ceph/src/objclass/class_api.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "common/config.h"
   5 #include "common/debug.h"
   6
   7 #include "objclass/objclass.h"
   8 #include "osd/PrimaryLogPG.h"
   9 #include "osd/osd_types.h"
  10
  11 #include "osd/ClassHandler.h"
  12
  13 #include "auth/Crypto.h"
  14 #include "common/armor.h"
  15
  16 static constexpr int dout_subsys = ceph_subsys_objclass;
  17
  18 static ClassHandler *ch;
  19
  20 void cls_initialize(ClassHandler *h)
  21 {
  22   ch = h;
  23 }
  24
  25 void cls_finalize()
  26 {
  27   ch = NULL;
  28 }
  29
  30
  31 void *cls_alloc(size_t size)
  32 {
  33   return malloc(size);
  34 }
  35
  36 void cls_free(void *p)
  37 {
  38   free(p);
  39 }
  40
  41 int cls_register(const char *name, cls_handle_t *handle)
  42 {
  43   ClassHandler::ClassData *cls = ch->register_class(name);
  44   *handle = (cls_handle_t)cls;
  45   return (cls != NULL);
  46 }
  47
  48 int cls_unregister(cls_handle_t handle)
  49 {
  50   ClassHandler::ClassData *cls = (ClassHandler::ClassData *)handle;
  51   ch->unregister_class(cls);
  52   return 1;
  53 }
  54
  55 int cls_register_method(cls_handle_t hclass, const char *method,
  56                         int flags,
  57                         cls_method_call_t class_call, cls_method_handle_t *handle)
  58 {
  59   if (!(flags & (CLS_METHOD_RD | CLS_METHOD_WR)))
  60     return -EINVAL;
  61   ClassHandler::ClassData *cls = (ClassHandler::ClassData *)hclass;
  62   cls_method_handle_t hmethod =(cls_method_handle_t)cls->register_method(method, flags, class_call);
  63   if (handle)
  64     *handle = hmethod;
  65   return (hmethod != NULL);
  66 }
  67
  68 int cls_register_cxx_method(cls_handle_t hclass, const char *method,
  69                             int flags,
  70                             cls_method_cxx_call_t class_call, cls_method_handle_t *handle)
  71 {
  72   ClassHandler::ClassData *cls = (ClassHandler::ClassData *)hclass;
  73   cls_method_handle_t hmethod = (cls_method_handle_t)cls->register_cxx_method(method, flags, class_call);
  74   if (handle)
  75     *handle = hmethod;
  76   return (hmethod != NULL);
  77 }
  78
  79 int cls_unregister_method(cls_method_handle_t handle)
  80 {
  81   ClassHandler::ClassMethod *method = (ClassHandler::ClassMethod *)handle;
  82   method->unregister();
  83   return 1;
  84 }
  85
  86 int cls_register_cxx_filter(cls_handle_t hclass,
  87                             const std::string &filter_name,
  88                             cls_cxx_filter_factory_t fn,
  89                             cls_filter_handle_t *handle)
  90 {
  91   ClassHandler::ClassData *cls = (ClassHandler::ClassData *)hclass;
  92   cls_filter_handle_t hfilter = (cls_filter_handle_t)cls->register_cxx_filter(filter_name, fn);
  93   if (handle) {
  94     *handle = hfilter;
  95   }
  96   return (hfilter != NULL);
  97 }
  98
  99 void cls_unregister_filter(cls_filter_handle_t handle)
 100 {
 101   ClassHandler::ClassFilter *filter = (ClassHandler::ClassFilter *)handle;
 102   filter->unregister();
 103 }
 104
 105 int cls_call(cls_method_context_t hctx, const char *cls, const char *method,
 106                                  char *indata, int datalen,
 107                                  char **outdata, int *outdatalen)
 108 {
 109   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 110   bufferlist idata;
 111   vector<OSDOp> nops(1);
 112   OSDOp& op = nops[0];
 113   int r;
 114
 115   op.op.op = CEPH_OSD_OP_CALL;
 116   op.op.cls.class_len = strlen(cls);
 117   op.op.cls.method_len = strlen(method);
 118   op.op.cls.indata_len = datalen;
