data_len += data_length;
 671                 }
 672                 osd_data = &src->cls.response_data;
 673                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 674                 break;
 675         case CEPH_OSD_OP_STARTSYNC:
 676                 break;
 677         case CEPH_OSD_OP_NOTIFY_ACK:
 678         case CEPH_OSD_OP_WATCH:
 679                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 680                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 681                 dst->watch.flag = src->watch.flag;
 682                 break;
 683         default:
 684                 pr_err("unsupported osd opcode %s\n",
 685                         ceph_osd_op_name(src->op));
 686                 WARN_ON(1);
 687
 688                 return 0;
 689         }
 690         dst->op = cpu_to_le16(src->op);
 691         dst->payload_len = cpu_to_le32(src->payload_len);
 692
 693         return request_data_len;
 694 }
 695
 696 /*
 697  * build new request AND message, calculate layout, and adjust file
 698  * extent as needed.
 699  *
 700  * if the file was recently truncated, we include information about its
 701  * old and new size so that the object can be updated appropriately.  (we
 702  * avoid synchronously deleting truncated objects because it's slow.)
 703  *
 704  * if @do_sync, include a 'startsync' command so that the osd will flush
 705  * data quickly.
 706  */
 707 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 708                                                struct ceph_file_layout *layout,
 709                                                struct ceph_vino vino,
 710                                                u64 off, u64 *plen, int num_ops,
 711                                                int opcode, int flags,
 712                                                struct ceph_snap_context *snapc,
 713                                                u32 truncate_seq,
 714                                                u64 truncate_size,
 715                                                bool use_mempool)
 716 {
 717         struct ceph_osd_request *req;
 718         u64 objnum = 0;
 719         u64 objoff = 0;
 720         u64 objlen = 0;
 721         u32 object_size;
 722         u64 object_base;
 723         int r;
 724
 725         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 726                opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
 727                opcode != CEPH_OSD_OP_TRUNCATE);
 728
 729         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
 730                                         GFP_NOFS);
 731         if (!req)
 732                 return ERR_PTR(-ENOMEM);
 733
 734         req->r_flags = flags;
 735
 736         /* calculate max write size */
 737         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
 738         if (r < 0) {
 739                 ceph_osdc_put_request(req);
 740                 return ERR_PTR(r);
 741         }
 742
 743         object_size = le32_to_cpu(layout->fl_object_size);
 744         object_base = off - objoff;
 745         if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
 746                 if (truncate_size <= object_base) {
 747                         truncate_size = 0;
 748                 } else {
 749                         truncate_size -= object_base;
 750                         if (truncate_size > object_size)
 751                                 truncate_size = object_size;
 752                 }
 753         }
 754
 755         osd_req_op_extent_init(req, 0, opcode, objoff, objlen,
 756                                 truncate_size, truncate_seq);
 757
 758         /*
 759          * A second op in the ops array means the caller wants to
 760          * also issue a include a 'startsync' command so that the
 761          * osd will flush data quickly.
 762          */
 763         if (num_ops > 1)
 764                 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
 765
 766         req->r_oloc.pool = ceph_file_layout_pg_pool(*layout);
 767
 768         snprintf(req->r_oid.name, sizeof(req->r_oid.name),
 769                  "%llx.%08llx", vino.ino, objnum);
 770         req->r_oid.name_len = strlen(req->r_oid.name);
 771
 772         return req;
 773 }
 774 EXPORT_SYMBOL(ceph_osdc_new_request);
 775
 776 /*
 777  * We keep osd requests in an rbtree, sorted by ->r_tid.
 778  */
 779 static void __insert_request(struct ceph_osd_client *osdc,
 780                              struct ceph_osd_request *new)
 781 {
 782         struct rb_node **p = &osdc->requests.rb_node;
 783         struct rb_node *parent = NULL;
 784         struct ceph_osd_request *req = NULL;
 785
 786         while (*p) {
 787                 parent = *p;
 788                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 789                 if (new->r_tid < req->r_tid)
 790                         p = &(*p)->rb_left;
 791                 else if (new->r_tid > req->r_tid)
 792                         p = &(*p)->rb_right;
 793                 else
 794                         BUG();
 795         }
 796
 797         rb_link_node(&new->r_node, parent, p);
 798         rb_insert_color(&new->r_node, &osdc->requests);
 799 }
 800
 801 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 802                                                  u64 tid)
 803 {
 804         struct ceph_osd_request *req;
 805         struct rb_node *n = osdc->requests.rb_node;
 806
 807         while (n) {
 808                 req = rb_entry(n, struct ceph_osd_request, r_node);
 809                 if (tid < req->r_tid)
 810                         n = n->rb_left;
 811                 else if (tid > req->r_tid)
 812                         n = n->rb_right;
 813                 else
 814                         return req;
 815         }
 816         return NULL;
 817 }
 818
 819 static struct ceph_osd_request *
 820 __lookup_request_ge(struct ceph_osd_client *osdc,
 821                     u64 tid)
 822 {
 823         struct ceph_osd_request *req;
 824         struct rb_node *n = osdc->requests.rb_node;
 825
 826         while (n) {
 827                 req = rb_entry(n, struct ceph_osd_request, r_node);
 828                 if (tid < req->r_tid) {
 829                         if (!n->rb_left)
 830                                 return req;
 831                         n = n->rb_left;
 832                 } else if (tid > req->r_tid) {
 833                         n = n->rb_right;
 834                 } else {
 835                         return req;
 836                 }
 837         }
 838         return NULL;
 839 }
 840
 841 /*
 842  * Resubmit requests pending on the given osd.
 843  */
 844 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 845                                 struct ceph_osd *osd)
 846 {
 847         struct ceph_osd_request *req, *nreq;
 848         LIST_HEAD(resend);
 849         int err;
 850
 851         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 852         err = __reset_osd(osdc, osd);
 853         if (err)
 854                 return;
 855         /*
 856          * Build up a list of requests to resend by traversing the
 857          * osd's list of requests.  Requests for a given object are
 858          * sent in tid order, and that is also the order they're
 859          * kept on this list.  Therefore all requests that are in
 860          * flight will be found first, followed by all requests that
 861          * have not yet been sent.  And to resend requests while
 862          * preserving this order we will want to put any sent
 863          * requests back on the front of the osd client's unsent
 864          * list.
 865          *
 866          * So we build a separate ordered list of already-sent
 867          * requests for the affected osd and splice it onto the
 868          * front of the osd client's unsent list.  Once we've seen a
 869          * request that has not yet been sent we're done.  Those
 870          * requests are already sitting right where they belong.
 871          */
 872         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 873                 if (!req->r_sent)
 874                         break;
 875                 list_move_tail(&req->r_req_lru_item, &resend);
 876                 dout("requeueing %p tid %llu osd%d\n", req, req->r_tid,
 877                      osd->o_osd);
 878                 if (!req->r_linger)
 879                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 880         }
 881         list_splice(&resend, &osdc->req_unsent);
 882
 883         /*
 884          * Linger requests are re-registered before sending, which
 885          * sets up a new tid for each.  We add them to the unsent
 886          * list at the end to keep things in tid order.
 887          */
 888         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 889                                  r_linger_osd) {
 890                 /*
 891                  * reregister request prior to unregistering linger so
 892                  * that r_osd is preserved.
 893                  */
 894                 BUG_ON(!list_empty(&req->r_req_lru_item));
 895                 __register_request(osdc, req);
 896                 list_add_tail(&req->r_req_lru_item, &osdc->req_unsent);
 897                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
 898                 __unregister_linger_request(osdc, req);
 899                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 900                      osd->o_osd);
 901         }
 902 }
 903
 904 /*
 905  * If the osd connection drops, we need to resubmit all requests.
 906  */
 907 static void osd_reset(struct ceph_connection *con)
 908 {
 909         struct ceph_osd *osd = con->private;
 910         struct ceph_osd_client *osdc;
 911
 912         if (!osd)
 913                 return;
 914         dout("osd_reset osd%d\n", osd->o_osd);
 915         osdc = osd->o_osdc;
 916         down_read(&osdc->map_sem);
 917         mutex_lock(&osdc->request_mutex);
 918         __kick_osd_requests(osdc, osd);
 919         __send_queued(osdc);
 920         mutex_unlock(&osdc->request_mutex);
 921         up_read(&osdc->map_sem);
 922 }
 923
 924 /*
 925  * Track open sessions with osds.
