Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 270 insertions, 0 deletions

diff --git a/src/mds/Locker.h b/src/mds/Locker.h
new file mode 100644
index 000000000..3aff8db0b
--- /dev/null
+++ b/src/mds/Locker.h
@@ -0,0 +1,270 @@
+// -*- 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 "CInode.h"
+#include "SimpleLock.h"
+#include "MDSContext.h"
+#include "Mutation.h"
+#include "messages/MClientReply.h"
+
+struct SnapRealm;
+
+class MDSRank;
+class Session;
+class CDentry;
+class Capability;
+class SimpleLock;
+class ScatterLock;
+class LocalLockC;
+
+class Locker {
+public:
+  Locker(MDSRank *m, MDCache *c);
+
+  SimpleLock *get_lock(int lock_type, const MDSCacheObjectInfo &info);
+  
+  void dispatch(const cref_t<Message> &m);
+  void handle_lock(const cref_t<MLock> &m);
+
+  void tick();
+
+  void nudge_log(SimpleLock *lock);
+
+  bool acquire_locks(MDRequestRef& mdr,
+		     MutationImpl::LockOpVec& lov,
+		     CInode *auth_pin_freeze=NULL,
+		     bool auth_pin_nonblocking=false);
+
+  bool try_rdlock_snap_layout(CInode *in, MDRequestRef& mdr,
+			      int n=0, bool want_layout=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);
+
+  int get_cap_bit_for_lock_cache(int op);
+  void create_lock_cache(MDRequestRef& mdr, CInode *diri, file_layout_t *dir_layout=nullptr);
+  bool find_and_attach_lock_cache(MDRequestRef& mdr, CInode *diri);
+  void invalidate_lock_caches(CDir *dir);
+  void invalidate_lock_caches(SimpleLock *lock);
+  void invalidate_lock_cache(MDLockCache *lock_cache);
+  void eval_lock_caches(Capability *cap);
+  void put_lock_cache(MDLockCache* lock_cache);
+
+  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);
+  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 rdlock_try_set(MutationImpl::LockOpVec& lov, MDRequestRef& mdr);
+  bool rdlock_try_set(MutationImpl::LockOpVec& lov, MutationRef& mut);
+
+  void wrlock_force(SimpleLock *lock, MutationRef& mut);
+  bool wrlock_try(SimpleLock *lock, const MutationRef& mut, client_t client=-1);
+  bool wrlock_start(const MutationImpl::LockOp &op, MDRequestRef& mut);
+  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);
+  void xlock_downgrade(SimpleLock *lock, MutationImpl *mut);
+
+  void try_simple_eval(SimpleLock *lock);
+  bool simple_rdlock_try(SimpleLock *lock, MDSContext *con);
+
+  bool simple_sync(SimpleLock *lock, bool *need_issue=0);
+
+   // scatter
+  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);
+
+  void mark_updated_scatterlock(ScatterLock *lock);
+
+  void handle_reqrdlock(SimpleLock *lock, const cref_t<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,
+				   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);
+
+  std::set<client_t> get_late_revoking_clients(double timeout) const;
+
+  void snapflush_nudge(CInode *in);
+  void mark_need_snapflush_inode(CInode *in);
+  bool is_revoking_any_caps_from(client_t client);
+
+  // local
+  void local_wrlock_grab(LocalLockC *lock, MutationRef& mut);
+
+  // file
+  void file_eval(ScatterLock *lock, bool *need_issue);
+  void file_recover(ScatterLock *lock);
+
+  void mark_updated_Filelock(ScatterLock *lock);
+
+  // -- file i/o --
+  version_t issue_file_data_version(CInode *in);
+  Capability* issue_new_caps(CInode *in, int mode, MDRequestRef& mdr, SnapRealm *conrealm);
+  int get_allowed_caps(CInode *in, Capability *cap, int &all_allowed,
+                       int &loner_allowed, int &xlocker_allowed);
+  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);
+
+  void request_inode_file_caps(CInode *in);
+
+  bool check_client_ranges(CInode *in, uint64_t size);
+  bool calc_new_client_ranges(CInode *in, uint64_t size,
+			      bool *max_increased=nullptr);
+  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);
+
+  // -- client leases --
+  void handle_client_lease(const cref_t<MClientLease> &m);
+
+  void issue_client_lease(CDentry *dn, CInode *in, MDRequestRef &mdr, utime_t now, bufferlist &bl);
+  void revoke_client_leases(SimpleLock *lock);
+  static void encode_lease(bufferlist& bl, const session_info_t& info, const LeaseStat& ls);
+
+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);
+
+  void simple_eval(SimpleLock *lock, bool *need_issue);
+  void handle_simple_lock(SimpleLock *lock, const cref_t<MLock> &m);
+
+  void simple_lock(SimpleLock *lock, bool *need_issue=0);
+  void simple_excl(SimpleLock *lock, bool *need_issue=0);
+  void simple_xlock(SimpleLock *lock);
+
+  void handle_scatter_lock(ScatterLock *lock, const cref_t<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);
+
+  bool _need_flush_mdlog(CInode *in, int wanted_caps, bool lock_state_any=false);
+  void adjust_cap_wanted(Capability *cap, int wanted, int issue_seq);
+  void handle_client_caps(const cref_t<MClientCaps> &m);
+  void _update_cap_fields(CInode *in, int dirty, const cref_t<MClientCaps> &m, CInode::mempool_inode *pi);
+  void _do_snap_update(CInode *in, snapid_t snap, int dirty, snapid_t follows, client_t client, const cref_t<MClientCaps> &m, const ref_t<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, const cref_t<MClientCaps> &m,
+		      const ref_t<MClientCaps> &ack, bool *need_flush=NULL);
+  void handle_client_cap_release(const cref_t<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();
+
+  bool local_wrlock_start(LocalLockC *lock, MDRequestRef& mut);
+  void local_wrlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut);
+  bool local_xlock_start(LocalLockC *lock, MDRequestRef& mut);
+  void local_xlock_finish(const MutationImpl::lock_iterator& it, MutationImpl *mut);
+
+  void handle_file_lock(ScatterLock *lock, const cref_t<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);
+
+  void handle_inode_file_caps(const cref_t<MInodeFileCaps> &m);
+
+  void file_update_finish(CInode *in, MutationRef& mut, unsigned flags,
+			  client_t client, const ref_t<MClientCaps> &ack);
+
+  xlist<ScatterLock*> updated_scatterlocks;
+
+  // 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;
+
+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;
+
+  bool any_late_revoking_caps(xlist<Capability*> const &revoking, double timeout) const;
+  uint64_t calc_new_max_size(const CInode::inode_const_ptr& pi, uint64_t size);
+
+  MDSRank *mds;
+  MDCache *mdcache;
+  xlist<ScatterLock*> updated_filelocks;
+};
+#endif