--- /dev/null
+// -*- 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 "events/EExport.h"
+#include "events/EImportStart.h"
+#include "events/EImportFinish.h"
+#include "events/ESessions.h"
+
+#include "msg/Messenger.h"
+
+#include "messages/MClientCaps.h"
+
+#include "messages/MExportDirDiscover.h"
+#include "messages/MExportDirDiscoverAck.h"
+#include "messages/MExportDirCancel.h"
+#include "messages/MExportDirPrep.h"
+#include "messages/MExportDirPrepAck.h"
+#include "messages/MExportDir.h"
+#include "messages/MExportDirAck.h"
+#include "messages/MExportDirNotify.h"
+#include "messages/MExportDirNotifyAck.h"
+#include "messages/MExportDirFinish.h"
+
+#include "messages/MExportCaps.h"
+#include "messages/MExportCapsAck.h"
+#include "messages/MGatherCaps.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() << ".migrator "
+
+
+class MigratorContext : public MDSInternalContextBase {
+protected:
+ Migrator *mig;
+ MDSRank *get_mds() override {
+ return mig->mds;
+ }
+public:
+ explicit MigratorContext(Migrator *mig_) : mig(mig_) {
+ assert(mig != NULL);
+ }
+};
+
+class MigratorLogContext : public MDSLogContextBase {
+protected:
+ Migrator *mig;
+ MDSRank *get_mds() override {
+ return mig->mds;
+ }
+public:
+ explicit MigratorLogContext(Migrator *mig_) : mig(mig_) {
+ assert(mig != NULL);
+ }
+};
+
+/* This function DOES put the passed message before returning*/
+void Migrator::dispatch(Message *m)
+{
+ switch (m->get_type()) {
+ // import
+ case MSG_MDS_EXPORTDIRDISCOVER:
+ handle_export_discover(static_cast<MExportDirDiscover*>(m));
+ break;
+ case MSG_MDS_EXPORTDIRPREP:
+ handle_export_prep(static_cast<MExportDirPrep*>(m));
+ break;
+ case MSG_MDS_EXPORTDIR:
+ handle_export_dir(static_cast<MExportDir*>(m));
+ break;
+ case MSG_MDS_EXPORTDIRFINISH:
+ handle_export_finish(static_cast<MExportDirFinish*>(m));
+ break;
+ case MSG_MDS_EXPORTDIRCANCEL:
+ handle_export_cancel(static_cast<MExportDirCancel*>(m));
+ break;
+
+ // export
+ case MSG_MDS_EXPORTDIRDISCOVERACK:
+ handle_export_discover_ack(static_cast<MExportDirDiscoverAck*>(m));
+ break;
+ case MSG_MDS_EXPORTDIRPREPACK:
+ handle_export_prep_ack(static_cast<MExportDirPrepAck*>(m));
+ break;
+ case MSG_MDS_EXPORTDIRACK:
+ handle_export_ack(static_cast<MExportDirAck*>(m));
+ break;
+ case MSG_MDS_EXPORTDIRNOTIFYACK:
+ handle_export_notify_ack(static_cast<MExportDirNotifyAck*>(m));
+ break;
+
+ // export 3rd party (dir_auth adjustments)
+ case MSG_MDS_EXPORTDIRNOTIFY:
+ handle_export_notify(static_cast<MExportDirNotify*>(m));
+ break;
+
+ // caps
+ case MSG_MDS_EXPORTCAPS:
+ handle_export_caps(static_cast<MExportCaps*>(m));
+ break;
+ case MSG_MDS_GATHERCAPS:
+ handle_gather_caps(static_cast<MGatherCaps*>(m));
+ break;
+
+ default:
+ derr << "migrator unknown message " << m->get_type() << dendl;
+ assert(0 == "migrator unknown message");
+ }
+}
+
+
+class C_MDC_EmptyImport : public MigratorContext {
+ CDir *dir;
+public:
+ C_MDC_EmptyImport(Migrator *m, CDir *d) : MigratorContext(m), dir(d) {}
+ void finish(int r) override {
+ mig->export_empty_import(dir);
+ }
+};
+
+
+void Migrator::export_empty_import(CDir *dir)
+{
+ dout(7) << "export_empty_import " << *dir << dendl;
+ 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;
+ if (stat.last_cum_auth_pins != dir->get_cum_auth_pins()) {
+ stat.last_cum_auth_pins = dir->get_cum_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) << "export_try_cancel " << *dir << dendl;
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ 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;
+ 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(new 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())
+ cache->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(new 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;
+ cache->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, bounds);
+ // process delayed expires
+ cache->process_delayed_expire(dir);
+ }
+ }
+ dir->unfreeze_tree();
+ cache->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(new 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);
+ 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_state.erase(it);
+ dir->state_clear(CDir::STATE_EXPORTING);
+ // send pending import_maps?
+ cache->maybe_send_pending_resolves();
+ }
+
+ // drop locks
+ if (state == EXPORT_LOCKING || state == EXPORT_DISCOVERING) {
+ MDRequestRef mdr = static_cast<MDRequestImpl*>(mut.get());
+ assert(mdr);
+ if (mdr->more()->waiting_on_slave.empty())
+ mds->mdcache->request_finish(mdr);
+ } else if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ cache->show_subtrees();
+
+ maybe_do_queued_export();
+ }
+}
+
+void Migrator::export_cancel_finish(CDir *dir)
+{
+ assert(dir->state_test(CDir::STATE_EXPORTING));
+ dir->state_clear(CDir::STATE_EXPORTING);
+
+ // pinned by Migrator::export_notify_abort()
+ dir->auth_unpin(this);
+ // send pending import_maps? (these need to go out when all exports have finished.)
+ cache->maybe_send_pending_resolves();
+}
+
+// ==========================================================
+// mds failure handling
+
+void Migrator::handle_mds_failure_or_stop(mds_rank_t who)
+{
+ dout(5) << "handle_mds_failure_or_stop mds." << 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.
+ list<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_state.erase(p);
+ export_cancel_finish(dir);
+ }
+ }
+ }
+ }
+
+ // 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 = mds->mdcache->get_inode(df.ino);
+ CDir *dir = mds->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:
+ assert(diri);
+ dout(10) << "import state=discovered : unpinning inode " << *diri << dendl;
+ import_reverse_discovered(df, diri);
+ break;
+
+ case IMPORT_PREPPING:
+ assert(dir);
+ dout(10) << "import state=prepping : unpinning base+bounds " << *dir << dendl;
+ import_reverse_prepping(dir);
+ break;
+
+ case IMPORT_PREPPED:
+ assert(dir);
+ dout(10) << "import state=prepped : unpinning base+bounds, unfreezing " << *dir << dendl;
+ {
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+ import_remove_pins(dir, bounds);
+
+ // adjust auth back to the exporter
+ cache->adjust_subtree_auth(dir, q->second.peer);
+
+ // notify bystanders ; wait in aborting state
+ import_state[df].state = IMPORT_ABORTING;
+ import_notify_abort(dir, bounds);
+ assert(g_conf->mds_kill_import_at != 10);
+ }
+ break;
+
+ case IMPORT_LOGGINGSTART:
+ assert(dir);
+ dout(10) << "import state=loggingstart : reversing import on " << *dir << dendl;
+ import_reverse(dir);
+ break;
+
+ case IMPORT_ACKING:
+ 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;
+ cache->get_subtree_bounds(dir, bounds);
+ cache->add_ambiguous_import(dir, bounds);
+ }
+ break;
+
+ case IMPORT_FINISHING:
+ assert(dir);
+ dout(10) << "import state=finishing : finishing import on " << *dir << dendl;
+ import_finish(dir, true);
+ break;
+
+ case IMPORT_ABORTING:
+ 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) {
+ 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;
+ }
+
+ while (!pinned_dirs.empty()) {
+ CDir *dir = pinned_dirs.front();
+ dout(10) << "removing temp auth_pin on " << *dir << dendl;
+ dir->auth_unpin(this);
+ pinned_dirs.pop_front();
+ }
+}
+
+
+
+void Migrator::show_importing()
