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-rw-r--r--src/librbd/ImageCtx.cc965
1 files changed, 965 insertions, 0 deletions
diff --git a/src/librbd/ImageCtx.cc b/src/librbd/ImageCtx.cc
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index 000000000..058352949
--- /dev/null
+++ b/src/librbd/ImageCtx.cc
@@ -0,0 +1,965 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+#include <errno.h>
+#include <boost/assign/list_of.hpp>
+#include <stddef.h>
+
+#include "include/neorados/RADOS.hpp"
+
+#include "common/ceph_context.h"
+#include "common/dout.h"
+#include "common/errno.h"
+#include "common/perf_counters.h"
+#include "common/Timer.h"
+
+#include "librbd/AsioEngine.h"
+#include "librbd/AsyncRequest.h"
+#include "librbd/ExclusiveLock.h"
+#include "librbd/internal.h"
+#include "librbd/ImageCtx.h"
+#include "librbd/ImageState.h"
+#include "librbd/ImageWatcher.h"
+#include "librbd/Journal.h"
+#include "librbd/LibrbdAdminSocketHook.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/Operations.h"
+#include "librbd/PluginRegistry.h"
+#include "librbd/Types.h"
+#include "librbd/Utils.h"
+#include "librbd/asio/ContextWQ.h"
+#include "librbd/exclusive_lock/AutomaticPolicy.h"
+#include "librbd/exclusive_lock/StandardPolicy.h"
+#include "librbd/io/AioCompletion.h"
+#include "librbd/io/AsyncOperation.h"
+#include "librbd/io/ImageDispatcher.h"
+#include "librbd/io/ObjectDispatcher.h"
+#include "librbd/io/QosImageDispatch.h"
+#include "librbd/journal/StandardPolicy.h"
+#include "librbd/operation/ResizeRequest.h"
+
+#include "osdc/Striper.h"
+#include <boost/algorithm/string/predicate.hpp>
+
+#define dout_subsys ceph_subsys_rbd
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::ImageCtx: "
+
+using std::map;
+using std::pair;
+using std::set;
+using std::string;
+using std::vector;
+
+using ceph::bufferlist;
+using librados::snap_t;
+using librados::IoCtx;
+
+namespace librbd {
+
+namespace {
+
+class SafeTimerSingleton : public CommonSafeTimer<ceph::mutex> {
+public:
+ ceph::mutex lock = ceph::make_mutex("librbd::SafeTimerSingleton::lock");
+
+ explicit SafeTimerSingleton(CephContext *cct)
+ : SafeTimer(cct, lock, true) {
+ init();
+ }
+ ~SafeTimerSingleton() {
+ std::lock_guard locker{lock};
+ shutdown();
+ }
+};
+
+librados::IoCtx duplicate_io_ctx(librados::IoCtx& io_ctx) {
+ librados::IoCtx dup_io_ctx;
+ dup_io_ctx.dup(io_ctx);
+ return dup_io_ctx;
+}
+
+} // anonymous namespace
+
+ const string ImageCtx::METADATA_CONF_PREFIX = "conf_";
+
+ ImageCtx::ImageCtx(const string &image_name, const string &image_id,
+ const char *snap, IoCtx& p, bool ro)
+ : cct((CephContext*)p.cct()),
+ config(cct->_conf),
+ perfcounter(NULL),
+ snap_id(CEPH_NOSNAP),
+ snap_exists(true),
+ read_only(ro),
+ read_only_flags(ro ? IMAGE_READ_ONLY_FLAG_USER : 0U),
+ exclusive_locked(false),
+ name(image_name),
+ asio_engine(std::make_shared<AsioEngine>(p)),
+ rados_api(asio_engine->get_rados_api()),
+ data_ctx(duplicate_io_ctx(p)),
+ md_ctx(duplicate_io_ctx(p)),
+ image_watcher(NULL),
+ journal(NULL),
+ owner_lock(ceph::make_shared_mutex(util::unique_lock_name("librbd::ImageCtx::owner_lock", this))),
+ image_lock(ceph::make_shared_mutex(util::unique_lock_name("librbd::ImageCtx::image_lock", this))),
+ timestamp_lock(ceph::make_shared_mutex(util::unique_lock_name("librbd::ImageCtx::timestamp_lock", this))),
+ async_ops_lock(ceph::make_mutex(util::unique_lock_name("librbd::ImageCtx::async_ops_lock", this))),
+ copyup_list_lock(ceph::make_mutex(util::unique_lock_name("librbd::ImageCtx::copyup_list_lock", this))),
+ extra_read_flags(0),
+ old_format(false),
+ order(0), size(0), features(0),
+ format_string(NULL),
+ id(image_id), parent(NULL),
+ stripe_unit(0), stripe_count(0), flags(0),
+ readahead(),
+ total_bytes_read(0),
+ state(new ImageState<>(this)),
+ operations(new Operations<>(*this)),
+ exclusive_lock(nullptr), object_map(nullptr),
+ op_work_queue(asio_engine->get_work_queue()),
+ plugin_registry(new PluginRegistry<ImageCtx>(this)),
+ event_socket_completions(32),
+ asok_hook(nullptr),
+ trace_endpoint("librbd")
+ {
+ ldout(cct, 10) << this << " " << __func__ << ": "
+ << "image_name=" << image_name << ", "
+ << "image_id=" << image_id << dendl;
+
+ if (snap)
+ snap_name = snap;
+
+ rebuild_data_io_context();
+
+ // FIPS zeroization audit 20191117: this memset is not security related.
