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-rw-r--r--src/mds/Migrator.cc3693
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diff --git a/src/mds/Migrator.cc b/src/mds/Migrator.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * 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 "MDSRank.h"
+#include "MDCache.h"
+#include "CInode.h"
+#include "CDir.h"
+#include "CDentry.h"
+#include "Migrator.h"
+#include "Locker.h"
+#include "Server.h"
+
+#include "MDBalancer.h"
+#include "MDLog.h"
+#include "MDSMap.h"
+#include "Mutation.h"
+
+#include "include/filepath.h"
+#include "common/likely.h"
+
+#include "events/EExport.h"
+#include "events/EImportStart.h"
+#include "events/EImportFinish.h"
+#include "events/ESessions.h"
+
+#include "msg/Messenger.h"
+
+#include "messages/MClientCaps.h"
+
+/*
+ * this is what the dir->dir_auth values look like
+ *
+ * dir_auth authbits
+ * export
+ * me me - before
+ * me, me me - still me, but preparing for export
+ * me, them me - send MExportDir (peer is preparing)
+ * them, me me - journaled EExport
+ * them them - done
+ *
+ * import:
+ * them them - before
+ * me, them me - journaled EImportStart
+ * me me - done
+ *
+ * which implies:
+ * - auth bit is set if i am listed as first _or_ second dir_auth.
+ */
+
+#include "common/config.h"
+
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+#undef dout_prefix
+#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".mig " << __func__ << " "
+
+using namespace std;
+
+class MigratorContext : public MDSContext {
+protected:
+ Migrator *mig;
+ MDSRank *get_mds() override {
+ return mig->mds;
+ }
+public:
+ explicit MigratorContext(Migrator *mig_) : mig(mig_) {
+ ceph_assert(mig != NULL);
+ }
+};
+
+class MigratorLogContext : public MDSLogContextBase {
+protected:
+ Migrator *mig;
+ MDSRank *get_mds() override {
+ return mig->mds;
+ }
+public:
+ explicit MigratorLogContext(Migrator *mig_) : mig(mig_) {
+ ceph_assert(mig != NULL);
+ }
+};
+
+void Migrator::dispatch(const cref_t<Message> &m)
+{
+ switch (m->get_type()) {
+ // import
+ case MSG_MDS_EXPORTDIRDISCOVER:
+ handle_export_discover(ref_cast<MExportDirDiscover>(m));
+ break;
+ case MSG_MDS_EXPORTDIRPREP:
+ handle_export_prep(ref_cast<MExportDirPrep>(m));
+ break;
+ case MSG_MDS_EXPORTDIR:
+ if (unlikely(inject_session_race)) {
+ dout(0) << "waiting for inject_session_race" << dendl;
+ mds->wait_for_any_client_connection(new C_MDS_RetryMessage(mds, m));
+ } else {
+ handle_export_dir(ref_cast<MExportDir>(m));
+ }
+ break;
+ case MSG_MDS_EXPORTDIRFINISH:
+ handle_export_finish(ref_cast<MExportDirFinish>(m));
+ break;
+ case MSG_MDS_EXPORTDIRCANCEL:
+ handle_export_cancel(ref_cast<MExportDirCancel>(m));
+ break;
+
+ // export
+ case MSG_MDS_EXPORTDIRDISCOVERACK:
+ handle_export_discover_ack(ref_cast<MExportDirDiscoverAck>(m));
+ break;
+ case MSG_MDS_EXPORTDIRPREPACK:
+ handle_export_prep_ack(ref_cast<MExportDirPrepAck>(m));
+ break;
+ case MSG_MDS_EXPORTDIRACK:
+ handle_export_ack(ref_cast<MExportDirAck>(m));
+ break;
+ case MSG_MDS_EXPORTDIRNOTIFYACK:
+ handle_export_notify_ack(ref_cast<MExportDirNotifyAck>(m));
+ break;
+
+ // export 3rd party (dir_auth adjustments)
+ case MSG_MDS_EXPORTDIRNOTIFY:
+ handle_export_notify(ref_cast<MExportDirNotify>(m));
+ break;
+
+ // caps
+ case MSG_MDS_EXPORTCAPS:
+ handle_export_caps(ref_cast<MExportCaps>(m));
+ break;
+ case MSG_MDS_EXPORTCAPSACK:
+ handle_export_caps_ack(ref_cast<MExportCapsAck>(m));
+ break;
+ case MSG_MDS_GATHERCAPS:
+ handle_gather_caps(ref_cast<MGatherCaps>(m));
+ break;
+
+ default:
+ derr << "migrator unknown message " << m->get_type() << dendl;
+ ceph_abort_msg("migrator unknown message");
+ }
+}
+
+void Migrator::export_empty_import(CDir *dir)
+{
+ dout(7) << *dir << dendl;
+ ceph_assert(dir->is_subtree_root());
+
+ if (dir->inode->is_auth()) {
+ dout(7) << " inode is auth" << dendl;
+ return;
+ }
+ if (!dir->is_auth()) {
+ dout(7) << " not auth" << dendl;
+ return;
+ }
+ if (dir->is_freezing() || dir->is_frozen()) {
+ dout(7) << " freezing or frozen" << dendl;
+ return;
+ }
+ if (dir->get_num_head_items() > 0) {
+ dout(7) << " not actually empty" << dendl;
+ return;
+ }
+ if (dir->inode->is_root()) {
+ dout(7) << " root" << dendl;
+ return;
+ }
+
+ mds_rank_t dest = dir->inode->authority().first;
+ //if (mds->is_shutting_down()) dest = 0; // this is more efficient.
+
+ dout(7) << " really empty, exporting to " << dest << dendl;
+ assert (dest != mds->get_nodeid());
+
+ dout(7) << "exporting to mds." << dest
+ << " empty import " << *dir << dendl;
+ export_dir( dir, dest );
+}
+
+void Migrator::find_stale_export_freeze()
+{
+ utime_t now = ceph_clock_now();
+ utime_t cutoff = now;
+ cutoff -= g_conf()->mds_freeze_tree_timeout;
+
+
+ /*
+ * We could have situations like:
+ *
+ * - mds.0 authpins an item in subtree A
+ * - mds.0 sends request to mds.1 to authpin an item in subtree B
+ * - mds.0 freezes subtree A
+ * - mds.1 authpins an item in subtree B
+ * - mds.1 sends request to mds.0 to authpin an item in subtree A
+ * - mds.1 freezes subtree B
+ * - mds.1 receives the remote authpin request from mds.0
+ * (wait because subtree B is freezing)
+ * - mds.0 receives the remote authpin request from mds.1
+ * (wait because subtree A is freezing)
+ *
+ *
+ * - client request authpins items in subtree B
+ * - freeze subtree B
+ * - import subtree A which is parent of subtree B
+ * (authpins parent inode of subtree B, see CDir::set_dir_auth())
+ * - freeze subtree A
+ * - client request tries authpinning items in subtree A
+ * (wait because subtree A is freezing)
+ */
+ for (map<CDir*,export_state_t>::iterator p = export_state.begin();
+ p != export_state.end(); ) {
+ CDir* dir = p->first;
+ export_state_t& stat = p->second;
+ ++p;
+ if (stat.state != EXPORT_DISCOVERING && stat.state != EXPORT_FREEZING)
+ continue;
+ ceph_assert(dir->freeze_tree_state);
+ if (stat.last_cum_auth_pins != dir->freeze_tree_state->auth_pins) {
+ stat.last_cum_auth_pins = dir->freeze_tree_state->auth_pins;
+ stat.last_cum_auth_pins_change = now;
+ continue;
+ }
+ if (stat.last_cum_auth_pins_change >= cutoff)
+ continue;
+ if (stat.num_remote_waiters > 0 ||
+ (!dir->inode->is_root() && dir->get_parent_dir()->is_freezing())) {
+ export_try_cancel(dir);
+ }
+ }
+}
+
+void Migrator::export_try_cancel(CDir *dir, bool notify_peer)
+{
+ dout(10) << *dir << dendl;
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ ceph_assert(it != export_state.end());
+
+ int state = it->second.state;
+ switch (state) {
+ case EXPORT_LOCKING:
+ dout(10) << "export state=locking : dropping locks and removing auth_pin" << dendl;
+ num_locking_exports--;
+ it->second.state = EXPORT_CANCELLED;
+ dir->auth_unpin(this);
+ break;
+ case EXPORT_DISCOVERING:
+ dout(10) << "export state=discovering : canceling freeze and removing auth_pin" << dendl;
+ it->second.state = EXPORT_CANCELLED;
+ dir->unfreeze_tree(); // cancel the freeze
+ dir->auth_unpin(this);
+ if (notify_peer &&
+ (!mds->is_cluster_degraded() ||
+ mds->mdsmap->is_clientreplay_or_active_or_stopping(it->second.peer))) // tell them.
+ mds->send_message_mds(make_message<MExportDirCancel>(dir->dirfrag(),
+ it->second.tid),
+ it->second.peer);
+ break;
+
+ case EXPORT_FREEZING:
+ dout(10) << "export state=freezing : canceling freeze" << dendl;
+ it->second.state = EXPORT_CANCELLED;
+ dir->unfreeze_tree(); // cancel the freeze
+ if (dir->is_subtree_root())
+ mdcache->try_subtree_merge(dir);
+ if (notify_peer &&
+ (!mds->is_cluster_degraded() ||
+ mds->mdsmap->is_clientreplay_or_active_or_stopping(it->second.peer))) // tell them.
+ mds->send_message_mds(make_message<MExportDirCancel>(dir->dirfrag(),
+ it->second.tid),
+ it->second.peer);
+ break;
+
+ // NOTE: state order reversal, warning comes after prepping
+ case EXPORT_WARNING:
+ dout(10) << "export state=warning : unpinning bounds, unfreezing, notifying" << dendl;
+ it->second.state = EXPORT_CANCELLING;
+ // fall-thru
+
+ case EXPORT_PREPPING:
+ if (state != EXPORT_WARNING) {
+ dout(10) << "export state=prepping : unpinning bounds, unfreezing" << dendl;
+ it->second.state = EXPORT_CANCELLED;
+ }
+
+ {
+ // unpin bounds
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+ for (set<CDir*>::iterator q = bounds.begin();
+ q != bounds.end();
+ ++q) {
+ CDir *bd = *q;
+ bd->put(CDir::PIN_EXPORTBOUND);
+ bd->state_clear(CDir::STATE_EXPORTBOUND);
+ }
+ if (state == EXPORT_WARNING) {
+ // notify bystanders
+ export_notify_abort(dir, it->second, bounds);
+ // process delayed expires
+ mdcache->process_delayed_expire(dir);
+ }
+ }
+ dir->unfreeze_tree();
+ mdcache->try_subtree_merge(dir);
+ if (notify_peer &&
+ (!mds->is_cluster_degraded() ||
+ mds->mdsmap->is_clientreplay_or_active_or_stopping(it->second.peer))) // tell them.
+ mds->send_message_mds(make_message<MExportDirCancel>(dir->dirfrag(),
+ it->second.tid),
+ it->second.peer);
+ break;
+
+ case EXPORT_EXPORTING:
+ dout(10) << "export state=exporting : reversing, and unfreezing" << dendl;
+ it->second.state = EXPORT_CANCELLING;
+ export_reverse(dir, it->second);
+ break;
+
+ case EXPORT_LOGGINGFINISH:
+ case EXPORT_NOTIFYING:
+ dout(10) << "export state=loggingfinish|notifying : ignoring dest failure, we were successful." << dendl;
+ // leave export_state, don't clean up now.
+ break;
+ case EXPORT_CANCELLING:
+ break;
+
+ default:
+ ceph_abort();
+ }
+
+ // finish clean-up?
+ if (it->second.state == EXPORT_CANCELLING ||
+ it->second.state == EXPORT_CANCELLED) {
+ MutationRef mut;
+ mut.swap(it->second.mut);
+
+ if (it->second.state == EXPORT_CANCELLED) {
+ export_cancel_finish(it);
+ }
+
+ // drop locks
+ if (state == EXPORT_LOCKING || state == EXPORT_DISCOVERING) {
+ MDRequestRef mdr = static_cast<MDRequestImpl*>(mut.get());
+ ceph_assert(mdr);
+ mdcache->request_kill(mdr);
+ } else if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ mdcache->show_subtrees();
+
+ maybe_do_queued_export();
+ }
+}
+
+void Migrator::export_cancel_finish(export_state_iterator& it)
+{
+ CDir *dir = it->first;
+ bool unpin = (it->second.state == EXPORT_CANCELLING);
+ auto parent = std::move(it->second.parent);
+
+ total_exporting_size -= it->second.approx_size;
+ export_state.erase(it);
+
+ ceph_assert(dir->state_test(CDir::STATE_EXPORTING));
+ dir->clear_exporting();
+
+ if (unpin) {
+ // pinned by Migrator::export_notify_abort()
+ dir->auth_unpin(this);
+ }
+ // send pending import_maps? (these need to go out when all exports have finished.)
+ mdcache->maybe_send_pending_resolves();
+
+ if (parent)
+ child_export_finish(parent, false);
+}
+
+// ==========================================================
+// mds failure handling
+
+void Migrator::handle_mds_failure_or_stop(mds_rank_t who)
+{
+ dout(5) << who << dendl;
+
+ // check my exports
+
+ // first add an extra auth_pin on any freezes, so that canceling a
+ // nested freeze doesn't complete one further up the hierarchy and
+ // confuse the shit out of us. we'll remove it after canceling the
+ // freeze. this way no freeze completions run before we want them
+ // to.
+ std::vector<CDir*> pinned_dirs;
+ for (map<CDir*,export_state_t>::iterator p = export_state.begin();
+ p != export_state.end();
+ ++p) {
+ if (p->second.state == EXPORT_FREEZING) {
+ CDir *dir = p->first;
+ dout(10) << "adding temp auth_pin on freezing " << *dir << dendl;
+ dir->auth_pin(this);
+ pinned_dirs.push_back(dir);
+ }
+ }
+
+ map<CDir*,export_state_t>::iterator p = export_state.begin();
+ while (p != export_state.end()) {
+ map<CDir*,export_state_t>::iterator next = p;
+ ++next;
+ CDir *dir = p->first;
+
+ // abort exports:
+ // - that are going to the failed node
+ // - that aren't frozen yet (to avoid auth_pin deadlock)
+ // - they havne't prepped yet (they may need to discover bounds to do that)
+ if ((p->second.peer == who &&
+ p->second.state != EXPORT_CANCELLING) ||
+ p->second.state == EXPORT_LOCKING ||
+ p->second.state == EXPORT_DISCOVERING ||
+ p->second.state == EXPORT_FREEZING ||
+ p->second.state == EXPORT_PREPPING) {
+ // the guy i'm exporting to failed, or we're just freezing.
+ dout(10) << "cleaning up export state (" << p->second.state << ")"
+ << get_export_statename(p->second.state) << " of " << *dir << dendl;
+ export_try_cancel(dir);
+ } else if (p->second.peer != who) {
+ // bystander failed.
+ if (p->second.warning_ack_waiting.erase(who)) {
+ if (p->second.state == EXPORT_WARNING) {
+ p->second.notify_ack_waiting.erase(who); // they won't get a notify either.
+ // exporter waiting for warning acks, let's fake theirs.
+ dout(10) << "faking export_warning_ack from mds." << who
+ << " on " << *dir << " to mds." << p->second.peer
+ << dendl;
+ if (p->second.warning_ack_waiting.empty())
+ export_go(dir);
+ }
+ }
+ if (p->second.notify_ack_waiting.erase(who)) {
+ // exporter is waiting for notify acks, fake it
+ dout(10) << "faking export_notify_ack from mds." << who
+ << " on " << *dir << " to mds." << p->second.peer
+ << dendl;
+ if (p->second.state == EXPORT_NOTIFYING) {
+ if (p->second.notify_ack_waiting.empty())
+ export_finish(dir);
+ } else if (p->second.state == EXPORT_CANCELLING) {
+ if (p->second.notify_ack_waiting.empty()) {
+ export_cancel_finish(p);
+ }
+ }
+ }
+ }
+
+ // next!
