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-rw-r--r--src/tools/rbd_nbd/CMakeLists.txt4
-rw-r--r--src/tools/rbd_nbd/nbd-netlink.h100
-rw-r--r--src/tools/rbd_nbd/rbd-nbd.cc2304
-rwxr-xr-xsrc/tools/rbd_nbd/rbd-nbd_quiesce31
4 files changed, 2439 insertions, 0 deletions
diff --git a/src/tools/rbd_nbd/CMakeLists.txt b/src/tools/rbd_nbd/CMakeLists.txt
new file mode 100644
index 000000000..da758f514
--- /dev/null
+++ b/src/tools/rbd_nbd/CMakeLists.txt
@@ -0,0 +1,4 @@
+find_package(nl REQUIRED genl)
+add_executable(rbd-nbd rbd-nbd.cc)
+target_link_libraries(rbd-nbd librbd librados global nl::genl)
+install(TARGETS rbd-nbd DESTINATION bin)
diff --git a/src/tools/rbd_nbd/nbd-netlink.h b/src/tools/rbd_nbd/nbd-netlink.h
new file mode 100644
index 000000000..2d0b90964
--- /dev/null
+++ b/src/tools/rbd_nbd/nbd-netlink.h
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2017 Facebook. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+#ifndef _UAPILINUX_NBD_NETLINK_H
+#define _UAPILINUX_NBD_NETLINK_H
+
+#define NBD_GENL_FAMILY_NAME "nbd"
+#define NBD_GENL_VERSION 0x1
+#define NBD_GENL_MCAST_GROUP_NAME "nbd_mc_group"
+
+/* Configuration policy attributes, used for CONNECT */
+enum {
+ NBD_ATTR_UNSPEC,
+ NBD_ATTR_INDEX,
+ NBD_ATTR_SIZE_BYTES,
+ NBD_ATTR_BLOCK_SIZE_BYTES,
+ NBD_ATTR_TIMEOUT,
+ NBD_ATTR_SERVER_FLAGS,
+ NBD_ATTR_CLIENT_FLAGS,
+ NBD_ATTR_SOCKETS,
+ NBD_ATTR_DEAD_CONN_TIMEOUT,
+ NBD_ATTR_DEVICE_LIST,
+ NBD_ATTR_BACKEND_IDENTIFIER,
+ __NBD_ATTR_MAX,
+};
+#define NBD_ATTR_MAX (__NBD_ATTR_MAX - 1)
+
+/*
+ * This is the format for multiple devices with NBD_ATTR_DEVICE_LIST
+ *
+ * [NBD_ATTR_DEVICE_LIST]
+ * [NBD_DEVICE_ITEM]
+ * [NBD_DEVICE_INDEX]
+ * [NBD_DEVICE_CONNECTED]
+ */
+enum {
+ NBD_DEVICE_ITEM_UNSPEC,
+ NBD_DEVICE_ITEM,
+ __NBD_DEVICE_ITEM_MAX,
+};
+#define NBD_DEVICE_ITEM_MAX (__NBD_DEVICE_ITEM_MAX - 1)
+
+enum {
+ NBD_DEVICE_UNSPEC,
+ NBD_DEVICE_INDEX,
+ NBD_DEVICE_CONNECTED,
+ __NBD_DEVICE_MAX,
+};
+#define NBD_DEVICE_ATTR_MAX (__NBD_DEVICE_MAX - 1)
+
+/*
+ * This is the format for multiple sockets with NBD_ATTR_SOCKETS
+ *
+ * [NBD_ATTR_SOCKETS]
+ * [NBD_SOCK_ITEM]
+ * [NBD_SOCK_FD]
+ * [NBD_SOCK_ITEM]
+ * [NBD_SOCK_FD]
+ */
+enum {
+ NBD_SOCK_ITEM_UNSPEC,
+ NBD_SOCK_ITEM,
+ __NBD_SOCK_ITEM_MAX,
+};
+#define NBD_SOCK_ITEM_MAX (__NBD_SOCK_ITEM_MAX - 1)
+
+enum {
+ NBD_SOCK_UNSPEC,
+ NBD_SOCK_FD,
+ __NBD_SOCK_MAX,
+};
+#define NBD_SOCK_MAX (__NBD_SOCK_MAX - 1)
+
+enum {
+ NBD_CMD_UNSPEC,
+ NBD_CMD_CONNECT,
+ NBD_CMD_DISCONNECT,
+ NBD_CMD_RECONFIGURE,
+ NBD_CMD_LINK_DEAD,
+ NBD_CMD_STATUS,
+ __NBD_CMD_MAX,
+};
+#define NBD_CMD_MAX (__NBD_CMD_MAX - 1)
+
+#endif /* _UAPILINUX_NBD_NETLINK_H */
diff --git a/src/tools/rbd_nbd/rbd-nbd.cc b/src/tools/rbd_nbd/rbd-nbd.cc
new file mode 100644
index 000000000..eb9e858f4
--- /dev/null
+++ b/src/tools/rbd_nbd/rbd-nbd.cc
@@ -0,0 +1,2304 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+/*
+ * rbd-nbd - RBD in userspace
+ *
+ * Copyright (C) 2015 - 2016 Kylin Corporation
+ *
+ * Author: Yunchuan Wen <yunchuan.wen@kylin-cloud.com>
+ * Li Wang <li.wang@kylin-cloud.com>
+ *
+ * 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.
+ *
+*/
+
+#include "acconfig.h"
+#include "include/int_types.h"
+#include "include/scope_guard.h"
+
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <linux/nbd.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/syscall.h>
+
+#include "nbd-netlink.h"
+#include <libnl3/netlink/genl/genl.h>
+#include <libnl3/netlink/genl/ctrl.h>
+#include <libnl3/netlink/genl/mngt.h>
+
+#if __has_include(<filesystem>)
+#include <filesystem>
+namespace fs = std::filesystem;
+#else
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#endif
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <regex>
+#include <boost/algorithm/string/predicate.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include "common/Formatter.h"
+#include "common/Preforker.h"
+#include "common/SubProcess.h"
+#include "common/TextTable.h"
+#include "common/ceph_argparse.h"
+#include "common/config.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "common/event_socket.h"
+#include "common/module.h"
+#include "common/safe_io.h"
+#include "common/version.h"
+
+#include "global/global_init.h"
+#include "global/signal_handler.h"
+
+#include "include/rados/librados.hpp"
+#include "include/rbd/librbd.hpp"
+#include "include/stringify.h"
+#include "include/xlist.h"
+
+#include "mon/MonClient.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "rbd-nbd: "
+
+enum Command {
+ None,
+ Map,
+ Unmap,
+ Attach,
+ Detach,
+ List
+};
+
+struct Config {
+ int nbds_max = 0;
+ int max_part = 255;
+ int io_timeout = -1;
+ int reattach_timeout = 30;
+
+ bool exclusive = false;
+ bool quiesce = false;
+ bool readonly = false;
+ bool set_max_part = false;
+ bool try_netlink = false;
+ bool show_cookie = false;
+
+ std::string poolname;
+ std::string nsname;
+ std::string imgname;
+ std::string snapname;
+ std::string devpath;
+ std::string quiesce_hook = CMAKE_INSTALL_LIBEXECDIR "/rbd-nbd/rbd-nbd_quiesce";
+
+ std::string format;
+ bool pretty_format = false;
+
+ std::optional<librbd::encryption_format_t> encryption_format;
+ std::optional<std::string> encryption_passphrase_file;
+
+ Command command = None;
+ int pid = 0;
+ std::string cookie;
+
+ std::string image_spec() const {
+ std::string spec = poolname + "/";
+
+ if (!nsname.empty()) {
+ spec += "/" + nsname;
+ }
+ spec += imgname;
+
+ if (!snapname.empty()) {
+ spec += "@" + snapname;
+ }
+
+ return spec;
+ }
+};
+
+static void usage()
+{
+ std::cout << "Usage: rbd-nbd [options] map <image-or-snap-spec> Map image to nbd device\n"
+ << " detach <device|image-or-snap-spec> Detach image from nbd device\n"
+ << " [options] attach <image-or-snap-spec> Attach image to nbd device\n"
+ << " unmap <device|image-or-snap-spec> Unmap nbd device\n"
+ << " [options] list-mapped List mapped nbd devices\n"
+ << "Map and attach options:\n"
+ << " --device <device path> Specify nbd device path (/dev/nbd{num})\n"
+ << " --encryption-format Image encryption format\n"
+ << " (possible values: luks1, luks2)\n"
+ << " --encryption-passphrase-file Path of file containing passphrase for unlocking image encryption\n"
+ << " --exclusive Forbid writes by other clients\n"
+ << " --io-timeout <sec> Set nbd IO timeout\n"
+ << " --max_part <limit> Override for module param max_part\n"
+ << " --nbds_max <limit> Override for module param nbds_max\n"
+ << " --quiesce Use quiesce callbacks\n"
+ << " --quiesce-hook <path> Specify quiesce hook path\n"
+ << " (default: " << Config().quiesce_hook << ")\n"
+ << " --read-only Map read-only\n"
+ << " --reattach-timeout <sec> Set nbd re-attach timeout\n"
+ << " (default: " << Config().reattach_timeout << ")\n"
+ << " --try-netlink Use the nbd netlink interface\n"
+ << " --show-cookie Show device cookie\n"
+ << " --cookie Specify device cookie\n"
+ << "\n"
+ << "List options:\n"
+ << " --format plain|json|xml Output format (default: plain)\n"
+ << " --pretty-format Pretty formatting (json and xml)\n"
+ << std::endl;
+ generic_server_usage();
+}
+
+static int nbd = -1;
+static int nbd_index = -1;
+static EventSocket terminate_event_sock;
