--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "include/compat.h"
+#include "tools/rbd/ArgumentTypes.h"
+#include "tools/rbd/Shell.h"
+#include "tools/rbd/Utils.h"
+#include "include/Context.h"
+#include "common/errno.h"
+#include "common/Throttle.h"
+#include "include/encoding.h"
+#include <iostream>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <boost/program_options.hpp>
+#include <boost/scope_exit.hpp>
+
+namespace rbd {
+namespace action {
+namespace export_full {
+
+struct ExportDiffContext {
+ librbd::Image *image;
+ int fd;
+ int export_format;
+ uint64_t totalsize;
+ utils::ProgressContext pc;
+ OrderedThrottle throttle;
+
+ ExportDiffContext(librbd::Image *i, int f, uint64_t t, int max_ops,
+ bool no_progress, int eformat) :
+ image(i), fd(f), export_format(eformat), totalsize(t), pc("Exporting image", no_progress),
+ throttle(max_ops, true) {
+ }
+};
+
+class C_ExportDiff : public Context {
+public:
+ C_ExportDiff(ExportDiffContext *edc, uint64_t offset, uint64_t length,
+ bool exists, int export_format)
+ : m_export_diff_context(edc), m_offset(offset), m_length(length),
+ m_exists(exists), m_export_format(export_format) {
+ }
+
+ int send() {
+ if (m_export_diff_context->throttle.pending_error()) {
+ return m_export_diff_context->throttle.wait_for_ret();
+ }
+
+ C_OrderedThrottle *ctx = m_export_diff_context->throttle.start_op(this);
+ if (m_exists) {
+ librbd::RBD::AioCompletion *aio_completion =
+ new librbd::RBD::AioCompletion(ctx, &utils::aio_context_callback);
+
+ int op_flags = LIBRADOS_OP_FLAG_FADVISE_NOCACHE;
+ int r = m_export_diff_context->image->aio_read2(
+ m_offset, m_length, m_read_data, aio_completion, op_flags);
+ if (r < 0) {
+ aio_completion->release();
+ ctx->complete(r);
+ }
+ } else {
+ ctx->complete(0);
+ }
+ return 0;
+ }
+
+ static int export_diff_cb(uint64_t offset, size_t length, int exists,
+ void *arg) {
+ ExportDiffContext *edc = reinterpret_cast<ExportDiffContext *>(arg);
+
+ C_ExportDiff *context = new C_ExportDiff(edc, offset, length, exists, edc->export_format);
+ return context->send();
+ }
+
+protected:
+ void finish(int r) override {
+ if (r >= 0) {
+ if (m_exists) {
+ m_exists = !m_read_data.is_zero();
+ }
+ r = write_extent(m_export_diff_context, m_offset, m_length, m_exists, m_export_format);
+ if (r == 0 && m_exists) {
+ r = m_read_data.write_fd(m_export_diff_context->fd);
+ }
+ }
+ m_export_diff_context->throttle.end_op(r);
+ }
+
+private:
+ ExportDiffContext *m_export_diff_context;
+ uint64_t m_offset;
+ uint64_t m_length;
+ bool m_exists;
+ int m_export_format;
+ bufferlist m_read_data;
+
+ static int write_extent(ExportDiffContext *edc, uint64_t offset,
+ uint64_t length, bool exists, int export_format) {
+ // extent
+ bufferlist bl;
+ __u8 tag = exists ? RBD_DIFF_WRITE : RBD_DIFF_ZERO;
+ uint64_t len = 0;
+ ::encode(tag, bl);
+ if (export_format == 2) {
+ if (tag == RBD_DIFF_WRITE)
+ len = 8 + 8 + length;