+ p = next;
+ }
+
+
+ // check my imports
+ map<dirfrag_t,import_state_t>::iterator q = import_state.begin();
+ while (q != import_state.end()) {
+ map<dirfrag_t,import_state_t>::iterator next = q;
+ ++next;
+ dirfrag_t df = q->first;
+ CInode *diri = mdcache->get_inode(df.ino);
+ CDir *dir = mdcache->get_dirfrag(df);
+
+ if (q->second.peer == who) {
+ if (dir)
+ dout(10) << "cleaning up import state (" << q->second.state << ")"
+ << get_import_statename(q->second.state) << " of " << *dir << dendl;
+ else
+ dout(10) << "cleaning up import state (" << q->second.state << ")"
+ << get_import_statename(q->second.state) << " of " << df << dendl;
+
+ switch (q->second.state) {
+ case IMPORT_DISCOVERING:
+ dout(10) << "import state=discovering : clearing state" << dendl;
+ import_reverse_discovering(df);
+ break;
+
+ case IMPORT_DISCOVERED:
+ ceph_assert(diri);
+ dout(10) << "import state=discovered : unpinning inode " << *diri << dendl;
+ import_reverse_discovered(df, diri);
+ break;
+
+ case IMPORT_PREPPING:
+ ceph_assert(dir);
+ dout(10) << "import state=prepping : unpinning base+bounds " << *dir << dendl;
+ import_reverse_prepping(dir, q->second);
+ break;
+
+ case IMPORT_PREPPED:
+ ceph_assert(dir);
+ dout(10) << "import state=prepped : unpinning base+bounds, unfreezing " << *dir << dendl;
+ {
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+ import_remove_pins(dir, bounds);
+
+ // adjust auth back to the exporter
+ mdcache->adjust_subtree_auth(dir, q->second.peer);
+
+ // notify bystanders ; wait in aborting state
+ q->second.state = IMPORT_ABORTING;
+ import_notify_abort(dir, bounds);
+ ceph_assert(g_conf()->mds_kill_import_at != 10);
+ }
+ break;
+
+ case IMPORT_LOGGINGSTART:
+ ceph_assert(dir);
+ dout(10) << "import state=loggingstart : reversing import on " << *dir << dendl;
+ import_reverse(dir);
+ break;
+
+ case IMPORT_ACKING:
+ ceph_assert(dir);
+ // hrm. make this an ambiguous import, and wait for exporter recovery to disambiguate
+ dout(10) << "import state=acking : noting ambiguous import " << *dir << dendl;
+ {
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+ mdcache->add_ambiguous_import(dir, bounds);
+ }
+ break;
+
+ case IMPORT_FINISHING:
+ ceph_assert(dir);
+ dout(10) << "import state=finishing : finishing import on " << *dir << dendl;
+ import_finish(dir, true);
+ break;
+
+ case IMPORT_ABORTING:
+ ceph_assert(dir);
+ dout(10) << "import state=aborting : ignoring repeat failure " << *dir << dendl;
+ break;
+ }
+ } else {
+ auto bystanders_entry = q->second.bystanders.find(who);
+ if (bystanders_entry != q->second.bystanders.end()) {
+ q->second.bystanders.erase(bystanders_entry);
+ if (q->second.state == IMPORT_ABORTING) {
+ ceph_assert(dir);
+ dout(10) << "faking export_notify_ack from mds." << who
+ << " on aborting import " << *dir << " from mds." << q->second.peer
+ << dendl;
+ if (q->second.bystanders.empty())
+ import_reverse_unfreeze(dir);
+ }
+ }
+ }
+
+ // next!
+ q = next;
+ }
+
+ for (const auto& dir : pinned_dirs) {
+ dout(10) << "removing temp auth_pin on " << *dir << dendl;
+ dir->auth_unpin(this);
+ }
+}
+
+
+
+void Migrator::show_importing()
+{
+ dout(10) << dendl;
+ for (map<dirfrag_t,import_state_t>::iterator p = import_state.begin();
+ p != import_state.end();
+ ++p) {
+ CDir *dir = mdcache->get_dirfrag(p->first);
+ if (dir) {
+ dout(10) << " importing from " << p->second.peer
+ << ": (" << p->second.state << ") " << get_import_statename(p->second.state)
+ << " " << p->first << " " << *dir << dendl;
+ } else {
+ dout(10) << " importing from " << p->second.peer
+ << ": (" << p->second.state << ") " << get_import_statename(p->second.state)
+ << " " << p->first << dendl;
+ }
+ }
+}
+
+void Migrator::show_exporting()
+{
+ dout(10) << dendl;
+ for (const auto& [dir, state] : export_state) {
+ dout(10) << " exporting to " << state.peer
+ << ": (" << state.state << ") " << get_export_statename(state.state)
+ << " " << dir->dirfrag() << " " << *dir << dendl;
+ }
+}
+
+
+
+void Migrator::audit()
+{
+ if (!g_conf()->subsys.should_gather<ceph_subsys_mds, 5>())
+ return; // hrm.
+
+ // import_state
+ show_importing();
+ for (map<dirfrag_t,import_state_t>::iterator p = import_state.begin();
+ p != import_state.end();
+ ++p) {
+ if (p->second.state == IMPORT_DISCOVERING)
+ continue;
+ if (p->second.state == IMPORT_DISCOVERED) {
+ CInode *in = mdcache->get_inode(p->first.ino);
+ ceph_assert(in);
+ continue;
+ }
+ CDir *dir = mdcache->get_dirfrag(p->first);
+ ceph_assert(dir);
+ if (p->second.state == IMPORT_PREPPING)
+ continue;
+ if (p->second.state == IMPORT_ABORTING) {
+ ceph_assert(!dir->is_ambiguous_dir_auth());
+ ceph_assert(dir->get_dir_auth().first != mds->get_nodeid());
+ continue;
+ }
+ ceph_assert(dir->is_ambiguous_dir_auth());
+ ceph_assert(dir->authority().first == mds->get_nodeid() ||
+ dir->authority().second == mds->get_nodeid());
+ }
+
+ // export_state
+ show_exporting();
+ for (map<CDir*,export_state_t>::iterator p = export_state.begin();
+ p != export_state.end();
+ ++p) {
+ CDir *dir = p->first;
+ if (p->second.state == EXPORT_LOCKING ||
+ p->second.state == EXPORT_DISCOVERING ||
+ p->second.state == EXPORT_FREEZING ||
+ p->second.state == EXPORT_CANCELLING)
+ continue;
+ ceph_assert(dir->is_ambiguous_dir_auth());
+ ceph_assert(dir->authority().first == mds->get_nodeid() ||
+ dir->authority().second == mds->get_nodeid());
+ }
+
+ // ambiguous+me subtrees should be importing|exporting
+
+ // write me
+}
+
+
+
+
+
+// ==========================================================
+// EXPORT
+
+void Migrator::export_dir_nicely(CDir *dir, mds_rank_t dest)
+{
+ // enqueue
+ dout(7) << *dir << " to " << dest << dendl;
+ export_queue.push_back(pair<dirfrag_t,mds_rank_t>(dir->dirfrag(), dest));
+
+ maybe_do_queued_export();
+}
+
+void Migrator::maybe_do_queued_export()
+{
+ static bool running;
+ if (running)
+ return;
+ running = true;
+
+ uint64_t max_total_size = max_export_size * 2;
+
+ while (!export_queue.empty() &&
+ max_total_size > total_exporting_size &&
+ max_total_size - total_exporting_size >=
+ max_export_size * (num_locking_exports + 1)) {
+
+ dirfrag_t df = export_queue.front().first;
+ mds_rank_t dest = export_queue.front().second;
+ export_queue.pop_front();
+
+ CDir *dir = mdcache->get_dirfrag(df);
+ if (!dir) continue;
+ if (!dir->is_auth()) continue;
+
+ dout(7) << "nicely exporting to mds." << dest << " " << *dir << dendl;
+
+ export_dir(dir, dest);
+ }
+
+ running = false;
+}
+
+
+
+
+class C_MDC_ExportFreeze : public MigratorContext {
+ CDir *dir; // dir i'm exporting
+ uint64_t tid;
+public:
+ C_MDC_ExportFreeze(Migrator *m, CDir *e, uint64_t t) :
+ MigratorContext(m), dir(e), tid(t) {
+ dir->get(CDir::PIN_PTRWAITER);
+ }
+ void finish(int r) override {
+ if (r >= 0)
+ mig->export_frozen(dir, tid);
+ dir->put(CDir::PIN_PTRWAITER);
+ }
+};
+
+
+bool Migrator::export_try_grab_locks(CDir *dir, MutationRef& mut)
+{
+ CInode *diri = dir->get_inode();
+
+ if (!diri->filelock.can_wrlock(diri->get_loner()) ||
+ !diri->nestlock.can_wrlock(diri->get_loner()))
+ return false;
+
+ MutationImpl::LockOpVec lov;
+
+ set<CDir*> wouldbe_bounds;
+ set<CInode*> bound_inodes;
+ mdcache->get_wouldbe_subtree_bounds(dir, wouldbe_bounds);
+ for (auto& bound : wouldbe_bounds)
+ bound_inodes.insert(bound->get_inode());
+ for (auto& in : bound_inodes)
+ lov.add_rdlock(&in->dirfragtreelock);
+
+ lov.add_rdlock(&diri->dirfragtreelock);
+
+ CInode* in = diri;
+ while (true) {
+ lov.add_rdlock(&in->snaplock);
+ CDentry* pdn = in->get_projected_parent_dn();
+ if (!pdn)
+ break;
+ in = pdn->get_dir()->get_inode();
+ }
+
+ if (!mds->locker->rdlock_try_set(lov, mut))
+ return false;
+
+ mds->locker->wrlock_force(&diri->filelock, mut);
+ mds->locker->wrlock_force(&diri->nestlock, mut);
+
+ return true;
+}
+
+
+/** export_dir(dir, dest)
+ * public method to initiate an export.
+ * will fail if the directory is freezing, frozen, unpinnable, or root.
+ */
+void Migrator::export_dir(CDir *dir, mds_rank_t dest)
+{
+ ceph_assert(dir->is_auth());
+ ceph_assert(dest != mds->get_nodeid());
+
+ CDir* parent = dir->inode->get_projected_parent_dir();
+ if (!mds->is_stopping() && !dir->is_exportable(dest) && dir->get_num_head_items() > 0) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": dir is export pinned" << dendl;
+ return;
+ } else if (!(mds->is_active() || mds->is_stopping())) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": not active" << dendl;
+ return;
+ } else if (mdcache->is_readonly()) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": read-only FS, no exports for now" << dendl;
+ return;
+ } else if (!mds->mdsmap->is_active(dest)) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": destination not active" << dendl;
+ return;
+ } else if (mds->is_cluster_degraded()) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": cluster degraded" << dendl;
+ return;
+ } else if (dir->inode->is_system()) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": is a system directory" << dendl;
+ return;
+ } else if (dir->is_frozen() || dir->is_freezing()) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": is frozen" << dendl;
+ return;
+ } else if (dir->state_test(CDir::STATE_EXPORTING)) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": already exporting" << dendl;
+ return;
+ } else if (parent && parent->inode->is_stray()
+ && parent->get_parent_dir()->ino() != MDS_INO_MDSDIR(dest)) {
+ dout(7) << "Cannot export to mds." << dest << " " << *dir << ": in stray directory" << dendl;
+ return;
+ }
+
+ if (unlikely(g_conf()->mds_thrash_exports)) {
+ // create random subtree bound (which will not be exported)
+ std::vector<CDir*> ls;
+ for (auto p = dir->begin(); p != dir->end(); ++p) {
+ auto dn = p->second;
+ CDentry::linkage_t *dnl= dn->get_linkage();
+ if (dnl->is_primary()) {
+ CInode *in = dnl->get_inode();
+ if (in->is_dir()) {
+ auto&& dirs = in->get_nested_dirfrags();
+ ls.insert(std::end(ls), std::begin(dirs), std::end(dirs));
+ }
+ }
+ }
+ if (ls.size() > 0) {
+ int n = rand() % ls.size();
+ auto p = ls.begin();
+ while (n--) ++p;
+ CDir *bd = *p;
+ if (!(bd->is_frozen() || bd->is_freezing())) {
+ ceph_assert(bd->is_auth());
+ dir->state_set(CDir::STATE_AUXSUBTREE);
+ mdcache->adjust_subtree_auth(dir, mds->get_nodeid());
+ dout(7) << "create aux subtree " << *bd << " under " << *dir << dendl;
+ }
+ }
+ }
+
+ dout(4) << "Starting export to mds." << dest << " " << *dir << dendl;
+
+ mds->hit_export_target(dest, -1);
+
+ dir->auth_pin(this);
+ dir->mark_exporting();
+
+ MDRequestRef mdr = mdcache->request_start_internal(CEPH_MDS_OP_EXPORTDIR);
+ mdr->more()->export_dir = dir;
+ mdr->pin(dir);
+
+ ceph_assert(export_state.count(dir) == 0);
+ export_state_t& stat = export_state[dir];
+ num_locking_exports++;
+ stat.state = EXPORT_LOCKING;
+ stat.peer = dest;
+ stat.tid = mdr->reqid.tid;
+ stat.mut = mdr;
+
+ mdcache->dispatch_request(mdr);
+}
+
+/*
+ * check if directory is too large to be export in whole. If it is,
+ * choose some subdirs, whose total size is suitable.
+ */
+void Migrator::maybe_split_export(CDir* dir, uint64_t max_size, bool null_okay,
+ vector<pair<CDir*, size_t> >& results)
+{
+ static const unsigned frag_size = 800;
+ static const unsigned inode_size = 1000;
+ static const unsigned cap_size = 80;
+ static const unsigned remote_size = 10;
+ static const unsigned null_size = 1;
+
+ // state for depth-first search
+ struct LevelData {
+ CDir *dir;
+ CDir::dentry_key_map::iterator iter;
+ size_t dirfrag_size = frag_size;
+ size_t subdirs_size = 0;
+ bool complete = true;
+ vector<CDir*> siblings;
+ vector<pair<CDir*, size_t> > subdirs;
+ LevelData(const LevelData&) = default;
+ LevelData(CDir *d) :
+ dir(d), iter(d->begin()) {}
+ };
+
+ vector<LevelData> stack;
+ stack.emplace_back(dir);
+
+ size_t found_size = 0;
+ size_t skipped_size = 0;
+
+ for (;;) {
+ auto& data = stack.back();
+ CDir *cur = data.dir;
+ auto& it = data.iter;
+ auto& dirfrag_size = data.dirfrag_size;
+
+ while(it != cur->end()) {
+ CDentry *dn = it->second;
+ ++it;
+
+ dirfrag_size += dn->name.size();
+ if (dn->get_linkage()->is_null()) {
+ dirfrag_size += null_size;
+ continue;
+ }
+ if (dn->get_linkage()->is_remote()) {
+ dirfrag_size += remote_size;
+ continue;
+ }
+
+ CInode *in = dn->get_linkage()->get_inode();
+ dirfrag_size += inode_size;
+ dirfrag_size += in->get_client_caps().size() * cap_size;
+
+ if (in->is_dir()) {
+ auto ls = in->get_nested_dirfrags();
+ std::reverse(ls.begin(), ls.end());
+
+ bool complete = true;
+ for (auto p = ls.begin(); p != ls.end(); ) {
+ if ((*p)->state_test(CDir::STATE_EXPORTING) ||
+ (*p)->is_freezing_dir() || (*p)->is_frozen_dir()) {
+ complete = false;
+ p = ls.erase(p);
+ } else {
+ ++p;
+ }
+ }
+ if (!complete) {
+ // skip exporting dir's ancestors. because they can't get
+ // frozen (exporting dir's parent inode is auth pinned).
+ for (auto p = stack.rbegin(); p < stack.rend(); ++p) {
+ if (!p->complete)
+ break;
+ p->complete = false;
+ }
+ }
+ if (!ls.empty()) {
+ stack.emplace_back(ls.back());
+ ls.pop_back();
+ stack.back().siblings.swap(ls);
+ break;
+ }
+ }
+ }
+ // did above loop push new dirfrag into the stack?