 926  */
 927 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 928 {
 929         struct ceph_osd *osd;
 930
 931         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 932         if (!osd)
 933                 return NULL;
 934
 935         atomic_set(&osd->o_ref, 1);
 936         osd->o_osdc = osdc;
 937         osd->o_osd = onum;
 938         RB_CLEAR_NODE(&osd->o_node);
 939         INIT_LIST_HEAD(&osd->o_requests);
 940         INIT_LIST_HEAD(&osd->o_linger_requests);
 941         INIT_LIST_HEAD(&osd->o_osd_lru);
 942         osd->o_incarnation = 1;
 943
 944         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
 945
 946         INIT_LIST_HEAD(&osd->o_keepalive_item);
 947         return osd;
 948 }
 949
 950 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 951 {
 952         if (atomic_inc_not_zero(&osd->o_ref)) {
 953                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 954                      atomic_read(&osd->o_ref));
 955                 return osd;
 956         } else {
 957                 dout("get_osd %p FAIL\n", osd);
 958                 return NULL;
 959         }
 960 }
 961
 962 static void put_osd(struct ceph_osd *osd)
 963 {
 964         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 965              atomic_read(&osd->o_ref) - 1);
 966         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
 967                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 968
 969                 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
 970                 kfree(osd);
 971         }
 972 }
 973
 974 /*
 975  * remove an osd from our map
 976  */
 977 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 978 {
 979         dout("__remove_osd %p\n", osd);
 980         BUG_ON(!list_empty(&osd->o_requests));
 981         rb_erase(&osd->o_node, &osdc->osds);
 982         list_del_init(&osd->o_osd_lru);
 983         ceph_con_close(&osd->o_con);
 984         put_osd(osd);
 985 }
 986
 987 static void remove_all_osds(struct ceph_osd_client *osdc)
 988 {
 989         dout("%s %p\n", __func__, osdc);
 990         mutex_lock(&osdc->request_mutex);
 991         while (!RB_EMPTY_ROOT(&osdc->osds)) {
 992                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
 993                                                 struct ceph_osd, o_node);
 994                 __remove_osd(osdc, osd);
 995         }
 996         mutex_unlock(&osdc->request_mutex);
 997 }
 998
 999 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1000                               struct ceph_osd *osd)
1001 {
1002         dout("__move_osd_to_lru %p\n", osd);
1003         BUG_ON(!list_empty(&osd->o_osd_lru));
1004         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1005         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1006 }
1007
1008 static void __remove_osd_from_lru(struct ceph_osd *osd)
1009 {
1010         dout("__remove_osd_from_lru %p\n", osd);
1011         if (!list_empty(&osd->o_osd_lru))
1012                 list_del_init(&osd->o_osd_lru);
1013 }
1014
1015 static void remove_old_osds(struct ceph_osd_client *osdc)
1016 {
1017         struct ceph_osd *osd, *nosd;
1018
1019         dout("__remove_old_osds %p\n", osdc);
1020         mutex_lock(&osdc->request_mutex);
1021         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1022                 if (time_before(jiffies, osd->lru_ttl))
1023                         break;
1024                 __remove_osd(osdc, osd);
1025         }
1026         mutex_unlock(&osdc->request_mutex);
1027 }
1028
1029 /*
1030  * reset osd connect
1031  */
1032 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1033 {
1034         struct ceph_entity_addr *peer_addr;
1035
1036         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1037         if (list_empty(&osd->o_requests) &&
1038             list_empty(&osd->o_linger_requests)) {
1039                 __remove_osd(osdc, osd);
1040
1041                 return -ENODEV;
1042         }
1043
1044         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1045         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1046                         !ceph_con_opened(&osd->o_con)) {
1047                 struct ceph_osd_request *req;
1048
1049                 dout("osd addr hasn't changed and connection never opened, "
1050                      "letting msgr retry\n");
1051                 /* touch each r_stamp for handle_timeout()'s benfit */
1052                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1053                         req->r_stamp = jiffies;
1054
1055                 return -EAGAIN;
1056         }
1057
1058         ceph_con_close(&osd->o_con);
1059         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1060         osd->o_incarnation++;
1061
1062         return 0;
1063 }
1064
1065 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1066 {
1067         struct rb_node **p = &osdc->osds.rb_node;
1068         struct rb_node *parent = NULL;
1069         struct ceph_osd *osd = NULL;
1070
1071         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1072         while (*p) {
1073                 parent = *p;
1074                 osd = rb_entry(parent, struct ceph_osd, o_node);
1075                 if (new->o_osd < osd->o_osd)
1076                         p = &(*p)->rb_left;
1077                 else if (new->o_osd > osd->o_osd)
1078                         p = &(*p)->rb_right;
1079                 else
1080                         BUG();
1081         }
1082
1083         rb_link_node(&new->o_node, parent, p);
1084         rb_insert_color(&new->o_node, &osdc->osds);
1085 }
1086
1087 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1088 {
1089         struct ceph_osd *osd;
1090         struct rb_node *n = osdc->osds.rb_node;
1091
1092         while (n) {
1093                 osd = rb_entry(n, struct ceph_osd, o_node);
1094                 if (o < osd->o_osd)
1095                         n = n->rb_left;
1096                 else if (o > osd->o_osd)
1097                         n = n->rb_right;
1098                 else
1099                         return osd;
1100         }
1101         return NULL;
1102 }
1103
1104 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1105 {
1106         schedule_delayed_work(&osdc->timeout_work,
1107                         osdc->client->options->osd_keepalive_timeout * HZ);
1108 }
1109
1110 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1111 {
1112         cancel_delayed_work(&osdc->timeout_work);
1113 }
1114
1115 /*
1116  * Register request, assign tid.  If this is the first request, set up
1117  * the timeout event.
1118  */
1119 static void __register_request(struct ceph_osd_client *osdc,
1120                                struct ceph_osd_request *req)
1121 {
1122         req->r_tid = ++osdc->last_tid;
1123         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1124         dout("__register_request %p tid %lld\n", req, req->r_tid);
1125         __insert_request(osdc, req);
1126         ceph_osdc_get_request(req);
1127         osdc->num_requests++;
1128         if (osdc->num_requests == 1) {
1129                 dout(" first request, scheduling timeout\n");
1130                 __schedule_osd_timeout(osdc);
1131         }
1132 }
1133
1134 /*
1135  * called under osdc->request_mutex
1136  */
1137 static void __unregister_request(struct ceph_osd_client *osdc,
1138                                  struct ceph_osd_request *req)
1139 {
1140         if (RB_EMPTY_NODE(&req->r_node)) {
1141                 dout("__unregister_request %p tid %lld not registered\n",
1142                         req, req->r_tid);
1143                 return;
1144         }
1145
1146         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1147         rb_erase(&req->r_node, &osdc->requests);
1148         osdc->num_requests--;
1149
1150         if (req->r_osd) {
1151                 /* make sure the original request isn't in flight. */
1152                 ceph_msg_revoke(req->r_request);
1153
1154                 list_del_init(&req->r_osd_item);
1155                 if (list_empty(&req->r_osd->o_requests) &&
1156                     list_empty(&req->r_osd->o_linger_requests)) {
1157                         dout("moving osd to %p lru\n", req->r_osd);
1158                         __move_osd_to_lru(osdc, req->r_osd);
1159                 }
1160                 if (list_empty(&req->r_linger_item))
1161                         req->r_osd = NULL;
1162         }
1163
1164         list_del_init(&req->r_req_lru_item);
1165         ceph_osdc_put_request(req);
1166
1167         if (osdc->num_requests == 0) {
1168                 dout(" no requests, canceling timeout\n");
1169                 __cancel_osd_timeout(osdc);
1170         }
1171 }
1172
1173 /*
1174  * Cancel a previously queued request message
1175  */
1176 static void __cancel_request(struct ceph_osd_request *req)
1177 {
1178         if (req->r_sent && req->r_osd) {
1179                 ceph_msg_revoke(req->r_request);
1180                 req->r_sent = 0;
1181         }
1182 }
1183
1184 static void __register_linger_request(struct ceph_osd_client *osdc,
1185                                     struct ceph_osd_request *req)
1186 {
1187         dout("__register_linger_request %p\n", req);
1188         ceph_osdc_get_request(req);
1189         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1190         if (req->r_osd)
1191                 list_add_tail(&req->r_linger_osd,
1192                               &req->r_osd->o_linger_requests);
1193 }
1194
1195 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1196                                         struct ceph_osd_request *req)
1197 {
1198         dout("__unregister_linger_request %p\n", req);
1199         list_del_init(&req->r_linger_item);
1200         if (req->r_osd) {
1201                 list_del_init(&req->r_linger_osd);
1202
1203                 if (list_empty(&req->r_osd->o_requests) &&
1204                     list_empty(&req->r_osd->o_linger_requests)) {
1205                         dout("moving osd to %p lru\n", req->r_osd);
1206                         __move_osd_to_lru(osdc, req->r_osd);
1207                 }
1208                 if (list_empty(&req->r_osd_item))
1209                         req->r_osd = NULL;
1210         }
1211         ceph_osdc_put_request(req);
1212 }
1213
1214 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
1215                                          struct ceph_osd_request *req)
1216 {
1217         mutex_lock(&osdc->request_mutex);
1218         if (req->r_linger) {
1219                 req->r_linger = 0;
1220                 __unregister_linger_request(osdc, req);
1221         }
1222         mutex_unlock(&osdc->request_mutex);
1223 }
1224 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
1225
1226 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1227                                   struct ceph_osd_request *req)
1228 {
1229         if (!req->r_linger) {
1230                 dout("set_request_linger %p\n", req);
1231                 req->r_linger = 1;
1232         }
1233 }
1234 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1235
1236 /*
1237  * Returns whether a request should be blocked from being sent
1238  * based on the current osdmap and osd_client settings.