+{
+ dout(10) << "show_importing" << dendl;
+ for (map<dirfrag_t,import_state_t>::iterator p = import_state.begin();
+ p != import_state.end();
+ ++p) {
+ CDir *dir = mds->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) << "show_exporting" << dendl;
+ for (map<CDir*,export_state_t>::iterator p = export_state.begin();
+ p != export_state.end();
+ ++p)
+ dout(10) << " exporting to " << p->second.peer
+ << ": (" << p->second.state << ") " << get_export_statename(p->second.state)
+ << " " << p->first->dirfrag() << " " << *p->first << 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 = cache->get_inode(p->first.ino);
+ assert(in);
+ continue;
+ }
+ CDir *dir = cache->get_dirfrag(p->first);
+ assert(dir);
+ if (p->second.state == IMPORT_PREPPING)
+ continue;
+ if (p->second.state == IMPORT_ABORTING) {
+ assert(!dir->is_ambiguous_dir_auth());
+ assert(dir->get_dir_auth().first != mds->get_nodeid());
+ continue;
+ }
+ assert(dir->is_ambiguous_dir_auth());
+ 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;
+ assert(dir->is_ambiguous_dir_auth());
+ 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) << "export_dir_nicely " << *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;
+ while (!export_queue.empty() &&
+ export_state.size() <= 4) {
+ dirfrag_t df = export_queue.front().first;
+ mds_rank_t dest = export_queue.front().second;
+ export_queue.pop_front();
+
+ CDir *dir = mds->mdcache->get_dirfrag(df);
+ if (!dir) continue;
+ if (!dir->is_auth()) continue;
+
+ dout(0) << "nicely exporting to mds." << dest << " " << *dir << dendl;
+
+ export_dir(dir, dest);
+ }
+ running = false;
+}
+
+
+
+
+class C_MDC_ExportFreeze : public MigratorContext {
+ CDir *ex; // dir i'm exporting
+ uint64_t tid;
+public:
+ C_MDC_ExportFreeze(Migrator *m, CDir *e, uint64_t t) :
+ MigratorContext(m), ex(e), tid(t) {
+ assert(ex != NULL);
+ }
+ void finish(int r) override {
+ if (r >= 0)
+ mig->export_frozen(ex, tid);
+ }
+};
+
+
+void Migrator::get_export_lock_set(CDir *dir, set<SimpleLock*>& locks)
+{
+ // path
+ vector<CDentry*> trace;
+ cache->make_trace(trace, dir->inode);
+ for (vector<CDentry*>::iterator it = trace.begin();
+ it != trace.end();
+ ++it)
+ locks.insert(&(*it)->lock);
+
+ // prevent scatter gather race
+ locks.insert(&dir->get_inode()->dirfragtreelock);
+
+ // 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;
+ cache->get_wouldbe_subtree_bounds(dir, wouldbe_bounds);
+ for (set<CDir*>::iterator p = wouldbe_bounds.begin(); p != wouldbe_bounds.end(); ++p)
+ locks.insert(&(*p)->get_inode()->dirfragtreelock);
+}
+
+
+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);
+ }
+};
+
+
+/** 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)
+{
+ dout(7) << "export_dir " << *dir << " to " << dest << dendl;
+ assert(dir->is_auth());
+ assert(dest != mds->get_nodeid());
+
+ if (!(mds->is_active() || mds->is_stopping())) {
+ dout(7) << "i'm not active, no exports for now" << dendl;
+ return;
+ }
+ if (mds->mdcache->is_readonly()) {
+ dout(7) << "read-only FS, no exports for now" << dendl;
+ return;
+ }
+ if (!mds->mdsmap->is_active(dest)) {
+ dout(7) << "dest not active, no exports for now" << dendl;
+ return;
+ }
+ if (mds->is_cluster_degraded()) {
+ dout(7) << "cluster degraded, no exports for now" << dendl;
+ return;
+ }
+ if (dir->inode->is_system()) {
+ dout(7) << "i won't export system dirs (root, mdsdirs, stray, /.ceph, etc.)" << dendl;
+ //ceph_abort();
+ return;
+ }
+
+ if (!dir->inode->is_base() && dir->inode->get_projected_parent_dir()->inode->is_stray() &&
+ dir->inode->get_projected_parent_dir()->get_parent_dir()->ino() != MDS_INO_MDSDIR(dest)) {
+ dout(7) << "i won't export anything in stray" << dendl;
+ return;
+ }
+
+ if (dir->is_frozen() ||
+ dir->is_freezing()) {
+ dout(7) << " can't export, freezing|frozen. wait for other exports to finish first." << dendl;
+ return;
+ }
+ if (dir->state_test(CDir::STATE_EXPORTING)) {
+ dout(7) << "already exporting" << dendl;
+ return;
+ }
+
+ if (!mds->is_stopping() && !dir->inode->is_exportable(dest)) {
+ dout(7) << "dir is export pinned" << dendl;
+ return;
+ }
+
+ if (dest == mds->get_nodeid() || !mds->mdsmap->is_up(dest)) {
+ dout(7) << "cannot export: dest " << dest << " is me or is not active" << dendl;
+ return;
+ }
+
+ if (g_conf->mds_thrash_exports) {
+ // create random subtree bound (which will not be exported)
+ list<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())
+ in->get_nested_dirfrags(ls);
+ }
+ }
+ 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())) {
+ assert(bd->is_auth());
+ dir->state_set(CDir::STATE_AUXSUBTREE);
+ mds->mdcache->adjust_subtree_auth(dir, mds->get_nodeid());
+ dout(0) << "export_dir: create aux subtree " << *bd << " under " << *dir << dendl;
+ }
+ }
+ }
+
+ mds->hit_export_target(ceph_clock_now(), dest, -1);
+
+ dir->auth_pin(this);
+ dir->state_set(CDir::STATE_EXPORTING);
+
+ MDRequestRef mdr = mds->mdcache->request_start_internal(CEPH_MDS_OP_EXPORTDIR);
+ mdr->more()->export_dir = dir;
+
+ assert(export_state.count(dir) == 0);
+ export_state_t& stat = export_state[dir];
+ stat.state = EXPORT_LOCKING;
+ stat.peer = dest;
+ stat.tid = mdr->reqid.tid;
+ stat.mut = mdr;
+
+ return mds->mdcache->dispatch_request(mdr);
+}
+
+void Migrator::dispatch_export_dir(MDRequestRef& mdr, int count)
+{
+ dout(7) << "dispatch_export_dir " << *mdr << dendl;
+
+ CDir *dir = mdr->more()->export_dir;
+ 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;
+ mds->mdcache->request_finish(mdr);
+ return;
+ }
+ assert(it->second.state == EXPORT_LOCKING);
+
+ 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(5) << "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;
+ }
+
+ if (mdr->aborted || dir->is_frozen() || dir->is_freezing()) {
+ dout(7) << "wouldblock|freezing|frozen, canceling export" << dendl;
+ export_try_cancel(dir);
+ return;
+ }
+
+ // locks?
+ set<SimpleLock*> rdlocks;
+ set<SimpleLock*> xlocks;
+ set<SimpleLock*> wrlocks;
+ get_export_lock_set(dir, rdlocks);
+ // 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.
+ wrlocks.insert(&dir->get_inode()->filelock);
+ wrlocks.insert(&dir->get_inode()->nestlock);
+ if (dir->get_inode()->is_auth()) {
+ dir->get_inode()->filelock.set_scatter_wanted();
+ dir->get_inode()->nestlock.set_scatter_wanted();
+ }
+
+ if (!mds->locker->acquire_locks(mdr, rdlocks, wrlocks, xlocks, NULL, NULL, true)) {
+ if (mdr->aborted)
+ export_try_cancel(dir);
+ return;
+ }
+
+ assert(g_conf->mds_kill_export_at != 1);
+ it->second.state = EXPORT_DISCOVERING;
+
+ // send ExportDirDiscover (ask target)
+ filepath path;
+ dir->inode->make_path(path);
+ MExportDirDiscover *discover = new MExportDirDiscover(dir->dirfrag(), path,
+ mds->get_nodeid(),
+ it->second.tid);
+ mds->send_message_mds(discover, dest);
+ assert(g_conf->mds_kill_export_at != 2);
+
+ it->second.last_cum_auth_pins_change = ceph_clock_now();
+
+ // start the freeze, but hold it up with an auth_pin.
+ dir->freeze_tree();
+ assert(dir->is_freezing_tree());
+ dir->add_waiter(CDir::WAIT_FROZEN, new C_MDC_ExportFreeze(this, dir, it->second.tid));
+}
+
+/*
+ * called on receipt of MExportDirDiscoverAck
+ * the importer now has the directory's _inode_ in memory, and pinned.