+ if (stack.back().dir != cur)
+ continue;
+
+ if (data.complete) {
+ auto cur_size = data.subdirs_size + dirfrag_size;
+ // we can do nothing with large dirfrag
+ if (cur_size >= max_size && found_size * 2 > max_size)
+ break;
+
+ found_size += dirfrag_size;
+
+ if (stack.size() > 1) {
+ auto& parent = stack[stack.size() - 2];
+ parent.subdirs.emplace_back(cur, cur_size);
+ parent.subdirs_size += cur_size;
+ }
+ } else {
+ // can't merge current dirfrag to its parent if there is skipped subdir
+ results.insert(results.end(), data.subdirs.begin(), data.subdirs.end());
+ skipped_size += dirfrag_size;
+ }
+
+ vector<CDir*> ls;
+ ls.swap(data.siblings);
+
+ stack.pop_back();
+ if (stack.empty())
+ break;
+
+ if (found_size >= max_size)
+ break;
+
+ // next dirfrag
+ if (!ls.empty()) {
+ stack.emplace_back(ls.back());
+ ls.pop_back();
+ stack.back().siblings.swap(ls);
+ }
+ }
+
+ for (auto& p : stack)
+ results.insert(results.end(), p.subdirs.begin(), p.subdirs.end());
+
+ if (results.empty() && (!skipped_size || !null_okay))
+ results.emplace_back(dir, found_size + skipped_size);
+}
+
+class C_M_ExportDirWait : public MigratorContext {
+ MDRequestRef mdr;
+ int count;
+public:
+ C_M_ExportDirWait(Migrator *m, MDRequestRef mdr, int count)
+ : MigratorContext(m), mdr(mdr), count(count) {}
+ void finish(int r) override {
+ mig->dispatch_export_dir(mdr, count);
+ }
+};
+
+void Migrator::dispatch_export_dir(MDRequestRef& mdr, int count)
+{
+ CDir *dir = mdr->more()->export_dir;
+ dout(7) << *mdr << " " << *dir << dendl;
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end() || it->second.tid != mdr->reqid.tid) {
+ // export must have aborted.
+ dout(7) << "export must have aborted " << *mdr << dendl;
+ ceph_assert(mdr->killed || mdr->aborted);
+ if (mdr->aborted) {
+ mdr->aborted = false;
+ mdcache->request_kill(mdr);
+ }
+ return;
+ }
+ ceph_assert(it->second.state == EXPORT_LOCKING);
+
+ if (mdr->more()->peer_error || dir->is_frozen() || dir->is_freezing()) {
+ dout(7) << "wouldblock|freezing|frozen, canceling export" << dendl;
+ export_try_cancel(dir);
+ return;
+ }
+
+ mds_rank_t dest = it->second.peer;
+ if (!mds->is_export_target(dest)) {
+ dout(7) << "dest is not yet an export target" << dendl;
+ if (count > 3) {
+ dout(7) << "dest has not been added as export target after three MDSMap epochs, canceling export" << dendl;
+ export_try_cancel(dir);
+ return;
+ }
+
+ mds->locker->drop_locks(mdr.get());
+ mdr->drop_local_auth_pins();
+
+ mds->wait_for_mdsmap(mds->mdsmap->get_epoch(), new C_M_ExportDirWait(this, mdr, count+1));
+ return;
+ }
+
+ if (!dir->inode->get_parent_dn()) {
+ dout(7) << "waiting for dir to become stable before export: " << *dir << dendl;
+ dir->add_waiter(CDir::WAIT_CREATED, new C_M_ExportDirWait(this, mdr, 1));
+ return;
+ }
+
+ // locks?
+ if (!(mdr->locking_state & MutationImpl::ALL_LOCKED)) {
+ MutationImpl::LockOpVec lov;
+ // If auth MDS of the subtree root inode is neither the exporter MDS
+ // nor the importer MDS and it gathers subtree root's fragstat/neststat
+ // while the subtree is exporting. It's possible that the exporter MDS
+ // and the importer MDS both are auth MDS of the subtree root or both
+ // are not auth MDS of the subtree root at the time they receive the
+ // lock messages. So the auth MDS of the subtree root inode may get no
+ // or duplicated fragstat/neststat for the subtree root dirfrag.
+ lov.lock_scatter_gather(&dir->get_inode()->filelock);
+ lov.lock_scatter_gather(&dir->get_inode()->nestlock);
+ if (dir->get_inode()->is_auth()) {
+ dir->get_inode()->filelock.set_scatter_wanted();
+ dir->get_inode()->nestlock.set_scatter_wanted();
+ }
+ lov.add_rdlock(&dir->get_inode()->dirfragtreelock);
+
+ if (!mds->locker->acquire_locks(mdr, lov, nullptr, true)) {
+ if (mdr->aborted)
+ export_try_cancel(dir);
+ return;
+ }
+
+ lov.clear();
+ // bound dftlocks:
+ // NOTE: We need to take an rdlock on bounding dirfrags during
+ // migration for a rather irritating reason: when we export the
+ // bound inode, we need to send scatterlock state for the dirfrags
+ // as well, so that the new auth also gets the correct info. If we
+ // race with a refragment, this info is useless, as we can't
+ // redivvy it up. And it's needed for the scatterlocks to work
+ // properly: when the auth is in a sync/lock state it keeps each
+ // dirfrag's portion in the local (auth OR replica) dirfrag.
+ set<CDir*> wouldbe_bounds;
+ set<CInode*> bound_inodes;
+ mdcache->get_wouldbe_subtree_bounds(dir, wouldbe_bounds);
+ for (auto& bound : wouldbe_bounds)
+ bound_inodes.insert(bound->get_inode());
+ for (auto& in : bound_inodes)
+ lov.add_rdlock(&in->dirfragtreelock);
+
+ if (!mds->locker->rdlock_try_set(lov, mdr))
+ return;
+
+ if (!mds->locker->try_rdlock_snap_layout(dir->get_inode(), mdr))
+ return;
+
+ mdr->locking_state |= MutationImpl::ALL_LOCKED;
+ }
+
+ ceph_assert(g_conf()->mds_kill_export_at != 1);
+
+ auto parent = it->second.parent;
+
+ vector<pair<CDir*, size_t> > results;
+ maybe_split_export(dir, max_export_size, (bool)parent, results);
+
+ if (results.size() == 1 && results.front().first == dir) {
+ num_locking_exports--;
+ it->second.state = EXPORT_DISCOVERING;
+ // send ExportDirDiscover (ask target)
+ filepath path;
+ dir->inode->make_path(path);
+ auto discover = make_message<MExportDirDiscover>(dir->dirfrag(), path,
+ mds->get_nodeid(),
+ it->second.tid);
+ mds->send_message_mds(discover, dest);
+ ceph_assert(g_conf()->mds_kill_export_at != 2);
+
+ it->second.last_cum_auth_pins_change = ceph_clock_now();
+ it->second.approx_size = results.front().second;
+ total_exporting_size += it->second.approx_size;
+
+ // start the freeze, but hold it up with an auth_pin.
+ dir->freeze_tree();
+ ceph_assert(dir->is_freezing_tree());
+ dir->add_waiter(CDir::WAIT_FROZEN, new C_MDC_ExportFreeze(this, dir, it->second.tid));
+ return;
+ }
+
+ if (parent) {
+ parent->pending_children += results.size();
+ } else {
+ parent = std::make_shared<export_base_t>(dir->dirfrag(), dest,
+ results.size(), export_queue_gen);
+ }
+
+ if (results.empty()) {
+ dout(7) << "subtree's children all are under exporting, retry rest parts of parent export "
+ << parent->dirfrag << dendl;
+ parent->restart = true;
+ } else {
+ dout(7) << "subtree is too large, splitting it into: " << dendl;
+ }
+
+ for (auto& p : results) {
+ CDir *sub = p.first;
+ ceph_assert(sub != dir);
+ dout(7) << " sub " << *sub << dendl;
+
+ sub->auth_pin(this);
+ sub->mark_exporting();
+
+ MDRequestRef _mdr = mdcache->request_start_internal(CEPH_MDS_OP_EXPORTDIR);
+ _mdr->more()->export_dir = sub;
+ _mdr->pin(sub);
+
+ ceph_assert(export_state.count(sub) == 0);
+ auto& stat = export_state[sub];
+ num_locking_exports++;
+ stat.state = EXPORT_LOCKING;
+ stat.peer = dest;
+ stat.tid = _mdr->reqid.tid;
+ stat.mut = _mdr;
+ stat.parent = parent;
+ mdcache->dispatch_request(_mdr);
+ }
+
+ // cancel the original one
+ export_try_cancel(dir);
+}
+
+void Migrator::child_export_finish(std::shared_ptr<export_base_t>& parent, bool success)
+{
+ if (success)
+ parent->restart = true;
+ if (--parent->pending_children == 0) {
+ if (parent->restart &&
+ parent->export_queue_gen == export_queue_gen) {
+ CDir *origin = mdcache->get_dirfrag(parent->dirfrag);
+ if (origin && origin->is_auth()) {
+ dout(7) << "child_export_finish requeue " << *origin << dendl;
+ export_queue.emplace_front(origin->dirfrag(), parent->dest);
+ }
+ }
+ }
+}
+
+/*
+ * called on receipt of MExportDirDiscoverAck
+ * the importer now has the directory's _inode_ in memory, and pinned.
+ */
+void Migrator::handle_export_discover_ack(const cref_t<MExportDirDiscoverAck> &m)
+{
+ CDir *dir = mdcache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ ceph_assert(dir);
+
+ dout(7) << "from " << m->get_source()
+ << " on " << *dir << dendl;
+
+ mds->hit_export_target(dest, -1);
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end() ||
+ it->second.tid != m->get_tid() ||
+ it->second.peer != dest) {
+ dout(7) << "must have aborted" << dendl;
+ } else {
+ ceph_assert(it->second.state == EXPORT_DISCOVERING);
+
+ if (m->is_success()) {
+ // release locks to avoid deadlock
+ MDRequestRef mdr = static_cast<MDRequestImpl*>(it->second.mut.get());
+ ceph_assert(mdr);
+ mdcache->request_finish(mdr);
+ it->second.mut.reset();
+ // freeze the subtree
+ it->second.state = EXPORT_FREEZING;
+ dir->auth_unpin(this);
+ ceph_assert(g_conf()->mds_kill_export_at != 3);
+
+ } else {
+ dout(7) << "peer failed to discover (not active?), canceling" << dendl;
+ export_try_cancel(dir, false);
+ }
+ }
+}
+
+class C_M_ExportSessionsFlushed : public MigratorContext {
+ CDir *dir;
+ uint64_t tid;
+public:
+ C_M_ExportSessionsFlushed(Migrator *m, CDir *d, uint64_t t) :
+ MigratorContext(m), dir(d), tid(t) {
+ dir->get(CDir::PIN_PTRWAITER);
+ }
+ void finish(int r) override {
+ mig->export_sessions_flushed(dir, tid);
+ dir->put(CDir::PIN_PTRWAITER);
+ }
+};
+
+void Migrator::export_sessions_flushed(CDir *dir, uint64_t tid)
+{
+ dout(7) << *dir << dendl;
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end() ||
+ it->second.state == EXPORT_CANCELLING ||
+ it->second.tid != tid) {
+ // export must have aborted.
+ dout(7) << "export must have aborted on " << dir << dendl;
+ return;
+ }
+
+ ceph_assert(it->second.state == EXPORT_PREPPING || it->second.state == EXPORT_WARNING);
+ ceph_assert(it->second.warning_ack_waiting.count(MDS_RANK_NONE) > 0);
+ it->second.warning_ack_waiting.erase(MDS_RANK_NONE);
+ if (it->second.state == EXPORT_WARNING && it->second.warning_ack_waiting.empty())
+ export_go(dir); // start export.
+}
+
+void Migrator::encode_export_prep_trace(bufferlist &final_bl, CDir *bound,
+ CDir *dir, export_state_t &es,
+ set<inodeno_t> &inodes_added,
+ set<dirfrag_t> &dirfrags_added)
+{
+ ENCODE_START(1, 1, final_bl);
+
+ dout(7) << " started to encode dir " << *bound << dendl;
+ CDir *cur = bound;
+ bufferlist tracebl;
+ char start = '-';
+
+ while (1) {
+ // don't repeat inodes
+ if (inodes_added.count(cur->inode->ino()))
+ break;
+ inodes_added.insert(cur->inode->ino());
+
+ // prepend dentry + inode
+ ceph_assert(cur->inode->is_auth());
+ bufferlist bl;
+ mdcache->encode_replica_dentry(cur->inode->parent, es.peer, bl);
+ dout(7) << " added " << *cur->inode->parent << dendl;
+ mdcache->encode_replica_inode(cur->inode, es.peer, bl, mds->mdsmap->get_up_features());
+ dout(7) << " added " << *cur->inode << dendl;
+ bl.claim_append(tracebl);
+ tracebl = std::move(bl);
+
+ cur = cur->get_parent_dir();
+ // don't repeat dirfrags
+ if (dirfrags_added.count(cur->dirfrag()) || cur == dir) {
+ start = 'd'; // start with dentry
+ break;
+ }
+ dirfrags_added.insert(cur->dirfrag());
+
+ // prepend dir
+ mdcache->encode_replica_dir(cur, es.peer, bl);
+ dout(7) << " added " << *cur << dendl;
+ bl.claim_append(tracebl);
+ tracebl = std::move(bl);
+ start = 'f'; // start with dirfrag
+ }
+ dirfrag_t df = cur->dirfrag();
+ encode(df, final_bl);
+ encode(start, final_bl);
+ final_bl.claim_append(tracebl);
+
+ ENCODE_FINISH(final_bl);
+}
+
+void Migrator::export_frozen(CDir *dir, uint64_t tid)
+{
+ dout(7) << *dir << dendl;
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end() || it->second.tid != tid) {
+ dout(7) << "export must have aborted" << dendl;
+ return;
+ }
+
+ ceph_assert(it->second.state == EXPORT_FREEZING);
+ ceph_assert(dir->is_frozen_tree_root());
+
+ it->second.mut = new MutationImpl();
+
+ // ok, try to grab all my locks.
+ CInode *diri = dir->get_inode();
+ if ((diri->is_auth() && diri->is_frozen()) ||
+ !export_try_grab_locks(dir, it->second.mut)) {
+ dout(7) << "export_dir couldn't acquire all needed locks, failing. "
+ << *dir << dendl;
+ export_try_cancel(dir);
+ return;
+ }
+
+ if (diri->is_auth())
+ it->second.mut->auth_pin(diri);
+
+ mdcache->show_subtrees();
+
+ // CDir::_freeze_tree() should have forced it into subtree.
+ ceph_assert(dir->get_dir_auth() == mds_authority_t(mds->get_nodeid(), mds->get_nodeid()));
+ // note the bounds.
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ // generate prep message, log entry.
+ auto prep = make_message<MExportDirPrep>(dir->dirfrag(), it->second.tid);
+
+ // include list of bystanders
+ for (const auto &p : dir->get_replicas()) {
+ if (p.first != it->second.peer) {
+ dout(10) << "bystander mds." << p.first << dendl;
+ prep->add_bystander(p.first);
+ }
+ }
+
+ // include base dirfrag
+ mdcache->encode_replica_dir(dir, it->second.peer, prep->basedir);
+
+ /*
+ * include spanning tree for all nested exports.
+ * these need to be on the destination _before_ the final export so that
+ * dir_auth updates on any nested exports are properly absorbed.
+ * this includes inodes and dirfrags included in the subtree, but
+ * only the inodes at the bounds.
+ *
+ * each trace is: df ('-' | ('f' dir | 'd') dentry inode (dir dentry inode)*)
+ */
+ set<inodeno_t> inodes_added;
+ set<dirfrag_t> dirfrags_added;
+
+ // check bounds
+ for (auto &bound : bounds){
+ // pin it.
+ bound->get(CDir::PIN_EXPORTBOUND);
+ bound->state_set(CDir::STATE_EXPORTBOUND);
+
+ dout(7) << " export bound " << *bound << dendl;
+ prep->add_bound( bound->dirfrag() );
+
+ bufferlist final_bl;
+ encode_export_prep_trace(final_bl, bound, dir, it->second, inodes_added, dirfrags_added);
+ prep->add_trace(final_bl);
+ }
+
+ // send.
+ it->second.state = EXPORT_PREPPING;
+ mds->send_message_mds(prep, it->second.peer);
+ ceph_assert(g_conf()->mds_kill_export_at != 4);
+
+ // make sure any new instantiations of caps are flushed out
+ ceph_assert(it->second.warning_ack_waiting.empty());
+
+ set<client_t> export_client_set;
+ get_export_client_set(dir, export_client_set);
+
+ MDSGatherBuilder gather(g_ceph_context);
+ mds->server->flush_client_sessions(export_client_set, gather);
+ if (gather.has_subs()) {
+ it->second.warning_ack_waiting.insert(MDS_RANK_NONE);
+ gather.set_finisher(new C_M_ExportSessionsFlushed(this, dir, it->second.tid));
+ gather.activate();
+ }
+}
+
+void Migrator::get_export_client_set(CDir *dir, set<client_t>& client_set)
+{
+ deque<CDir*> dfs;
+ dfs.push_back(dir);
+ while (!dfs.empty()) {
+ CDir *dir = dfs.front();
+ dfs.pop_front();
+ for (auto& p : *dir) {
+ CDentry *dn = p.second;
+ if (!dn->get_linkage()->is_primary())
+ continue;
+ CInode *in = dn->get_linkage()->get_inode();
+ if (in->is_dir()) {
+ // directory?
