--- /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_CDIR_H
+#define CEPH_CDIR_H
+
+#include "include/counter.h"
+#include "include/types.h"
+#include "include/buffer_fwd.h"
+#include "common/bloom_filter.hpp"
+#include "common/config.h"
+#include "common/DecayCounter.h"
+
+#include "MDSCacheObject.h"
+
+#include <iosfwd>
+
+#include <list>
+#include <set>
+#include <map>
+#include <string>
+
+
+#include "CInode.h"
+
+class CDentry;
+class MDCache;
+
+struct ObjectOperation;
+
+ostream& operator<<(ostream& out, const class CDir& dir);
+class CDir : public MDSCacheObject, public Counter<CDir> {
+ friend ostream& operator<<(ostream& out, const class CDir& dir);
+
+public:
+ MEMPOOL_CLASS_HELPERS();
+ // -- pins --
+ static const int PIN_DNWAITER = 1;
+ static const int PIN_INOWAITER = 2;
+ static const int PIN_CHILD = 3;
+ static const int PIN_FROZEN = 4;
+ static const int PIN_SUBTREE = 5;
+ static const int PIN_IMPORTING = 7;
+ static const int PIN_IMPORTBOUND = 9;
+ static const int PIN_EXPORTBOUND = 10;
+ static const int PIN_STICKY = 11;
+ static const int PIN_SUBTREETEMP = 12; // used by MDCache::trim_non_auth()
+ const char *pin_name(int p) const override {
+ switch (p) {
+ case PIN_DNWAITER: return "dnwaiter";
+ case PIN_INOWAITER: return "inowaiter";
+ case PIN_CHILD: return "child";
+ case PIN_FROZEN: return "frozen";
+ case PIN_SUBTREE: return "subtree";
+ case PIN_IMPORTING: return "importing";
+ case PIN_IMPORTBOUND: return "importbound";
+ case PIN_EXPORTBOUND: return "exportbound";
+ case PIN_STICKY: return "sticky";
+ case PIN_SUBTREETEMP: return "subtreetemp";
+ default: return generic_pin_name(p);
+ }
+ }
+
+ // -- state --
+ static const unsigned STATE_COMPLETE = (1<< 1); // the complete contents are in cache
+ static const unsigned STATE_FROZENTREE = (1<< 2); // root of tree (bounded by exports)
+ static const unsigned STATE_FREEZINGTREE = (1<< 3); // in process of freezing
+ static const unsigned STATE_FROZENDIR = (1<< 4);
+ static const unsigned STATE_FREEZINGDIR = (1<< 5);
+ static const unsigned STATE_COMMITTING = (1<< 6); // mid-commit
+ static const unsigned STATE_FETCHING = (1<< 7); // currenting fetching
+ static const unsigned STATE_CREATING = (1<< 8);
+ static const unsigned STATE_IMPORTBOUND = (1<<10);
+ static const unsigned STATE_EXPORTBOUND = (1<<11);
+ static const unsigned STATE_EXPORTING = (1<<12);
+ static const unsigned STATE_IMPORTING = (1<<13);
+ static const unsigned STATE_FRAGMENTING = (1<<14);
+ static const unsigned STATE_STICKY = (1<<15); // sticky pin due to inode stickydirs
+ static const unsigned STATE_DNPINNEDFRAG = (1<<16); // dir is refragmenting
+ static const unsigned STATE_ASSIMRSTAT = (1<<17); // assimilating inode->frag rstats
+ static const unsigned STATE_DIRTYDFT = (1<<18); // dirty dirfragtree
+ static const unsigned STATE_BADFRAG = (1<<19); // bad dirfrag
+ static const unsigned STATE_AUXSUBTREE = (1<<20); // no subtree merge
+
+ // common states
+ static const unsigned STATE_CLEAN = 0;
+ static const unsigned STATE_INITIAL = 0;
+
+ // these state bits are preserved by an import/export
+ // ...except if the directory is hashed, in which case none of them are!