+
+#define RBD_NBD_BLKSIZE 512UL
+
+#define HELP_INFO 1
+#define VERSION_INFO 2
+
+#ifdef CEPH_BIG_ENDIAN
+#define ntohll(a) (a)
+#elif defined(CEPH_LITTLE_ENDIAN)
+#define ntohll(a) swab(a)
+#else
+#error "Could not determine endianess"
+#endif
+#define htonll(a) ntohll(a)
+
+static int parse_args(vector<const char*>& args, std::ostream *err_msg,
+ Config *cfg);
+static int netlink_disconnect(int index);
+static int netlink_resize(int nbd_index, uint64_t size);
+
+static int run_quiesce_hook(const std::string &quiesce_hook,
+ const std::string &devpath,
+ const std::string &command);
+
+static std::string get_cookie(const std::string &devpath);
+
+class NBDServer
+{
+public:
+ uint64_t quiesce_watch_handle = 0;
+
+private:
+ int fd;
+ librbd::Image &image;
+ Config *cfg;
+
+public:
+ NBDServer(int fd, librbd::Image& image, Config *cfg)
+ : fd(fd)
+ , image(image)
+ , cfg(cfg)
+ , reader_thread(*this, &NBDServer::reader_entry)
+ , writer_thread(*this, &NBDServer::writer_entry)
+ , quiesce_thread(*this, &NBDServer::quiesce_entry)
+ {
+ std::vector<librbd::config_option_t> options;
+ image.config_list(&options);
+ for (auto &option : options) {
+ if ((option.name == std::string("rbd_cache") ||
+ option.name == std::string("rbd_cache_writethrough_until_flush")) &&
+ option.value == "false") {
+ allow_internal_flush = true;
+ break;
+ }
+ }
+ }
+
+ Config *get_cfg() const {
+ return cfg;
+ }
+
+private:
+ int terminate_event_fd = -1;
+ ceph::mutex disconnect_lock =
+ ceph::make_mutex("NBDServer::DisconnectLocker");
+ ceph::condition_variable disconnect_cond;
+ std::atomic<bool> terminated = { false };
+ std::atomic<bool> allow_internal_flush = { false };
+
+ struct IOContext
+ {
+ xlist<IOContext*>::item item;
+ NBDServer *server = nullptr;
+ struct nbd_request request;
+ struct nbd_reply reply;
+ bufferlist data;
+ int command = 0;
+
+ IOContext()
+ : item(this)
+ {}
+ };
+
+ friend std::ostream &operator<<(std::ostream &os, const IOContext &ctx);
+
+ ceph::mutex lock = ceph::make_mutex("NBDServer::Locker");
+ ceph::condition_variable cond;
+ xlist<IOContext*> io_pending;
+ xlist<IOContext*> io_finished;
+
+ void io_start(IOContext *ctx)
+ {
+ std::lock_guard l{lock};
+ io_pending.push_back(&ctx->item);
+ }
+
+ void io_finish(IOContext *ctx)
+ {
+ std::lock_guard l{lock};
+ ceph_assert(ctx->item.is_on_list());
+ ctx->item.remove_myself();
+ io_finished.push_back(&ctx->item);
+ cond.notify_all();
+ }
+
+ IOContext *wait_io_finish()
+ {
+ std::unique_lock l{lock};
+ cond.wait(l, [this] {
+ return !io_finished.empty() ||
+ (io_pending.empty() && terminated);
+ });
+
+ if (io_finished.empty())
+ return NULL;
+
+ IOContext *ret = io_finished.front();
+ io_finished.pop_front();
+
+ return ret;
+ }
+
+ void wait_clean()
+ {
+ std::unique_lock l{lock};
+ cond.wait(l, [this] { return io_pending.empty(); });
+
+ while(!io_finished.empty()) {
+ std::unique_ptr<IOContext> free_ctx(io_finished.front());
+ io_finished.pop_front();
+ }
+ }
+
+ void assert_clean()
+ {
+ std::unique_lock l{lock};
+
+ ceph_assert(!reader_thread.is_started());
+ ceph_assert(!writer_thread.is_started());
+ ceph_assert(io_pending.empty());
+ ceph_assert(io_finished.empty());
+ }
+
+ static void aio_callback(librbd::completion_t cb, void *arg)
+ {
+ librbd::RBD::AioCompletion *aio_completion =
+ reinterpret_cast<librbd::RBD::AioCompletion*>(cb);
+
+ IOContext *ctx = reinterpret_cast<IOContext *>(arg);
+ int ret = aio_completion->get_return_value();
+
+ dout(20) << __func__ << ": " << *ctx << dendl;
+
+ if (ret == -EINVAL) {
+ // if shrinking an image, a pagecache writeback might reference
+ // extents outside of the range of the new image extents
+ dout(0) << __func__ << ": masking IO out-of-bounds error" << dendl;
+ ctx->data.clear();
+ ret = 0;
+ }
+
+ if (ret < 0) {
+ ctx->reply.error = htonl(-ret);
+ } else if ((ctx->command == NBD_CMD_READ) &&
+ ret < static_cast<int>(ctx->request.len)) {
+ int pad_byte_count = static_cast<int> (ctx->request.len) - ret;
+ ctx->data.append_zero(pad_byte_count);
+ dout(20) << __func__ << ": " << *ctx << ": Pad byte count: "
+ << pad_byte_count << dendl;
+ ctx->reply.error = htonl(0);
+ } else {
+ ctx->reply.error = htonl(0);
+ }
+ ctx->server->io_finish(ctx);
+
+ aio_completion->release();
+ }
+
+ void reader_entry()
+ {
+ struct pollfd poll_fds[2];
+ memset(poll_fds, 0, sizeof(struct pollfd) * 2);
+ poll_fds[0].fd = fd;
+ poll_fds[0].events = POLLIN;
+ poll_fds[1].fd = terminate_event_fd;
+ poll_fds[1].events = POLLIN;
+
+ while (true) {
+ std::unique_ptr<IOContext> ctx(new IOContext());
+ ctx->server = this;
+
+ dout(20) << __func__ << ": waiting for nbd request" << dendl;
+
+ int r = poll(poll_fds, 2, -1);
+ if (r == -1) {
+ if (errno == EINTR) {
+ continue;
+ }
+ r = -errno;
+ derr << "failed to poll nbd: " << cpp_strerror(r) << dendl;
+ goto error;
+ }
+
+ if ((poll_fds[1].revents & POLLIN) != 0) {
+ dout(0) << __func__ << ": terminate received" << dendl;
+ goto signal;
+ }
+
+ if ((poll_fds[0].revents & POLLIN) == 0) {
+ dout(20) << __func__ << ": nothing to read" << dendl;
+ continue;
+ }
+
+ r = safe_read_exact(fd, &ctx->request, sizeof(struct nbd_request));
+ if (r < 0) {
+ derr << "failed to read nbd request header: " << cpp_strerror(r)
+ << dendl;
+ goto error;
+ }
+
+ if (ctx->request.magic != htonl(NBD_REQUEST_MAGIC)) {
+ derr << "invalid nbd request header" << dendl;
+ goto signal;
+ }
+
+ ctx->request.from = ntohll(ctx->request.from);
+ ctx->request.type = ntohl(ctx->request.type);
+ ctx->request.len = ntohl(ctx->request.len);
+
+ ctx->reply.magic = htonl(NBD_REPLY_MAGIC);
+ memcpy(ctx->reply.handle, ctx->request.handle, sizeof(ctx->reply.handle));
+
+ ctx->command = ctx->request.type & 0x0000ffff;
+
+ dout(20) << *ctx << ": start" << dendl;
+
+ switch (ctx->command)
+ {
+ case NBD_CMD_DISC:
+ // NBD_DO_IT will return when pipe is closed
+ dout(0) << "disconnect request received" << dendl;
+ goto signal;
+ case NBD_CMD_WRITE:
+ bufferptr ptr(ctx->request.len);
+ r = safe_read_exact(fd, ptr.c_str(), ctx->request.len);
+ if (r < 0) {
+ derr << *ctx << ": failed to read nbd request data: "
+ << cpp_strerror(r) << dendl;
+ goto error;
+ }
+ ctx->data.push_back(ptr);
+ break;
+ }
+
+ IOContext *pctx = ctx.release();
+ io_start(pctx);
+ librbd::RBD::AioCompletion *c = new librbd::RBD::AioCompletion(pctx, aio_callback);
+ switch (pctx->command)
+ {
+ case NBD_CMD_WRITE:
+ image.aio_write(pctx->request.from, pctx->request.len, pctx->data, c);
+ break;
+ case NBD_CMD_READ:
+ image.aio_read(pctx->request.from, pctx->request.len, pctx->data, c);
+ break;
+ case NBD_CMD_FLUSH:
+ image.aio_flush(c);
+ allow_internal_flush = true;
+ break;
+ case NBD_CMD_TRIM:
+ image.aio_discard(pctx->request.from, pctx->request.len, c);
+ break;
+ default:
+ derr << *pctx << ": invalid request command" << dendl;
+ c->release();
+ goto signal;
+ }
+ }
+error:
+ {
+ int r = netlink_disconnect(nbd_index);
+ if (r == 1) {
+ ioctl(nbd, NBD_DISCONNECT);
+ }
+ }
+signal:
+ std::lock_guard l{lock};
+ terminated = true;
+ cond.notify_all();
+
+ std::lock_guard disconnect_l{disconnect_lock};
+ disconnect_cond.notify_all();
+