+ auto&& ls = in->get_dirfrags();
+ for (auto& q : ls) {
+ if (!q->state_test(CDir::STATE_EXPORTBOUND)) {
+ // include nested dirfrag
+ ceph_assert(q->get_dir_auth().first == CDIR_AUTH_PARENT);
+ dfs.push_back(q); // it's ours, recurse (later)
+ }
+ }
+ }
+ for (auto& q : in->get_client_caps()) {
+ client_set.insert(q.first);
+ }
+ }
+ }
+}
+
+void Migrator::get_export_client_set(CInode *in, set<client_t>& client_set)
+{
+ for (const auto &p : in->get_client_caps()) {
+ client_set.insert(p.first);
+ }
+}
+
+void Migrator::handle_export_prep_ack(const cref_t<MExportDirPrepAck> &m)
+{
+ CDir *dir = mdcache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ ceph_assert(dir);
+
+ dout(7) << *dir << dendl;
+
+ mds->hit_export_target(dest, -1);
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end() ||
+ it->second.tid != m->get_tid() ||
+ it->second.peer != mds_rank_t(m->get_source().num())) {
+ // export must have aborted.
+ dout(7) << "export must have aborted" << dendl;
+ return;
+ }
+ ceph_assert(it->second.state == EXPORT_PREPPING);
+
+ if (!m->is_success()) {
+ dout(7) << "peer couldn't acquire all needed locks or wasn't active, canceling" << dendl;
+ export_try_cancel(dir, false);
+ return;
+ }
+
+ ceph_assert(g_conf()->mds_kill_export_at != 5);
+ // send warnings
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ ceph_assert(it->second.warning_ack_waiting.empty() ||
+ (it->second.warning_ack_waiting.size() == 1 &&
+ it->second.warning_ack_waiting.count(MDS_RANK_NONE) > 0));
+ ceph_assert(it->second.notify_ack_waiting.empty());
+
+ for (const auto &p : dir->get_replicas()) {
+ if (p.first == it->second.peer) continue;
+ if (mds->is_cluster_degraded() &&
+ !mds->mdsmap->is_clientreplay_or_active_or_stopping(p.first))
+ continue; // only if active
+ it->second.warning_ack_waiting.insert(p.first);
+ it->second.notify_ack_waiting.insert(p.first); // we'll eventually get a notifyack, too!
+
+ auto notify = make_message<MExportDirNotify>(dir->dirfrag(), it->second.tid, true,
+ mds_authority_t(mds->get_nodeid(),CDIR_AUTH_UNKNOWN),
+ mds_authority_t(mds->get_nodeid(),it->second.peer));
+ for (auto &cdir : bounds) {
+ notify->get_bounds().push_back(cdir->dirfrag());
+ }
+ mds->send_message_mds(notify, p.first);
+
+ }
+
+ it->second.state = EXPORT_WARNING;
+
+ ceph_assert(g_conf()->mds_kill_export_at != 6);
+ // nobody to warn?
+ if (it->second.warning_ack_waiting.empty())
+ export_go(dir); // start export.
+}
+
+
+class C_M_ExportGo : public MigratorContext {
+ CDir *dir;
+ uint64_t tid;
+public:
+ C_M_ExportGo(Migrator *m, CDir *d, uint64_t t) :
+ MigratorContext(m), dir(d), tid(t) {
+ dir->get(CDir::PIN_PTRWAITER);
+ }
+ void finish(int r) override {
+ mig->export_go_synced(dir, tid);
+ dir->put(CDir::PIN_PTRWAITER);
+ }
+};
+
+void Migrator::export_go(CDir *dir)
+{
+ auto it = export_state.find(dir);
+ ceph_assert(it != export_state.end());
+ dout(7) << *dir << " to " << it->second.peer << dendl;
+
+ // first sync log to flush out e.g. any cap imports
+ mds->mdlog->wait_for_safe(new C_M_ExportGo(this, dir, it->second.tid));
+ mds->mdlog->flush();
+}
+
+void Migrator::export_go_synced(CDir *dir, uint64_t tid)
+{
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end() ||
+ it->second.state == EXPORT_CANCELLING ||
+ it->second.tid != tid) {
+ // export must have aborted.
+ dout(7) << "export must have aborted on " << dir << dendl;
+ return;
+ }
+ ceph_assert(it->second.state == EXPORT_WARNING);
+ mds_rank_t dest = it->second.peer;
+
+ dout(7) << *dir << " to " << dest << dendl;
+
+ mdcache->show_subtrees();
+
+ it->second.state = EXPORT_EXPORTING;
+ ceph_assert(g_conf()->mds_kill_export_at != 7);
+
+ ceph_assert(dir->is_frozen_tree_root());
+
+ // set ambiguous auth
+ mdcache->adjust_subtree_auth(dir, mds->get_nodeid(), dest);
+
+ // take away the popularity we're sending.
+ mds->balancer->subtract_export(dir);
+
+ // fill export message with cache data
+ auto req = make_message<MExportDir>(dir->dirfrag(), it->second.tid);
+ map<client_t,entity_inst_t> exported_client_map;
+ map<client_t,client_metadata_t> exported_client_metadata_map;
+ uint64_t num_exported_inodes = 0;
+ encode_export_dir(req->export_data, dir, // recur start point
+ exported_client_map, exported_client_metadata_map,
+ num_exported_inodes);
+ encode(exported_client_map, req->client_map, mds->mdsmap->get_up_features());
+ encode(exported_client_metadata_map, req->client_map);
+
+ // add bounds to message
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+ for (set<CDir*>::iterator p = bounds.begin();
+ p != bounds.end();
+ ++p)
+ req->add_export((*p)->dirfrag());
+
+ // send
+ mds->send_message_mds(req, dest);
+ ceph_assert(g_conf()->mds_kill_export_at != 8);
+
+ mds->hit_export_target(dest, num_exported_inodes+1);
+
+ // stats
+ if (mds->logger) mds->logger->inc(l_mds_exported);
+ if (mds->logger) mds->logger->inc(l_mds_exported_inodes, num_exported_inodes);
+
+ mdcache->show_subtrees();
+}
+
+
+/** encode_export_inode
+ * update our local state for this inode to export.
+ * encode relevant state to be sent over the wire.
+ * used by: encode_export_dir, file_rename (if foreign)
+ *
+ * FIXME: the separation between CInode.encode_export and these methods
+ * is pretty arbitrary and dumb.
+ */
+void Migrator::encode_export_inode(CInode *in, bufferlist& enc_state,
+ map<client_t,entity_inst_t>& exported_client_map,
+ map<client_t,client_metadata_t>& exported_client_metadata_map)
+{
+ ENCODE_START(1, 1, enc_state);
+ dout(7) << *in << dendl;
+ ceph_assert(!in->is_replica(mds->get_nodeid()));
+
+ encode(in->ino(), enc_state);
+ encode(in->last, enc_state);
+ in->encode_export(enc_state);
+
+ // caps
+ encode_export_inode_caps(in, true, enc_state, exported_client_map, exported_client_metadata_map);
+ ENCODE_FINISH(enc_state);
+}
+
+void Migrator::encode_export_inode_caps(CInode *in, bool auth_cap, bufferlist& bl,
+ map<client_t,entity_inst_t>& exported_client_map,
+ map<client_t,client_metadata_t>& exported_client_metadata_map)
+{
+ ENCODE_START(1, 1, bl);
+ dout(20) << *in << dendl;
+ // encode caps
+ map<client_t,Capability::Export> cap_map;
+ in->export_client_caps(cap_map);
+ encode(cap_map, bl);
+ if (auth_cap) {
+ encode(in->get_mds_caps_wanted(), bl);
+
+ in->state_set(CInode::STATE_EXPORTINGCAPS);
+ in->get(CInode::PIN_EXPORTINGCAPS);
+ }
+
+ // make note of clients named by exported capabilities
+ for (const auto &p : in->get_client_caps()) {
+ if (exported_client_map.count(p.first))
+ continue;
+ Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(p.first.v));
+ exported_client_map[p.first] = session->info.inst;
+ exported_client_metadata_map[p.first] = session->info.client_metadata;
+ }
+ ENCODE_FINISH(bl);
+}
+
+void Migrator::finish_export_inode_caps(CInode *in, mds_rank_t peer,
+ map<client_t,Capability::Import>& peer_imported)
+{
+ dout(20) << *in << dendl;
+
+ in->state_clear(CInode::STATE_EXPORTINGCAPS);
+ in->put(CInode::PIN_EXPORTINGCAPS);
+
+ // tell (all) clients about migrating caps..
+ for (const auto &p : in->get_client_caps()) {
+ const Capability *cap = &p.second;
+ dout(7) << p.first
+ << " exported caps on " << *in << dendl;
+ auto m = make_message<MClientCaps>(CEPH_CAP_OP_EXPORT, in->ino(), 0,
+ cap->get_cap_id(), cap->get_mseq(),
+ mds->get_osd_epoch_barrier());
+ map<client_t,Capability::Import>::iterator q = peer_imported.find(p.first);
+ ceph_assert(q != peer_imported.end());
+ m->set_cap_peer(q->second.cap_id, q->second.issue_seq, q->second.mseq,
+ (q->second.cap_id > 0 ? peer : -1), 0);
+ mds->send_message_client_counted(m, p.first);
+ }
+ in->clear_client_caps_after_export();
+ mds->locker->eval(in, CEPH_CAP_LOCKS);
+}
+
+void Migrator::finish_export_inode(CInode *in, mds_rank_t peer,
+ map<client_t,Capability::Import>& peer_imported,
+ MDSContext::vec& finished)
+{
+ dout(12) << *in << dendl;
+
+ // clean
+ if (in->is_dirty())
+ in->mark_clean();
+
+ // clear/unpin cached_by (we're no longer the authority)
+ in->clear_replica_map();
+
+ // twiddle lock states for auth -> replica transition
+ in->authlock.export_twiddle();
+ in->linklock.export_twiddle();
+ in->dirfragtreelock.export_twiddle();
+ in->filelock.export_twiddle();
+ in->nestlock.export_twiddle();
+ in->xattrlock.export_twiddle();
+ in->snaplock.export_twiddle();
+ in->flocklock.export_twiddle();
+ in->policylock.export_twiddle();
+
+ // mark auth
+ ceph_assert(in->is_auth());
+ in->state_clear(CInode::STATE_AUTH);
+ in->replica_nonce = CInode::EXPORT_NONCE;
+
+ in->clear_dirty_rstat();
+
+ // no more auth subtree? clear scatter dirty
+ if (!in->has_subtree_root_dirfrag(mds->get_nodeid()))
+ in->clear_scatter_dirty();
+
+ in->clear_dirty_parent();
+
+ in->clear_clientwriteable();
+
+ in->clear_file_locks();
+
+ // waiters
+ in->take_waiting(CInode::WAIT_ANY_MASK, finished);
+
+ in->finish_export();
+
+ finish_export_inode_caps(in, peer, peer_imported);
+}
+
+void Migrator::encode_export_dir(bufferlist& exportbl,
+ CDir *dir,
+ map<client_t,entity_inst_t>& exported_client_map,
+ map<client_t,client_metadata_t>& exported_client_metadata_map,
+ uint64_t &num_exported)
+{
+ // This has to be declared before ENCODE_STARTED as it will need to be referenced after ENCODE_FINISH.
+ std::vector<CDir*> subdirs;
+
+ ENCODE_START(1, 1, exportbl);
+ dout(7) << *dir << " " << dir->get_num_head_items() << " head items" << dendl;
+
+ ceph_assert(dir->get_projected_version() == dir->get_version());
+
+#ifdef MDS_VERIFY_FRAGSTAT
+ if (dir->is_complete())
+ dir->verify_fragstat();
+#endif
+
+ // dir
+ dirfrag_t df = dir->dirfrag();
+ encode(df, exportbl);
+ dir->encode_export(exportbl);
+
+ __u32 nden = dir->items.size();
+ encode(nden, exportbl);
+
+ // dentries
+ for (auto &p : *dir) {
+ CDentry *dn = p.second;
+ CInode *in = dn->get_linkage()->get_inode();
+
+ num_exported++;
+
+ // -- dentry
+ dout(7) << " exporting " << *dn << dendl;
+
+ // dn name
+ encode(dn->get_name(), exportbl);
+ encode(dn->last, exportbl);
+
+ // state
+ dn->encode_export(exportbl);
+
+ // points to...
+
+ // null dentry?
+ if (dn->get_linkage()->is_null()) {
+ exportbl.append("N", 1); // null dentry
+ continue;
+ }
+
+ if (dn->get_linkage()->is_remote()) {
+ inodeno_t ino = dn->get_linkage()->get_remote_ino();
+ unsigned char d_type = dn->get_linkage()->get_remote_d_type();
+ auto& alternate_name = dn->alternate_name;
+ // remote link
+ CDentry::encode_remote(ino, d_type, alternate_name, exportbl);
+ continue;
+ }
+
+ // primary link
+ // -- inode
+ exportbl.append("i", 1); // inode dentry
+
+ ENCODE_START(2, 1, exportbl);
+ encode_export_inode(in, exportbl, exported_client_map, exported_client_metadata_map); // encode, and (update state for) export
+ encode(dn->alternate_name, exportbl);
+ ENCODE_FINISH(exportbl);
+
+ // directory?
+ auto&& dfs = in->get_dirfrags();
+ for (const auto& t : dfs) {
+ if (!t->state_test(CDir::STATE_EXPORTBOUND)) {
+ // include nested dirfrag
+ ceph_assert(t->get_dir_auth().first == CDIR_AUTH_PARENT);
+ subdirs.push_back(t); // it's ours, recurse (later)
+ }
+ }
+ }
+
+ ENCODE_FINISH(exportbl);
+ // subdirs
+ for (const auto &dir : subdirs) {
+ encode_export_dir(exportbl, dir, exported_client_map, exported_client_metadata_map, num_exported);
+ }
+}
+
+void Migrator::finish_export_dir(CDir *dir, mds_rank_t peer,
+ map<inodeno_t,map<client_t,Capability::Import> >& peer_imported,
+ MDSContext::vec& finished, int *num_dentries)
+{
+ dout(10) << *dir << dendl;
+
+ // release open_by
+ dir->clear_replica_map();
+
+ // mark
+ ceph_assert(dir->is_auth());
+ dir->state_clear(CDir::STATE_AUTH);
+ dir->remove_bloom();
+ dir->replica_nonce = CDir::EXPORT_NONCE;
+
+ if (dir->is_dirty())
+ dir->mark_clean();
+
+ // suck up all waiters
+ dir->take_waiting(CDir::WAIT_ANY_MASK, finished); // all dir waiters
+
+ // pop
+ dir->finish_export();
+
+ // dentries
+ std::vector<CDir*> subdirs;
+ for (auto &p : *dir) {
+ CDentry *dn = p.second;
+ CInode *in = dn->get_linkage()->get_inode();
+
+ // dentry
+ dn->finish_export();
+
+ // inode?
+ if (dn->get_linkage()->is_primary()) {
+ finish_export_inode(in, peer, peer_imported[in->ino()], finished);
+
+ // subdirs?
+ auto&& dirs = in->get_nested_dirfrags();
+ subdirs.insert(std::end(subdirs), std::begin(dirs), std::end(dirs));
+ }
+
+ mdcache->touch_dentry_bottom(dn); // move dentry to tail of LRU
+ ++(*num_dentries);
+ }
+
+ // subdirs
+ for (const auto& dir : subdirs) {
+ finish_export_dir(dir, peer, peer_imported, finished, num_dentries);
+ }
+}
+
+class C_MDS_ExportFinishLogged : public MigratorLogContext {
+ CDir *dir;
+public:
+ C_MDS_ExportFinishLogged(Migrator *m, CDir *d) : MigratorLogContext(m), dir(d) {}
+ void finish(int r) override {
+ mig->export_logged_finish(dir);
+ }
+};
+
+
+/*
+ * i should get an export_ack from the export target.
+ */
+void Migrator::handle_export_ack(const cref_t<MExportDirAck> &m)
+{
+ CDir *dir = mdcache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ ceph_assert(dir);
+ ceph_assert(dir->is_frozen_tree_root()); // i'm exporting!
+
+ // yay!