+ *
+ * This function DOES put the passed message before returning
+ */
+void Migrator::handle_export_discover_ack(MExportDirDiscoverAck *m)
+{
+ CDir *dir = cache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ utime_t now = ceph_clock_now();
+ assert(dir);
+
+ dout(7) << "export_discover_ack from " << m->get_source()
+ << " on " << *dir << dendl;
+
+ mds->hit_export_target(now, 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 {
+ assert(it->second.state == EXPORT_DISCOVERING);
+
+ if (m->is_success()) {
+ // release locks to avoid deadlock
+ MDRequestRef mdr = static_cast<MDRequestImpl*>(it->second.mut.get());
+ assert(mdr);
+ mds->mdcache->request_finish(mdr);
+ it->second.mut.reset();
+ // freeze the subtree
+ it->second.state = EXPORT_FREEZING;
+ dir->auth_unpin(this);
+ assert(g_conf->mds_kill_export_at != 3);
+
+ } else {
+ dout(7) << "peer failed to discover (not active?), canceling" << dendl;
+ export_try_cancel(dir, false);
+ }
+ }
+
+ m->put(); // done
+}
+
+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) {
+ assert(dir != NULL);
+ }
+ void finish(int r) override {
+ mig->export_sessions_flushed(dir, tid);
+ }
+};
+
+void Migrator::export_sessions_flushed(CDir *dir, uint64_t tid)
+{
+ dout(7) << "export_sessions_flushed " << *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;
+ }
+
+ assert(it->second.state == EXPORT_PREPPING || it->second.state == EXPORT_WARNING);
+ 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::export_frozen(CDir *dir, uint64_t tid)
+{
+ dout(7) << "export_frozen on " << *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;
+ }
+
+ assert(it->second.state == EXPORT_FREEZING);
+ assert(dir->is_frozen_tree_root());
+ assert(dir->get_cum_auth_pins() == 0);
+
+ CInode *diri = dir->get_inode();
+
+ // ok, try to grab all my locks.
+ set<SimpleLock*> rdlocks;
+ get_export_lock_set(dir, rdlocks);
+ if ((diri->is_auth() && diri->is_frozen()) ||
+ !mds->locker->can_rdlock_set(rdlocks) ||
+ !diri->filelock.can_wrlock(-1) ||
+ !diri->nestlock.can_wrlock(-1)) {
+ dout(7) << "export_dir couldn't acquire all needed locks, failing. "
+ << *dir << dendl;
+ // .. unwind ..
+ dir->unfreeze_tree();
+ cache->try_subtree_merge(dir);
+
+ mds->send_message_mds(new MExportDirCancel(dir->dirfrag(), it->second.tid), it->second.peer);
+ export_state.erase(it);
+
+ dir->state_clear(CDir::STATE_EXPORTING);
+ cache->maybe_send_pending_resolves();
+ return;
+ }
+
+ it->second.mut = new MutationImpl();
+ if (diri->is_auth())
+ it->second.mut->auth_pin(diri);
+ mds->locker->rdlock_take_set(rdlocks, it->second.mut);
+ mds->locker->wrlock_force(&diri->filelock, it->second.mut);
+ mds->locker->wrlock_force(&diri->nestlock, it->second.mut);
+
+ cache->show_subtrees();
+
+ // CDir::_freeze_tree() should have forced it into subtree.
+ assert(dir->get_dir_auth() == mds_authority_t(mds->get_nodeid(), mds->get_nodeid()));
+ // note the bounds.
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+
+ // generate prep message, log entry.
+ MExportDirPrep *prep = new 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
+ cache->replicate_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 (set<CDir*>::iterator p = bounds.begin();
+ p != bounds.end();
+ ++p) {
+ CDir *bound = *p;
+
+ // pin it.
+ bound->get(CDir::PIN_EXPORTBOUND);
+ bound->state_set(CDir::STATE_EXPORTBOUND);
+
+ dout(7) << " export bound " << *bound << dendl;
+ prep->add_bound( bound->dirfrag() );
+
+ // trace to bound
+ bufferlist tracebl;
+ CDir *cur = bound;
+
+ 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
+ assert(cur->inode->is_auth());
+ bufferlist bl;
+ cache->replicate_dentry(cur->inode->parent, it->second.peer, bl);
+ dout(7) << " added " << *cur->inode->parent << dendl;
+ cache->replicate_inode(cur->inode, it->second.peer, bl,
+ mds->mdsmap->get_up_features());
+ dout(7) << " added " << *cur->inode << dendl;
+ bl.claim_append(tracebl);
+ tracebl.claim(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
+ cache->replicate_dir(cur, it->second.peer, bl);
+ dout(7) << " added " << *cur << dendl;
+ bl.claim_append(tracebl);
+ tracebl.claim(bl);
+
+ start = 'f'; // start with dirfrag
+ }
+ bufferlist final_bl;
+ dirfrag_t df = cur->dirfrag();
+ ::encode(df, final_bl);
+ ::encode(start, final_bl);
+ final_bl.claim_append(tracebl);
+ prep->add_trace(final_bl);
+ }
+
+ // send.
+ it->second.state = EXPORT_PREPPING;
+ mds->send_message_mds(prep, it->second.peer);
+ assert (g_conf->mds_kill_export_at != 4);
+
+ // make sure any new instantiations of caps are flushed out
+ 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)
+{
+ list<CDir*> dfs;
+ dfs.push_back(dir);
+ while (!dfs.empty()) {
+ CDir *dir = dfs.front();
+ dfs.pop_front();
+ for (CDir::map_t::iterator p = dir->begin(); p != dir->end(); ++p) {
+ CDentry *dn = p->second;
+ if (!dn->get_linkage()->is_primary())
+ continue;
+ CInode *in = dn->get_linkage()->get_inode();
+ if (in->is_dir()) {
+ // directory?
+ list<CDir*> ls;
+ in->get_dirfrags(ls);
+ for (list<CDir*>::iterator q = ls.begin(); q != ls.end(); ++q) {
+ if (!(*q)->state_test(CDir::STATE_EXPORTBOUND)) {
+ // include nested dirfrag
+ assert((*q)->get_dir_auth().first == CDIR_AUTH_PARENT);
+ dfs.push_back(*q); // it's ours, recurse (later)
+ }
+ }
+ }
+ for (map<client_t, Capability*>::iterator q = in->client_caps.begin();
+ q != in->client_caps.end();
+ ++q)
+ client_set.insert(q->first);
+ }
+ }
+}
+
+void Migrator::get_export_client_set(CInode *in, set<client_t>& client_set)
+{
+ for (map<client_t, Capability*>::iterator q = in->client_caps.begin();
+ q != in->client_caps.end();
+ ++q)
+ client_set.insert(q->first);
+}
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_prep_ack(MExportDirPrepAck *m)
+{
+ CDir *dir = cache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ utime_t now = ceph_clock_now();
+ assert(dir);
+
+ dout(7) << "export_prep_ack " << *dir << dendl;
+
+ mds->hit_export_target(now, 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;
+ m->put();
+ return;
+ }
+ 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);
+ m->put();
+ return;
+ }
+
+ assert (g_conf->mds_kill_export_at != 5);
+ // send warnings
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+
+ assert(it->second.warning_ack_waiting.empty() ||
+ (it->second.warning_ack_waiting.size() == 1 &&
+ it->second.warning_ack_waiting.count(MDS_RANK_NONE) > 0));
+ 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!
+
+ MExportDirNotify *notify = new 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 (set<CDir*>::iterator q = bounds.begin(); q != bounds.end(); ++q)
+ notify->get_bounds().push_back((*q)->dirfrag());
+ mds->send_message_mds(notify, p.first);
+
+ }
+
+ it->second.state = EXPORT_WARNING;
+
+ assert(g_conf->mds_kill_export_at != 6);
+ // nobody to warn?
+ if (it->second.warning_ack_waiting.empty())
+ export_go(dir); // start export.
+
+ // done.
+ m->put();
+}
+
+
+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) {
+ assert(dir != NULL);
+ }
+ void finish(int r) override {
+ mig->export_go_synced(dir, tid);
+ }
+};
+
+void Migrator::export_go(CDir *dir)
+{
+ assert(export_state.count(dir));
+ dout(7) << "export_go " << *dir << " to " << export_state[dir].peer << dendl;
+
+ // first sync log to flush out e.g. any cap imports
+ mds->mdlog->wait_for_safe(new C_M_ExportGo(this, dir, export_state[dir].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;
+ }
+ assert(it->second.state == EXPORT_WARNING);
+ mds_rank_t dest = it->second.peer;
+
+ dout(7) << "export_go_synced " << *dir << " to " << dest << dendl;
+
+ cache->show_subtrees();
+
+ it->second.state = EXPORT_EXPORTING;
+ assert(g_conf->mds_kill_export_at != 7);
+
+ assert(dir->is_frozen_tree_root());
+ assert(dir->get_cum_auth_pins() == 0);
+
+ // set ambiguous auth
+ cache->adjust_subtree_auth(dir, mds->get_nodeid(), dest);
+
+ // take away the popularity we're sending.
