+++ /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