+ dout(7) << *dir << dendl;
+
+ mds->hit_export_target(dest, -1);
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ ceph_assert(it != export_state.end());
+ ceph_assert(it->second.state == EXPORT_EXPORTING);
+ ceph_assert(it->second.tid == m->get_tid());
+
+ auto bp = m->imported_caps.cbegin();
+ decode(it->second.peer_imported, bp);
+
+ it->second.state = EXPORT_LOGGINGFINISH;
+ ceph_assert(g_conf()->mds_kill_export_at != 9);
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ // log completion.
+ // include export bounds, to ensure they're in the journal.
+ EExport *le = new EExport(mds->mdlog, dir, it->second.peer);;
+ mds->mdlog->start_entry(le);
+
+ le->metablob.add_dir_context(dir, EMetaBlob::TO_ROOT);
+ le->metablob.add_dir(dir, false);
+ for (set<CDir*>::iterator p = bounds.begin();
+ p != bounds.end();
+ ++p) {
+ CDir *bound = *p;
+ le->get_bounds().insert(bound->dirfrag());
+ le->metablob.add_dir_context(bound);
+ le->metablob.add_dir(bound, false);
+ }
+
+ // list us second, them first.
+ // this keeps authority().first in sync with subtree auth state in the journal.
+ mdcache->adjust_subtree_auth(dir, it->second.peer, mds->get_nodeid());
+
+ // log export completion, then finish (unfreeze, trigger finish context, etc.)
+ mds->mdlog->submit_entry(le, new C_MDS_ExportFinishLogged(this, dir));
+ mds->mdlog->flush();
+ ceph_assert(g_conf()->mds_kill_export_at != 10);
+}
+
+void Migrator::export_notify_abort(CDir *dir, export_state_t& stat, set<CDir*>& bounds)
+{
+ dout(7) << *dir << dendl;
+
+ ceph_assert(stat.state == EXPORT_CANCELLING);
+
+ if (stat.notify_ack_waiting.empty()) {
+ stat.state = EXPORT_CANCELLED;
+ return;
+ }
+
+ dir->auth_pin(this);
+
+ for (set<mds_rank_t>::iterator p = stat.notify_ack_waiting.begin();
+ p != stat.notify_ack_waiting.end();
+ ++p) {
+ auto notify = make_message<MExportDirNotify>(dir->dirfrag(), stat.tid, true,
+ pair<int,int>(mds->get_nodeid(), stat.peer),
+ pair<int,int>(mds->get_nodeid(), CDIR_AUTH_UNKNOWN));
+ for (set<CDir*>::iterator i = bounds.begin(); i != bounds.end(); ++i)
+ notify->get_bounds().push_back((*i)->dirfrag());
+ mds->send_message_mds(notify, *p);
+ }
+}
+
+/*
+ * this happens if the dest failes after i send the export data but before it is acked
+ * that is, we don't know they safely received and logged it, so we reverse our changes
+ * and go on.
+ */
+void Migrator::export_reverse(CDir *dir, export_state_t& stat)
+{
+ dout(7) << *dir << dendl;
+
+ set<CInode*> to_eval;
+
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ // remove exporting pins
+ std::deque<CDir*> rq;
+ rq.push_back(dir);
+ while (!rq.empty()) {
+ CDir *t = rq.front();
+ rq.pop_front();
+ t->abort_export();
+ for (auto &p : *t) {
+ CDentry *dn = p.second;
+ dn->abort_export();
+ if (!dn->get_linkage()->is_primary())
+ continue;
+ CInode *in = dn->get_linkage()->get_inode();
+ in->abort_export();
+ if (in->state_test(CInode::STATE_EVALSTALECAPS)) {
+ in->state_clear(CInode::STATE_EVALSTALECAPS);
+ to_eval.insert(in);
+ }
+ if (in->is_dir()) {
+ auto&& dirs = in->get_nested_dirfrags();
+ for (const auto& dir : dirs) {
+ rq.push_back(dir);
+ }
+ }
+ }
+ }
+
+ // unpin bounds
+ for (auto bd : bounds) {
+ bd->put(CDir::PIN_EXPORTBOUND);
+ bd->state_clear(CDir::STATE_EXPORTBOUND);
+ }
+
+ // notify bystanders
+ export_notify_abort(dir, stat, bounds);
+
+ // unfreeze tree, with possible subtree merge.
+ mdcache->adjust_subtree_auth(dir, mds->get_nodeid(), mds->get_nodeid());
+
+ // process delayed expires
+ mdcache->process_delayed_expire(dir);
+
+ dir->unfreeze_tree();
+ mdcache->try_subtree_merge(dir);
+
+ // revoke/resume stale caps
+ for (auto in : to_eval) {
+ bool need_issue = false;
+ for (auto &p : in->client_caps) {
+ Capability *cap = &p.second;
+ if (!cap->is_stale()) {
+ need_issue = true;
+ break;
+ }
+ }
+ if (need_issue &&
+ (!in->is_auth() || !mds->locker->eval(in, CEPH_CAP_LOCKS)))
+ mds->locker->issue_caps(in);
+ }
+
+ mdcache->show_cache();
+}
+
+
+/*
+ * once i get the ack, and logged the EExportFinish(true),
+ * send notifies (if any), otherwise go straight to finish.
+ *
+ */
+void Migrator::export_logged_finish(CDir *dir)
+{
+ dout(7) << *dir << dendl;
+
+ export_state_t& stat = export_state[dir];
+
+ // send notifies
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ for (set<mds_rank_t>::iterator p = stat.notify_ack_waiting.begin();
+ p != stat.notify_ack_waiting.end();
+ ++p) {
+ auto notify = make_message<MExportDirNotify>(dir->dirfrag(), stat.tid, true,
+ pair<int,int>(mds->get_nodeid(), stat.peer),
+ pair<int,int>(stat.peer, CDIR_AUTH_UNKNOWN));
+
+ for (set<CDir*>::iterator i = bounds.begin(); i != bounds.end(); ++i)
+ notify->get_bounds().push_back((*i)->dirfrag());
+
+ mds->send_message_mds(notify, *p);
+ }
+
+ // wait for notifyacks
+ stat.state = EXPORT_NOTIFYING;
+ ceph_assert(g_conf()->mds_kill_export_at != 11);
+
+ // no notifies to wait for?
+ if (stat.notify_ack_waiting.empty()) {
+ export_finish(dir); // skip notify/notify_ack stage.
+ } else {
+ // notify peer to send cap import messages to clients
+ if (!mds->is_cluster_degraded() ||
+ mds->mdsmap->is_clientreplay_or_active_or_stopping(stat.peer)) {
+ mds->send_message_mds(make_message<MExportDirFinish>(dir->dirfrag(), false, stat.tid), stat.peer);
+ } else {
+ dout(7) << "not sending MExportDirFinish, dest has failed" << dendl;
+ }
+ }
+}
+
+/*
+ * warning:
+ * i'll get an ack from each bystander.
+ * when i get them all, do the export.
+ * notify:
+ * i'll get an ack from each bystander.
+ * when i get them all, unfreeze and send the finish.
+ */
+void Migrator::handle_export_notify_ack(const cref_t<MExportDirNotifyAck> &m)
+{
+ CDir *dir = mdcache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ ceph_assert(dir);
+ mds_rank_t from = mds_rank_t(m->get_source().num());
+
+ mds->hit_export_target(dest, -1);
+
+ auto export_state_entry = export_state.find(dir);
+ if (export_state_entry != export_state.end()) {
+ export_state_t& stat = export_state_entry->second;
+ if (stat.state == EXPORT_WARNING &&
+ stat.warning_ack_waiting.erase(from)) {
+ // exporting. process warning.
+ dout(7) << "from " << m->get_source()
+ << ": exporting, processing warning on " << *dir << dendl;
+ if (stat.warning_ack_waiting.empty())
+ export_go(dir); // start export.
+ } else if (stat.state == EXPORT_NOTIFYING &&
+ stat.notify_ack_waiting.erase(from)) {
+ // exporting. process notify.
+ dout(7) << "from " << m->get_source()
+ << ": exporting, processing notify on " << *dir << dendl;
+ if (stat.notify_ack_waiting.empty())
+ export_finish(dir);
+ } else if (stat.state == EXPORT_CANCELLING &&
+ m->get_new_auth().second == CDIR_AUTH_UNKNOWN && // not warning ack
+ stat.notify_ack_waiting.erase(from)) {
+ dout(7) << "from " << m->get_source()
+ << ": cancelling export, processing notify on " << *dir << dendl;
+ if (stat.notify_ack_waiting.empty()) {
+ export_cancel_finish(export_state_entry);
+ }
+ }
+ }
+ else {
+ auto import_state_entry = import_state.find(dir->dirfrag());
+ if (import_state_entry != import_state.end()) {
+ import_state_t& stat = import_state_entry->second;
+ if (stat.state == IMPORT_ABORTING) {
+ // reversing import
+ dout(7) << "from " << m->get_source()
+ << ": aborting import on " << *dir << dendl;
+ ceph_assert(stat.bystanders.count(from));
+ stat.bystanders.erase(from);
+ if (stat.bystanders.empty())
+ import_reverse_unfreeze(dir);
+ }
+ }
+ }
+}
+
+void Migrator::export_finish(CDir *dir)
+{
+ dout(3) << *dir << dendl;
+
+ ceph_assert(g_conf()->mds_kill_export_at != 12);
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ if (it == export_state.end()) {
+ dout(7) << "target must have failed, not sending final commit message. export succeeded anyway." << dendl;
+ return;
+ }
+
+ // send finish/commit to new auth
+ if (!mds->is_cluster_degraded() ||
+ mds->mdsmap->is_clientreplay_or_active_or_stopping(it->second.peer)) {
+ mds->send_message_mds(make_message<MExportDirFinish>(dir->dirfrag(), true, it->second.tid), it->second.peer);
+ } else {
+ dout(7) << "not sending MExportDirFinish last, dest has failed" << dendl;
+ }
+ ceph_assert(g_conf()->mds_kill_export_at != 13);
+
+ // finish export (adjust local cache state)
+ int num_dentries = 0;
+ MDSContext::vec finished;
+ finish_export_dir(dir, it->second.peer,
+ it->second.peer_imported, finished, &num_dentries);
+
+ ceph_assert(!dir->is_auth());
+ mdcache->adjust_subtree_auth(dir, it->second.peer);
+
+ // unpin bounds
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+ for (set<CDir*>::iterator p = bounds.begin();
+ p != bounds.end();
+ ++p) {
+ CDir *bd = *p;
+ bd->put(CDir::PIN_EXPORTBOUND);
+ bd->state_clear(CDir::STATE_EXPORTBOUND);
+ }
+
+ if (dir->state_test(CDir::STATE_AUXSUBTREE))
+ dir->state_clear(CDir::STATE_AUXSUBTREE);
+
+ // discard delayed expires
+ mdcache->discard_delayed_expire(dir);
+
+ dout(7) << "unfreezing" << dendl;
+
+ // unfreeze tree, with possible subtree merge.
+ // (we do this _after_ removing EXPORTBOUND pins, to allow merges)
+ dir->unfreeze_tree();
+ mdcache->try_subtree_merge(dir);
+
+ // no more auth subtree? clear scatter dirty
+ if (!dir->get_inode()->is_auth() &&
+ !dir->get_inode()->has_subtree_root_dirfrag(mds->get_nodeid())) {
+ dir->get_inode()->clear_scatter_dirty();
+ // wake up scatter_nudge waiters
+ dir->get_inode()->take_waiting(CInode::WAIT_ANY_MASK, finished);
+ }
+
+ if (!finished.empty())
+ mds->queue_waiters(finished);
+
+ MutationRef mut = std::move(it->second.mut);
+ auto parent = std::move(it->second.parent);
+ // remove from exporting list, clean up state
+ total_exporting_size -= it->second.approx_size;
+ export_state.erase(it);
+
+ ceph_assert(dir->state_test(CDir::STATE_EXPORTING));
+ dir->clear_exporting();
+
+ mdcache->show_subtrees();
+ audit();
+
+ mdcache->trim(num_dentries); // try trimming exported dentries
+
+ // send pending import_maps?
+ mdcache->maybe_send_pending_resolves();
+
+ // drop locks, unpin path
+ if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ if (parent)
+ child_export_finish(parent, true);
+
+ maybe_do_queued_export();
+}
+
+
+
+class C_MDS_ExportDiscover : public MigratorContext {
+public:
+ C_MDS_ExportDiscover(Migrator *mig, const cref_t<MExportDirDiscover>& m) : MigratorContext(mig), m(m) {}
+ void finish(int r) override {
+ mig->handle_export_discover(m, true);
+ }
+private:
+ cref_t<MExportDirDiscover> m;
+};
+
+class C_MDS_ExportDiscoverFactory : public MDSContextFactory {
+public:
+ C_MDS_ExportDiscoverFactory(Migrator *mig, cref_t<MExportDirDiscover> m) : mig(mig), m(m) {}
+ MDSContext *build() {
+ return new C_MDS_ExportDiscover(mig, m);
+ }
+private:
+ Migrator *mig;
+ cref_t<MExportDirDiscover> m;
+};
+
+// ==========================================================
+// IMPORT
+
+void Migrator::handle_export_discover(const cref_t<MExportDirDiscover> &m, bool started)
+{
+ mds_rank_t from = m->get_source_mds();
+ ceph_assert(from != mds->get_nodeid());
+
+ dout(7) << m->get_path() << dendl;
+
+ // note import state
+ dirfrag_t df = m->get_dirfrag();
+
+ if (!mds->is_active()) {
+ dout(7) << " not active, send NACK " << dendl;
+ mds->send_message_mds(make_message<MExportDirDiscoverAck>(df, m->get_tid(), false), from);
+ return;
+ }
+
+ // only start discovering on this message once.
+ import_state_t *p_state;
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(df);
+ if (!started) {
+ ceph_assert(it == import_state.end());
+ p_state = &import_state[df];
+ p_state->state = IMPORT_DISCOVERING;
+ p_state->peer = from;
+ p_state->tid = m->get_tid();
+ } else {
+ // am i retrying after ancient path_traverse results?
+ if (it == import_state.end() ||
+ it->second.peer != from ||
+ it->second.tid != m->get_tid()) {
+ dout(7) << " dropping obsolete message" << dendl;
+ return;
+ }
+ ceph_assert(it->second.state == IMPORT_DISCOVERING);
+ p_state = &it->second;
+ }
+
+ C_MDS_ExportDiscoverFactory cf(this, m);
+ if (!mdcache->is_open()) {
+ dout(10) << " waiting for root" << dendl;
+ mds->mdcache->wait_for_open(cf.build());
+ return;
+ }
+
+ ceph_assert(g_conf()->mds_kill_import_at != 1);
+
+ // do we have it?
+ CInode *in = mdcache->get_inode(m->get_dirfrag().ino);
+ if (!in) {
+ // must discover it!
+ filepath fpath(m->get_path());
+ vector<CDentry*> trace;
+ MDRequestRef null_ref;
+ int r = mdcache->path_traverse(null_ref, cf, fpath,
+ MDS_TRAVERSE_DISCOVER | MDS_TRAVERSE_PATH_LOCKED,
+ &trace);
+ if (r > 0) return;
+ if (r < 0) {
+ dout(7) << "failed to discover or not dir " << m->get_path() << ", NAK" << dendl;
+ ceph_abort(); // this shouldn't happen if the auth pins its path properly!!!!
+ }
+
+ ceph_abort(); // this shouldn't happen; the get_inode above would have succeeded.
