X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fmds%2FMigrator.h;fp=src%2Fceph%2Fsrc%2Fmds%2FMigrator.h;h=d14561920a41f35829cd6d2d9afd211f0d7782d0;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git diff --git a/src/ceph/src/mds/Migrator.h b/src/ceph/src/mds/Migrator.h new file mode 100644 index 0000000..d145619 --- /dev/null +++ b/src/ceph/src/mds/Migrator.h @@ -0,0 +1,350 @@ +// -*- 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 + * + * 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. + * + * Handles the import and export of mds authorities and actual cache data. + * See src/doc/exports.txt for a description. + */ + +#ifndef CEPH_MDS_MIGRATOR_H +#define CEPH_MDS_MIGRATOR_H + +#include "include/types.h" + +#include +#include +#include +using std::map; +using std::list; +using std::set; + + +class MDSRank; +class CDir; +class CInode; +class CDentry; + +class MExportDirDiscover; +class MExportDirDiscoverAck; +class MExportDirCancel; +class MExportDirPrep; +class MExportDirPrepAck; +class MExportDir; +class MExportDirAck; +class MExportDirNotify; +class MExportDirNotifyAck; +class MExportDirFinish; + +class MExportCaps; +class MExportCapsAck; +class MGatherCaps; + +class EImportStart; + +class Migrator { +public: + // export stages. used to clean up intelligently if there's a failure. + const static int EXPORT_CANCELLED = 0; // cancelled + const static int EXPORT_CANCELLING = 1; // waiting for cancel notifyacks + const static int EXPORT_LOCKING = 2; // acquiring locks + const static int EXPORT_DISCOVERING = 3; // dest is disovering export dir + const static int EXPORT_FREEZING = 4; // we're freezing the dir tree + const static int EXPORT_PREPPING = 5; // sending dest spanning tree to export bounds + const static int EXPORT_WARNING = 6; // warning bystanders of dir_auth_pending + const static int EXPORT_EXPORTING = 7; // sent actual export, waiting for ack + const static int EXPORT_LOGGINGFINISH = 8; // logging EExportFinish + const static int EXPORT_NOTIFYING = 9; // waiting for notifyacks + static const char *get_export_statename(int s) { + switch (s) { + case EXPORT_CANCELLING: return "cancelling"; + case EXPORT_LOCKING: return "locking"; + case EXPORT_DISCOVERING: return "discovering"; + case EXPORT_FREEZING: return "freezing"; + case EXPORT_PREPPING: return "prepping"; + case EXPORT_WARNING: return "warning"; + case EXPORT_EXPORTING: return "exporting"; + case EXPORT_LOGGINGFINISH: return "loggingfinish"; + case EXPORT_NOTIFYING: return "notifying"; + default: ceph_abort(); return 0; + } + } + + // -- imports -- + const static int IMPORT_DISCOVERING = 1; // waiting for prep + const static int IMPORT_DISCOVERED = 2; // waiting for prep + const static int IMPORT_PREPPING = 3; // opening dirs on bounds + const static int IMPORT_PREPPED = 4; // opened bounds, waiting for import + const static int IMPORT_LOGGINGSTART = 5; // got import, logging EImportStart + const static int IMPORT_ACKING = 6; // logged EImportStart, sent ack, waiting for finish + const static int IMPORT_FINISHING = 7; // sent cap imports, waiting for finish + const static int IMPORT_ABORTING = 8; // notifying bystanders of an abort before unfreezing + static const char *get_import_statename(int s) { + switch (s) { + case IMPORT_DISCOVERING: return "discovering"; + case IMPORT_DISCOVERED: return "discovered"; + case IMPORT_PREPPING: return "prepping"; + case IMPORT_PREPPED: return "prepped"; + case IMPORT_LOGGINGSTART: return "loggingstart"; + case IMPORT_ACKING: return "acking"; + case IMPORT_FINISHING: return "finishing"; + case IMPORT_ABORTING: return "aborting"; + default: ceph_abort(); return 