+ else
+ len = 8 + 8;
+ ::encode(len, bl);
+ }
+ ::encode(offset, bl);
+ ::encode(length, bl);
+ int r = bl.write_fd(edc->fd);
+
+ edc->pc.update_progress(offset, edc->totalsize);
+ return r;
+ }
+};
+
+
+int do_export_diff_fd(librbd::Image& image, const char *fromsnapname,
+ const char *endsnapname, bool whole_object,
+ int fd, bool no_progress, int export_format)
+{
+ int r;
+ librbd::image_info_t info;
+
+ r = image.stat(info, sizeof(info));
+ if (r < 0)
+ return r;
+
+ {
+ // header
+ bufferlist bl;
+ if (export_format == 1)
+ bl.append(utils::RBD_DIFF_BANNER);
+ else
+ bl.append(utils::RBD_DIFF_BANNER_V2);
+
+ __u8 tag;
+ uint64_t len = 0;
+ if (fromsnapname) {
+ tag = RBD_DIFF_FROM_SNAP;
+ ::encode(tag, bl);
+ std::string from(fromsnapname);
+ if (export_format == 2) {
+ len = from.length() + 4;
+ ::encode(len, bl);
+ }
+ ::encode(from, bl);
+ }
+
+ if (endsnapname) {
+ tag = RBD_DIFF_TO_SNAP;
+ ::encode(tag, bl);
+ std::string to(endsnapname);
+ if (export_format == 2) {
+ len = to.length() + 4;
+ ::encode(len, bl);
+ }
+ ::encode(to, bl);
+ }
+
+ tag = RBD_DIFF_IMAGE_SIZE;
+ ::encode(tag, bl);
+ uint64_t endsize = info.size;
+ if (export_format == 2) {
+ len = 8;
+ ::encode(len, bl);
+ }
+ ::encode(endsize, bl);
+
+ r = bl.write_fd(fd);
+ if (r < 0) {
+ return r;
+ }
+ }
+ ExportDiffContext edc(&image, fd, info.size,
+ g_conf->get_val<int64_t>("rbd_concurrent_management_ops"),
+ no_progress, export_format);
+ r = image.diff_iterate2(fromsnapname, 0, info.size, true, whole_object,
+ &C_ExportDiff::export_diff_cb, (void *)&edc);
+ if (r < 0) {
+ goto out;
+ }
+
+ r = edc.throttle.wait_for_ret();
+ if (r < 0) {
+ goto out;
+ }
+
+ {
+ __u8 tag = RBD_DIFF_END;
+ bufferlist bl;
+ ::encode(tag, bl);
+ r = bl.write_fd(fd);
+ }
+
+out:
+ if (r < 0)
+ edc.pc.fail();
+ else
+ edc.pc.finish();
+
+ return r;
+}
+
+int do_export_diff(librbd::Image& image, const char *fromsnapname,
+ const char *endsnapname, bool whole_object,
+ const char *path, bool no_progress)
+{
+ int r;
+ int fd;
+
+ if (strcmp(path, "-") == 0)
+ fd = STDOUT_FILENO;
+ else
+ fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0644);
+ if (fd < 0)
+ return -errno;
+
+ r = do_export_diff_fd(image, fromsnapname, endsnapname, whole_object, fd, no_progress, 1);
+
+ if (fd != 1)
+ close(fd);
+ if (r < 0 && fd != 1) {
+ remove(path);
+ }
+
+ return r;
+}
+
+
+namespace at = argument_types;
+namespace po = boost::program_options;
+
+void get_arguments_diff(po::options_description *positional,
+ po::options_description *options) {
+ at::add_image_or_snap_spec_options(positional, options,
+ at::ARGUMENT_MODIFIER_SOURCE);
+ at::add_path_options(positional, options,
+ "export file (or '-' for stdout)");
+ options->add_options()
+ (at::FROM_SNAPSHOT_NAME.c_str(), po::value<std::string>(),
+ "snapshot starting point")
+ (at::WHOLE_OBJECT.c_str(), po::bool_switch(), "compare whole object");