+ }
+
+ // yay
+ dout(7) << "have " << df << " inode " << *in << dendl;
+
+ p_state->state = IMPORT_DISCOVERED;
+
+ // pin inode in the cache (for now)
+ ceph_assert(in->is_dir());
+ in->get(CInode::PIN_IMPORTING);
+
+ // reply
+ dout(7) << " sending export_discover_ack on " << *in << dendl;
+ mds->send_message_mds(make_message<MExportDirDiscoverAck>(df, m->get_tid()), p_state->peer);
+ ceph_assert(g_conf()->mds_kill_import_at != 2);
+}
+
+void Migrator::import_reverse_discovering(dirfrag_t df)
+{
+ import_state.erase(df);
+}
+
+void Migrator::import_reverse_discovered(dirfrag_t df, CInode *diri)
+{
+ // unpin base
+ diri->put(CInode::PIN_IMPORTING);
+ import_state.erase(df);
+}
+
+void Migrator::import_reverse_prepping(CDir *dir, import_state_t& stat)
+{
+ set<CDir*> bounds;
+ mdcache->map_dirfrag_set(stat.bound_ls, bounds);
+ import_remove_pins(dir, bounds);
+ import_reverse_final(dir);
+}
+
+void Migrator::handle_export_cancel(const cref_t<MExportDirCancel> &m)
+{
+ dout(7) << "on " << m->get_dirfrag() << dendl;
+ dirfrag_t df = m->get_dirfrag();
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(df);
+ if (it == import_state.end()) {
+ ceph_abort_msg("got export_cancel in weird state");
+ } else if (it->second.state == IMPORT_DISCOVERING) {
+ import_reverse_discovering(df);
+ } else if (it->second.state == IMPORT_DISCOVERED) {
+ CInode *in = mdcache->get_inode(df.ino);
+ ceph_assert(in);
+ import_reverse_discovered(df, in);
+ } else if (it->second.state == IMPORT_PREPPING) {
+ CDir *dir = mdcache->get_dirfrag(df);
+ ceph_assert(dir);
+ import_reverse_prepping(dir, it->second);
+ } else if (it->second.state == IMPORT_PREPPED) {
+ CDir *dir = mdcache->get_dirfrag(df);
+ ceph_assert(dir);
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+ import_remove_pins(dir, bounds);
+ // adjust auth back to the exportor
+ mdcache->adjust_subtree_auth(dir, it->second.peer);
+ import_reverse_unfreeze(dir);
+ } else {
+ ceph_abort_msg("got export_cancel in weird state");
+ }
+}
+
+class C_MDS_ExportPrep : public MigratorContext {
+public:
+ C_MDS_ExportPrep(Migrator *mig, const cref_t<MExportDirPrep>& m) : MigratorContext(mig), m(m) {}
+ void finish(int r) override {
+ mig->handle_export_prep(m, true);
+ }
+private:
+ cref_t<MExportDirPrep> m;
+};
+
+class C_MDS_ExportPrepFactory : public MDSContextFactory {
+public:
+ C_MDS_ExportPrepFactory(Migrator *mig, cref_t<MExportDirPrep> m) : mig(mig), m(m) {}
+ MDSContext *build() {
+ return new C_MDS_ExportPrep(mig, m);
+ }
+private:
+ Migrator *mig;
+ cref_t<MExportDirPrep> m;
+};
+
+void Migrator::decode_export_prep_trace(bufferlist::const_iterator& blp, mds_rank_t oldauth, MDSContext::vec& finished)
+{
+ DECODE_START(1, blp);
+ dirfrag_t df;
+ decode(df, blp);
+ char start;
+ decode(start, blp);
+ dout(10) << " trace from " << df << " start " << start << dendl;
+
+ CDir *cur = nullptr;
+ if (start == 'd') {
+ cur = mdcache->get_dirfrag(df);
+ ceph_assert(cur);
+ dout(10) << " had " << *cur << dendl;
+ } else if (start == 'f') {
+ CInode *in = mdcache->get_inode(df.ino);
+ ceph_assert(in);
+ dout(10) << " had " << *in << dendl;
+ mdcache->decode_replica_dir(cur, blp, in, oldauth, finished);
+ dout(10) << " added " << *cur << dendl;
+ } else if (start == '-') {
+ // nothing
+ } else
+ ceph_abort_msg("unrecognized start char");
+
+ while (!blp.end()) {
+ CDentry *dn = nullptr;
+ mdcache->decode_replica_dentry(dn, blp, cur, finished);
+ dout(10) << " added " << *dn << dendl;
+ CInode *in = nullptr;
+ mdcache->decode_replica_inode(in, blp, dn, finished);
+ dout(10) << " added " << *in << dendl;
+ if (blp.end())
+ break;
+ mdcache->decode_replica_dir(cur, blp, in, oldauth, finished);
+ dout(10) << " added " << *cur << dendl;
+ }
+
+ DECODE_FINISH(blp);
+}
+
+void Migrator::handle_export_prep(const cref_t<MExportDirPrep> &m, bool did_assim)
+{
+ mds_rank_t oldauth = mds_rank_t(m->get_source().num());
+ ceph_assert(oldauth != mds->get_nodeid());
+
+ CDir *dir;
+ CInode *diri;
+ MDSContext::vec finished;
+
+ // assimilate root dir.
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(m->get_dirfrag());
+ if (!did_assim) {
+ ceph_assert(it != import_state.end());
+ ceph_assert(it->second.state == IMPORT_DISCOVERED);
+ ceph_assert(it->second.peer == oldauth);
+ diri = mdcache->get_inode(m->get_dirfrag().ino);
+ ceph_assert(diri);
+ auto p = m->basedir.cbegin();
+ mdcache->decode_replica_dir(dir, p, diri, oldauth, finished);
+ dout(7) << "on " << *dir << " (first pass)" << dendl;
+ } else {
+ if (it == import_state.end() ||
+ it->second.peer != oldauth ||
+ it->second.tid != m->get_tid()) {
+ dout(7) << "obsolete message, dropping" << dendl;
+ return;
+ }
+ ceph_assert(it->second.state == IMPORT_PREPPING);
+ ceph_assert(it->second.peer == oldauth);
+
+ dir = mdcache->get_dirfrag(m->get_dirfrag());
+ ceph_assert(dir);
+ dout(7) << "on " << *dir << " (subsequent pass)" << dendl;
+ diri = dir->get_inode();
+ }
+ ceph_assert(dir->is_auth() == false);
+
+ mdcache->show_subtrees();
+
+ // build import bound map
+ map<inodeno_t, fragset_t> import_bound_fragset;
+ for (const auto &bound : m->get_bounds()) {
+ dout(10) << " bound " << bound << dendl;
+ import_bound_fragset[bound.ino].insert_raw(bound.frag);
+ }
+ // assimilate contents?
+ if (!did_assim) {
+ dout(7) << "doing assim on " << *dir << dendl;
+
+ // change import state
+ it->second.state = IMPORT_PREPPING;
+ it->second.bound_ls = m->get_bounds();
+ it->second.bystanders = m->get_bystanders();
+ ceph_assert(g_conf()->mds_kill_import_at != 3);
+
+ // bystander list
+ dout(7) << "bystanders are " << it->second.bystanders << dendl;
+
+ // move pin to dir
+ diri->put(CInode::PIN_IMPORTING);
+ dir->get(CDir::PIN_IMPORTING);
+ dir->state_set(CDir::STATE_IMPORTING);
+
+ // assimilate traces to exports
+ // each trace is: df ('-' | ('f' dir | 'd') dentry inode (dir dentry inode)*)
+ for (const auto &bl : m->traces) {
+ auto blp = bl.cbegin();
+ decode_export_prep_trace(blp, oldauth, finished);
+ }
+
+ // make bound sticky
+ for (map<inodeno_t,fragset_t>::iterator p = import_bound_fragset.begin();
+ p != import_bound_fragset.end();
+ ++p) {
+ p->second.simplify();
+ CInode *in = mdcache->get_inode(p->first);
+ ceph_assert(in);
+ in->get_stickydirs();
+ dout(7) << " set stickydirs on bound inode " << *in << dendl;
+ }
+
+ } else {
+ dout(7) << " not doing assim on " << *dir << dendl;
+ }
+
+ MDSGatherBuilder gather(g_ceph_context);
+
+ if (!finished.empty())
+ mds->queue_waiters(finished);
+
+
+ bool success = true;
+ if (mds->is_active()) {
+ // open all bounds
+ set<CDir*> import_bounds;
+ for (map<inodeno_t,fragset_t>::iterator p = import_bound_fragset.begin();
+ p != import_bound_fragset.end();
+ ++p) {
+ CInode *in = mdcache->get_inode(p->first);
+ ceph_assert(in);
+
+ // map fragset into a frag_t list, based on the inode fragtree
+ frag_vec_t leaves;
+ for (const auto& frag : p->second) {
+ in->dirfragtree.get_leaves_under(frag, leaves);
+ }
+ dout(10) << " bound inode " << p->first << " fragset " << p->second << " maps to " << leaves << dendl;
+
+ for (const auto& leaf : leaves) {
+ CDir *bound = mdcache->get_dirfrag(dirfrag_t(p->first, leaf));
+ if (!bound) {
+ dout(7) << " opening bounding dirfrag " << leaf << " on " << *in << dendl;
+ mdcache->open_remote_dirfrag(in, leaf, gather.new_sub());
+ continue;
+ }
+
+ if (!bound->state_test(CDir::STATE_IMPORTBOUND)) {
+ dout(7) << " pinning import bound " << *bound << dendl;
+ bound->get(CDir::PIN_IMPORTBOUND);
+ bound->state_set(CDir::STATE_IMPORTBOUND);
+ } else {
+ dout(7) << " already pinned import bound " << *bound << dendl;
+ }
+ import_bounds.insert(bound);
+ }
+ }
+
+ if (gather.has_subs()) {
+ C_MDS_ExportPrepFactory cf(this, m);
+ gather.set_finisher(cf.build());
+ gather.activate();
+ return;
+ }
+
+ dout(7) << " all ready, noting auth and freezing import region" << dendl;
+
+ if (!mdcache->is_readonly() &&
+ // for pinning scatter gather. loner has a higher chance to get wrlock
+ diri->filelock.can_wrlock(diri->get_loner()) &&
+ diri->nestlock.can_wrlock(diri->get_loner())) {
+ it->second.mut = new MutationImpl();
+ // force some locks. hacky.
+ mds->locker->wrlock_force(&dir->inode->filelock, it->second.mut);
+ mds->locker->wrlock_force(&dir->inode->nestlock, it->second.mut);
+
+ // note that i am an ambiguous auth for this subtree.
+ // specify bounds, since the exporter explicitly defines the region.
+ mdcache->adjust_bounded_subtree_auth(dir, import_bounds,
+ pair<int,int>(oldauth, mds->get_nodeid()));
+ mdcache->verify_subtree_bounds(dir, import_bounds);
+ // freeze.
+ dir->_freeze_tree();
+ // note new state
+ it->second.state = IMPORT_PREPPED;
+ } else {
+ dout(7) << " couldn't acquire all needed locks, failing. " << *dir << dendl;
+ success = false;
+ }
+ } else {
+ dout(7) << " not active, failing. " << *dir << dendl;
+ success = false;
+ }
+
+ if (!success)
+ import_reverse_prepping(dir, it->second);
+
+ // ok!
+ dout(7) << " sending export_prep_ack on " << *dir << dendl;
+ mds->send_message(make_message<MExportDirPrepAck>(dir->dirfrag(), success, m->get_tid()), m->get_connection());
+
+ ceph_assert(g_conf()->mds_kill_import_at != 4);
+}
+
+
+
+
+class C_MDS_ImportDirLoggedStart : public MigratorLogContext {
+ dirfrag_t df;
+ CDir *dir;
+ mds_rank_t from;
+public:
+ map<client_t,pair<Session*,uint64_t> > imported_session_map;
+
+ C_MDS_ImportDirLoggedStart(Migrator *m, CDir *d, mds_rank_t f) :
+ MigratorLogContext(m), df(d->dirfrag()), dir(d), from(f) {
+ dir->get(CDir::PIN_PTRWAITER);
+ }
+ void finish(int r) override {
+ mig->import_logged_start(df, dir, from, imported_session_map);
+ dir->put(CDir::PIN_PTRWAITER);
+ }
+};
+
+void Migrator::handle_export_dir(const cref_t<MExportDir> &m)
+{
+ ceph_assert(g_conf()->mds_kill_import_at != 5);
+ CDir *dir = mdcache->get_dirfrag(m->dirfrag);
+ ceph_assert(dir);
+
+ mds_rank_t oldauth = mds_rank_t(m->get_source().num());
+ dout(7) << "importing " << *dir << " from " << oldauth << dendl;
+
+ ceph_assert(!dir->is_auth());
+ ceph_assert(dir->freeze_tree_state);
+
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(m->dirfrag);
+ ceph_assert(it != import_state.end());
+ ceph_assert(it->second.state == IMPORT_PREPPED);
+ ceph_assert(it->second.tid == m->get_tid());
+ ceph_assert(it->second.peer == oldauth);
+
+ if (!dir->get_inode()->dirfragtree.is_leaf(dir->get_frag()))
+ dir->get_inode()->dirfragtree.force_to_leaf(g_ceph_context, dir->get_frag());
+
+ mdcache->show_subtrees();
+
+ C_MDS_ImportDirLoggedStart *onlogged = new C_MDS_ImportDirLoggedStart(this, dir, oldauth);
+
+ // start the journal entry
+ EImportStart *le = new EImportStart(mds->mdlog, dir->dirfrag(), m->bounds, oldauth);
+ mds->mdlog->start_entry(le);
+
+ le->metablob.add_dir_context(dir);
+
+ // adjust auth (list us _first_)
+ mdcache->adjust_subtree_auth(dir, mds->get_nodeid(), oldauth);
+
+ // new client sessions, open these after we journal
+ // include imported sessions in EImportStart
+ auto cmp = m->client_map.cbegin();
+ map<client_t,entity_inst_t> client_map;
+ map<client_t,client_metadata_t> client_metadata_map;
+ decode(client_map, cmp);
+ decode(client_metadata_map, cmp);
+ ceph_assert(cmp.end());
+ le->cmapv = mds->server->prepare_force_open_sessions(client_map, client_metadata_map,
+ onlogged->imported_session_map);
+ encode(client_map, le->client_map, mds->mdsmap->get_up_features());
+ encode(client_metadata_map, le->client_map);
+
+ auto blp = m->export_data.cbegin();
+ int num_imported_inodes = 0;
+ while (!blp.end()) {
+ decode_import_dir(blp,
+ oldauth,
+ dir, // import root
+ le,
+ mds->mdlog->get_current_segment(),
+ it->second.peer_exports,
+ it->second.updated_scatterlocks,
+ num_imported_inodes);
+ }
+ dout(10) << " " << m->bounds.size() << " imported bounds" << dendl;
+
+ // include bounds in EImportStart
+ set<CDir*> import_bounds;
+ for (const auto &bound : m->bounds) {
+ CDir *bd = mdcache->get_dirfrag(bound);
+ ceph_assert(bd);
+ le->metablob.add_dir(bd, false); // note that parent metadata is already in the event
+ import_bounds.insert(bd);
+ }
+ mdcache->verify_subtree_bounds(dir, import_bounds);
+
+ // adjust popularity
+ mds->balancer->add_import(dir);
+
+ dout(7) << "did " << *dir << dendl;
+
+ // note state
+ it->second.state = IMPORT_LOGGINGSTART;
+ ceph_assert(g_conf()->mds_kill_import_at != 6);
+
+ // log it
+ mds->mdlog->submit_entry(le, onlogged);
+ mds->mdlog->flush();
+
+ // some stats
+ if (mds->logger) {
+ mds->logger->inc(l_mds_imported);
+ mds->logger->inc(l_mds_imported_inodes, num_imported_inodes);
+ }
+}
+
+
+/*
+ * this is an import helper
+ * called by import_finish, and import_reverse and friends.
+ */
+void Migrator::import_remove_pins(CDir *dir, set<CDir*>& bounds)
+{
+ import_state_t& stat = import_state[dir->dirfrag()];
+ // root
+ dir->put(CDir::PIN_IMPORTING);
+ dir->state_clear(CDir::STATE_IMPORTING);
+
+ // bounding inodes
+ set<inodeno_t> did;
+ for (list<dirfrag_t>::iterator p = stat.bound_ls.begin();
+ p != stat.bound_ls.end();
+ ++p) {
+ if (did.count(p->ino))
+ continue;
+ did.insert(p->ino);
+ CInode *in = mdcache->get_inode(p->ino);
+ ceph_assert(in);
+ in->put_stickydirs();
+ }
+
+ if (stat.state == IMPORT_PREPPING) {
+ for (auto bd : bounds) {
+ if (bd->state_test(CDir::STATE_IMPORTBOUND)) {
+ bd->put(CDir::PIN_IMPORTBOUND);
+ bd->state_clear(CDir::STATE_IMPORTBOUND);
+ }
+ }
+ } else if (stat.state >= IMPORT_PREPPED) {
+ // bounding dirfrags
+ for (auto bd : bounds) {
+ ceph_assert(bd->state_test(CDir::STATE_IMPORTBOUND));
+ bd->put(CDir::PIN_IMPORTBOUND);
+ bd->state_clear(CDir::STATE_IMPORTBOUND);
+ }
+ }
+}
+
+class C_MDC_QueueContexts : public MigratorContext {
+public:
+ MDSContext::vec contexts;
+ C_MDC_QueueContexts(Migrator *m) : MigratorContext(m) {}
+ void finish(int r) override {
+ // execute contexts immediately after 'this' context
+ get_mds()->queue_waiters_front(contexts);
+ }
+};
+
+/*
+ * note: this does teh full work of reversing and import and cleaning up
+ * state.
