X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fobjclass%2Fclass_api.cc;fp=src%2Fceph%2Fsrc%2Fobjclass%2Fclass_api.cc;h=cb8aa0677f8c215e84374b9da1229f1f30a114e8;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/objclass/class_api.cc b/src/ceph/src/objclass/class_api.cc
new file mode 100644
index 0000000..cb8aa06
--- /dev/null
+++ b/src/ceph/src/objclass/class_api.cc
@@ -0,0 +1,723 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "common/config.h"
+#include "common/debug.h"
+
+#include "objclass/objclass.h"
+#include "osd/PrimaryLogPG.h"
+#include "osd/osd_types.h"
+
+#include "osd/ClassHandler.h"
+
+#include "auth/Crypto.h"
+#include "common/armor.h"
+
+static constexpr int dout_subsys = ceph_subsys_objclass;
+
+static ClassHandler *ch;
+
+void cls_initialize(ClassHandler *h)
+{
+  ch = h;
+}
+
+void cls_finalize()
+{
+  ch = NULL;
+}
+
+
+void *cls_alloc(size_t size)
+{
+  return malloc(size);
+}
+
+void cls_free(void *p)
+{
+  free(p);
+}
+
+int cls_register(const char *name, cls_handle_t *handle)
+{
+  ClassHandler::ClassData *cls = ch->register_class(name);
+  *handle = (cls_handle_t)cls;
+  return (cls != NULL);
+}
+
+int cls_unregister(cls_handle_t handle)
+{
+  ClassHandler::ClassData *cls = (ClassHandler::ClassData *)handle;
+  ch->unregister_class(cls);
+  return 1;
+}
+
+int cls_register_method(cls_handle_t hclass, const char *method,
+                        int flags,
+                        cls_method_call_t class_call, cls_method_handle_t *handle)
+{
+  if (!(flags & (CLS_METHOD_RD | CLS_METHOD_WR)))
+    return -EINVAL;
+  ClassHandler::ClassData *cls = (ClassHandler::ClassData *)hclass;
+  cls_method_handle_t hmethod =(cls_method_handle_t)cls->register_method(method, flags, class_call);
+  if (handle)
+    *handle = hmethod;
+  return (hmethod != NULL);
+}
+
+int cls_register_cxx_method(cls_handle_t hclass, const char *method,
+                            int flags,
+			    cls_method_cxx_call_t class_call, cls_method_handle_t *handle)
+{
+  ClassHandler::ClassData *cls = (ClassHandler::ClassData *)hclass;
+  cls_method_handle_t hmethod = (cls_method_handle_t)cls->register_cxx_method(method, flags, class_call);
+  if (handle)
+    *handle = hmethod;
+  return (hmethod != NULL);
+}
+
+int cls_unregister_method(cls_method_handle_t handle)
+{
+  ClassHandler::ClassMethod *method = (ClassHandler::ClassMethod *)handle;
+  method->unregister();
+  return 1;
+}
+
+int cls_register_cxx_filter(cls_handle_t hclass,
+                            const std::string &filter_name,
+                            cls_cxx_filter_factory_t fn,
+                            cls_filter_handle_t *handle)
+{
+  ClassHandler::ClassData *cls = (ClassHandler::ClassData *)hclass;
+  cls_filter_handle_t hfilter = (cls_filter_handle_t)cls->register_cxx_filter(filter_name, fn);
+  if (handle) {
+    *handle = hfilter;
+  }
+  return (hfilter != NULL);
+}
+
+void cls_unregister_filter(cls_filter_handle_t handle)
+{
+  ClassHandler::ClassFilter *filter = (ClassHandler::ClassFilter *)handle;
+  filter->unregister();
+}
+
+int cls_call(cls_method_context_t hctx, const char *cls, const char *method,
+                                 char *indata, int datalen,
+                                 char **outdata, int *outdatalen)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  bufferlist idata;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_CALL;
+  op.op.cls.class_len = strlen(cls);
+  op.op.cls.method_len = strlen(method);
+  op.op.cls.indata_len = datalen;
+  op.indata.append(cls, op.op.cls.class_len);
+  op.indata.append(method, op.op.cls.method_len);
+  op.indata.append(indata, datalen);
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+  if (r < 0)
+    return r;
+
+  *outdata = (char *)malloc(op.outdata.length());
+  if (!*outdata)
+    return -ENOMEM;
+  memcpy(*outdata, op.outdata.c_str(), op.outdata.length());
+  *outdatalen = op.outdata.length();
+
+  return r;
+}
+
+int cls_getxattr(cls_method_context_t hctx, const char *name,
+                                 char **outdata, int *outdatalen)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  bufferlist name_data;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_GETXATTR;
+  op.indata.append(name);
+  op.op.xattr.name_len = strlen(name);
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+  if (r < 0)
+    return r;
+
+  *outdata = (char *)malloc(op.outdata.length());
