net/ceph/osd_client.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3
   4 #include <linux/module.h>
   5 #include <linux/err.h>
   6 #include <linux/highmem.h>
   7 #include <linux/mm.h>
   8 #include <linux/pagemap.h>
   9 #include <linux/slab.h>
  10 #include <linux/uaccess.h>
  11 #ifdef CONFIG_BLOCK
  12 #include <linux/bio.h>
  13 #endif
  14
  15 #include <linux/ceph/libceph.h>
  16 #include <linux/ceph/osd_client.h>
  17 #include <linux/ceph/messenger.h>
  18 #include <linux/ceph/decode.h>
  19 #include <linux/ceph/auth.h>
  20 #include <linux/ceph/pagelist.h>
  21
  22 #define OSD_OP_FRONT_LEN        4096
  23 #define OSD_OPREPLY_FRONT_LEN   512
  24
  25 static struct kmem_cache        *ceph_osd_request_cache;
  26
  27 static const struct ceph_connection_operations osd_con_ops;
  28
  29 static void __send_queued(struct ceph_osd_client *osdc);
  30 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  31 static void __register_request(struct ceph_osd_client *osdc,
  32                                struct ceph_osd_request *req);
  33 static void __unregister_request(struct ceph_osd_client *osdc,
  34                                  struct ceph_osd_request *req);
  35 static void __unregister_linger_request(struct ceph_osd_client *osdc,
  36                                         struct ceph_osd_request *req);
  37 static void __enqueue_request(struct ceph_osd_request *req);
  38 static void __send_request(struct ceph_osd_client *osdc,
  39                            struct ceph_osd_request *req);
  40
  41 /*
  42  * Implement client access to distributed object storage cluster.
  43  *
  44  * All data objects are stored within a cluster/cloud of OSDs, or
  45  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  46  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  47  * remote daemons serving up and coordinating consistent and safe
  48  * access to storage.
  49  *
  50  * Cluster membership and the mapping of data objects onto storage devices
  51  * are described by the osd map.
  52  *
  53  * We keep track of pending OSD requests (read, write), resubmit
  54  * requests to different OSDs when the cluster topology/data layout
  55  * change, or retry the affected requests when the communications
  56  * channel with an OSD is reset.
  57  */
  58
  59 /*
  60  * calculate the mapping of a file extent onto an object, and fill out the
  61  * request accordingly.  shorten extent as necessary if it crosses an
  62  * object boundary.
  63  *
  64  * fill osd op in request message.
  65  */
  66 static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen,
  67                         u64 *objnum, u64 *objoff, u64 *objlen)
  68 {
  69         u64 orig_len = *plen;
  70         int r;
  71
  72         /* object extent? */
  73         r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum,
  74                                           objoff, objlen);
  75         if (r < 0)
  76                 return r;
  77         if (*objlen < orig_len) {
  78                 *plen = *objlen;
  79                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  80                      orig_len - *plen, off, *plen);
  81         }
  82
  83         dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen);
  84
  85         return 0;
  86 }
  87
  88 static void ceph_osd_data_init(struct ceph_osd_data *osd_data)
  89 {
  90         memset(osd_data, 0, sizeof (*osd_data));
  91         osd_data->type = CEPH_OSD_DATA_TYPE_NONE;
  92 }
  93
  94 static void ceph_osd_data_pages_init(struct ceph_osd_data *osd_data,
  95                         struct page **pages, u64 length, u32 alignment,
  96                         bool pages_from_pool, bool own_pages)
  97 {
  98         osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;
  99         osd_data->pages = pages;
 100         osd_data->length = length;
 101         osd_data->alignment = alignment;
 102         osd_data->pages_from_pool = pages_from_pool;
 103         osd_data->own_pages = own_pages;
 104 }
 105
 106 static void ceph_osd_data_pagelist_init(struct ceph_osd_data *osd_data,
 107                         struct ceph_pagelist *pagelist)
 108 {
 109         osd_data->type = CEPH_OSD_DATA_TYPE_PAGELIST;
 110         osd_data->pagelist = pagelist;
 111 }
 112
 113 #ifdef CONFIG_BLOCK
 114 static void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
 115                         struct bio *bio, size_t bio_length)
 116 {
 117         osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
 118         osd_data->bio = bio;
 119         osd_data->bio_length = bio_length;
 120 }
 121 #endif /* CONFIG_BLOCK */
 122
 123 #define osd_req_op_data(oreq, whch, typ, fld)   \
 124         ({                                              \
 125                 BUG_ON(whch >= (oreq)->r_num_ops);      \
 126                 &(oreq)->r_ops[whch].typ.fld;           \
 127         })
 128
 129 static struct ceph_osd_data *
 130 osd_req_op_raw_data_in(struct ceph_osd_request *osd_req, unsigned int which)
 131 {
 132         BUG_ON(which >= osd_req->r_num_ops);
 133
 134         return &osd_req->r_ops[which].raw_data_in;
 135 }
 136
 137 struct ceph_osd_data *
 138 osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
 139                         unsigned int which)
 140 {
 141         return osd_req_op_data(osd_req, which, extent, osd_data);
 142 }
 143 EXPORT_SYMBOL(osd_req_op_extent_osd_data);
 144
 145 struct ceph_osd_data *
 146 osd_req_op_cls_response_data(struct ceph_osd_request *osd_req,
 147                         unsigned int which)
 148 {
 149         return osd_req_op_data(osd_req, which, cls, response_data);
 150 }
 151 EXPORT_SYMBOL(osd_req_op_cls_response_data);    /* ??? */
 152
 153 void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
 154                         unsigned int which, struct page **pages,
 155                         u64 length, u32 alignment,
 156                         bool pages_from_pool, bool own_pages)
 157 {
 158         struct ceph_osd_data *osd_data;
 159
 160         osd_data = osd_req_op_raw_data_in(osd_req, which);
 161         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 162                                 pages_from_pool, own_pages);
 163 }
 164 EXPORT_SYMBOL(osd_req_op_raw_data_in_pages);
 165
 166 void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *osd_req,
 167                         unsigned int which, struct page **pages,
 168                         u64 length, u32 alignment,
 169                         bool pages_from_pool, bool own_pages)
 170 {
 171         struct ceph_osd_data *osd_data;
 172
 173         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
 174         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 175                                 pages_from_pool, own_pages);
 176 }
 177 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pages);
 178
 179 void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *osd_req,
 180                         unsigned int which, struct ceph_pagelist *pagelist)
 181 {
 182         struct ceph_osd_data *osd_data;
 183
 184         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
 185         ceph_osd_data_pagelist_init(osd_data, pagelist);
 186 }
 187 EXPORT_SYMBOL(osd_req_op_extent_osd_data_pagelist);
 188
 189 #ifdef CONFIG_BLOCK
 190 void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *osd_req,
 191                         unsigned int which, struct bio *bio, size_t bio_length)
 192 {
 193         struct ceph_osd_data *osd_data;
 194
 195         osd_data = osd_req_op_data(osd_req, which, extent, osd_data);
 196         ceph_osd_data_bio_init(osd_data, bio, bio_length);
 197 }
 198 EXPORT_SYMBOL(osd_req_op_extent_osd_data_bio);
 199 #endif /* CONFIG_BLOCK */
 200
 201 static void osd_req_op_cls_request_info_pagelist(
 202                         struct ceph_osd_request *osd_req,
 203                         unsigned int which, struct ceph_pagelist *pagelist)
 204 {
 205         struct ceph_osd_data *osd_data;
 206
 207         osd_data = osd_req_op_data(osd_req, which, cls, request_info);
 208         ceph_osd_data_pagelist_init(osd_data, pagelist);
 209 }
 210
 211 void osd_req_op_cls_request_data_pagelist(
 212                         struct ceph_osd_request *osd_req,
 213                         unsigned int which, struct ceph_pagelist *pagelist)
 214 {
 215         struct ceph_osd_data *osd_data;
 216
 217         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
 218         ceph_osd_data_pagelist_init(osd_data, pagelist);
 219 }
 220 EXPORT_SYMBOL(osd_req_op_cls_request_data_pagelist);
 221
 222 void osd_req_op_cls_request_data_pages(struct ceph_osd_request *osd_req,
 223                         unsigned int which, struct page **pages, u64 length,
 224                         u32 alignment, bool pages_from_pool, bool own_pages)
 225 {
 226         struct ceph_osd_data *osd_data;
 227
 228         osd_data = osd_req_op_data(osd_req, which, cls, request_data);
 229         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 230                                 pages_from_pool, own_pages);
 231 }
 232 EXPORT_SYMBOL(osd_req_op_cls_request_data_pages);
 233
 234 void osd_req_op_cls_response_data_pages(struct ceph_osd_request *osd_req,
 235                         unsigned int which, struct page **pages, u64 length,
 236                         u32 alignment, bool pages_from_pool, bool own_pages)
 237 {
 238         struct ceph_osd_data *osd_data;
 239
 240         osd_data = osd_req_op_data(osd_req, which, cls, response_data);
 241         ceph_osd_data_pages_init(osd_data, pages, length, alignment,
 242                                 pages_from_pool, own_pages);
 243 }
 244 EXPORT_SYMBOL(osd_req_op_cls_response_data_pages);
 245
 246 static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
 247 {
 248         switch (osd_data->type) {
 249         case CEPH_OSD_DATA_TYPE_NONE:
 250                 return 0;
 251         case CEPH_OSD_DATA_TYPE_PAGES:
 252                 return osd_data->length;
 253         case CEPH_OSD_DATA_TYPE_PAGELIST:
 254                 return (u64)osd_data->pagelist->length;
 255 #ifdef CONFIG_BLOCK
 256         case CEPH_OSD_DATA_TYPE_BIO:
 257                 return (u64)osd_data->bio_length;
 258 #endif /* CONFIG_BLOCK */
 259         default:
 260                 WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
 261                 return 0;
 262         }
 263 }
 264
 265 static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
 266 {
 267         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES && osd_data->own_pages) {
 268                 int num_pages;
 269
 270                 num_pages = calc_pages_for((u64)osd_data->alignment,
 271                                                 (u64)osd_data->length);
 272                 ceph_release_page_vector(osd_data->pages, num_pages);
 273         }
 274         ceph_osd_data_init(osd_data);
 275 }
 276
 277 static void osd_req_op_data_release(struct ceph_osd_request *osd_req,
 278                         unsigned int which)
 279 {
 280         struct ceph_osd_req_op *op;
 281
 282         BUG_ON(which >= osd_req->r_num_ops);
 283         op = &osd_req->r_ops[which];
 284
 285         switch (op->op) {
 286         case CEPH_OSD_OP_READ:
 287         case CEPH_OSD_OP_WRITE:
 288                 ceph_osd_data_release(&op->extent.osd_data);
 289                 break;
 290         case CEPH_OSD_OP_CALL:
 291                 ceph_osd_data_release(&op->cls.request_info);
 292                 ceph_osd_data_release(&op->cls.request_data);
 293                 ceph_osd_data_release(&op->cls.response_data);
 294                 break;
 295         case CEPH_OSD_OP_SETXATTR:
 296         case CEPH_OSD_OP_CMPXATTR:
 297                 ceph_osd_data_release(&op->xattr.osd_data);
 298                 break;
 299         default:
 300                 break;
 301         }
 302 }
 303
 304 /*
 305  * requests
 306  */
 307 static void ceph_osdc_release_request(struct kref *kref)
 308 {
 309         struct ceph_osd_request *req = container_of(kref,
 310                                             struct ceph_osd_request, r_kref);
 311         unsigned int which;
 312
 313         dout("%s %p (r_request %p r_reply %p)\n", __func__, req,
 314              req->r_request, req->r_reply);
 315         WARN_ON(!RB_EMPTY_NODE(&req->r_node));
 316         WARN_ON(!list_empty(&req->r_req_lru_item));
 317         WARN_ON(!list_empty(&req->r_osd_item));
 318         WARN_ON(!list_empty(&req->r_linger_item));
 319         WARN_ON(!list_empty(&req->r_linger_osd_item));
 320         WARN_ON(req->r_osd);
 321
 322         if (req->r_request)
 323                 ceph_msg_put(req->r_request);
 324         if (req->r_reply) {
 325                 ceph_msg_revoke_incoming(req->r_reply);
 326                 ceph_msg_put(req->r_reply);
 327         }
 328
 329         for (which = 0; which < req->r_num_ops; which++)
 330                 osd_req_op_data_release(req, which);
 331
 332         ceph_put_snap_context(req->r_snapc);
 333         if (req->r_mempool)
 334                 mempool_free(req, req->r_osdc->req_mempool);
 335         else
 336                 kmem_cache_free(ceph_osd_request_cache, req);
 337
 338 }
 339
 340 void ceph_osdc_get_request(struct ceph_osd_request *req)
 341 {
 342         dout("%s %p (was %d)\n", __func__, req,
 343              atomic_read(&req->r_kref.refcount));
 344         kref_get(&req->r_kref);
 345 }
 346 EXPORT_SYMBOL(ceph_osdc_get_request);
 347
 348 void ceph_osdc_put_request(struct ceph_osd_request *req)
 349 {
 350         dout("%s %p (was %d)\n", __func__, req,
 351              atomic_read(&req->r_kref.refcount));
 352         kref_put(&req->r_kref, ceph_osdc_release_request);
 353 }
 354 EXPORT_SYMBOL(ceph_osdc_put_request);
 355
 356 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 357                                                struct ceph_snap_context *snapc,
 358                                                unsigned int num_ops,
 359                                                bool use_mempool,
 360                                                gfp_t gfp_flags)
 361 {
 362         struct ceph_osd_request *req;
 363         struct ceph_msg *msg;
 364         size_t msg_size;
 365
 366         BUILD_BUG_ON(CEPH_OSD_MAX_OP > U16_MAX);
 367         BUG_ON(num_ops > CEPH_OSD_MAX_OP);
 368
 369         msg_size = 4 + 4 + 8 + 8 + 4+8;
 370         msg_size += 2 + 4 + 8 + 4 + 4; /* oloc */
 371         msg_size += 1 + 8 + 4 + 4;     /* pg_t */
 372         msg_size += 4 + CEPH_MAX_OID_NAME_LEN; /* oid */
 373         msg_size += 2 + num_ops*sizeof(struct ceph_osd_op);
 374         msg_size += 8;  /* snapid */
 375         msg_size += 8;  /* snap_seq */
 376         msg_size += 8 * (snapc ? snapc->num_snaps : 0);  /* snaps */
 377         msg_size += 4;
 378
 379         if (use_mempool) {
 380                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 381                 memset(req, 0, sizeof(*req));
 382         } else {
 383                 req = kmem_cache_zalloc(ceph_osd_request_cache, gfp_flags);
 384         }
 385         if (req == NULL)
 386                 return NULL;
 387
 388         req->r_osdc = osdc;
 389         req->r_mempool = use_mempool;
 390         req->r_num_ops = num_ops;
 391
 392         kref_init(&req->r_kref);
 393         init_completion(&req->r_completion);
 394         init_completion(&req->r_safe_completion);
 395         RB_CLEAR_NODE(&req->r_node);
 396         INIT_LIST_HEAD(&req->r_unsafe_item);
 397         INIT_LIST_HEAD(&req->r_linger_item);
 398         INIT_LIST_HEAD(&req->r_linger_osd_item);
 399         INIT_LIST_HEAD(&req->r_req_lru_item);
 400         INIT_LIST_HEAD(&req->r_osd_item);
 401
 402         req->r_base_oloc.pool = -1;
 403         req->r_target_oloc.pool = -1;
 404
 405         /* create reply message */
 406         if (use_mempool)
 407                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 408         else
 409                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 410                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 411         if (!msg) {
 412                 ceph_osdc_put_request(req);
 413                 return NULL;
 414         }
 415         req->r_reply = msg;
 416
 417         /* create request message; allow space for oid */
 418         if (use_mempool)
 419                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 420         else
 421                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 422         if (!msg) {
 423                 ceph_osdc_put_request(req);
 424                 return NULL;
 425         }
 426
 427         memset(msg->front.iov_base, 0, msg->front.iov_len);
 428
 429         req->r_request = msg;
 430
 431         return req;
 432 }
 433 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 434
 435 static bool osd_req_opcode_valid(u16 opcode)
 436 {
 437         switch (opcode) {
 438 #define GENERATE_CASE(op, opcode, str)  case CEPH_OSD_OP_##op: return true;
 439 __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
 440 #undef GENERATE_CASE
 441         default:
 442                 return false;
 443         }
 444 }
 445
 446 /*
 447  * This is an osd op init function for opcodes that have no data or
 448  * other information associated with them.  It also serves as a
 449  * common init routine for all the other init functions, below.