+ * called by both handle_mds_failure and by handle_resolve (if we are
+ * a survivor coping with an exporter failure+recovery).
+ */
+void Migrator::import_reverse(CDir *dir)
+{
+ dout(7) << *dir << dendl;
+
+ import_state_t& stat = import_state[dir->dirfrag()];
+ stat.state = IMPORT_ABORTING;
+
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ // remove pins
+ import_remove_pins(dir, bounds);
+
+ // update auth, with possible subtree merge.
+ ceph_assert(dir->is_subtree_root());
+ if (mds->is_resolve())
+ mdcache->trim_non_auth_subtree(dir);
+
+ mdcache->adjust_subtree_auth(dir, stat.peer);
+
+ auto fin = new C_MDC_QueueContexts(this);
+ if (!dir->get_inode()->is_auth() &&
+ !dir->get_inode()->has_subtree_root_dirfrag(mds->get_nodeid())) {
+ dir->get_inode()->clear_scatter_dirty();
+ // wake up scatter_nudge waiters
+ dir->get_inode()->take_waiting(CInode::WAIT_ANY_MASK, fin->contexts);
+ }
+
+ int num_dentries = 0;
+ // adjust auth bits.
+ std::deque<CDir*> q;
+ q.push_back(dir);
+ while (!q.empty()) {
+ CDir *cur = q.front();
+ q.pop_front();
+
+ // dir
+ cur->abort_import();
+
+ for (auto &p : *cur) {
+ CDentry *dn = p.second;
+
+ // dentry
+ dn->clear_auth();
+ dn->clear_replica_map();
+ dn->set_replica_nonce(CDentry::EXPORT_NONCE);
+ if (dn->is_dirty())
+ dn->mark_clean();
+
+ // inode?
+ if (dn->get_linkage()->is_primary()) {
+ CInode *in = dn->get_linkage()->get_inode();
+ in->state_clear(CInode::STATE_AUTH);
+ in->clear_replica_map();
+ in->set_replica_nonce(CInode::EXPORT_NONCE);
+ if (in->is_dirty())
+ in->mark_clean();
+ in->clear_dirty_rstat();
+ if (!in->has_subtree_root_dirfrag(mds->get_nodeid())) {
+ in->clear_scatter_dirty();
+ in->take_waiting(CInode::WAIT_ANY_MASK, fin->contexts);
+ }
+
+ in->clear_dirty_parent();
+
+ in->clear_clientwriteable();
+ in->state_clear(CInode::STATE_NEEDSRECOVER);
+
+ in->authlock.clear_gather();
+ in->linklock.clear_gather();
+ in->dirfragtreelock.clear_gather();
+ in->filelock.clear_gather();
+
+ in->clear_file_locks();
+
+ // non-bounding dir?
+ auto&& dfs = in->get_dirfrags();
+ for (const auto& dir : dfs) {
+ if (bounds.count(dir) == 0)
+ q.push_back(dir);
+ }
+ }
+
+ mdcache->touch_dentry_bottom(dn); // move dentry to tail of LRU
+ ++num_dentries;
+ }
+ }
+
+ dir->add_waiter(CDir::WAIT_UNFREEZE, fin);
+
+ if (stat.state == IMPORT_ACKING) {
+ // remove imported caps
+ for (map<CInode*,map<client_t,Capability::Export> >::iterator p = stat.peer_exports.begin();
+ p != stat.peer_exports.end();
+ ++p) {
+ CInode *in = p->first;
+ for (map<client_t,Capability::Export>::iterator q = p->second.begin();
+ q != p->second.end();
+ ++q) {
+ Capability *cap = in->get_client_cap(q->first);
+ if (!cap) {
+ ceph_assert(!stat.session_map.count(q->first));
+ continue;
+ }
+ if (cap->is_importing())
+ in->remove_client_cap(q->first);
+ else
+ cap->clear_clientwriteable();
+ }
+ in->put(CInode::PIN_IMPORTINGCAPS);
+ }
+ for (auto& p : stat.session_map) {
+ Session *session = p.second.first;
+ session->dec_importing();
+ }
+ }
+
+ // log our failure
+ mds->mdlog->start_submit_entry(new EImportFinish(dir, false)); // log failure
+
+ mdcache->trim(num_dentries); // try trimming dentries
+
+ // notify bystanders; wait in aborting state
+ import_notify_abort(dir, bounds);
+}
+
+void Migrator::import_notify_finish(CDir *dir, set<CDir*>& bounds)
+{
+ dout(7) << *dir << dendl;
+
+ import_state_t& stat = import_state[dir->dirfrag()];
+ for (set<mds_rank_t>::iterator p = stat.bystanders.begin();
+ p != stat.bystanders.end();
+ ++p) {
+ auto notify = make_message<MExportDirNotify>(dir->dirfrag(), stat.tid, false,
+ pair<int,int>(stat.peer, mds->get_nodeid()),
+ pair<int,int>(mds->get_nodeid(), CDIR_AUTH_UNKNOWN));
+ for (set<CDir*>::iterator i = bounds.begin(); i != bounds.end(); ++i)
+ notify->get_bounds().push_back((*i)->dirfrag());
+ mds->send_message_mds(notify, *p);
+ }
+}
+
+void Migrator::import_notify_abort(CDir *dir, set<CDir*>& bounds)
+{
+ dout(7) << *dir << dendl;
+
+ import_state_t& stat = import_state[dir->dirfrag()];
+ for (set<mds_rank_t>::iterator p = stat.bystanders.begin();
+ p != stat.bystanders.end(); ) {
+ if (mds->is_cluster_degraded() &&
+ !mds->mdsmap->is_clientreplay_or_active_or_stopping(*p)) {
+ // this can happen if both exporter and bystander fail in the same mdsmap epoch
+ stat.bystanders.erase(p++);
+ continue;
+ }
+ auto notify = make_message<MExportDirNotify>(dir->dirfrag(), stat.tid, true,
+ mds_authority_t(stat.peer, mds->get_nodeid()),
+ mds_authority_t(stat.peer, CDIR_AUTH_UNKNOWN));
+ for (set<CDir*>::iterator i = bounds.begin(); i != bounds.end(); ++i)
+ notify->get_bounds().push_back((*i)->dirfrag());
+ mds->send_message_mds(notify, *p);
+ ++p;
+ }
+ if (stat.bystanders.empty()) {
+ dout(7) << "no bystanders, finishing reverse now" << dendl;
+ import_reverse_unfreeze(dir);
+ } else {
+ ceph_assert(g_conf()->mds_kill_import_at != 10);
+ }
+}
+
+void Migrator::import_reverse_unfreeze(CDir *dir)
+{
+ dout(7) << *dir << dendl;
+ ceph_assert(!dir->is_auth());
+ mdcache->discard_delayed_expire(dir);
+ dir->unfreeze_tree();
+ if (dir->is_subtree_root())
+ mdcache->try_subtree_merge(dir);
+ import_reverse_final(dir);
+}
+
+void Migrator::import_reverse_final(CDir *dir)
+{
+ dout(7) << *dir << dendl;
+
+ // clean up
+ map<dirfrag_t, import_state_t>::iterator it = import_state.find(dir->dirfrag());
+ ceph_assert(it != import_state.end());
+
+ MutationRef mut = it->second.mut;
+ import_state.erase(it);
+
+ // send pending import_maps?
+ mdcache->maybe_send_pending_resolves();
+
+ if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ mdcache->show_subtrees();
+ //audit(); // this fails, bc we munge up the subtree map during handle_import_map (resolve phase)
+}
+
+
+
+
+void Migrator::import_logged_start(dirfrag_t df, CDir *dir, mds_rank_t from,
+ map<client_t,pair<Session*,uint64_t> >& imported_session_map)
+{
+ dout(7) << *dir << dendl;
+
+ map<dirfrag_t, import_state_t>::iterator it = import_state.find(dir->dirfrag());
+ if (it == import_state.end() ||
+ it->second.state != IMPORT_LOGGINGSTART) {
+ dout(7) << "import " << df << " must have aborted" << dendl;
+ mds->server->finish_force_open_sessions(imported_session_map);
+ return;
+ }
+
+ // note state
+ it->second.state = IMPORT_ACKING;
+
+ ceph_assert(g_conf()->mds_kill_import_at != 7);
+
+ // force open client sessions and finish cap import
+ mds->server->finish_force_open_sessions(imported_session_map, false);
+
+ map<inodeno_t,map<client_t,Capability::Import> > imported_caps;
+ for (map<CInode*, map<client_t,Capability::Export> >::iterator p = it->second.peer_exports.begin();
+ p != it->second.peer_exports.end();
+ ++p) {
+ // parameter 'peer' is NONE, delay sending cap import messages to client
+ finish_import_inode_caps(p->first, MDS_RANK_NONE, true, imported_session_map,
+ p->second, imported_caps[p->first->ino()]);
+ }
+
+ it->second.session_map.swap(imported_session_map);
+
+ // send notify's etc.
+ dout(7) << "sending ack for " << *dir << " to old auth mds." << from << dendl;
+
+ // test surviving observer of a failed migration that did not complete
+ //assert(dir->replica_map.size() < 2 || mds->get_nodeid() != 0);
+
+ auto ack = make_message<MExportDirAck>(dir->dirfrag(), it->second.tid);
+ encode(imported_caps, ack->imported_caps);
+
+ mds->send_message_mds(ack, from);
+ ceph_assert(g_conf()->mds_kill_import_at != 8);
+
+ mdcache->show_subtrees();
+}
+
+void Migrator::handle_export_finish(const cref_t<MExportDirFinish> &m)
+{
+ CDir *dir = mdcache->get_dirfrag(m->get_dirfrag());
+ ceph_assert(dir);
+ dout(7) << *dir << (m->is_last() ? " last" : "") << dendl;
+
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(m->get_dirfrag());
+ ceph_assert(it != import_state.end());
+ ceph_assert(it->second.tid == m->get_tid());
+
+ import_finish(dir, false, m->is_last());
+}
+
+void Migrator::import_finish(CDir *dir, bool notify, bool last)
+{
+ dout(7) << *dir << dendl;
+
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(dir->dirfrag());
+ ceph_assert(it != import_state.end());
+ ceph_assert(it->second.state == IMPORT_ACKING || it->second.state == IMPORT_FINISHING);
+
+ if (it->second.state == IMPORT_ACKING) {
+ ceph_assert(dir->is_auth());
+ mdcache->adjust_subtree_auth(dir, mds->get_nodeid(), mds->get_nodeid());
+ }
+
+ // log finish
+ ceph_assert(g_conf()->mds_kill_import_at != 9);
+
+ if (it->second.state == IMPORT_ACKING) {
+ for (map<CInode*, map<client_t,Capability::Export> >::iterator p = it->second.peer_exports.begin();
+ p != it->second.peer_exports.end();
+ ++p) {
+ CInode *in = p->first;
+ ceph_assert(in->is_auth());
+ for (map<client_t,Capability::Export>::iterator q = p->second.begin();
+ q != p->second.end();
+ ++q) {
+ auto r = it->second.session_map.find(q->first);
+ if (r == it->second.session_map.end())
+ continue;
+
+ Session *session = r->second.first;
+ Capability *cap = in->get_client_cap(q->first);
+ ceph_assert(cap);
+ cap->merge(q->second, true);
+ cap->clear_importing();
+ mdcache->do_cap_import(session, in, cap, q->second.cap_id, q->second.seq,
+ q->second.mseq - 1, it->second.peer, CEPH_CAP_FLAG_AUTH);
+ }
+ p->second.clear();
+ in->replica_caps_wanted = 0;
+ }
+ for (auto& p : it->second.session_map) {
+ Session *session = p.second.first;
+ session->dec_importing();
+ }
+ }
+
+ if (!last) {
+ ceph_assert(it->second.state == IMPORT_ACKING);
+ it->second.state = IMPORT_FINISHING;
+ return;
+ }
+
+ // remove pins
+ set<CDir*> bounds;
+ mdcache->get_subtree_bounds(dir, bounds);
+
+ if (notify)
+ import_notify_finish(dir, bounds);
+
+ import_remove_pins(dir, bounds);
+
+ map<CInode*, map<client_t,Capability::Export> > peer_exports;
+ it->second.peer_exports.swap(peer_exports);
+
+ // clear import state (we're done!)
+ MutationRef mut = it->second.mut;
+ import_state.erase(it);
+
+ mds->mdlog->start_submit_entry(new EImportFinish(dir, true));
+
+ // process delayed expires
+ mdcache->process_delayed_expire(dir);
+
+ // unfreeze tree, with possible subtree merge.
+ dir->unfreeze_tree();
+ mdcache->try_subtree_merge(dir);
+
+ mdcache->show_subtrees();
+ //audit(); // this fails, bc we munge up the subtree map during handle_import_map (resolve phase)
+
+ if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ // re-eval imported caps
+ for (map<CInode*, map<client_t,Capability::Export> >::iterator p = peer_exports.begin();
+ p != peer_exports.end();
+ ++p) {
+ if (p->first->is_auth())
+ mds->locker->eval(p->first, CEPH_CAP_LOCKS, true);
+ p->first->put(CInode::PIN_IMPORTINGCAPS);
+ }
+
+ // send pending import_maps?
+ mdcache->maybe_send_pending_resolves();
+
+ // did i just import mydir?
+ if (dir->ino() == MDS_INO_MDSDIR(mds->get_nodeid()))
+ mdcache->populate_mydir();
+
+ // is it empty?
+ if (dir->get_num_head_items() == 0 &&
+ !dir->inode->is_auth()) {
+ // reexport!
+ export_empty_import(dir);
+ }
+}
+
+void Migrator::decode_import_inode(CDentry *dn, bufferlist::const_iterator& blp,
+ mds_rank_t oldauth, LogSegment *ls,
+ map<CInode*, map<client_t,Capability::Export> >& peer_exports,
+ list<ScatterLock*>& updated_scatterlocks)
+{
+ CInode *in;
+ bool added = false;
+ DECODE_START(1, blp);
+ dout(15) << " on " << *dn << dendl;
+
+ inodeno_t ino;
+ snapid_t last;
+ decode(ino, blp);
+ decode(last, blp);
+
+ in = mdcache->get_inode(ino, last);
+ if (!in) {
+ in = new CInode(mds->mdcache, true, 2, last);
+ added = true;
+ }
+
+ // state after link -- or not! -sage
+ in->decode_import(blp, ls); // cap imports are noted for later action
+
+ // caps
+ decode_import_inode_caps(in, true, blp, peer_exports);
+
+ DECODE_FINISH(blp);
+
+ // link before state -- or not! -sage
+ if (dn->get_linkage()->get_inode() != in) {
+ ceph_assert(!dn->get_linkage()->get_inode());
+ dn->dir->link_primary_inode(dn, in);
+ }
+
+ if (in->is_dir())
+ dn->dir->pop_lru_subdirs.push_back(&in->item_pop_lru);
+
+ // add inode?
+ if (added) {
+ mdcache->add_inode(in);
+ dout(10) << "added " << *in << dendl;
+ } else {
+ dout(10) << " had " << *in << dendl;
+ }
+
+ if (in->get_inode()->is_dirty_rstat())
+ in->mark_dirty_rstat();
+
+ if (!in->get_inode()->client_ranges.empty())
+ in->mark_clientwriteable();
+
+ // clear if dirtyscattered, since we're going to journal this
+ // but not until we _actually_ finish the import...