+  if (!*outdata)
+    return -ENOMEM;
+  memcpy(*outdata, op.outdata.c_str(), op.outdata.length());
+  *outdatalen = op.outdata.length();
+
+  return r;
+}
+
+int cls_setxattr(cls_method_context_t hctx, const char *name,
+                                 const char *value, int val_len)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  bufferlist name_data;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_SETXATTR;
+  op.indata.append(name);
+  op.indata.append(value);
+  op.op.xattr.name_len = strlen(name);
+  op.op.xattr.value_len = val_len;
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+
+  return r;
+}
+
+int cls_read(cls_method_context_t hctx, int ofs, int len,
+                                 char **outdata, int *outdatalen)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  ops[0].op.op = CEPH_OSD_OP_SYNC_READ;
+  ops[0].op.extent.offset = ofs;
+  ops[0].op.extent.length = len;
+  int r = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (r < 0)
+    return r;
+
+  *outdata = (char *)malloc(ops[0].outdata.length());
+  if (!*outdata)
+    return -ENOMEM;
+  memcpy(*outdata, ops[0].outdata.c_str(), ops[0].outdata.length());
+  *outdatalen = ops[0].outdata.length();
+
+  return *outdatalen;
+}
+
+int cls_get_request_origin(cls_method_context_t hctx, entity_inst_t *origin)
+{
+  PrimaryLogPG::OpContext **pctx = static_cast<PrimaryLogPG::OpContext **>(hctx);
+  *origin = (*pctx)->op->get_req()->get_orig_source_inst();
+  return 0;
+}
+
+int cls_cxx_create(cls_method_context_t hctx, bool exclusive)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  ops[0].op.op = CEPH_OSD_OP_CREATE;
+  ops[0].op.flags = (exclusive ? CEPH_OSD_OP_FLAG_EXCL : 0);
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_remove(cls_method_context_t hctx)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  ops[0].op.op = CEPH_OSD_OP_DELETE;
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_stat(cls_method_context_t hctx, uint64_t *size, time_t *mtime)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  int ret;
+  ops[0].op.op = CEPH_OSD_OP_STAT;
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+  bufferlist::iterator iter = ops[0].outdata.begin();
+  utime_t ut;
+  uint64_t s;
+  try {
+    ::decode(s, iter);
+    ::decode(ut, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  if (size)
+    *size = s;
+  if (mtime)
+    *mtime = ut.sec();
+  return 0;
+}
+
+int cls_cxx_stat2(cls_method_context_t hctx, uint64_t *size, ceph::real_time *mtime)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  int ret;
+  ops[0].op.op = CEPH_OSD_OP_STAT;
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+  bufferlist::iterator iter = ops[0].outdata.begin();
+  real_time ut;
+  uint64_t s;
+  try {
+    ::decode(s, iter);
+    ::decode(ut, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  if (size)
+    *size = s;
+  if (mtime)
+    *mtime = ut;
+  return 0;
+}
+
+int cls_cxx_read(cls_method_context_t hctx, int ofs, int len, bufferlist *outbl)
+{
+  return cls_cxx_read2(hctx, ofs, len, outbl, 0);
+}
+
+int cls_cxx_read2(cls_method_context_t hctx, int ofs, int len,
+                  bufferlist *outbl, uint32_t op_flags)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  int ret;
+  ops[0].op.op = CEPH_OSD_OP_SYNC_READ;
+  ops[0].op.extent.offset = ofs;
+  ops[0].op.extent.length = len;
+  ops[0].op.flags = op_flags;
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+  outbl->claim(ops[0].outdata);
+  return outbl->length();
+}
+
+int cls_cxx_write(cls_method_context_t hctx, int ofs, int len, bufferlist *inbl)
+{
+  return cls_cxx_write2(hctx, ofs, len, inbl, 0);
+}
+
+int cls_cxx_write2(cls_method_context_t hctx, int ofs, int len,
+                   bufferlist *inbl, uint32_t op_flags)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  ops[0].op.op = CEPH_OSD_OP_WRITE;
+  ops[0].op.extent.offset = ofs;
+  ops[0].op.extent.length = len;
+  ops[0].op.flags = op_flags;
+  ops[0].indata = *inbl;
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_write_full(cls_method_context_t hctx, bufferlist *inbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  ops[0].op.op = CEPH_OSD_OP_WRITEFULL;
+  ops[0].op.extent.offset = 0;
+  ops[0].op.extent.length = inbl->length();
+  ops[0].indata = *inbl;
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_replace(cls_method_context_t hctx, int ofs, int len, bufferlist *inbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(2);