+ static const unsigned MASK_STATE_EXPORTED =
+ (STATE_COMPLETE|STATE_DIRTY|STATE_DIRTYDFT|STATE_BADFRAG);
+ static const unsigned MASK_STATE_IMPORT_KEPT =
+ (
+ STATE_IMPORTING
+ |STATE_IMPORTBOUND|STATE_EXPORTBOUND
+ |STATE_FROZENTREE
+ |STATE_STICKY);
+ static const unsigned MASK_STATE_EXPORT_KEPT =
+ (STATE_EXPORTING
+ |STATE_IMPORTBOUND|STATE_EXPORTBOUND
+ |STATE_FROZENTREE
+ |STATE_FROZENDIR
+ |STATE_STICKY);
+ static const unsigned MASK_STATE_FRAGMENT_KEPT =
+ (STATE_DIRTY|
+ STATE_EXPORTBOUND |
+ STATE_IMPORTBOUND |
+ STATE_AUXSUBTREE |
+ STATE_REJOINUNDEF);
+
+ // -- rep spec --
+ static const int REP_NONE = 0;
+ static const int REP_ALL = 1;
+ static const int REP_LIST = 2;
+
+
+ static const unsigned EXPORT_NONCE = 1;
+
+
+ // -- wait masks --
+ static const uint64_t WAIT_DENTRY = (1<<0); // wait for item to be in cache
+ static const uint64_t WAIT_COMPLETE = (1<<1); // wait for complete dir contents
+ static const uint64_t WAIT_FROZEN = (1<<2); // auth pins removed
+ static const uint64_t WAIT_CREATED = (1<<3); // new dirfrag is logged
+
+ static const int WAIT_DNLOCK_OFFSET = 4;
+
+ static const uint64_t WAIT_ANY_MASK = (uint64_t)(-1);
+ static const uint64_t WAIT_ATFREEZEROOT = (WAIT_UNFREEZE);
+ static const uint64_t WAIT_ATSUBTREEROOT = (WAIT_SINGLEAUTH);
+
+
+
+
+ public:
+ // context
+ MDCache *cache;
+
+ CInode *inode; // my inode
+ frag_t frag; // my frag
+
+ bool is_lt(const MDSCacheObject *r) const override {
+ return dirfrag() < (static_cast<const CDir*>(r))->dirfrag();
+ }
+
+ fnode_t fnode;
+ snapid_t first;
+ compact_map<snapid_t,old_rstat_t> dirty_old_rstat; // [value.first,key]
+
+ // my inodes with dirty rstat data
+ elist<CInode*> dirty_rstat_inodes;
+
+ void resync_accounted_fragstat();
+ void resync_accounted_rstat();
+ void assimilate_dirty_rstat_inodes();
+ void assimilate_dirty_rstat_inodes_finish(MutationRef& mut, EMetaBlob *blob);
+
+protected:
+ version_t projected_version;
+ std::list<fnode_t*> projected_fnode;
+
+public:
+ elist<CDir*>::item item_dirty, item_new;
+
+
+public:
+ version_t get_version() const { return fnode.version; }
+ void set_version(version_t v) {
+ assert(projected_fnode.empty());
+ projected_version = fnode.version = v;
+ }
+ version_t get_projected_version() const { return projected_version; }
+
+ const fnode_t *get_projected_fnode() const {
+ if (projected_fnode.empty())
+ return &fnode;
+ else
+ return projected_fnode.back();
+ }
+
+ fnode_t *get_projected_fnode() {
+ if (projected_fnode.empty())
+ return &fnode;
+ else
+ return projected_fnode.back();
+ }
+ fnode_t *project_fnode();
+
+ void pop_and_dirty_projected_fnode(LogSegment *ls);
+ bool is_projected() const { return !projected_fnode.empty(); }
+ version_t pre_dirty(version_t min=0);
+ void _mark_dirty(LogSegment *ls);
+ void _set_dirty_flag() {
+ if (!state_test(STATE_DIRTY)) {
+ state_set(STATE_DIRTY);
+ get(PIN_DIRTY);
+ }
+ }
+ void mark_dirty(version_t pv, LogSegment *ls);
+ void mark_clean();
+
+ bool is_new() { return item_new.is_on_list(); }
+ void mark_new(LogSegment *ls);
+
+ bool is_bad() { return state_test(STATE_BADFRAG); }
+private:
+ void log_mark_dirty();
+
+public:
+ typedef std::map<dentry_key_t, CDentry*> map_t;
+
+ class scrub_info_t {
+ public:
+ /// inodes we contain with dirty scrub stamps
+ map<dentry_key_t,CInode*> dirty_scrub_stamps; // TODO: make use of this!
