+++ /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