 119   op.indata.append(cls, op.op.cls.class_len);
 120   op.indata.append(method, op.op.cls.method_len);
 121   op.indata.append(indata, datalen);
 122   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 123   if (r < 0)
 124     return r;
 125
 126   *outdata = (char *)malloc(op.outdata.length());
 127   if (!*outdata)
 128     return -ENOMEM;
 129   memcpy(*outdata, op.outdata.c_str(), op.outdata.length());
 130   *outdatalen = op.outdata.length();
 131
 132   return r;
 133 }
 134
 135 int cls_getxattr(cls_method_context_t hctx, const char *name,
 136                                  char **outdata, int *outdatalen)
 137 {
 138   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 139   bufferlist name_data;
 140   vector<OSDOp> nops(1);
 141   OSDOp& op = nops[0];
 142   int r;
 143
 144   op.op.op = CEPH_OSD_OP_GETXATTR;
 145   op.indata.append(name);
 146   op.op.xattr.name_len = strlen(name);
 147   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 148   if (r < 0)
 149     return r;
 150
 151   *outdata = (char *)malloc(op.outdata.length());
 152   if (!*outdata)
 153     return -ENOMEM;
 154   memcpy(*outdata, op.outdata.c_str(), op.outdata.length());
 155   *outdatalen = op.outdata.length();
 156
 157   return r;
 158 }
 159
 160 int cls_setxattr(cls_method_context_t hctx, const char *name,
 161                                  const char *value, int val_len)
 162 {
 163   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 164   bufferlist name_data;
 165   vector<OSDOp> nops(1);
 166   OSDOp& op = nops[0];
 167   int r;
 168
 169   op.op.op = CEPH_OSD_OP_SETXATTR;
 170   op.indata.append(name);
 171   op.indata.append(value);
 172   op.op.xattr.name_len = strlen(name);
 173   op.op.xattr.value_len = val_len;
 174   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 175
 176   return r;
 177 }
 178
 179 int cls_read(cls_method_context_t hctx, int ofs, int len,
 180                                  char **outdata, int *outdatalen)
 181 {
 182   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 183   vector<OSDOp> ops(1);
 184   ops[0].op.op = CEPH_OSD_OP_SYNC_READ;
 185   ops[0].op.extent.offset = ofs;
 186   ops[0].op.extent.length = len;
 187   int r = (*pctx)->pg->do_osd_ops(*pctx, ops);
 188   if (r < 0)
 189     return r;
 190
 191   *outdata = (char *)malloc(ops[0].outdata.length());
 192   if (!*outdata)
 193     return -ENOMEM;
 194   memcpy(*outdata, ops[0].outdata.c_str(), ops[0].outdata.length());
 195   *outdatalen = ops[0].outdata.length();
 196
 197   return *outdatalen;
 198 }
 199
 200 int cls_get_request_origin(cls_method_context_t hctx, entity_inst_t *origin)
 201 {
 202   PrimaryLogPG::OpContext **pctx = static_cast<PrimaryLogPG::OpContext **>(hctx);
 203   *origin = (*pctx)->op->get_req()->get_orig_source_inst();
 204   return 0;
 205 }
 206
 207 int cls_cxx_create(cls_method_context_t hctx, bool exclusive)
 208 {
 209   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 210   vector<OSDOp> ops(1);
 211   ops[0].op.op = CEPH_OSD_OP_CREATE;
 212   ops[0].op.flags = (exclusive ? CEPH_OSD_OP_FLAG_EXCL : 0);
 213   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 214 }
 215
 216 int cls_cxx_remove(cls_method_context_t hctx)
 217 {
 218   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 219   vector<OSDOp> ops(1);
 220   ops[0].op.op = CEPH_OSD_OP_DELETE;
 221   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 222 }
 223
 224 int cls_cxx_stat(cls_method_context_t hctx, uint64_t *size, time_t *mtime)
 225 {
 226   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 227   vector<OSDOp> ops(1);
 228   int ret;
 229   ops[0].op.op = CEPH_OSD_OP_STAT;
