[ceph.git] / ceph / src / mds / CDentry.h

// -*- 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_CDENTRY_H
#define CEPH_CDENTRY_H

#include <string>
#include <string_view>
#include <set>

#include "include/counter.h"
#include "include/types.h"
#include "include/buffer_fwd.h"
#include "include/lru.h"
#include "include/elist.h"
#include "include/filepath.h"

#include "BatchOp.h"
#include "MDSCacheObject.h"
#include "MDSContext.h"
#include "SimpleLock.h"
#include "LocalLock.h"
#include "ScrubHeader.h"

class CInode;
class CDir;
class Locker;
class CDentry;
class LogSegment;

class Session;

// define an ordering
bool operator<(const CDentry& l, const CDentry& r);

// dentry
class CDentry : public MDSCacheObject, public LRUObject, public Counter<CDentry> {
public:
  MEMPOOL_CLASS_HELPERS();
  friend class CDir;

  struct linkage_t {
    CInode *inode = nullptr;
    inodeno_t remote_ino = 0;
    unsigned char remote_d_type = 0;
    
    linkage_t() {}

    // dentry type is primary || remote || null
    // inode ptr is required for primary, optional for remote, undefined for null
    bool is_primary() const { return remote_ino == 0 && inode != 0; }
    bool is_remote() const { return remote_ino > 0; }
    bool is_null() const { return remote_ino == 0 && inode == 0; }

    CInode *get_inode() { return inode; }
    const CInode *get_inode() const { return inode; }
    inodeno_t get_remote_ino() const { return remote_ino; }
    unsigned char get_remote_d_type() const { return remote_d_type; }
    std::string get_remote_d_type_string() const;

    void set_remote(inodeno_t ino, unsigned char d_type) { 
      remote_ino = ino;
      remote_d_type = d_type;
      inode = 0;
    }
    void link_remote(CInode *in);
  };


  // -- state --
  static const int STATE_NEW =          (1<<0);
  static const int STATE_FRAGMENTING =  (1<<1);
  static const int STATE_PURGING =      (1<<2);
  static const int STATE_BADREMOTEINO = (1<<3);
  static const int STATE_EVALUATINGSTRAY = (1<<4);
  static const int STATE_PURGINGPINNED =  (1<<5);
  static const int STATE_BOTTOMLRU =    (1<<6);
  // stray dentry needs notification of releasing reference
  static const int STATE_STRAY =	STATE_NOTIFYREF;
  static const int MASK_STATE_IMPORT_KEPT = STATE_BOTTOMLRU;

  // -- pins --
  static const int PIN_INODEPIN =     1;  // linked inode is pinned
  static const int PIN_FRAGMENTING = -2;  // containing dir is refragmenting
  static const int PIN_PURGING =      3;
  static const int PIN_SCRUBPARENT =  4;

  static const unsigned EXPORT_NONCE = 1;


  CDentry(std::string_view n, __u32 h,
	  snapid_t f, snapid_t l) :
    hash(h),
    first(f), last(l),
    item_dirty(this),
    lock(this, &lock_type),
    versionlock(this, &versionlock_type),
    name(n)
  {}
  CDentry(std::string_view n, __u32 h, inodeno_t ino, unsigned char dt,
	  snapid_t f, snapid_t l) :
    hash(h),
    first(f), last(l),
    item_dirty(this),
    lock(this, &lock_type),
    versionlock(this, &versionlock_type),
    name(n)
  {
    linkage.remote_ino = ino;
    linkage.remote_d_type = dt;
  }

  ~CDentry() override {
    ceph_assert(batch_ops.empty());
  }

  std::string_view pin_name(int p) const override {
    switch (p) {
    case PIN_INODEPIN: return "inodepin";
    case PIN_FRAGMENTING: return "fragmenting";
    case PIN_PURGING: return "purging";
    case PIN_SCRUBPARENT: return "scrubparent";
    default: return generic_pin_name(p);
    }
  }

  // -- wait --
  //static const int WAIT_LOCK_OFFSET = 8;

  void add_waiter(uint64_t tag, MDSContext *c) override;

  bool is_lt(const MDSCacheObject *r) const override {
    return *this < *static_cast<const CDentry*>(r);
  }

  dentry_key_t key() {
    return dentry_key_t(last, name.c_str(), hash);
  }

  const CDir *get_dir() const { return dir; }
  CDir *get_dir() { return dir; }
  std::string_view get_name() const { return std::string_view(name); }