+ dout(20) << __func__ << ": terminated" << dendl;
+ }
+
+ void writer_entry()
+ {
+ while (true) {
+ dout(20) << __func__ << ": waiting for io request" << dendl;
+ std::unique_ptr<IOContext> ctx(wait_io_finish());
+ if (!ctx) {
+ dout(20) << __func__ << ": no io requests, terminating" << dendl;
+ goto done;
+ }
+
+ dout(20) << __func__ << ": got: " << *ctx << dendl;
+
+ int r = safe_write(fd, &ctx->reply, sizeof(struct nbd_reply));
+ if (r < 0) {
+ derr << *ctx << ": failed to write reply header: " << cpp_strerror(r)
+ << dendl;
+ goto error;
+ }
+ if (ctx->command == NBD_CMD_READ && ctx->reply.error == htonl(0)) {
+ r = ctx->data.write_fd(fd);
+ if (r < 0) {
+ derr << *ctx << ": failed to write replay data: " << cpp_strerror(r)
+ << dendl;
+ goto error;
+ }
+ }
+ dout(20) << *ctx << ": finish" << dendl;
+ }
+ error:
+ wait_clean();
+ done:
+ ::shutdown(fd, SHUT_RDWR);
+
+ dout(20) << __func__ << ": terminated" << dendl;
+ }
+
+ bool wait_quiesce() {
+ dout(20) << __func__ << dendl;
+
+ std::unique_lock locker{lock};
+ cond.wait(locker, [this] { return quiesce || terminated; });
+
+ if (terminated) {
+ return false;
+ }
+
+ dout(20) << __func__ << ": got quiesce request" << dendl;
+ return true;
+ }
+
+ void wait_unquiesce(std::unique_lock<ceph::mutex> &locker) {
+ dout(20) << __func__ << dendl;
+
+ cond.wait(locker, [this] { return !quiesce || terminated; });
+
+ dout(20) << __func__ << ": got unquiesce request" << dendl;
+ }
+
+ void wait_inflight_io() {
+ if (!allow_internal_flush) {
+ return;
+ }
+
+ uint64_t features = 0;
+ image.features(&features);
+ if ((features & RBD_FEATURE_EXCLUSIVE_LOCK) != 0) {
+ bool is_owner = false;
+ image.is_exclusive_lock_owner(&is_owner);
+ if (!is_owner) {
+ return;
+ }
+ }
+
+ dout(20) << __func__ << dendl;
+
+ int r = image.flush();
+ if (r < 0) {
+ derr << "flush failed: " << cpp_strerror(r) << dendl;
+ }
+ }
+
+ void quiesce_entry()
+ {
+ ceph_assert(cfg->quiesce);
+
+ while (wait_quiesce()) {
+
+ int r = run_quiesce_hook(cfg->quiesce_hook, cfg->devpath, "quiesce");
+
+ wait_inflight_io();
+
+ {
+ std::unique_lock locker{lock};
+ ceph_assert(quiesce == true);
+
+ image.quiesce_complete(quiesce_watch_handle, r);
+
+ if (r < 0) {
+ quiesce = false;
+ continue;
+ }
+
+ wait_unquiesce(locker);
+ }
+
+ run_quiesce_hook(cfg->quiesce_hook, cfg->devpath, "unquiesce");
+ }
+
+ dout(20) << __func__ << ": terminated" << dendl;
+ }
+
+ class ThreadHelper : public Thread
+ {
+ public:
+ typedef void (NBDServer::*entry_func)();
+ private:
+ NBDServer &server;
+ entry_func func;
+ public:
+ ThreadHelper(NBDServer &_server, entry_func _func)
+ :server(_server)
+ ,func(_func)
+ {}
+ protected:
+ void* entry() override
+ {
+ (server.*func)();
+ return NULL;
+ }
+ } reader_thread, writer_thread, quiesce_thread;
+
+ bool started = false;
+ bool quiesce = false;
+
+public:
+ void start()
+ {
+ if (!started) {
+ dout(10) << __func__ << ": starting" << dendl;
+
+ started = true;
+
+ terminate_event_fd = eventfd(0, EFD_NONBLOCK);
+ ceph_assert(terminate_event_fd > 0);
+ int r = terminate_event_sock.init(terminate_event_fd,
+ EVENT_SOCKET_TYPE_EVENTFD);
+ ceph_assert(r >= 0);
+
+ reader_thread.create("rbd_reader");
+ writer_thread.create("rbd_writer");
+ if (cfg->quiesce) {
+ quiesce_thread.create("rbd_quiesce");
+ }
+ }
+ }
+
+ void wait_for_disconnect()
+ {
+ if (!started)
+ return;
+
+ std::unique_lock l{disconnect_lock};
+ disconnect_cond.wait(l);
+ }
+
+ void notify_quiesce() {
+ dout(10) << __func__ << dendl;
+
+ ceph_assert(cfg->quiesce);
+
+ std::unique_lock locker{lock};
+ ceph_assert(quiesce == false);
+ quiesce = true;
+ cond.notify_all();
+ }
+
+ void notify_unquiesce() {
+ dout(10) << __func__ << dendl;
+
+ ceph_assert(cfg->quiesce);
+
+ std::unique_lock locker{lock};
+ ceph_assert(quiesce == true);
+ quiesce = false;
+ cond.notify_all();
+ }
+
+ ~NBDServer()
+ {
+ if (started) {
+ dout(10) << __func__ << ": terminating" << dendl;
+
+ terminate_event_sock.notify();
+
+ reader_thread.join();
+ writer_thread.join();
+ if (cfg->quiesce) {
+ quiesce_thread.join();
+ }
+
+ assert_clean();
+
+ close(terminate_event_fd);
+ started = false;
+ }
+ }
+};
+
+std::ostream &operator<<(std::ostream &os, const NBDServer::IOContext &ctx) {
+
+ os << "[" << std::hex << ntohll(*((uint64_t *)ctx.request.handle));
+
+ switch (ctx.command)
+ {
+ case NBD_CMD_WRITE:
+ os << " WRITE ";
+ break;
+ case NBD_CMD_READ:
+ os << " READ ";
+ break;
+ case NBD_CMD_FLUSH:
+ os << " FLUSH ";
+ break;
+ case NBD_CMD_TRIM:
+ os << " TRIM ";
+ break;
+ case NBD_CMD_DISC:
+ os << " DISC ";
+ break;
+ default:
+ os << " UNKNOWN(" << ctx.command << ") ";
+ break;
+ }
+
+ os << ctx.request.from << "~" << ctx.request.len << " "
+ << std::dec << ntohl(ctx.reply.error) << "]";
+
+ return os;
+}
+
+class NBDQuiesceWatchCtx : public librbd::QuiesceWatchCtx
+{
+public:
+ NBDQuiesceWatchCtx(NBDServer *server) : server(server) {
+ }
+
+ void handle_quiesce() override {
+ server->notify_quiesce();
+ }
+
+ void handle_unquiesce() override {
+ server->notify_unquiesce();
+ }
+
+private:
+ NBDServer *server;
+};
+
+class NBDWatchCtx : public librbd::UpdateWatchCtx
+{
+private:
+ int fd;
+ int nbd_index;
+ bool use_netlink;
+ librados::IoCtx &io_ctx;
+ librbd::Image &image;
+ unsigned long size;
+public:
+ NBDWatchCtx(int _fd,
+ int _nbd_index,
+ bool _use_netlink,
+ librados::IoCtx &_io_ctx,
+ librbd::Image &_image,
+ unsigned long _size)
+ : fd(_fd)
+ , nbd_index(_nbd_index)
+ , use_netlink(_use_netlink)
+ , io_ctx(_io_ctx)
+ , image(_image)
+ , size(_size)
+ { }
+
+ ~NBDWatchCtx() override {}
+
+ void handle_notify() override
+ {
+ librbd::image_info_t info;
+ if (image.stat(info, sizeof(info)) == 0) {
+ unsigned long new_size = info.size;
+ int ret;
+
+ if (new_size != size) {
+ dout(5) << "resize detected" << dendl;
+ if (ioctl(fd, BLKFLSBUF, NULL) < 0)
+ derr << "invalidate page cache failed: " << cpp_strerror(errno)
+ << dendl;
+ if (use_netlink) {
+ ret = netlink_resize(nbd_index, new_size);
+ } else {
+ ret = ioctl(fd, NBD_SET_SIZE, new_size);
+ if (ret < 0)
+ derr << "resize failed: " << cpp_strerror(errno) << dendl;
+ }
+
+ if (!ret)
+ size = new_size;
+
+ if (ioctl(fd, BLKRRPART, NULL) < 0) {
+ derr << "rescan of partition table failed: " << cpp_strerror(errno)
+ << dendl;
+ }
+ if (image.invalidate_cache() < 0)
+ derr << "invalidate rbd cache failed" << dendl;
+ }
+ }
+ }
+};
+
+class NBDListIterator {
+public:
+ bool get(Config *cfg) {
+ while (true) {
+ std::string nbd_path = "/sys/block/nbd" + stringify(m_index);
+ if(access(nbd_path.c_str(), F_OK) != 0) {
+ return false;
+ }
+
+ *cfg = Config();
+ cfg->devpath = "/dev/nbd" + stringify(m_index++);
+
+ int pid;
+ std::ifstream ifs;
+ ifs.open(nbd_path + "/pid", std::ifstream::in);
+ if (!ifs.is_open()) {
+ continue;
+ }
+ ifs >> pid;
+ ifs.close();
+
+ // If the rbd-nbd is re-attached the pid may store garbage
+ // here. We are sure this is the case when it is negative or
+ // zero. Then we just try to find the attached process scanning
+ // /proc fs. If it is positive we check the process with this
+ // pid first and if it is not rbd-nbd fallback to searching the
+ // attached process.