0; + } + } + + // -- cons -- + Migrator(MDSRank *m, MDCache *c) : mds(m), cache(c) {} + + + +protected: + // export fun + struct export_state_t { + int state; + mds_rank_t peer; + uint64_t tid; + set warning_ack_waiting; + set notify_ack_waiting; + map > peer_imported; + MutationRef mut; + // for freeze tree deadlock detection + utime_t last_cum_auth_pins_change; + int last_cum_auth_pins; + int num_remote_waiters; // number of remote authpin waiters + export_state_t() : state(0), peer(0), tid(0), mut(), + last_cum_auth_pins(0), num_remote_waiters(0) {} + }; + + map export_state; + + list > export_queue; + + // import fun + struct import_state_t { + int state; + mds_rank_t peer; + uint64_t tid; + set bystanders; + list bound_ls; + list updated_scatterlocks; + map client_map; + map > peer_exports; + MutationRef mut; + import_state_t() : state(0), peer(0), tid(0), mut() {} + }; + + map import_state; + + void handle_export_discover_ack(MExportDirDiscoverAck *m); + void export_frozen(CDir *dir, uint64_t tid); + void handle_export_prep_ack(MExportDirPrepAck *m); + void export_sessions_flushed(CDir *dir, uint64_t tid); + void export_go(CDir *dir); + void export_go_synced(CDir *dir, uint64_t tid); + void export_try_cancel(CDir *dir, bool notify_peer=true); + void export_cancel_finish(CDir *dir); + void export_reverse(CDir *dir); + void export_notify_abort(CDir *dir, set& bounds); + void handle_export_ack(MExportDirAck *m); + void export_logged_finish(CDir *dir); + void handle_export_notify_ack(MExportDirNotifyAck *m); + void export_finish(CDir *dir); + + void handle_gather_caps(MGatherCaps *m); + + friend class C_MDC_ExportFreeze; + friend class C_MDS_ExportFinishLogged; + friend class C_M_ExportGo; + friend class C_M_ExportSessionsFlushed; + friend class MigratorContext; + friend class MigratorLogContext; + + // importer + void handle_export_discover(MExportDirDiscover *m); + void handle_export_cancel(MExportDirCancel *m); + void handle_export_prep(MExportDirPrep *m); + void handle_export_dir(MExportDir *m); + + void import_reverse_discovering(dirfrag_t df); + void import_reverse_discovered(dirfrag_t df, CInode *diri); + void import_reverse_prepping(CDir *dir); + void import_remove_pins(CDir *dir, set& bounds); + void import_reverse_unfreeze(CDir *dir); + void import_reverse_final(CDir *dir); + void import_notify_abort(CDir *dir, set& bounds); + void import_notify_finish(CDir *dir, set& bounds); + void import_logged_start(dirfrag_t df, CDir *dir, mds_rank_t from, + map &imported_client_map, + map& sseqmap); + void handle_export_finish(MExportDirFinish *m); + + void handle_export_caps(MExportCaps *m); + void logged_import_caps(CInode *in, + mds_rank_t from, + map >& cap_imports, + map& client_map, + map& sseqmap); + + + friend class C_MDS_ImportDirLoggedStart; + friend class C_MDS_ImportDirLoggedFinish; + friend class C_M_LoggedImportCaps; + + // bystander + void handle_export_notify(MExportDirNotify *m); + + +public: + + void dispatch(Message*); + + void show_importing(); + void show_exporting(); + + int get_num_exporting() const { return export_state.size(); } + int get_export_queue_size() const { return export_queue.size(); } + + // -- status -- + int is_exporting(CDir *dir) const { + map::const_iterator it = export_state.find(dir); + if (it != export_state.end()) return it->second.state; + return 0; + } + bool is_exporting() const { return !export_state.empty(); } + int is_importing(dirfrag_t df) const { + map::const_iterator it = import_state.find(df); + if (it != import_state.end()) return it->second.state; + return 0; + } + bool is_importing() const { return !import_state.empty(); } + + bool is_ambiguous_import(dirfrag_t