  __u32 get_hash() const { return hash; }

  // linkage
  const linkage_t *get_linkage() const { return &linkage; }
  linkage_t *get_linkage() { return &linkage; }

  linkage_t *_project_linkage() {
    projected.push_back(linkage_t());
    return &projected.back();
  }
  void push_projected_linkage();
  void push_projected_linkage(inodeno_t ino, char d_type) {
    linkage_t *p = _project_linkage();
    p->remote_ino = ino;
    p->remote_d_type = d_type;
  }
  void push_projected_linkage(CInode *inode); 
  linkage_t *pop_projected_linkage();

  bool is_projected() const { return !projected.empty(); }

  linkage_t *get_projected_linkage() {
    if (!projected.empty())
      return &projected.back();
    return &linkage;
  }

  const linkage_t *get_projected_linkage() const {
    if (!projected.empty())
      return &projected.back();
    return &linkage;
  }

  CInode *get_projected_inode() {
    return get_projected_linkage()->inode;
  }

  bool use_projected(client_t client, const MutationRef& mut) const {
    return lock.can_read_projected(client) || 
      lock.get_xlock_by() == mut;
  }
  linkage_t *get_linkage(client_t client, const MutationRef& mut) {
    return use_projected(client, mut) ? get_projected_linkage() : get_linkage();
  }

  // ref counts: pin ourselves in the LRU when we're pinned.
  void first_get() override {
    lru_pin();
  }
  void last_put() override {
    lru_unpin();
  }
  void _put() override;

  // auth pins
  bool can_auth_pin(int *err_ret=nullptr) const override;
  void auth_pin(void *by) override;
  void auth_unpin(void *by) override;
  void adjust_nested_auth_pins(int diradj, void *by);
  bool is_frozen() const override;
  bool is_freezing() const override;
  int get_num_dir_auth_pins() const;
  
  // remote links
  void link_remote(linkage_t *dnl, CInode *in);
  void unlink_remote(linkage_t *dnl);
  
  // copy cons
  CDentry(const CDentry& m);
  const CDentry& operator= (const CDentry& right);

  // misc
  void make_path_string(std::string& s, bool projected=false) const;
  void make_path(filepath& fp, bool projected=false) const;

  // -- version --
  version_t get_version() const { return version; }
  void set_version(version_t v) { projected_version = version = v; }
  version_t get_projected_version() const { return projected_version; }
  void set_projected_version(version_t v) { projected_version = v; }
  
  mds_authority_t authority() const override;

  version_t pre_dirty(version_t min=0);
  void _mark_dirty(LogSegment *ls);
  void mark_dirty(version_t projected_dirv, LogSegment *ls);
  void mark_clean();

  void mark_new();
  bool is_new() const { return state_test(STATE_NEW); }
  void clear_new() { state_clear(STATE_NEW); }
  
  // -- exporting
  // note: this assumes the dentry already exists.  
  // i.e., the name is already extracted... so we just need the other state.
  void encode_export(bufferlist& bl) {
    ENCODE_START(1, 1, bl);
    encode(first, bl);
    encode(state, bl);
    encode(version, bl);
    encode(projected_version, bl);
    encode(lock, bl);
    encode(get_replicas(), bl);
    get(PIN_TEMPEXPORTING);
    ENCODE_FINISH(bl);
  }
  void finish_export() {
    // twiddle
    clear_replica_map();
    replica_nonce = EXPORT_NONCE;
    state_clear(CDentry::STATE_AUTH);
    if (is_dirty())
      mark_clean();
    put(PIN_TEMPEXPORTING);
  }
  void abort_export() {
    put(PIN_TEMPEXPORTING);
  }
  void decode_import(bufferlist::const_iterator& blp, LogSegment *ls) {
    DECODE_START(1, blp);
    decode(first, blp);
    __u32 nstate;
    decode(nstate, blp);
    decode(version, blp);
    decode(projected_version, blp);
    decode(lock, blp);
    decode(get_replicas(), blp);

    // twiddle
    state &= MASK_STATE_IMPORT_KEPT;
    state_set(CDentry::STATE_AUTH);
    if (nstate & STATE_DIRTY)
      _mark_dirty(ls);
    if (is_replicated())
      get(PIN_REPLICATED);
    replica_nonce = 0;
    DECODE_FINISH(blp);
  }