1239  *
1240  * Caller should hold map_sem for read.
1241  */
1242 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1243                                    struct ceph_osd_request *req)
1244 {
1245         bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1246         bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1247                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1248         return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1249                 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1250 }
1251
1252 /*
1253  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1254  * (as needed), and set the request r_osd appropriately.  If there is
1255  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1256  * (unsent, homeless) or leave on in-flight lru.
1257  *
1258  * Return 0 if unchanged, 1 if changed, or negative on error.
1259  *
1260  * Caller should hold map_sem for read and request_mutex.
1261  */
1262 static int __map_request(struct ceph_osd_client *osdc,
1263                          struct ceph_osd_request *req, int force_resend)
1264 {
1265         struct ceph_pg pgid;
1266         int acting[CEPH_PG_MAX_SIZE];
1267         int o = -1, num = 0;
1268         int err;
1269         bool was_paused;
1270
1271         dout("map_request %p tid %lld\n", req, req->r_tid);
1272         err = ceph_calc_ceph_pg(&pgid, req->r_oid.name, osdc->osdmap,
1273                                 req->r_oloc.pool);
1274         if (err) {
1275                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1276                 return err;
1277         }
1278         req->r_pgid = pgid;
1279
1280         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
1281         if (err > 0) {
1282                 o = acting[0];
1283                 num = err;
1284         }
1285
1286         was_paused = req->r_paused;
1287         req->r_paused = __req_should_be_paused(osdc, req);
1288         if (was_paused && !req->r_paused)
1289                 force_resend = 1;
1290
1291         if ((!force_resend &&
1292              req->r_osd && req->r_osd->o_osd == o &&
1293              req->r_sent >= req->r_osd->o_incarnation &&
1294              req->r_num_pg_osds == num &&
1295              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1296             (req->r_osd == NULL && o == -1) ||
1297             req->r_paused)
1298                 return 0;  /* no change */
1299
1300         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1301              req->r_tid, pgid.pool, pgid.seed, o,
1302              req->r_osd ? req->r_osd->o_osd : -1);
1303
1304         /* record full pg acting set */
1305         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1306         req->r_num_pg_osds = num;
1307
1308         if (req->r_osd) {
1309                 __cancel_request(req);
1310                 list_del_init(&req->r_osd_item);
1311                 req->r_osd = NULL;
1312         }
1313
1314         req->r_osd = __lookup_osd(osdc, o);
1315         if (!req->r_osd && o >= 0) {
1316                 err = -ENOMEM;
1317                 req->r_osd = create_osd(osdc, o);
1318                 if (!req->r_osd) {
1319                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1320                         goto out;
1321                 }
1322
1323                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1324                 __insert_osd(osdc, req->r_osd);
1325
1326                 ceph_con_open(&req->r_osd->o_con,
1327                               CEPH_ENTITY_TYPE_OSD, o,
1328                               &osdc->osdmap->osd_addr[o]);
1329         }
1330
1331         if (req->r_osd) {
1332                 __remove_osd_from_lru(req->r_osd);
1333                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1334                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1335         } else {
1336                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1337         }
1338         err = 1;   /* osd or pg changed */
1339
1340 out:
1341         return err;
1342 }
1343
1344 /*
1345  * caller should hold map_sem (for read) and request_mutex
1346  */
1347 static void __send_request(struct ceph_osd_client *osdc,
1348                            struct ceph_osd_request *req)
1349 {
1350         void *p;
1351
1352         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1353              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1354              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1355
1356         /* fill in message content that changes each time we send it */
1357         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1358         put_unaligned_le32(req->r_flags, req->r_request_flags);
1359         put_unaligned_le64(req->r_oloc.pool, req->r_request_pool);
1360         p = req->r_request_pgid;
1361         ceph_encode_64(&p, req->r_pgid.pool);
1362         ceph_encode_32(&p, req->r_pgid.seed);
1363         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1364         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1365                sizeof(req->r_reassert_version));
1366
1367         req->r_stamp = jiffies;
1368         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1369
1370         ceph_msg_get(req->r_request); /* send consumes a ref */
1371
1372         req->r_sent = req->r_osd->o_incarnation;
1373
1374         ceph_con_send(&req->r_osd->o_con, req->r_request);
1375 }
1376
1377 /*
1378  * Send any requests in the queue (req_unsent).
1379  */
1380 static void __send_queued(struct ceph_osd_client *osdc)
1381 {
1382         struct ceph_osd_request *req, *tmp;
1383
1384         dout("__send_queued\n");
1385         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1386                 __send_request(osdc, req);
1387 }
1388
1389 /*
1390  * Timeout callback, called every N seconds when 1 or more osd
1391  * requests has been active for more than N seconds.  When this
1392  * happens, we ping all OSDs with requests who have timed out to
1393  * ensure any communications channel reset is detected.  Reset the
1394  * request timeouts another N seconds in the future as we go.
1395  * Reschedule the timeout event another N seconds in future (unless
1396  * there are no open requests).
1397  */
1398 static void handle_timeout(struct work_struct *work)
1399 {
1400         struct ceph_osd_client *osdc =
1401                 container_of(work, struct ceph_osd_client, timeout_work.work);
1402         struct ceph_osd_request *req;
1403         struct ceph_osd *osd;
1404         unsigned long keepalive =
1405                 osdc->client->options->osd_keepalive_timeout * HZ;
1406         struct list_head slow_osds;
1407         dout("timeout\n");
1408         down_read(&osdc->map_sem);
1409
1410         ceph_monc_request_next_osdmap(&osdc->client->monc);
1411
1412         mutex_lock(&osdc->request_mutex);
1413
1414         /*
1415          * ping osds that are a bit slow.  this ensures that if there
1416          * is a break in the TCP connection we will notice, and reopen
1417          * a connection with that osd (from the fault callback).
