Exemplo n.º 1
0
int main(int argc, const char **argv) 
{
  rados_t cluster;
  rados_ioctx_t io_ctx;
  rbd_image_t image;

  srand(time(0));

  assert(rados_create(&cluster, NULL) == 0);
  assert(rados_conf_parse_argv(cluster, argc, argv) == 0);
  assert(rados_conf_read_file(cluster, NULL) == 0);
  assert(rados_connect(cluster) == 0);

  if (rados_pool_lookup(cluster, TEST_POOL) != -ENOENT) {
    int r = rados_pool_delete(cluster, TEST_POOL);
    printf("rados_pool_delete returned %d\n", r);
  }
  int r = rados_pool_create(cluster, TEST_POOL);
  printf("rados_pool_create returned %d\n", r);

  assert(rados_ioctx_create(cluster, TEST_POOL, &io_ctx) == 0);
  test_ls(io_ctx, 0);

  test_create_and_stat(io_ctx, TEST_IMAGE, MB_BYTES(1));
  assert(rbd_open(io_ctx, TEST_IMAGE, &image, NULL) == 0);

  test_ls(io_ctx, 1, TEST_IMAGE);
  test_ls_snaps(image, 0);

  test_create_snap(image, TEST_SNAP);
  test_ls_snaps(image, 1, TEST_SNAP, MB_BYTES(1));
  test_resize_and_stat(image, MB_BYTES(2));
  test_io(io_ctx, image);

  test_create_snap(image, TEST_SNAP "1");
  test_ls_snaps(image, 2, TEST_SNAP, MB_BYTES(1), TEST_SNAP "1", MB_BYTES(2));

  test_delete_snap(image, TEST_SNAP);
  test_ls_snaps(image, 1, TEST_SNAP "1", MB_BYTES(2));

  test_delete_snap(image, TEST_SNAP "1");
  test_ls_snaps(image, 0);

  test_io_to_snapshot(io_ctx, image, MB_BYTES(2));
  assert(rbd_close(image) == 0);

  test_create_and_stat(io_ctx, TEST_IMAGE "1", MB_BYTES(2));
  test_ls(io_ctx, 2, TEST_IMAGE, TEST_IMAGE "1");

  test_delete(io_ctx, TEST_IMAGE);
  test_ls(io_ctx, 1, TEST_IMAGE "1");

  test_delete(io_ctx, TEST_IMAGE "1");
  test_ls(io_ctx, 0);

  rados_ioctx_destroy(io_ctx);
  rados_shutdown(cluster);

  return 0;
}
Exemplo n.º 2
0
Arquivo: fsx.c Projeto: CzBiX/ceph
int
create_image()
{
	int r;
	int order = 0;

	r = rados_create(&cluster, NULL);
	if (r < 0) {
		simple_err("Could not create cluster handle", r);
		return r;
	}
	rados_conf_parse_env(cluster, NULL);
	r = rados_conf_read_file(cluster, NULL);
	if (r < 0) {
		simple_err("Error reading ceph config file", r);
		goto failed_shutdown;
	}
	r = rados_connect(cluster);
	if (r < 0) {
		simple_err("Error connecting to cluster", r);
		goto failed_shutdown;
	}
	r = krbd_create_from_context(rados_cct(cluster), &krbd);
	if (r < 0) {
		simple_err("Could not create libkrbd handle", r);
		goto failed_shutdown;
	}

	r = rados_pool_create(cluster, pool);
	if (r < 0 && r != -EEXIST) {
		simple_err("Error creating pool", r);
		goto failed_krbd;
	}
	r = rados_ioctx_create(cluster, pool, &ioctx);
	if (r < 0) {
		simple_err("Error creating ioctx", r);
		goto failed_krbd;
	}
	if (clone_calls) {
		r = rbd_create2(ioctx, iname, 0, RBD_FEATURE_LAYERING, &order);
	} else {
		r = rbd_create(ioctx, iname, 0, &order);
	}
	if (r < 0) {
		simple_err("Error creating image", r);
		goto failed_open;
	}

	return 0;

