--- /dev/null
+// -*- 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"
+
+CLS_VER(1,0)
+CLS_NAME(refcount)
+
+
+#define REFCOUNT_ATTR "refcount"
+
+struct obj_refcount {
+ map<string, bool> refs;
+ set<string> retired_refs;
+
+ obj_refcount() {}
+
+ void encode(bufferlist& bl) const {
+ ENCODE_START(2, 1, bl);
+ ::encode(refs, bl);
+ ::encode(retired_refs, bl);
+ ENCODE_FINISH(bl);
+ }
+
+ void decode(bufferlist::iterator& bl) {
+ DECODE_START(2, bl);
+ ::decode(refs, bl);
+ if (struct_v >= 2) {
+ ::decode(retired_refs, bl);
+ }
+ DECODE_FINISH(bl);
+ }
+};
+WRITE_CLASS_ENCODER(obj_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 {
+ bufferlist::iterator iter = bl.begin();
+ ::decode(*objr, iter);
+ } catch (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)
+{
+ bufferlist::iterator in_iter = in->begin();
+
+ cls_refcount_get_op op;
+ try {
+ ::decode(op, in_iter);
+ } catch (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)
+{
+ bufferlist::iterator in_iter = in->begin();
+
+ cls_refcount_put_op op;
+ try {
+ ::decode(op, in_iter);
+ } catch (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;
+ map<string, bool>::iterator 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)
+{
+ bufferlist::iterator in_iter = in->begin();
+
+ cls_refcount_set_op op;
+ try {
+ ::decode(op, in_iter);
+ } catch (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;
+ list<string>::iterator iter;
+ for (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)
+{
+ bufferlist::iterator in_iter = in->begin();
+
+ cls_refcount_read_op op;
+ try {
+ ::decode(op, in_iter);
+ } catch (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;
+
+ map<string, bool>::iterator iter;
+ for (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;
+}
+
Code Review / stor4nfv.git / blobdiff