+ memset(&header, 0, sizeof(header));
+
+ io_image_dispatcher = new io::ImageDispatcher<ImageCtx>(this);
+ io_object_dispatcher = new io::ObjectDispatcher<ImageCtx>(this);
+
+ if (cct->_conf.get_val<bool>("rbd_auto_exclusive_lock_until_manual_request")) {
+ exclusive_lock_policy = new exclusive_lock::AutomaticPolicy(this);
+ } else {
+ exclusive_lock_policy = new exclusive_lock::StandardPolicy(this);
+ }
+ journal_policy = new journal::StandardPolicy(this);
+ }
+
+ ImageCtx::ImageCtx(const string &image_name, const string &image_id,
+ uint64_t snap_id, IoCtx& p, bool ro)
+ : ImageCtx(image_name, image_id, "", p, ro) {
+ open_snap_id = snap_id;
+ }
+
+ ImageCtx::~ImageCtx() {
+ ldout(cct, 10) << this << " " << __func__ << dendl;
+
+ ceph_assert(config_watcher == nullptr);
+ ceph_assert(image_watcher == NULL);
+ ceph_assert(exclusive_lock == NULL);
+ ceph_assert(object_map == NULL);
+ ceph_assert(journal == NULL);
+ ceph_assert(asok_hook == NULL);
+
+ if (perfcounter) {
+ perf_stop();
+ }
+ delete[] format_string;
+
+ md_ctx.aio_flush();
+ if (data_ctx.is_valid()) {
+ data_ctx.aio_flush();
+ }
+
+ delete io_object_dispatcher;
+ delete io_image_dispatcher;
+
+ delete journal_policy;
+ delete exclusive_lock_policy;
+ delete operations;
+ delete state;
+
+ delete plugin_registry;
+ }
+
+ void ImageCtx::init() {
+ ceph_assert(!header_oid.empty());
+ ceph_assert(old_format || !id.empty());
+
+ asok_hook = new LibrbdAdminSocketHook(this);
+
+ string pname = string("librbd-") + id + string("-") +
+ md_ctx.get_pool_name() + string("-") + name;
+ if (!snap_name.empty()) {
+ pname += "-";
+ pname += snap_name;
+ }
+
+ trace_endpoint.copy_name(pname);
+ perf_start(pname);
+
+ ceph_assert(image_watcher == NULL);
+ image_watcher = new ImageWatcher<>(*this);
+ }
+
+ void ImageCtx::shutdown() {
+ delete image_watcher;
+ image_watcher = nullptr;
+
+ delete asok_hook;
+ asok_hook = nullptr;
+ }
+
+ void ImageCtx::init_layout(int64_t pool_id)
+ {
+ if (stripe_unit == 0 || stripe_count == 0) {
+ stripe_unit = 1ull << order;
+ stripe_count = 1;
+ }
+
+ vector<uint64_t> alignments;
+ alignments.push_back(stripe_count << order); // object set (in file striping terminology)
+ alignments.push_back(stripe_unit * stripe_count); // stripe
+ alignments.push_back(stripe_unit); // stripe unit
+ readahead.set_alignments(alignments);
+
+ layout = file_layout_t();
+ layout.stripe_unit = stripe_unit;
+ layout.stripe_count = stripe_count;
+ layout.object_size = 1ull << order;
+ layout.pool_id = pool_id; // FIXME: pool id overflow?