  // -- locking --
  SimpleLock* get_lock(int type) override {
    ceph_assert(type == CEPH_LOCK_DN);
    return &lock;
  }
  void set_object_info(MDSCacheObjectInfo &info) override;
  void encode_lock_state(int type, bufferlist& bl) override;
  void decode_lock_state(int type, const bufferlist& bl) override;

  // ---------------------------------------------
  // replicas (on clients)

  bool is_any_leases() const {
    return !client_lease_map.empty();
  }
  const ClientLease *get_client_lease(client_t c) const {
    if (client_lease_map.count(c))
      return client_lease_map.find(c)->second;
    return 0;
  }
  ClientLease *get_client_lease(client_t c) {
    if (client_lease_map.count(c))
      return client_lease_map.find(c)->second;
    return 0;
  }
  bool have_client_lease(client_t c) const {
    const ClientLease *l = get_client_lease(c);
    if (l) 
      return true;
    else
      return false;
  }

  ClientLease *add_client_lease(client_t c, Session *session);
  void remove_client_lease(ClientLease *r, Locker *locker);  // returns remaining mask (if any), and kicks locker eval_gathers
  void remove_client_leases(Locker *locker);

  ostream& print_db_line_prefix(ostream& out) override;
  void print(ostream& out) override;
  void dump(Formatter *f) const;


  __u32 hash;
  snapid_t first, last;

  elist<CDentry*>::item item_dirty, item_dir_dirty;
  elist<CDentry*>::item item_stray;

  // lock
  static LockType lock_type;
  static LockType versionlock_type;

  SimpleLock lock; // FIXME referenced containers not in mempool
  LocalLock versionlock; // FIXME referenced containers not in mempool

  mempool::mds_co::map<client_t,ClientLease*> client_lease_map;
  std::map<int, std::unique_ptr<BatchOp>> batch_ops;


protected:
  friend class Migrator;
  friend class Locker;
  friend class MDCache;
  friend class StrayManager;
  friend class CInode;
  friend class C_MDC_XlockRequest;

  CDir *dir = nullptr;     // containing dirfrag
  linkage_t linkage;
  mempool::mds_co::list<linkage_t> projected;

  version_t version = 0;  // dir version when last touched.
  version_t projected_version = 0;  // what it will be when i unlock/commit.

private:
  mempool::mds_co::string name;
};

ostream& operator<<(ostream& out, const CDentry& dn);