+ utime_t now = ceph_clock_now();
+ mds->balancer->subtract_export(dir, now);
+
+ // fill export message with cache data
+ MExportDir *req = new MExportDir(dir->dirfrag(), it->second.tid);
+ map<client_t,entity_inst_t> exported_client_map;
+ uint64_t num_exported_inodes = encode_export_dir(req->export_data,
+ dir, // recur start point
+ exported_client_map,
+ now);
+ ::encode(exported_client_map, req->client_map,
+ mds->mdsmap->get_up_features());
+
+ // add bounds to message
+ set<CDir*> bounds;
+ cache->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);
+ assert(g_conf->mds_kill_export_at != 8);
+
+ mds->hit_export_target(now, 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);
+
+ cache->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)
+{
+ dout(7) << "encode_export_inode " << *in << dendl;
+ assert(!in->is_replica(mds->get_nodeid()));
+
+ // relax locks?
+ if (!in->is_replicated()) {
+ in->replicate_relax_locks();
+ dout(20) << " did replicate_relax_locks, now " << *in << dendl;
+ }
+
+ ::encode(in->inode.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);
+}
+
+void Migrator::encode_export_inode_caps(CInode *in, bool auth_cap, bufferlist& bl,
+ map<client_t,entity_inst_t>& exported_client_map)
+{
+ dout(20) << "encode_export_inode_caps " << *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 (map<client_t, Capability*>::iterator it = in->client_caps.begin();
+ it != in->client_caps.end();
+ ++it)
+ exported_client_map[it->first] = mds->sessionmap.get_inst(entity_name_t::CLIENT(it->first.v));
+}
+
+void Migrator::finish_export_inode_caps(CInode *in, mds_rank_t peer,
+ map<client_t,Capability::Import>& peer_imported)
+{
+ dout(20) << "finish_export_inode_caps " << *in << dendl;
+
+ in->state_clear(CInode::STATE_EXPORTINGCAPS);
+ in->put(CInode::PIN_EXPORTINGCAPS);
+
+ // tell (all) clients about migrating caps..
+ for (map<client_t, Capability*>::iterator it = in->client_caps.begin();
+ it != in->client_caps.end();
+ ++it) {
+ Capability *cap = it->second;
+ dout(7) << "finish_export_inode_caps telling client." << it->first
+ << " exported caps on " << *in << dendl;
+ MClientCaps *m = new 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(it->first);
+ assert(q != peer_imported.end());
+ m->set_cap_peer(q->second.cap_id, q->second.issue_seq, q->second.mseq, peer, 0);
+ mds->send_message_client_counted(m, it->first);
+ }
+ in->clear_client_caps_after_export();
+ mds->locker->eval(in, CEPH_CAP_LOCKS);
+}
+
+void Migrator::finish_export_inode(CInode *in, utime_t now, mds_rank_t peer,
+ map<client_t,Capability::Import>& peer_imported,
+ list<MDSInternalContextBase*>& finished)
+{
+ dout(12) << "finish_export_inode " << *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
+ 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->item_open_file.remove_myself();
+
+ in->clear_dirty_parent();
+
+ in->clear_file_locks();
+
+ // waiters
+ in->take_waiting(CInode::WAIT_ANY_MASK, finished);
+
+ in->finish_export(now);
+
+ finish_export_inode_caps(in, peer, peer_imported);
+}
+
+uint64_t Migrator::encode_export_dir(bufferlist& exportbl,
+ CDir *dir,
+ map<client_t,entity_inst_t>& exported_client_map,
+ utime_t now)
+{
+ uint64_t num_exported = 0;
+
+ dout(7) << "encode_export_dir " << *dir << " " << dir->get_num_head_items() << " head items" << dendl;
+
+ 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
+ list<CDir*> subdirs;
+ CDir::map_t::iterator it;
+ for (it = dir->begin(); it != dir->end(); ++it) {
+ CDentry *dn = it->second;
+ CInode *in = dn->get_linkage()->get_inode();
+
+ if (!dn->is_replicated())
+ dn->lock.replicate_relax();
+
+ num_exported++;
+
+ // -- dentry
+ dout(7) << "encode_export_dir exporting " << *dn << dendl;
+
+ // dn name
+ ::encode(dn->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()) {
+ // remote link
+ exportbl.append("L", 1); // remote link
+
+ inodeno_t ino = dn->get_linkage()->get_remote_ino();
+ unsigned char d_type = dn->get_linkage()->get_remote_d_type();
+ ::encode(ino, exportbl);
+ ::encode(d_type, exportbl);
+ continue;
+ }
+
+ // primary link
+ // -- inode
+ exportbl.append("I", 1); // inode dentry
+
+ encode_export_inode(in, exportbl, exported_client_map); // encode, and (update state for) export
+
+ // directory?
+ list<CDir*> dfs;
+ in->get_dirfrags(dfs);
+ for (list<CDir*>::iterator p = dfs.begin(); p != dfs.end(); ++p) {
+ CDir *t = *p;
+ if (!t->state_test(CDir::STATE_EXPORTBOUND)) {
+ // include nested dirfrag
+ assert(t->get_dir_auth().first == CDIR_AUTH_PARENT);
+ subdirs.push_back(t); // it's ours, recurse (later)
+ }
+ }
+ }
+
+ // subdirs
+ for (list<CDir*>::iterator it = subdirs.begin(); it != subdirs.end(); ++it)
+ num_exported += encode_export_dir(exportbl, *it, exported_client_map, now);
+
+ return num_exported;
+}
+
+void Migrator::finish_export_dir(CDir *dir, utime_t now, mds_rank_t peer,
+ map<inodeno_t,map<client_t,Capability::Import> >& peer_imported,
+ list<MDSInternalContextBase*>& finished, int *num_dentries)
+{
+ dout(10) << "finish_export_dir " << *dir << dendl;
+
+ // release open_by
+ dir->clear_replica_map();
+
+ // mark
+ 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(now);
+
+ // dentries
+ list<CDir*> subdirs;
+ CDir::map_t::iterator it;
+ for (it = dir->begin(); it != dir->end(); ++it) {
+ CDentry *dn = it->second;
+ CInode *in = dn->get_linkage()->get_inode();
+
+ // dentry
+ dn->finish_export();
+
+ // inode?
+ if (dn->get_linkage()->is_primary()) {
+ finish_export_inode(in, now, peer, peer_imported[in->ino()], finished);
+
+ // subdirs?
+ in->get_nested_dirfrags(subdirs);
+ }
+
+ cache->touch_dentry_bottom(dn); // move dentry to tail of LRU
+ ++(*num_dentries);
+ }
+
+ // subdirs
+ for (list<CDir*>::iterator it = subdirs.begin(); it != subdirs.end(); ++it)
+ finish_export_dir(*it, now, 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.
+ *
+ * This function DOES put the passed message before returning
+ */
+void Migrator::handle_export_ack(MExportDirAck *m)
+{
+ CDir *dir = cache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ utime_t now = ceph_clock_now();
+ assert(dir);
+ assert(dir->is_frozen_tree_root()); // i'm exporting!
+
+ // yay!
+ dout(7) << "handle_export_ack " << *dir << dendl;
+
+ mds->hit_export_target(now, dest, -1);
+
+ map<CDir*,export_state_t>::iterator it = export_state.find(dir);
+ assert(it != export_state.end());
+ assert(it->second.state == EXPORT_EXPORTING);
+ assert(it->second.tid == m->get_tid());
+
+ bufferlist::iterator bp = m->imported_caps.begin();
+ ::decode(it->second.peer_imported, bp);
+
+ it->second.state = EXPORT_LOGGINGFINISH;
+ assert (g_conf->mds_kill_export_at != 9);
+ set<CDir*> bounds;
+ cache->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.