1418          */
1419         INIT_LIST_HEAD(&slow_osds);
1420         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1421                 if (time_before(jiffies, req->r_stamp + keepalive))
1422                         break;
1423
1424                 osd = req->r_osd;
1425                 BUG_ON(!osd);
1426                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1427                      req->r_tid, osd->o_osd);
1428                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1429         }
1430         while (!list_empty(&slow_osds)) {
1431                 osd = list_entry(slow_osds.next, struct ceph_osd,
1432                                  o_keepalive_item);
1433                 list_del_init(&osd->o_keepalive_item);
1434                 ceph_con_keepalive(&osd->o_con);
1435         }
1436
1437         __schedule_osd_timeout(osdc);
1438         __send_queued(osdc);
1439         mutex_unlock(&osdc->request_mutex);
1440         up_read(&osdc->map_sem);
1441 }
1442
1443 static void handle_osds_timeout(struct work_struct *work)
1444 {
1445         struct ceph_osd_client *osdc =
1446                 container_of(work, struct ceph_osd_client,
1447                              osds_timeout_work.work);
1448         unsigned long delay =
1449                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1450
1451         dout("osds timeout\n");
1452         down_read(&osdc->map_sem);
1453         remove_old_osds(osdc);
1454         up_read(&osdc->map_sem);
1455
1456         schedule_delayed_work(&osdc->osds_timeout_work,
1457                               round_jiffies_relative(delay));
1458 }
1459
1460 static void complete_request(struct ceph_osd_request *req)
1461 {
1462         complete_all(&req->r_safe_completion);  /* fsync waiter */
1463 }
1464
1465 /*
1466  * handle osd op reply.  either call the callback if it is specified,
1467  * or do the completion to wake up the waiting thread.
1468  */
1469 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1470                          struct ceph_connection *con)
1471 {
1472         void *p, *end;
1473         struct ceph_osd_request *req;
1474         u64 tid;
1475         int object_len;
1476         unsigned int numops;
1477         int payload_len, flags;
1478         s32 result;
1479         s32 retry_attempt;
1480         struct ceph_pg pg;
1481         int err;
1482         u32 reassert_epoch;
1483         u64 reassert_version;
1484         u32 osdmap_epoch;
1485         int already_completed;
1486         u32 bytes;
1487         unsigned int i;
1488
1489         tid = le64_to_cpu(msg->hdr.tid);
1490         dout("handle_reply %p tid %llu\n", msg, tid);
1491
1492         p = msg->front.iov_base;
1493         end = p + msg->front.iov_len;
1494
1495         ceph_decode_need(&p, end, 4, bad);
1496         object_len = ceph_decode_32(&p);
1497         ceph_decode_need(&p, end, object_len, bad);
1498         p += object_len;
1499
1500         err = ceph_decode_pgid(&p, end, &pg);
1501         if (err)
1502                 goto bad;
1503
1504         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1505         flags = ceph_decode_64(&p);
1506         result = ceph_decode_32(&p);
1507         reassert_epoch = ceph_decode_32(&p);
1508         reassert_version = ceph_decode_64(&p);
1509         osdmap_epoch = ceph_decode_32(&p);
1510
1511         /* lookup */
1512         mutex_lock(&osdc->request_mutex);
1513         req = __lookup_request(osdc, tid);
1514         if (req == NULL) {
1515                 dout("handle_reply tid %llu dne\n", tid);
1516                 goto bad_mutex;
1517         }
1518         ceph_osdc_get_request(req);
1519
1520         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1521              req, result);
1522
1523         ceph_decode_need(&p, end, 4, bad_put);
1524         numops = ceph_decode_32(&p);
1525         if (numops > CEPH_OSD_MAX_OP)
1526                 goto bad_put;
1527         if (numops != req->r_num_ops)
1528                 goto bad_put;
1529         payload_len = 0;
1530         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1531         for (i = 0; i < numops; i++) {
1532                 struct ceph_osd_op *op = p;
1533                 int len;
1534
1535                 len = le32_to_cpu(op->payload_len);
1536                 req->r_reply_op_len[i] = len;
1537                 dout(" op %d has %d bytes\n", i, len);
1538                 payload_len += len;
1539                 p += sizeof(*op);
1540         }
1541         bytes = le32_to_cpu(msg->hdr.data_len);
1542         if (payload_len != bytes) {
1543                 pr_warning("sum of op payload lens %d != data_len %d",
1544                            payload_len, bytes);
1545                 goto bad_put;
1546         }
1547
1548         ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1549         retry_attempt = ceph_decode_32(&p);
1550         for (i = 0; i < numops; i++)
1551                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1552
1553         already_completed = req->r_got_reply;
1554
1555         if (!req->r_got_reply) {
1556
1557                 req->r_result = result;
1558                 dout("handle_reply result %d bytes %d\n", req->r_result,
1559                      bytes);
1560                 if (req->r_result == 0)
1561                         req->r_result = bytes;
1562
1563                 /* in case this is a write and we need to replay, */
1564                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1565                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1566
1567                 req->r_got_reply = 1;
1568         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1569                 dout("handle_reply tid %llu dup ack\n", tid);
1570                 mutex_unlock(&osdc->request_mutex);
1571                 goto done;
1572         }
1573
1574         dout("handle_reply tid %llu flags %d\n", tid, flags);
1575
1576         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1577                 __register_linger_request(osdc, req);
1578
1579         /* either this is a read, or we got the safe response */
1580         if (result < 0 ||
1581             (flags & CEPH_OSD_FLAG_ONDISK) ||
1582             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1583                 __unregister_request(osdc, req);
1584
1585         mutex_unlock(&osdc->request_mutex);
1586
1587         if (!already_completed) {
1588                 if (req->r_unsafe_callback &&
1589                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1590                         req->r_unsafe_callback(req, true);
1591                 if (req->r_callback)
1592                         req->r_callback(req, msg);
1593                 else
1594                         complete_all(&req->r_completion);
1595         }
1596
1597         if (flags & CEPH_OSD_FLAG_ONDISK) {
1598                 if (req->r_unsafe_callback && already_completed)
1599                         req->r_unsafe_callback(req, false);
1600                 complete_request(req);
1601         }
1602
1603 done:
1604         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1605         ceph_osdc_put_request(req);
1606         return;
1607
1608 bad_put:
1609         req->r_result = -EIO;
1610         __unregister_request(osdc, req);
1611         if (req->r_callback)
1612                 req->r_callback(req, msg);
1613         else
1614                 complete_all(&req->r_completion);
1615         complete_request(req);
1616         ceph_osdc_put_request(req);
1617 bad_mutex:
1618         mutex_unlock(&osdc->request_mutex);
1619 bad:
1620         pr_err("corrupt osd_op_reply got %d %d\n",
1621                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1622         ceph_msg_dump(msg);
1623 }
1624
1625 static void reset_changed_osds(struct ceph_osd_client *osdc)
1626 {
1627         struct rb_node *p, *n;
1628
1629         for (p = rb_first(&osdc->osds); p; p = n) {
1630                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1631
1632                 n = rb_next(p);
1633                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1634                     memcmp(&osd->o_con.peer_addr,
1635                            ceph_osd_addr(osdc->osdmap,
1636                                          osd->o_osd),
1637                            sizeof(struct ceph_entity_addr)) != 0)
1638                         __reset_osd(osdc, osd);
1639         }
1640 }
1641
1642 /*
1643  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1644  * no osd, request a new map.
1645  *
1646  * Caller should hold map_sem for read.
1647  */
1648 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1649                           bool force_resend_writes)
1650 {
1651         struct ceph_osd_request *req, *nreq;
1652         struct rb_node *p;
1653         int needmap = 0;
1654         int err;
1655         bool force_resend_req;
1656
1657         dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1658                 force_resend_writes ? " (force resend writes)" : "");
1659         mutex_lock(&osdc->request_mutex);
1660         for (p = rb_first(&osdc->requests); p; ) {
1661                 req = rb_entry(p, struct ceph_osd_request, r_node);
1662                 p = rb_next(p);
1663
1664                 /*
1665                  * For linger requests that have not yet been
1666                  * registered, move them to the linger list; they'll
1667                  * be sent to the osd in the loop below.  Unregister
1668                  * the request before re-registering it as a linger
1669                  * request to ensure the __map_request() below
1670                  * will decide it needs to be sent.