 230   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 231   if (ret < 0)
 232     return ret;
 233   bufferlist::iterator iter = ops[0].outdata.begin();
 234   utime_t ut;
 235   uint64_t s;
 236   try {
 237     ::decode(s, iter);
 238     ::decode(ut, iter);
 239   } catch (buffer::error& err) {
 240     return -EIO;
 241   }
 242   if (size)
 243     *size = s;
 244   if (mtime)
 245     *mtime = ut.sec();
 246   return 0;
 247 }
 248
 249 int cls_cxx_stat2(cls_method_context_t hctx, uint64_t *size, ceph::real_time *mtime)
 250 {
 251   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 252   vector<OSDOp> ops(1);
 253   int ret;
 254   ops[0].op.op = CEPH_OSD_OP_STAT;
 255   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 256   if (ret < 0)
 257     return ret;
 258   bufferlist::iterator iter = ops[0].outdata.begin();
 259   real_time ut;
 260   uint64_t s;
 261   try {
 262     ::decode(s, iter);
 263     ::decode(ut, iter);
 264   } catch (buffer::error& err) {
 265     return -EIO;
 266   }
 267   if (size)
 268     *size = s;
 269   if (mtime)
 270     *mtime = ut;
 271   return 0;
 272 }
 273
 274 int cls_cxx_read(cls_method_context_t hctx, int ofs, int len, bufferlist *outbl)
 275 {
 276   return cls_cxx_read2(hctx, ofs, len, outbl, 0);
 277 }
 278
 279 int cls_cxx_read2(cls_method_context_t hctx, int ofs, int len,
 280                   bufferlist *outbl, uint32_t op_flags)
 281 {
 282   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 283   vector<OSDOp> ops(1);
 284   int ret;
 285   ops[0].op.op = CEPH_OSD_OP_SYNC_READ;
 286   ops[0].op.extent.offset = ofs;
 287   ops[0].op.extent.length = len;
 288   ops[0].op.flags = op_flags;
 289   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 290   if (ret < 0)
 291     return ret;
 292   outbl->claim(ops[0].outdata);
 293   return outbl->length();
 294 }
 295
 296 int cls_cxx_write(cls_method_context_t hctx, int ofs, int len, bufferlist *inbl)
 297 {
 298   return cls_cxx_write2(hctx, ofs, len, inbl, 0);
 299 }
 300
 301 int cls_cxx_write2(cls_method_context_t hctx, int ofs, int len,
 302                    bufferlist *inbl, uint32_t op_flags)
 303 {
 304   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 305   vector<OSDOp> ops(1);
 306   ops[0].op.op = CEPH_OSD_OP_WRITE;
 307   ops[0].op.extent.offset = ofs;
 308   ops[0].op.extent.length = len;
 309   ops[0].op.flags = op_flags;
 310   ops[0].indata = *inbl;
 311   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 312 }
 313
 314 int cls_cxx_write_full(cls_method_context_t hctx, bufferlist *inbl)
 315 {
 316   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 317   vector<OSDOp> ops(1);
 318   ops[0].op.op = CEPH_OSD_OP_WRITEFULL;
 319   ops[0].op.extent.offset = 0;
 320   ops[0].op.extent.length = inbl->length();
 321   ops[0].indata = *inbl;
 322   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 323 }
 324
 325 int cls_cxx_replace(cls_method_context_t hctx, int ofs, int len, bufferlist *inbl)
 326 {
 327   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 328   vector<OSDOp> ops(2);
 329   ops[0].op.op = CEPH_OSD_OP_TRUNCATE;
 330   ops[0].op.extent.offset = 0;
 331   ops[0].op.extent.length = 0;
 332   ops[1].op.op = CEPH_OSD_OP_WRITE;
 333   ops[1].op.extent.offset = ofs;
 334   ops[1].op.extent.length = len;
 335   ops[1].indata = *inbl;
 336   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 337 }
 338
 339 int cls_cxx_getxattr(cls_method_context_t hctx, const char *name,
 340                      bufferlist *outbl)
 341 {
 342   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 343   bufferlist name_data;
 344   vector<OSDOp> nops(1);