+ do {
+ if (pid <= 0) {
+ pid = find_attached(cfg->devpath);
+ if (pid <= 0) {
+ break;
+ }
+ }
+
+ if (get_mapped_info(pid, cfg) >= 0) {
+ return true;
+ }
+ pid = -1;
+ } while (true);
+ }
+ }
+
+private:
+ int m_index = 0;
+ std::map<int, Config> m_mapped_info_cache;
+
+ int get_mapped_info(int pid, Config *cfg) {
+ ceph_assert(!cfg->devpath.empty());
+
+ auto it = m_mapped_info_cache.find(pid);
+ if (it != m_mapped_info_cache.end()) {
+ if (it->second.devpath != cfg->devpath) {
+ return -EINVAL;
+ }
+ *cfg = it->second;
+ return 0;
+ }
+
+ m_mapped_info_cache[pid] = {};
+
+ int r;
+ std::string path = "/proc/" + stringify(pid) + "/comm";
+ std::ifstream ifs;
+ std::string comm;
+ ifs.open(path.c_str(), std::ifstream::in);
+ if (!ifs.is_open())
+ return -1;
+ ifs >> comm;
+ if (comm != "rbd-nbd") {
+ return -EINVAL;
+ }
+ ifs.close();
+
+ path = "/proc/" + stringify(pid) + "/cmdline";
+ std::string cmdline;
+ std::vector<const char*> args;
+
+ ifs.open(path.c_str(), std::ifstream::in);
+ if (!ifs.is_open())
+ return -1;
+ ifs >> cmdline;
+
+ if (cmdline.empty()) {
+ return -EINVAL;
+ }
+
+ for (unsigned i = 0; i < cmdline.size(); i++) {
+ char *arg = &cmdline[i];
+ if (i == 0) {
+ if (strcmp(basename(arg) , "rbd-nbd") != 0) {
+ return -EINVAL;
+ }
+ } else {
+ args.push_back(arg);
+ }
+
+ while (cmdline[i] != '\0') {
+ i++;
+ }
+ }
+
+ std::ostringstream err_msg;
+ Config c;
+ r = parse_args(args, &err_msg, &c);
+ if (r < 0) {
+ return r;
+ }
+
+ if (c.command != Map && c.command != Attach) {
+ return -ENOENT;
+ }
+
+ c.pid = pid;
+ m_mapped_info_cache.erase(pid);
+ if (!c.devpath.empty()) {
+ m_mapped_info_cache[pid] = c;
+ if (c.devpath != cfg->devpath) {
+ return -ENOENT;
+ }
+ } else {
+ c.devpath = cfg->devpath;
+ }
+
+ c.cookie = get_cookie(cfg->devpath);
+ *cfg = c;
+ return 0;
+ }
+
+ int find_attached(const std::string &devpath) {
+ for (auto &entry : fs::directory_iterator("/proc")) {
+ if (!fs::is_directory(entry.status())) {
+ continue;
+ }
+
+ int pid;
+ try {
+ pid = boost::lexical_cast<uint64_t>(entry.path().filename().c_str());
+ } catch (boost::bad_lexical_cast&) {
+ continue;
+ }
+
+ Config cfg;
+ cfg.devpath = devpath;
+ if (get_mapped_info(pid, &cfg) >=0 && cfg.command == Attach) {
+ return cfg.pid;
+ }
+ }
+
+ return -1;
+ }
+};
+
+static std::string get_cookie(const std::string &devpath)
+{
+ std::string cookie;
+ std::ifstream ifs;
+ std::string path = "/sys/block/" + devpath.substr(sizeof("/dev/") - 1) + "/backend";
+
+ ifs.open(path, std::ifstream::in);
+ if (ifs.is_open()) {
+ std::getline(ifs, cookie);
+ ifs.close();
+ }
+ return cookie;
+}
+
+static int load_module(Config *cfg)
+{
+ ostringstream param;
+ int ret;
+
+ if (cfg->nbds_max)
+ param << "nbds_max=" << cfg->nbds_max;
+
+ if (cfg->max_part)
+ param << " max_part=" << cfg->max_part;
+
+ if (!access("/sys/module/nbd", F_OK)) {
+ if (cfg->nbds_max || cfg->set_max_part)
+ cerr << "rbd-nbd: ignoring kernel module parameter options: nbd module already loaded"
+ << std::endl;
+ return 0;
+ }
+
+ ret = module_load("nbd", param.str().c_str());
+ if (ret < 0)
+ cerr << "rbd-nbd: failed to load nbd kernel module: " << cpp_strerror(-ret)
+ << std::endl;
+
+ return ret;
+}
+
+static int check_device_size(int nbd_index, unsigned long expected_size)
+{
+ // There are bugs with some older kernel versions that result in an
+ // overflow for large image sizes. This check is to ensure we are
+ // not affected.
+
+ unsigned long size = 0;
+ std::string path = "/sys/block/nbd" + stringify(nbd_index) + "/size";
+ std::ifstream ifs;
+ ifs.open(path.c_str(), std::ifstream::in);
+ if (!ifs.is_open()) {
+ cerr << "rbd-nbd: failed to open " << path << std::endl;
+ return -EINVAL;
+ }
+ ifs >> size;
+ size *= RBD_NBD_BLKSIZE;
+
+ if (size == 0) {
+ // Newer kernel versions will report real size only after nbd
+ // connect. Assume this is the case and return success.
+ return 0;
+ }
+
+ if (size != expected_size) {
+ cerr << "rbd-nbd: kernel reported invalid device size (" << size
+ << ", expected " << expected_size << ")" << std::endl;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int parse_nbd_index(const std::string& devpath)
+{
+ int index, ret;
+
+ ret = sscanf(devpath.c_str(), "/dev/nbd%d", &index);
+ if (ret <= 0) {
+ // mean an early matching failure. But some cases need a negative value.
+ if (ret == 0)
+ ret = -EINVAL;
+ cerr << "rbd-nbd: invalid device path: " << devpath
+ << " (expected /dev/nbd{num})" << std::endl;
+ return ret;
+ }
+
+ return index;
+}
+
+static int try_ioctl_setup(Config *cfg, int fd, uint64_t size,
+ uint64_t blksize, uint64_t flags)
+{
+ int index = 0, r;
+
+ if (cfg->devpath.empty()) {
+ char dev[64];
+ const char *path = "/sys/module/nbd/parameters/nbds_max";
+ int nbds_max = -1;
+ if (access(path, F_OK) == 0) {
+ std::ifstream ifs;
+ ifs.open(path, std::ifstream::in);
+ if (ifs.is_open()) {
+ ifs >> nbds_max;
+ ifs.close();
+ }
+ }
+
+ while (true) {
+ snprintf(dev, sizeof(dev), "/dev/nbd%d", index);
+
+ nbd = open(dev, O_RDWR);
+ if (nbd < 0) {
+ if (nbd == -EPERM && nbds_max != -1 && index < (nbds_max-1)) {
+ ++index;
+ continue;
+ }
+ r = nbd;
+ cerr << "rbd-nbd: failed to find unused device" << std::endl;
+ goto done;
+ }
+
+ r = ioctl(nbd, NBD_SET_SOCK, fd);
+ if (r < 0) {
+ close(nbd);
+ ++index;
+ continue;
+ }
+
+ cfg->devpath = dev;
+ break;
+ }
+ } else {
+ r = parse_nbd_index(cfg->devpath);
+ if (r < 0)
+ goto done;
+ index = r;
+
+ nbd = open(cfg->devpath.c_str(), O_RDWR);
+ if (nbd < 0) {
+ r = nbd;
+ cerr << "rbd-nbd: failed to open device: " << cfg->devpath << std::endl;
+ goto done;
+ }
+
+ r = ioctl(nbd, NBD_SET_SOCK, fd);
+ if (r < 0) {
+ r = -errno;
+ cerr << "rbd-nbd: the device " << cfg->devpath << " is busy" << std::endl;
+ close(nbd);
+ goto done;
+ }
+ }
+
+ r = ioctl(nbd, NBD_SET_BLKSIZE, blksize);
+ if (r < 0) {
+ r = -errno;
+ cerr << "rbd-nbd: NBD_SET_BLKSIZE failed" << std::endl;
+ goto close_nbd;
+ }
+
+ r = ioctl(nbd, NBD_SET_SIZE, size);
+ if (r < 0) {
+ cerr << "rbd-nbd: NBD_SET_SIZE failed" << std::endl;
+ r = -errno;
+ goto close_nbd;
+ }
+
+ ioctl(nbd, NBD_SET_FLAGS, flags);
+
+ if (cfg->io_timeout >= 0) {
+ r = ioctl(nbd, NBD_SET_TIMEOUT, (unsigned long)cfg->io_timeout);
+ if (r < 0) {
+ r = -errno;
+ cerr << "rbd-nbd: failed to set IO timeout: " << cpp_strerror(r)
+ << std::endl;
+ goto close_nbd;
+ }
+ }
+
+ dout(10) << "ioctl setup complete for " << cfg->devpath << dendl;
+ nbd_index = index;
+ return 0;
+
+close_nbd:
+ if (r < 0) {
+ ioctl(nbd, NBD_CLEAR_SOCK);
+ cerr << "rbd-nbd: failed to map, status: " << cpp_strerror(-r) << std::endl;
+ }
+ close(nbd);
+done:
+ return r;
+}
+
+static void netlink_cleanup(struct nl_sock *sock)
+{
+ if (!sock)
+ return;
+
+ nl_close(sock);
+ nl_socket_free(sock);
+}
+
+static struct nl_sock *netlink_init(int *id)
+{
+ struct nl_sock *sock;
+ int ret;
+
+ sock = nl_socket_alloc();
+ if (!sock) {
+ cerr << "rbd-nbd: Could not allocate netlink socket." << std::endl;
+ return NULL;
+ }
+
+ ret = genl_connect(sock);
+ if (ret < 0) {
+ cerr << "rbd-nbd: Could not connect netlink socket. Error " << ret
+ << std::endl;
+ goto free_sock;
+ }
+
+ *id = genl_ctrl_resolve(sock, "nbd");
+ if (*id < 0)
+ // nbd netlink interface not supported.