+
+ delete[] format_string;
+ size_t len = object_prefix.length() + 16;
+ format_string = new char[len];
+ if (old_format) {
+ snprintf(format_string, len, "%s.%%012llx", object_prefix.c_str());
+ } else {
+ snprintf(format_string, len, "%s.%%016llx", object_prefix.c_str());
+ }
+
+ ldout(cct, 10) << "init_layout stripe_unit " << stripe_unit
+ << " stripe_count " << stripe_count
+ << " object_size " << layout.object_size
+ << " prefix " << object_prefix
+ << " format " << format_string
+ << dendl;
+ }
+
+ void ImageCtx::perf_start(string name) {
+ auto perf_prio = PerfCountersBuilder::PRIO_DEBUGONLY;
+ if (child == nullptr) {
+ // ensure top-level IO stats are exported for librbd daemons
+ perf_prio = PerfCountersBuilder::PRIO_USEFUL;
+ }
+
+ PerfCountersBuilder plb(cct, name, l_librbd_first, l_librbd_last);
+
+ plb.add_u64_counter(l_librbd_rd, "rd", "Reads", "r", perf_prio);
+ plb.add_u64_counter(l_librbd_rd_bytes, "rd_bytes", "Data size in reads",
+ "rb", perf_prio, unit_t(UNIT_BYTES));
+ plb.add_time_avg(l_librbd_rd_latency, "rd_latency", "Latency of reads",
+ "rl", perf_prio);
+ plb.add_u64_counter(l_librbd_wr, "wr", "Writes", "w", perf_prio);
+ plb.add_u64_counter(l_librbd_wr_bytes, "wr_bytes", "Written data",
+ "wb", perf_prio, unit_t(UNIT_BYTES));
+ plb.add_time_avg(l_librbd_wr_latency, "wr_latency", "Write latency",
+ "wl", perf_prio);
+ plb.add_u64_counter(l_librbd_discard, "discard", "Discards");
+ plb.add_u64_counter(l_librbd_discard_bytes, "discard_bytes", "Discarded data", NULL, 0, unit_t(UNIT_BYTES));
+ plb.add_time_avg(l_librbd_discard_latency, "discard_latency", "Discard latency");
+ plb.add_u64_counter(l_librbd_flush, "flush", "Flushes");
+ plb.add_time_avg(l_librbd_flush_latency, "flush_latency", "Latency of flushes");
+ plb.add_u64_counter(l_librbd_ws, "ws", "WriteSames");
+ plb.add_u64_counter(l_librbd_ws_bytes, "ws_bytes", "WriteSame data", NULL, 0, unit_t(UNIT_BYTES));
+ plb.add_time_avg(l_librbd_ws_latency, "ws_latency", "WriteSame latency");
+ plb.add_u64_counter(l_librbd_cmp, "cmp", "CompareAndWrites");
+ plb.add_u64_counter(l_librbd_cmp_bytes, "cmp_bytes", "Data size in cmps", NULL, 0, unit_t(UNIT_BYTES));
+ plb.add_time_avg(l_librbd_cmp_latency, "cmp_latency", "Latency of cmps");
+ plb.add_u64_counter(l_librbd_snap_create, "snap_create", "Snap creations");
+ plb.add_u64_counter(l_librbd_snap_remove, "snap_remove", "Snap removals");
+ plb.add_u64_counter(l_librbd_snap_rollback, "snap_rollback", "Snap rollbacks");
+ plb.add_u64_counter(l_librbd_snap_rename, "snap_rename", "Snap rename");
+ plb.add_u64_counter(l_librbd_notify, "notify", "Updated header notifications");
+ plb.add_u64_counter(l_librbd_resize, "resize", "Resizes");
+ plb.add_u64_counter(l_librbd_readahead, "readahead", "Read ahead");
+ plb.add_u64_counter(l_librbd_readahead_bytes, "readahead_bytes", "Data size in read ahead", NULL, 0, unit_t(UNIT_BYTES));
+ plb.add_u64_counter(l_librbd_invalidate_cache, "invalidate_cache", "Cache invalidates");
+
+ plb.add_time(l_librbd_opened_time, "opened_time", "Opened time",
+ "ots", perf_prio);
+ plb.add_time(l_librbd_lock_acquired_time, "lock_acquired_time",
+ "Lock acquired time", "lats", perf_prio);
+
+ perfcounter = plb.create_perf_counters();
+ cct->get_perfcounters_collection()->add(perfcounter);
+
+ perfcounter->tset(l_librbd_opened_time, ceph_clock_now());
+ }
+
+ void ImageCtx::perf_stop() {
+ ceph_assert(perfcounter);
+ cct->get_perfcounters_collection()->remove(perfcounter);
+ delete perfcounter;
+ }
+
+ void ImageCtx::set_read_flag(unsigned flag) {
+ extra_read_flags |= flag;
+ }
+
+ int ImageCtx::get_read_flags(snap_t snap_id) {
+ int flags = librados::OPERATION_NOFLAG | read_flags;