+ at::add_no_progress_option(options);
+}
+
+int execute_diff(const po::variables_map &vm) {
+ size_t arg_index = 0;
+ std::string pool_name;
+ std::string image_name;
+ std::string snap_name;
+ int r = utils::get_pool_image_snapshot_names(
+ vm, at::ARGUMENT_MODIFIER_SOURCE, &arg_index, &pool_name, &image_name,
+ &snap_name, utils::SNAPSHOT_PRESENCE_PERMITTED,
+ utils::SPEC_VALIDATION_NONE);
+ if (r < 0) {
+ return r;
+ }
+
+ std::string path;
+ r = utils::get_path(vm, utils::get_positional_argument(vm, 1), &path);
+ if (r < 0) {
+ return r;
+ }
+
+ std::string from_snap_name;
+ if (vm.count(at::FROM_SNAPSHOT_NAME)) {
+ from_snap_name = vm[at::FROM_SNAPSHOT_NAME].as<std::string>();
+ }
+
+ librados::Rados rados;
+ librados::IoCtx io_ctx;
+ librbd::Image image;
+ r = utils::init_and_open_image(pool_name, image_name, "", snap_name, true,
+ &rados, &io_ctx, &image);
+ if (r < 0) {
+ return r;
+ }
+
+ r = do_export_diff(image,
+ from_snap_name.empty() ? nullptr : from_snap_name.c_str(),
+ snap_name.empty() ? nullptr : snap_name.c_str(),
+ vm[at::WHOLE_OBJECT].as<bool>(), path.c_str(),
+ vm[at::NO_PROGRESS].as<bool>());
+ if (r < 0) {
+ std::cerr << "rbd: export-diff error: " << cpp_strerror(r) << std::endl;
+ return r;
+ }
+ return 0;
+}
+
+Shell::SwitchArguments switched_arguments({at::WHOLE_OBJECT});
+Shell::Action action_diff(
+ {"export-diff"}, {}, "Export incremental diff to file.", "",
+ &get_arguments_diff, &execute_diff);
+
+class C_Export : public Context
+{
+public:
+ C_Export(SimpleThrottle &simple_throttle, librbd::Image &image,
+ uint64_t fd_offset, uint64_t offset, uint64_t length, int fd)
+ : m_aio_completion(
+ new librbd::RBD::AioCompletion(this, &utils::aio_context_callback)),
+ m_throttle(simple_throttle), m_image(image), m_dest_offset(fd_offset),
+ m_offset(offset), m_length(length), m_fd(fd)
+ {
+ }
+
+ void send()
+ {
+ m_throttle.start_op();
+
+ int op_flags = LIBRADOS_OP_FLAG_FADVISE_SEQUENTIAL |
+ LIBRADOS_OP_FLAG_FADVISE_NOCACHE;
+ int r = m_image.aio_read2(m_offset, m_length, m_bufferlist,
+ m_aio_completion, op_flags);
+ if (r < 0) {
+ cerr << "rbd: error requesting read from source image" << std::endl;
+ m_aio_completion->release();
+ m_throttle.end_op(r);
+ }
+ }
+
+ void finish(int r) override
+ {
+ BOOST_SCOPE_EXIT((&m_throttle) (&r))
+ {
+ m_throttle.end_op(r);
+ } BOOST_SCOPE_EXIT_END
+
+ if (r < 0) {
+ cerr << "rbd: error reading from source image at offset "
+ << m_offset << ": " << cpp_strerror(r) << std::endl;
+ return;
+ }
+
+ assert(m_bufferlist.length() == static_cast<size_t>(r));
+ if (m_fd != STDOUT_FILENO) {
+ if (m_bufferlist.is_zero()) {
+ return;
+ }
+
+ uint64_t chkret = lseek64(m_fd, m_dest_offset, SEEK_SET);
+ if (chkret != m_dest_offset) {
+ cerr << "rbd: error seeking destination image to offset "
+ << m_dest_offset << std::endl;
+ r = -errno;
+ return;
+ }
+ }
+
+ r = m_bufferlist.write_fd(m_fd);
+ if (r < 0) {