 450  */
 451 static struct ceph_osd_req_op *
 452 _osd_req_op_init(struct ceph_osd_request *osd_req, unsigned int which,
 453                                 u16 opcode)
 454 {
 455         struct ceph_osd_req_op *op;
 456
 457         BUG_ON(which >= osd_req->r_num_ops);
 458         BUG_ON(!osd_req_opcode_valid(opcode));
 459
 460         op = &osd_req->r_ops[which];
 461         memset(op, 0, sizeof (*op));
 462         op->op = opcode;
 463
 464         return op;
 465 }
 466
 467 void osd_req_op_init(struct ceph_osd_request *osd_req,
 468                                 unsigned int which, u16 opcode)
 469 {
 470         (void)_osd_req_op_init(osd_req, which, opcode);
 471 }
 472 EXPORT_SYMBOL(osd_req_op_init);
 473
 474 void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 475                                 unsigned int which, u16 opcode,
 476                                 u64 offset, u64 length,
 477                                 u64 truncate_size, u32 truncate_seq)
 478 {
 479         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 480         size_t payload_len = 0;
 481
 482         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 483                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE);
 484
 485         op->extent.offset = offset;
 486         op->extent.length = length;
 487         op->extent.truncate_size = truncate_size;
 488         op->extent.truncate_seq = truncate_seq;
 489         if (opcode == CEPH_OSD_OP_WRITE)
 490                 payload_len += length;
 491
 492         op->payload_len = payload_len;
 493 }
 494 EXPORT_SYMBOL(osd_req_op_extent_init);
 495
 496 void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 497                                 unsigned int which, u64 length)
 498 {
 499         struct ceph_osd_req_op *op;
 500         u64 previous;
 501
 502         BUG_ON(which >= osd_req->r_num_ops);
 503         op = &osd_req->r_ops[which];
 504         previous = op->extent.length;
 505
 506         if (length == previous)
 507                 return;         /* Nothing to do */
 508         BUG_ON(length > previous);
 509
 510         op->extent.length = length;
 511         op->payload_len -= previous - length;
 512 }
 513 EXPORT_SYMBOL(osd_req_op_extent_update);
 514
 515 void osd_req_op_cls_init(struct ceph_osd_request *osd_req, unsigned int which,
 516                         u16 opcode, const char *class, const char *method)
 517 {
 518         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 519         struct ceph_pagelist *pagelist;
 520         size_t payload_len = 0;
 521         size_t size;
 522
 523         BUG_ON(opcode != CEPH_OSD_OP_CALL);
 524
 525         pagelist = kmalloc(sizeof (*pagelist), GFP_NOFS);
 526         BUG_ON(!pagelist);
 527         ceph_pagelist_init(pagelist);
 528
 529         op->cls.class_name = class;
 530         size = strlen(class);
 531         BUG_ON(size > (size_t) U8_MAX);
 532         op->cls.class_len = size;
 533         ceph_pagelist_append(pagelist, class, size);
 534         payload_len += size;
 535
 536         op->cls.method_name = method;
 537         size = strlen(method);
 538         BUG_ON(size > (size_t) U8_MAX);
 539         op->cls.method_len = size;
 540         ceph_pagelist_append(pagelist, method, size);
 541         payload_len += size;
 542
 543         osd_req_op_cls_request_info_pagelist(osd_req, which, pagelist);
 544
 545         op->cls.argc = 0;       /* currently unused */
 546
 547         op->payload_len = payload_len;
 548 }
 549 EXPORT_SYMBOL(osd_req_op_cls_init);
 550
 551 int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
 552                           u16 opcode, const char *name, const void *value,
 553                           size_t size, u8 cmp_op, u8 cmp_mode)
 554 {
 555         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 556         struct ceph_pagelist *pagelist;
 557         size_t payload_len;
 558
 559         BUG_ON(opcode != CEPH_OSD_OP_SETXATTR && opcode != CEPH_OSD_OP_CMPXATTR);
 560
 561         pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
 562         if (!pagelist)
 563                 return -ENOMEM;
 564
 565         ceph_pagelist_init(pagelist);
 566
 567         payload_len = strlen(name);
 568         op->xattr.name_len = payload_len;
 569         ceph_pagelist_append(pagelist, name, payload_len);
 570
 571         op->xattr.value_len = size;
 572         ceph_pagelist_append(pagelist, value, size);
 573         payload_len += size;
 574
 575         op->xattr.cmp_op = cmp_op;
 576         op->xattr.cmp_mode = cmp_mode;
 577
 578         ceph_osd_data_pagelist_init(&op->xattr.osd_data, pagelist);
 579         op->payload_len = payload_len;
 580         return 0;
 581 }
 582 EXPORT_SYMBOL(osd_req_op_xattr_init);
 583
 584 void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 585                                 unsigned int which, u16 opcode,
 586                                 u64 cookie, u64 version, int flag)
 587 {
 588         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
 589
 590         BUG_ON(opcode != CEPH_OSD_OP_NOTIFY_ACK && opcode != CEPH_OSD_OP_WATCH);
 591
 592         op->watch.cookie = cookie;
 593         op->watch.ver = version;
 594         if (opcode == CEPH_OSD_OP_WATCH && flag)
 595                 op->watch.flag = (u8)1;
 596 }
 597 EXPORT_SYMBOL(osd_req_op_watch_init);
 598
 599 void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
 600                                 unsigned int which,
 601                                 u64 expected_object_size,
 602                                 u64 expected_write_size)
 603 {
 604         struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
 605                                                       CEPH_OSD_OP_SETALLOCHINT);
 606
 607         op->alloc_hint.expected_object_size = expected_object_size;
 608         op->alloc_hint.expected_write_size = expected_write_size;
 609
 610         /*
 611          * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
 612          * not worth a feature bit.  Set FAILOK per-op flag to make
 613          * sure older osds don't trip over an unsupported opcode.
 614          */
 615         op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
 616 }
 617 EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
 618
 619 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 620                                 struct ceph_osd_data *osd_data)
 621 {
 622         u64 length = ceph_osd_data_length(osd_data);
 623
 624         if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
 625                 BUG_ON(length > (u64) SIZE_MAX);
 626                 if (length)
 627                         ceph_msg_data_add_pages(msg, osd_data->pages,
 628                                         length, osd_data->alignment);
 629         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
 630                 BUG_ON(!length);
 631                 ceph_msg_data_add_pagelist(msg, osd_data->pagelist);
 632 #ifdef CONFIG_BLOCK
 633         } else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
 634                 ceph_msg_data_add_bio(msg, osd_data->bio, length);
 635 #endif
 636         } else {
 637                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);
 638         }
 639 }
 640
 641 static u64 osd_req_encode_op(struct ceph_osd_request *req,
 642                               struct ceph_osd_op *dst, unsigned int which)
 643 {
 644         struct ceph_osd_req_op *src;
 645         struct ceph_osd_data *osd_data;
 646         u64 request_data_len = 0;
 647         u64 data_length;
 648
 649         BUG_ON(which >= req->r_num_ops);
 650         src = &req->r_ops[which];
 651         if (WARN_ON(!osd_req_opcode_valid(src->op))) {
 652                 pr_err("unrecognized osd opcode %d\n", src->op);
 653
 654                 return 0;
 655         }
 656
 657         switch (src->op) {
 658         case CEPH_OSD_OP_STAT:
 659                 osd_data = &src->raw_data_in;
 660                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 661                 break;
 662         case CEPH_OSD_OP_READ:
 663         case CEPH_OSD_OP_WRITE:
 664         case CEPH_OSD_OP_ZERO:
 665         case CEPH_OSD_OP_TRUNCATE:
 666                 if (src->op == CEPH_OSD_OP_WRITE)
 667                         request_data_len = src->extent.length;
 668                 dst->extent.offset = cpu_to_le64(src->extent.offset);
 669                 dst->extent.length = cpu_to_le64(src->extent.length);
 670                 dst->extent.truncate_size =
 671                         cpu_to_le64(src->extent.truncate_size);
 672                 dst->extent.truncate_seq =
 673                         cpu_to_le32(src->extent.truncate_seq);
 674                 osd_data = &src->extent.osd_data;
 675                 if (src->op == CEPH_OSD_OP_WRITE)
 676                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 677                 else
 678                         ceph_osdc_msg_data_add(req->r_reply, osd_data);
 679                 break;
 680         case CEPH_OSD_OP_CALL:
 681                 dst->cls.class_len = src->cls.class_len;
 682                 dst->cls.method_len = src->cls.method_len;
 683                 osd_data = &src->cls.request_info;
 684                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 685                 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGELIST);
 686                 request_data_len = osd_data->pagelist->length;
 687
 688                 osd_data = &src->cls.request_data;
 689                 data_length = ceph_osd_data_length(osd_data);
 690                 if (data_length) {
 691                         BUG_ON(osd_data->type == CEPH_OSD_DATA_TYPE_NONE);
 692                         dst->cls.indata_len = cpu_to_le32(data_length);
 693                         ceph_osdc_msg_data_add(req->r_request, osd_data);
 694                         src->payload_len += data_length;
 695                         request_data_len += data_length;
 696                 }
 697                 osd_data = &src->cls.response_data;
 698                 ceph_osdc_msg_data_add(req->r_reply, osd_data);
 699                 break;
 700         case CEPH_OSD_OP_STARTSYNC:
 701                 break;
 702         case CEPH_OSD_OP_NOTIFY_ACK:
 703         case CEPH_OSD_OP_WATCH:
 704                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 705                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 706                 dst->watch.flag = src->watch.flag;
 707                 break;
 708         case CEPH_OSD_OP_SETALLOCHINT:
 709                 dst->alloc_hint.expected_object_size =
 710                     cpu_to_le64(src->alloc_hint.expected_object_size);
 711                 dst->alloc_hint.expected_write_size =
 712                     cpu_to_le64(src->alloc_hint.expected_write_size);
 713                 break;
 714         case CEPH_OSD_OP_SETXATTR:
 715         case CEPH_OSD_OP_CMPXATTR:
 716                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 717                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 718                 dst->xattr.cmp_op = src->xattr.cmp_op;
 719                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
 720                 osd_data = &src->xattr.osd_data;
 721                 ceph_osdc_msg_data_add(req->r_request, osd_data);
 722                 request_data_len = osd_data->pagelist->length;
 723                 break;
 724         case CEPH_OSD_OP_CREATE:
 725         case CEPH_OSD_OP_DELETE:
 726                 break;
 727         default:
 728                 pr_err("unsupported osd opcode %s\n",
 729                         ceph_osd_op_name(src->op));
 730                 WARN_ON(1);
 731
 732                 return 0;
 733         }
 734
 735         dst->op = cpu_to_le16(src->op);
 736         dst->flags = cpu_to_le32(src->flags);
 737         dst->payload_len = cpu_to_le32(src->payload_len);
 738
 739         return request_data_len;
 740 }
 741
 742 /*
 743  * build new request AND message, calculate layout, and adjust file
 744  * extent as needed.
