Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

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

2 files changed, 247 insertions, 0 deletions

diff --git a/examples/librbd/Makefile b/examples/librbd/Makefile
new file mode 100644
index 000000000..2cd9f269a
--- /dev/null
+++ b/examples/librbd/Makefile
@@ -0,0 +1,27 @@
+
+CXX?=g++
+CXX_FLAGS?=-std=c++11 -Wno-unused-parameter -Wall -Wextra -Werror -g
+CXX_LIBS?=-lboost_system -lrbd -lrados
+CXX_INC?=$(LOCAL_LIBRADOS_INC)
+CXX_CC=$(CXX) $(CXX_FLAGS) $(CXX_INC) $(LOCAL_LIBRADOS)
+
+# Relative path to the Ceph source:
+CEPH_SRC_HOME?=../../src
+CEPH_BLD_HOME?=../../build
+
+LOCAL_LIBRADOS?=-L$(CEPH_BLD_HOME)/lib/ -Wl,-rpath,$(CEPH_BLD_HOME)/lib
+LOCAL_LIBRADOS_INC?=-I$(CEPH_SRC_HOME)/include
+
+all: hello_world_cpp 
+
+# Build against the system librados instead of the one in the build tree:
+all-system: LOCAL_LIBRADOS=
+all-system: LOCAL_LIBRADOS_INC=
+all-system: all
+
+hello_world_cpp: hello_world.cc
+	$(CXX_CC) -o hello_world_cpp hello_world.cc $(CXX_LIBS)
+
+clean:
+	rm -f hello_world_cpp
+
diff --git a/examples/librbd/hello_world.cc b/examples/librbd/hello_world.cc
new file mode 100644
index 000000000..f21c45f20
--- /dev/null
+++ b/examples/librbd/hello_world.cc
@@ -0,0 +1,220 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ */
+
+// install the librados-dev and librbd package to get this
+#include <rados/librados.hpp>
+#include <rbd/librbd.hpp>
+#include <iostream>
+#include <string>
+#include <sstream>
+
+int main(int argc, const char **argv)
+{
+  int ret = 0;
+
+  // we will use all of these below
+  const char *pool_name = "hello_world_pool";
+  std::string hello("hello world!");
+  std::string object_name("hello_object");
+  librados::IoCtx io_ctx;
+
+  // first, we create a Rados object and initialize it
+  librados::Rados rados;
+  {
+    ret = rados.init("admin"); // just use the client.admin keyring
+    if (ret < 0) { // let's handle any error that might have come back
+      std::cerr << "couldn't initialize rados! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just set up a rados cluster object" << std::endl;
+    }
+  }
+
+  /*
+   * Now we need to get the rados object its config info. It can
+   * parse argv for us to find the id, monitors, etc, so let's just
+   * use that.
+   */
+  {
+    ret = rados.conf_parse_argv(argc, argv);
+    if (ret < 0) {
+      // This really can't happen, but we need to check to be a good citizen.
+      std::cerr << "failed to parse config options! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just parsed our config options" << std::endl;
+      // We also want to apply the config file if the user specified
+      // one, and conf_parse_argv won't do that for us.
+      for (int i = 0; i < argc; ++i) {
+	if ((strcmp(argv[i], "-c") == 0) || (strcmp(argv[i], "--conf") == 0)) {
+	  ret = rados.conf_read_file(argv[i+1]);
+	  if (ret < 0) {
+	    // This could fail if the config file is malformed, but it'd be hard.
+	    std::cerr << "failed to parse config file " << argv[i+1]
+	              << "! error" << ret << std::endl;
+	    ret = EXIT_FAILURE;
+	    goto out;
+	  }
+	  break;
+	}
+      }
+    }
+  }
+
+  /*
+   * next, we actually connect to the cluster
+   */
+  {
+    ret = rados.connect();
+    if (ret < 0) {
+      std::cerr << "couldn't connect to cluster! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just connected to the rados cluster" << std::endl;
+    }
+  }
+
+  /*
+   * let's create our own pool instead of scribbling over real data.
+   * Note that this command creates pools with default PG counts specified
+   * by the monitors, which may not be appropriate for real use -- it's fine
+   * for testing, though.
+   */
+  {
+    ret = rados.pool_create(pool_name);
+    if (ret < 0) {
+      std::cerr << "couldn't create pool! error " << ret << std::endl;
+      return EXIT_FAILURE;
+    } else {
+      std::cout << "we just created a new pool named " << pool_name << std::endl;
+    }
+  }
+
+  /*
+   * create an "IoCtx" which is used to do IO to a pool
+   */
+  {
+    ret = rados.ioctx_create(pool_name, io_ctx);
+    if (ret < 0) {
+      std::cerr << "couldn't set up ioctx! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just created an ioctx for our pool" << std::endl;
+    }
+  }
+
+  /*
+   * create an rbd image and write data to it
+   */
+  {
+    std::string name = "librbd_test";
+    uint64_t size = 2 << 20;
+    int order = 0;
+    librbd::RBD rbd;
+    librbd::Image image;
+
+    ret = rbd.create(io_ctx, name.c_str(), size, &order);
+    if (ret < 0) {
+      std::cerr << "couldn't create an rbd image! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just created an rbd image" << std::endl;
+    }
+
+    ret = rbd.open(io_ctx, image, name.c_str(), NULL);
+    if (ret < 0) {
+      std::cerr << "couldn't open the rbd image! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just opened the rbd image" << std::endl;
+    }
+
+    int TEST_IO_SIZE = 512;
+    char test_data[TEST_IO_SIZE + 1];
+    int i;
+
+    for (i = 0; i < TEST_IO_SIZE; ++i) {
+      test_data[i] = (char) (rand() % (126 - 33) + 33);
+    }
+    test_data[TEST_IO_SIZE] = '\0';
+
+    size_t len = strlen(test_data);
+    ceph::bufferlist bl;
+    bl.append(test_data, len);
+
+    ret = image.write(0, len, bl);
+    if (ret < 0) {
+      std::cerr << "couldn't write to the rbd image! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just wrote data to our rbd image " << std::endl;
+    }
+
+    /*
+     * let's read the image and compare it to the data we wrote
+     */
+    ceph::bufferlist bl_r;
+    int read;
+    read = image.read(0, TEST_IO_SIZE, bl_r);
+    if (read < 0) {
+      std::cerr << "we couldn't read data from the image! error" << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    }
+  
+    std::string bl_res(bl_r.c_str(), read);
+  
+    int res = memcmp(bl_res.c_str(), test_data, TEST_IO_SIZE);
+    if (res != 0) {
+      std::cerr << "what we read didn't match expected! error" << std::endl;
+    } else {
+      std::cout << "we read our data on the image successfully" << std::endl;
+    }
+
+    image.close();
+
+    /*
+     *let's now delete the image
+     */
+    ret = rbd.remove(io_ctx, name.c_str());
+    if (ret < 0) {
+      std::cerr << "failed to delete rbd image! error " << ret << std::endl;
+      ret = EXIT_FAILURE;
+      goto out;
+    } else {
+      std::cout << "we just deleted our rbd image " << std::endl;
+    }
+  }
+
+  ret = EXIT_SUCCESS;
+  out:
+  /*
+   * And now we're done, so let's remove our pool and then
+   * shut down the connection gracefully.
+   */
+  int delete_ret = rados.pool_delete(pool_name);
+  if (delete_ret < 0) {
+    // be careful not to
+    std::cerr << "We failed to delete our test pool!" << std::endl;
+    ret = EXIT_FAILURE;
+  }
+
+  rados.shutdown();
+
+  return ret;
+}