+ cerr << "rbd: error writing to destination image at offset "
+ << m_dest_offset << std::endl;
+ }
+ }
+
+private:
+ librbd::RBD::AioCompletion *m_aio_completion;
+ SimpleThrottle &m_throttle;
+ librbd::Image &m_image;
+ bufferlist m_bufferlist;
+ uint64_t m_dest_offset;
+ uint64_t m_offset;
+ uint64_t m_length;
+ int m_fd;
+};
+
+static int do_export_v2(librbd::Image& image, librbd::image_info_t &info, int fd,
+ uint64_t period, int max_concurrent_ops, utils::ProgressContext &pc)
+{
+ int r = 0;
+ // header
+ bufferlist bl;
+ bl.append(utils::RBD_IMAGE_BANNER_V2);
+
+ __u8 tag;
+ uint64_t length;
+ // encode order
+ tag = RBD_EXPORT_IMAGE_ORDER;
+ length = 8;
+ ::encode(tag, bl);
+ ::encode(length, bl);
+ ::encode(uint64_t(info.order), bl);
+
+ // encode features
+ tag = RBD_EXPORT_IMAGE_FEATURES;
+ uint64_t features;
+ image.features(&features);
+ length = 8;
+ ::encode(tag, bl);
+ ::encode(length, bl);
+ ::encode(features, bl);
+
+ // encode stripe_unit and stripe_count
+ tag = RBD_EXPORT_IMAGE_STRIPE_UNIT;
+ uint64_t stripe_unit;
+ stripe_unit = image.get_stripe_unit();
+ length = 8;
+ ::encode(tag, bl);
+ ::encode(length, bl);
+ ::encode(stripe_unit, bl);
+
+ tag = RBD_EXPORT_IMAGE_STRIPE_COUNT;
+ uint64_t stripe_count;
+ stripe_count = image.get_stripe_count();
+ length = 8;
+ ::encode(tag, bl);
+ ::encode(length, bl);
+ ::encode(stripe_count, bl);
+
+ // encode end tag
+ tag = RBD_EXPORT_IMAGE_END;
+ ::encode(tag, bl);
+
+ // write bl to fd.
+ r = bl.write_fd(fd);
+ if (r < 0) {
+ return r;
+ }
+
+ // header for snapshots
+ bl.clear();
+ bl.append(utils::RBD_IMAGE_DIFFS_BANNER_V2);
+
+ std::vector<librbd::snap_info_t> snaps;
+ r = image.snap_list(snaps);
+ if (r < 0) {
+ return r;
+ }
+
+ uint64_t diff_num = snaps.size() + 1;
+ ::encode(diff_num, bl);
+
+ r = bl.write_fd(fd);
+ if (r < 0) {
+ return r;
+ }
+
+ const char *last_snap = NULL;
+ for (size_t i = 0; i < snaps.size(); ++i) {
+ utils::snap_set(image, snaps[i].name.c_str());
+ r = do_export_diff_fd(image, last_snap, snaps[i].name.c_str(), false, fd, true, 2);
+ if (r < 0) {
+ return r;
+ }
+ pc.update_progress(i, snaps.size() + 1);
+ last_snap = snaps[i].name.c_str();
+ }
+ utils::snap_set(image, std::string(""));
+ r = do_export_diff_fd(image, last_snap, nullptr, false, fd, true, 2);
+ if (r < 0) {
+ return r;
+ }
+ pc.update_progress(snaps.size() + 1, snaps.size() + 1);
+ return r;
+}
+
+static int do_export_v1(librbd::Image& image, librbd::image_info_t &info, int fd,
+ uint64_t period, int max_concurrent_ops, utils::ProgressContext &pc)
+{
+ int r = 0;
+ size_t file_size = 0;
+ SimpleThrottle throttle(max_concurrent_ops, false);
+ for (uint64_t offset = 0; offset < info.size; offset += period) {
+ if (throttle.pending_error()) {
+ break;
+ }
+
+ uint64_t length = min(period, info.size - offset);
+ C_Export *ctx = new C_Export(throttle, image, file_size + offset, offset, length, fd);
+ ctx->send();
+