+ goto close_sock;
+
+ return sock;
+
+close_sock:
+ nl_close(sock);
+free_sock:
+ nl_socket_free(sock);
+ return NULL;
+}
+
+static int netlink_disconnect(int index)
+{
+ struct nl_sock *sock;
+ struct nl_msg *msg;
+ int ret, nl_id;
+
+ sock = netlink_init(&nl_id);
+ if (!sock)
+ // Try ioctl
+ return 1;
+
+ nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, genl_handle_msg, NULL);
+
+ msg = nlmsg_alloc();
+ if (!msg) {
+ cerr << "rbd-nbd: Could not allocate netlink message." << std::endl;
+ goto free_sock;
+ }
+
+ if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl_id, 0, 0,
+ NBD_CMD_DISCONNECT, 0)) {
+ cerr << "rbd-nbd: Could not setup message." << std::endl;
+ goto nla_put_failure;
+ }
+
+ NLA_PUT_U32(msg, NBD_ATTR_INDEX, index);
+
+ ret = nl_send_sync(sock, msg);
+ netlink_cleanup(sock);
+ if (ret < 0) {
+ cerr << "rbd-nbd: netlink disconnect failed: " << nl_geterror(-ret)
+ << std::endl;
+ return -EIO;
+ }
+
+ return 0;
+
+nla_put_failure:
+ nlmsg_free(msg);
+free_sock:
+ netlink_cleanup(sock);
+ return -EIO;
+}
+
+static int netlink_disconnect_by_path(const std::string& devpath)
+{
+ int index;
+
+ index = parse_nbd_index(devpath);
+ if (index < 0)
+ return index;
+
+ return netlink_disconnect(index);
+}
+
+static int netlink_resize(int nbd_index, uint64_t size)
+{
+ struct nl_sock *sock;
+ struct nl_msg *msg;
+ int nl_id, ret;
+
+ sock = netlink_init(&nl_id);
+ if (!sock) {
+ cerr << "rbd-nbd: Netlink interface not supported." << std::endl;
+ return 1;
+ }
+
+ nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, genl_handle_msg, NULL);
+
+ msg = nlmsg_alloc();
+ if (!msg) {
+ cerr << "rbd-nbd: Could not allocate netlink message." << std::endl;
+ goto free_sock;
+ }
+
+ if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl_id, 0, 0,
+ NBD_CMD_RECONFIGURE, 0)) {
+ cerr << "rbd-nbd: Could not setup message." << std::endl;
+ goto free_msg;
+ }
+
+ NLA_PUT_U32(msg, NBD_ATTR_INDEX, nbd_index);
+ NLA_PUT_U64(msg, NBD_ATTR_SIZE_BYTES, size);
+
+ ret = nl_send_sync(sock, msg);
+ if (ret < 0) {
+ cerr << "rbd-nbd: netlink resize failed: " << nl_geterror(ret) << std::endl;
+ goto free_sock;
+ }
+
+ netlink_cleanup(sock);
+ dout(10) << "netlink resize complete for nbd" << nbd_index << dendl;
+ return 0;
+
+nla_put_failure:
+free_msg:
+ nlmsg_free(msg);
+free_sock:
+ netlink_cleanup(sock);
+ return -EIO;
+}
+
+static int netlink_connect_cb(struct nl_msg *msg, void *arg)
+{
+ struct genlmsghdr *gnlh = (struct genlmsghdr *)nlmsg_data(nlmsg_hdr(msg));
+ Config *cfg = (Config *)arg;
+ struct nlattr *msg_attr[NBD_ATTR_MAX + 1];
+ uint32_t index;
+ int ret;
+
+ ret = nla_parse(msg_attr, NBD_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+ if (ret) {
+ cerr << "rbd-nbd: Unsupported netlink reply" << std::endl;
+ return -NLE_MSGTYPE_NOSUPPORT;
+ }
+
+ if (!msg_attr[NBD_ATTR_INDEX]) {
+ cerr << "rbd-nbd: netlink connect reply missing device index." << std::endl;
+ return -NLE_MSGTYPE_NOSUPPORT;
+ }
+
+ index = nla_get_u32(msg_attr[NBD_ATTR_INDEX]);
+ cfg->devpath = "/dev/nbd" + stringify(index);
+ nbd_index = index;
+
+ return NL_OK;
+}
+
+static int netlink_connect(Config *cfg, struct nl_sock *sock, int nl_id, int fd,
+ uint64_t size, uint64_t flags, bool reconnect)
+{
+ struct nlattr *sock_attr;
+ struct nlattr *sock_opt;
+ struct nl_msg *msg;
+ int ret;
+
+ if (reconnect) {
+ dout(10) << "netlink try reconnect for " << cfg->devpath << dendl;
+
+ nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, genl_handle_msg, NULL);
+ } else {
+ nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, netlink_connect_cb,
+ cfg);
+ }
+
+ msg = nlmsg_alloc();
+ if (!msg) {
+ cerr << "rbd-nbd: Could not allocate netlink message." << std::endl;
+ return -ENOMEM;
+ }
+
+ if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl_id, 0, 0,
+ reconnect ? NBD_CMD_RECONFIGURE : NBD_CMD_CONNECT, 0)) {
+ cerr << "rbd-nbd: Could not setup message." << std::endl;
+ goto free_msg;
+ }
+
+ if (!cfg->devpath.empty()) {
+ ret = parse_nbd_index(cfg->devpath);
+ if (ret < 0)
+ goto free_msg;
+
+ NLA_PUT_U32(msg, NBD_ATTR_INDEX, ret);
+ if (reconnect) {
+ nbd_index = ret;
+ }
+ }
+
+ if (cfg->io_timeout >= 0)
+ NLA_PUT_U64(msg, NBD_ATTR_TIMEOUT, cfg->io_timeout);
+
+ NLA_PUT_U64(msg, NBD_ATTR_SIZE_BYTES, size);
+ NLA_PUT_U64(msg, NBD_ATTR_BLOCK_SIZE_BYTES, RBD_NBD_BLKSIZE);
+ NLA_PUT_U64(msg, NBD_ATTR_SERVER_FLAGS, flags);
+ NLA_PUT_U64(msg, NBD_ATTR_DEAD_CONN_TIMEOUT, cfg->reattach_timeout);
+ if (!cfg->cookie.empty())
+ NLA_PUT_STRING(msg, NBD_ATTR_BACKEND_IDENTIFIER, cfg->cookie.c_str());
+
+ sock_attr = nla_nest_start(msg, NBD_ATTR_SOCKETS);
+ if (!sock_attr) {
+ cerr << "rbd-nbd: Could not init sockets in netlink message." << std::endl;
+ goto free_msg;
+ }
+
+ sock_opt = nla_nest_start(msg, NBD_SOCK_ITEM);
+ if (!sock_opt) {
+ cerr << "rbd-nbd: Could not init sock in netlink message." << std::endl;
+ goto free_msg;
+ }
+
+ NLA_PUT_U32(msg, NBD_SOCK_FD, fd);
+ nla_nest_end(msg, sock_opt);
+ nla_nest_end(msg, sock_attr);
+
+ ret = nl_send_sync(sock, msg);
+ if (ret < 0) {
+ cerr << "rbd-nbd: netlink connect failed: " << nl_geterror(ret)
+ << std::endl;
+ return -EIO;
+ }
+
+ dout(10) << "netlink connect complete for " << cfg->devpath << dendl;
+ return 0;
+
+nla_put_failure:
+free_msg:
+ nlmsg_free(msg);
+ return -EIO;
+}
+
+static int try_netlink_setup(Config *cfg, int fd, uint64_t size, uint64_t flags,
+ bool reconnect)
+{
+ struct nl_sock *sock;
+ int nl_id, ret;
+
+ sock = netlink_init(&nl_id);
+ if (!sock) {
+ cerr << "rbd-nbd: Netlink interface not supported. Using ioctl interface."
+ << std::endl;
+ return 1;
+ }
+
+ dout(10) << "netlink interface supported." << dendl;
+
+ ret = netlink_connect(cfg, sock, nl_id, fd, size, flags, reconnect);
+ netlink_cleanup(sock);
+
+ if (ret != 0)
+ return ret;
+
+ nbd = open(cfg->devpath.c_str(), O_RDWR);
+ if (nbd < 0) {
+ cerr << "rbd-nbd: failed to open device: " << cfg->devpath << std::endl;
+ return nbd;
+ }
+
+ return 0;
+}
+
+static int run_quiesce_hook(const std::string &quiesce_hook,
+ const std::string &devpath,
+ const std::string &command) {
+ dout(10) << __func__ << ": " << quiesce_hook << " " << devpath << " "
+ << command << dendl;
+
+ SubProcess hook(quiesce_hook.c_str(), SubProcess::CLOSE, SubProcess::PIPE,
+ SubProcess::PIPE);
+ hook.add_cmd_args(devpath.c_str(), command.c_str(), NULL);
+ bufferlist err;
+ int r = hook.spawn();
+ if (r < 0) {
+ err.append("subprocess spawn failed");
+ } else {
+ err.read_fd(hook.get_stderr(), 16384);
+ r = hook.join();
+ if (r > 0) {
+ r = -r;
+ }
+ }
+ if (r < 0) {
+ derr << __func__ << ": " << quiesce_hook << " " << devpath << " "
+ << command << " failed: " << err.to_str() << dendl;
+ } else {
+ dout(10) << " succeeded: " << err.to_str() << dendl;
+ }
+
+ return r;
+}
+
+static void handle_signal(int signum)
+{
+ ceph_assert(signum == SIGINT || signum == SIGTERM);
+ derr << "*** Got signal " << sig_str(signum) << " ***" << dendl;
+
+ dout(20) << __func__ << ": " << "notifying terminate" << dendl;
+
+ ceph_assert(terminate_event_sock.is_valid());
+ terminate_event_sock.notify();
+}
+
+static NBDServer *start_server(int fd, librbd::Image& image, Config *cfg)
+{
+ NBDServer *server;
+
+ server = new NBDServer(fd, image, cfg);
+ server->start();
+
+ init_async_signal_handler();
+ register_async_signal_handler(SIGHUP, sighup_handler);
+ register_async_signal_handler_oneshot(SIGINT, handle_signal);
+ register_async_signal_handler_oneshot(SIGTERM, handle_signal);
+
+ return server;
+}
+
+static void run_server(Preforker& forker, NBDServer *server, bool netlink_used)
+{
+ if (g_conf()->daemonize) {
+ global_init_postfork_finish(g_ceph_context);
+ forker.daemonize();
+ }
+
+ if (netlink_used)
+ server->wait_for_disconnect();
+ else
+ ioctl(nbd, NBD_DO_IT);
+
+ unregister_async_signal_handler(SIGHUP, sighup_handler);
+ unregister_async_signal_handler(SIGINT, handle_signal);
+ unregister_async_signal_handler(SIGTERM, handle_signal);
+ shutdown_async_signal_handler();
+}
+
+// Eventually it should be removed when pidfd_open is widely supported.