1671                  */
1672                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1673                         dout("%p tid %llu restart on osd%d\n",
1674                              req, req->r_tid,
1675                              req->r_osd ? req->r_osd->o_osd : -1);
1676                         ceph_osdc_get_request(req);
1677                         __unregister_request(osdc, req);
1678                         __register_linger_request(osdc, req);
1679                         ceph_osdc_put_request(req);
1680                         continue;
1681                 }
1682
1683                 force_resend_req = force_resend ||
1684                         (force_resend_writes &&
1685                                 req->r_flags & CEPH_OSD_FLAG_WRITE);
1686                 err = __map_request(osdc, req, force_resend_req);
1687                 if (err < 0)
1688                         continue;  /* error */
1689                 if (req->r_osd == NULL) {
1690                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1691                         needmap++;  /* request a newer map */
1692                 } else if (err > 0) {
1693                         if (!req->r_linger) {
1694                                 dout("%p tid %llu requeued on osd%d\n", req,
1695                                      req->r_tid,
1696                                      req->r_osd ? req->r_osd->o_osd : -1);
1697                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1698                         }
1699                 }
1700         }
1701
1702         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1703                                  r_linger_item) {
1704                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1705
1706                 err = __map_request(osdc, req,
1707                                     force_resend || force_resend_writes);
1708                 dout("__map_request returned %d\n", err);
1709                 if (err == 0)
1710                         continue;  /* no change and no osd was specified */
1711                 if (err < 0)
1712                         continue;  /* hrm! */
1713                 if (req->r_osd == NULL) {
1714                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1715                         needmap++;  /* request a newer map */
1716                         continue;
1717                 }
1718
1719                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1720                      req->r_osd ? req->r_osd->o_osd : -1);
1721                 __register_request(osdc, req);
1722                 __unregister_linger_request(osdc, req);
1723         }
1724         reset_changed_osds(osdc);
1725         mutex_unlock(&osdc->request_mutex);
1726
1727         if (needmap) {
1728                 dout("%d requests for down osds, need new map\n", needmap);
1729                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1730         }
1731 }
1732
1733
1734 /*
1735  * Process updated osd map.
1736  *
1737  * The message contains any number of incremental and full maps, normally
1738  * indicating some sort of topology change in the cluster.  Kick requests
1739  * off to different OSDs as needed.
1740  */
1741 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1742 {
1743         void *p, *end, *next;
1744         u32 nr_maps, maplen;
1745         u32 epoch;
1746         struct ceph_osdmap *newmap = NULL, *oldmap;
1747         int err;
1748         struct ceph_fsid fsid;
1749         bool was_full;
1750
1751         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1752         p = msg->front.iov_base;
1753         end = p + msg->front.iov_len;
1754
1755         /* verify fsid */
1756         ceph_decode_need(&p, end, sizeof(fsid), bad);
1757         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1758         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1759                 return;
1760
1761         down_write(&osdc->map_sem);
1762
1763         was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1764
1765         /* incremental maps */
1766         ceph_decode_32_safe(&p, end, nr_maps, bad);
1767         dout(" %d inc maps\n", nr_maps);
1768         while (nr_maps > 0) {
1769                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1770                 epoch = ceph_decode_32(&p);
1771                 maplen = ceph_decode_32(&p);
1772                 ceph_decode_need(&p, end, maplen, bad);
1773                 next = p + maplen;
1774                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1775                         dout("applying incremental map %u len %d\n",
1776                              epoch, maplen);
1777                         newmap = osdmap_apply_incremental(&p, next,
1778                                                           osdc->osdmap,
1779                                                           &osdc->client->msgr);
1780                         if (IS_ERR(newmap)) {
1781                                 err = PTR_ERR(newmap);
1782                                 goto bad;
1783                         }
1784                         BUG_ON(!newmap);
1785                         if (newmap != osdc->osdmap) {
1786                                 ceph_osdmap_destroy(osdc->osdmap);
1787                                 osdc->osdmap = newmap;
1788                         }
1789                         was_full = was_full ||
1790                                 ceph_osdmap_flag(osdc->osdmap,
1791                                                  CEPH_OSDMAP_FULL);
1792                         kick_requests(osdc, 0, was_full);
1793                 } else {
1794                         dout("ignoring incremental map %u len %d\n",
1795                              epoch, maplen);
1796                 }
1797                 p = next;
1798                 nr_maps--;
1799         }
1800         if (newmap)
1801                 goto done;
1802
1803         /* full maps */
1804         ceph_decode_32_safe(&p, end, nr_maps, bad);
1805         dout(" %d full maps\n", nr_maps);
1806         while (nr_maps) {
1807                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1808                 epoch = ceph_decode_32(&p);
1809                 maplen = ceph_decode_32(&p);
1810                 ceph_decode_need(&p, end, maplen, bad);
1811                 if (nr_maps > 1) {
1812                         dout("skipping non-latest full map %u len %d\n",
1813                              epoch, maplen);
1814                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1815                         dout("skipping full map %u len %d, "
1816                              "older than our %u\n", epoch, maplen,
1817                              osdc->osdmap->epoch);
1818                 } else {
1819                         int skipped_map = 0;
1820
1821                         dout("taking full map %u len %d\n", epoch, maplen);
1822                         newmap = osdmap_decode(&p, p+maplen);
1823                         if (IS_ERR(newmap)) {
1824                                 err = PTR_ERR(newmap);
1825                                 goto bad;
1826                         }
1827                         BUG_ON(!newmap);
1828                         oldmap = osdc->osdmap;
1829                         osdc->osdmap = newmap;
1830                         if (oldmap) {
1831                                 if (oldmap->epoch + 1 < newmap->epoch)
1832                                         skipped_map = 1;
1833                                 ceph_osdmap_destroy(oldmap);
1834                         }
1835                         was_full = was_full ||
1836                                 ceph_osdmap_flag(osdc->osdmap,
1837                                                  CEPH_OSDMAP_FULL);
1838                         kick_requests(osdc, skipped_map, was_full);
1839                 }
1840                 p += maplen;
1841                 nr_maps--;
1842         }
1843
1844         if (!osdc->osdmap)
1845                 goto bad;
1846 done:
1847         downgrade_write(&osdc->map_sem);
1848         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1849
1850         /*
1851          * subscribe to subsequent osdmap updates if full to ensure
1852          * we find out when we are no longer full and stop returning
1853          * ENOSPC.
1854          */
1855         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
1856                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
1857                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
1858                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1859
1860         mutex_lock(&osdc->request_mutex);
1861         __send_queued(osdc);
1862         mutex_unlock(&osdc->request_mutex);
1863         up_read(&osdc->map_sem);
1864         wake_up_all(&osdc->client->auth_wq);
1865         return;
1866
1867 bad:
1868         pr_err("osdc handle_map corrupt msg\n");
1869         ceph_msg_dump(msg);
1870         up_write(&osdc->map_sem);
1871         return;
1872 }
1873
1874 /*
1875  * watch/notify callback event infrastructure
1876  *
1877  * These callbacks are used both for watch and notify operations.
