Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/src/cls/version/cls_version.cc b/src/cls/version/cls_version.cc
new file mode 100644
index 00000000..61f9fec0
--- /dev/null
+++ b/src/cls/version/cls_version.cc
@@ -0,0 +1,234 @@
+// -*- 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/version/cls_version_ops.h"
+
+#include "include/compat.h"
+
+CLS_VER(1,0)
+CLS_NAME(version)
+
+
+#define VERSION_ATTR "ceph.objclass.version"
+
+static int set_version(cls_method_context_t hctx, struct obj_version *objv)
+{
+  bufferlist bl;
+
+  encode(*objv, bl);
+
+  CLS_LOG(20, "cls_version: set_version %s:%d", objv->tag.c_str(), (int)objv->ver);
+
+  int ret = cls_cxx_setxattr(hctx, VERSION_ATTR, &bl);
+  if (ret < 0)
+    return ret;
+
+  return 0;
+}
+
+static int init_version(cls_method_context_t hctx, struct obj_version *objv)
+{
+#define TAG_LEN 24
+  char buf[TAG_LEN + 1];
+
+  int ret = cls_gen_rand_base64(buf, sizeof(buf));
+  if (ret < 0)
+    return ret;
+
+  objv->ver = 1;
+  objv->tag = buf;
+
+  CLS_LOG(20, "cls_version: init_version %s:%d", objv->tag.c_str(), (int)objv->ver);
+
+  return set_version(hctx, objv);
+}
+
+/* implicit create should be true only if called from a write operation (set, inc), never from a read operation (read, check) */
+static int read_version(cls_method_context_t hctx, obj_version *objv, bool implicit_create)
+{
+  bufferlist bl;
+  int ret = cls_cxx_getxattr(hctx, VERSION_ATTR, &bl);
+  if (ret == -ENOENT || ret == -ENODATA) {
+    objv->ver = 0;
+
+    if (implicit_create) {
+      return init_version(hctx, objv);
+    }
+    return 0;
+  }
+  if (ret < 0)
+    return ret;
+
+  try {
+    auto iter = bl.cbegin();
+    decode(*objv, iter);
+  } catch (buffer::error& err) {
+    CLS_LOG(0, "ERROR: read_version(): failed to decode version entry\n");
+    return -EIO;
+  }
+  CLS_LOG(20, "cls_version: read_version %s:%d", objv->tag.c_str(), (int)objv->ver);
+
+  return 0;
+}
+
+static int cls_version_set(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
+{
+  auto in_iter = in->cbegin();
+
+  cls_version_set_op op;
+  try {
+    decode(op, in_iter);
+  } catch (buffer::error& err) {
+    CLS_LOG(1, "ERROR: cls_version_get(): failed to decode entry\n");
+    return -EINVAL;
+  }
+
+  int ret = set_version(hctx, &op.objv);
+  if (ret < 0)
+    return ret;
+
+  return 0;
+}
+
+static bool check_conds(list<obj_version_cond>& conds, obj_version& objv)
+{
+  if (conds.empty())
+    return true;
+
+  for (list<obj_version_cond>::iterator iter = conds.begin(); iter != conds.end(); ++iter) {
+    obj_version_cond& cond = *iter;
+    obj_version& v = cond.ver;
+    CLS_LOG(20, "cls_version: check_version %s:%d (cond=%d)", v.tag.c_str(), (int)v.ver, (int)cond.cond);
+
+    switch (cond.cond) {
+      case VER_COND_NONE:
+	break;
+      case VER_COND_EQ:
+	if (!objv.compare(&v))
+	  return false;
+	break;
+      case VER_COND_GT:
+	if (!(objv.ver > v.ver))
+	  return false;
+	break;
+      case VER_COND_GE:
+	if (!(objv.ver >= v.ver))
+	  return false;
+	break;
+      case VER_COND_LT:
+	if (!(objv.ver < v.ver))
+	  return false;
+	break;
+      case VER_COND_LE:
+	if (!(objv.ver <= v.ver))
+	  return false;
+	break;
+      case VER_COND_TAG_EQ:
+	if (objv.tag.compare(v.tag) != 0)
+	  return false;
+	break;
+      case VER_COND_TAG_NE:
+	if (objv.tag.compare(v.tag) == 0)
+	  return false;
+	break;
+    }
+  }
+
+  return true;
+}
+
+static int cls_version_inc(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
+{
+  auto in_iter = in->cbegin();
+
+  cls_version_inc_op op;
+  try {
+    decode(op, in_iter);
+  } catch (buffer::error& err) {
+    CLS_LOG(1, "ERROR: cls_version_get(): failed to decode entry\n");
+    return -EINVAL;
+  }
+
+  obj_version objv;
+  int ret = read_version(hctx, &objv, true);
+  if (ret < 0)
+    return ret;
+  
+  if (!check_conds(op.conds, objv)) {
+    return -ECANCELED;
+  }
+  objv.inc();
+
+  ret = set_version(hctx, &objv);
+  if (ret < 0)
+    return ret;
+
+  return 0;
+}
+
+static int cls_version_check(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
+{
+  auto in_iter = in->cbegin();
+
+  cls_version_check_op op;
+  try {
+    decode(op, in_iter);
+  } catch (buffer::error& err) {
+    CLS_LOG(1, "ERROR: cls_version_get(): failed to decode entry\n");
+    return -EINVAL;
+  }
+
+  obj_version objv;
+  int ret = read_version(hctx, &objv, false);
+  if (ret < 0)
+    return ret;
+  
+  if (!check_conds(op.conds, objv)) {
+    CLS_LOG(20, "cls_version: failed condition check");
+    return -ECANCELED;
+  }
+
+  return 0;
+}
+
+static int cls_version_read(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
+{
+  obj_version objv;
+
+  cls_version_read_ret read_ret;
+  int ret = read_version(hctx, &read_ret.objv, false);
+  if (ret < 0)
+    return ret;
+
+  encode(read_ret, *out);
+
+  return 0;
+}
+
+CLS_INIT(version)
+{
+  CLS_LOG(1, "Loaded version class!");
+
+  cls_handle_t h_class;
+  cls_method_handle_t h_version_set;
+  cls_method_handle_t h_version_inc;
+  cls_method_handle_t h_version_inc_conds;
+  cls_method_handle_t h_version_read;
+  cls_method_handle_t h_version_check_conds;
+
+  cls_register("version", &h_class);
+
+  /* version */
+  cls_register_cxx_method(h_class, "set", CLS_METHOD_RD | CLS_METHOD_WR, cls_version_set, &h_version_set);
+  cls_register_cxx_method(h_class, "inc", CLS_METHOD_RD | CLS_METHOD_WR, cls_version_inc, &h_version_inc);
+  cls_register_cxx_method(h_class, "inc_conds", CLS_METHOD_RD | CLS_METHOD_WR, cls_version_inc, &h_version_inc_conds);
+  cls_register_cxx_method(h_class, "read", CLS_METHOD_RD, cls_version_read, &h_version_read);
+  cls_register_cxx_method(h_class, "check_conds", CLS_METHOD_RD, cls_version_check, &h_version_check_conds);
+
+  return;
+}
+