 failed_open:
	rados_ioctx_destroy(ioctx);
 failed_krbd:
	krbd_destroy(krbd);
 failed_shutdown:
	rados_shutdown(cluster);
	return r;
}
Exemplo n.º 3
0
static VALUE rb_rados_cluster_pool_create(VALUE self, VALUE pool_name) {
	GET_CLUSTER(self);
	int err;
	Check_Type(pool_name, T_STRING);
	char *cpool_name = StringValuePtr(pool_name);
	err = rados_pool_create(*wrapper->cluster, cpool_name);
	if (err < 0) {
		rb_raise(rb_const_get(mRados, rb_intern("PoolError")), "error creating pool '%s': %s", cpool_name, strerror(-err));
	}
	return Qtrue;
}
Exemplo n.º 4
0
int
create_image()
{
	int r;
	rados_t cluster;
	int order = 0;
	r = rados_create(&cluster, NULL);
	if (r < 0) {
		simple_err("Could not create cluster handle", r);
		return r;
	}
	rados_conf_parse_env(cluster, NULL);
	r = rados_conf_read_file(cluster, NULL);
	if (r < 0) {
		simple_err("Error reading ceph config file", r);
		goto failed_shutdown;
	}
	r = rados_connect(cluster);
	if (r < 0) {
		simple_err("Error connecting to cluster", r);
		goto failed_shutdown;
	}
	r = rados_pool_create(cluster, pool);
	if (r < 0 && r != -EEXIST) {
		simple_err("Error creating pool", r);
		goto failed_shutdown;
	}
	r = rados_ioctx_create(cluster, pool, &ioctx);
	if (r < 0) {
		simple_err("Error creating ioctx", r);
		goto failed_shutdown;
	}
	r = rbd_create(ioctx, iname, 0, &order);
	if (r < 0) {
		simple_err("Error creating image", r);
		goto failed_open;
	}

	return 0;

 failed_open:
	rados_ioctx_destroy(ioctx);
 failed_shutdown:
	rados_shutdown(cluster);
	return r;
}
Exemplo n.º 5
0
ERL_NIF_TERM x_pool_create(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    uint64_t id;
    char pool_name[MAX_NAME_LEN];
    if (!enif_get_uint64(env, argv[0], &id) ||
        !enif_get_string(env, argv[1], pool_name, MAX_NAME_LEN, ERL_NIF_LATIN1))
    {
        return enif_make_badarg(env);
    }

    rados_t cluster = map_cluster_get(id);
    if (cluster == NULL)
    {
        return enif_make_badarg(env);
    }

    int err = rados_pool_create(cluster, pool_name);
    if (err < 0) 
    {
        return make_error_tuple(env, -err);
    }
    return enif_make_atom(env, "ok");
}
Exemplo n.º 6
0
static int testrados(void)
{
	char tmp[32];
	int i, r;
	rados_t cl;

	if (rados_create(&cl, NULL) < 0) {
		printf("error initializing\n");
		return 1;
	}

	if (rados_conf_read_file(cl, NULL)) {
		printf("error reading configuration file\n");
		return 1;
	}

	// Try to set a configuration option that doesn't exist.
	// This should fail.
	if (!rados_conf_set(cl, "config option that doesn't exist",
			"some random value")) {
		printf("error: succeeded in setting nonexistent config option\n");
		return 1;
	}

	if (rados_conf_get(cl, "log to stderr", tmp, sizeof(tmp))) {
		printf("error: failed to read log_to_stderr from config\n");
		return 1;
	}

	// Can we change it?
	if (rados_conf_set(cl, "log to stderr", "2")) {
		printf("error: error setting log_to_stderr\n");
		return 1;
	}
	if (rados_conf_get(cl, "log to stderr", tmp, sizeof(tmp))) {
		printf("error: failed to read log_to_stderr from config\n");
		return 1;
	}
	if (tmp[0] != '2') {
		printf("error: new setting for log_to_stderr failed to take effect.\n");
		return 1;
	}

	if (rados_connect(cl)) {
		printf("error connecting\n");
		return 1;
	}
	if (rados_connect(cl) == 0) {
		printf("second connect attempt didn't return an error\n");
		return 1;
	}

	/* create an io_ctx */
	r = rados_pool_create(cl, "foo");
	printf("rados_pool_create = %d\n", r);

	rados_ioctx_t io_ctx;
	r = rados_ioctx_create(cl, "foo", &io_ctx);
	printf("rados_ioctx_create = %d, io_ctx = %p\n", r, io_ctx);