1878  */
1879 static void __release_event(struct kref *kref)
1880 {
1881         struct ceph_osd_event *event =
1882                 container_of(kref, struct ceph_osd_event, kref);
1883
1884         dout("__release_event %p\n", event);
1885         kfree(event);
1886 }
1887
1888 static void get_event(struct ceph_osd_event *event)
1889 {
1890         kref_get(&event->kref);
1891 }
1892
1893 void ceph_osdc_put_event(struct ceph_osd_event *event)
1894 {
1895         kref_put(&event->kref, __release_event);
1896 }
1897 EXPORT_SYMBOL(ceph_osdc_put_event);
1898
1899 static void __insert_event(struct ceph_osd_client *osdc,
1900                              struct ceph_osd_event *new)
1901 {
1902         struct rb_node **p = &osdc->event_tree.rb_node;
1903         struct rb_node *parent = NULL;
1904         struct ceph_osd_event *event = NULL;
1905
1906         while (*p) {
1907                 parent = *p;
1908                 event = rb_entry(parent, struct ceph_osd_event, node);
1909                 if (new->cookie < event->cookie)
1910                         p = &(*p)->rb_left;
1911                 else if (new->cookie > event->cookie)
1912                         p = &(*p)->rb_right;
1913                 else
1914                         BUG();
1915         }
1916
1917         rb_link_node(&new->node, parent, p);
1918         rb_insert_color(&new->node, &osdc->event_tree);
1919 }
1920
1921 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1922                                                 u64 cookie)
1923 {
1924         struct rb_node **p = &osdc->event_tree.rb_node;
1925         struct rb_node *parent = NULL;
1926         struct ceph_osd_event *event = NULL;
1927
1928         while (*p) {
1929                 parent = *p;
1930                 event = rb_entry(parent, struct ceph_osd_event, node);
1931                 if (cookie < event->cookie)
1932                         p = &(*p)->rb_left;
1933                 else if (cookie > event->cookie)
1934                         p = &(*p)->rb_right;
1935                 else
1936                         return event;
1937         }
1938         return NULL;
1939 }
1940
1941 static void __remove_event(struct ceph_osd_event *event)
1942 {
1943         struct ceph_osd_client *osdc = event->osdc;
1944
1945         if (!RB_EMPTY_NODE(&event->node)) {
1946                 dout("__remove_event removed %p\n", event);
1947                 rb_erase(&event->node, &osdc->event_tree);
1948                 ceph_osdc_put_event(event);
1949         } else {
1950                 dout("__remove_event didn't remove %p\n", event);
1951         }
1952 }
1953
1954 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1955                            void (*event_cb)(u64, u64, u8, void *),
1956                            void *data, struct ceph_osd_event **pevent)
1957 {
1958         struct ceph_osd_event *event;
1959
1960         event = kmalloc(sizeof(*event), GFP_NOIO);
1961         if (!event)
1962                 return -ENOMEM;
1963
1964         dout("create_event %p\n", event);
1965         event->cb = event_cb;
1966         event->one_shot = 0;
1967         event->data = data;
1968         event->osdc = osdc;
1969         INIT_LIST_HEAD(&event->osd_node);
1970         RB_CLEAR_NODE(&event->node);
1971         kref_init(&event->kref);   /* one ref for us */
1972         kref_get(&event->kref);    /* one ref for the caller */
1973
1974         spin_lock(&osdc->event_lock);
1975         event->cookie = ++osdc->event_count;
1976         __insert_event(osdc, event);
1977         spin_unlock(&osdc->event_lock);
1978
1979         *pevent = event;
1980         return 0;
1981 }
1982 EXPORT_SYMBOL(ceph_osdc_create_event);
1983
1984 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1985 {
1986         struct ceph_osd_client *osdc = event->osdc;
1987
1988         dout("cancel_event %p\n", event);
1989         spin_lock(&osdc->event_lock);
1990         __remove_event(event);
1991         spin_unlock(&osdc->event_lock);
1992         ceph_osdc_put_event(event); /* caller's */
1993 }
1994 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1995
1996
1997 static void do_event_work(struct work_struct *work)
1998 {
1999         struct ceph_osd_event_work *event_work =
2000                 container_of(work, struct ceph_osd_event_work, work);
2001         struct ceph_osd_event *event = event_work->event;
2002         u64 ver = event_work->ver;
2003         u64 notify_id = event_work->notify_id;
2004         u8 opcode = event_work->opcode;
2005
2006         dout("do_event_work completing %p\n", event);
2007         event->cb(ver, notify_id, opcode, event->data);
2008         dout("do_event_work completed %p\n", event);
2009         ceph_osdc_put_event(event);
2010         kfree(event_work);
2011 }
2012
2013
2014 /*
2015  * Process osd watch notifications
2016  */
2017 static void handle_watch_notify(struct ceph_osd_client *osdc,
2018                                 struct ceph_msg *msg)
2019 {
2020         void *p, *end;
2021         u8 proto_ver;
2022         u64 cookie, ver, notify_id;
2023         u8 opcode;
2024         struct ceph_osd_event *event;
2025         struct ceph_osd_event_work *event_work;
2026
2027         p = msg->front.iov_base;
2028         end = p + msg->front.iov_len;
2029
2030         ceph_decode_8_safe(&p, end, proto_ver, bad);
2031         ceph_decode_8_safe(&p, end, opcode, bad);
2032         ceph_decode_64_safe(&p, end, cookie, bad);
2033         ceph_decode_64_safe(&p, end, ver, bad);
2034         ceph_decode_64_safe(&p, end, notify_id, bad);
2035
2036         spin_lock(&osdc->event_lock);
2037         event = __find_event(osdc, cookie);
2038         if (event) {
2039                 BUG_ON(event->one_shot);
2040                 get_event(event);
2041         }
2042         spin_unlock(&osdc->event_lock);
2043         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2044              cookie, ver, event);
2045         if (event) {
2046                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2047                 if (!event_work) {
2048                         dout("ERROR: could not allocate event_work\n");
2049                         goto done_err;
2050                 }
2051                 INIT_WORK(&event_work->work, do_event_work);
2052                 event_work->event = event;
2053                 event_work->ver = ver;
2054                 event_work->notify_id = notify_id;
2055                 event_work->opcode = opcode;
2056                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
2057                         dout("WARNING: failed to queue notify event work\n");
2058                         goto done_err;
2059                 }
2060         }
2061
2062         return;
2063
2064 done_err:
2065         ceph_osdc_put_event(event);
2066         return;
2067
2068 bad:
2069         pr_err("osdc handle_watch_notify corrupt msg\n");
2070         return;
2071 }
2072
2073 /*
2074  * build new request AND message
2075  *
2076  */
2077 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2078                                 struct ceph_snap_context *snapc, u64 snap_id,
2079                                 struct timespec *mtime)
2080 {
2081         struct ceph_msg *msg = req->r_request;
2082         void *p;
2083         size_t msg_size;
2084         int flags = req->r_flags;
2085         u64 data_len;
2086         unsigned int i;
2087
2088         req->r_snapid = snap_id;
2089         req->r_snapc = ceph_get_snap_context(snapc);
2090
2091         /* encode request */
2092         msg->hdr.version = cpu_to_le16(4);
2093
2094         p = msg->front.iov_base;
2095         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2096         req->r_request_osdmap_epoch = p;
2097         p += 4;
2098         req->r_request_flags = p;
2099         p += 4;
2100         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2101                 ceph_encode_timespec(p, mtime);
2102         p += sizeof(struct ceph_timespec);
2103         req->r_request_reassert_version = p;
2104         p += sizeof(struct ceph_eversion); /* will get filled in */
2105
2106         /* oloc */
2107         ceph_encode_8(&p, 4);
2108         ceph_encode_8(&p, 4);
2109         ceph_encode_32(&p, 8 + 4 + 4);
2110         req->r_request_pool = p;
2111         p += 8;
2112         ceph_encode_32(&p, -1);  /* preferred */
2113         ceph_encode_32(&p, 0);   /* key len */
2114
2115         ceph_encode_8(&p, 1);
2116         req->r_request_pgid = p;
2117         p += 8 + 4;
2118         ceph_encode_32(&p, -1);  /* preferred */
2119
2120         /* oid */
2121         ceph_encode_32(&p, req->r_oid.name_len);
2122         memcpy(p, req->r_oid.name, req->r_oid.name_len);
2123         dout("oid '%.*s' len %d\n", req->r_oid.name_len,
2124              req->r_oid.name, req->r_oid.name_len);
2125         p += req->r_oid.name_len;
2126
2127         /* ops--can imply data */
2128         ceph_encode_16(&p, (u16)req->r_num_ops);
2129         data_len = 0;
2130         for (i = 0; i < req->r_num_ops; i++) {
2131                 data_len += osd_req_encode_op(req, p, i);
2132                 p += sizeof(struct ceph_osd_op);
2133         }
2134
2135         /* snaps */
2136         ceph_encode_64(&p, req->r_snapid);
2137         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2138         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2139         if (req->r_snapc) {
2140                 for (i = 0; i < snapc->num_snaps; i++) {
2141                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2142                 }
2143         }
2144
2145         req->r_request_attempts = p;
2146         p += 4;
2147
2148         /* data */
2149         if (flags & CEPH_OSD_FLAG_WRITE) {
2150                 u16 data_off;
2151
2152                 /*
2153                  * The header "data_off" is a hint to the receiver
2154                  * allowing it to align received data into its
2155                  * buffers such that there's no need to re-copy
2156                  * it before writing it to disk (direct I/O).
2157                  */
2158                 data_off = (u16) (off & 0xffff);
2159                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2160         }
2161         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2162
2163         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2164         msg_size = p - msg->front.iov_base;
2165         msg->front.iov_len = msg_size;
2166         msg->hdr.front_len = cpu_to_le32(msg_size);
2167
2168         dout("build_request msg_size was %d\n", (int)msg_size);
2169 }
2170 EXPORT_SYMBOL(ceph_osdc_build_request);
2171
2172 /*
2173  * Register request, send initial attempt.