#endif
Commit	Line	Data
7c673cae FG	1	// -- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t --
	2	// vim: ts=8 sw=2 smarttab
	3	/*
	4	* Ceph - scalable distributed file system
	5	*
	6	* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
	7	*
	8	* This is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License version 2.1, as published by the Free Software
	11	* Foundation. See file COPYING.
	12	*
	13	*/
	14
	15
	16
	17	#ifndef CEPH_CDENTRY_H
	18	#define CEPH_CDENTRY_H
	19
	20	#include <string>
11fdf7f2	21	#include <string_view>
7c673cae FG	22	#include <set>
	23
	24	#include "include/counter.h"
	25	#include "include/types.h"
	26	#include "include/buffer_fwd.h"
	27	#include "include/lru.h"
	28	#include "include/elist.h"
	29	#include "include/filepath.h"
	30
9f95a23c	31	#include "BatchOp.h"
7c673cae	32	#include "MDSCacheObject.h"
11fdf7f2	33	#include "MDSContext.h"
7c673cae FG	34	#include "SimpleLock.h"
	35	#include "LocalLock.h"
	36	#include "ScrubHeader.h"
	37
	38	class CInode;
	39	class CDir;
	40	class Locker;
7c673cae FG	41	class CDentry;
	42	class LogSegment;
	43
	44	class Session;
	45
7c673cae FG	46	// define an ordering
	47	bool operator<(const CDentry& l, const CDentry& r);
	48
	49	// dentry
	50	class CDentry : public MDSCacheObject, public LRUObject, public Counter<CDentry> {
	51	public:
181888fb	52	MEMPOOL_CLASS_HELPERS();
7c673cae FG	53	friend class CDir;
	54
	55	struct linkage_t {
94b18763 FG	56	CInode *inode = nullptr;
	57	inodeno_t remote_ino = 0;
	58	unsigned char remote_d_type = 0;
7c673cae	59
94b18763	60	linkage_t() {}
7c673cae FG	61
	62	// dentry type is primary \|\| remote \|\| null
	63	// inode ptr is required for primary, optional for remote, undefined for null
	64	bool is_primary() const { return remote_ino == 0 && inode != 0; }
	65	bool is_remote() const { return remote_ino > 0; }
	66	bool is_null() const { return remote_ino == 0 && inode == 0; }
	67
	68	CInode *get_inode() { return inode; }
	69	const CInode *get_inode() const { return inode; }
	70	inodeno_t get_remote_ino() const { return remote_ino; }
	71	unsigned char get_remote_d_type() const { return remote_d_type; }
	72	std::string get_remote_d_type_string() const;
	73
	74	void set_remote(inodeno_t ino, unsigned char d_type) {
	75	remote_ino = ino;
	76	remote_d_type = d_type;
	77	inode = 0;
	78	}
	79	void link_remote(CInode *in);
	80	};
	81
	82
	83	// -- state --
	84	static const int STATE_NEW = (1<<0);
	85	static const int STATE_FRAGMENTING = (1<<1);
	86	static const int STATE_PURGING = (1<<2);
	87	static const int STATE_BADREMOTEINO = (1<<3);
	88	static const int STATE_EVALUATINGSTRAY = (1<<4);
	89	static const int STATE_PURGINGPINNED = (1<<5);
31f18b77	90	static const int STATE_BOTTOMLRU = (1<<6);
7c673cae FG	91	// stray dentry needs notification of releasing reference
7c673cae FG	92	static const int STATE_STRAY = STATE_NOTIFYREF;
31f18b77	93	static const int MASK_STATE_IMPORT_KEPT = STATE_BOTTOMLRU;
7c673cae FG	94
	95	// -- pins --
	96	static const int PIN_INODEPIN = 1; // linked inode is pinned
	97	static const int PIN_FRAGMENTING = -2; // containing dir is refragmenting
	98	static const int PIN_PURGING = 3;
	99	static const int PIN_SCRUBPARENT = 4;
	100
	101	static const unsigned EXPORT_NONCE = 1;
	102
	103
11fdf7f2	104	CDentry(std::string_view n, __u32 h,
7c673cae	105	snapid_t f, snapid_t l) :
94b18763	106	hash(h),
7c673cae FG	107	first(f), last(l),
	108	item_dirty(this),
	109	lock(this, &lock_type),
	110	versionlock(this, &versionlock_type),
94b18763 FG	111	name(n)
94b18763 FG	112	{}
11fdf7f2	113	CDentry(std::string_view n, __u32 h, inodeno_t ino, unsigned char dt,
7c673cae	114	snapid_t f, snapid_t l) :
94b18763	115	hash(h),
7c673cae FG	116	first(f), last(l),
	117	item_dirty(this),
	118	lock(this, &lock_type),
	119	versionlock(this, &versionlock_type),
94b18763 FG	120	name(n)
94b18763 FG	121	{
7c673cae FG	122	linkage.remote_ino = ino;
	123	linkage.remote_d_type = dt;
	124	}
	125
9f95a23c TL	126	~CDentry() override {
	127	ceph_assert(batch_ops.empty());
	128	}
	129