+ cache->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();
+ assert (g_conf->mds_kill_export_at != 10);
+
+ m->put();
+}
+
+void Migrator::export_notify_abort(CDir *dir, set<CDir*>& bounds)
+{
+ dout(7) << "export_notify_abort " << *dir << dendl;
+
+ export_state_t& stat = export_state[dir];
+ 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) {
+ MExportDirNotify *notify = new 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 hte dest failes after i send teh 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)
+{
+ dout(7) << "export_reverse " << *dir << dendl;
+
+ set<CInode*> to_eval;
+
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+
+ // remove exporting pins
+ list<CDir*> rq;
+ rq.push_back(dir);
+ while (!rq.empty()) {
+ CDir *t = rq.front();
+ rq.pop_front();
+ t->abort_export();
+ for (CDir::map_t::iterator p = t->items.begin(); p != t->items.end(); ++p) {
+ p->second->abort_export();
+ if (!p->second->get_linkage()->is_primary())
+ continue;
+ CInode *in = p->second->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())
+ in->get_nested_dirfrags(rq);
+ }
+ }
+
+ // unpin bounds
+ for (const auto &bd : bounds) {
+ bd->put(CDir::PIN_EXPORTBOUND);
+ bd->state_clear(CDir::STATE_EXPORTBOUND);
+ }
+
+ // notify bystanders
+ export_notify_abort(dir, bounds);
+
+ // unfreeze tree, with possible subtree merge.
+ cache->adjust_subtree_auth(dir, mds->get_nodeid(), mds->get_nodeid());
+
+ // process delayed expires
+ cache->process_delayed_expire(dir);
+
+ dir->unfreeze_tree();
+ cache->try_subtree_merge(dir);
+
+ // revoke/resume stale caps
+ for (auto in : to_eval) {
+ bool need_issue = false;
+ for (auto& p : in->get_client_caps()) {
+ Capability *cap = p.second;
+ if (cap->is_stale()) {
+ mds->locker->revoke_stale_caps(cap);
+ } else {
+ need_issue = true;
+ }
+ }
+ if (need_issue &&
+ (!in->is_auth() || !mds->locker->eval(in, CEPH_CAP_LOCKS)))
+ mds->locker->issue_caps(in);
+ }
+
+ cache->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) << "export_logged_finish " << *dir << dendl;
+
+ export_state_t& stat = export_state[dir];
+
+ // send notifies
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+
+ for (set<mds_rank_t>::iterator p = stat.notify_ack_waiting.begin();
+ p != stat.notify_ack_waiting.end();
+ ++p) {
+ MExportDirNotify *notify = new 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;
+ 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(new 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.
+ *
+ * This function DOES put the passed message before returning
+ */
+void Migrator::handle_export_notify_ack(MExportDirNotifyAck *m)
+{
+ CDir *dir = cache->get_dirfrag(m->get_dirfrag());
+ mds_rank_t dest(m->get_source().num());
+ utime_t now = ceph_clock_now();
+ assert(dir);
+ mds_rank_t from = mds_rank_t(m->get_source().num());
+
+ mds->hit_export_target(now, 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) << "handle_export_notify_ack 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) << "handle_export_notify_ack 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) << "handle_export_notify_ack from " << m->get_source()
+ << ": cancelling export, processing notify on " << *dir << dendl;
+ if (stat.notify_ack_waiting.empty()) {
+ export_state.erase(export_state_entry);
+ export_cancel_finish(dir);
+ }
+ }
+ }
+ 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) << "handle_export_notify_ack from " << m->get_source()
+ << ": aborting import on " << *dir << dendl;
+ assert(stat.bystanders.count(from));
+ stat.bystanders.erase(from);
+ if (stat.bystanders.empty())
+ import_reverse_unfreeze(dir);
+ }
+ }
+ }
+
+ m->put();
+}
+
+void Migrator::export_finish(CDir *dir)
+{
+ dout(5) << "export_finish " << *dir << dendl;
+
+ 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(new MExportDirFinish(dir->dirfrag(), true, it->second.tid), it->second.peer);
+ } else {
+ dout(7) << "not sending MExportDirFinish last, dest has failed" << dendl;
+ }
+ assert(g_conf->mds_kill_export_at != 13);
+
+ // finish export (adjust local cache state)
+ int num_dentries = 0;
+ list<MDSInternalContextBase*> finished;
+ finish_export_dir(dir, ceph_clock_now(), it->second.peer,
+ it->second.peer_imported, finished, &num_dentries);
+
+ assert(!dir->is_auth());
+ cache->adjust_subtree_auth(dir, it->second.peer);
+
+ // unpin bounds
+ set<CDir*> bounds;
+ cache->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
+ cache->discard_delayed_expire(dir);
+
+ dout(7) << "export_finish unfreezing" << dendl;
+
+ // unfreeze tree, with possible subtree merge.
+ // (we do this _after_ removing EXPORTBOUND pins, to allow merges)
+ dir->unfreeze_tree();
+ cache->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 = it->second.mut;
+ // remove from exporting list, clean up state
+ export_state.erase(it);
+ dir->state_clear(CDir::STATE_EXPORTING);
+
+ cache->show_subtrees();
+ audit();
+
+ cache->trim(num_dentries); // try trimming exported dentries
+
+ // send pending import_maps?
+ mds->mdcache->maybe_send_pending_resolves();
+
+ // drop locks, unpin path
+ if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ maybe_do_queued_export();
+}
+
+
+
+
+
+
+
+
+// ==========================================================
+// IMPORT
+
+void Migrator::handle_export_discover(MExportDirDiscover *m)
+{
+ mds_rank_t from = m->get_source_mds();
+ assert(from != mds->get_nodeid());
+
+ dout(7) << "handle_export_discover on " << 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(new MExportDirDiscoverAck(df, m->get_tid(), false), from);
+ m->put();
+ return;
+ }
+
+ // only start discovering on this message once.
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(df);
+ if (!m->started) {
+ assert(it == import_state.end());
+ m->started = true;
+ import_state[df].state = IMPORT_DISCOVERING;
+ import_state[df].peer = from;
+ import_state[df].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;
+ m->put();
+ return;
+ }
+ assert(it->second.state == IMPORT_DISCOVERING);
+ }
+
+ if (!mds->mdcache->is_open()) {
+ dout(5) << " waiting for root" << dendl;
+ mds->mdcache->wait_for_open(new C_MDS_RetryMessage(mds, m));
+ return;
+ }
+
+ assert (g_conf->mds_kill_import_at != 1);
+
+ // do we have it?
+ CInode *in = cache->get_inode(m->get_dirfrag().ino);
+ if (!in) {
+ // must discover it!
+ filepath fpath(m->get_path());
+ vector<CDentry*> trace;
+ MDRequestRef null_ref;
+ int r = cache->path_traverse(null_ref, m, NULL, fpath, &trace, NULL, MDS_TRAVERSE_DISCOVER);
+ if (r > 0) return;
+ if (r < 0) {
+ dout(7) << "handle_export_discover_2 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) << "handle_export_discover have " << df << " inode " << *in << dendl;
+
+ import_state[df].state = IMPORT_DISCOVERED;
+
+ // pin inode in the cache (for now)
+ assert(in->is_dir());
+ in->get(CInode::PIN_IMPORTING);
+
+ // reply
+ dout(7) << " sending export_discover_ack on " << *in << dendl;
+ mds->send_message_mds(new MExportDirDiscoverAck(df, m->get_tid()), import_state[df].peer);
+ m->put();
+ 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)
+{
+ set<CDir*> bounds;
+ cache->map_dirfrag_set(import_state[dir->dirfrag()].bound_ls, bounds);
+ import_remove_pins(dir, bounds);
+ import_reverse_final(dir);
+}
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_cancel(MExportDirCancel *m)
+{
+ dout(7) << "handle_export_cancel 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()) {
+ assert(0 == "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 = cache->get_inode(df.ino);
+ assert(in);
+ import_reverse_discovered(df, in);
+ } else if (it->second.state == IMPORT_PREPPING) {
+ CDir *dir = mds->mdcache->get_dirfrag(df);
+ assert(dir);
+ import_reverse_prepping(dir);
+ } else if (it->second.state == IMPORT_PREPPED) {
+ CDir *dir = mds->mdcache->get_dirfrag(df);
+ assert(dir);
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+ import_remove_pins(dir, bounds);
+ // adjust auth back to the exportor
+ cache->adjust_subtree_auth(dir, it->second.peer);
+ import_reverse_unfreeze(dir);
+ } else {
+ assert(0 == "got export_cancel in weird state");
+ }
+ m->put();
+}
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_prep(MExportDirPrep *m)
+{
+ mds_rank_t oldauth = mds_rank_t(m->get_source().num());
+ assert(oldauth != mds->get_nodeid());
+
+ CDir *dir;
+ CInode *diri;
+ list<MDSInternalContextBase*> finished;
+
+ // assimilate root dir.