+ struct scrub_stamps {
+ version_t version;
+ utime_t time;
+ scrub_stamps() : version(0) {}
+ void operator=(const scrub_stamps &o) {
+ version = o.version;
+ time = o.time;
+ }
+ };
+
+ scrub_stamps recursive_start; // when we last started a recursive scrub
+ scrub_stamps last_recursive; // when we last finished a recursive scrub
+ scrub_stamps last_local; // when we last did a local scrub
+
+ bool directory_scrubbing; /// safety check
+ bool need_scrub_local;
+ bool last_scrub_dirty; /// is scrub info dirty or is it flushed to fnode?
+ bool pending_scrub_error;
+
+ /// these are lists of children in each stage of scrubbing
+ set<dentry_key_t> directories_to_scrub;
+ set<dentry_key_t> directories_scrubbing;
+ set<dentry_key_t> directories_scrubbed;
+ set<dentry_key_t> others_to_scrub;
+ set<dentry_key_t> others_scrubbing;
+ set<dentry_key_t> others_scrubbed;
+
+ ScrubHeaderRefConst header;
+
+ scrub_info_t() :
+ directory_scrubbing(false),
+ need_scrub_local(false),
+ last_scrub_dirty(false),
+ pending_scrub_error(false) {}
+ };
+ /**
+ * Call to start this CDir on a new scrub.
+ * @pre It is not currently scrubbing
+ * @pre The CDir is marked complete.
+ * @post It has set up its internal scrubbing state.
+ */
+ void scrub_initialize(const ScrubHeaderRefConst& header);
+ /**
+ * Get the next dentry to scrub. Gives you a CDentry* and its meaning. This
+ * function will give you all directory-representing dentries before any
+ * others.
+ * 0: success, you should scrub this CDentry right now
+ * EAGAIN: is currently fetching the next CDentry into memory for you.
+ * It will activate your callback when done; try again when it does!
+ * ENOENT: there are no remaining dentries to scrub
+ * <0: There was an unexpected error
+ *
+ * @param cb An MDSInternalContext which will be activated only if
+ * we return EAGAIN via rcode, or else ignored
+ * @param dnout CDentry * which you should next scrub, or NULL
+ * @returns a value as described above
+ */
+ int scrub_dentry_next(MDSInternalContext *cb, CDentry **dnout);
+ /**
+ * Get the currently scrubbing dentries. When returned, the passed-in
+ * list will be filled with all CDentry * which have been returned
+ * from scrub_dentry_next() but not sent back via scrub_dentry_finished().
+ */
+ void scrub_dentries_scrubbing(list<CDentry*> *out_dentries);
+ /**
+ * Report to the CDir that a CDentry has been scrubbed. Call this
+ * for every CDentry returned from scrub_dentry_next().
+ * @param dn The CDentry which has been scrubbed.
+ */
+ void scrub_dentry_finished(CDentry *dn);
+ /**
+ * Call this once all CDentries have been scrubbed, according to
+ * scrub_dentry_next's listing. It finalizes the scrub statistics.
+ */
+ void scrub_finished();
+ /**
+ * Tell the CDir to do a local scrub of itself.
+ * @pre The CDir is_complete().
+ * @returns true if the rstats and directory contents match, false otherwise.
+ */
+ bool scrub_local();
+private:
+ /**
+ * Create a scrub_info_t struct for the scrub_infop pointer.
+ */
+ void scrub_info_create() const;
+ /**
+ * Delete the scrub_infop if it's not got any useful data.
+ */
+ void scrub_maybe_delete_info();
+ /**
+ * Check the given set (presumably one of those in scrub_info_t) for the
+ * next key to scrub and look it up (or fail!).