+
+static int wait_for_terminate_legacy(int pid, int timeout)
+{
+ for (int i = 0; ; i++) {
+ if (kill(pid, 0) == -1) {
+ if (errno == ESRCH) {
+ return 0;
+ }
+ int r = -errno;
+ cerr << "rbd-nbd: kill(" << pid << ", 0) failed: "
+ << cpp_strerror(r) << std::endl;
+ return r;
+ }
+ if (i >= timeout * 2) {
+ break;
+ }
+ usleep(500000);
+ }
+
+ cerr << "rbd-nbd: waiting for process exit timed out" << std::endl;
+ return -ETIMEDOUT;
+}
+
+// Eventually it should be replaced with glibc' pidfd_open
+// when it is widely available.
+
+#ifdef __NR_pidfd_open
+static int pidfd_open(pid_t pid, unsigned int flags)
+{
+ return syscall(__NR_pidfd_open, pid, flags);
+}
+#else
+static int pidfd_open(pid_t pid, unsigned int flags)
+{
+ errno = ENOSYS;
+ return -1;
+}
+#endif
+
+static int wait_for_terminate(int pid, int timeout)
+{
+ int fd = pidfd_open(pid, 0);
+ if (fd == -1) {
+ if (errno == ENOSYS) {
+ return wait_for_terminate_legacy(pid, timeout);
+ }
+ if (errno == ESRCH) {
+ return 0;
+ }
+ int r = -errno;
+ cerr << "rbd-nbd: pidfd_open(" << pid << ") failed: "
+ << cpp_strerror(r) << std::endl;
+ return r;
+ }
+
+ struct pollfd poll_fds[1];
+ memset(poll_fds, 0, sizeof(struct pollfd));
+ poll_fds[0].fd = fd;
+ poll_fds[0].events = POLLIN;
+
+ int r = poll(poll_fds, 1, timeout * 1000);
+ if (r == -1) {
+ r = -errno;
+ cerr << "rbd-nbd: failed to poll rbd-nbd process: " << cpp_strerror(r)
+ << std::endl;
+ goto done;
+ } else {
+ r = 0;
+ }
+
+ if ((poll_fds[0].revents & POLLIN) == 0) {
+ cerr << "rbd-nbd: waiting for process exit timed out" << std::endl;
+ r = -ETIMEDOUT;
+ }
+
+done:
+ close(fd);
+
+ return r;
+}
+
+static int do_map(int argc, const char *argv[], Config *cfg, bool reconnect)
+{
+ int r;
+
+ librados::Rados rados;
+ librbd::RBD rbd;
+ librados::IoCtx io_ctx;
+ librbd::Image image;
+
+ int read_only = 0;
+ unsigned long flags;
+ unsigned long size;
+ unsigned long blksize = RBD_NBD_BLKSIZE;
+ bool use_netlink;
+
+ int fd[2];
+
+ librbd::image_info_t info;
+
+ Preforker forker;
+ NBDServer *server;
+
+ vector<const char*> args;
+ argv_to_vec(argc, argv, args);
+ if (args.empty()) {
+ cerr << argv[0] << ": -h or --help for usage" << std::endl;
+ exit(1);
+ }
+ if (ceph_argparse_need_usage(args)) {
+ usage();
+ exit(0);
+ }
+
+ auto cct = global_init(NULL, args, CEPH_ENTITY_TYPE_CLIENT,
+ CODE_ENVIRONMENT_DAEMON,
+ CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS);
+ g_ceph_context->_conf.set_val_or_die("pid_file", "");
+
+ if (global_init_prefork(g_ceph_context) >= 0) {
+ std::string err;
+ r = forker.prefork(err);
+ if (r < 0) {
+ cerr << err << std::endl;
+ return r;
+ }
+ if (forker.is_parent()) {
+ if (forker.parent_wait(err) != 0) {
+ return -ENXIO;
+ }
+ return 0;
+ }
+ global_init_postfork_start(g_ceph_context);
+ }
+
+ common_init_finish(g_ceph_context);
+ global_init_chdir(g_ceph_context);
+
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) == -1) {
+ r = -errno;
+ goto close_ret;
+ }
+
+ r = rados.init_with_context(g_ceph_context);
+ if (r < 0)
+ goto close_fd;
+
+ r = rados.connect();
+ if (r < 0)
+ goto close_fd;
+
+ r = rados.ioctx_create(cfg->poolname.c_str(), io_ctx);
+ if (r < 0)
+ goto close_fd;
+
+ io_ctx.set_namespace(cfg->nsname);
+
+ r = rbd.open(io_ctx, image, cfg->imgname.c_str());
+ if (r < 0)
+ goto close_fd;
+
+ if (cfg->exclusive) {
+ r = image.lock_acquire(RBD_LOCK_MODE_EXCLUSIVE);
+ if (r < 0) {
+ cerr << "rbd-nbd: failed to acquire exclusive lock: " << cpp_strerror(r)
+ << std::endl;
+ goto close_fd;
+ }
+ }
+
+ if (!cfg->snapname.empty()) {
+ r = image.snap_set(cfg->snapname.c_str());
+ if (r < 0)
+ goto close_fd;
+ }
+
+ if (cfg->encryption_format.has_value()) {
+ if (!cfg->encryption_passphrase_file.has_value()) {
+ r = -EINVAL;
+ cerr << "rbd-nbd: missing encryption-passphrase-file" << std::endl;
+ goto close_fd;
+ }
+ std::ifstream file(cfg->encryption_passphrase_file.value().c_str());
+ if (file.fail()) {
+ r = -errno;
+ std::cerr << "rbd-nbd: unable to open passphrase file:"
+ << cpp_strerror(errno) << std::endl;
+ goto close_fd;
+ }
+ std::string passphrase((std::istreambuf_iterator<char>(file)),
+ (std::istreambuf_iterator<char>()));
+ auto sg = make_scope_guard([&] {
+ ceph_memzero_s(&passphrase[0], passphrase.size(), passphrase.size()); });
+ file.close();
+ if (!passphrase.empty() && passphrase[passphrase.length() - 1] == '\n') {
+ passphrase.erase(passphrase.length() - 1);
+ }
+
+ switch (cfg->encryption_format.value()) {
+ case RBD_ENCRYPTION_FORMAT_LUKS1: {
+ librbd::encryption_luks1_format_options_t opts = {};
+ opts.passphrase = passphrase;
+ r = image.encryption_load(
+ RBD_ENCRYPTION_FORMAT_LUKS1, &opts, sizeof(opts));
+ break;
+ }
+ case RBD_ENCRYPTION_FORMAT_LUKS2: {
+ librbd::encryption_luks2_format_options_t opts = {};
+ opts.passphrase = passphrase;
+ r = image.encryption_load(
+ RBD_ENCRYPTION_FORMAT_LUKS2, &opts, sizeof(opts));
+ blksize = 4096;
+ break;
+ }
+ default:
+ r = -ENOTSUP;
+ cerr << "rbd-nbd: unsupported encryption format" << std::endl;
+ goto close_fd;
+ }
+
+ if (r != 0) {
+ cerr << "rbd-nbd: failed to load encryption: " << cpp_strerror(r)
+ << std::endl;
+ goto close_fd;
+ }
+ }
+
+ r = image.stat(info, sizeof(info));
+ if (r < 0)
+ goto close_fd;
+
+ flags = NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_TRIM | NBD_FLAG_HAS_FLAGS;
+ if (!cfg->snapname.empty() || cfg->readonly) {
+ flags |= NBD_FLAG_READ_ONLY;
+ read_only = 1;
+ }
+
+ if (info.size > ULONG_MAX) {
+ r = -EFBIG;
+ cerr << "rbd-nbd: image is too large (" << byte_u_t(info.size)
+ << ", max is " << byte_u_t(ULONG_MAX) << ")" << std::endl;
+ goto close_fd;
+ }
+
+ size = info.size;
+
+ r = load_module(cfg);
+ if (r < 0)
+ goto close_fd;
+
+ server = start_server(fd[1], image, cfg);
+
+ use_netlink = cfg->try_netlink || reconnect;
+ if (use_netlink) {
+ // generate when the cookie is not supplied at CLI
+ if (!reconnect && cfg->cookie.empty()) {
+ uuid_d uuid_gen;
+ uuid_gen.generate_random();
+ cfg->cookie = uuid_gen.to_string();
+ }
+ r = try_netlink_setup(cfg, fd[0], size, flags, reconnect);
+ if (r < 0) {
+ goto free_server;
+ } else if (r == 1) {
+ use_netlink = false;
+ }
+ }
+
+ if (!use_netlink) {
+ r = try_ioctl_setup(cfg, fd[0], size, blksize, flags);
+ if (r < 0)
+ goto free_server;
+ }
+
+ r = check_device_size(nbd_index, size);
+ if (r < 0)
+ goto close_nbd;
+
+ r = ioctl(nbd, BLKROSET, (unsigned long) &read_only);
+ if (r < 0) {
+ r = -errno;
+ goto close_nbd;
+ }
+
+ {
+ NBDQuiesceWatchCtx quiesce_watch_ctx(server);
+ if (cfg->quiesce) {
+ r = image.quiesce_watch(&quiesce_watch_ctx,
+ &server->quiesce_watch_handle);
+ if (r < 0) {
+ goto close_nbd;
+ }
+ }
+
+ uint64_t handle;
+
+ NBDWatchCtx watch_ctx(nbd, nbd_index, use_netlink, io_ctx, image,
+ info.size);
+ r = image.update_watch(&watch_ctx, &handle);
+ if (r < 0)
+ goto close_nbd;
+
+ std::string cookie;
+ if (use_netlink) {
+ cookie = get_cookie(cfg->devpath);
+ ceph_assert(cookie == cfg->cookie || cookie.empty());
+ }
+ if (cfg->show_cookie && !cookie.empty()) {
+ cout << cfg->devpath << " " << cookie << std::endl;
+ } else {
+ cout << cfg->devpath << std::endl;
+ }
+
+ run_server(forker, server, use_netlink);
+
+ if (cfg->quiesce) {
+ r = image.quiesce_unwatch(server->quiesce_watch_handle);
+ ceph_assert(r == 0);
+ }
+
+ r = image.update_unwatch(handle);
+ ceph_assert(r == 0);
+ }
+
+close_nbd:
+ if (r < 0) {
+ if (use_netlink) {
+ netlink_disconnect(nbd_index);
+ } else {
+ ioctl(nbd, NBD_CLEAR_SOCK);
+ cerr << "rbd-nbd: failed to map, status: " << cpp_strerror(-r)
+ << std::endl;
+ }
+ }
+ close(nbd);
+free_server:
+ delete server;
+close_fd:
+ close(fd[0]);
+ close(fd[1]);
+close_ret:
+ image.close();
+ io_ctx.close();
+ rados.shutdown();
+
+ forker.exit(r < 0 ? EXIT_FAILURE : 0);
+ // Unreachable;
+ return r;
+}
+
+static int do_detach(Config *cfg)
+{
+ int r = kill(cfg->pid, SIGTERM);
+ if (r == -1) {
+ r = -errno;
+ cerr << "rbd-nbd: failed to terminate " << cfg->pid << ": "
+ << cpp_strerror(r) << std::endl;
+ return r;
+ }
+
+ return wait_for_terminate(cfg->pid, cfg->reattach_timeout);
+}
+
+static int do_unmap(Config *cfg)
+{
+ /*
+ * The netlink disconnect call supports devices setup with netlink or ioctl,
+ * so we always try that first.
