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Diffstat (limited to 'src/mds/DamageTable.cc')
| -rw-r--r-- | src/mds/DamageTable.cc | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/src/mds/DamageTable.cc b/src/mds/DamageTable.cc new file mode 100644 index 000000000..22802079d --- /dev/null +++ b/src/mds/DamageTable.cc @@ -0,0 +1,275 @@ +// -*- 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. + * + */ + +#include "common/debug.h" + +#include "mds/CDir.h" + +#include "DamageTable.h" + +#define dout_context g_ceph_context +#define dout_subsys ceph_subsys_mds +#undef dout_prefix +#define dout_prefix *_dout << "mds." << rank << ".damage " << __func__ << " " + +namespace { +/** + * Record damage to a particular dirfrag, implicitly affecting + * any dentries within it. + */ +class DirFragDamage : public DamageEntry +{ + public: + inodeno_t ino; + frag_t frag; + + DirFragDamage(inodeno_t ino_, frag_t frag_) + : ino(ino_), frag(frag_) + {} + + damage_entry_type_t get_type() const override + { + return DAMAGE_ENTRY_DIRFRAG; + } + + void dump(Formatter *f) const override + { + f->open_object_section("dir_frag_damage"); + f->dump_string("damage_type", "dir_frag"); + f->dump_int("id", id); + f->dump_int("ino", ino); + f->dump_stream("frag") << frag; + f->dump_string("path", path); + f->close_section(); + } +}; + + +/** + * Record damage to a particular dname within a particular dirfrag + */ +class DentryDamage : public DamageEntry +{ + public: + inodeno_t ino; + frag_t frag; + std::string dname; + snapid_t snap_id; + + DentryDamage( + inodeno_t ino_, + frag_t frag_, + std::string_view dname_, + snapid_t snap_id_) + : ino(ino_), frag(frag_), dname(dname_), snap_id(snap_id_) + {} + + damage_entry_type_t get_type() const override + { + return DAMAGE_ENTRY_DENTRY; + } + + void dump(Formatter *f) const override + { + f->open_object_section("dentry_damage"); + f->dump_string("damage_type", "dentry"); + f->dump_int("id", id); + f->dump_int("ino", ino); + f->dump_stream("frag") << frag; + f->dump_string("dname", dname); + f->dump_stream("snap_id") << snap_id; + f->dump_string("path", path); + f->close_section(); + } +}; + + +/** + * Record damage to our ability to look up an ino by number + */ +class BacktraceDamage : public DamageEntry +{ + public: + inodeno_t ino; + + BacktraceDamage(inodeno_t ino_) + : ino(ino_) + {} + + damage_entry_type_t get_type() const override + { + return DAMAGE_ENTRY_BACKTRACE; + } + + void dump(Formatter *f) const override + { + f->open_object_section("backtrace_damage"); + f->dump_string("damage_type", "backtrace"); + f->dump_int("id", id); + f->dump_int("ino", ino); + f->dump_string("path", path); + f->close_section(); + } +}; +} + +DamageEntry::~DamageEntry() +{} + +bool DamageTable::notify_dentry( + inodeno_t ino, frag_t frag, + snapid_t snap_id, std::string_view dname, std::string_view path) +{ + if (oversized()) { + return true; + } + + // Special cases: damage to these dirfrags is considered fatal to + // the MDS rank that owns them. + if ( + (MDS_INO_IS_MDSDIR(ino) && MDS_INO_MDSDIR_OWNER(ino) == rank) + || + (MDS_INO_IS_STRAY(ino) && MDS_INO_STRAY_OWNER(ino) == rank) + ) { + derr << "Damage to dentries in fragment " << frag << " of ino " << ino + << "is fatal because it is a system directory for this rank" << dendl; + return true; + } + + auto& df_dentries = dentries[DirFragIdent(ino, frag)]; + if (auto [it, inserted] = df_dentries.try_emplace(DentryIdent(dname, snap_id)); inserted) { + auto entry = std::make_shared<DentryDamage>(ino, frag, dname, snap_id); + entry->path = path; + it->second = entry; + by_id[entry->id] = std::move(entry); + } + + return false; +} + +bool DamageTable::notify_dirfrag(inodeno_t ino, frag_t frag, + std::string_view path) +{ + // Special cases: damage to these dirfrags is considered fatal to + // the MDS rank that owns them. + if ((MDS_INO_IS_STRAY(ino) && MDS_INO_STRAY_OWNER(ino) == rank) + || (ino == CEPH_INO_ROOT)) { + derr << "Damage to fragment " << frag << " of ino " << ino + << " is fatal because it is a system directory for this rank" << dendl; + return true; + } + + if (oversized()) { + return true; + } + + if (auto [it, inserted] = dirfrags.try_emplace(DirFragIdent(ino, frag)); inserted) { + DamageEntryRef entry = std::make_shared<DirFragDamage>(ino, frag); + entry->path = path; + it->second = entry; + by_id[entry->id] = std::move(entry); + } + + return false; +} + +bool DamageTable::notify_remote_damaged(inodeno_t ino, std::string_view path) +{ + if (oversized()) { + return true; + } + + if (auto [it, inserted] = remotes.try_emplace(ino); inserted) { + auto entry = std::make_shared<BacktraceDamage>(ino); + entry->path = path; + it->second = entry; + by_id[entry->id] = std::move(entry); + } + + return false; +} + +bool DamageTable::oversized() const +{ + return by_id.size() > (size_t)(g_conf()->mds_damage_table_max_entries); +} + +bool DamageTable::is_dentry_damaged( + const CDir *dir_frag, + std::string_view dname, + const snapid_t snap_id) const +{ + if (dentries.count( + DirFragIdent(dir_frag->inode->ino(), dir_frag->frag) + ) == 0) { + return false; + } + + const std::map<DentryIdent, DamageEntryRef> &frag_dentries = + dentries.at(DirFragIdent(dir_frag->inode->ino(), dir_frag->frag)); + + return frag_dentries.count(DentryIdent(dname, snap_id)) > 0; +} + +bool DamageTable::is_dirfrag_damaged( + const CDir *dir_frag) const +{ + return dirfrags.count( + DirFragIdent(dir_frag->inode->ino(), dir_frag->frag)) > 0; +} + +bool DamageTable::is_remote_damaged( + const inodeno_t ino) const +{ + return remotes.count(ino) > 0; +} + +void DamageTable::dump(Formatter *f) const +{ + f->open_array_section("damage_table"); + for (const auto &i : by_id) + { + i.second->dump(f); + } + f->close_section(); +} + +void DamageTable::erase(damage_entry_id_t damage_id) +{ + auto by_id_entry = by_id.find(damage_id); + if (by_id_entry == by_id.end()) { + return; + } + + DamageEntryRef entry = by_id_entry->second; + ceph_assert(entry->id == damage_id); // Sanity + + const auto type = entry->get_type(); + if (type == DAMAGE_ENTRY_DIRFRAG) { + auto dirfrag_entry = std::static_pointer_cast<DirFragDamage>(entry); + dirfrags.erase(DirFragIdent(dirfrag_entry->ino, dirfrag_entry->frag)); + } else if (type == DAMAGE_ENTRY_DENTRY) { + auto dentry_entry = std::static_pointer_cast<DentryDamage>(entry); + dentries.erase(DirFragIdent(dentry_entry->ino, dentry_entry->frag)); + } else if (type == DAMAGE_ENTRY_BACKTRACE) { + auto backtrace_entry = std::static_pointer_cast<BacktraceDamage>(entry); + remotes.erase(backtrace_entry->ino); + } else { + derr << "Invalid type " << type << dendl; + ceph_abort(); + } + + by_id.erase(by_id_entry); +} + |