+ pc.update_progress(offset, info.size);
+ }
+
+ file_size += info.size;
+ r = throttle.wait_for_ret();
+ if (fd != 1) {
+ if (r >= 0) {
+ r = ftruncate(fd, file_size);
+ if (r < 0)
+ return r;
+
+ uint64_t chkret = lseek64(fd, file_size, SEEK_SET);
+ if (chkret != file_size)
+ r = errno;
+ }
+ }
+ return r;
+}
+
+static int do_export(librbd::Image& image, const char *path, bool no_progress, int export_format)
+{
+ librbd::image_info_t info;
+ int64_t r = image.stat(info, sizeof(info));
+ if (r < 0)
+ return r;
+
+ int fd;
+ int max_concurrent_ops;
+ bool to_stdout = (strcmp(path, "-") == 0);
+ if (to_stdout) {
+ fd = STDOUT_FILENO;
+ max_concurrent_ops = 1;
+ } else {
+ max_concurrent_ops = g_conf->get_val<int64_t>("rbd_concurrent_management_ops");
+ fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0644);
+ if (fd < 0) {
+ return -errno;
+ }
+#ifdef HAVE_POSIX_FADVISE
+ posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL);
+#endif
+ }
+
+ utils::ProgressContext pc("Exporting image", no_progress);
+ uint64_t period = image.get_stripe_count() * (1ull << info.order);
+
+ if (export_format == 1)
+ r = do_export_v1(image, info, fd, period, max_concurrent_ops, pc);
+ else
+ r = do_export_v2(image, info, fd, period, max_concurrent_ops, pc);
+
+ if (r < 0)
+ pc.fail();
+ else
+ pc.finish();
+ if (!to_stdout)
+ close(fd);
+ return r;
+}
+
+void get_arguments(po::options_description *positional,
+ po::options_description *options) {
+ at::add_image_or_snap_spec_options(positional, options,
+ at::ARGUMENT_MODIFIER_SOURCE);
+ at::add_path_options(positional, options,
+ "export file (or '-' for stdout)");
+ at::add_no_progress_option(options);
+ at::add_export_format_option(options);
+}
+
+int execute(const po::variables_map &vm) {
+ size_t arg_index = 0;
+ std::string pool_name;
+ std::string image_name;
+ std::string snap_name;
+ int r = utils::get_pool_image_snapshot_names(
+ vm, at::ARGUMENT_MODIFIER_SOURCE, &arg_index, &pool_name, &image_name,
+ &snap_name, utils::SNAPSHOT_PRESENCE_PERMITTED,
+ utils::SPEC_VALIDATION_NONE);
+ if (r < 0) {
+ return r;
+ }
+
+ std::string path;
+ r = utils::get_path(vm, utils::get_positional_argument(vm, 1), &path);
+ if (r < 0) {
+ return r;
+ }
+
+ librados::Rados rados;
+ librados::IoCtx io_ctx;
+ librbd::Image image;
+ r = utils::init_and_open_image(pool_name, image_name, "", snap_name, true,
+ &rados, &io_ctx, &image);
+ if (r < 0) {
+ return r;
+ }
+
+ int format = 1;
+ if (vm.count("export-format"))
+ format = vm["export-format"].as<uint64_t>();
+
+ r = do_export(image, path.c_str(), vm[at::NO_PROGRESS].as<bool>(), format);
+ if (r < 0) {
+ std::cerr << "rbd: export error: " << cpp_strerror(r) << std::endl;
+ return r;
+ }
+ return 0;
+}
+
+Shell::Action action(
+ {"export"}, {}, "Export image to file.", "", &get_arguments, &execute);
+
+} // namespace export_full
+} // namespace action
+} // namespace rbd
Code Review / stor4nfv.git / blobdiff