+ if (flags != 0)
+ return flags;
+
+ flags = librados::OPERATION_NOFLAG | extra_read_flags;
+ if (snap_id == LIBRADOS_SNAP_HEAD)
+ return flags;
+
+ if (config.get_val<bool>("rbd_balance_snap_reads"))
+ flags |= librados::OPERATION_BALANCE_READS;
+ else if (config.get_val<bool>("rbd_localize_snap_reads"))
+ flags |= librados::OPERATION_LOCALIZE_READS;
+ return flags;
+ }
+
+ int ImageCtx::snap_set(uint64_t in_snap_id) {
+ ceph_assert(ceph_mutex_is_wlocked(image_lock));
+ auto it = snap_info.find(in_snap_id);
+ if (in_snap_id != CEPH_NOSNAP && it != snap_info.end()) {
+ snap_id = in_snap_id;
+ snap_namespace = it->second.snap_namespace;
+ snap_name = it->second.name;
+ snap_exists = true;
+ if (data_ctx.is_valid()) {
+ data_ctx.snap_set_read(snap_id);
+ rebuild_data_io_context();
+ }
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ void ImageCtx::snap_unset()
+ {
+ ceph_assert(ceph_mutex_is_wlocked(image_lock));
+ snap_id = CEPH_NOSNAP;
+ snap_namespace = {};
+ snap_name = "";
+ snap_exists = true;
+ if (data_ctx.is_valid()) {
+ data_ctx.snap_set_read(snap_id);
+ rebuild_data_io_context();
+ }
+ }
+
+ snap_t ImageCtx::get_snap_id(const cls::rbd::SnapshotNamespace& in_snap_namespace,
+ const string& in_snap_name) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ auto it = snap_ids.find({in_snap_namespace, in_snap_name});
+ if (it != snap_ids.end()) {
+ return it->second;
+ }
+ return CEPH_NOSNAP;
+ }
+
+ const SnapInfo* ImageCtx::get_snap_info(snap_t in_snap_id) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ map<snap_t, SnapInfo>::const_iterator it =
+ snap_info.find(in_snap_id);
+ if (it != snap_info.end())
+ return &it->second;
+ return nullptr;
+ }
+
+ int ImageCtx::get_snap_name(snap_t in_snap_id,
+ string *out_snap_name) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info) {
+ *out_snap_name = info->name;
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ int ImageCtx::get_snap_namespace(snap_t in_snap_id,
+ cls::rbd::SnapshotNamespace *out_snap_namespace) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info) {
+ *out_snap_namespace = info->snap_namespace;
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ int ImageCtx::get_parent_spec(snap_t in_snap_id,
+ cls::rbd::ParentImageSpec *out_pspec) const
+ {
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info) {
+ *out_pspec = info->parent.spec;
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ uint64_t ImageCtx::get_current_size() const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ return size;
+ }
+
+ uint64_t ImageCtx::get_object_size() const
+ {
+ return 1ull << order;
+ }
+
+ string ImageCtx::get_object_name(uint64_t num) const {
+ return util::data_object_name(this, num);
+ }
+
+ uint64_t ImageCtx::get_stripe_unit() const
+ {
+ return stripe_unit;
+ }
+
+ uint64_t ImageCtx::get_stripe_count() const
+ {
+ return stripe_count;
+ }
+
+ uint64_t ImageCtx::get_stripe_period() const
+ {
+ return stripe_count * (1ull << order);
+ }
+
+ utime_t ImageCtx::get_create_timestamp() const
+ {
+ return create_timestamp;
+ }
+
+ utime_t ImageCtx::get_access_timestamp() const
+ {
+ return access_timestamp;
+ }
+
+ utime_t ImageCtx::get_modify_timestamp() const
+ {
+ return modify_timestamp;
+ }
+
+ void ImageCtx::set_access_timestamp(utime_t at)
+ {
+ ceph_assert(ceph_mutex_is_wlocked(timestamp_lock));
+ access_timestamp = at;
+ }
+
+ void ImageCtx::set_modify_timestamp(utime_t mt)
+ {
+ ceph_assert(ceph_mutex_is_locked(timestamp_lock));
+ modify_timestamp = mt;
+ }
+
+ int ImageCtx::is_snap_protected(snap_t in_snap_id,
+ bool *is_protected) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info) {
+ *is_protected =