+ if (in->filelock.is_dirty()) {
+ updated_scatterlocks.push_back(&in->filelock);
+ mds->locker->mark_updated_scatterlock(&in->filelock);
+ }
+
+ if (in->dirfragtreelock.is_dirty()) {
+ updated_scatterlocks.push_back(&in->dirfragtreelock);
+ mds->locker->mark_updated_scatterlock(&in->dirfragtreelock);
+ }
+
+ // adjust replica list
+ //assert(!in->is_replica(oldauth)); // not true on failed export
+ in->add_replica(oldauth, CInode::EXPORT_NONCE);
+ if (in->is_replica(mds->get_nodeid()))
+ in->remove_replica(mds->get_nodeid());
+
+ if (in->snaplock.is_stable() &&
+ in->snaplock.get_state() != LOCK_SYNC)
+ mds->locker->try_eval(&in->snaplock, NULL);
+
+ if (in->policylock.is_stable() &&
+ in->policylock.get_state() != LOCK_SYNC)
+ mds->locker->try_eval(&in->policylock, NULL);
+}
+
+void Migrator::decode_import_inode_caps(CInode *in, bool auth_cap,
+ bufferlist::const_iterator &blp,
+ map<CInode*, map<client_t,Capability::Export> >& peer_exports)
+{
+ DECODE_START(1, blp);
+ map<client_t,Capability::Export> cap_map;
+ decode(cap_map, blp);
+ if (auth_cap) {
+ mempool::mds_co::compact_map<int32_t,int32_t> mds_wanted;
+ decode(mds_wanted, blp);
+ mds_wanted.erase(mds->get_nodeid());
+ in->set_mds_caps_wanted(mds_wanted);
+ }
+ if (!cap_map.empty() ||
+ (auth_cap && (in->get_caps_wanted() & ~CEPH_CAP_PIN))) {
+ peer_exports[in].swap(cap_map);
+ in->get(CInode::PIN_IMPORTINGCAPS);
+ }
+ DECODE_FINISH(blp);
+}
+
+void Migrator::finish_import_inode_caps(CInode *in, mds_rank_t peer, bool auth_cap,
+ const map<client_t,pair<Session*,uint64_t> >& session_map,
+ const map<client_t,Capability::Export> &export_map,
+ map<client_t,Capability::Import> &import_map)
+{
+ const auto& client_ranges = in->get_projected_inode()->client_ranges;
+ auto r = client_ranges.cbegin();
+ bool needs_recover = false;
+
+ for (auto& it : export_map) {
+ dout(10) << "for client." << it.first << " on " << *in << dendl;
+
+ auto p = session_map.find(it.first);
+ if (p == session_map.end()) {
+ dout(10) << " no session for client." << it.first << dendl;
+ (void)import_map[it.first];
+ continue;
+ }
+
+ Session *session = p->second.first;
+
+ Capability *cap = in->get_client_cap(it.first);
+ if (!cap) {
+ cap = in->add_client_cap(it.first, session);
+ if (peer < 0)
+ cap->mark_importing();
+ }
+
+ if (auth_cap) {
+ while (r != client_ranges.cend() && r->first < it.first) {
+ needs_recover = true;
+ ++r;
+ }
+ if (r != client_ranges.cend() && r->first == it.first) {
+ cap->mark_clientwriteable();
+ ++r;
+ }
+ }
+
+ // Always ask exporter mds to send cap export messages for auth caps.
+ // For non-auth caps, ask exporter mds to send cap export messages to
+ // clients who haven't opened sessions. The cap export messages will
+ // make clients open sessions.
+ if (auth_cap || !session->get_connection()) {
+ Capability::Import& im = import_map[it.first];
+ im.cap_id = cap->get_cap_id();
+ im.mseq = auth_cap ? it.second.mseq : cap->get_mseq();
+ im.issue_seq = cap->get_last_seq() + 1;
+ }
+
+ if (peer >= 0) {
+ cap->merge(it.second, auth_cap);
+ mdcache->do_cap_import(session, in, cap, it.second.cap_id,
+ it.second.seq, it.second.mseq - 1, peer,
+ auth_cap ? CEPH_CAP_FLAG_AUTH : CEPH_CAP_FLAG_RELEASE);
+ }
+ }
+
+ if (auth_cap) {
+ if (r != client_ranges.cend())
+ needs_recover = true;
+ if (needs_recover)
+ in->state_set(CInode::STATE_NEEDSRECOVER);
+ }
+
+ if (peer >= 0) {
+ in->replica_caps_wanted = 0;
+ in->put(CInode::PIN_IMPORTINGCAPS);
+ }
+}
+
+void Migrator::decode_import_dir(bufferlist::const_iterator& blp,
+ mds_rank_t oldauth,
+ CDir *import_root,
+ EImportStart *le,
+ LogSegment *ls,
+ map<CInode*,map<client_t,Capability::Export> >& peer_exports,
+ list<ScatterLock*>& updated_scatterlocks, int &num_imported)
+{
+ DECODE_START(1, blp);
+ // set up dir
+ dirfrag_t df;
+ decode(df, blp);
+
+ CInode *diri = mdcache->get_inode(df.ino);
+ ceph_assert(diri);
+ CDir *dir = diri->get_or_open_dirfrag(mds->mdcache, df.frag);
+ ceph_assert(dir);
+
+ dout(7) << *dir << dendl;
+
+ if (!dir->freeze_tree_state) {
+ ceph_assert(dir->get_version() == 0);
+ dir->freeze_tree_state = import_root->freeze_tree_state;
+ }
+
+ // assimilate state
+ dir->decode_import(blp, ls);
+
+ // adjust replica list
+ //assert(!dir->is_replica(oldauth)); // not true on failed export
+ dir->add_replica(oldauth, CDir::EXPORT_NONCE);
+ if (dir->is_replica(mds->get_nodeid()))
+ dir->remove_replica(mds->get_nodeid());
+
+ // add to journal entry
+ if (le)
+ le->metablob.add_import_dir(dir);
+
+ // take all waiters on this dir
+ // NOTE: a pass of imported data is guaranteed to get all of my waiters because
+ // a replica's presense in my cache implies/forces it's presense in authority's.
+ MDSContext::vec waiters;
+ dir->take_waiting(CDir::WAIT_ANY_MASK, waiters);
+ for (auto c : waiters)
+ dir->add_waiter(CDir::WAIT_UNFREEZE, c); // UNFREEZE will get kicked both on success or failure
+
+ dout(15) << "doing contents" << dendl;
+
+ // contents
+ __u32 nden;
+ decode(nden, blp);
+
+ for (; nden>0; nden--) {
+ num_imported++;
+
+ // dentry
+ string dname;
+ snapid_t last;
+ decode(dname, blp);
+ decode(last, blp);
+
+ CDentry *dn = dir->lookup_exact_snap(dname, last);
+ if (!dn)
+ dn = dir->add_null_dentry(dname, 1, last);
+
+ dn->decode_import(blp, ls);
+
+ dn->add_replica(oldauth, CDentry::EXPORT_NONCE);
+ if (dn->is_replica(mds->get_nodeid()))
+ dn->remove_replica(mds->get_nodeid());
+
+ // dentry lock in unreadable state can block path traverse
+ if (dn->lock.get_state() != LOCK_SYNC)
+ mds->locker->try_eval(&dn->lock, NULL);
+
+ dout(15) << " got " << *dn << dendl;
+
+ // points to...
+ char icode;
+ decode(icode, blp);
+
+ if (icode == 'N') {
+ // null dentry
+ ceph_assert(dn->get_linkage()->is_null());
+
+ // fall thru
+ }
+ else if (icode == 'L' || icode == 'l') {
+ // remote link
+ inodeno_t ino;
+ unsigned char d_type;
+ mempool::mds_co::string alternate_name;
+
+ CDentry::decode_remote(icode, ino, d_type, alternate_name, blp);
+
+ if (dn->get_linkage()->is_remote()) {
+ ceph_assert(dn->get_linkage()->get_remote_ino() == ino);
+ ceph_assert(dn->get_alternate_name() == alternate_name);
+ } else {
+ dir->link_remote_inode(dn, ino, d_type);
+ dn->set_alternate_name(std::move(alternate_name));
+ }
+ }
+ else if (icode == 'I' || icode == 'i') {
+ // inode
+ ceph_assert(le);
+ if (icode == 'i') {
+ DECODE_START(2, blp);
+ decode_import_inode(dn, blp, oldauth, ls,
+ peer_exports, updated_scatterlocks);
+ ceph_assert(!dn->is_projected());
+ decode(dn->alternate_name, blp);
+ DECODE_FINISH(blp);
+ } else {
+ decode_import_inode(dn, blp, oldauth, ls,
+ peer_exports, updated_scatterlocks);
+ }
+ }
+
+ // add dentry to journal entry
+ if (le)
+ le->metablob.add_import_dentry(dn);
+ }
+
+#ifdef MDS_VERIFY_FRAGSTAT
+ if (dir->is_complete())
+ dir->verify_fragstat();
+#endif
+
+ dir->inode->maybe_export_pin();
+
+ dout(7) << " done " << *dir << dendl;
+ DECODE_FINISH(blp);
+}
+
+
+
+
+
+// authority bystander
+
+void Migrator::handle_export_notify(const cref_t<MExportDirNotify> &m)
+{
+ if (!(mds->is_clientreplay() || mds->is_active() || mds->is_stopping())) {
+ return;
+ }
+
+ CDir *dir = mdcache->get_dirfrag(m->get_dirfrag());
+
+ mds_rank_t from = mds_rank_t(m->get_source().num());
+ mds_authority_t old_auth = m->get_old_auth();
+ mds_authority_t new_auth = m->get_new_auth();
+
+ if (!dir) {
+ dout(7) << old_auth << " -> " << new_auth
+ << " on missing dir " << m->get_dirfrag() << dendl;
+ } else if (dir->authority() != old_auth) {
+ dout(7) << "old_auth was " << dir->authority()
+ << " != " << old_auth << " -> " << new_auth
+ << " on " << *dir << dendl;
+ } else {
+ dout(7) << old_auth << " -> " << new_auth
+ << " on " << *dir << dendl;
+ // adjust auth
+ set<CDir*> have;
+ mdcache->map_dirfrag_set(m->get_bounds(), have);
+ mdcache->adjust_bounded_subtree_auth(dir, have, new_auth);
+
+ // induce a merge?
+ mdcache->try_subtree_merge(dir);
+ }
+
+ // send ack
+ if (m->wants_ack()) {
+ mds->send_message_mds(make_message<MExportDirNotifyAck>(m->get_dirfrag(), m->get_tid(), m->get_new_auth()), from);
+ } else {
+ // aborted. no ack.
+ dout(7) << "no ack requested" << dendl;
+ }
+}
+
+/** cap exports **/
+void Migrator::export_caps(CInode *in)
+{
+ mds_rank_t dest = in->authority().first;
+ dout(7) << "to mds." << dest << " " << *in << dendl;
+
+ ceph_assert(in->is_any_caps());
+ ceph_assert(!in->is_auth());
+ ceph_assert(!in->is_ambiguous_auth());
+ ceph_assert(!in->state_test(CInode::STATE_EXPORTINGCAPS));
+
+ auto ex = make_message<MExportCaps>();
+ ex->ino = in->ino();
+
+ encode_export_inode_caps(in, false, ex->cap_bl, ex->client_map, ex->client_metadata_map);
+
+ mds->send_message_mds(ex, dest);
+}
+
+void Migrator::handle_export_caps_ack(const cref_t<MExportCapsAck> &ack)
+{
+ mds_rank_t from = ack->get_source().num();
+ CInode *in = mdcache->get_inode(ack->ino);
+ if (in) {
+ ceph_assert(!in->is_auth());
+
+ dout(10) << *ack << " from "
+ << ack->get_source() << " on " << *in << dendl;
+
+ map<client_t,Capability::Import> imported_caps;
+ map<client_t,uint64_t> caps_ids;
+ auto blp = ack->cap_bl.cbegin();
+ decode(imported_caps, blp);
+ decode(caps_ids, blp);
+
+ for (auto& it : imported_caps) {
+ Capability *cap = in->get_client_cap(it.first);
+ if (!cap || cap->get_cap_id() != caps_ids.at(it.first))
+ continue;
+
+ dout(7) << " telling client." << it.first
+ << " exported caps on " << *in << dendl;
+ auto m = make_message<MClientCaps>(CEPH_CAP_OP_EXPORT, in->ino(), 0,
+ cap->get_cap_id(), cap->get_mseq(),
+ mds->get_osd_epoch_barrier());
+ m->set_cap_peer(it.second.cap_id, it.second.issue_seq, it.second.mseq, from, 0);
+ mds->send_message_client_counted(m, it.first);
+
+ in->remove_client_cap(it.first);
+ }
+
+ mds->locker->request_inode_file_caps(in);
+ mds->locker->try_eval(in, CEPH_CAP_LOCKS);
+ }
+}
+
+void Migrator::handle_gather_caps(const cref_t<MGatherCaps> &m)
+{
+ CInode *in = mdcache->get_inode(m->ino);
+ if (!in)
+ return;
+
+ dout(10) << *m << " from " << m->get_source()
+ << " on " << *in << dendl;
+
+ if (in->is_any_caps() &&
+ !in->is_auth() &&
+ !in->is_ambiguous_auth() &&
+ !in->state_test(CInode::STATE_EXPORTINGCAPS))
+ export_caps(in);
+}
+
+class C_M_LoggedImportCaps : public MigratorLogContext {
+ CInode *in;
+ mds_rank_t from;
+public:
+ map<client_t,pair<Session*,uint64_t> > imported_session_map;
+ map<CInode*, map<client_t,Capability::Export> > peer_exports;
+
+ C_M_LoggedImportCaps(Migrator *m, CInode *i, mds_rank_t f) : MigratorLogContext(m), in(i), from(f) {}
+ void finish(int r) override {
+ mig->logged_import_caps(in, from, imported_session_map, peer_exports);
+ }
+};
+
+void Migrator::handle_export_caps(const cref_t<MExportCaps> &ex)
+{
+ dout(10) << *ex << " from " << ex->get_source() << dendl;
+ CInode *in = mdcache->get_inode(ex->ino);
+
+ ceph_assert(in);
+ ceph_assert(in->is_auth());
+
+ // FIXME
+ if (!in->can_auth_pin()) {
+ return;
+ }
+
+ in->auth_pin(this);
+
+ map<client_t,entity_inst_t> client_map{ex->client_map};
+ map<client_t,client_metadata_t> client_metadata_map{ex->client_metadata_map};
+
+ C_M_LoggedImportCaps *finish = new C_M_LoggedImportCaps(
+ this, in, mds_rank_t(ex->get_source().num()));
+
+ version_t pv = mds->server->prepare_force_open_sessions(client_map, client_metadata_map,
+ finish->imported_session_map);
+ // decode new caps
+ auto blp = ex->cap_bl.cbegin();
+ decode_import_inode_caps(in, false, blp, finish->peer_exports);
+ ceph_assert(!finish->peer_exports.empty()); // thus, inode is pinned.
+
+ // journal open client sessions
+ ESessions *le = new ESessions(pv, std::move(client_map),
+ std::move(client_metadata_map));
+ mds->mdlog->start_submit_entry(le, finish);
+ mds->mdlog->flush();
+}
+
+
+void Migrator::logged_import_caps(CInode *in,
+ mds_rank_t from,
+ map<client_t,pair<Session*,uint64_t> >& imported_session_map,
+ map<CInode*, map<client_t,Capability::Export> >& peer_exports)
+{
+ dout(10) << *in << dendl;
+ // see export_go() vs export_go_synced()
+ ceph_assert(in->is_auth());
+
+ // force open client sessions and finish cap import
+ mds->server->finish_force_open_sessions(imported_session_map);
+
+ auto it = peer_exports.find(in);
+ ceph_assert(it != peer_exports.end());
+
+ // clients will release caps from the exporter when they receive the cap import message.
+ map<client_t,Capability::Import> imported_caps;
+ finish_import_inode_caps(in, from, false, imported_session_map, it->second, imported_caps);
+ mds->locker->eval(in, CEPH_CAP_LOCKS, true);
+
+ if (!imported_caps.empty()) {
+ auto ack = make_message<MExportCapsAck>(in->ino());
+ map<client_t,uint64_t> peer_caps_ids;
+ for (auto &p : imported_caps )
+ peer_caps_ids[p.first] = it->second.at(p.first).cap_id;
+
+ encode(imported_caps, ack->cap_bl);
+ encode(peer_caps_ids, ack->cap_bl);
+ mds->send_message_mds(ack, from);
+ }
+
+ in->auth_unpin(this);
+}
+
+Migrator::Migrator(MDSRank *m, MDCache *c) : mds(m), mdcache(c) {
+ max_export_size = g_conf().get_val<Option::size_t>("mds_max_export_size");
+ inject_session_race = g_conf().get_val<bool>("mds_inject_migrator_session_race");
+}
+
+void Migrator::handle_conf_change(const std::set<std::string>& changed, const MDSMap& mds_map)
+{
+ if (changed.count("mds_max_export_size"))
+ max_export_size = g_conf().get_val<Option::size_t>("mds_max_export_size");
+ if (changed.count("mds_inject_migrator_session_race")) {
+ inject_session_race = g_conf().get_val<bool>("mds_inject_migrator_session_race");
+ dout(0) << "mds_inject_migrator_session_race is " << inject_session_race << dendl;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 12:48:20 +0000