df) const { + map::const_iterator p = import_state.find(df); + if (p == import_state.end()) + return false; + if (p->second.state >= IMPORT_LOGGINGSTART && + p->second.state < IMPORT_ABORTING) + return true; + return false; + } + + int get_import_state(dirfrag_t df) const { + map::const_iterator it = import_state.find(df); + assert(it != import_state.end()); + return it->second.state; + } + int get_import_peer(dirfrag_t df) const { + map::const_iterator it = import_state.find(df); + assert(it != import_state.end()); + return it->second.peer; + } + + int get_export_state(CDir *dir) const { + map::const_iterator it = export_state.find(dir); + assert(it != export_state.end()); + return it->second.state; + } + // this returns true if we are export @dir, + // and are not waiting for @who to be + // be warned of ambiguous auth. + // only returns meaningful results during EXPORT_WARNING state. + bool export_has_warned(CDir *dir, mds_rank_t who) { + map::iterator it = export_state.find(dir); + assert(it != export_state.end()); + assert(it->second.state == EXPORT_WARNING); + return (it->second.warning_ack_waiting.count(who) == 0); + } + + bool export_has_notified(CDir *dir, mds_rank_t who) const { + map::const_iterator it = export_state.find(dir); + assert(it != export_state.end()); + assert(it->second.state == EXPORT_NOTIFYING); + return (it->second.notify_ack_waiting.count(who) == 0); + } + + void export_freeze_inc_num_waiters(CDir *dir) { + map::iterator it = export_state.find(dir); + assert(it != export_state.end()); + it->second.num_remote_waiters++; + } + void find_stale_export_freeze(); + + // -- misc -- + void handle_mds_failure_or_stop(mds_rank_t who); + + void audit(); + + // -- import/export -- + // exporter + void dispatch_export_dir(MDRequestRef& mdr, int count); + void export_dir(CDir *dir, mds_rank_t dest); + void export_empty_import(CDir *dir); + + void export_dir_nicely(CDir *dir, mds_rank_t dest); + void maybe_do_queued_export(); + void clear_export_queue() { + export_queue.clear(); + } + + void get_export_lock_set(CDir *dir, set& locks); + void get_export_client_set(CDir *dir, set &client_set); + void get_export_client_set(CInode *in, set &client_set); + + void encode_export_inode(CInode *in, bufferlist& bl, + map& exported_client_map); + void encode_export_inode_caps(CInode *in, bool auth_cap, bufferlist& bl, + map& exported_client_map); + void finish_export_inode(CInode *in, utime_t now, mds_rank_t target, + map& peer_imported, + list& finished); + void finish_export_inode_caps(CInode *in, mds_rank_t target, + map& peer_imported); + + + uint64_t encode_export_dir(bufferlist& exportbl, + CDir *dir, + map& exported_client_map, + utime_t now); + void finish_export_dir(CDir *dir, utime_t now, mds_rank_t target, + map >& peer_imported, + list& finished, int *num_dentries); + + void clear_export_proxy_pins(CDir *dir); + + void export_caps(CInode *in); + + void decode_import_inode(CDentry *dn, bufferlist::iterator& blp, + mds_rank_t oldauth, LogSegment *ls, + map >& cap_imports, + list& updated_scatterlocks); + void decode_import_inode_caps(CInode *in, bool auth_cap, bufferlist::iterator &blp, + map >& cap_imports); + void finish_import_inode_caps(CInode *in, mds_rank_t from, bool auth_cap, + map &export_map, + map &import_map); + int decode_import_dir(bufferlist::iterator& blp, + mds_rank_t oldauth, + CDir *import_root, + EImportStart *le, + LogSegment *ls, + map >& cap_imports, + list& updated_scatterlocks, utime_t now); + + void import_reverse(CDir *dir); + + void import_finish(CDir *dir, bool notify, bool last=true); + +private: + MDSRank *mds; + MDCache *cache; +}; + +#endif