2174  */
2175 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2176                             struct ceph_osd_request *req,
2177                             bool nofail)
2178 {
2179         int rc = 0;
2180
2181         down_read(&osdc->map_sem);
2182         mutex_lock(&osdc->request_mutex);
2183         __register_request(osdc, req);
2184         req->r_sent = 0;
2185         req->r_got_reply = 0;
2186         rc = __map_request(osdc, req, 0);
2187         if (rc < 0) {
2188                 if (nofail) {
2189                         dout("osdc_start_request failed map, "
2190                                 " will retry %lld\n", req->r_tid);
2191                         rc = 0;
2192                 } else {
2193                         __unregister_request(osdc, req);
2194                 }
2195                 goto out_unlock;
2196         }
2197         if (req->r_osd == NULL) {
2198                 dout("send_request %p no up osds in pg\n", req);
2199                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2200         } else {
2201                 __send_queued(osdc);
2202         }
2203         rc = 0;
2204 out_unlock:
2205         mutex_unlock(&osdc->request_mutex);
2206         up_read(&osdc->map_sem);
2207         return rc;
2208 }
2209 EXPORT_SYMBOL(ceph_osdc_start_request);
2210
2211 /*
2212  * wait for a request to complete
2213  */
2214 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2215                            struct ceph_osd_request *req)
2216 {
2217         int rc;
2218
2219         rc = wait_for_completion_interruptible(&req->r_completion);
2220         if (rc < 0) {
2221                 mutex_lock(&osdc->request_mutex);
2222                 __cancel_request(req);
2223                 __unregister_request(osdc, req);
2224                 mutex_unlock(&osdc->request_mutex);
2225                 complete_request(req);
2226                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
2227                 return rc;
2228         }
2229
2230         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
2231         return req->r_result;
2232 }
2233 EXPORT_SYMBOL(ceph_osdc_wait_request);
2234
2235 /*
2236  * sync - wait for all in-flight requests to flush.  avoid starvation.
2237  */
2238 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2239 {
2240         struct ceph_osd_request *req;
2241         u64 last_tid, next_tid = 0;
2242
2243         mutex_lock(&osdc->request_mutex);
2244         last_tid = osdc->last_tid;
2245         while (1) {
2246                 req = __lookup_request_ge(osdc, next_tid);
2247                 if (!req)
2248                         break;
2249                 if (req->r_tid > last_tid)
2250                         break;
2251
2252                 next_tid = req->r_tid + 1;
2253                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2254                         continue;
2255
2256                 ceph_osdc_get_request(req);
2257                 mutex_unlock(&osdc->request_mutex);
2258                 dout("sync waiting on tid %llu (last is %llu)\n",
2259                      req->r_tid, last_tid);
2260                 wait_for_completion(&req->r_safe_completion);
2261                 mutex_lock(&osdc->request_mutex);
2262                 ceph_osdc_put_request(req);
2263         }
2264         mutex_unlock(&osdc->request_mutex);
2265         dout("sync done (thru tid %llu)\n", last_tid);
2266 }
2267 EXPORT_SYMBOL(ceph_osdc_sync);
2268
2269 /*
2270  * Call all pending notify callbacks - for use after a watch is
2271  * unregistered, to make sure no more callbacks for it will be invoked
2272  */
2273 extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2274 {
2275         flush_workqueue(osdc->notify_wq);
2276 }
2277 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2278
2279
2280 /*
2281  * init, shutdown
2282  */
2283 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2284 {
2285         int err;
2286
2287         dout("init\n");
2288         osdc->client = client;
2289         osdc->osdmap = NULL;
2290         init_rwsem(&osdc->map_sem);
2291         init_completion(&osdc->map_waiters);
2292         osdc->last_requested_map = 0;
2293         mutex_init(&osdc->request_mutex);
2294         osdc->last_tid = 0;
2295         osdc->osds = RB_ROOT;
2296         INIT_LIST_HEAD(&osdc->osd_lru);
2297         osdc->requests = RB_ROOT;
2298         INIT_LIST_HEAD(&osdc->req_lru);
2299         INIT_LIST_HEAD(&osdc->req_unsent);
2300         INIT_LIST_HEAD(&osdc->req_notarget);
2301         INIT_LIST_HEAD(&osdc->req_linger);
2302         osdc->num_requests = 0;
2303         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2304         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2305         spin_lock_init(&osdc->event_lock);
2306         osdc->event_tree = RB_ROOT;
2307         osdc->event_count = 0;
2308
2309         schedule_delayed_work(&osdc->osds_timeout_work,
2310            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2311
2312         err = -ENOMEM;
2313         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2314                                         sizeof(struct ceph_osd_request));
2315         if (!osdc->req_mempool)
2316                 goto out;
2317
2318         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2319                                 OSD_OP_FRONT_LEN, 10, true,
2320                                 "osd_op");
2321         if (err < 0)
2322                 goto out_mempool;
2323         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2324                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2325                                 "osd_op_reply");
2326         if (err < 0)
2327                 goto out_msgpool;
2328
2329         err = -ENOMEM;
2330         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2331         if (!osdc->notify_wq)
2332                 goto out_msgpool;
2333         return 0;
2334
2335 out_msgpool:
2336         ceph_msgpool_destroy(&osdc->msgpool_op);
2337 out_mempool:
2338         mempool_destroy(osdc->req_mempool);
2339 out:
2340         return err;
2341 }
2342
2343 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2344 {
2345         flush_workqueue(osdc->notify_wq);
2346         destroy_workqueue(osdc->notify_wq);
2347         cancel_delayed_work_sync(&osdc->timeout_work);
2348         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2349         if (osdc->osdmap) {
2350                 ceph_osdmap_destroy(osdc->osdmap);
2351                 osdc->osdmap = NULL;
2352         }
2353         remove_all_osds(osdc);
2354         mempool_destroy(osdc->req_mempool);
2355         ceph_msgpool_destroy(&osdc->msgpool_op);
2356         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2357 }
2358
2359 /*
2360  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2361  * *plen.  Return number of bytes read, or error.