	/* list all pools */
	{
		int buf_sz = rados_pool_list(cl, NULL, 0);
		printf("need buffer size of %d\n", buf_sz);
		char buf[buf_sz];
		int r = rados_pool_list(cl, buf, buf_sz);
		if (r != buf_sz) {
			printf("buffer size mismatch: got %d the first time, but %d "
			"the second.\n", buf_sz, r);
			return 1;
		}
		const char *b = buf;
		printf("begin pools.\n");
		while (1) {
		if (b[0] == '\0')
		break;
		printf(" pool: '%s'\n", b);
		b += strlen(b) + 1;
		};
		printf("end pools.\n");
	}


	/* stat */
	struct rados_pool_stat_t st;
	r = rados_ioctx_pool_stat(io_ctx, &st);
	printf("rados_ioctx_pool_stat = %d, %lld KB, %lld objects\n", r, (long long)st.num_kb, (long long)st.num_objects);

	/* snapshots */
	r = rados_ioctx_snap_create(io_ctx, "snap1");
	printf("rados_ioctx_snap_create snap1 = %d\n", r);
	rados_snap_t snaps[10];
	r = rados_ioctx_snap_list(io_ctx, snaps, 10);
	for (i=0; i<r; i++) {
		char name[100];
		rados_ioctx_snap_get_name(io_ctx, snaps[i], name, sizeof(name));
		printf("rados_ioctx_snap_list got snap %lld %s\n", (long long)snaps[i], name);
	}
	rados_snap_t snapid;
	r = rados_ioctx_snap_lookup(io_ctx, "snap1", &snapid);
	printf("rados_ioctx_snap_lookup snap1 got %lld, result %d\n", (long long)snapid, r);
	r = rados_ioctx_snap_remove(io_ctx, "snap1");
	printf("rados_ioctx_snap_remove snap1 = %d\n", r);

	/* sync io */
	time_t tm;
	char buf[128], buf2[128];
	time(&tm);
	snprintf(buf, 128, "%s", ctime(&tm));
	const char *oid = "foo_object";
	r = rados_write(io_ctx, oid, buf, strlen(buf) + 1, 0);
	printf("rados_write = %d\n", r);
	r = rados_read(io_ctx, oid, buf2, sizeof(buf2), 0);
	printf("rados_read = %d\n", r);
	if (memcmp(buf, buf2, r))
		printf("*** content mismatch ***\n");

	/* attrs */
	if (do_rados_setxattr(io_ctx, oid, "b", "2"))
		return 1;
	if (do_rados_setxattr(io_ctx, oid, "a", "1"))
		return 1;
	if (do_rados_setxattr(io_ctx, oid, "c", "3"))
		return 1;
	if (do_rados_getxattr(io_ctx, oid, "a", "1"))
		return 1;
	if (do_rados_getxattr(io_ctx, oid, "b", "2"))
		return 1;
	if (do_rados_getxattr(io_ctx, oid, "c", "3"))
		return 1;
	const char *exkeys[] = { "a", "b", "c", NULL };
	const char *exvals[] = { "1", "2", "3", NULL };
	if (do_rados_getxattrs(io_ctx, oid, exkeys, exvals))
		return 1;

	uint64_t size;
	time_t mtime;
	r = rados_stat(io_ctx, oid, &size, &mtime);
	printf("rados_stat size = %lld mtime = %d = %d\n", (long long)size, (int)mtime, r);
	r = rados_stat(io_ctx, "does_not_exist", NULL, NULL);
	printf("rados_stat(does_not_exist) = %d\n", r);

	/* exec */
	rados_exec(io_ctx, oid, "crypto", "md5", buf, strlen(buf) + 1, buf, 128);
	printf("exec result=%s\n", buf);
	r = rados_read(io_ctx, oid, buf2, 128, 0);
	printf("read result=%s\n", buf2);
	printf("size=%d\n", r);