 745  *
 746  * if the file was recently truncated, we include information about its
 747  * old and new size so that the object can be updated appropriately.  (we
 748  * avoid synchronously deleting truncated objects because it's slow.)
 749  *
 750  * if @do_sync, include a 'startsync' command so that the osd will flush
 751  * data quickly.
 752  */
 753 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 754                                                struct ceph_file_layout *layout,
 755                                                struct ceph_vino vino,
 756                                                u64 off, u64 *plen,
 757                                                unsigned int which, int num_ops,
 758                                                int opcode, int flags,
 759                                                struct ceph_snap_context *snapc,
 760                                                u32 truncate_seq,
 761                                                u64 truncate_size,
 762                                                bool use_mempool)
 763 {
 764         struct ceph_osd_request *req;
 765         u64 objnum = 0;
 766         u64 objoff = 0;
 767         u64 objlen = 0;
 768         int r;
 769
 770         BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
 771                opcode != CEPH_OSD_OP_ZERO && opcode != CEPH_OSD_OP_TRUNCATE &&
 772                opcode != CEPH_OSD_OP_CREATE && opcode != CEPH_OSD_OP_DELETE);
 773
 774         req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
 775                                         GFP_NOFS);
 776         if (!req)
 777                 return ERR_PTR(-ENOMEM);
 778
 779         req->r_flags = flags;
 780
 781         /* calculate max write size */
 782         r = calc_layout(layout, off, plen, &objnum, &objoff, &objlen);
 783         if (r < 0) {
 784                 ceph_osdc_put_request(req);
 785                 return ERR_PTR(r);
 786         }
 787
 788         if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
 789                 osd_req_op_init(req, which, opcode);
 790         } else {
 791                 u32 object_size = le32_to_cpu(layout->fl_object_size);
 792                 u32 object_base = off - objoff;
 793                 if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
 794                         if (truncate_size <= object_base) {
 795                                 truncate_size = 0;
 796                         } else {
 797                                 truncate_size -= object_base;
 798                                 if (truncate_size > object_size)
 799                                         truncate_size = object_size;
 800                         }
 801                 }
 802                 osd_req_op_extent_init(req, which, opcode, objoff, objlen,
 803                                        truncate_size, truncate_seq);
 804         }
 805
 806         req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
 807
 808         snprintf(req->r_base_oid.name, sizeof(req->r_base_oid.name),
 809                  "%llx.%08llx", vino.ino, objnum);
 810         req->r_base_oid.name_len = strlen(req->r_base_oid.name);
 811
 812         return req;
 813 }
 814 EXPORT_SYMBOL(ceph_osdc_new_request);
 815
 816 /*
 817  * We keep osd requests in an rbtree, sorted by ->r_tid.
 818  */
 819 static void __insert_request(struct ceph_osd_client *osdc,
 820                              struct ceph_osd_request *new)
 821 {
 822         struct rb_node **p = &osdc->requests.rb_node;
 823         struct rb_node *parent = NULL;
 824         struct ceph_osd_request *req = NULL;
 825
 826         while (*p) {
 827                 parent = *p;
 828                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 829                 if (new->r_tid < req->r_tid)
 830                         p = &(*p)->rb_left;
 831                 else if (new->r_tid > req->r_tid)
 832                         p = &(*p)->rb_right;
 833                 else
 834                         BUG();
 835         }
 836
 837         rb_link_node(&new->r_node, parent, p);
 838         rb_insert_color(&new->r_node, &osdc->requests);
 839 }
 840
 841 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 842                                                  u64 tid)
 843 {
 844         struct ceph_osd_request *req;
 845         struct rb_node *n = osdc->requests.rb_node;
 846
 847         while (n) {
 848                 req = rb_entry(n, struct ceph_osd_request, r_node);
 849                 if (tid < req->r_tid)
 850                         n = n->rb_left;
 851                 else if (tid > req->r_tid)
 852                         n = n->rb_right;
 853                 else
 854                         return req;
 855         }
 856         return NULL;
 857 }
 858
 859 static struct ceph_osd_request *
 860 __lookup_request_ge(struct ceph_osd_client *osdc,
 861                     u64 tid)
 862 {
 863         struct ceph_osd_request *req;
 864         struct rb_node *n = osdc->requests.rb_node;
 865
 866         while (n) {
 867                 req = rb_entry(n, struct ceph_osd_request, r_node);
 868                 if (tid < req->r_tid) {
 869                         if (!n->rb_left)
 870                                 return req;
 871                         n = n->rb_left;
 872                 } else if (tid > req->r_tid) {
 873                         n = n->rb_right;
 874                 } else {
 875                         return req;
 876                 }
 877         }
 878         return NULL;
 879 }
 880
 881 static void __kick_linger_request(struct ceph_osd_request *req)
 882 {
 883         struct ceph_osd_client *osdc = req->r_osdc;
 884         struct ceph_osd *osd = req->r_osd;
 885
 886         /*
 887          * Linger requests need to be resent with a new tid to avoid
 888          * the dup op detection logic on the OSDs.  Achieve this with
 889          * a re-register dance instead of open-coding.
 890          */
 891         ceph_osdc_get_request(req);
 892         if (!list_empty(&req->r_linger_item))
 893                 __unregister_linger_request(osdc, req);
 894         else
 895                 __unregister_request(osdc, req);
 896         __register_request(osdc, req);
 897         ceph_osdc_put_request(req);
 898
 899         /*
 900          * Unless request has been registered as both normal and
 901          * lingering, __unregister{,_linger}_request clears r_osd.
 902          * However, here we need to preserve r_osd to make sure we
 903          * requeue on the same OSD.
 904          */
 905         WARN_ON(req->r_osd || !osd);
 906         req->r_osd = osd;
 907
 908         dout("%s requeueing %p tid %llu\n", __func__, req, req->r_tid);
 909         __enqueue_request(req);
 910 }
 911
 912 /*
 913  * Resubmit requests pending on the given osd.
 914  */
 915 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 916                                 struct ceph_osd *osd)
 917 {
 918         struct ceph_osd_request *req, *nreq;
 919         LIST_HEAD(resend);
 920         LIST_HEAD(resend_linger);
 921         int err;
 922
 923         dout("%s osd%d\n", __func__, osd->o_osd);
 924         err = __reset_osd(osdc, osd);
 925         if (err)
 926                 return;
 927
 928         /*
 929          * Build up a list of requests to resend by traversing the
 930          * osd's list of requests.  Requests for a given object are
 931          * sent in tid order, and that is also the order they're
 932          * kept on this list.  Therefore all requests that are in
 933          * flight will be found first, followed by all requests that
 934          * have not yet been sent.  And to resend requests while
 935          * preserving this order we will want to put any sent
 936          * requests back on the front of the osd client's unsent
 937          * list.
 938          *
 939          * So we build a separate ordered list of already-sent
 940          * requests for the affected osd and splice it onto the
 941          * front of the osd client's unsent list.  Once we've seen a
 942          * request that has not yet been sent we're done.  Those
 943          * requests are already sitting right where they belong.
 944          */
 945         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 946                 if (!req->r_sent)
 947                         break;
 948
 949                 if (!req->r_linger) {
 950                         dout("%s requeueing %p tid %llu\n", __func__, req,
 951                              req->r_tid);
 952                         list_move_tail(&req->r_req_lru_item, &resend);
 953                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 954                 } else {
 955                         list_move_tail(&req->r_req_lru_item, &resend_linger);
 956                 }
 957         }
 958         list_splice(&resend, &osdc->req_unsent);
 959
 960         /*
 961          * Both registered and not yet registered linger requests are
 962          * enqueued with a new tid on the same OSD.  We add/move them
 963          * to req_unsent/o_requests at the end to keep things in tid
 964          * order.
 965          */
 966         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 967                                  r_linger_osd_item) {
 968                 WARN_ON(!list_empty(&req->r_req_lru_item));
 969                 __kick_linger_request(req);
 970         }
 971
 972         list_for_each_entry_safe(req, nreq, &resend_linger, r_req_lru_item)
 973                 __kick_linger_request(req);
 974 }
 975
 976 /*
 977  * If the osd connection drops, we need to resubmit all requests.
 978  */
 979 static void osd_reset(struct ceph_connection *con)
 980 {
 981         struct ceph_osd *osd = con->private;
 982         struct ceph_osd_client *osdc;
 983
 984         if (!osd)
 985                 return;
 986         dout("osd_reset osd%d\n", osd->o_osd);
 987         osdc = osd->o_osdc;
 988         down_read(&osdc->map_sem);
 989         mutex_lock(&osdc->request_mutex);
 990         __kick_osd_requests(osdc, osd);
 991         __send_queued(osdc);
 992         mutex_unlock(&osdc->request_mutex);
 993         up_read(&osdc->map_sem);
 994 }
 995
 996 /*
 997  * Track open sessions with osds.
 998  */
 999 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
1000 {
1001         struct ceph_osd *osd;
1002
1003         osd = kzalloc(sizeof(*osd), GFP_NOFS);
1004         if (!osd)
1005                 return NULL;
1006
1007         atomic_set(&osd->o_ref, 1);
1008         osd->o_osdc = osdc;
1009         osd->o_osd = onum;
1010         RB_CLEAR_NODE(&osd->o_node);
1011         INIT_LIST_HEAD(&osd->o_requests);
1012         INIT_LIST_HEAD(&osd->o_linger_requests);
1013         INIT_LIST_HEAD(&osd->o_osd_lru);
1014         osd->o_incarnation = 1;
1015
1016         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
1017
1018         INIT_LIST_HEAD(&osd->o_keepalive_item);
1019         return osd;
1020 }
1021
1022 static struct ceph_osd *get_osd(struct ceph_osd *osd)
1023 {
1024         if (atomic_inc_not_zero(&osd->o_ref)) {
1025                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
1026                      atomic_read(&osd->o_ref));
1027                 return osd;
1028         } else {
1029                 dout("get_osd %p FAIL\n", osd);
1030                 return NULL;
1031         }
1032 }
1033
1034 static void put_osd(struct ceph_osd *osd)
1035 {
1036         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
1037              atomic_read(&osd->o_ref) - 1);
1038         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
1039                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
1040
1041                 ceph_auth_destroy_authorizer(ac, osd->o_auth.authorizer);
1042                 kfree(osd);
1043         }
1044 }
1045
1046 /*
1047  * remove an osd from our map
1048  */
1049 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1050 {
1051         dout("__remove_osd %p\n", osd);
1052         WARN_ON(!list_empty(&osd->o_requests));
1053         WARN_ON(!list_empty(&osd->o_linger_requests));
1054
1055         rb_erase(&osd->o_node, &osdc->osds);
1056         list_del_init(&osd->o_osd_lru);
1057         ceph_con_close(&osd->o_con);
1058         put_osd(osd);
1059 }
1060
1061 static void remove_all_osds(struct ceph_osd_client *osdc)
1062 {
1063         dout("%s %p\n", __func__, osdc);
1064         mutex_lock(&osdc->request_mutex);
1065         while (!RB_EMPTY_ROOT(&osdc->osds)) {
1066                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
1067                                                 struct ceph_osd, o_node);
1068                 __remove_osd(osdc, osd);
1069         }
1070         mutex_unlock(&osdc->request_mutex);
1071 }
1072
1073 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
1074                               struct ceph_osd *osd)
1075 {
1076         dout("%s %p\n", __func__, osd);
1077         BUG_ON(!list_empty(&osd->o_osd_lru));
1078
1079         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
1080         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
1081 }
1082
1083 static void maybe_move_osd_to_lru(struct ceph_osd_client *osdc,
1084                                   struct ceph_osd *osd)
1085 {
1086         dout("%s %p\n", __func__, osd);
1087
1088         if (list_empty(&osd->o_requests) &&
1089             list_empty(&osd->o_linger_requests))
1090                 __move_osd_to_lru(osdc, osd);
1091 }
1092
1093 static void __remove_osd_from_lru(struct ceph_osd *osd)
1094 {
1095         dout("__remove_osd_from_lru %p\n", osd);
1096         if (!list_empty(&osd->o_osd_lru))
1097                 list_del_init(&osd->o_osd_lru);
1098 }
1099
1100 static void remove_old_osds(struct ceph_osd_client *osdc)
1101 {
1102         struct ceph_osd *osd, *nosd;
1103
1104         dout("__remove_old_osds %p\n", osdc);
1105         mutex_lock(&osdc->request_mutex);
1106         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
1107                 if (time_before(jiffies, osd->lru_ttl))
1108                         break;
1109                 __remove_osd(osdc, osd);
1110         }
1111         mutex_unlock(&osdc->request_mutex);
1112 }
1113
1114 /*
1115  * reset osd connect
1116  */
1117 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
1118 {
1119         struct ceph_entity_addr *peer_addr;
1120
1121         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
1122         if (list_empty(&osd->o_requests) &&
1123             list_empty(&osd->o_linger_requests)) {
1124                 __remove_osd(osdc, osd);
1125
1126                 return -ENODEV;
1127         }
1128
1129         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
1130         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
1131                         !ceph_con_opened(&osd->o_con)) {
1132                 struct ceph_osd_request *req;
1133
1134                 dout("osd addr hasn't changed and connection never opened, "
1135                      "letting msgr retry\n");
1136                 /* touch each r_stamp for handle_timeout()'s benfit */
1137                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
1138                         req->r_stamp = jiffies;
1139
1140                 return -EAGAIN;
1141         }
1142
1143         ceph_con_close(&osd->o_con);
1144         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
1145         osd->o_incarnation++;
1146
1147         return 0;
1148 }
1149
1150 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
1151 {
1152         struct rb_node **p = &osdc->osds.rb_node;
1153         struct rb_node *parent = NULL;
1154         struct ceph_osd *osd = NULL;
1155
1156         dout("__insert_osd %p osd%d\n", new, new->o_osd);
1157         while (*p) {
1158                 parent = *p;
1159                 osd = rb_entry(parent, struct ceph_osd, o_node);
1160                 if (new->o_osd < osd->o_osd)
1161                         p = &(*p)->rb_left;
1162                 else if (new->o_osd > osd->o_osd)
1163                         p = &(*p)->rb_right;
1164                 else
1165                         BUG();
1166         }
1167
1168         rb_link_node(&new->o_node, parent, p);
1169         rb_insert_color(&new->o_node, &osdc->osds);
1170 }
1171
1172 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
1173 {
1174         struct ceph_osd *osd;
1175         struct rb_node *n = osdc->osds.rb_node;
1176
1177         while (n) {
1178                 osd = rb_entry(n, struct ceph_osd, o_node);
1179                 if (o < osd->o_osd)
1180                         n = n->rb_left;
1181                 else if (o > osd->o_osd)
1182                         n = n->rb_right;
1183                 else
1184                         return osd;
1185         }
1186         return NULL;
1187 }
1188
1189 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
1190 {
1191         schedule_delayed_work(&osdc->timeout_work,
1192                         osdc->client->options->osd_keepalive_timeout * HZ);
1193 }
1194
1195 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
1196 {
1197         cancel_delayed_work(&osdc->timeout_work);
1198 }
1199
1200 /*
1201  * Register request, assign tid.  If this is the first request, set up
1202  * the timeout event.