+ (info->protection_status == RBD_PROTECTION_STATUS_PROTECTED);
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ int ImageCtx::is_snap_unprotected(snap_t in_snap_id,
+ bool *is_unprotected) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info) {
+ *is_unprotected =
+ (info->protection_status == RBD_PROTECTION_STATUS_UNPROTECTED);
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ void ImageCtx::add_snap(cls::rbd::SnapshotNamespace in_snap_namespace,
+ string in_snap_name,
+ snap_t id, uint64_t in_size,
+ const ParentImageInfo &parent,
+ uint8_t protection_status, uint64_t flags,
+ utime_t timestamp)
+ {
+ ceph_assert(ceph_mutex_is_wlocked(image_lock));
+ snaps.push_back(id);
+ SnapInfo info(in_snap_name, in_snap_namespace,
+ in_size, parent, protection_status, flags, timestamp);
+ snap_info.insert({id, info});
+ snap_ids.insert({{in_snap_namespace, in_snap_name}, id});
+ }
+
+ void ImageCtx::rm_snap(cls::rbd::SnapshotNamespace in_snap_namespace,
+ string in_snap_name,
+ snap_t id)
+ {
+ ceph_assert(ceph_mutex_is_wlocked(image_lock));
+ snaps.erase(std::remove(snaps.begin(), snaps.end(), id), snaps.end());
+ snap_info.erase(id);
+ snap_ids.erase({in_snap_namespace, in_snap_name});
+ }
+
+ uint64_t ImageCtx::get_image_size(snap_t in_snap_id) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ if (in_snap_id == CEPH_NOSNAP) {
+ if (!resize_reqs.empty() &&
+ resize_reqs.front()->shrinking()) {
+ return resize_reqs.front()->get_image_size();
+ }
+ return size;
+ }
+
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info) {
+ return info->size;
+ }
+ return 0;
+ }
+
+ uint64_t ImageCtx::get_effective_image_size(snap_t in_snap_id) const {
+ auto raw_size = get_image_size(in_snap_id);
+ if (raw_size == 0) {
+ return 0;
+ }
+
+ io::Extents extents = {{raw_size, 0}};
+ io_image_dispatcher->remap_extents(
+ extents, io::IMAGE_EXTENTS_MAP_TYPE_PHYSICAL_TO_LOGICAL);
+ return extents.front().first;
+ }
+
+ uint64_t ImageCtx::get_object_count(snap_t in_snap_id) const {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ uint64_t image_size = get_image_size(in_snap_id);
+ return Striper::get_num_objects(layout, image_size);
+ }
+
+ bool ImageCtx::test_features(uint64_t features) const
+ {
+ std::shared_lock l{image_lock};
+ return test_features(features, image_lock);
+ }
+
+ bool ImageCtx::test_features(uint64_t in_features,
+ const ceph::shared_mutex &in_image_lock) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ return ((features & in_features) == in_features);
+ }
+
+ bool ImageCtx::test_op_features(uint64_t in_op_features) const
+ {
+ std::shared_lock l{image_lock};
+ return test_op_features(in_op_features, image_lock);
+ }
+
+ bool ImageCtx::test_op_features(uint64_t in_op_features,
+ const ceph::shared_mutex &in_image_lock) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ return ((op_features & in_op_features) == in_op_features);
+ }
+
+ int ImageCtx::get_flags(librados::snap_t _snap_id, uint64_t *_flags) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ if (_snap_id == CEPH_NOSNAP) {
+ *_flags = flags;
+ return 0;
+ }
+ const SnapInfo *info = get_snap_info(_snap_id);
+ if (info) {
+ *_flags = info->flags;
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ int ImageCtx::test_flags(librados::snap_t in_snap_id,
+ uint64_t flags, bool *flags_set) const
+ {
+ std::shared_lock l{image_lock};
+ return test_flags(in_snap_id, flags, image_lock, flags_set);
+ }
+
+ int ImageCtx::test_flags(librados::snap_t in_snap_id,
+ uint64_t flags,
+ const ceph::shared_mutex &in_image_lock,
+ bool *flags_set) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ uint64_t snap_flags;