+ */
+ int _next_dentry_on_set(set<dentry_key_t>& dns, bool missing_okay,
+ MDSInternalContext *cb, CDentry **dnout);
+
+
+protected:
+ std::unique_ptr<scrub_info_t> scrub_infop;
+
+ // contents of this directory
+ map_t items; // non-null AND null
+ unsigned num_head_items;
+ unsigned num_head_null;
+ unsigned num_snap_items;
+ unsigned num_snap_null;
+
+ int num_dirty;
+
+ // state
+ version_t committing_version;
+ version_t committed_version;
+
+ compact_set<string> stale_items;
+
+ // lock nesting, freeze
+ static int num_frozen_trees;
+ static int num_freezing_trees;
+
+ int dir_auth_pins;
+ int request_pins;
+
+ // cache control (defined for authority; hints for replicas)
+ __s32 dir_rep;
+ compact_set<__s32> dir_rep_by; // if dir_rep == REP_LIST
+
+ // popularity
+ dirfrag_load_vec_t pop_me;
+ dirfrag_load_vec_t pop_nested;
+ dirfrag_load_vec_t pop_auth_subtree;
+ dirfrag_load_vec_t pop_auth_subtree_nested;
+
+ utime_t last_popularity_sample;
+
+ load_spread_t pop_spread;
+
+ // and to provide density
+ int num_dentries_nested;
+ int num_dentries_auth_subtree;
+ int num_dentries_auth_subtree_nested;
+
+
+ // friends
+ friend class Migrator;
+ friend class CInode;
+ friend class MDCache;
+ friend class MDiscover;
+ friend class MDBalancer;
+
+ friend class CDirDiscover;
+ friend class CDirExport;
+ friend class C_IO_Dir_TMAP_Fetched;
+ friend class C_IO_Dir_OMAP_Fetched;
+ friend class C_IO_Dir_OMAP_FetchedMore;
+ friend class C_IO_Dir_Committed;
+
+ std::unique_ptr<bloom_filter> bloom;
+ /* If you set up the bloom filter, you must keep it accurate!
+ * It's deleted when you mark_complete() and is deliberately not serialized.*/
+
+ public:
+ CDir(CInode *in, frag_t fg, MDCache *mdcache, bool auth);
+
+ const scrub_info_t *scrub_info() const {
+ if (!scrub_infop) {
+ scrub_info_create();
+ }
+ return scrub_infop.get();
+ }
+
+
+ // -- accessors --
+ inodeno_t ino() const { return inode->ino(); } // deprecate me?
+ frag_t get_frag() const { return frag; }
+ dirfrag_t dirfrag() const { return dirfrag_t(inode->ino(), frag); }
+
+ CInode *get_inode() { return inode; }
+ const CInode *get_inode() const { return inode; }
+ CDir *get_parent_dir() { return inode->get_parent_dir(); }
+
+ map_t::iterator begin() { return items.begin(); }
+ map_t::iterator end() { return items.end(); }
+ map_t::iterator lower_bound(dentry_key_t key) { return items.lower_bound(key); }
+
+ unsigned get_num_head_items() const { return num_head_items; }
+ unsigned get_num_head_null() const { return num_head_null; }
+ unsigned get_num_snap_items() const { return num_snap_items; }
+ unsigned get_num_snap_null() const { return num_snap_null; }
+ unsigned get_num_any() const { return num_head_items + num_head_null + num_snap_items + num_snap_null; }
+
+ bool check_rstats(bool scrub=false);
+
+ void inc_num_dirty() { num_dirty++; }
+ void dec_num_dirty() {
+ assert(num_dirty > 0);
+ num_dirty--;
+ }
+ int get_num_dirty() const {
+ return num_dirty;
+ }
+
+ int64_t get_frag_size() const {
+ return get_projected_fnode()->fragstat.size();
+ }
+
+ // -- dentries and inodes --
+ public:
+ CDentry* lookup_exact_snap(const std::string& dname, snapid_t last);
+ CDentry* lookup(const std::string& n, snapid_t snap=CEPH_NOSNAP);
+ CDentry* lookup(const char *n, snapid_t snap=CEPH_NOSNAP) {
+ return lookup(std::string(n), snap);
+ }
+
+ CDentry* add_null_dentry(const std::string& dname,
+ snapid_t first=2, snapid_t last=CEPH_NOSNAP);
+ CDentry* add_primary_dentry(const std::string& dname, CInode *in,
+ snapid_t first=2, snapid_t last=CEPH_NOSNAP);
+ CDentry* add_remote_dentry(const std::string& dname, inodeno_t ino, unsigned char d_type,
+ snapid_t first=2, snapid_t last=CEPH_NOSNAP);
+ void remove_dentry( CDentry *dn ); // delete dentry
+ void link_remote_inode( CDentry *dn, inodeno_t ino, unsigned char d_type);
+ void link_remote_inode( CDentry *dn, CInode *in );
+ void link_primary_inode( CDentry *dn, CInode *in );
+ void unlink_inode(CDentry *dn, bool adjust_lru=true);
+ void try_remove_unlinked_dn(CDentry *dn);
+
+ void add_to_bloom(CDentry *dn);
+ bool is_in_bloom(const std::string& name);
+ bool has_bloom() { return (bloom ? true : false); }
+ void remove_bloom() {
+ bloom.reset();
+ }
+private:
+ void link_inode_work( CDentry *dn, CInode *in );
+ void unlink_inode_work( CDentry *dn );
+ void remove_null_dentries();
+ void purge_stale_snap_data(const std::set<snapid_t>& snaps);
+public:
+ void try_remove_dentries_for_stray();
+ bool try_trim_snap_dentry(CDentry *dn, const std::set<snapid_t>& snaps);
+
+
+public:
+ void split(int bits, list<CDir*>& subs, list<MDSInternalContextBase*>& waiters, bool replay);
+ void merge(list<CDir*>& subs, list<MDSInternalContextBase*>& waiters, bool replay);
+
+ bool should_split() const {
+ return (int)get_frag_size() > g_conf->mds_bal_split_size;
+ }
+ bool should_split_fast() const;
+ bool should_merge() const {
+ return (int)get_frag_size() < g_conf->mds_bal_merge_size;
+ }
+
+private:
+ void prepare_new_fragment(bool replay);
+ void prepare_old_fragment(map<string_snap_t, std::list<MDSInternalContextBase*> >& dentry_waiters, bool replay);
+ void steal_dentry(CDentry *dn); // from another dir. used by merge/split.
+ void finish_old_fragment(list<MDSInternalContextBase*>& waiters, bool replay);
+ void init_fragment_pins();
+
+
+ // -- authority --
+ /*
+ * normal: <parent,unknown> !subtree_root
+ * delegation: <mds,unknown> subtree_root
+ * ambiguous: <mds1,mds2> subtree_root
+ * <parent,mds2> subtree_root
+ */
+ mds_authority_t dir_auth;
+
+ std::string get_path() const;
+
+ public:
+ mds_authority_t authority() const override;
+ mds_authority_t get_dir_auth() const { return dir_auth; }
+ void set_dir_auth(mds_authority_t a);
+ void set_dir_auth(mds_rank_t a) { set_dir_auth(mds_authority_t(a, CDIR_AUTH_UNKNOWN)); }
+ bool is_ambiguous_dir_auth() const {
+ return dir_auth.second != CDIR_AUTH_UNKNOWN;
+ }
+ bool is_full_dir_auth() const {
+ return is_auth() && !is_ambiguous_dir_auth();
+ }
+ bool is_full_dir_nonauth() const {
+ return !is_auth() && !is_ambiguous_dir_auth();
+ }
+
+ bool is_subtree_root() const {
+ return dir_auth != CDIR_AUTH_DEFAULT;
+ }
+
+ bool contains(CDir *x); // true if we are x or an ancestor of x
