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Diffstat (limited to 'src/mds/Locker.h')
| -rw-r--r-- | src/mds/Locker.h | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/src/mds/Locker.h b/src/mds/Locker.h new file mode 100644 index 00000000..c4dd65ee --- /dev/null +++ b/src/mds/Locker.h @@ -0,0 +1,291 @@ +// -*- 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. + * + */ + +#ifndef CEPH_MDS_LOCKER_H +#define CEPH_MDS_LOCKER_H + +#include "include/types.h" + +#include "messages/MClientCaps.h" +#include "messages/MClientCapRelease.h" +#include "messages/MClientLease.h" +#include "messages/MLock.h" + +#include <map> +#include <list> +#include <set> +#include <string_view> + +class MDSRank; +class Session; +class CDentry; +struct SnapRealm; + +class Capability; + +class SimpleLock; +class ScatterLock; +class LocalLock; + +#include "CInode.h" +#include "SimpleLock.h" +#include "MDSContext.h" +#include "Mutation.h" +#include "messages/MClientReply.h" + +class Locker { +private: + MDSRank *mds; + MDCache *mdcache; + + public: + Locker(MDSRank *m, MDCache *c); + + SimpleLock *get_lock(int lock_type, const MDSCacheObjectInfo &info); + + void dispatch(const Message::const_ref &m); + void handle_lock(const MLock::const_ref &m); + + void tick(); + + void nudge_log(SimpleLock *lock); + +protected: + void send_lock_message(SimpleLock *lock, int msg); + void send_lock_message(SimpleLock *lock, int msg, const bufferlist &data); + + // -- locks -- + void _drop_locks(MutationImpl *mut, std::set<CInode*> *pneed_issue, bool drop_rdlocks); +public: + void include_snap_rdlocks(CInode *in, MutationImpl::LockOpVec& lov); + void include_snap_rdlocks_wlayout(CInode *in, MutationImpl::LockOpVec& lov, + file_layout_t **layout); + + bool acquire_locks(MDRequestRef& mdr, + MutationImpl::LockOpVec& lov, + CInode *auth_pin_freeze=NULL, + bool auth_pin_nonblock=false); + + void notify_freeze_waiter(MDSCacheObject *o); + void cancel_locking(MutationImpl *mut, std::set<CInode*> *pneed_issue); + void drop_locks(MutationImpl *mut, std::set<CInode*> *pneed_issue=0); + void set_xlocks_done(MutationImpl *mut, bool skip_dentry=false); + void drop_non_rdlocks(MutationImpl *mut, std::set<CInode*> *pneed_issue=0); + void drop_rdlocks_for_early_reply(MutationImpl *mut); + void drop_locks_for_fragment_unfreeze(MutationImpl *mut); + + void eval_gather(SimpleLock *lock, bool first=false, bool *need_issue=0, MDSContext::vec *pfinishers=0); + void eval(SimpleLock *lock, bool *need_issue); + void eval_any(SimpleLock *lock, bool *need_issue, MDSContext::vec *pfinishers=0, bool first=false) { + if (!lock->is_stable()) + eval_gather(lock, first, need_issue, pfinishers); + else if (lock->get_parent()->is_auth()) + eval(lock, need_issue); + } + + void eval_scatter_gathers(CInode *in); + + void eval_cap_gather(CInode *in, std::set<CInode*> *issue_set=0); + + bool eval(CInode *in, int mask, bool caps_imported=false); + void try_eval(MDSCacheObject *p, int mask); + void try_eval(SimpleLock *lock, bool *pneed_issue); + + bool _rdlock_kick(SimpleLock *lock, bool as_anon); + bool rdlock_try(SimpleLock *lock, client_t client, MDSContext *c); + bool rdlock_start(SimpleLock *lock, MDRequestRef& mut, bool as_anon=false); + void rdlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut, bool *pneed_issue); + bool can_rdlock_set(MutationImpl::LockOpVec& lov); + void rdlock_take_set(MutationImpl::LockOpVec& lov, MutationRef& mut); + + void wrlock_force(SimpleLock *lock, MutationRef& mut); + bool wrlock_start(SimpleLock *lock, MDRequestRef& mut, bool nowait=false); + void wrlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut, bool *pneed_issue); + + void remote_wrlock_start(SimpleLock *lock, mds_rank_t target, MDRequestRef& mut); + void remote_wrlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut); + + bool xlock_start(SimpleLock *lock, MDRequestRef& mut); + void _finish_xlock(SimpleLock *lock, client_t xlocker, bool *pneed_issue); + void xlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut, bool *pneed_issue); + + void xlock_export(const MutationImpl::lock_iterator& it, MutationImpl *mut); + void xlock_import(SimpleLock *lock); + + + // simple +public: + void try_simple_eval(SimpleLock *lock); + bool simple_rdlock_try(SimpleLock *lock, MDSContext *con); +protected: + void simple_eval(SimpleLock *lock, bool *need_issue); + void handle_simple_lock(SimpleLock *lock, const MLock::const_ref &m); + +public: + bool simple_sync(SimpleLock *lock, bool *need_issue=0); +protected: + void simple_lock(SimpleLock *lock, bool *need_issue=0); + void simple_excl(SimpleLock *lock, bool *need_issue=0); + void simple_xlock(SimpleLock *lock); + + + // scatter +public: + void scatter_eval(ScatterLock *lock, bool *need_issue); // public for MDCache::adjust_subtree_auth() + + void scatter_tick(); + void scatter_nudge(ScatterLock *lock, MDSContext *c, bool forcelockchange=false); + +protected: + void handle_scatter_lock(ScatterLock *lock, const MLock::const_ref &m); + bool scatter_scatter_fastpath(ScatterLock *lock); + void scatter_scatter(ScatterLock *lock, bool nowait=false); + void scatter_tempsync(ScatterLock *lock, bool *need_issue=0); + + void