2362  */
2363 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2364                         struct ceph_vino vino, struct ceph_file_layout *layout,
2365                         u64 off, u64 *plen,
2366                         u32 truncate_seq, u64 truncate_size,
2367                         struct page **pages, int num_pages, int page_align)
2368 {
2369         struct ceph_osd_request *req;
2370         int rc = 0;
2371
2372         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2373              vino.snap, off, *plen);
2374         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 1,
2375                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2376                                     NULL, truncate_seq, truncate_size,
2377                                     false);
2378         if (IS_ERR(req))
2379                 return PTR_ERR(req);
2380
2381         /* it may be a short read due to an object boundary */
2382
2383         osd_req_op_extent_osd_data_pages(req, 0,
2384                                 pages, *plen, page_align, false, false);
2385
2386         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2387              off, *plen, *plen, page_align);
2388
2389         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2390
2391         rc = ceph_osdc_start_request(osdc, req, false);
2392         if (!rc)
2393                 rc = ceph_osdc_wait_request(osdc, req);
2394
2395         ceph_osdc_put_request(req);
2396         dout("readpages result %d\n", rc);
2397         return rc;
2398 }
2399 EXPORT_SYMBOL(ceph_osdc_readpages);
2400
2401 /*
2402  * do a synchronous write on N pages
2403  */
2404 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2405                          struct ceph_file_layout *layout,
2406                          struct ceph_snap_context *snapc,
2407                          u64 off, u64 len,
2408                          u32 truncate_seq, u64 truncate_size,
2409                          struct timespec *mtime,
2410                          struct page **pages, int num_pages)
2411 {
2412         struct ceph_osd_request *req;
2413         int rc = 0;
2414         int page_align = off & ~PAGE_MASK;
2415
2416         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2417         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 1,
2418                                     CEPH_OSD_OP_WRITE,
2419                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2420                                     snapc, truncate_seq, truncate_size,
2421                                     true);
2422         if (IS_ERR(req))
2423                 return PTR_ERR(req);
2424
2425         /* it may be a short write due to an object boundary */
2426         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2427                                 false, false);
2428         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2429
2430         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2431
2432         rc = ceph_osdc_start_request(osdc, req, true);
2433         if (!rc)
2434                 rc = ceph_osdc_wait_request(osdc, req);
2435
2436         ceph_osdc_put_request(req);
2437         if (rc == 0)
2438                 rc = len;
2439         dout("writepages result %d\n", rc);
2440         return rc;
2441 }
2442 EXPORT_SYMBOL(ceph_osdc_writepages);
2443
2444 int ceph_osdc_setup(void)
2445 {
2446         BUG_ON(ceph_osd_request_cache);
2447         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2448                                         sizeof (struct ceph_osd_request),
2449                                         __alignof__(struct ceph_osd_request),
2450                                         0, NULL);
2451
2452         return ceph_osd_request_cache ? 0 : -ENOMEM;
2453 }
2454 EXPORT_SYMBOL(ceph_osdc_setup);
2455
2456 void ceph_osdc_cleanup(void)
2457 {
2458         BUG_ON(!ceph_osd_request_cache);
2459         kmem_cache_destroy(ceph_osd_request_cache);
2460         ceph_osd_request_cache = NULL;
2461 }
2462 EXPORT_SYMBOL(ceph_osdc_cleanup);
2463
2464 /*
2465  * handle incoming message
2466  */
2467 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2468 {
2469         struct ceph_osd *osd = con->private;
2470         struct ceph_osd_client *osdc;
2471         int type = le16_to_cpu(msg->hdr.type);
2472
2473         if (!osd)
2474                 goto out;
2475         osdc = osd->o_osdc;
2476
2477         switch (type) {
2478         case CEPH_MSG_OSD_MAP:
2479                 ceph_osdc_handle_map(osdc, msg);
2480                 break;
2481         case CEPH_MSG_OSD_OPREPLY:
2482                 handle_reply(osdc, msg, con);
2483                 break;
2484         case CEPH_MSG_WATCH_NOTIFY:
2485                 handle_watch_notify(osdc, msg);
2486                 break;
2487
2488         default:
2489                 pr_err("received unknown message type %d %s\n", type,
2490                        ceph_msg_type_name(type));
2491         }
2492 out:
2493         ceph_msg_put(msg);
2494 }
2495
2496 /*
2497  * lookup and return message for incoming reply.  set up reply message
2498  * pages.
2499  */
2500 static struct ceph_msg *get_reply(struct ceph_connection *con,
2501                                   struct ceph_msg_header *hdr,
2502                                   int *skip)
2503 {
2504         struct ceph_osd *osd = con->private;
2505         struct ceph_osd_client *osdc = osd->o_osdc;
2506         struct ceph_msg *m;
2507         struct ceph_osd_request *req;
2508         int front_len = le32_to_cpu(hdr->front_len);
2509         int data_len = le32_to_cpu(hdr->data_len);
2510         u64 tid;
2511
2512         tid = le64_to_cpu(hdr->tid);
2513         mutex_lock(&osdc->request_mutex);
2514         req = __lookup_request(osdc, tid);
2515         if (!req) {
2516                 *skip = 1;
2517                 m = NULL;
2518                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2519                      osd->o_osd);
2520                 goto out;
2521         }
2522
2523         if (req->r_reply->con)
2524                 dout("%s revoking msg %p from old con %p\n", __func__,
2525                      req->r_reply, req->r_reply->con);
2526         ceph_msg_revoke_incoming(req->r_reply);
2527
2528         if (front_len > req->r_reply->front_alloc_len) {
2529                 pr_warning("get_reply front %d > preallocated %d (%u#%llu)\n",
2530                            front_len, req->r_reply->front_alloc_len,
2531                            (unsigned int)con->peer_name.type,
2532                            le64_to_cpu(con->peer_name.num));
2533                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2534                                  false);
2535                 if (!m)
2536                         goto out;
2537                 ceph_msg_put(req->r_reply);
2538                 req->r_reply = m;
2539         }
2540         m = ceph_msg_get(req->r_reply);
2541
2542         if (data_len > 0) {
2543                 struct ceph_osd_data *osd_data;
2544
2545                 /*
2546                  * XXX This is assuming there is only one op containing
2547                  * XXX page data.  Probably OK for reads, but this
2548                  * XXX ought to be done more generally.
2549                  */
2550                 osd_data = osd_req_op_extent_osd_data(req, 0);
2551                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2552                         if (osd_data->pages &&
2553                                 unlikely(osd_data->length < data_len)) {
2554
2555                                 pr_warning("tid %lld reply has %d bytes "
2556                                         "we had only %llu bytes ready\n",
2557                                         tid, data_len, osd_data->length);
2558                                 *skip = 1;
2559                                 ceph_msg_put(m);
2560                                 m = NULL;
2561                                 goto out;
2562                         }
2563                 }
2564         }
2565         *skip = 0;
2566         dout("get_reply tid %lld %p\n", tid, m);
2567
2568 out:
2569         mutex_unlock(&osdc->request_mutex);
2570         return m;
2571
2572 }
2573
2574 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2575                                   struct ceph_msg_header *hdr,
2576                                   int *skip)
2577 {
2578         struct ceph_osd *osd = con->private;
2579         int type = le16_to_cpu(hdr->type);
2580         int front = le32_to_cpu(hdr->front_len);
2581
2582         *skip = 0;
2583         switch (type) {
2584         case CEPH_MSG_OSD_MAP:
2585         case CEPH_MSG_WATCH_NOTIFY:
2586                 return ceph_msg_new(type, front, GFP_NOFS, false);
2587         case CEPH_MSG_OSD_OPREPLY:
2588                 return get_reply(con, hdr, skip);
2589         default:
2590                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2591                         osd->o_osd);
2592                 *skip = 1;
2593                 return NULL;
2594         }
2595 }
2596
2597 /*
2598  * Wrappers to refcount containing ceph_osd struct
2599  */
2600 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2601 {
2602         struct ceph_osd *osd = con->private;
2603         if (get_osd(osd))
2604                 return con;
2605         return NULL;
2606 }
2607
2608 static void put_osd_con(struct ceph_connection *con)
2609 {
2610         struct ceph_osd *osd = con->private;
2611         put_osd(osd);
2612 }
2613
2614 /*
2615  * authentication
2616  */
2617 /*
2618  * Note: returned pointer is the address of a structure that's
2619  * managed separately.  Caller must *not* attempt to free it.
2620  */
2621 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2622                                         int *proto, int force_new)
2623 {
2624         struct ceph_osd *o = con->private;
2625         struct ceph_osd_client *osdc = o->o_osdc;
2626         struct ceph_auth_client *ac = osdc->client->monc.auth;
2627         struct ceph_auth_handshake *auth = &o->o_auth;
2628
2629         if (force_new && auth->authorizer) {
2630                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2631                 auth->authorizer = NULL;
2632         }
2633         if (!auth->authorizer) {
2634                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2635                                                       auth);
2636                 if (ret)
2637                         return ERR_PTR(ret);
2638         } else {
2639                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2640                                                      auth);
2641                 if (ret)
2642                         return ERR_PTR(ret);
2643         }
2644         *proto = ac->protocol;
2645
2646         return auth;
2647 }
2648
2649
2650 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2651 {
2652         struct ceph_osd *o = con->private;
2653         struct ceph_osd_client *osdc = o->o_osdc;
2654         struct ceph_auth_client *ac = osdc->client->monc.auth;
2655
2656         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2657 }
2658
2659 static int invalidate_authorizer(struct ceph_connection *con)
2660 {
2661         struct ceph_osd *o = con->private;
2662         struct ceph_osd_client *osdc = o->o_osdc;
2663         struct ceph_auth_client *ac = osdc->client->monc.auth;
2664
2665         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2666         return ceph_monc_validate_auth(&osdc->client->monc);
2667 }
2668
2669 static const struct ceph_connection_operations osd_con_ops = {
2670         .get = get_osd_con,
2671         .put = put_osd_con,
2672         .dispatch = dispatch,
2673         .get_authorizer = get_authorizer,
2674         .verify_authorizer_reply = verify_authorizer_reply,
2675         .invalidate_authorizer = invalidate_authorizer,
2676         .alloc_msg = alloc_msg,
2677         .fault = osd_reset,
2678 };