+
+
+ // for giving to clients
+ void get_dist_spec(std::set<mds_rank_t>& ls, mds_rank_t auth) {
+ if (is_rep()) {
+ list_replicas(ls);
+ if (!ls.empty())
+ ls.insert(auth);
+ }
+ }
+ void encode_dirstat(bufferlist& bl, mds_rank_t whoami) {
+ /*
+ * note: encoding matches struct ceph_client_reply_dirfrag
+ */
+ frag_t frag = get_frag();
+ mds_rank_t auth;
+ std::set<mds_rank_t> dist;
+
+ auth = dir_auth.first;
+ if (is_auth())
+ get_dist_spec(dist, whoami);
+
+ ::encode(frag, bl);
+ ::encode(auth, bl);
+ ::encode(dist, bl);
+ }
+
+ void _encode_base(bufferlist& bl) {
+ ::encode(first, bl);
+ ::encode(fnode, bl);
+ ::encode(dir_rep, bl);
+ ::encode(dir_rep_by, bl);
+ }
+ void _decode_base(bufferlist::iterator& p) {
+ ::decode(first, p);
+ ::decode(fnode, p);
+ ::decode(dir_rep, p);
+ ::decode(dir_rep_by, p);
+ }
+ void encode_replica(mds_rank_t who, bufferlist& bl) {
+ __u32 nonce = add_replica(who);
+ ::encode(nonce, bl);
+ _encode_base(bl);
+ }
+ void decode_replica(bufferlist::iterator& p) {
+ __u32 nonce;
+ ::decode(nonce, p);
+ replica_nonce = nonce;
+ _decode_base(p);
+ }
+
+
+
+ // -- state --
+ bool is_complete() { return state & STATE_COMPLETE; }
+ bool is_exporting() { return state & STATE_EXPORTING; }
+ bool is_importing() { return state & STATE_IMPORTING; }
+ bool is_dirty_dft() { return state & STATE_DIRTYDFT; }
+
+ int get_dir_rep() const { return dir_rep; }
+ bool is_rep() const {
+ if (dir_rep == REP_NONE) return false;
+ return true;
+ }
+
+ // -- fetch --
+ object_t get_ondisk_object() {
+ return file_object_t(ino(), frag);
+ }
+ void fetch(MDSInternalContextBase *c, bool ignore_authpinnability=false);
+ void fetch(MDSInternalContextBase *c, const std::string& want_dn, bool ignore_authpinnability=false);
+ void fetch(MDSInternalContextBase *c, const std::set<dentry_key_t>& keys);
+protected:
+ compact_set<string> wanted_items;
+
+ void _omap_fetch(MDSInternalContextBase *fin, const std::set<dentry_key_t>& keys);
+ void _omap_fetch_more(
+ bufferlist& hdrbl, std::map<std::string, bufferlist>& omap,
+ MDSInternalContextBase *fin);
+ CDentry *_load_dentry(
+ const std::string &key,
+ const std::string &dname,
+ snapid_t last,
+ bufferlist &bl,
+ int pos,
+ const std::set<snapid_t> *snaps,
+ bool *force_dirty,
+ list<CInode*> *undef_inodes);
+
+ /**
+ * Mark this fragment as BADFRAG (common part of go_bad and go_bad_dentry)
+ */
+ void _go_bad();
+
+ /**
+ * Go bad due to a damaged dentry (register with damagetable and go BADFRAG)
+ */
+ void go_bad_dentry(snapid_t last, const std::string &dname);
+
+ /**
+ * Go bad due to a damaged header (register with damagetable and go BADFRAG)
+ */
+ void go_bad(bool complete);
+
+ void _omap_fetched(bufferlist& hdrbl, std::map<std::string, bufferlist>& omap,
+ bool complete, int r);
+
+ // -- commit --
+ compact_map<version_t, std::list<MDSInternalContextBase*> > waiting_for_commit;
+ void _commit(version_t want, int op_prio);
+ void _omap_commit(int op_prio);
+ void _encode_dentry(CDentry *dn, bufferlist& bl, const std::set<snapid_t> *snaps);
+ void _committed(int r, version_t v);
+public:
+#if 0 // unused?