+ int r = get_flags(in_snap_id, &snap_flags);
+ if (r < 0) {
+ return r;
+ }
+ *flags_set = ((snap_flags & flags) == flags);
+ return 0;
+ }
+
+ int ImageCtx::update_flags(snap_t in_snap_id, uint64_t flag, bool enabled)
+ {
+ ceph_assert(ceph_mutex_is_wlocked(image_lock));
+ uint64_t *_flags;
+ if (in_snap_id == CEPH_NOSNAP) {
+ _flags = &flags;
+ } else {
+ map<snap_t, SnapInfo>::iterator it = snap_info.find(in_snap_id);
+ if (it == snap_info.end()) {
+ return -ENOENT;
+ }
+ _flags = &it->second.flags;
+ }
+
+ if (enabled) {
+ (*_flags) |= flag;
+ } else {
+ (*_flags) &= ~flag;
+ }
+ return 0;
+ }
+
+ const ParentImageInfo* ImageCtx::get_parent_info(snap_t in_snap_id) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ if (in_snap_id == CEPH_NOSNAP)
+ return &parent_md;
+ const SnapInfo *info = get_snap_info(in_snap_id);
+ if (info)
+ return &info->parent;
+ return NULL;
+ }
+
+ int64_t ImageCtx::get_parent_pool_id(snap_t in_snap_id) const
+ {
+ const auto info = get_parent_info(in_snap_id);
+ if (info)
+ return info->spec.pool_id;
+ return -1;
+ }
+
+ string ImageCtx::get_parent_image_id(snap_t in_snap_id) const
+ {
+ const auto info = get_parent_info(in_snap_id);
+ if (info)
+ return info->spec.image_id;
+ return "";
+ }
+
+ uint64_t ImageCtx::get_parent_snap_id(snap_t in_snap_id) const
+ {
+ const auto info = get_parent_info(in_snap_id);
+ if (info)
+ return info->spec.snap_id;
+ return CEPH_NOSNAP;
+ }
+
+ int ImageCtx::get_parent_overlap(snap_t in_snap_id, uint64_t *overlap) const
+ {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ const auto info = get_parent_info(in_snap_id);
+ if (info) {
+ *overlap = info->overlap;
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ void ImageCtx::register_watch(Context *on_finish) {
+ ceph_assert(image_watcher != NULL);
+ image_watcher->register_watch(on_finish);
+ }
+
+ uint64_t ImageCtx::prune_parent_extents(vector<pair<uint64_t,uint64_t> >& objectx,
+ uint64_t overlap)
+ {
+ // drop extents completely beyond the overlap
+ while (!objectx.empty() && objectx.back().first >= overlap)
+ objectx.pop_back();
+
+ // trim final overlapping extent
+ if (!objectx.empty() && objectx.back().first + objectx.back().second > overlap)
+ objectx.back().second = overlap - objectx.back().first;
+
+ uint64_t len = 0;
+ for (vector<pair<uint64_t,uint64_t> >::iterator p = objectx.begin();
+ p != objectx.end();
+ ++p)
+ len += p->second;
+ ldout(cct, 10) << "prune_parent_extents image overlap " << overlap
+ << ", object overlap " << len
+ << " from image extents " << objectx << dendl;
+ return len;
+ }
+
+ void ImageCtx::cancel_async_requests() {
+ C_SaferCond ctx;
+ cancel_async_requests(&ctx);
+ ctx.wait();
+ }
+
+ void ImageCtx::cancel_async_requests(Context *on_finish) {
+ {
+ std::lock_guard async_ops_locker{async_ops_lock};
+ if (!async_requests.empty()) {
+ ldout(cct, 10) << "canceling async requests: count="
+ << async_requests.size() << dendl;
+ for (auto req : async_requests) {
+ ldout(cct, 10) << "canceling async request: " << req << dendl;
+ req->cancel();
+ }
+ async_requests_waiters.push_back(on_finish);
+ return;
+ }
+ }
+
+ on_finish->complete(0);
+ }
+
+ void ImageCtx::apply_metadata(const std::map<std::string, bufferlist> &meta,
+ bool thread_safe) {
+ ldout(cct, 20) << __func__ << dendl;
+
+ std::unique_lock image_locker(image_lock);
+
+ // reset settings back to global defaults
+ config_overrides.clear();
+ config.set_config_values(cct->_conf.get_config_values());
+
+ // extract config overrides
+ for (auto meta_pair : meta) {
+ if (!boost::starts_with(meta_pair.first, METADATA_CONF_PREFIX)) {
+ continue;
+ }
+
+ std::string key = meta_pair.first.substr(METADATA_CONF_PREFIX.size());