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(m->get_dirfrag());
+ if (!m->did_assim()) {
+ assert(it != import_state.end());
+ assert(it->second.state == IMPORT_DISCOVERED);
+ assert(it->second.peer == oldauth);
+ diri = cache->get_inode(m->get_dirfrag().ino);
+ assert(diri);
+ bufferlist::iterator p = m->basedir.begin();
+ dir = cache->add_replica_dir(p, diri, oldauth, finished);
+ dout(7) << "handle_export_prep on " << *dir << " (first pass)" << dendl;
+ } else {
+ if (it == import_state.end() ||
+ it->second.peer != oldauth ||
+ it->second.tid != m->get_tid()) {
+ dout(7) << "handle_export_prep obsolete message, dropping" << dendl;
+ m->put();
+ return;
+ }
+ assert(it->second.state == IMPORT_PREPPING);
+ assert(it->second.peer == oldauth);
+
+ dir = cache->get_dirfrag(m->get_dirfrag());
+ assert(dir);
+ dout(7) << "handle_export_prep on " << *dir << " (subsequent pass)" << dendl;
+ diri = dir->get_inode();
+ }
+ assert(dir->is_auth() == false);
+
+ cache->show_subtrees();
+
+ // build import bound map
+ map<inodeno_t, fragset_t> import_bound_fragset;
+ for (list<dirfrag_t>::iterator p = m->get_bounds().begin();
+ p != m->get_bounds().end();
+ ++p) {
+ dout(10) << " bound " << *p << dendl;
+ import_bound_fragset[p->ino].insert(p->frag);
+ }
+
+ // assimilate contents?
+ if (!m->did_assim()) {
+ dout(7) << "doing assim on " << *dir << dendl;
+ m->mark_assim(); // only do this the first time!
+
+ // change import state
+ it->second.state = IMPORT_PREPPING;
+ it->second.bound_ls = m->get_bounds();
+ it->second.bystanders = m->get_bystanders();
+ 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 (list<bufferlist>::iterator p = m->traces.begin();
+ p != m->traces.end();
+ ++p) {
+ bufferlist::iterator q = p->begin();
+ dirfrag_t df;
+ ::decode(df, q);
+ char start;
+ ::decode(start, q);
+ dout(10) << " trace from " << df << " start " << start << " len " << p->length() << dendl;
+
+ CDir *cur = 0;
+ if (start == 'd') {
+ cur = cache->get_dirfrag(df);
+ assert(cur);
+ dout(10) << " had " << *cur << dendl;
+ } else if (start == 'f') {
+ CInode *in = cache->get_inode(df.ino);
+ assert(in);
+ dout(10) << " had " << *in << dendl;
+ cur = cache->add_replica_dir(q, in, oldauth, finished);
+ dout(10) << " added " << *cur << dendl;
+ } else if (start == '-') {
+ // nothing
+ } else
+ assert(0 == "unrecognized start char");
+
+ while (start != '-') {
+ CDentry *dn = cache->add_replica_dentry(q, cur, finished);
+ dout(10) << " added " << *dn << dendl;
+ CInode *in = cache->add_replica_inode(q, dn, finished);
+ dout(10) << " added " << *in << dendl;
+ if (q.end())
+ break;
+ cur = cache->add_replica_dir(q, in, oldauth, finished);
+ dout(10) << " added " << *cur << dendl;
+ }
+ }
+
+ // make bound sticky
+ for (map<inodeno_t,fragset_t>::iterator p = import_bound_fragset.begin();
+ p != import_bound_fragset.end();
+ ++p) {
+ CInode *in = cache->get_inode(p->first);
+ assert(in);
+ in->get_stickydirs();
+ dout(7) << " set stickydirs on bound inode " << *in << dendl;
+ }
+
+ } else {
+ dout(7) << " not doing assim on " << *dir << dendl;
+ }
+
+ 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 = cache->get_inode(p->first);
+ assert(in);
+
+ // map fragset into a frag_t list, based on the inode fragtree
+ list<frag_t> fglist;
+ for (set<frag_t>::iterator q = p->second.begin(); q != p->second.end(); ++q)
+ in->dirfragtree.get_leaves_under(*q, fglist);
+ dout(10) << " bound inode " << p->first << " fragset " << p->second << " maps to " << fglist << dendl;
+
+ for (list<frag_t>::iterator q = fglist.begin();
+ q != fglist.end();
+ ++q) {
+ CDir *bound = cache->get_dirfrag(dirfrag_t(p->first, *q));
+ if (!bound) {
+ dout(7) << " opening bounding dirfrag " << *q << " on " << *in << dendl;
+ cache->open_remote_dirfrag(in, *q,
+ new C_MDS_RetryMessage(mds, m));
+ return;
+ }
+
+ 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);
+ }
+ }
+
+ dout(7) << " all ready, noting auth and freezing import region" << dendl;
+
+ if (!mds->mdcache->is_readonly() &&
+ dir->get_inode()->filelock.can_wrlock(-1) &&
+ dir->get_inode()->nestlock.can_wrlock(-1)) {
+ 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.
+ cache->adjust_bounded_subtree_auth(dir, import_bounds,
+ pair<int,int>(oldauth, mds->get_nodeid()));
+ cache->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);
+
+ // ok!
+ dout(7) << " sending export_prep_ack on " << *dir << dendl;
+ mds->send_message(new MExportDirPrepAck(dir->dirfrag(), success, m->get_tid()), m->get_connection());
+
+ assert(g_conf->mds_kill_import_at != 4);
+ // done
+ m->put();
+}
+
+
+
+
+class C_MDS_ImportDirLoggedStart : public MigratorLogContext {
+ dirfrag_t df;
+ CDir *dir;
+ mds_rank_t from;
+public:
+ map<client_t,entity_inst_t> imported_client_map;
+ map<client_t,uint64_t> sseqmap;
+
+ C_MDS_ImportDirLoggedStart(Migrator *m, CDir *d, mds_rank_t f) :
+ MigratorLogContext(m), df(d->dirfrag()), dir(d), from(f) {
+ }
+ void finish(int r) override {
+ mig->import_logged_start(df, dir, from, imported_client_map, sseqmap);
+ }
+};
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_dir(MExportDir *m)
+{
+ assert (g_conf->mds_kill_import_at != 5);
+ CDir *dir = cache->get_dirfrag(m->dirfrag);
+ assert(dir);
+
+ mds_rank_t oldauth = mds_rank_t(m->get_source().num());
+ dout(7) << "handle_export_dir importing " << *dir << " from " << oldauth << dendl;
+
+ assert(!dir->is_auth());
+
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(m->dirfrag);
+ assert(it != import_state.end());
+ assert(it->second.state == IMPORT_PREPPED);
+ assert(it->second.tid == m->get_tid());
+ assert(it->second.peer == oldauth);
+
+ utime_t now = ceph_clock_now();
+
+ if (!dir->get_inode()->dirfragtree.is_leaf(dir->get_frag()))
+ dir->get_inode()->dirfragtree.force_to_leaf(g_ceph_context, dir->get_frag());
+
+ cache->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_)
+ cache->adjust_subtree_auth(dir, mds->get_nodeid(), oldauth);
+
+ // new client sessions, open these after we journal
+ // include imported sessions in EImportStart
+ bufferlist::iterator cmp = m->client_map.begin();
+ ::decode(onlogged->imported_client_map, cmp);
+ assert(cmp.end());
+ le->cmapv = mds->server->prepare_force_open_sessions(onlogged->imported_client_map, onlogged->sseqmap);
+ le->client_map.claim(m->client_map);
+
+ bufferlist::iterator blp = m->export_data.begin();
+ int num_imported_inodes = 0;
+ while (!blp.end()) {
+ num_imported_inodes +=
+ decode_import_dir(blp,
+ oldauth,
+ dir, // import root
+ le,
+ mds->mdlog->get_current_segment(),
+ it->second.peer_exports,
+ it->second.updated_scatterlocks,
+ now);
+ }
+ dout(10) << " " << m->bounds.size() << " imported bounds" << dendl;
+
+ // include bounds in EImportStart
+ set<CDir*> import_bounds;
+ for (vector<dirfrag_t>::iterator p = m->bounds.begin();
+ p != m->bounds.end();
+ ++p) {
+ CDir *bd = cache->get_dirfrag(*p);
+ assert(bd);
+ le->metablob.add_dir(bd, false); // note that parent metadata is already in the event
+ import_bounds.insert(bd);
+ }
+ cache->verify_subtree_bounds(dir, import_bounds);
+
+ // adjust popularity
+ mds->balancer->add_import(dir, now);
+
+ dout(7) << "handle_export_dir did " << *dir << dendl;
+
+ // note state
+ it->second.state = IMPORT_LOGGINGSTART;
+ 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);
+ }
+
+ m->put();
+}
+
+
+/*
+ * 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 = cache->get_inode(p->ino);
+ 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) {
+ assert(bd->state_test(CDir::STATE_IMPORTBOUND));
+ bd->put(CDir::PIN_IMPORTBOUND);
+ bd->state_clear(CDir::STATE_IMPORTBOUND);
+ }
+ }
+}
+
+
+/*
+ * 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) << "import_reverse " << *dir << dendl;
+
+ import_state_t& stat = import_state[dir->dirfrag()];
+ stat.state = IMPORT_ABORTING;
+
+ set<CDir*> bounds;
+ cache->get_subtree_bounds(dir, bounds);
+
+ // remove pins
+ import_remove_pins(dir, bounds);
+
+ // update auth, with possible subtree merge.