11fdf7f2	130	std::string_view pin_name(int p) const override {
7c673cae FG	131	switch (p) {
	132	case PIN_INODEPIN: return "inodepin";
	133	case PIN_FRAGMENTING: return "fragmenting";
	134	case PIN_PURGING: return "purging";
	135	case PIN_SCRUBPARENT: return "scrubparent";
	136	default: return generic_pin_name(p);
	137	}
	138	}
	139
	140	// -- wait --
	141	//static const int WAIT_LOCK_OFFSET = 8;
	142
11fdf7f2	143	void add_waiter(uint64_t tag, MDSContext *c) override;
7c673cae FG	144
	145	bool is_lt(const MDSCacheObject *r) const override {
	146	return this < static_cast<const CDentry*>(r);
	147	}
	148
	149	dentry_key_t key() {
	150	return dentry_key_t(last, name.c_str(), hash);
	151	}
	152
	153	const CDir *get_dir() const { return dir; }
	154	CDir *get_dir() { return dir; }
11fdf7f2	155	std::string_view get_name() const { return std::string_view(name); }
7c673cae FG	156
	157	__u32 get_hash() const { return hash; }
	158
	159	// linkage
	160	const linkage_t *get_linkage() const { return &linkage; }
	161	linkage_t *get_linkage() { return &linkage; }
	162
	163	linkage_t *_project_linkage() {
	164	projected.push_back(linkage_t());
	165	return &projected.back();
	166	}
	167	void push_projected_linkage();
	168	void push_projected_linkage(inodeno_t ino, char d_type) {
	169	linkage_t *p = _project_linkage();
	170	p->remote_ino = ino;
	171	p->remote_d_type = d_type;
	172	}
	173	void push_projected_linkage(CInode *inode);
	174	linkage_t *pop_projected_linkage();
	175
	176	bool is_projected() const { return !projected.empty(); }
	177
	178	linkage_t *get_projected_linkage() {
	179	if (!projected.empty())
	180	return &projected.back();
	181	return &linkage;
	182	}
	183
	184	const linkage_t *get_projected_linkage() const {
	185	if (!projected.empty())
	186	return &projected.back();
	187	return &linkage;
	188	}
	189
	190	CInode *get_projected_inode() {
	191	return get_projected_linkage()->inode;
	192	}
	193
	194	bool use_projected(client_t client, const MutationRef& mut) const {
	195	return lock.can_read_projected(client) \|\|
	196	lock.get_xlock_by() == mut;
	197	}
	198	linkage_t *get_linkage(client_t client, const MutationRef& mut) {
	199	return use_projected(client, mut) ? get_projected_linkage() : get_linkage();
	200	}
	201
	202	// ref counts: pin ourselves in the LRU when we're pinned.
	203	void first_get() override {
	204	lru_pin();
	205	}
	206	void last_put() override {
	207	lru_unpin();
	208	}
	209	void _put() override;
	210
	211	// auth pins
91327a77	212	bool can_auth_pin(int *err_ret=nullptr) const override;
7c673cae FG	213	void auth_pin(void *by) override;
7c673cae FG	214	void auth_unpin(void *by) override;
11fdf7f2	215	void adjust_nested_auth_pins(int diradj, void *by);
7c673cae FG	216	bool is_frozen() const override;
	217	bool is_freezing() const override;
	218	int get_num_dir_auth_pins() const;
	219
	220	// remote links
	221	void link_remote(linkage_t dnl, CInode in);
	222	void unlink_remote(linkage_t *dnl);
	223
	224	// copy cons
	225	CDentry(const CDentry& m);
	226	const CDentry& operator= (const CDentry& right);
	227
	228	// misc
	229	void make_path_string(std::string& s, bool projected=false) const;
	230	void make_path(filepath& fp, bool projected=false) const;
	231
	232	// -- version --
	233	version_t get_version() const { return version; }
	234	void set_version(version_t v) { projected_version = version = v; }
	235	version_t get_projected_version() const { return projected_version; }
	236	void set_projected_version(version_t v) { projected_version = v; }
	237
	238	mds_authority_t authority() const override;
	239
	240	version_t pre_dirty(version_t min=0);
	241	void _mark_dirty(LogSegment *ls);
	242	void mark_dirty(version_t projected_dirv, LogSegment *ls);
	243	void mark_clean();
	244
	245	void mark_new();
	246	bool is_new() const { return state_test(STATE_NEW); }
	247	void clear_new() { state_clear(STATE_NEW); }
	248
7c673cae FG	249	// -- exporting
	250	// note: this assumes the dentry already exists.
	251	// i.e., the name is already extracted... so we just need the other state.