 345   OSDOp& op = nops[0];
 346   int r;
 347
 348   op.op.op = CEPH_OSD_OP_GETXATTR;
 349   op.indata.append(name);
 350   op.op.xattr.name_len = strlen(name);
 351   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 352   if (r < 0)
 353     return r;
 354
 355   outbl->claim(op.outdata);
 356   return outbl->length();
 357 }
 358
 359 int cls_cxx_getxattrs(cls_method_context_t hctx, map<string, bufferlist> *attrset)
 360 {
 361   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 362   vector<OSDOp> nops(1);
 363   OSDOp& op = nops[0];
 364   int r;
 365
 366   op.op.op = CEPH_OSD_OP_GETXATTRS;
 367   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 368   if (r < 0)
 369     return r;
 370
 371   bufferlist::iterator iter = op.outdata.begin();
 372   try {
 373     ::decode(*attrset, iter);
 374   } catch (buffer::error& err) {
 375     return -EIO;
 376   }
 377   return 0;
 378 }
 379
 380 int cls_cxx_setxattr(cls_method_context_t hctx, const char *name,
 381                      bufferlist *inbl)
 382 {
 383   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 384   bufferlist name_data;
 385   vector<OSDOp> nops(1);
 386   OSDOp& op = nops[0];
 387   int r;
 388
 389   op.op.op = CEPH_OSD_OP_SETXATTR;
 390   op.indata.append(name);
 391   op.indata.append(*inbl);
 392   op.op.xattr.name_len = strlen(name);
 393   op.op.xattr.value_len = inbl->length();
 394   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 395
 396   return r;
 397 }
 398
 399 int cls_cxx_snap_revert(cls_method_context_t hctx, snapid_t snapid)
 400 {
 401   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 402   vector<OSDOp> ops(1);
 403   ops[0].op.op = CEPH_OSD_OP_ROLLBACK;
 404   ops[0].op.snap.snapid = snapid;
 405   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 406 }
 407
 408 int cls_cxx_map_get_all_vals(cls_method_context_t hctx, map<string, bufferlist>* vals,
 409                              bool *more)
 410 {
 411   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 412   vector<OSDOp> ops(1);
 413   OSDOp& op = ops[0];
 414   int ret;
 415
 416   string start_after;
 417   string filter_prefix;
 418   uint64_t max = (uint64_t)-1;
 419
 420   ::encode(start_after, op.indata);
 421   ::encode(max, op.indata);
 422   ::encode(filter_prefix, op.indata);
 423
 424   op.op.op = CEPH_OSD_OP_OMAPGETVALS;
 425
 426   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 427   if (ret < 0)
 428     return ret;
 429
 430   bufferlist::iterator iter = op.outdata.begin();
 431   try {
 432     ::decode(*vals, iter);
 433     ::decode(*more, iter);
 434   } catch (buffer::error& err) {
 435     return -EIO;
 436   }
 437   return vals->size();
 438 }
 439
 440 int cls_cxx_map_get_keys(cls_method_context_t hctx, const string &start_obj,
 441                          uint64_t max_to_get, set<string> *keys,
 442                          bool *more)
 443 {
 444   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 445   vector<OSDOp> ops(1);
 446   OSDOp& op = ops[0];
 447   int ret;
 448
 449   ::encode(start_obj, op.indata);
 450   ::encode(max_to_get, op.indata);
 451
 452   op.op.op = CEPH_OSD_OP_OMAPGETKEYS;
 453
 454   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 455   if (ret < 0)
 456     return ret;
 457
 458   bufferlist::iterator iter = op.outdata.begin();
 459   try {
 460     ::decode(*keys, iter);
 461     ::decode(*more, iter);
 462   } catch (buffer::error& err) {
 463     return -EIO;
 464   }
 465   return keys->size();
 466 }
 467
 468 int cls_cxx_map_get_vals(cls_method_context_t hctx, const string &start_obj,
 469                          const string &filter_prefix, uint64_t max_to_get,