+ assert(dir->is_subtree_root());
+ if (mds->is_resolve())
+ cache->trim_non_auth_subtree(dir);
+
+ cache->adjust_subtree_auth(dir, stat.peer);
+
+ C_ContextsBase<MDSInternalContextBase, MDSInternalContextGather> *fin = new C_ContextsBase<MDSInternalContextBase, MDSInternalContextGather>(g_ceph_context);
+ 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.
+ list<CDir*> q;
+ q.push_back(dir);
+ while (!q.empty()) {
+ CDir *cur = q.front();
+ q.pop_front();
+
+ // dir
+ assert(cur->is_auth());
+ cur->state_clear(CDir::STATE_AUTH);
+ cur->remove_bloom();
+ cur->clear_replica_map();
+ cur->set_replica_nonce(CDir::EXPORT_NONCE);
+ if (cur->is_dirty())
+ cur->mark_clean();
+
+ CDir::map_t::iterator it;
+ for (it = cur->begin(); it != cur->end(); ++it) {
+ CDentry *dn = it->second;
+
+ // dentry
+ dn->state_clear(CDentry::STATE_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(CDentry::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->authlock.clear_gather();
+ in->linklock.clear_gather();
+ in->dirfragtreelock.clear_gather();
+ in->filelock.clear_gather();
+
+ in->clear_file_locks();
+
+ // non-bounding dir?
+ list<CDir*> dfs;
+ in->get_dirfrags(dfs);
+ for (list<CDir*>::iterator p = dfs.begin(); p != dfs.end(); ++p)
+ if (bounds.count(*p) == 0)
+ q.push_back(*p);
+ }
+
+ cache->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);
+ assert(cap);
+ if (cap->is_importing())
+ in->remove_client_cap(q->first);
+ }
+ in->put(CInode::PIN_IMPORTINGCAPS);
+ }
+ for (map<client_t,entity_inst_t>::iterator p = stat.client_map.begin();
+ p != stat.client_map.end();
+ ++p) {
+ Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(p->first.v));
+ assert(session);
+ session->dec_importing();
+ }
+ }
+
+ // log our failure
+ mds->mdlog->start_submit_entry(new EImportFinish(dir, false)); // log failure
+
+ cache->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) << "import_notify_finish " << *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) {
+ MExportDirNotify *notify =
+ new 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) << "import_notify_abort " << *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;
+ }
+ MExportDirNotify *notify =
+ new 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 {
+ assert (g_conf->mds_kill_import_at != 10);
+ }
+}
+
+void Migrator::import_reverse_unfreeze(CDir *dir)
+{
+ dout(7) << "import_reverse_unfreeze " << *dir << dendl;
+ assert(!dir->is_auth());
+ cache->discard_delayed_expire(dir);
+ dir->unfreeze_tree();
+ if (dir->is_subtree_root())
+ cache->try_subtree_merge(dir);
+ import_reverse_final(dir);
+}
+
+void Migrator::import_reverse_final(CDir *dir)
+{
+ dout(7) << "import_reverse_final " << *dir << dendl;
+
+ // clean up
+ map<dirfrag_t, import_state_t>::iterator it = import_state.find(dir->dirfrag());
+ assert(it != import_state.end());
+
+ MutationRef mut = it->second.mut;
+ import_state.erase(it);
+
+ // send pending import_maps?
+ mds->mdcache->maybe_send_pending_resolves();
+
+ if (mut) {
+ mds->locker->drop_locks(mut.get());
+ mut->cleanup();
+ }
+
+ cache->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,entity_inst_t>& imported_client_map,
+ map<client_t,uint64_t>& sseqmap)
+{
+ 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_client_map, sseqmap);
+ return;
+ }
+
+ dout(7) << "import_logged " << *dir << dendl;
+
+ // note state
+ it->second.state = IMPORT_ACKING;
+
+ assert (g_conf->mds_kill_import_at != 7);
+
+ // force open client sessions and finish cap import
+ mds->server->finish_force_open_sessions(imported_client_map, sseqmap, false);
+ it->second.client_map.swap(imported_client_map);
+
+ 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, p->second, imported_caps[p->first->ino()]);
+ }
+
+ // 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);
+
+ MExportDirAck *ack = new MExportDirAck(dir->dirfrag(), it->second.tid);
+ ::encode(imported_caps, ack->imported_caps);
+
+ mds->send_message_mds(ack, from);
+ assert (g_conf->mds_kill_import_at != 8);
+
+ cache->show_subtrees();
+}
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_finish(MExportDirFinish *m)
+{
+ CDir *dir = cache->get_dirfrag(m->get_dirfrag());
+ assert(dir);
+ dout(7) << "handle_export_finish on " << *dir << (m->is_last() ? " last" : "") << dendl;
+
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(m->get_dirfrag());
+ assert(it != import_state.end());
+ assert(it->second.tid == m->get_tid());
+
+ import_finish(dir, false, m->is_last());
+
+ m->put();
+}
+
+void Migrator::import_finish(CDir *dir, bool notify, bool last)
+{
+ dout(7) << "import_finish on " << *dir << dendl;
+
+ map<dirfrag_t,import_state_t>::iterator it = import_state.find(dir->dirfrag());
+ assert(it != import_state.end());
+ assert(it->second.state == IMPORT_ACKING || it->second.state == IMPORT_FINISHING);
+
+ if (it->second.state == IMPORT_ACKING) {
+ assert(dir->is_auth());
+ cache->adjust_subtree_auth(dir, mds->get_nodeid(), mds->get_nodeid());
+ }
+
+ // log finish
+ 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;
+ assert(in->is_auth());
+ for (map<client_t,Capability::Export>::iterator q = p->second.begin();
+ q != p->second.end();
+ ++q) {
+ Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(q->first.v));
+ assert(session);
+ Capability *cap = in->get_client_cap(q->first);
+ assert(cap);
+ cap->merge(q->second, true);
+ cap->clear_importing();
+ mds->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 (map<client_t,entity_inst_t>::iterator p = it->second.client_map.begin();
+ p != it->second.client_map.end();
+ ++p) {
+ Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(p->first.v));
+ assert(session);
+ session->dec_importing();
+ }
+ }
+
+ if (!last) {
+ assert(it->second.state == IMPORT_ACKING);
+ it->second.state = IMPORT_FINISHING;
+ return;
+ }
+
+ // remove pins
+ set<CDir*> bounds;
+ cache->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
+ cache->process_delayed_expire(dir);
+
+ // unfreeze tree, with possible subtree merge.
+ dir->unfreeze_tree();
+ cache->try_subtree_merge(dir);
+
+ cache->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?
+ mds->mdcache->maybe_send_pending_resolves();
+
+ // did i just import mydir?
+ if (dir->ino() == MDS_INO_MDSDIR(mds->get_nodeid()))
+ cache->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::iterator& blp,
+ mds_rank_t oldauth, LogSegment *ls,
+ map<CInode*, map<client_t,Capability::Export> >& peer_exports,
+ list<ScatterLock*>& updated_scatterlocks)
+{
+ dout(15) << "decode_import_inode on " << *dn << dendl;
+
+ inodeno_t ino;
+ snapid_t last;
+ ::decode(ino, blp);
+ ::decode(last, blp);
+
+ bool added = false;
+ CInode *in = cache->get_inode(ino, last);
+ if (!in) {
+ in = new CInode(mds->mdcache, true, 1, 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);
+
+ // link before state -- or not! -sage
+ if (dn->get_linkage()->get_inode() != in) {
+ assert(!dn->get_linkage()->get_inode());
+ dn->dir->link_primary_inode(dn, in);
+ }
+
+ // add inode?