1203  */
1204 static void __register_request(struct ceph_osd_client *osdc,
1205                                struct ceph_osd_request *req)
1206 {
1207         req->r_tid = ++osdc->last_tid;
1208         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
1209         dout("__register_request %p tid %lld\n", req, req->r_tid);
1210         __insert_request(osdc, req);
1211         ceph_osdc_get_request(req);
1212         osdc->num_requests++;
1213         if (osdc->num_requests == 1) {
1214                 dout(" first request, scheduling timeout\n");
1215                 __schedule_osd_timeout(osdc);
1216         }
1217 }
1218
1219 /*
1220  * called under osdc->request_mutex
1221  */
1222 static void __unregister_request(struct ceph_osd_client *osdc,
1223                                  struct ceph_osd_request *req)
1224 {
1225         if (RB_EMPTY_NODE(&req->r_node)) {
1226                 dout("__unregister_request %p tid %lld not registered\n",
1227                         req, req->r_tid);
1228                 return;
1229         }
1230
1231         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1232         rb_erase(&req->r_node, &osdc->requests);
1233         RB_CLEAR_NODE(&req->r_node);
1234         osdc->num_requests--;
1235
1236         if (req->r_osd) {
1237                 /* make sure the original request isn't in flight. */
1238                 ceph_msg_revoke(req->r_request);
1239
1240                 list_del_init(&req->r_osd_item);
1241                 maybe_move_osd_to_lru(osdc, req->r_osd);
1242                 if (list_empty(&req->r_linger_osd_item))
1243                         req->r_osd = NULL;
1244         }
1245
1246         list_del_init(&req->r_req_lru_item);
1247         ceph_osdc_put_request(req);
1248
1249         if (osdc->num_requests == 0) {
1250                 dout(" no requests, canceling timeout\n");
1251                 __cancel_osd_timeout(osdc);
1252         }
1253 }
1254
1255 /*
1256  * Cancel a previously queued request message
1257  */
1258 static void __cancel_request(struct ceph_osd_request *req)
1259 {
1260         if (req->r_sent && req->r_osd) {
1261                 ceph_msg_revoke(req->r_request);
1262                 req->r_sent = 0;
1263         }
1264 }
1265
1266 static void __register_linger_request(struct ceph_osd_client *osdc,
1267                                     struct ceph_osd_request *req)
1268 {
1269         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1270         WARN_ON(!req->r_linger);
1271
1272         ceph_osdc_get_request(req);
1273         list_add_tail(&req->r_linger_item, &osdc->req_linger);
1274         if (req->r_osd)
1275                 list_add_tail(&req->r_linger_osd_item,
1276                               &req->r_osd->o_linger_requests);
1277 }
1278
1279 static void __unregister_linger_request(struct ceph_osd_client *osdc,
1280                                         struct ceph_osd_request *req)
1281 {
1282         WARN_ON(!req->r_linger);
1283
1284         if (list_empty(&req->r_linger_item)) {
1285                 dout("%s %p tid %llu not registered\n", __func__, req,
1286                      req->r_tid);
1287                 return;
1288         }
1289
1290         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
1291         list_del_init(&req->r_linger_item);
1292
1293         if (req->r_osd) {
1294                 list_del_init(&req->r_linger_osd_item);
1295                 maybe_move_osd_to_lru(osdc, req->r_osd);
1296                 if (list_empty(&req->r_osd_item))
1297                         req->r_osd = NULL;
1298         }
1299
1300         list_del_init(&req->r_req_lru_item); /* can be on notarget */
1301         ceph_osdc_put_request(req);
1302 }
1303
1304 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
1305                                   struct ceph_osd_request *req)
1306 {
1307         if (!req->r_linger) {
1308                 dout("set_request_linger %p\n", req);
1309                 req->r_linger = 1;
1310         }
1311 }
1312 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
1313
1314 /*
1315  * Returns whether a request should be blocked from being sent
1316  * based on the current osdmap and osd_client settings.
1317  *
1318  * Caller should hold map_sem for read.
1319  */
1320 static bool __req_should_be_paused(struct ceph_osd_client *osdc,
1321                                    struct ceph_osd_request *req)
1322 {
1323         bool pauserd = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD);
1324         bool pausewr = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR) ||
1325                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
1326         return (req->r_flags & CEPH_OSD_FLAG_READ && pauserd) ||
1327                 (req->r_flags & CEPH_OSD_FLAG_WRITE && pausewr);
1328 }
1329
1330 /*
1331  * Calculate mapping of a request to a PG.  Takes tiering into account.
1332  */
1333 static int __calc_request_pg(struct ceph_osdmap *osdmap,
1334                              struct ceph_osd_request *req,
1335                              struct ceph_pg *pg_out)
1336 {
1337         bool need_check_tiering;
1338
1339         need_check_tiering = false;
1340         if (req->r_target_oloc.pool == -1) {
1341                 req->r_target_oloc = req->r_base_oloc; /* struct */
1342                 need_check_tiering = true;
1343         }
1344         if (req->r_target_oid.name_len == 0) {
1345                 ceph_oid_copy(&req->r_target_oid, &req->r_base_oid);
1346                 need_check_tiering = true;
1347         }
1348
1349         if (need_check_tiering &&
1350             (req->r_flags & CEPH_OSD_FLAG_IGNORE_OVERLAY) == 0) {
1351                 struct ceph_pg_pool_info *pi;
1352
1353                 pi = ceph_pg_pool_by_id(osdmap, req->r_target_oloc.pool);
1354                 if (pi) {
1355                         if ((req->r_flags & CEPH_OSD_FLAG_READ) &&
1356                             pi->read_tier >= 0)
1357                                 req->r_target_oloc.pool = pi->read_tier;
1358                         if ((req->r_flags & CEPH_OSD_FLAG_WRITE) &&
1359                             pi->write_tier >= 0)
1360                                 req->r_target_oloc.pool = pi->write_tier;
1361                 }
1362                 /* !pi is caught in ceph_oloc_oid_to_pg() */
1363         }
1364
1365         return ceph_oloc_oid_to_pg(osdmap, &req->r_target_oloc,
1366                                    &req->r_target_oid, pg_out);
1367 }
1368
1369 static void __enqueue_request(struct ceph_osd_request *req)
1370 {
1371         struct ceph_osd_client *osdc = req->r_osdc;
1372
1373         dout("%s %p tid %llu to osd%d\n", __func__, req, req->r_tid,
1374              req->r_osd ? req->r_osd->o_osd : -1);
1375
1376         if (req->r_osd) {
1377                 __remove_osd_from_lru(req->r_osd);
1378                 list_add_tail(&req->r_osd_item, &req->r_osd->o_requests);
1379                 list_move_tail(&req->r_req_lru_item, &osdc->req_unsent);
1380         } else {
1381                 list_move_tail(&req->r_req_lru_item, &osdc->req_notarget);
1382         }
1383 }
1384
1385 /*
1386  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
1387  * (as needed), and set the request r_osd appropriately.  If there is
1388  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
1389  * (unsent, homeless) or leave on in-flight lru.
1390  *
1391  * Return 0 if unchanged, 1 if changed, or negative on error.
1392  *
1393  * Caller should hold map_sem for read and request_mutex.
1394  */
1395 static int __map_request(struct ceph_osd_client *osdc,
1396                          struct ceph_osd_request *req, int force_resend)
1397 {
1398         struct ceph_pg pgid;
1399         int acting[CEPH_PG_MAX_SIZE];
1400         int num, o;
1401         int err;
1402         bool was_paused;
1403
1404         dout("map_request %p tid %lld\n", req, req->r_tid);
1405
1406         err = __calc_request_pg(osdc->osdmap, req, &pgid);
1407         if (err) {
1408                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
1409                 return err;
1410         }
1411         req->r_pgid = pgid;
1412
1413         num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
1414         if (num < 0)
1415                 num = 0;
1416
1417         was_paused = req->r_paused;
1418         req->r_paused = __req_should_be_paused(osdc, req);
1419         if (was_paused && !req->r_paused)
1420                 force_resend = 1;
1421
1422         if ((!force_resend &&
1423              req->r_osd && req->r_osd->o_osd == o &&
1424              req->r_sent >= req->r_osd->o_incarnation &&
1425              req->r_num_pg_osds == num &&
1426              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
1427             (req->r_osd == NULL && o == -1) ||
1428             req->r_paused)
1429                 return 0;  /* no change */
1430
1431         dout("map_request tid %llu pgid %lld.%x osd%d (was osd%d)\n",
1432              req->r_tid, pgid.pool, pgid.seed, o,
1433              req->r_osd ? req->r_osd->o_osd : -1);
1434
1435         /* record full pg acting set */
1436         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
1437         req->r_num_pg_osds = num;
1438
1439         if (req->r_osd) {
1440                 __cancel_request(req);
1441                 list_del_init(&req->r_osd_item);
1442                 list_del_init(&req->r_linger_osd_item);
1443                 req->r_osd = NULL;
1444         }
1445
1446         req->r_osd = __lookup_osd(osdc, o);
1447         if (!req->r_osd && o >= 0) {
1448                 err = -ENOMEM;
1449                 req->r_osd = create_osd(osdc, o);
1450                 if (!req->r_osd) {
1451                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
1452                         goto out;
1453                 }
1454
1455                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
1456                 __insert_osd(osdc, req->r_osd);
1457
1458                 ceph_con_open(&req->r_osd->o_con,
1459                               CEPH_ENTITY_TYPE_OSD, o,
1460                               &osdc->osdmap->osd_addr[o]);
1461         }
1462
1463         __enqueue_request(req);
1464         err = 1;   /* osd or pg changed */
1465
1466 out:
1467         return err;
1468 }
1469
1470 /*
1471  * caller should hold map_sem (for read) and request_mutex
1472  */
1473 static void __send_request(struct ceph_osd_client *osdc,
1474                            struct ceph_osd_request *req)
1475 {
1476         void *p;
1477
1478         dout("send_request %p tid %llu to osd%d flags %d pg %lld.%x\n",
1479              req, req->r_tid, req->r_osd->o_osd, req->r_flags,
1480              (unsigned long long)req->r_pgid.pool, req->r_pgid.seed);
1481
1482         /* fill in message content that changes each time we send it */
1483         put_unaligned_le32(osdc->osdmap->epoch, req->r_request_osdmap_epoch);
1484         put_unaligned_le32(req->r_flags, req->r_request_flags);
1485         put_unaligned_le64(req->r_target_oloc.pool, req->r_request_pool);
1486         p = req->r_request_pgid;
1487         ceph_encode_64(&p, req->r_pgid.pool);
1488         ceph_encode_32(&p, req->r_pgid.seed);
1489         put_unaligned_le64(1, req->r_request_attempts);  /* FIXME */
1490         memcpy(req->r_request_reassert_version, &req->r_reassert_version,
1491                sizeof(req->r_reassert_version));
1492
1493         req->r_stamp = jiffies;
1494         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
1495
1496         ceph_msg_get(req->r_request); /* send consumes a ref */
1497
1498         req->r_sent = req->r_osd->o_incarnation;
1499
1500         ceph_con_send(&req->r_osd->o_con, req->r_request);
1501 }
1502
1503 /*
1504  * Send any requests in the queue (req_unsent).