	/* aio */
	rados_completion_t a, b;
	rados_aio_create_completion(0, 0, 0, &a);
	rados_aio_create_completion(0, 0, 0, &b);
	rados_aio_write(io_ctx, "a", a, buf, 100, 0);
	rados_aio_write(io_ctx, "../b/bb_bb_bb\\foo\\bar", b, buf, 100, 0);
	rados_aio_wait_for_safe(a);
	printf("a safe\n");
	rados_aio_wait_for_safe(b);
	printf("b safe\n");
	rados_aio_release(a);
	rados_aio_release(b);

	/* test flush */
	printf("testing aio flush\n");
	rados_completion_t c;
	rados_aio_create_completion(0, 0, 0, &c);
	rados_aio_write(io_ctx, "c", c, buf, 100, 0);
	int safe = rados_aio_is_safe(c);
	printf("a should not yet be safe and ... %s\n", safe ? "is":"is not");
	assert(!safe);
	rados_aio_flush(io_ctx);
	safe = rados_aio_is_safe(c);
	printf("a should be safe and ... %s\n", safe ? "is":"is not");
	assert(safe);
	rados_aio_release(c);
	
	rados_read(io_ctx, "../b/bb_bb_bb\\foo\\bar", buf2, 128, 0);

	/* list objects */
	rados_list_ctx_t h;
	r = rados_objects_list_open(io_ctx, &h);
	printf("rados_list_objects_open = %d, h = %p\n", r, h);
	const char *poolname;
	while (rados_objects_list_next(h, &poolname) == 0)
		printf("rados_list_objects_next got object '%s'\n", poolname);
	rados_objects_list_close(h);

	/* stat */
	r = rados_ioctx_pool_stat(io_ctx, &st);
	printf("rados_stat_pool = %d, %lld KB, %lld objects\n", r, (long long)st.num_kb, (long long)st.num_objects);

	/* delete a pool */
	printf("rados_delete_pool = %d\n", r);
	rados_ioctx_destroy(io_ctx);

	r = rados_pool_delete(cl, "foo");
	printf("rados_ioctx_pool_delete = %d\n", r);

	rados_shutdown(cl);
	return 0;
}
Exemplo n.º 7
0
Arquivo: rados.c Projeto: Nikolo/uwsgi
static int uwsgi_rados_request(struct wsgi_request *wsgi_req) {
	char filename[PATH_MAX+1];
	if (!wsgi_req->len) {
		uwsgi_log( "Empty request. skip.\n");
		return -1;
	}

	if (uwsgi_parse_vars(wsgi_req)) {
		return -1;
	}

	// blocks empty paths
	if (wsgi_req->path_info_len == 0 || wsgi_req->path_info_len > PATH_MAX) {
		uwsgi_403(wsgi_req);
		return UWSGI_OK;
	}

	wsgi_req->app_id = uwsgi_get_app_id(wsgi_req, wsgi_req->appid, wsgi_req->appid_len, rados_plugin.modifier1);
	if (wsgi_req->app_id == -1 && !uwsgi.no_default_app && uwsgi.default_app > -1) {
		if (uwsgi_apps[uwsgi.default_app].modifier1 == rados_plugin.modifier1) {
			wsgi_req->app_id = uwsgi.default_app;
		}
	}
	if (wsgi_req->app_id == -1) {
		uwsgi_404(wsgi_req);
		return UWSGI_OK;
	}

	struct uwsgi_app *ua = &uwsgi_apps[wsgi_req->app_id];

	if (wsgi_req->path_info_len > ua->mountpoint_len &&
		memcmp(wsgi_req->path_info, ua->mountpoint, ua->mountpoint_len) == 0) {

		memcpy(filename, wsgi_req->path_info+ua->mountpoint_len, wsgi_req->path_info_len-ua->mountpoint_len);
		filename[wsgi_req->path_info_len-ua->mountpoint_len] = 0;

	} else {
		memcpy(filename, wsgi_req->path_info, wsgi_req->path_info_len);
		filename[wsgi_req->path_info_len] = 0;
	}
	