+ if (!boost::starts_with(key, "rbd_")) {
+ // ignore non-RBD configuration keys
+ // TODO use option schema to determine applicable subsystem
+ ldout(cct, 0) << __func__ << ": ignoring config " << key << dendl;
+ continue;
+ }
+
+ if (config.find_option(key) != nullptr) {
+ std::string val(meta_pair.second.c_str(), meta_pair.second.length());
+ int r = config.set_val(key, val);
+ if (r >= 0) {
+ ldout(cct, 20) << __func__ << ": " << key << "=" << val << dendl;
+ config_overrides.insert(key);
+ } else {
+ lderr(cct) << __func__ << ": failed to set config " << key << " "
+ << "with value " << val << ": " << cpp_strerror(r)
+ << dendl;
+ }
+ }
+ }
+
+ image_locker.unlock();
+
+#define ASSIGN_OPTION(param, type) \
+ param = config.get_val<type>("rbd_"#param)
+
+ bool skip_partial_discard = true;
+ ASSIGN_OPTION(non_blocking_aio, bool);
+ ASSIGN_OPTION(cache, bool);
+ ASSIGN_OPTION(sparse_read_threshold_bytes, Option::size_t);
+ ASSIGN_OPTION(clone_copy_on_read, bool);
+ ASSIGN_OPTION(enable_alloc_hint, bool);
+ ASSIGN_OPTION(mirroring_replay_delay, uint64_t);
+ ASSIGN_OPTION(mtime_update_interval, uint64_t);
+ ASSIGN_OPTION(atime_update_interval, uint64_t);
+ ASSIGN_OPTION(skip_partial_discard, bool);
+ ASSIGN_OPTION(discard_granularity_bytes, uint64_t);
+ ASSIGN_OPTION(blkin_trace_all, bool);
+
+ auto cache_policy = config.get_val<std::string>("rbd_cache_policy");
+ if (cache_policy == "writethrough" || cache_policy == "writeback") {
+ ASSIGN_OPTION(readahead_max_bytes, Option::size_t);
+ ASSIGN_OPTION(readahead_disable_after_bytes, Option::size_t);
+ }
+
+#undef ASSIGN_OPTION
+
+ if (sparse_read_threshold_bytes == 0) {
+ sparse_read_threshold_bytes = get_object_size();
+ }
+
+ bool dirty_cache = test_features(RBD_FEATURE_DIRTY_CACHE);
+ if (!skip_partial_discard || dirty_cache) {
+ discard_granularity_bytes = 0;
+ }
+
+ alloc_hint_flags = 0;
+ auto compression_hint = config.get_val<std::string>("rbd_compression_hint");
+ if (compression_hint == "compressible") {
+ alloc_hint_flags |= librados::ALLOC_HINT_FLAG_COMPRESSIBLE;
+ } else if (compression_hint == "incompressible") {
+ alloc_hint_flags |= librados::ALLOC_HINT_FLAG_INCOMPRESSIBLE;
+ }
+
+ librados::Rados rados(md_ctx);
+ int8_t require_osd_release;
+ int r = rados.get_min_compatible_osd(&require_osd_release);
+ if (r == 0 && require_osd_release >= CEPH_RELEASE_OCTOPUS) {
+ read_flags = 0;
+ auto read_policy = config.get_val<std::string>("rbd_read_from_replica_policy");
+ if (read_policy == "balance") {
+ read_flags |= librados::OPERATION_BALANCE_READS;
+ } else if (read_policy == "localize") {
+ read_flags |= librados::OPERATION_LOCALIZE_READS;
+ }
+ }
+
+ io_image_dispatcher->apply_qos_schedule_tick_min(
+ config.get_val<uint64_t>("rbd_qos_schedule_tick_min"));
+
+ io_image_dispatcher->apply_qos_limit(
+ io::IMAGE_DISPATCH_FLAG_QOS_IOPS_THROTTLE,
+ config.get_val<uint64_t>("rbd_qos_iops_limit"),
+ config.get_val<uint64_t>("rbd_qos_iops_burst"),
+ config.get_val<uint64_t>("rbd_qos_iops_burst_seconds"));
+ io_image_dispatcher->apply_qos_limit(
+ io::IMAGE_DISPATCH_FLAG_QOS_BPS_THROTTLE,
+ config.get_val<uint64_t>("rbd_qos_bps_limit"),
+ config.get_val<uint64_t>("rbd_qos_bps_burst"),
+ config.get_val<uint64_t>("rbd_qos_bps_burst_seconds"));
+ io_image_dispatcher->apply_qos_limit(
+ io::IMAGE_DISPATCH_FLAG_QOS_READ_IOPS_THROTTLE,
+ config.get_val<uint64_t>("rbd_qos_read_iops_limit"),
+ config.get_val<uint64_t>("rbd_qos_read_iops_burst"),
+ config.get_val<uint64_t>("rbd_qos_read_iops_burst_seconds"));
+ io_image_dispatcher->apply_qos_limit(
+ io::IMAGE_DISPATCH_FLAG_QOS_WRITE_IOPS_THROTTLE,
+ config.get_val<uint64_t>("rbd_qos_write_iops_limit"),