 470                          map<string, bufferlist> *vals, bool *more)
 471 {
 472   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 473   vector<OSDOp> ops(1);
 474   OSDOp& op = ops[0];
 475   int ret;
 476
 477   ::encode(start_obj, op.indata);
 478   ::encode(max_to_get, op.indata);
 479   ::encode(filter_prefix, op.indata);
 480
 481   op.op.op = CEPH_OSD_OP_OMAPGETVALS;
 482
 483   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 484   if (ret < 0)
 485     return ret;
 486
 487   bufferlist::iterator iter = op.outdata.begin();
 488   try {
 489     ::decode(*vals, iter);
 490     ::decode(*more, iter);
 491   } catch (buffer::error& err) {
 492     return -EIO;
 493   }
 494   return vals->size();
 495 }
 496
 497 int cls_cxx_map_read_header(cls_method_context_t hctx, bufferlist *outbl)
 498 {
 499   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 500   vector<OSDOp> ops(1);
 501   OSDOp& op = ops[0];
 502   int ret;
 503   op.op.op = CEPH_OSD_OP_OMAPGETHEADER;
 504   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 505   if (ret < 0)
 506     return ret;
 507
 508   outbl->claim(op.outdata);
 509
 510   return 0;
 511 }
 512
 513 int cls_cxx_map_get_val(cls_method_context_t hctx, const string &key,
 514                         bufferlist *outbl)
 515 {
 516   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 517   vector<OSDOp> ops(1);
 518   OSDOp& op = ops[0];
 519   int ret;
 520
 521   set<string> k;
 522   k.insert(key);
 523   ::encode(k, op.indata);
 524
 525   op.op.op = CEPH_OSD_OP_OMAPGETVALSBYKEYS;
 526   ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
 527   if (ret < 0)
 528     return ret;
 529
 530   bufferlist::iterator iter = op.outdata.begin();
 531   try {
 532     map<string, bufferlist> m;
 533
 534     ::decode(m, iter);
 535     map<string, bufferlist>::iterator iter = m.begin();
 536     if (iter == m.end())
 537       return -ENOENT;
 538
 539     *outbl = iter->second;
 540   } catch (buffer::error& e) {
 541     return -EIO;
 542   }
 543   return 0;
 544 }
 545
 546 int cls_cxx_map_set_val(cls_method_context_t hctx, const string &key,
 547                         bufferlist *inbl)
 548 {
 549   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 550   vector<OSDOp> ops(1);
 551   OSDOp& op = ops[0];
 552   bufferlist& update_bl = op.indata;
 553   map<string, bufferlist> m;
 554   m[key] = *inbl;
 555   ::encode(m, update_bl);
 556
 557   op.op.op = CEPH_OSD_OP_OMAPSETVALS;
 558
 559   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 560 }
 561
 562 int cls_cxx_map_set_vals(cls_method_context_t hctx,
 563                          const std::map<string, bufferlist> *map)
 564 {
 565   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 566   vector<OSDOp> ops(1);
 567   OSDOp& op = ops[0];
 568   bufferlist& update_bl = op.indata;
 569   ::encode(*map, update_bl);
 570
 571   op.op.op = CEPH_OSD_OP_OMAPSETVALS;
 572
 573   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 574 }
 575
 576 int cls_cxx_map_clear(cls_method_context_t hctx)
 577 {
 578   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 579   vector<OSDOp> ops(1);
 580   OSDOp& op = ops[0];
 581
 582   op.op.op = CEPH_OSD_OP_OMAPCLEAR;
 583
 584   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 585 }
 586
 587 int cls_cxx_map_write_header(cls_method_context_t hctx, bufferlist *inbl)
 588 {
 589   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 590   vector<OSDOp> ops(1);
 591   OSDOp& op = ops[0];
 592   op.indata.claim(*inbl);
 593
 594   op.op.op = CEPH_OSD_OP_OMAPSETHEADER;
 595