scatter_writebehind(ScatterLock *lock); + + void scatter_writebehind_finish(ScatterLock *lock, MutationRef& mut); + + xlist<ScatterLock*> updated_scatterlocks; +public: + void mark_updated_scatterlock(ScatterLock *lock); + + + void handle_reqrdlock(SimpleLock *lock, const MLock::const_ref &m); + + + + // caps + + // when to defer processing client cap release or writeback due to being + // frozen. the condition must be consistent across handle_client_caps and + // process_request_cap_release to preserve ordering. + bool should_defer_client_cap_frozen(CInode *in); + + void process_request_cap_release(MDRequestRef& mdr, client_t client, const ceph_mds_request_release& r, + std::string_view dname); + + void kick_cap_releases(MDRequestRef& mdr); + void kick_issue_caps(CInode *in, client_t client, ceph_seq_t seq); + + void remove_client_cap(CInode *in, Capability *cap, bool kill=false); + + void get_late_revoking_clients(std::list<client_t> *result, double timeout) const; + +private: + bool any_late_revoking_caps(xlist<Capability*> const &revoking, double timeout) const; + +protected: + bool _need_flush_mdlog(CInode *in, int wanted_caps); + void adjust_cap_wanted(Capability *cap, int wanted, int issue_seq); + void handle_client_caps(const MClientCaps::const_ref &m); + void _update_cap_fields(CInode *in, int dirty, const MClientCaps::const_ref &m, CInode::mempool_inode *pi); + void _do_snap_update(CInode *in, snapid_t snap, int dirty, snapid_t follows, client_t client, const MClientCaps::const_ref &m, const MClientCaps::ref &ack); + void _do_null_snapflush(CInode *head_in, client_t client, snapid_t last=CEPH_NOSNAP); + bool _do_cap_update(CInode *in, Capability *cap, int dirty, snapid_t follows, const MClientCaps::const_ref &m, + const MClientCaps::ref &ack, bool *need_flush=NULL); + void handle_client_cap_release(const MClientCapRelease::const_ref &m); + void _do_cap_release(client_t client, inodeno_t ino, uint64_t cap_id, ceph_seq_t mseq, ceph_seq_t seq); + void caps_tick(); + + // Maintain a global list to quickly find if any caps are late revoking + xlist<Capability*> revoking_caps; + // Maintain a per-client list to find clients responsible for late ones quickly + std::map<client_t, xlist<Capability*> > revoking_caps_by_client; + + elist<CInode*> need_snapflush_inodes; +public: + void snapflush_nudge(CInode *in); + void mark_need_snapflush_inode(CInode *in); + bool is_revoking_any_caps_from(client_t client); + + // local +public: + void local_wrlock_grab(LocalLock *lock, MutationRef& mut); +protected: + bool local_wrlock_start(LocalLock *lock, MDRequestRef& mut); + void local_wrlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut); + bool local_xlock_start(LocalLock *lock, MDRequestRef& mut); + void local_xlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut); + + + // file +public: + void file_eval(ScatterLock *lock, bool *need_issue); +protected: + void handle_file_lock(ScatterLock *lock, const MLock::const_ref &m); + void scatter_mix(ScatterLock *lock, bool *need_issue=0); + void file_excl(ScatterLock *lock, bool *need_issue=0); + void file_xsyn(SimpleLock *lock, bool *need_issue=0); + +public: + void file_recover(ScatterLock *lock); + +private: + xlist<ScatterLock*> updated_filelocks; +public: + void mark_updated_Filelock(ScatterLock *lock); + + // -- file i/o -- +public: + version_t issue_file_data_version(CInode *in); + Capability* issue_new_caps(CInode *in, int mode, Session *session, SnapRealm *conrealm, bool is_replay); + int issue_caps(CInode *in, Capability *only_cap=0); + void issue_caps_set(std::set<CInode*>& inset); + void issue_truncate(CInode *in); + void revoke_stale_cap(CInode *in, client_t client); + bool revoke_stale_caps(Session *session); + void resume_stale_caps(Session *session); + void remove_stale_leases(Session *session); + +public: + void request_inode_file_caps(CInode *in); +protected: + void handle_inode_file_caps(const MInodeFileCaps::const_ref &m); + + void file_update_finish(CInode *in, MutationRef& mut, unsigned flags, + client_t client, const MClientCaps::ref &ack); +private: + uint64_t calc_new_max_size(CInode::mempool_inode *pi, uint64_t size); +public: + void calc_new_client_ranges(CInode *in, uint64_t size, bool update, + CInode::mempool_inode::client_range_map* new_ranges, + bool *max_increased); + bool check_inode_max_size(CInode *in, bool force_wrlock=false, + uint64_t newmax=0, uint64_t newsize=0, + utime_t mtime=utime_t()); + void share_inode_max_size(CInode *in, Capability *only_cap=0); + +private: + friend class C_MDL_CheckMaxSize; + friend class C_MDL_RequestInodeFileCaps; + friend class C_Locker_FileUpdate_finish; + friend class C_Locker_RetryCapRelease; + friend class C_Locker_Eval; + friend class C_Locker_ScatterWB; + friend class LockerContext; + friend class LockerLogContext; + + + // -- client leases -- +public: + void handle_client_lease(const MClientLease::const_ref &m); + + void issue_client_lease(CDentry *dn, client_t client, bufferlist &bl, utime_t now, Session *session); + void revoke_client_leases(SimpleLock *lock); + static void encode_lease(bufferlist& bl, const session_info_t& info, const LeaseStat& ls); +}; + + +#endif |