	// in multithread mode the memory is different (as we need a ctx for each thread) !!!
	rados_ioctx_t ctx;
	if (uwsgi.threads > 1) {
		rados_ioctx_t *ctxes = (rados_ioctx_t *) ua->responder0;
		ctx = ctxes[wsgi_req->async_id];
	}
	else {
		ctx = (rados_ioctx_t) ua->responder0;
	}
	struct uwsgi_rados_mountpoint *urmp = (struct uwsgi_rados_mountpoint *) ua->responder1;
	uint64_t stat_size = 0;
	time_t stat_mtime = 0;

	struct uwsgi_rados_io *urio = &urados.urio[wsgi_req->async_id];

	if (uwsgi.async > 0) {
	// no need to lock here (the rid protect us)
        	if (pipe(urio->fds)) {
                	uwsgi_error("uwsgi_rados_read_async()/pipe()");
			uwsgi_500(wsgi_req);
			return UWSGI_OK;
        	}
	}
	
	int ret = -1;
	int timeout = urmp->timeout ? urmp->timeout : urados.timeout;

	if (!uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "OPTIONS", 7)) {
		if (uwsgi_response_prepare_headers(wsgi_req, "200 OK", 6)) goto end;
		if (uwsgi_response_add_header(wsgi_req, "Dav", 3, "1", 1)) goto end;	
		struct uwsgi_buffer *ub_allow = uwsgi_buffer_new(64);
		if (uwsgi_buffer_append(ub_allow, "OPTIONS, GET, HEAD", 18)) {
			uwsgi_buffer_destroy(ub_allow);
			goto end;
		}
		if (urmp->allow_put) {
			if (uwsgi_buffer_append(ub_allow, ", PUT", 5)) {
				uwsgi_buffer_destroy(ub_allow);
				goto end;
			}
		}
		if (urmp->allow_delete) {
			if (uwsgi_buffer_append(ub_allow, ", DELETE", 8)) {
				uwsgi_buffer_destroy(ub_allow);
				goto end;
			}
		}
		if (urmp->allow_mkcol) {
			if (uwsgi_buffer_append(ub_allow, ", MKCOL", 7)) {
				uwsgi_buffer_destroy(ub_allow);
				goto end;
			}
		}
		if (urmp->allow_propfind) {
			if (uwsgi_buffer_append(ub_allow, ", PROPFIND", 10)) {
				uwsgi_buffer_destroy(ub_allow);
				goto end;
			}
		}

		uwsgi_response_add_header(wsgi_req, "Allow", 5, ub_allow->buf, ub_allow->pos);
		uwsgi_buffer_destroy(ub_allow);
                goto end;
	}

	// empty paths are mapped to propfind
	if (wsgi_req->path_info_len == 1 && wsgi_req->path_info[0] == '/') {
		if (urmp->allow_propfind && !uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "PROPFIND", 8)) {
			uwsgi_rados_propfind(wsgi_req, ctx, NULL, 0, 0, timeout);
			goto end;
		}
                uwsgi_405(wsgi_req);
		goto end;
	}

	// MKCOL does not require stat
	if (!uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "MKCOL", 5)) {
                if (!urmp->allow_mkcol) {
                        uwsgi_405(wsgi_req);
                        goto end;
                }
                ret = rados_pool_create(urmp->cluster, filename);
		if (ret < 0) {
			if (ret == -EEXIST) {
                        	uwsgi_405(wsgi_req);
			}
			else {
                        	uwsgi_500(wsgi_req);
			}
                        goto end;
                }
                uwsgi_response_prepare_headers(wsgi_req, "201 Created", 11);
                goto end;
	}

	if (uwsgi.async > 0) {
		ret = uwsgi_rados_async_stat(urio, ctx, filename, &stat_size, &stat_mtime, timeout);	
	}
	else {
		ret = rados_stat(ctx, filename, &stat_size, &stat_mtime);
	}

	// PUT AND MKCOL can be used for non-existent objects
	if (!uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "PUT", 3)) {
		if (!urmp->allow_put) {
			uwsgi_405(wsgi_req);
			goto end;
		}
		if (ret == 0) {
			if (uwsgi_rados_delete(wsgi_req, ctx, filename, timeout)) {
				uwsgi_500(wsgi_req);
				goto end;
			}
		}	
		if (uwsgi_rados_put(wsgi_req, ctx, filename, urmp->put_buffer_size, timeout)) {
			uwsgi_500(wsgi_req);
			goto end;
		}
		uwsgi_response_prepare_headers(wsgi_req, "201 Created", 11);	
		goto end;
	}
	else if (ret < 0) {
		if (ret == -ENOENT)
			uwsgi_404(wsgi_req);
		else
			uwsgi_403(wsgi_req);
		goto end;
	}