+ if (added) {
+ cache->add_inode(in);
+ dout(10) << "added " << *in << dendl;
+ } else {
+ dout(10) << " had " << *in << dendl;
+ }
+
+ if (in->inode.is_dirty_rstat())
+ in->mark_dirty_rstat();
+
+ // 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());
+}
+
+void Migrator::decode_import_inode_caps(CInode *in, bool auth_cap,
+ bufferlist::iterator &blp,
+ map<CInode*, map<client_t,Capability::Export> >& peer_exports)
+{
+ map<client_t,Capability::Export> cap_map;
+ ::decode(cap_map, blp);
+ if (auth_cap)
+ ::decode(in->get_mds_caps_wanted(), blp);
+ if (!cap_map.empty() ||
+ (auth_cap && !in->get_mds_caps_wanted().empty())) {
+ peer_exports[in].swap(cap_map);
+ in->get(CInode::PIN_IMPORTINGCAPS);
+ }
+}
+
+void Migrator::finish_import_inode_caps(CInode *in, mds_rank_t peer, bool auth_cap,
+ map<client_t,Capability::Export> &export_map,
+ map<client_t,Capability::Import> &import_map)
+{
+ for (map<client_t,Capability::Export>::iterator it = export_map.begin();
+ it != export_map.end();
+ ++it) {
+ dout(10) << "finish_import_inode_caps for client." << it->first << " on " << *in << dendl;
+ Session *session = mds->sessionmap.get_session(entity_name_t::CLIENT(it->first.v));
+ assert(session);
+
+ Capability *cap = in->get_client_cap(it->first);
+ if (!cap) {
+ cap = in->add_client_cap(it->first, session);
+ if (peer < 0)
+ cap->mark_importing();
+ }
+
+ 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);
+ mds->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 (peer >= 0) {
+ in->replica_caps_wanted = 0;
+ in->put(CInode::PIN_IMPORTINGCAPS);
+ }
+}
+
+int Migrator::decode_import_dir(bufferlist::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, utime_t now)
+{
+ // set up dir
+ dirfrag_t df;
+ ::decode(df, blp);
+
+ CInode *diri = cache->get_inode(df.ino);
+ assert(diri);
+ CDir *dir = diri->get_or_open_dirfrag(mds->mdcache, df.frag);
+ assert(dir);
+
+ dout(7) << "decode_import_dir " << *dir << dendl;
+
+ // assimilate state
+ dir->decode_import(blp, now, 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);
+
+ int num_imported = 0;
+
+ // 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.
+ list<MDSInternalContextBase*> waiters;
+
+ dir->take_waiting(CDir::WAIT_ANY_MASK, waiters);
+ for (list<MDSInternalContextBase*>::iterator it = waiters.begin();
+ it != waiters.end();
+ ++it)
+ import_root->add_waiter(CDir::WAIT_UNFREEZE, *it); // 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) << "decode_import_dir got " << *dn << dendl;
+
+ // points to...
+ char icode;
+ ::decode(icode, blp);
+
+ if (icode == 'N') {
+ // null dentry
+ assert(dn->get_linkage()->is_null());
+
+ // fall thru
+ }
+ else if (icode == 'L') {
+ // remote link
+ inodeno_t ino;
+ unsigned char d_type;
+ ::decode(ino, blp);
+ ::decode(d_type, blp);
+ if (dn->get_linkage()->is_remote()) {
+ assert(dn->get_linkage()->get_remote_ino() == ino);
+ } else {
+ dir->link_remote_inode(dn, ino, d_type);
+ }
+ }
+ else if (icode == 'I') {
+ // inode
+ assert(le);
+ 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) << "decode_import_dir done " << *dir << dendl;
+ return num_imported;
+}
+
+
+
+
+
+// authority bystander
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_notify(MExportDirNotify *m)
+{
+ if (!(mds->is_clientreplay() || mds->is_active() || mds->is_stopping())) {
+ m->put();
+ return;
+ }
+
+ CDir *dir = cache->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) << "handle_export_notify " << old_auth << " -> " << new_auth
+ << " on missing dir " << m->get_dirfrag() << dendl;
+ } else if (dir->authority() != old_auth) {
+ dout(7) << "handle_export_notify old_auth was " << dir->authority()
+ << " != " << old_auth << " -> " << new_auth
+ << " on " << *dir << dendl;
+ } else {
+ dout(7) << "handle_export_notify " << old_auth << " -> " << new_auth
+ << " on " << *dir << dendl;
+ // adjust auth
+ set<CDir*> have;
+ cache->map_dirfrag_set(m->get_bounds(), have);
+ cache->adjust_bounded_subtree_auth(dir, have, new_auth);
+
+ // induce a merge?
+ cache->try_subtree_merge(dir);
+ }
+
+ // send ack
+ if (m->wants_ack()) {
+ mds->send_message_mds(new MExportDirNotifyAck(m->get_dirfrag(), m->get_tid(), m->get_new_auth()), from);
+ } else {
+ // aborted. no ack.
+ dout(7) << "handle_export_notify no ack requested" << dendl;
+ }
+
+ m->put();
+}
+
+/** cap exports **/
+void Migrator::export_caps(CInode *in)
+{
+ mds_rank_t dest = in->authority().first;
+ dout(7) << "export_caps to mds." << dest << " " << *in << dendl;
+
+ assert(in->is_any_caps());
+ assert(!in->is_auth());
+ assert(!in->is_ambiguous_auth());
+ assert(!in->state_test(CInode::STATE_EXPORTINGCAPS));
+
+ MExportCaps *ex = new MExportCaps;
+ ex->ino = in->ino();
+
+ encode_export_inode_caps(in, false, ex->cap_bl, ex->client_map);
+
+ mds->send_message_mds(ex, dest);
+}
+
+void Migrator::handle_gather_caps(MGatherCaps *m)
+{
+ CInode *in = cache->get_inode(m->ino);
+
+ if (!in)
+ goto out;
+
+ dout(10) << "handle_gather_caps " << *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);
+
+out:
+ m->put();
+}
+
+class C_M_LoggedImportCaps : public MigratorLogContext {
+ CInode *in;
+ mds_rank_t from;
+public:
+ map<CInode*, map<client_t,Capability::Export> > peer_exports;
+ map<client_t,entity_inst_t> client_map;
+ map<client_t,uint64_t> sseqmap;
+
+ 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, peer_exports, client_map, sseqmap);
+ }
+};
+
+/* This function DOES put the passed message before returning*/
+void Migrator::handle_export_caps(MExportCaps *ex)
+{
+ dout(10) << "handle_export_caps " << *ex << " from " << ex->get_source() << dendl;
+ CInode *in = cache->get_inode(ex->ino);
+
+ assert(in);
+ assert(in->is_auth());
+
+ // FIXME
+ if (!in->can_auth_pin())
+ return;
+ in->auth_pin(this);
+
+ C_M_LoggedImportCaps *finish = new C_M_LoggedImportCaps(
+ this, in, mds_rank_t(ex->get_source().num()));
+ finish->client_map = ex->client_map;
+
+ // decode new caps
+ bufferlist::iterator blp = ex->cap_bl.begin();
+ decode_import_inode_caps(in, false, blp, finish->peer_exports);
+ assert(!finish->peer_exports.empty()); // thus, inode is pinned.
+
+ // journal open client sessions
+ version_t pv = mds->server->prepare_force_open_sessions(finish->client_map, finish->sseqmap);
+
+ ESessions *le = new ESessions(pv, ex->client_map);
+ mds->mdlog->start_submit_entry(le, finish);
+ mds->mdlog->flush();
+
+ ex->put();
+}
+
+
+void Migrator::logged_import_caps(CInode *in,
+ mds_rank_t from,
+ map<CInode*, map<client_t,Capability::Export> >& peer_exports,
+ map<client_t,entity_inst_t>& client_map,
+ map<client_t,uint64_t>& sseqmap)
+{
+ dout(10) << "logged_import_caps on " << *in << dendl;
+ // see export_go() vs export_go_synced()
+ assert(in->is_auth());
+
+ // force open client sessions and finish cap import
+ mds->server->finish_force_open_sessions(client_map, sseqmap);
+
+ map<client_t,Capability::Import> imported_caps;
+
+ assert(peer_exports.count(in));
+ // clients will release caps from the exporter when they receive the cap import message.
+ finish_import_inode_caps(in, from, false, peer_exports[in], imported_caps);
+ mds->locker->eval(in, CEPH_CAP_LOCKS, true);
+ in->auth_unpin(this);
+}
Code Review / stor4nfv.git / blobdiff