	252	void encode_export(bufferlist& bl) {
9f95a23c	253	ENCODE_START(1, 1, bl);
11fdf7f2 TL	254	encode(first, bl);
	255	encode(state, bl);
	256	encode(version, bl);
	257	encode(projected_version, bl);
	258	encode(lock, bl);
	259	encode(get_replicas(), bl);
7c673cae	260	get(PIN_TEMPEXPORTING);
9f95a23c	261	ENCODE_FINISH(bl);
7c673cae FG	262	}
	263	void finish_export() {
	264	// twiddle
	265	clear_replica_map();
	266	replica_nonce = EXPORT_NONCE;
	267	state_clear(CDentry::STATE_AUTH);
	268	if (is_dirty())
	269	mark_clean();
	270	put(PIN_TEMPEXPORTING);
	271	}
	272	void abort_export() {
	273	put(PIN_TEMPEXPORTING);
	274	}
11fdf7f2	275	void decode_import(bufferlist::const_iterator& blp, LogSegment *ls) {
9f95a23c	276	DECODE_START(1, blp);
11fdf7f2	277	decode(first, blp);
7c673cae	278	__u32 nstate;
11fdf7f2 TL	279	decode(nstate, blp);
	280	decode(version, blp);
	281	decode(projected_version, blp);
	282	decode(lock, blp);
	283	decode(get_replicas(), blp);
7c673cae FG	284
7c673cae FG	285	// twiddle
31f18b77	286	state &= MASK_STATE_IMPORT_KEPT;
7c673cae FG	287	state_set(CDentry::STATE_AUTH);
	288	if (nstate & STATE_DIRTY)
	289	_mark_dirty(ls);
181888fb	290	if (is_replicated())
7c673cae FG	291	get(PIN_REPLICATED);
7c673cae FG	292	replica_nonce = 0;
9f95a23c	293	DECODE_FINISH(blp);
7c673cae FG	294	}
	295
	296	// -- locking --
	297	SimpleLock* get_lock(int type) override {
11fdf7f2	298	ceph_assert(type == CEPH_LOCK_DN);
7c673cae FG	299	return &lock;
	300	}
	301	void set_object_info(MDSCacheObjectInfo &info) override;
	302	void encode_lock_state(int type, bufferlist& bl) override;
11fdf7f2	303	void decode_lock_state(int type, const bufferlist& bl) override;
7c673cae FG	304
	305	// ---------------------------------------------
	306	// replicas (on clients)
	307
	308	bool is_any_leases() const {
	309	return !client_lease_map.empty();
	310	}
	311	const ClientLease *get_client_lease(client_t c) const {
	312	if (client_lease_map.count(c))
	313	return client_lease_map.find(c)->second;
	314	return 0;
	315	}
	316	ClientLease *get_client_lease(client_t c) {
	317	if (client_lease_map.count(c))
	318	return client_lease_map.find(c)->second;
	319	return 0;
	320	}
	321	bool have_client_lease(client_t c) const {
	322	const ClientLease *l = get_client_lease(c);
	323	if (l)
	324	return true;
	325	else
	326	return false;
	327	}
	328
	329	ClientLease add_client_lease(client_t c, Session session);
	330	void remove_client_lease(ClientLease r, Locker locker); // returns remaining mask (if any), and kicks locker eval_gathers
	331	void remove_client_leases(Locker *locker);
	332
	333	ostream& print_db_line_prefix(ostream& out) override;
	334	void print(ostream& out) override;
	335	void dump(Formatter *f) const;
	336
	337
7c673cae FG	338	__u32 hash;
	339	snapid_t first, last;
	340
b32b8144	341	elist<CDentry*>::item item_dirty, item_dir_dirty;
7c673cae FG	342	elist<CDentry*>::item item_stray;
	343
	344	// lock
	345	static LockType lock_type;
	346	static LockType versionlock_type;
	347
94b18763 FG	348	SimpleLock lock; // FIXME referenced containers not in mempool
94b18763 FG	349	LocalLock versionlock; // FIXME referenced containers not in mempool
7c673cae	350
94b18763	351	mempool::mds_co::map<client_t,ClientLease*> client_lease_map;
9f95a23c	352	std::map<int, std::unique_ptr<BatchOp>> batch_ops;
7c673cae FG	353
	354
	355	protected:
	356	friend class Migrator;
	357	friend class Locker;
	358	friend class MDCache;
	359	friend class StrayManager;
	360	friend class CInode;
	361	friend class C_MDC_XlockRequest;
	362
94b18763	363	CDir *dir = nullptr; // containing dirfrag
7c673cae	364	linkage_t linkage;
94b18763 FG	365	mempool::mds_co::list<linkage_t> projected;
	366
	367	version_t version = 0; // dir version when last touched.
	368	version_t projected_version = 0; // what it will be when i unlock/commit.
7c673cae	369
94b18763 FG	370	private:
94b18763 FG	371	mempool::mds_co::string name;
7c673cae FG	372	};
	373
	374	ostream& operator<<(ostream& out, const CDentry& dn);
	375
	376
	377	#endif