1505  */
1506 static void __send_queued(struct ceph_osd_client *osdc)
1507 {
1508         struct ceph_osd_request *req, *tmp;
1509
1510         dout("__send_queued\n");
1511         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item)
1512                 __send_request(osdc, req);
1513 }
1514
1515 /*
1516  * Caller should hold map_sem for read and request_mutex.
1517  */
1518 static int __ceph_osdc_start_request(struct ceph_osd_client *osdc,
1519                                      struct ceph_osd_request *req,
1520                                      bool nofail)
1521 {
1522         int rc;
1523
1524         __register_request(osdc, req);
1525         req->r_sent = 0;
1526         req->r_got_reply = 0;
1527         rc = __map_request(osdc, req, 0);
1528         if (rc < 0) {
1529                 if (nofail) {
1530                         dout("osdc_start_request failed map, "
1531                                 " will retry %lld\n", req->r_tid);
1532                         rc = 0;
1533                 } else {
1534                         __unregister_request(osdc, req);
1535                 }
1536                 return rc;
1537         }
1538
1539         if (req->r_osd == NULL) {
1540                 dout("send_request %p no up osds in pg\n", req);
1541                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1542         } else {
1543                 __send_queued(osdc);
1544         }
1545
1546         return 0;
1547 }
1548
1549 /*
1550  * Timeout callback, called every N seconds when 1 or more osd
1551  * requests has been active for more than N seconds.  When this
1552  * happens, we ping all OSDs with requests who have timed out to
1553  * ensure any communications channel reset is detected.  Reset the
1554  * request timeouts another N seconds in the future as we go.
1555  * Reschedule the timeout event another N seconds in future (unless
1556  * there are no open requests).
1557  */
1558 static void handle_timeout(struct work_struct *work)
1559 {
1560         struct ceph_osd_client *osdc =
1561                 container_of(work, struct ceph_osd_client, timeout_work.work);
1562         struct ceph_osd_request *req;
1563         struct ceph_osd *osd;
1564         unsigned long keepalive =
1565                 osdc->client->options->osd_keepalive_timeout * HZ;
1566         struct list_head slow_osds;
1567         dout("timeout\n");
1568         down_read(&osdc->map_sem);
1569
1570         ceph_monc_request_next_osdmap(&osdc->client->monc);
1571
1572         mutex_lock(&osdc->request_mutex);
1573
1574         /*
1575          * ping osds that are a bit slow.  this ensures that if there
1576          * is a break in the TCP connection we will notice, and reopen
1577          * a connection with that osd (from the fault callback).
1578          */
1579         INIT_LIST_HEAD(&slow_osds);
1580         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1581                 if (time_before(jiffies, req->r_stamp + keepalive))
1582                         break;
1583
1584                 osd = req->r_osd;
1585                 BUG_ON(!osd);
1586                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1587                      req->r_tid, osd->o_osd);
1588                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1589         }
1590         while (!list_empty(&slow_osds)) {
1591                 osd = list_entry(slow_osds.next, struct ceph_osd,
1592                                  o_keepalive_item);
1593                 list_del_init(&osd->o_keepalive_item);
1594                 ceph_con_keepalive(&osd->o_con);
1595         }
1596
1597         __schedule_osd_timeout(osdc);
1598         __send_queued(osdc);
1599         mutex_unlock(&osdc->request_mutex);
1600         up_read(&osdc->map_sem);
1601 }
1602
1603 static void handle_osds_timeout(struct work_struct *work)
1604 {
1605         struct ceph_osd_client *osdc =
1606                 container_of(work, struct ceph_osd_client,
1607                              osds_timeout_work.work);
1608         unsigned long delay =
1609                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1610
1611         dout("osds timeout\n");
1612         down_read(&osdc->map_sem);
1613         remove_old_osds(osdc);
1614         up_read(&osdc->map_sem);
1615
1616         schedule_delayed_work(&osdc->osds_timeout_work,
1617                               round_jiffies_relative(delay));
1618 }
1619
1620 static int ceph_oloc_decode(void **p, void *end,
1621                             struct ceph_object_locator *oloc)
1622 {
1623         u8 struct_v, struct_cv;
1624         u32 len;
1625         void *struct_end;
1626         int ret = 0;
1627
1628         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1629         struct_v = ceph_decode_8(p);
1630         struct_cv = ceph_decode_8(p);
1631         if (struct_v < 3) {
1632                 pr_warn("got v %d < 3 cv %d of ceph_object_locator\n",
1633                         struct_v, struct_cv);
1634                 goto e_inval;
1635         }
1636         if (struct_cv > 6) {
1637                 pr_warn("got v %d cv %d > 6 of ceph_object_locator\n",
1638                         struct_v, struct_cv);
1639                 goto e_inval;
1640         }
1641         len = ceph_decode_32(p);
1642         ceph_decode_need(p, end, len, e_inval);
1643         struct_end = *p + len;
1644
1645         oloc->pool = ceph_decode_64(p);
1646         *p += 4; /* skip preferred */
1647
1648         len = ceph_decode_32(p);
1649         if (len > 0) {
1650                 pr_warn("ceph_object_locator::key is set\n");
1651                 goto e_inval;
1652         }
1653
1654         if (struct_v >= 5) {
1655                 len = ceph_decode_32(p);
1656                 if (len > 0) {
1657                         pr_warn("ceph_object_locator::nspace is set\n");
1658                         goto e_inval;
1659                 }
1660         }
1661
1662         if (struct_v >= 6) {
1663                 s64 hash = ceph_decode_64(p);
1664                 if (hash != -1) {
1665                         pr_warn("ceph_object_locator::hash is set\n");
1666                         goto e_inval;
1667                 }
1668         }
1669
1670         /* skip the rest */
1671         *p = struct_end;
1672 out:
1673         return ret;
1674
1675 e_inval:
1676         ret = -EINVAL;
1677         goto out;
1678 }
1679
1680 static int ceph_redirect_decode(void **p, void *end,
1681                                 struct ceph_request_redirect *redir)
1682 {
1683         u8 struct_v, struct_cv;
1684         u32 len;
1685         void *struct_end;
1686         int ret;
1687
1688         ceph_decode_need(p, end, 1 + 1 + 4, e_inval);
1689         struct_v = ceph_decode_8(p);
1690         struct_cv = ceph_decode_8(p);
1691         if (struct_cv > 1) {
1692                 pr_warn("got v %d cv %d > 1 of ceph_request_redirect\n",
1693                         struct_v, struct_cv);
1694                 goto e_inval;
1695         }
1696         len = ceph_decode_32(p);
1697         ceph_decode_need(p, end, len, e_inval);
1698         struct_end = *p + len;
1699
1700         ret = ceph_oloc_decode(p, end, &redir->oloc);
1701         if (ret)
1702                 goto out;
1703
1704         len = ceph_decode_32(p);
1705         if (len > 0) {
1706                 pr_warn("ceph_request_redirect::object_name is set\n");
1707                 goto e_inval;
1708         }
1709
1710         len = ceph_decode_32(p);
1711         *p += len; /* skip osd_instructions */
1712
1713         /* skip the rest */
1714         *p = struct_end;
1715 out:
1716         return ret;
1717
1718 e_inval:
1719         ret = -EINVAL;
1720         goto out;
1721 }
1722
1723 static void complete_request(struct ceph_osd_request *req)
1724 {
1725         complete_all(&req->r_safe_completion);  /* fsync waiter */
1726 }
1727
1728 /*
1729  * handle osd op reply.  either call the callback if it is specified,
1730  * or do the completion to wake up the waiting thread.
1731  */
1732 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1733                          struct ceph_connection *con)
1734 {
1735         void *p, *end;
1736         struct ceph_osd_request *req;
1737         struct ceph_request_redirect redir;
1738         u64 tid;
1739         int object_len;
1740         unsigned int numops;
1741         int payload_len, flags;
1742         s32 result;
1743         s32 retry_attempt;
1744         struct ceph_pg pg;
1745         int err;
1746         u32 reassert_epoch;
1747         u64 reassert_version;
1748         u32 osdmap_epoch;
1749         int already_completed;
1750         u32 bytes;
1751         unsigned int i;
1752
1753         tid = le64_to_cpu(msg->hdr.tid);
1754         dout("handle_reply %p tid %llu\n", msg, tid);
1755
1756         p = msg->front.iov_base;
1757         end = p + msg->front.iov_len;
1758
1759         ceph_decode_need(&p, end, 4, bad);
1760         object_len = ceph_decode_32(&p);
1761         ceph_decode_need(&p, end, object_len, bad);
1762         p += object_len;
1763
1764         err = ceph_decode_pgid(&p, end, &pg);
1765         if (err)
1766                 goto bad;
1767
1768         ceph_decode_need(&p, end, 8 + 4 + 4 + 8 + 4, bad);
1769         flags = ceph_decode_64(&p);
1770         result = ceph_decode_32(&p);
1771         reassert_epoch = ceph_decode_32(&p);
1772         reassert_version = ceph_decode_64(&p);
1773         osdmap_epoch = ceph_decode_32(&p);
1774
1775         /* lookup */
1776         down_read(&osdc->map_sem);
1777         mutex_lock(&osdc->request_mutex);
1778         req = __lookup_request(osdc, tid);
1779         if (req == NULL) {
1780                 dout("handle_reply tid %llu dne\n", tid);
1781                 goto bad_mutex;
1782         }
1783         ceph_osdc_get_request(req);
1784
1785         dout("handle_reply %p tid %llu req %p result %d\n", msg, tid,
1786              req, result);
1787
1788         ceph_decode_need(&p, end, 4, bad_put);
1789         numops = ceph_decode_32(&p);
1790         if (numops > CEPH_OSD_MAX_OP)
1791                 goto bad_put;
1792         if (numops != req->r_num_ops)
1793                 goto bad_put;
1794         payload_len = 0;
1795         ceph_decode_need(&p, end, numops * sizeof(struct ceph_osd_op), bad_put);
1796         for (i = 0; i < numops; i++) {
1797                 struct ceph_osd_op *op = p;
1798                 int len;
1799
1800                 len = le32_to_cpu(op->payload_len);
1801                 req->r_reply_op_len[i] = len;
1802                 dout(" op %d has %d bytes\n", i, len);
1803                 payload_len += len;
1804                 p += sizeof(*op);
1805         }
1806         bytes = le32_to_cpu(msg->hdr.data_len);
1807         if (payload_len != bytes) {
1808                 pr_warn("sum of op payload lens %d != data_len %d\n",
1809                         payload_len, bytes);
1810                 goto bad_put;
1811         }
1812
1813         ceph_decode_need(&p, end, 4 + numops * 4, bad_put);
1814         retry_attempt = ceph_decode_32(&p);
1815         for (i = 0; i < numops; i++)
1816                 req->r_reply_op_result[i] = ceph_decode_32(&p);
1817
1818         if (le16_to_cpu(msg->hdr.version) >= 6) {
1819                 p += 8 + 4; /* skip replay_version */
1820                 p += 8; /* skip user_version */
1821
1822                 err = ceph_redirect_decode(&p, end, &redir);
1823                 if (err)
1824                         goto bad_put;
1825         } else {
1826                 redir.oloc.pool = -1;
1827         }
1828
1829         if (redir.oloc.pool != -1) {
1830                 dout("redirect pool %lld\n", redir.oloc.pool);
1831
1832                 __unregister_request(osdc, req);
1833
1834                 req->r_target_oloc = redir.oloc; /* struct */
1835
1836                 /*
1837                  * Start redirect requests with nofail=true.  If
1838                  * mapping fails, request will end up on the notarget
1839                  * list, waiting for the new osdmap (which can take
1840                  * a while), even though the original request mapped
1841                  * successfully.  In the future we might want to follow
1842                  * original request's nofail setting here.