+ */
+ int r = netlink_disconnect_by_path(cfg->devpath);
+ if (r < 0) {
+ return r;
+ }
+
+ if (r == 1) {
+ int nbd = open(cfg->devpath.c_str(), O_RDWR);
+ if (nbd < 0) {
+ cerr << "rbd-nbd: failed to open device: " << cfg->devpath << std::endl;
+ return nbd;
+ }
+
+ r = ioctl(nbd, NBD_DISCONNECT);
+ if (r < 0) {
+ cerr << "rbd-nbd: the device is not used" << std::endl;
+ }
+
+ close(nbd);
+
+ if (r < 0) {
+ return r;
+ }
+ }
+
+ if (cfg->pid > 0) {
+ r = wait_for_terminate(cfg->pid, cfg->reattach_timeout);
+ }
+
+ return 0;
+}
+
+static int parse_imgpath(const std::string &imgpath, Config *cfg,
+ std::ostream *err_msg) {
+ std::regex pattern("^(?:([^/]+)/(?:([^/@]+)/)?)?([^@]+)(?:@([^/@]+))?$");
+ std::smatch match;
+ if (!std::regex_match(imgpath, match, pattern)) {
+ std::cerr << "rbd-nbd: invalid spec '" << imgpath << "'" << std::endl;
+ return -EINVAL;
+ }
+
+ if (match[1].matched) {
+ cfg->poolname = match[1];
+ }
+
+ if (match[2].matched) {
+ cfg->nsname = match[2];
+ }
+
+ cfg->imgname = match[3];
+
+ if (match[4].matched)
+ cfg->snapname = match[4];
+
+ return 0;
+}
+
+static int do_list_mapped_devices(const std::string &format, bool pretty_format)
+{
+ bool should_print = false;
+ std::unique_ptr<ceph::Formatter> f;
+ TextTable tbl;
+
+ if (format == "json") {
+ f.reset(new JSONFormatter(pretty_format));
+ } else if (format == "xml") {
+ f.reset(new XMLFormatter(pretty_format));
+ } else if (!format.empty() && format != "plain") {
+ std::cerr << "rbd-nbd: invalid output format: " << format << std::endl;
+ return -EINVAL;
+ }
+
+ if (f) {
+ f->open_array_section("devices");
+ } else {
+ tbl.define_column("id", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("pool", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("namespace", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("image", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("snap", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("device", TextTable::LEFT, TextTable::LEFT);
+ tbl.define_column("cookie", TextTable::LEFT, TextTable::LEFT);
+ }
+
+ Config cfg;
+ NBDListIterator it;
+ while (it.get(&cfg)) {
+ if (f) {
+ f->open_object_section("device");
+ f->dump_int("id", cfg.pid);
+ f->dump_string("pool", cfg.poolname);
+ f->dump_string("namespace", cfg.nsname);
+ f->dump_string("image", cfg.imgname);
+ f->dump_string("snap", cfg.snapname);
+ f->dump_string("device", cfg.devpath);
+ f->dump_string("cookie", cfg.cookie);
+ f->close_section();
+ } else {
+ should_print = true;
+ if (cfg.snapname.empty()) {
+ cfg.snapname = "-";
+ }
+ tbl << cfg.pid << cfg.poolname << cfg.nsname << cfg.imgname
+ << cfg.snapname << cfg.devpath << cfg.cookie << TextTable::endrow;
+ }
+ }
+
+ if (f) {
+ f->close_section(); // devices
+ f->flush(std::cout);
+ }
+ if (should_print) {
+ std::cout << tbl;
+ }
+ return 0;
+}
+
+static bool find_mapped_dev_by_spec(Config *cfg, int skip_pid=-1) {
+ Config c;
+ NBDListIterator it;
+ while (it.get(&c)) {
+ if (c.pid != skip_pid &&
+ c.poolname == cfg->poolname && c.nsname == cfg->nsname &&
+ c.imgname == cfg->imgname && c.snapname == cfg->snapname &&
+ (cfg->devpath.empty() || c.devpath == cfg->devpath)) {
+ *cfg = c;
+ return true;
+ }
+ }
+ return false;
+}
+
+static int find_proc_by_dev(Config *cfg) {
+ Config c;
+ NBDListIterator it;
+ while (it.get(&c)) {
+ if (c.devpath == cfg->devpath) {
+ *cfg = c;
+ return true;
+ }
+ }
+ return false;
+}
+
+static int parse_args(vector<const char*>& args, std::ostream *err_msg,
+ Config *cfg) {
+ std::string conf_file_list;
+ std::string cluster;
+ CephInitParameters iparams = ceph_argparse_early_args(
+ args, CEPH_ENTITY_TYPE_CLIENT, &cluster, &conf_file_list);
+
+ ConfigProxy config{false};
+ config->name = iparams.name;
+ config->cluster = cluster;
+
+ if (!conf_file_list.empty()) {
+ config.parse_config_files(conf_file_list.c_str(), nullptr, 0);
+ } else {
+ config.parse_config_files(nullptr, nullptr, 0);
+ }
+ config.parse_env(CEPH_ENTITY_TYPE_CLIENT);
+ config.parse_argv(args);
+ cfg->poolname = config.get_val<std::string>("rbd_default_pool");
+
+ std::vector<const char*>::iterator i;
+ std::ostringstream err;
+ std::string arg_value;
+
+ for (i = args.begin(); i != args.end(); ) {
+ if (ceph_argparse_flag(args, i, "-h", "--help", (char*)NULL)) {
+ return HELP_INFO;
+ } else if (ceph_argparse_flag(args, i, "-v", "--version", (char*)NULL)) {
+ return VERSION_INFO;
+ } else if (ceph_argparse_witharg(args, i, &cfg->devpath, "--device", (char *)NULL)) {
+ } else if (ceph_argparse_witharg(args, i, &cfg->io_timeout, err,
+ "--io-timeout", (char *)NULL)) {
+ if (!err.str().empty()) {
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
+ }
+ if (cfg->io_timeout < 0) {
+ *err_msg << "rbd-nbd: Invalid argument for io-timeout!";
+ return -EINVAL;
+ }
+ } else if (ceph_argparse_witharg(args, i, &cfg->nbds_max, err, "--nbds_max", (char *)NULL)) {
+ if (!err.str().empty()) {
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
+ }
+ if (cfg->nbds_max < 0) {
+ *err_msg << "rbd-nbd: Invalid argument for nbds_max!";
+ return -EINVAL;
+ }
+ } else if (ceph_argparse_witharg(args, i, &cfg->max_part, err, "--max_part", (char *)NULL)) {
+ if (!err.str().empty()) {
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
+ }
+ if ((cfg->max_part < 0) || (cfg->max_part > 255)) {
+ *err_msg << "rbd-nbd: Invalid argument for max_part(0~255)!";
+ return -EINVAL;
+ }
+ cfg->set_max_part = true;
+ } else if (ceph_argparse_flag(args, i, "--quiesce", (char *)NULL)) {
+ cfg->quiesce = true;
+ } else if (ceph_argparse_witharg(args, i, &cfg->quiesce_hook,
+ "--quiesce-hook", (char *)NULL)) {
+ } else if (ceph_argparse_flag(args, i, "--read-only", (char *)NULL)) {
+ cfg->readonly = true;
+ } else if (ceph_argparse_witharg(args, i, &cfg->reattach_timeout, err,
+ "--reattach-timeout", (char *)NULL)) {
+ if (!err.str().empty()) {
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
+ }
+ if (cfg->reattach_timeout < 0) {
+ *err_msg << "rbd-nbd: Invalid argument for reattach-timeout!";
+ return -EINVAL;
+ }
+ } else if (ceph_argparse_flag(args, i, "--exclusive", (char *)NULL)) {
+ cfg->exclusive = true;
+ } else if (ceph_argparse_witharg(args, i, &cfg->io_timeout, err,
+ "--timeout", (char *)NULL)) {
+ if (!err.str().empty()) {
