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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <errno.h>
#include "objclass/objclass.h"
#include "cls/refcount/cls_refcount_ops.h"
#include "include/compat.h"
using std::string;
using ceph::bufferlist;
CLS_VER(1,0)
CLS_NAME(refcount)
#define REFCOUNT_ATTR "refcount"
static string wildcard_tag;
static int read_refcount(cls_method_context_t hctx, bool implicit_ref, obj_refcount *objr)
{
bufferlist bl;
objr->refs.clear();
int ret = cls_cxx_getxattr(hctx, REFCOUNT_ATTR, &bl);
if (ret == -ENODATA) {
if (implicit_ref) {
objr->refs[wildcard_tag] = true;
}
return 0;
}
if (ret < 0)
return ret;
try {
auto iter = bl.cbegin();
decode(*objr, iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(0, "ERROR: read_refcount(): failed to decode refcount entry\n");
return -EIO;
}
return 0;
}
static int set_refcount(cls_method_context_t hctx, const struct obj_refcount& objr)
{
bufferlist bl;
encode(objr, bl);
int ret = cls_cxx_setxattr(hctx, REFCOUNT_ATTR, &bl);
if (ret < 0)
return ret;
return 0;
}
static int cls_rc_refcount_get(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_refcount_get_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_rc_refcount_get(): failed to decode entry\n");
return -EINVAL;
}
obj_refcount objr;
int ret = read_refcount(hctx, op.implicit_ref, &objr);
if (ret < 0)
return ret;
CLS_LOG(10, "cls_rc_refcount_get() tag=%s\n", op.tag.c_str());
objr.refs[op.tag] = true;
ret = set_refcount(hctx, objr);
if (ret < 0)
return ret;
return 0;
}
static int cls_rc_refcount_put(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_refcount_put_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_rc_refcount_put(): failed to decode entry\n");
return -EINVAL;
}
obj_refcount objr;
int ret = read_refcount(hctx, op.implicit_ref, &objr);
if (ret < 0)
return ret;
if (objr.refs.empty()) {// shouldn't happen!
CLS_LOG(0, "ERROR: cls_rc_refcount_put() was called without any references!\n");
return -EINVAL;
}
CLS_LOG(10, "cls_rc_refcount_put() tag=%s\n", op.tag.c_str());
bool found = false;
auto iter = objr.refs.find(op.tag);
if (iter != objr.refs.end()) {
found = true;
} else if (op.implicit_ref) {
iter = objr.refs.find(wildcard_tag);
if (iter != objr.refs.end()) {
found = true;
}
}
if (!found ||
objr.retired_refs.find(op.tag) != objr.retired_refs.end())
return 0;
objr.retired_refs.insert(op.tag);
objr.refs.erase(iter);
if (objr.refs.empty()) {
return cls_cxx_remove(hctx);
}
ret = set_refcount(hctx, objr);
if (ret < 0)
return ret;
return 0;
}
static int cls_rc_refcount_set(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_refcount_set_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_refcount_set(): failed to decode entry\n");
return -EINVAL;
}
if (!op.refs.size()) {
return cls_cxx_remove(hctx);
}
obj_refcount objr;
for (auto iter = op.refs.begin(); iter != op.refs.end(); ++iter) {
objr.refs[*iter] = true;
}
int ret = set_refcount(hctx, objr);
if (ret < 0)
return ret;
return 0;
}
static int cls_rc_refcount_read(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_refcount_read_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_rc_refcount_read(): failed to decode entry\n");
return -EINVAL;
}
obj_refcount objr;
cls_refcount_read_ret read_ret;
int ret = read_refcount(hctx, op.implicit_ref, &objr);
if (ret < 0)
return ret;
for (auto iter = objr.refs.begin(); iter != objr.refs.end(); ++iter) {
read_ret.refs.push_back(iter->first);
}
encode(read_ret, *out);
return 0;
}
CLS_INIT(refcount)
{
CLS_LOG(1, "Loaded refcount class!");
cls_handle_t h_class;
cls_method_handle_t h_refcount_get;
cls_method_handle_t h_refcount_put;
cls_method_handle_t h_refcount_set;
cls_method_handle_t h_refcount_read;
cls_register("refcount", &h_class);
/* refcount */
cls_register_cxx_method(h_class, "get", CLS_METHOD_RD | CLS_METHOD_WR, cls_rc_refcount_get, &h_refcount_get);
cls_register_cxx_method(h_class, "put", CLS_METHOD_RD | CLS_METHOD_WR, cls_rc_refcount_put, &h_refcount_put);
cls_register_cxx_method(h_class, "set", CLS_METHOD_RD | CLS_METHOD_WR, cls_rc_refcount_set, &h_refcount_set);
cls_register_cxx_method(h_class, "read", CLS_METHOD_RD, cls_rc_refcount_read, &h_refcount_read);
return;
}
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