1843                  */
1844                 err = __ceph_osdc_start_request(osdc, req, true);
1845                 BUG_ON(err);
1846
1847                 goto out_unlock;
1848         }
1849
1850         already_completed = req->r_got_reply;
1851         if (!req->r_got_reply) {
1852                 req->r_result = result;
1853                 dout("handle_reply result %d bytes %d\n", req->r_result,
1854                      bytes);
1855                 if (req->r_result == 0)
1856                         req->r_result = bytes;
1857
1858                 /* in case this is a write and we need to replay, */
1859                 req->r_reassert_version.epoch = cpu_to_le32(reassert_epoch);
1860                 req->r_reassert_version.version = cpu_to_le64(reassert_version);
1861
1862                 req->r_got_reply = 1;
1863         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1864                 dout("handle_reply tid %llu dup ack\n", tid);
1865                 goto out_unlock;
1866         }
1867
1868         dout("handle_reply tid %llu flags %d\n", tid, flags);
1869
1870         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1871                 __register_linger_request(osdc, req);
1872
1873         /* either this is a read, or we got the safe response */
1874         if (result < 0 ||
1875             (flags & CEPH_OSD_FLAG_ONDISK) ||
1876             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1877                 __unregister_request(osdc, req);
1878
1879         mutex_unlock(&osdc->request_mutex);
1880         up_read(&osdc->map_sem);
1881
1882         if (!already_completed) {
1883                 if (req->r_unsafe_callback &&
1884                     result >= 0 && !(flags & CEPH_OSD_FLAG_ONDISK))
1885                         req->r_unsafe_callback(req, true);
1886                 if (req->r_callback)
1887                         req->r_callback(req, msg);
1888                 else
1889                         complete_all(&req->r_completion);
1890         }
1891
1892         if (flags & CEPH_OSD_FLAG_ONDISK) {
1893                 if (req->r_unsafe_callback && already_completed)
1894                         req->r_unsafe_callback(req, false);
1895                 complete_request(req);
1896         }
1897
1898 out:
1899         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1900         ceph_osdc_put_request(req);
1901         return;
1902 out_unlock:
1903         mutex_unlock(&osdc->request_mutex);
1904         up_read(&osdc->map_sem);
1905         goto out;
1906
1907 bad_put:
1908         req->r_result = -EIO;
1909         __unregister_request(osdc, req);
1910         if (req->r_callback)
1911                 req->r_callback(req, msg);
1912         else
1913                 complete_all(&req->r_completion);
1914         complete_request(req);
1915         ceph_osdc_put_request(req);
1916 bad_mutex:
1917         mutex_unlock(&osdc->request_mutex);
1918         up_read(&osdc->map_sem);
1919 bad:
1920         pr_err("corrupt osd_op_reply got %d %d\n",
1921                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len));
1922         ceph_msg_dump(msg);
1923 }
1924
1925 static void reset_changed_osds(struct ceph_osd_client *osdc)
1926 {
1927         struct rb_node *p, *n;
1928
1929         for (p = rb_first(&osdc->osds); p; p = n) {
1930                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1931
1932                 n = rb_next(p);
1933                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1934                     memcmp(&osd->o_con.peer_addr,
1935                            ceph_osd_addr(osdc->osdmap,
1936                                          osd->o_osd),
1937                            sizeof(struct ceph_entity_addr)) != 0)
1938                         __reset_osd(osdc, osd);
1939         }
1940 }
1941
1942 /*
1943  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1944  * no osd, request a new map.
1945  *
1946  * Caller should hold map_sem for read.
1947  */
1948 static void kick_requests(struct ceph_osd_client *osdc, bool force_resend,
1949                           bool force_resend_writes)
1950 {
1951         struct ceph_osd_request *req, *nreq;
1952         struct rb_node *p;
1953         int needmap = 0;
1954         int err;
1955         bool force_resend_req;
1956
1957         dout("kick_requests %s %s\n", force_resend ? " (force resend)" : "",
1958                 force_resend_writes ? " (force resend writes)" : "");
1959         mutex_lock(&osdc->request_mutex);
1960         for (p = rb_first(&osdc->requests); p; ) {
1961                 req = rb_entry(p, struct ceph_osd_request, r_node);
1962                 p = rb_next(p);
1963
1964                 /*
1965                  * For linger requests that have not yet been
1966                  * registered, move them to the linger list; they'll
1967                  * be sent to the osd in the loop below.  Unregister
1968                  * the request before re-registering it as a linger
1969                  * request to ensure the __map_request() below
1970                  * will decide it needs to be sent.
1971                  */
1972                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1973                         dout("%p tid %llu restart on osd%d\n",
1974                              req, req->r_tid,
1975                              req->r_osd ? req->r_osd->o_osd : -1);
1976                         ceph_osdc_get_request(req);
1977                         __unregister_request(osdc, req);
1978                         __register_linger_request(osdc, req);
1979                         ceph_osdc_put_request(req);
1980                         continue;
1981                 }
1982
1983                 force_resend_req = force_resend ||
1984                         (force_resend_writes &&
1985                                 req->r_flags & CEPH_OSD_FLAG_WRITE);
1986                 err = __map_request(osdc, req, force_resend_req);
1987                 if (err < 0)
1988                         continue;  /* error */
1989                 if (req->r_osd == NULL) {
1990                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1991                         needmap++;  /* request a newer map */
1992                 } else if (err > 0) {
1993                         if (!req->r_linger) {
1994                                 dout("%p tid %llu requeued on osd%d\n", req,
1995                                      req->r_tid,
1996                                      req->r_osd ? req->r_osd->o_osd : -1);
1997                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1998                         }
1999                 }
2000         }
2001
2002         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
2003                                  r_linger_item) {
2004                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
2005
2006                 err = __map_request(osdc, req,
2007                                     force_resend || force_resend_writes);
2008                 dout("__map_request returned %d\n", err);
2009                 if (err == 0)
2010                         continue;  /* no change and no osd was specified */
2011                 if (err < 0)
2012                         continue;  /* hrm! */
2013                 if (req->r_osd == NULL) {
2014                         dout("tid %llu maps to no valid osd\n", req->r_tid);
2015                         needmap++;  /* request a newer map */
2016                         continue;
2017                 }
2018
2019                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
2020                      req->r_osd ? req->r_osd->o_osd : -1);
2021                 __register_request(osdc, req);
2022                 __unregister_linger_request(osdc, req);
2023         }
2024         reset_changed_osds(osdc);
2025         mutex_unlock(&osdc->request_mutex);
2026
2027         if (needmap) {
2028                 dout("%d requests for down osds, need new map\n", needmap);
2029                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2030         }
2031 }
2032
2033
2034 /*
2035  * Process updated osd map.
2036  *
2037  * The message contains any number of incremental and full maps, normally
2038  * indicating some sort of topology change in the cluster.  Kick requests
2039  * off to different OSDs as needed.
2040  */
2041 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
2042 {
2043         void *p, *end, *next;
2044         u32 nr_maps, maplen;
2045         u32 epoch;
2046         struct ceph_osdmap *newmap = NULL, *oldmap;
2047         int err;
2048         struct ceph_fsid fsid;
2049         bool was_full;
2050
2051         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
2052         p = msg->front.iov_base;
2053         end = p + msg->front.iov_len;
2054
2055         /* verify fsid */
2056         ceph_decode_need(&p, end, sizeof(fsid), bad);
2057         ceph_decode_copy(&p, &fsid, sizeof(fsid));
2058         if (ceph_check_fsid(osdc->client, &fsid) < 0)
2059                 return;
2060
2061         down_write(&osdc->map_sem);
2062
2063         was_full = ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL);
2064
2065         /* incremental maps */
2066         ceph_decode_32_safe(&p, end, nr_maps, bad);
2067         dout(" %d inc maps\n", nr_maps);
2068         while (nr_maps > 0) {
2069                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2070                 epoch = ceph_decode_32(&p);
2071                 maplen = ceph_decode_32(&p);
2072                 ceph_decode_need(&p, end, maplen, bad);
2073                 next = p + maplen;
2074                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
2075                         dout("applying incremental map %u len %d\n",
2076                              epoch, maplen);
2077                         newmap = osdmap_apply_incremental(&p, next,
2078                                                           osdc->osdmap,
2079                                                           &osdc->client->msgr);
2080                         if (IS_ERR(newmap)) {
2081                                 err = PTR_ERR(newmap);
2082                                 goto bad;
2083                         }
2084                         BUG_ON(!newmap);
2085                         if (newmap != osdc->osdmap) {
2086                                 ceph_osdmap_destroy(osdc->osdmap);
2087                                 osdc->osdmap = newmap;
2088                         }
2089                         was_full = was_full ||
2090                                 ceph_osdmap_flag(osdc->osdmap,
2091                                                  CEPH_OSDMAP_FULL);
2092                         kick_requests(osdc, 0, was_full);
2093                 } else {
2094                         dout("ignoring incremental map %u len %d\n",
2095                              epoch, maplen);
2096                 }
2097                 p = next;
2098                 nr_maps--;
2099         }
2100         if (newmap)
2101                 goto done;
2102
2103         /* full maps */
2104         ceph_decode_32_safe(&p, end, nr_maps, bad);
2105         dout(" %d full maps\n", nr_maps);
2106         while (nr_maps) {
2107                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2108                 epoch = ceph_decode_32(&p);
2109                 maplen = ceph_decode_32(&p);
2110                 ceph_decode_need(&p, end, maplen, bad);
2111                 if (nr_maps > 1) {
2112                         dout("skipping non-latest full map %u len %d\n",
2113                              epoch, maplen);
2114                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
2115                         dout("skipping full map %u len %d, "
2116                              "older than our %u\n", epoch, maplen,
2117                              osdc->osdmap->epoch);
2118                 } else {
2119                         int skipped_map = 0;
2120
2121                         dout("taking full map %u len %d\n", epoch, maplen);
2122                         newmap = ceph_osdmap_decode(&p, p+maplen);
2123                         if (IS_ERR(newmap)) {
2124                                 err = PTR_ERR(newmap);
2125                                 goto bad;
2126                         }
2127                         BUG_ON(!newmap);
2128                         oldmap = osdc->osdmap;
2129                         osdc->osdmap = newmap;
2130                         if (oldmap) {
2131                                 if (oldmap->epoch + 1 < newmap->epoch)
2132                                         skipped_map = 1;
2133                                 ceph_osdmap_destroy(oldmap);
2134                         }
2135                         was_full = was_full ||
2136                                 ceph_osdmap_flag(osdc->osdmap,
2137                                                  CEPH_OSDMAP_FULL);
2138                         kick_requests(osdc, skipped_map, was_full);
2139                 }
2140                 p += maplen;
2141                 nr_maps--;
2142         }
2143
2144         if (!osdc->osdmap)
2145                 goto bad;
2146 done:
2147         downgrade_write(&osdc->map_sem);
2148         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
2149
2150         /*
2151          * subscribe to subsequent osdmap updates if full to ensure
2152          * we find out when we are no longer full and stop returning
2153          * ENOSPC.
2154          */
2155         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) ||
2156                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSERD) ||
2157                 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_PAUSEWR))
2158                 ceph_monc_request_next_osdmap(&osdc->client->monc);
2159
2160         mutex_lock(&osdc->request_mutex);
2161         __send_queued(osdc);
2162         mutex_unlock(&osdc->request_mutex);
2163         up_read(&osdc->map_sem);
2164         wake_up_all(&osdc->client->auth_wq);
2165         return;
2166
2167 bad:
2168         pr_err("osdc handle_map corrupt msg\n");
2169         ceph_msg_dump(msg);
2170         up_write(&osdc->map_sem);
2171 }
2172
2173 /*
2174  * watch/notify callback event infrastructure
2175  *
2176  * These callbacks are used both for watch and notify operations.