+ config.get_val<uint64_t>("rbd_qos_write_iops_burst"),
+ config.get_val<uint64_t>("rbd_qos_write_iops_burst_seconds"));
+ io_image_dispatcher->apply_qos_limit(
+ io::IMAGE_DISPATCH_FLAG_QOS_READ_BPS_THROTTLE,
+ config.get_val<uint64_t>("rbd_qos_read_bps_limit"),
+ config.get_val<uint64_t>("rbd_qos_read_bps_burst"),
+ config.get_val<uint64_t>("rbd_qos_read_bps_burst_seconds"));
+ io_image_dispatcher->apply_qos_limit(
+ io::IMAGE_DISPATCH_FLAG_QOS_WRITE_BPS_THROTTLE,
+ config.get_val<uint64_t>("rbd_qos_write_bps_limit"),
+ config.get_val<uint64_t>("rbd_qos_write_bps_burst"),
+ config.get_val<uint64_t>("rbd_qos_write_bps_burst_seconds"));
+
+ if (!disable_zero_copy &&
+ config.get_val<bool>("rbd_disable_zero_copy_writes")) {
+ ldout(cct, 5) << this << ": disabling zero-copy writes" << dendl;
+ disable_zero_copy = true;
+ }
+ }
+
+ ExclusiveLock<ImageCtx> *ImageCtx::create_exclusive_lock() {
+ return new ExclusiveLock<ImageCtx>(*this);
+ }
+
+ ObjectMap<ImageCtx> *ImageCtx::create_object_map(uint64_t snap_id) {
+ return new ObjectMap<ImageCtx>(*this, snap_id);
+ }
+
+ Journal<ImageCtx> *ImageCtx::create_journal() {
+ return new Journal<ImageCtx>(*this);
+ }
+
+ void ImageCtx::set_image_name(const std::string &image_name) {
+ // update the name so rename can be invoked repeatedly
+ std::shared_lock owner_locker{owner_lock};
+ std::unique_lock image_locker{image_lock};
+ name = image_name;
+ if (old_format) {
+ header_oid = util::old_header_name(image_name);
+ }
+ }
+
+ void ImageCtx::notify_update() {
+ state->handle_update_notification();
+ ImageWatcher<>::notify_header_update(md_ctx, header_oid);
+ }
+
+ void ImageCtx::notify_update(Context *on_finish) {
+ state->handle_update_notification();
+ image_watcher->notify_header_update(on_finish);
+ }
+
+ exclusive_lock::Policy *ImageCtx::get_exclusive_lock_policy() const {
+ ceph_assert(ceph_mutex_is_locked(owner_lock));
+ ceph_assert(exclusive_lock_policy != nullptr);
+ return exclusive_lock_policy;
+ }
+
+ void ImageCtx::set_exclusive_lock_policy(exclusive_lock::Policy *policy) {
+ ceph_assert(ceph_mutex_is_wlocked(owner_lock));
+ ceph_assert(policy != nullptr);
+ delete exclusive_lock_policy;
+ exclusive_lock_policy = policy;
+ }
+
+ journal::Policy *ImageCtx::get_journal_policy() const {
+ ceph_assert(ceph_mutex_is_locked(image_lock));
+ ceph_assert(journal_policy != nullptr);
+ return journal_policy;
+ }
+
+ void ImageCtx::set_journal_policy(journal::Policy *policy) {
+ ceph_assert(ceph_mutex_is_wlocked(image_lock));
+ ceph_assert(policy != nullptr);
+ delete journal_policy;
+ journal_policy = policy;
+ }
+
+ void ImageCtx::rebuild_data_io_context() {
+ auto ctx = std::make_shared<neorados::IOContext>(
+ data_ctx.get_id(), data_ctx.get_namespace());
+ if (snap_id != CEPH_NOSNAP) {
+ ctx->read_snap(snap_id);
+ }
+ if (!snapc.snaps.empty()) {
+ ctx->write_snap_context(
+ {{snapc.seq, {snapc.snaps.begin(), snapc.snaps.end()}}});
+ }
+ if (data_ctx.get_pool_full_try()) {
+ ctx->full_try(true);
+ }
+
+ // atomically reset the data IOContext to new version
+ atomic_store(&data_io_context, ctx);
+ }
+
+ IOContext ImageCtx::get_data_io_context() const {
+ return atomic_load(&data_io_context);
+ }
+
+ IOContext ImageCtx::duplicate_data_io_context() const {
+ auto ctx = get_data_io_context();
+ return std::make_shared<neorados::IOContext>(*ctx);
+ }
+
+ void ImageCtx::get_timer_instance(CephContext *cct, SafeTimer **timer,
+ ceph::mutex **timer_lock) {
+ auto safe_timer_singleton =
+ &cct->lookup_or_create_singleton_object<SafeTimerSingleton>(
+ "librbd::journal::safe_timer", false, cct);
+ *timer = safe_timer_singleton;
+ *timer_lock = &safe_timer_singleton->lock;
+ }
+}