+ *err_msg << "rbd-nbd: " << err.str();
+ return -EINVAL;
+ }
+ if (cfg->io_timeout < 0) {
+ *err_msg << "rbd-nbd: Invalid argument for timeout!";
+ return -EINVAL;
+ }
+ *err_msg << "rbd-nbd: --timeout is deprecated (use --io-timeout)";
+ } else if (ceph_argparse_witharg(args, i, &cfg->format, err, "--format",
+ (char *)NULL)) {
+ } else if (ceph_argparse_flag(args, i, "--pretty-format", (char *)NULL)) {
+ cfg->pretty_format = true;
+ } else if (ceph_argparse_flag(args, i, "--try-netlink", (char *)NULL)) {
+ cfg->try_netlink = true;
+ } else if (ceph_argparse_flag(args, i, "--show-cookie", (char *)NULL)) {
+ cfg->show_cookie = true;
+ } else if (ceph_argparse_witharg(args, i, &cfg->cookie, "--cookie", (char *)NULL)) {
+ } else if (ceph_argparse_witharg(args, i, &arg_value,
+ "--encryption-format", (char *)NULL)) {
+ if (arg_value == "luks1") {
+ cfg->encryption_format =
+ std::make_optional(RBD_ENCRYPTION_FORMAT_LUKS1);
+ } else if (arg_value == "luks2") {
+ cfg->encryption_format =
+ std::make_optional(RBD_ENCRYPTION_FORMAT_LUKS2);
+ } else {
+ *err_msg << "rbd-nbd: Invalid encryption format";
+ return -EINVAL;
+ }
+ } else if (ceph_argparse_witharg(args, i, &arg_value,
+ "--encryption-passphrase-file",
+ (char *)NULL)) {
+ cfg->encryption_passphrase_file = std::make_optional(arg_value);
+ } else {
+ ++i;
+ }
+ }
+
+ Command cmd = None;
+ if (args.begin() != args.end()) {
+ if (strcmp(*args.begin(), "map") == 0) {
+ cmd = Map;
+ } else if (strcmp(*args.begin(), "unmap") == 0) {
+ cmd = Unmap;
+ } else if (strcmp(*args.begin(), "attach") == 0) {
+ cmd = Attach;
+ } else if (strcmp(*args.begin(), "detach") == 0) {
+ cmd = Detach;
+ } else if (strcmp(*args.begin(), "list-mapped") == 0) {
+ cmd = List;
+ } else {
+ *err_msg << "rbd-nbd: unknown command: " << *args.begin();
+ return -EINVAL;
+ }
+ args.erase(args.begin());
+ }
+
+ if (cmd == None) {
+ *err_msg << "rbd-nbd: must specify command";
+ return -EINVAL;
+ }
+
+ std::string cookie;
+ switch (cmd) {
+ case Attach:
+ if (cfg->devpath.empty()) {
+ *err_msg << "rbd-nbd: must specify device to attach";
+ return -EINVAL;
+ }
+ // Allowing attach without --cookie option for kernel without
+ // NBD_ATTR_BACKEND_IDENTIFIER support for compatibility
+ cookie = get_cookie(cfg->devpath);
+ if (!cookie.empty()) {
+ if (cfg->cookie.empty()) {
+ *err_msg << "rbd-nbd: must specify cookie to attach";
+ return -EINVAL;
+ } else if (cookie != cfg->cookie) {
+ *err_msg << "rbd-nbd: cookie mismatch";
+ return -EINVAL;
+ }
+ } else if (!cfg->cookie.empty()) {
+ *err_msg << "rbd-nbd: kernel does not have cookie support";
+ return -EINVAL;
+ }
+ [[fallthrough]];
+ case Map:
+ if (args.begin() == args.end()) {
+ *err_msg << "rbd-nbd: must specify image-or-snap-spec";
+ return -EINVAL;
+ }
+ if (parse_imgpath(*args.begin(), cfg, err_msg) < 0) {
+ return -EINVAL;
+ }
+ args.erase(args.begin());
+ break;
+ case Detach:
+ case Unmap:
+ if (args.begin() == args.end()) {
+ *err_msg << "rbd-nbd: must specify nbd device or image-or-snap-spec";
+ return -EINVAL;
+ }
+ if (boost::starts_with(*args.begin(), "/dev/")) {
+ cfg->devpath = *args.begin();
+ } else {
+ if (parse_imgpath(*args.begin(), cfg, err_msg) < 0) {
+ return -EINVAL;
+ }
+ }
+ args.erase(args.begin());
+ break;
+ default:
+ //shut up gcc;
+ break;
+ }
+
+ if (args.begin() != args.end()) {
+ *err_msg << "rbd-nbd: unknown args: " << *args.begin();
+ return -EINVAL;
+ }
+
+ cfg->command = cmd;
+ return 0;
+}
+
+static int rbd_nbd(int argc, const char *argv[])
+{
+ int r;
+ Config cfg;
+ vector<const char*> args;
+ argv_to_vec(argc, argv, args);
+
+ std::ostringstream err_msg;
+ r = parse_args(args, &err_msg, &cfg);
+ if (r == HELP_INFO) {
+ usage();
+ return 0;
+ } else if (r == VERSION_INFO) {
+ std::cout << pretty_version_to_str() << std::endl;
+ return 0;
+ } else if (r < 0) {
+ cerr << err_msg.str() << std::endl;
+ return r;
+ }
+
+ if (!err_msg.str().empty()) {
+ cerr << err_msg.str() << std::endl;
+ }
+
+ switch (cfg.command) {
+ case Attach:
+ ceph_assert(!cfg.devpath.empty());
+ if (find_mapped_dev_by_spec(&cfg, getpid())) {
+ cerr << "rbd-nbd: " << cfg.devpath << " has process " << cfg.pid
+ << " connected" << std::endl;
+ return -EBUSY;
+ }
+ [[fallthrough]];
+ case Map:
+ if (cfg.imgname.empty()) {
+ cerr << "rbd-nbd: image name was not specified" << std::endl;
+ return -EINVAL;
+ }
+
+ r = do_map(argc, argv, &cfg, cfg.command == Attach);
+ if (r < 0)
+ return -EINVAL;
+ break;
+ case Detach:
+ if (cfg.devpath.empty()) {
+ if (!find_mapped_dev_by_spec(&cfg)) {
+ cerr << "rbd-nbd: " << cfg.image_spec() << " is not mapped"
+ << std::endl;
+ return -ENOENT;
+ }
+ } else if (!find_proc_by_dev(&cfg)) {
+ cerr << "rbd-nbd: no process attached to " << cfg.devpath << " found"
+ << std::endl;
+ return -ENOENT;
+ }
+ r = do_detach(&cfg);
+ if (r < 0)
+ return -EINVAL;
+ break;
+ case Unmap:
+ if (cfg.devpath.empty()) {
+ if (!find_mapped_dev_by_spec(&cfg)) {
+ cerr << "rbd-nbd: " << cfg.image_spec() << " is not mapped"
+ << std::endl;
+ return -ENOENT;
+ }
+ } else if (!find_proc_by_dev(&cfg)) {
+ // still try to send disconnect to the device
+ }
+ r = do_unmap(&cfg);
+ if (r < 0)
+ return -EINVAL;
+ break;
+ case List:
+ r = do_list_mapped_devices(cfg.format, cfg.pretty_format);
+ if (r < 0)
+ return -EINVAL;
+ break;
+ default:
+ usage();
+ break;
+ }
+
+ return 0;
+}
+
+int main(int argc, const char *argv[])
+{
+ int r = rbd_nbd(argc, argv);
+ if (r < 0) {
+ return EXIT_FAILURE;
+ }
+ return 0;
+}
diff --git a/src/tools/rbd_nbd/rbd-nbd_quiesce b/src/tools/rbd_nbd/rbd-nbd_quiesce
new file mode 100755
index 000000000..a62a12b15
--- /dev/null
+++ b/src/tools/rbd_nbd/rbd-nbd_quiesce
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+echo "$0 $@" >&2
+
+if [ $# -lt 2 ]; then
+ echo "usage: $0 <dev> <cmd>" >&2
+ exit 1
+fi
+
+dev=$1
+cmd=$2
+
+export PATH=/usr/sbin:/usr/bin:/sbin:/bin
+
+findmnt -S "${dev}" -fno TARGET |
+while read mnt; do
+ case "${cmd}" in
+ quiesce)
+ echo "freezing ${mnt}" >&2
+ fsfreeze -f "${mnt}"
+ ;;
+ unquiesce)
+ echo "unfreezing ${mnt}" >&2
+ fsfreeze -u "${mnt}"
+ ;;
+ *)
+ echo "unknown command ${cmd}" >&2
+ exit 1
+ ;;
+ esac
+done
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 23:14:55 +0000