+ void wait_for_commit(Context *c, version_t v=0);
+#endif
+ void commit_to(version_t want);
+ void commit(version_t want, MDSInternalContextBase *c,
+ bool ignore_authpinnability=false, int op_prio=-1);
+
+ // -- dirtyness --
+ version_t get_committing_version() const { return committing_version; }
+ version_t get_committed_version() const { return committed_version; }
+ void set_committed_version(version_t v) { committed_version = v; }
+
+ void mark_complete();
+
+
+ // -- reference counting --
+ void first_get() override;
+ void last_put() override;
+
+ void request_pin_get() {
+ if (request_pins == 0) get(PIN_REQUEST);
+ request_pins++;
+ }
+ void request_pin_put() {
+ request_pins--;
+ if (request_pins == 0) put(PIN_REQUEST);
+ }
+
+ // -- waiters --
+protected:
+ compact_map< string_snap_t, std::list<MDSInternalContextBase*> > waiting_on_dentry;
+
+public:
+ bool is_waiting_for_dentry(const std::string& dname, snapid_t snap) {
+ return waiting_on_dentry.count(string_snap_t(dname, snap));
+ }
+ void add_dentry_waiter(const std::string& dentry, snapid_t snap, MDSInternalContextBase *c);
+ void take_dentry_waiting(const std::string& dentry, snapid_t first, snapid_t last, std::list<MDSInternalContextBase*>& ls);
+ void take_sub_waiting(std::list<MDSInternalContextBase*>& ls); // dentry or ino
+
+ void add_waiter(uint64_t mask, MDSInternalContextBase *c) override;
+ void take_waiting(uint64_t mask, std::list<MDSInternalContextBase*>& ls) override; // may include dentry waiters
+ void finish_waiting(uint64_t mask, int result = 0); // ditto
+
+
+ // -- import/export --
+ void encode_export(bufferlist& bl);
+ void finish_export(utime_t now);
+ void abort_export() {
+ put(PIN_TEMPEXPORTING);
+ }
+ void decode_import(bufferlist::iterator& blp, utime_t now, LogSegment *ls);
+
+ // -- auth pins --
+ bool can_auth_pin() const override { return is_auth() && !(is_frozen() || is_freezing()); }
+ int get_cum_auth_pins() const { return auth_pins + nested_auth_pins; }
+ int get_auth_pins() const { return auth_pins; }
+ int get_nested_auth_pins() const { return nested_auth_pins; }
+ int get_dir_auth_pins() const { return dir_auth_pins; }
+ void auth_pin(void *who) override;
+ void auth_unpin(void *who) override;
+
+ void adjust_nested_auth_pins(int inc, int dirinc, void *by);
+ void verify_fragstat();
+
+ // -- freezing --
+ bool freeze_tree();
+ void _freeze_tree();
+ void unfreeze_tree();
+
+ bool freeze_dir();
+ void _freeze_dir();
+ void unfreeze_dir();
+
+ void maybe_finish_freeze();
+
+ bool is_freezing() const override { return is_freezing_tree() || is_freezing_dir(); }
+ bool is_freezing_tree() const;
+ bool is_freezing_tree_root() const { return state & STATE_FREEZINGTREE; }
+ bool is_freezing_dir() const { return state & STATE_FREEZINGDIR; }
+
+ bool is_frozen() const override { return is_frozen_dir() || is_frozen_tree(); }
+ bool is_frozen_tree() const;
+ bool is_frozen_tree_root() const { return state & STATE_FROZENTREE; }
+ bool is_frozen_dir() const { return state & STATE_FROZENDIR; }
+
+ bool is_freezeable(bool freezing=false) const {
+ // no nested auth pins.
+ if ((auth_pins-freezing) > 0 || nested_auth_pins > 0)
+ return false;
+
+ // inode must not be frozen.
+ if (!is_subtree_root() && inode->is_frozen())
+ return false;
+
+ return true;
+ }
+ bool is_freezeable_dir(bool freezing=false) const {
+ if ((auth_pins-freezing) > 0 || dir_auth_pins > 0)
+ return false;
+
+ // if not subtree root, inode must not be frozen (tree--frozen_dir is okay).
+ if (!is_subtree_root() && inode->is_frozen() && !inode->is_frozen_dir())
+ return false;
+
+ return true;
+ }
+
+ CDir *get_frozen_tree_root();
+
+
+ ostream& print_db_line_prefix(ostream& out) override;
+ void print(ostream& out) override;
+ void dump(Formatter *f) const;
+};
+
+#endif
Code Review / stor4nfv.git / blobdiff