2177  */
2178 static void __release_event(struct kref *kref)
2179 {
2180         struct ceph_osd_event *event =
2181                 container_of(kref, struct ceph_osd_event, kref);
2182
2183         dout("__release_event %p\n", event);
2184         kfree(event);
2185 }
2186
2187 static void get_event(struct ceph_osd_event *event)
2188 {
2189         kref_get(&event->kref);
2190 }
2191
2192 void ceph_osdc_put_event(struct ceph_osd_event *event)
2193 {
2194         kref_put(&event->kref, __release_event);
2195 }
2196 EXPORT_SYMBOL(ceph_osdc_put_event);
2197
2198 static void __insert_event(struct ceph_osd_client *osdc,
2199                              struct ceph_osd_event *new)
2200 {
2201         struct rb_node **p = &osdc->event_tree.rb_node;
2202         struct rb_node *parent = NULL;
2203         struct ceph_osd_event *event = NULL;
2204
2205         while (*p) {
2206                 parent = *p;
2207                 event = rb_entry(parent, struct ceph_osd_event, node);
2208                 if (new->cookie < event->cookie)
2209                         p = &(*p)->rb_left;
2210                 else if (new->cookie > event->cookie)
2211                         p = &(*p)->rb_right;
2212                 else
2213                         BUG();
2214         }
2215
2216         rb_link_node(&new->node, parent, p);
2217         rb_insert_color(&new->node, &osdc->event_tree);
2218 }
2219
2220 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
2221                                                 u64 cookie)
2222 {
2223         struct rb_node **p = &osdc->event_tree.rb_node;
2224         struct rb_node *parent = NULL;
2225         struct ceph_osd_event *event = NULL;
2226
2227         while (*p) {
2228                 parent = *p;
2229                 event = rb_entry(parent, struct ceph_osd_event, node);
2230                 if (cookie < event->cookie)
2231                         p = &(*p)->rb_left;
2232                 else if (cookie > event->cookie)
2233                         p = &(*p)->rb_right;
2234                 else
2235                         return event;
2236         }
2237         return NULL;
2238 }
2239
2240 static void __remove_event(struct ceph_osd_event *event)
2241 {
2242         struct ceph_osd_client *osdc = event->osdc;
2243
2244         if (!RB_EMPTY_NODE(&event->node)) {
2245                 dout("__remove_event removed %p\n", event);
2246                 rb_erase(&event->node, &osdc->event_tree);
2247                 ceph_osdc_put_event(event);
2248         } else {
2249                 dout("__remove_event didn't remove %p\n", event);
2250         }
2251 }
2252
2253 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
2254                            void (*event_cb)(u64, u64, u8, void *),
2255                            void *data, struct ceph_osd_event **pevent)
2256 {
2257         struct ceph_osd_event *event;
2258
2259         event = kmalloc(sizeof(*event), GFP_NOIO);
2260         if (!event)
2261                 return -ENOMEM;
2262
2263         dout("create_event %p\n", event);
2264         event->cb = event_cb;
2265         event->one_shot = 0;
2266         event->data = data;
2267         event->osdc = osdc;
2268         INIT_LIST_HEAD(&event->osd_node);
2269         RB_CLEAR_NODE(&event->node);
2270         kref_init(&event->kref);   /* one ref for us */
2271         kref_get(&event->kref);    /* one ref for the caller */
2272
2273         spin_lock(&osdc->event_lock);
2274         event->cookie = ++osdc->event_count;
2275         __insert_event(osdc, event);
2276         spin_unlock(&osdc->event_lock);
2277
2278         *pevent = event;
2279         return 0;
2280 }
2281 EXPORT_SYMBOL(ceph_osdc_create_event);
2282
2283 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
2284 {
2285         struct ceph_osd_client *osdc = event->osdc;
2286
2287         dout("cancel_event %p\n", event);
2288         spin_lock(&osdc->event_lock);
2289         __remove_event(event);
2290         spin_unlock(&osdc->event_lock);
2291         ceph_osdc_put_event(event); /* caller's */
2292 }
2293 EXPORT_SYMBOL(ceph_osdc_cancel_event);
2294
2295
2296 static void do_event_work(struct work_struct *work)
2297 {
2298         struct ceph_osd_event_work *event_work =
2299                 container_of(work, struct ceph_osd_event_work, work);
2300         struct ceph_osd_event *event = event_work->event;
2301         u64 ver = event_work->ver;
2302         u64 notify_id = event_work->notify_id;
2303         u8 opcode = event_work->opcode;
2304
2305         dout("do_event_work completing %p\n", event);
2306         event->cb(ver, notify_id, opcode, event->data);
2307         dout("do_event_work completed %p\n", event);
2308         ceph_osdc_put_event(event);
2309         kfree(event_work);
2310 }
2311
2312
2313 /*
2314  * Process osd watch notifications
2315  */
2316 static void handle_watch_notify(struct ceph_osd_client *osdc,
2317                                 struct ceph_msg *msg)
2318 {
2319         void *p, *end;
2320         u8 proto_ver;
2321         u64 cookie, ver, notify_id;
2322         u8 opcode;
2323         struct ceph_osd_event *event;
2324         struct ceph_osd_event_work *event_work;
2325
2326         p = msg->front.iov_base;
2327         end = p + msg->front.iov_len;
2328
2329         ceph_decode_8_safe(&p, end, proto_ver, bad);
2330         ceph_decode_8_safe(&p, end, opcode, bad);
2331         ceph_decode_64_safe(&p, end, cookie, bad);
2332         ceph_decode_64_safe(&p, end, ver, bad);
2333         ceph_decode_64_safe(&p, end, notify_id, bad);
2334
2335         spin_lock(&osdc->event_lock);
2336         event = __find_event(osdc, cookie);
2337         if (event) {
2338                 BUG_ON(event->one_shot);
2339                 get_event(event);
2340         }
2341         spin_unlock(&osdc->event_lock);
2342         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
2343              cookie, ver, event);
2344         if (event) {
2345                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
2346                 if (!event_work) {
2347                         pr_err("couldn't allocate event_work\n");
2348                         ceph_osdc_put_event(event);
2349                         return;
2350                 }
2351                 INIT_WORK(&event_work->work, do_event_work);
2352                 event_work->event = event;
2353                 event_work->ver = ver;
2354                 event_work->notify_id = notify_id;
2355                 event_work->opcode = opcode;
2356
2357                 queue_work(osdc->notify_wq, &event_work->work);
2358         }
2359
2360         return;
2361
2362 bad:
2363         pr_err("osdc handle_watch_notify corrupt msg\n");
2364 }
2365
2366 /*
2367  * build new request AND message
2368  *
2369  */
2370 void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
2371                                 struct ceph_snap_context *snapc, u64 snap_id,
2372                                 struct timespec *mtime)
2373 {
2374         struct ceph_msg *msg = req->r_request;
2375         void *p;
2376         size_t msg_size;
2377         int flags = req->r_flags;
2378         u64 data_len;
2379         unsigned int i;
2380
2381         req->r_snapid = snap_id;
2382         req->r_snapc = ceph_get_snap_context(snapc);
2383
2384         /* encode request */
2385         msg->hdr.version = cpu_to_le16(4);
2386
2387         p = msg->front.iov_base;
2388         ceph_encode_32(&p, 1);   /* client_inc  is always 1 */
2389         req->r_request_osdmap_epoch = p;
2390         p += 4;
2391         req->r_request_flags = p;
2392         p += 4;
2393         if (req->r_flags & CEPH_OSD_FLAG_WRITE)
2394                 ceph_encode_timespec(p, mtime);
2395         p += sizeof(struct ceph_timespec);
2396         req->r_request_reassert_version = p;
2397         p += sizeof(struct ceph_eversion); /* will get filled in */
2398
2399         /* oloc */
2400         ceph_encode_8(&p, 4);
2401         ceph_encode_8(&p, 4);
2402         ceph_encode_32(&p, 8 + 4 + 4);
2403         req->r_request_pool = p;
2404         p += 8;
2405         ceph_encode_32(&p, -1);  /* preferred */
2406         ceph_encode_32(&p, 0);   /* key len */
2407
2408         ceph_encode_8(&p, 1);
2409         req->r_request_pgid = p;
2410         p += 8 + 4;
2411         ceph_encode_32(&p, -1);  /* preferred */
2412
2413         /* oid */
2414         ceph_encode_32(&p, req->r_base_oid.name_len);
2415         memcpy(p, req->r_base_oid.name, req->r_base_oid.name_len);
2416         dout("oid '%.*s' len %d\n", req->r_base_oid.name_len,
2417              req->r_base_oid.name, req->r_base_oid.name_len);
2418         p += req->r_base_oid.name_len;
2419
2420         /* ops--can imply data */
2421         ceph_encode_16(&p, (u16)req->r_num_ops);
2422         data_len = 0;
2423         for (i = 0; i < req->r_num_ops; i++) {
2424                 data_len += osd_req_encode_op(req, p, i);
2425                 p += sizeof(struct ceph_osd_op);
2426         }
2427
2428         /* snaps */
2429         ceph_encode_64(&p, req->r_snapid);
2430         ceph_encode_64(&p, req->r_snapc ? req->r_snapc->seq : 0);
2431         ceph_encode_32(&p, req->r_snapc ? req->r_snapc->num_snaps : 0);
2432         if (req->r_snapc) {
2433                 for (i = 0; i < snapc->num_snaps; i++) {
2434                         ceph_encode_64(&p, req->r_snapc->snaps[i]);
2435                 }
2436         }
2437
2438         req->r_request_attempts = p;
2439         p += 4;
2440
2441         /* data */
2442         if (flags & CEPH_OSD_FLAG_WRITE) {
2443                 u16 data_off;
2444
2445                 /*
2446                  * The header "data_off" is a hint to the receiver
2447                  * allowing it to align received data into its
2448                  * buffers such that there's no need to re-copy
2449                  * it before writing it to disk (direct I/O).
2450                  */
2451                 data_off = (u16) (off & 0xffff);
2452                 req->r_request->hdr.data_off = cpu_to_le16(data_off);
2453         }
2454         req->r_request->hdr.data_len = cpu_to_le32(data_len);
2455
2456         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
2457         msg_size = p - msg->front.iov_base;
2458         msg->front.iov_len = msg_size;
2459         msg->hdr.front_len = cpu_to_le32(msg_size);
2460
2461         dout("build_request msg_size was %d\n", (int)msg_size);
2462 }
2463 EXPORT_SYMBOL(ceph_osdc_build_request);
2464
2465 /*
2466  * Register request, send initial attempt.
2467  */
2468 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
2469                             struct ceph_osd_request *req,
2470                             bool nofail)
2471 {
2472         int rc;
2473
2474         down_read(&osdc->map_sem);
2475         mutex_lock(&osdc->request_mutex);
2476
2477         rc = __ceph_osdc_start_request(osdc, req, nofail);
2478
2479         mutex_unlock(&osdc->request_mutex);
2480         up_read(&osdc->map_sem);
2481
2482         return rc;
2483 }
2484 EXPORT_SYMBOL(ceph_osdc_start_request);
2485
2486 /*
2487  * Unregister a registered request.  The request is not completed (i.e.
2488  * no callbacks or wakeups) - higher layers are supposed to know what
2489  * they are canceling.
2490  */
2491 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
2492 {
2493         struct ceph_osd_client *osdc = req->r_osdc;
2494
2495         mutex_lock(&osdc->request_mutex);
2496         if (req->r_linger)
2497                 __unregister_linger_request(osdc, req);
2498         __unregister_request(osdc, req);
2499         mutex_unlock(&osdc->request_mutex);
2500
2501         dout("%s %p tid %llu canceled\n", __func__, req, req->r_tid);
2502 }
2503 EXPORT_SYMBOL(ceph_osdc_cancel_request);
2504
2505 /*
2506  * wait for a request to complete
2507  */
2508 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
2509                            struct ceph_osd_request *req)
2510 {
2511         int rc;
2512
2513         dout("%s %p tid %llu\n", __func__, req, req->r_tid);
2514
2515         rc = wait_for_completion_interruptible(&req->r_completion);
2516         if (rc < 0) {
2517                 dout("%s %p tid %llu interrupted\n", __func__, req, req->r_tid);
2518                 ceph_osdc_cancel_request(req);
2519                 complete_request(req);
2520                 return rc;
2521         }
2522
2523         dout("%s %p tid %llu result %d\n", __func__, req, req->r_tid,
2524              req->r_result);
2525         return req->r_result;
2526 }
2527 EXPORT_SYMBOL(ceph_osdc_wait_request);
2528
2529 /*
2530  * sync - wait for all in-flight requests to flush.  avoid starvation.
2531  */
2532 void ceph_osdc_sync(struct ceph_osd_client *osdc)
2533 {
2534         struct ceph_osd_request *req;
2535         u64 last_tid, next_tid = 0;
2536
2537         mutex_lock(&osdc->request_mutex);
2538         last_tid = osdc->last_tid;
2539         while (1) {
2540                 req = __lookup_request_ge(osdc, next_tid);
2541                 if (!req)
2542                         break;
2543                 if (req->r_tid > last_tid)
2544                         break;
2545
2546                 next_tid = req->r_tid + 1;
2547                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
2548                         continue;
2549
2550                 ceph_osdc_get_request(req);
2551                 mutex_unlock(&osdc->request_mutex);
2552                 dout("sync waiting on tid %llu (last is %llu)\n",
2553                      req->r_tid, last_tid);
2554                 wait_for_completion(&req->r_safe_completion);
2555                 mutex_lock(&osdc->request_mutex);
2556                 ceph_osdc_put_request(req);
2557         }
2558         mutex_unlock(&osdc->request_mutex);
2559         dout("sync done (thru tid %llu)\n", last_tid);
2560 }
2561 EXPORT_SYMBOL(ceph_osdc_sync);
2562
2563 /*
2564  * Call all pending notify callbacks - for use after a watch is
2565  * unregistered, to make sure no more callbacks for it will be invoked
2566  */
2567 void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
2568 {
2569         flush_workqueue(osdc->notify_wq);
2570 }
2571 EXPORT_SYMBOL(ceph_osdc_flush_notifies);
2572
2573
2574 /*
2575  * init, shutdown
2576  */
2577 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
2578 {
2579         int err;
2580
2581         dout("init\n");
2582         osdc->client = client;
2583         osdc->osdmap = NULL;
2584         init_rwsem(&osdc->map_sem);
2585         init_completion(&osdc->map_waiters);
2586         osdc->last_requested_map = 0;
2587         mutex_init(&osdc->request_mutex);
2588         osdc->last_tid = 0;
2589         osdc->osds = RB_ROOT;
2590         INIT_LIST_HEAD(&osdc->osd_lru);
2591         osdc->requests = RB_ROOT;
2592         INIT_LIST_HEAD(&osdc->req_lru);
2593         INIT_LIST_HEAD(&osdc->req_unsent);
2594         INIT_LIST_HEAD(&osdc->req_notarget);
2595         INIT_LIST_HEAD(&osdc->req_linger);
2596         osdc->num_requests = 0;
2597         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
2598         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
2599         spin_lock_init(&osdc->event_lock);
2600         osdc->event_tree = RB_ROOT;
2601         osdc->event_count = 0;
2602
2603         schedule_delayed_work(&osdc->osds_timeout_work,
2604            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
2605
2606         err = -ENOMEM;
2607         osdc->req_mempool = mempool_create_kmalloc_pool(10,
2608                                         sizeof(struct ceph_osd_request));
2609         if (!osdc->req_mempool)
2610                 goto out;
2611
2612         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
2613                                 OSD_OP_FRONT_LEN, 10, true,
2614                                 "osd_op");
2615         if (err < 0)
2616                 goto out_mempool;
2617         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
2618                                 OSD_OPREPLY_FRONT_LEN, 10, true,
2619                                 "osd_op_reply");
2620         if (err < 0)
2621                 goto out_msgpool;
2622
2623         err = -ENOMEM;
2624         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
2625         if (!osdc->notify_wq)
2626                 goto out_msgpool_reply;
2627
2628         return 0;
2629
2630 out_msgpool_reply:
2631         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2632 out_msgpool:
2633         ceph_msgpool_destroy(&osdc->msgpool_op);
2634 out_mempool:
2635         mempool_destroy(osdc->req_mempool);
2636 out:
2637         return err;
2638 }
2639
2640 void ceph_osdc_stop(struct ceph_osd_client *osdc)
2641 {
2642         flush_workqueue(osdc->notify_wq);
2643         destroy_workqueue(osdc->notify_wq);
2644         cancel_delayed_work_sync(&osdc->timeout_work);
2645         cancel_delayed_work_sync(&osdc->osds_timeout_work);
2646         if (osdc->osdmap) {
2647                 ceph_osdmap_destroy(osdc->osdmap);
2648                 osdc->osdmap = NULL;
2649         }
2650         remove_all_osds(osdc);
2651         mempool_destroy(osdc->req_mempool);
2652         ceph_msgpool_destroy(&osdc->msgpool_op);
2653         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
2654 }
2655
2656 /*
2657  * Read some contiguous pages.  If we cross a stripe boundary, shorten
2658  * *plen.  Return number of bytes read, or error.