	if (!uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "DELETE", 6)) {
		if (!urmp->allow_delete) {
			uwsgi_405(wsgi_req);
                        goto end;
		}
		if (uwsgi_rados_delete(wsgi_req, ctx, filename, timeout)) {
			uwsgi_403(wsgi_req);
                        goto end;
		}
		uwsgi_response_prepare_headers(wsgi_req, "200 OK", 6);
		goto end;
	}

	if (!uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "PROPFIND", 8)) {
		if (!urmp->allow_propfind) {
			uwsgi_405(wsgi_req);
                        goto end;
		}
		uwsgi_rados_propfind(wsgi_req, ctx, filename, stat_size, stat_mtime, timeout);
		goto end;
	}

	if (uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "HEAD", 4) && uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "GET", 3)) {
		uwsgi_405(wsgi_req);
		goto end;
	}

	uint64_t offset = 0;
	uint64_t remains = stat_size;
	uwsgi_request_fix_range_for_size(wsgi_req, remains);
	switch (wsgi_req->range_parsed) {
		case UWSGI_RANGE_INVALID:
			if (uwsgi_response_prepare_headers(wsgi_req,
						"416 Requested Range Not Satisfiable", 35))
				goto end;
			if (uwsgi_response_add_content_range(wsgi_req, -1, -1, stat_size))
				goto end;
			return 0;
		case UWSGI_RANGE_VALID:
			offset = wsgi_req->range_from;
			remains = wsgi_req->range_to - wsgi_req->range_from + 1;
			if (uwsgi_response_prepare_headers(wsgi_req, "206 Partial Content", 19))
				goto end;
			break;
		default: /* UWSGI_RANGE_NOT_PARSED */
			if (uwsgi_response_prepare_headers(wsgi_req, "200 OK", 6)) return -1;
	}

	size_t mime_type_len = 0;
	char *mime_type = uwsgi_get_mime_type(wsgi_req->path_info, wsgi_req->path_info_len, &mime_type_len);
	if (mime_type) {
		if (uwsgi_response_add_content_type(wsgi_req, mime_type, mime_type_len)) goto end;
	}

	if (uwsgi_response_add_last_modified(wsgi_req, (uint64_t) stat_mtime)) goto end;
        // set Content-Length to actual result size
	if (uwsgi_response_add_content_length(wsgi_req, remains)) goto end;
        if (wsgi_req->range_parsed == UWSGI_RANGE_VALID) {
                // here use the original size !!!
                if (uwsgi_response_add_content_range(wsgi_req, wsgi_req->range_from, wsgi_req->range_to, stat_size))
                        goto end;
        }

	// skip body on HEAD
	if (uwsgi_strncmp(wsgi_req->method, wsgi_req->method_len, "HEAD", 4)) {
		if (uwsgi.async > 0) {
			if (uwsgi_rados_read_async(wsgi_req, ctx, filename, offset, remains, urmp->buffer_size, timeout)) goto end;
		}
		else {
			if (uwsgi_rados_read_sync(wsgi_req, ctx, filename, offset, remains, urmp->buffer_size)) goto end;
		}
	}

end:
	if (uwsgi.async > 0) {
		close(urio->fds[0]);
		close(urio->fds[1]);
	}
	return UWSGI_OK;
}
Exemplo n.º 8
0
int main(int argc, const char **argv)
{
  int ret = 0;

  // we will use all of these below
  const char *pool_name = "hello_world_pool";
  const char* hello = "hello world!";
  const char* object_name = "hello_object";
  rados_ioctx_t io_ctx = NULL;
  int pool_created = 0;

  // first, we create a Rados object and initialize it
  rados_t rados = NULL;
  {
    ret = rados_create(&rados, "admin"); // just use the client.admin keyring
    if (ret < 0) { // let's handle any error that might have come back
      printf("couldn't initialize rados! error %d\n", ret);
      ret = EXIT_FAILURE;
      goto out;
    } else {
      printf("we just set up a rados cluster object\n");
    }
  }