+  ops[0].op.op = CEPH_OSD_OP_TRUNCATE;
+  ops[0].op.extent.offset = 0;
+  ops[0].op.extent.length = 0;
+  ops[1].op.op = CEPH_OSD_OP_WRITE;
+  ops[1].op.extent.offset = ofs;
+  ops[1].op.extent.length = len;
+  ops[1].indata = *inbl;
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_getxattr(cls_method_context_t hctx, const char *name,
+                     bufferlist *outbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  bufferlist name_data;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_GETXATTR;
+  op.indata.append(name);
+  op.op.xattr.name_len = strlen(name);
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+  if (r < 0)
+    return r;
+
+  outbl->claim(op.outdata);
+  return outbl->length();
+}
+
+int cls_cxx_getxattrs(cls_method_context_t hctx, map<string, bufferlist> *attrset)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_GETXATTRS;
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+  if (r < 0)
+    return r;
+
+  bufferlist::iterator iter = op.outdata.begin();
+  try {
+    ::decode(*attrset, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  return 0;
+}
+
+int cls_cxx_setxattr(cls_method_context_t hctx, const char *name,
+                     bufferlist *inbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  bufferlist name_data;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_SETXATTR;
+  op.indata.append(name);
+  op.indata.append(*inbl);
+  op.op.xattr.name_len = strlen(name);
+  op.op.xattr.value_len = inbl->length();
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+
+  return r;
+}
+
+int cls_cxx_snap_revert(cls_method_context_t hctx, snapid_t snapid)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  ops[0].op.op = CEPH_OSD_OP_ROLLBACK;
+  ops[0].op.snap.snapid = snapid;
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_map_get_all_vals(cls_method_context_t hctx, map<string, bufferlist>* vals,
+                             bool *more)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  int ret;
+
+  string start_after;
+  string filter_prefix;
+  uint64_t max = (uint64_t)-1;
+
+  ::encode(start_after, op.indata);
+  ::encode(max, op.indata);
+  ::encode(filter_prefix, op.indata);
+
+  op.op.op = CEPH_OSD_OP_OMAPGETVALS;
+  
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+
+  bufferlist::iterator iter = op.outdata.begin();
+  try {
+    ::decode(*vals, iter);
+    ::decode(*more, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  return vals->size();
+}
+
+int cls_cxx_map_get_keys(cls_method_context_t hctx, const string &start_obj,
+			 uint64_t max_to_get, set<string> *keys,
+                         bool *more)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  int ret;
+
+  ::encode(start_obj, op.indata);
+  ::encode(max_to_get, op.indata);
+
+  op.op.op = CEPH_OSD_OP_OMAPGETKEYS;
+
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+
+  bufferlist::iterator iter = op.outdata.begin();
+  try {
+    ::decode(*keys, iter);
+    ::decode(*more, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  return keys->size();
+}
+
+int cls_cxx_map_get_vals(cls_method_context_t hctx, const string &start_obj,
+			 const string &filter_prefix, uint64_t max_to_get,
+			 map<string, bufferlist> *vals, bool *more)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  int ret;
+
+  ::encode(start_obj, op.indata);
+  ::encode(max_to_get, op.indata);
+  ::encode(filter_prefix, op.indata);
+
+  op.op.op = CEPH_OSD_OP_OMAPGETVALS;
+  
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+
+  bufferlist::iterator iter = op.outdata.begin();
+  try {
+    ::decode(*vals, iter);
+    ::decode(*more, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  return vals->size();
+}
+
+int cls_cxx_map_read_header(cls_method_context_t hctx, bufferlist *outbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  int ret;
+  op.op.op = CEPH_OSD_OP_OMAPGETHEADER;
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+
+  outbl->claim(op.outdata);
+
+  return 0;
+}
+
+int cls_cxx_map_get_val(cls_method_context_t hctx, const string &key,
+			bufferlist *outbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  int ret;
+
+  set<string> k;
+  k.insert(key);
+  ::encode(k, op.indata);
+
+  op.op.op = CEPH_OSD_OP_OMAPGETVALSBYKEYS;
+  ret = (*pctx)->pg->do_osd_ops(*pctx, ops);
+  if (ret < 0)
+    return ret;
+
+  bufferlist::iterator iter = op.outdata.begin();
+  try {