2659  */
2660 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
2661                         struct ceph_vino vino, struct ceph_file_layout *layout,
2662                         u64 off, u64 *plen,
2663                         u32 truncate_seq, u64 truncate_size,
2664                         struct page **pages, int num_pages, int page_align)
2665 {
2666         struct ceph_osd_request *req;
2667         int rc = 0;
2668
2669         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
2670              vino.snap, off, *plen);
2671         req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1,
2672                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
2673                                     NULL, truncate_seq, truncate_size,
2674                                     false);
2675         if (IS_ERR(req))
2676                 return PTR_ERR(req);
2677
2678         /* it may be a short read due to an object boundary */
2679
2680         osd_req_op_extent_osd_data_pages(req, 0,
2681                                 pages, *plen, page_align, false, false);
2682
2683         dout("readpages  final extent is %llu~%llu (%llu bytes align %d)\n",
2684              off, *plen, *plen, page_align);
2685
2686         ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
2687
2688         rc = ceph_osdc_start_request(osdc, req, false);
2689         if (!rc)
2690                 rc = ceph_osdc_wait_request(osdc, req);
2691
2692         ceph_osdc_put_request(req);
2693         dout("readpages result %d\n", rc);
2694         return rc;
2695 }
2696 EXPORT_SYMBOL(ceph_osdc_readpages);
2697
2698 /*
2699  * do a synchronous write on N pages
2700  */
2701 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
2702                          struct ceph_file_layout *layout,
2703                          struct ceph_snap_context *snapc,
2704                          u64 off, u64 len,
2705                          u32 truncate_seq, u64 truncate_size,
2706                          struct timespec *mtime,
2707                          struct page **pages, int num_pages)
2708 {
2709         struct ceph_osd_request *req;
2710         int rc = 0;
2711         int page_align = off & ~PAGE_MASK;
2712
2713         BUG_ON(vino.snap != CEPH_NOSNAP);       /* snapshots aren't writeable */
2714         req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1,
2715                                     CEPH_OSD_OP_WRITE,
2716                                     CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
2717                                     snapc, truncate_seq, truncate_size,
2718                                     true);
2719         if (IS_ERR(req))
2720                 return PTR_ERR(req);
2721
2722         /* it may be a short write due to an object boundary */
2723         osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
2724                                 false, false);
2725         dout("writepages %llu~%llu (%llu bytes)\n", off, len, len);
2726
2727         ceph_osdc_build_request(req, off, snapc, CEPH_NOSNAP, mtime);
2728
2729         rc = ceph_osdc_start_request(osdc, req, true);
2730         if (!rc)
2731                 rc = ceph_osdc_wait_request(osdc, req);
2732
2733         ceph_osdc_put_request(req);
2734         if (rc == 0)
2735                 rc = len;
2736         dout("writepages result %d\n", rc);
2737         return rc;
2738 }
2739 EXPORT_SYMBOL(ceph_osdc_writepages);
2740
2741 int ceph_osdc_setup(void)
2742 {
2743         BUG_ON(ceph_osd_request_cache);
2744         ceph_osd_request_cache = kmem_cache_create("ceph_osd_request",
2745                                         sizeof (struct ceph_osd_request),
2746                                         __alignof__(struct ceph_osd_request),
2747                                         0, NULL);
2748
2749         return ceph_osd_request_cache ? 0 : -ENOMEM;
2750 }
2751 EXPORT_SYMBOL(ceph_osdc_setup);
2752
2753 void ceph_osdc_cleanup(void)
2754 {
2755         BUG_ON(!ceph_osd_request_cache);
2756         kmem_cache_destroy(ceph_osd_request_cache);
2757         ceph_osd_request_cache = NULL;
2758 }
2759 EXPORT_SYMBOL(ceph_osdc_cleanup);
2760
2761 /*
2762  * handle incoming message
2763  */
2764 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2765 {
2766         struct ceph_osd *osd = con->private;
2767         struct ceph_osd_client *osdc;
2768         int type = le16_to_cpu(msg->hdr.type);
2769
2770         if (!osd)
2771                 goto out;
2772         osdc = osd->o_osdc;
2773
2774         switch (type) {
2775         case CEPH_MSG_OSD_MAP:
2776                 ceph_osdc_handle_map(osdc, msg);
2777                 break;
2778         case CEPH_MSG_OSD_OPREPLY:
2779                 handle_reply(osdc, msg, con);
2780                 break;
2781         case CEPH_MSG_WATCH_NOTIFY:
2782                 handle_watch_notify(osdc, msg);
2783                 break;
2784
2785         default:
2786                 pr_err("received unknown message type %d %s\n", type,
2787                        ceph_msg_type_name(type));
2788         }
2789 out:
2790         ceph_msg_put(msg);
2791 }
2792
2793 /*
2794  * lookup and return message for incoming reply.  set up reply message
2795  * pages.
2796  */
2797 static struct ceph_msg *get_reply(struct ceph_connection *con,
2798                                   struct ceph_msg_header *hdr,
2799                                   int *skip)
2800 {
2801         struct ceph_osd *osd = con->private;
2802         struct ceph_osd_client *osdc = osd->o_osdc;
2803         struct ceph_msg *m;
2804         struct ceph_osd_request *req;
2805         int front_len = le32_to_cpu(hdr->front_len);
2806         int data_len = le32_to_cpu(hdr->data_len);
2807         u64 tid;
2808
2809         tid = le64_to_cpu(hdr->tid);
2810         mutex_lock(&osdc->request_mutex);
2811         req = __lookup_request(osdc, tid);
2812         if (!req) {
2813                 *skip = 1;
2814                 m = NULL;
2815                 dout("get_reply unknown tid %llu from osd%d\n", tid,
2816                      osd->o_osd);
2817                 goto out;
2818         }
2819
2820         if (req->r_reply->con)
2821                 dout("%s revoking msg %p from old con %p\n", __func__,
2822                      req->r_reply, req->r_reply->con);
2823         ceph_msg_revoke_incoming(req->r_reply);
2824
2825         if (front_len > req->r_reply->front_alloc_len) {
2826                 pr_warn("get_reply front %d > preallocated %d (%u#%llu)\n",
2827                         front_len, req->r_reply->front_alloc_len,
2828                         (unsigned int)con->peer_name.type,
2829                         le64_to_cpu(con->peer_name.num));
2830                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front_len, GFP_NOFS,
2831                                  false);
2832                 if (!m)
2833                         goto out;
2834                 ceph_msg_put(req->r_reply);
2835                 req->r_reply = m;
2836         }
2837         m = ceph_msg_get(req->r_reply);
2838
2839         if (data_len > 0) {
2840                 struct ceph_osd_data *osd_data;
2841
2842                 /*
2843                  * XXX This is assuming there is only one op containing
2844                  * XXX page data.  Probably OK for reads, but this
2845                  * XXX ought to be done more generally.
2846                  */
2847                 osd_data = osd_req_op_extent_osd_data(req, 0);
2848                 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
2849                         if (osd_data->pages &&
2850                                 unlikely(osd_data->length < data_len)) {
2851
2852                                 pr_warn("tid %lld reply has %d bytes we had only %llu bytes ready\n",
2853                                         tid, data_len, osd_data->length);
2854                                 *skip = 1;
2855                                 ceph_msg_put(m);
2856                                 m = NULL;
2857                                 goto out;
2858                         }
2859                 }
2860         }
2861         *skip = 0;
2862         dout("get_reply tid %lld %p\n", tid, m);
2863
2864 out:
2865         mutex_unlock(&osdc->request_mutex);
2866         return m;
2867
2868 }
2869
2870 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2871                                   struct ceph_msg_header *hdr,
2872                                   int *skip)
2873 {
2874         struct ceph_osd *osd = con->private;
2875         int type = le16_to_cpu(hdr->type);
2876         int front = le32_to_cpu(hdr->front_len);
2877
2878         *skip = 0;
2879         switch (type) {
2880         case CEPH_MSG_OSD_MAP:
2881         case CEPH_MSG_WATCH_NOTIFY:
2882                 return ceph_msg_new(type, front, GFP_NOFS, false);
2883         case CEPH_MSG_OSD_OPREPLY:
2884                 return get_reply(con, hdr, skip);
2885         default:
2886                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2887                         osd->o_osd);
2888                 *skip = 1;
2889                 return NULL;
2890         }
2891 }
2892
2893 /*
2894  * Wrappers to refcount containing ceph_osd struct
2895  */
2896 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2897 {
2898         struct ceph_osd *osd = con->private;
2899         if (get_osd(osd))
2900                 return con;
2901         return NULL;
2902 }
2903
2904 static void put_osd_con(struct ceph_connection *con)
2905 {
2906         struct ceph_osd *osd = con->private;
2907         put_osd(osd);
2908 }
2909
2910 /*
2911  * authentication
2912  */
2913 /*
2914  * Note: returned pointer is the address of a structure that's
2915  * managed separately.  Caller must *not* attempt to free it.
2916  */
2917 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2918                                         int *proto, int force_new)
2919 {
2920         struct ceph_osd *o = con->private;
2921         struct ceph_osd_client *osdc = o->o_osdc;
2922         struct ceph_auth_client *ac = osdc->client->monc.auth;
2923         struct ceph_auth_handshake *auth = &o->o_auth;
2924
2925         if (force_new && auth->authorizer) {
2926                 ceph_auth_destroy_authorizer(ac, auth->authorizer);
2927                 auth->authorizer = NULL;
2928         }
2929         if (!auth->authorizer) {
2930                 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2931                                                       auth);
2932                 if (ret)
2933                         return ERR_PTR(ret);
2934         } else {
2935                 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2936                                                      auth);
2937                 if (ret)
2938                         return ERR_PTR(ret);
2939         }
2940         *proto = ac->protocol;
2941
2942         return auth;
2943 }
2944
2945
2946 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2947 {
2948         struct ceph_osd *o = con->private;
2949         struct ceph_osd_client *osdc = o->o_osdc;
2950         struct ceph_auth_client *ac = osdc->client->monc.auth;
2951
2952         return ceph_auth_verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2953 }
2954
2955 static int invalidate_authorizer(struct ceph_connection *con)
2956 {
2957         struct ceph_osd *o = con->private;
2958         struct ceph_osd_client *osdc = o->o_osdc;
2959         struct ceph_auth_client *ac = osdc->client->monc.auth;
2960
2961         ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2962         return ceph_monc_validate_auth(&osdc->client->monc);
2963 }
2964
2965 static int sign_message(struct ceph_connection *con, struct ceph_msg *msg)
2966 {
2967         struct ceph_osd *o = con->private;
2968         struct ceph_auth_handshake *auth = &o->o_auth;
2969         return ceph_auth_sign_message(auth, msg);
2970 }
2971
2972 static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg)
2973 {
2974         struct ceph_osd *o = con->private;
2975         struct ceph_auth_handshake *auth = &o->o_auth;
2976         return ceph_auth_check_message_signature(auth, msg);
2977 }
2978
2979 static const struct ceph_connection_operations osd_con_ops = {
2980         .get = get_osd_con,
2981         .put = put_osd_con,
2982         .dispatch = dispatch,
2983         .get_authorizer = get_authorizer,
2984         .verify_authorizer_reply = verify_authorizer_reply,
2985         .invalidate_authorizer = invalidate_authorizer,
2986         .alloc_msg = alloc_msg,
2987         .sign_message = sign_message,
2988         .check_message_signature = check_message_signature,
2989         .fault = osd_reset,
2990 };