  /*
   * 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(rados, argc, argv);
    if (ret < 0) {
      // This really can't happen, but we need to check to be a good citizen.
      printf("failed to parse config options! error %d\n", ret);
      ret = EXIT_FAILURE;
      goto out;
    } else {
      printf("we just parsed our config options\n");
      // We also want to apply the config file if the user specified
      // one, and conf_parse_argv won't do that for us.
      int i;
      for (i = 0; i < argc; ++i) {
  	if ((strcmp(argv[i], "-c") == 0) || (strcmp(argv[i], "--conf") == 0)) {
  	  ret = rados_conf_read_file(rados, argv[i+1]);
  	  if (ret < 0) {
  	    // This could fail if the config file is malformed, but it'd be hard.
	    printf("failed to parse config file %s! error %d\n", argv[i+1], ret);
  	    ret = EXIT_FAILURE;
  	    goto out;
  	  }
  	  break;
  	}
      }
    }
  }

  /*
   * next, we actually connect to the cluster
   */
  {
    ret = rados_connect(rados);
    if (ret < 0) {
      printf("couldn't connect to cluster! error %d\n", ret);
      ret = EXIT_FAILURE;
      goto out;
    } else {
      printf("we just connected to the rados cluster\n");
    }
  }

  /*
   * 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(rados, pool_name);
    if (ret < 0) {
      printf("couldn't create pool! error %d\n", ret);
      return EXIT_FAILURE;
    } else {
      printf("we just created a new pool named %s\n", pool_name);
    }
    pool_created = 1;
  }

  /*
   * create an "IoCtx" which is used to do IO to a pool
   */
  {
    ret = rados_ioctx_create(rados, pool_name, &io_ctx);
    if (ret < 0) {
      printf("couldn't set up ioctx! error %d\n", ret);
      ret = EXIT_FAILURE;
      goto out;
    } else {
      printf("we just created an ioctx for our pool\n");
    }
  }

  /*
   * now let's do some IO to the pool! We'll write "hello world!" to a
   * new object.
   */
  {
    /*
     * now that we have the data to write, let's send it to an object.
     * We'll use the synchronous interface for simplicity.
     */
    ret = rados_write_full(io_ctx, object_name, hello, strlen(hello));
    if (ret < 0) {
      printf("couldn't write object! error %d\n", ret);
      ret = EXIT_FAILURE;
      goto out;
    } else {
      printf("we just wrote new object %s, with contents '%s'\n", object_name, hello);
    }
  }

  /*
   * now let's read that object back! Just for fun, we'll do it using
   * async IO instead of synchronous. (This would be more useful if we
   * wanted to send off multiple reads at once; see
   * http://ceph.com/docs/master/rados/api/librados/#asychronous-io )
   */
  {
    int read_len = 4194304; // this is way more than we need
    char* read_buf = malloc(read_len + 1); // add one for the terminating 0 we'll add later
    if (!read_buf) {
      printf("couldn't allocate read buffer\n");
      ret = EXIT_FAILURE;
      goto out;
    }
    // allocate the completion from librados
    rados_completion_t read_completion;
    ret = rados_aio_create_completion(NULL, NULL, NULL, &read_completion);
    if (ret < 0) {
      printf("couldn't create completion! error %d\n", ret);
      ret = EXIT_FAILURE;
      free(read_buf);
      goto out;
    } else {
      printf("we just created a new completion\n");
    }
    // send off the request.
    ret = rados_aio_read(io_ctx, object_name, read_completion, read_buf, read_len, 0);
    if (ret < 0) {
      printf("couldn't start read object! error %d\n", ret);
      ret = EXIT_FAILURE;
      free(read_buf);
      rados_aio_release(read_completion);
      goto out;
    }
    // wait for the request to complete, and check that it succeeded.
    rados_aio_wait_for_complete(read_completion);
    ret = rados_aio_get_return_value(read_completion);
    if (ret < 0) {
      printf("couldn't read object! error %d\n", ret);
      ret = EXIT_FAILURE;
      free(read_buf);
      rados_aio_release(read_completion);
      goto out;
    } else {
      read_buf[ret] = 0; // null-terminate the string
      printf("we read our object %s, and got back %d bytes with contents\n%s\n", object_name, ret, read_buf);
    }

    free(read_buf);
    rados_aio_release(read_completion);
  }

  /*
   * We can also use xattrs that go alongside the object.
   */
  {
    const char* version = "1";
    ret = rados_setxattr(io_ctx, object_name, "version", version, strlen(version));
    if (ret < 0) {
      printf("failed to set xattr version entry! error %d\n", ret);
      ret = EXIT_FAILURE;
      goto out;
    } else {
      printf("we set the xattr 'version' on our object!\n");
    }
  }

