--- /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.
+ *
+ */
+
+#ifndef CEPH_MDS_LOCKER_H
+#define CEPH_MDS_LOCKER_H
+
+#include "include/types.h"
+
+#include <map>
+#include <list>
+#include <set>
+using std::map;
+using std::list;
+using std::set;
+
+class MDSRank;
+class Session;
+class CInode;
+class CDentry;
+struct SnapRealm;
+
+class Message;
+
+class MLock;
+
+class Capability;
+
+class SimpleLock;
+class ScatterLock;
+class LocalLock;
+
+#include "SimpleLock.h"
+#include "Mutation.h"
+
+class Locker {
+private:
+ MDSRank *mds;
+ MDCache *mdcache;
+
+ public:
+ Locker(MDSRank *m, MDCache *c) : mds(m), mdcache(c) {}
+
+ SimpleLock *get_lock(int lock_type, MDSCacheObjectInfo &info);
+
+ void dispatch(Message *m);
+ void handle_lock(MLock *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_rdlocks(MutationImpl *mut, set<CInode*> *pneed_issue);
+ void _drop_non_rdlocks(MutationImpl *mut, set<CInode*> *pneed_issue);
+public:
+ void include_snap_rdlocks(set<SimpleLock*>& rdlocks, CInode *in);
+ void include_snap_rdlocks_wlayout(set<SimpleLock*>& rdlocks, CInode *in,
+ file_layout_t **layout);
+
+ bool acquire_locks(MDRequestRef& mdr,
+ set<SimpleLock*> &rdlocks,
+ set<SimpleLock*> &wrlocks,
+ set<SimpleLock*> &xlocks,
+ map<SimpleLock*,mds_rank_t> *remote_wrlocks=NULL,
+ CInode *auth_pin_freeze=NULL,
+ bool auth_pin_nonblock=false);
+
+ void notify_freeze_waiter(MDSCacheObject *o);
+ void cancel_locking(MutationImpl *mut, set<CInode*> *pneed_issue);
+ void drop_locks(MutationImpl *mut, set<CInode*> *pneed_issue=0);
+ void set_xlocks_done(MutationImpl *mut, bool skip_dentry=false);
+ void drop_non_rdlocks(MutationImpl *mut, set<CInode*> *pneed_issue=0);
+ void drop_rdlocks(MutationImpl *mut, set<CInode*> *pneed_issue=0);
+
+ void eval_gather(SimpleLock *lock, bool first=false, bool *need_issue=0, list<MDSInternalContextBase*> *pfinishers=0);
+ void eval(SimpleLock *lock, bool *need_issue);
+ void eval_any(SimpleLock *lock, bool *need_issue, list<MDSInternalContextBase*> *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, 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, MDSInternalContextBase *c);
+ bool rdlock_start(SimpleLock *lock, MDRequestRef& mut, bool as_anon=false);
+ void rdlock_finish(SimpleLock *lock, MutationImpl *mut, bool *pneed_issue);
+ bool can_rdlock_set(set<SimpleLock*>& locks);
+ bool rdlock_try_set(set<SimpleLock*>& locks);
+ void rdlock_take_set(set<SimpleLock*>& locks, MutationRef& mut);
+
+ void wrlock_force(SimpleLock *lock, MutationRef& mut);
+ bool wrlock_start(SimpleLock *lock, MDRequestRef& mut, bool nowait=false);
+ void wrlock_finish(SimpleLock *lock, MutationImpl *mut, bool *pneed_issue);
+
+ void remote_wrlock_start(SimpleLock *lock, mds_rank_t target, MDRequestRef& mut);
+ void remote_wrlock_finish(SimpleLock *lock, mds_rank_t target, MutationImpl *mut);
+
+ bool xlock_start(SimpleLock *lock, MDRequestRef& mut);
+ void _finish_xlock(SimpleLock *lock, client_t xlocker, bool *pneed_issue);
+ void xlock_finish(SimpleLock *lock, MutationImpl *mut, bool *pneed_issue);
+
+ void xlock_export(SimpleLock *lock, MutationImpl *mut);
+ void xlock_import(SimpleLock *lock);
+
+
+ // simple
+public:
+ void try_simple_eval(SimpleLock *lock);
+ bool simple_rdlock_try(SimpleLock *lock, MDSInternalContextBase *con);
+protected:
+ void simple_eval(SimpleLock *lock, bool *need_issue);
+ void handle_simple_lock(SimpleLock *lock, MLock *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, MDSInternalContextBase *c, bool forcelockchange=false);
+
+protected:
+ void handle_scatter_lock(ScatterLock *lock, MLock *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, MLock *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,
+ const string &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, client_t client);
+
+ void get_late_revoking_clients(std::list<client_t> *result) const;
+ bool any_late_revoking_caps(xlist<Capability*> const &revoking) 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(class MClientCaps *m);
+ void _update_cap_fields(CInode *in, int dirty, MClientCaps *m, inode_t *pi);
+ void _do_snap_update(CInode *in, snapid_t snap, int dirty, snapid_t follows, client_t client, MClientCaps *m, MClientCaps *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, MClientCaps *m,
+ MClientCaps *ack=0, bool *need_flush=NULL);
+ void handle_client_cap_release(class MClientCapRelease *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;
+
+ // local
+public:
+ void local_wrlock_grab(LocalLock *lock, MutationRef& mut);
+protected:
+ bool local_wrlock_start(LocalLock *lock, MDRequestRef& mut);
+ void local_wrlock_finish(LocalLock *lock, MutationImpl *mut);
+ bool local_xlock_start(LocalLock *lock, MDRequestRef& mut);
+ void local_xlock_finish(LocalLock *lock, MutationImpl *mut);
+
+
+ // file
+public:
+ void file_eval(ScatterLock *lock, bool *need_issue);
+protected:
+ void handle_file_lock(ScatterLock *lock, MLock *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);
+ bool issue_caps(CInode *in, Capability *only_cap=0);
+ void issue_caps_set(set<CInode*>& inset);
+ void issue_truncate(CInode *in);
+ void revoke_stale_caps(Session *session);
+ void revoke_stale_caps(Capability *cap);
+ 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(class MInodeFileCaps *m);
+
+ void file_update_finish(CInode *in, MutationRef& mut, bool share_max, bool issue_client_cap,
+ client_t client, MClientCaps *ack);
+private:
+ uint64_t calc_new_max_size(inode_t *pi, uint64_t size);
+public:
+ void calc_new_client_ranges(CInode *in, uint64_t size,
+ map<client_t, client_writeable_range_t>* 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(struct MClientLease *m);
+
+ void issue_client_lease(CDentry *dn, client_t client, bufferlist &bl, utime_t now, Session *session);
+ void revoke_client_leases(SimpleLock *lock);
+};
+
+
+#endif
Code Review / stor4nfv.git / blobdiff