 596   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 597 }
 598
 599 int cls_cxx_map_remove_key(cls_method_context_t hctx, const string &key)
 600 {
 601   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 602   vector<OSDOp> ops(1);
 603   OSDOp& op = ops[0];
 604   bufferlist& update_bl = op.indata;
 605   set<string> to_rm;
 606   to_rm.insert(key);
 607
 608   ::encode(to_rm, update_bl);
 609
 610   op.op.op = CEPH_OSD_OP_OMAPRMKEYS;
 611
 612   return (*pctx)->pg->do_osd_ops(*pctx, ops);
 613 }
 614
 615 int cls_cxx_list_watchers(cls_method_context_t hctx,
 616                           obj_list_watch_response_t *watchers)
 617 {
 618   PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
 619   vector<OSDOp> nops(1);
 620   OSDOp& op = nops[0];
 621   int r;
 622
 623   op.op.op = CEPH_OSD_OP_LIST_WATCHERS;
 624   r = (*pctx)->pg->do_osd_ops(*pctx, nops);
 625   if (r < 0)
 626     return r;
 627
 628   bufferlist::iterator iter = op.outdata.begin();
 629   try {
 630     ::decode(*watchers, iter);
 631   } catch (buffer::error& err) {
 632     return -EIO;
 633   }
 634   return 0;
 635 }
 636
 637 int cls_gen_random_bytes(char *buf, int size)
 638 {
 639   return get_random_bytes(buf, size);
 640 }
 641
 642 int cls_gen_rand_base64(char *dest, int size) /* size should be the required string size + 1 */
 643 {
 644   char buf[size];
 645   char tmp_dest[size + 4]; /* so that there's space for the extra '=' characters, and some */
 646   int ret;
 647
 648   ret = cls_gen_random_bytes(buf, sizeof(buf));
 649   if (ret < 0) {
 650     lgeneric_derr(ch->cct) << "cannot get random bytes: " << ret << dendl;
 651     return -1;
 652   }
 653
 654   ret = ceph_armor(tmp_dest, &tmp_dest[sizeof(tmp_dest)],
 655                    (const char *)buf, ((const char *)buf) + ((size - 1) * 3 + 4 - 1) / 4);
 656   if (ret < 0) {
 657     lgeneric_derr(ch->cct) << "ceph_armor failed" << dendl;
 658     return -1;
 659   }
 660   tmp_dest[ret] = '\0';
 661   memcpy(dest, tmp_dest, size);
 662   dest[size-1] = '\0';
 663
 664   return 0;
 665 }
 666
 667 uint64_t cls_current_version(cls_method_context_t hctx)
 668 {
 669   PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
 670
 671   return ctx->pg->info.last_user_version;
 672 }
 673
 674
 675 int cls_current_subop_num(cls_method_context_t hctx)
 676 {
 677   PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
 678
 679   return ctx->current_osd_subop_num;
 680 }
 681
 682 uint64_t cls_get_features(cls_method_context_t hctx)
 683 {
 684   PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
 685   return ctx->pg->get_osdmap()->get_up_osd_features();
 686 }
 687
 688 uint64_t cls_get_client_features(cls_method_context_t hctx)
 689 {
 690   PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
 691   return ctx->op->get_req()->get_connection()->get_features();
 692 }
 693
 694 void cls_cxx_subop_version(cls_method_context_t hctx, string *s)
 695 {
 696   if (!s)
 697     return;
 698
 699   char buf[32];
 700   uint64_t ver = cls_current_version(hctx);
 701   int subop_num = cls_current_subop_num(hctx);
 702   snprintf(buf, sizeof(buf), "%lld.%d", (long long)ver, subop_num);
 703
 704   *s = buf;
 705 }
 706
 707 int cls_log(int level, const char *format, ...)
 708 {
 709    int size = 256;
 710    va_list ap;
 711    while (1) {
 712      char buf[size];
 713      va_start(ap, format);
 714      int n = vsnprintf(buf, size, format, ap);
 715      va_end(ap);
 716 #define MAX_SIZE 8196
 717      if ((n > -1 && n < size) || size > MAX_SIZE) {
 718        ldout(ch->cct, level) << buf << dendl;
 719        return n;
 720      }
 721      size *= 2;
 722    }
 723 }