  /*
   * And if we want to be really cool, we can do multiple things in a single
   * atomic operation. For instance, we can update the contents of our object
   * and set the version at the same time.
   */
  {
    const char* content = "v2";
    rados_write_op_t write_op = rados_create_write_op();
    if (!write_op) {
      printf("failed to allocate write op\n");
      ret = EXIT_FAILURE;
      goto out;
    }
    rados_write_op_write_full(write_op, content, strlen(content));
    const char* version = "2";
    rados_write_op_setxattr(write_op, "version", version, strlen(version));
    ret = rados_write_op_operate(write_op, io_ctx, object_name, NULL, 0);
    if (ret < 0) {
      printf("failed to do compound write! error %d\n", ret);
      ret = EXIT_FAILURE;
      rados_release_write_op(write_op);
      goto out;
    } else {
      printf("we overwrote our object %s with contents\n%s\n", object_name, content);
    }
    rados_release_write_op(write_op);
  }

  /*
   * And to be even cooler, we can make sure that the object looks the
   * way we expect before doing the write! Notice how this attempt fails
   * because the xattr differs.
   */
  {
    rados_write_op_t failed_write_op = rados_create_write_op();
    if (!failed_write_op) {
      printf("failed to allocate write op\n");
      ret = EXIT_FAILURE;
      goto out;
    }
    const char* content = "v2";
    const char* version = "2";
    const char* old_version = "1";
    rados_write_op_cmpxattr(failed_write_op, "version", LIBRADOS_CMPXATTR_OP_EQ, old_version, strlen(old_version));
    rados_write_op_write_full(failed_write_op, content, strlen(content));
    rados_write_op_setxattr(failed_write_op, "version", version, strlen(version));
    ret = rados_write_op_operate(failed_write_op, io_ctx, object_name, NULL, 0);
    if (ret < 0) {
      printf("we just failed a write because the xattr wasn't as specified\n");
    } else {
      printf("we succeeded on writing despite an xattr comparison mismatch!\n");
      ret = EXIT_FAILURE;
      rados_release_write_op(failed_write_op);
      goto out;
    }
    rados_release_write_op(failed_write_op);

    /*
     * Now let's do the update with the correct xattr values so it
     * actually goes through
     */
    content = "v3";
    old_version = "2";
    version = "3";
    rados_write_op_t update_op = rados_create_write_op();
    if (!failed_write_op) {
      printf("failed to allocate write op\n");
      ret = EXIT_FAILURE;
      goto out;
    }
    rados_write_op_cmpxattr(update_op, "version", LIBRADOS_CMPXATTR_OP_EQ, old_version, strlen(old_version));
    rados_write_op_write_full(update_op, content, strlen(content));
    rados_write_op_setxattr(update_op, "version", version, strlen(version));
    ret = rados_write_op_operate(update_op, io_ctx, object_name, NULL, 0);
    if (ret < 0) {
      printf("failed to do a compound write update! error %d\n", ret);
      ret = EXIT_FAILURE;
      rados_release_write_op(update_op);
      goto out;
    } else {
      printf("we overwrote our object %s following an xattr test with contents\n%s\n", object_name, content);
    }
    rados_release_write_op(update_op);
  }

  ret = EXIT_SUCCESS;

 out:
  if (io_ctx) {
    rados_ioctx_destroy(io_ctx);
  }

  if (pool_created) {
    /*
     * And now we're done, so let's remove our pool and then
     * shut down the connection gracefully.
     */
    int delete_ret = rados_pool_delete(rados, pool_name);
    if (delete_ret < 0) {
      // be careful not to
      printf("We failed to delete our test pool!\n");
      ret = EXIT_FAILURE;
    }
  }

  rados_shutdown(rados);

  return ret;
}