+    map<string, bufferlist> m;
+
+    ::decode(m, iter);
+    map<string, bufferlist>::iterator iter = m.begin();
+    if (iter == m.end())
+      return -ENOENT;
+
+    *outbl = iter->second;
+  } catch (buffer::error& e) {
+    return -EIO;
+  }
+  return 0;
+}
+
+int cls_cxx_map_set_val(cls_method_context_t hctx, const string &key,
+			bufferlist *inbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  bufferlist& update_bl = op.indata;
+  map<string, bufferlist> m;
+  m[key] = *inbl;
+  ::encode(m, update_bl);
+
+  op.op.op = CEPH_OSD_OP_OMAPSETVALS;
+
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_map_set_vals(cls_method_context_t hctx,
+			 const std::map<string, bufferlist> *map)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  bufferlist& update_bl = op.indata;
+  ::encode(*map, update_bl);
+
+  op.op.op = CEPH_OSD_OP_OMAPSETVALS;
+
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_map_clear(cls_method_context_t hctx)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+
+  op.op.op = CEPH_OSD_OP_OMAPCLEAR;
+
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_map_write_header(cls_method_context_t hctx, bufferlist *inbl)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  op.indata.claim(*inbl);
+
+  op.op.op = CEPH_OSD_OP_OMAPSETHEADER;
+
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_map_remove_key(cls_method_context_t hctx, const string &key)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> ops(1);
+  OSDOp& op = ops[0];
+  bufferlist& update_bl = op.indata;
+  set<string> to_rm;
+  to_rm.insert(key);
+
+  ::encode(to_rm, update_bl);
+
+  op.op.op = CEPH_OSD_OP_OMAPRMKEYS;
+
+  return (*pctx)->pg->do_osd_ops(*pctx, ops);
+}
+
+int cls_cxx_list_watchers(cls_method_context_t hctx,
+			  obj_list_watch_response_t *watchers)
+{
+  PrimaryLogPG::OpContext **pctx = (PrimaryLogPG::OpContext **)hctx;
+  vector<OSDOp> nops(1);
+  OSDOp& op = nops[0];
+  int r;
+
+  op.op.op = CEPH_OSD_OP_LIST_WATCHERS;
+  r = (*pctx)->pg->do_osd_ops(*pctx, nops);
+  if (r < 0)
+    return r;
+
+  bufferlist::iterator iter = op.outdata.begin();
+  try {
+    ::decode(*watchers, iter);
+  } catch (buffer::error& err) {
+    return -EIO;
+  }
+  return 0;
+}
+
+int cls_gen_random_bytes(char *buf, int size)
+{
+  return get_random_bytes(buf, size);
+}
+
+int cls_gen_rand_base64(char *dest, int size) /* size should be the required string size + 1 */
+{
+  char buf[size];
+  char tmp_dest[size + 4]; /* so that there's space for the extra '=' characters, and some */
+  int ret;
+
+  ret = cls_gen_random_bytes(buf, sizeof(buf));
+  if (ret < 0) {
+    lgeneric_derr(ch->cct) << "cannot get random bytes: " << ret << dendl;
+    return -1;
+  }
+
+  ret = ceph_armor(tmp_dest, &tmp_dest[sizeof(tmp_dest)],
+		   (const char *)buf, ((const char *)buf) + ((size - 1) * 3 + 4 - 1) / 4);
+  if (ret < 0) {
+    lgeneric_derr(ch->cct) << "ceph_armor failed" << dendl;
+    return -1;
+  }
+  tmp_dest[ret] = '\0';
+  memcpy(dest, tmp_dest, size);
+  dest[size-1] = '\0';
+
+  return 0;
+}
+
+uint64_t cls_current_version(cls_method_context_t hctx)
+{
+  PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
+
+  return ctx->pg->info.last_user_version;
+}
+
+
+int cls_current_subop_num(cls_method_context_t hctx)
+{
+  PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
+
+  return ctx->current_osd_subop_num;
+}
+
+uint64_t cls_get_features(cls_method_context_t hctx)
+{
+  PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
+  return ctx->pg->get_osdmap()->get_up_osd_features();
+}
+
+uint64_t cls_get_client_features(cls_method_context_t hctx)
+{
+  PrimaryLogPG::OpContext *ctx = *(PrimaryLogPG::OpContext **)hctx;
+  return ctx->op->get_req()->get_connection()->get_features();
+}
+
+void cls_cxx_subop_version(cls_method_context_t hctx, string *s)
+{
+  if (!s)
+    return;
+
+  char buf[32];
+  uint64_t ver = cls_current_version(hctx);
+  int subop_num = cls_current_subop_num(hctx);
+  snprintf(buf, sizeof(buf), "%lld.%d", (long long)ver, subop_num);
+
+  *s = buf;
+}
+
+int cls_log(int level, const char *format, ...)
+{
+   int size = 256;
+   va_list ap;
+   while (1) {
+     char buf[size];
+     va_start(ap, format);
+     int n = vsnprintf(buf, size, format, ap);
+     va_end(ap);
+#define MAX_SIZE 8196
+     if ((n > -1 && n < size) || size > MAX_SIZE) {
+       ldout(ch->cct, level) << buf << dendl;
+       return n;
+     }
+     size *= 2;
+   }
+}