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MDCache.cc
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MDCache.cc
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// -*- 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 <errno.h>
#include <ostream>
#include <string>
#include <string_view>
#include <map>
#include "MDCache.h"
#include "MDSRank.h"
#include "Server.h"
#include "Locker.h"
#include "MDLog.h"
#include "MDBalancer.h"
#include "Migrator.h"
#include "ScrubStack.h"
#include "SnapClient.h"
#include "MDSMap.h"
#include "CInode.h"
#include "CDir.h"
#include "Mutation.h"
#include "include/ceph_fs.h"
#include "include/filepath.h"
#include "include/util.h"
#include "messages/MClientCaps.h"
#include "msg/Message.h"
#include "msg/Messenger.h"
#include "common/MemoryModel.h"
#include "common/errno.h"
#include "common/perf_counters.h"
#include "common/safe_io.h"
#include "osdc/Journaler.h"
#include "osdc/Filer.h"
#include "events/ESubtreeMap.h"
#include "events/EUpdate.h"
#include "events/EPeerUpdate.h"
#include "events/EImportFinish.h"
#include "events/EFragment.h"
#include "events/ECommitted.h"
#include "events/EPurged.h"
#include "events/ESessions.h"
#include "InoTable.h"
#include "common/Timer.h"
#include "perfglue/heap_profiler.h"
#include "common/config.h"
#include "include/ceph_assert.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix _prefix(_dout, mds)
static ostream& _prefix(std::ostream *_dout, MDSRank *mds) {
return *_dout << "mds." << mds->get_nodeid() << ".cache ";
}
set<int> SimpleLock::empty_gather_set;
/**
* All non-I/O contexts that require a reference
* to an MDCache instance descend from this.
*/
class MDCacheContext : public virtual MDSContext {
protected:
MDCache *mdcache;
MDSRank *get_mds() override
{
ceph_assert(mdcache != NULL);
return mdcache->mds;
}
public:
explicit MDCacheContext(MDCache *mdc_) : mdcache(mdc_) {}
};
/**
* Only for contexts called back from an I/O completion
*
* Note: duplication of members wrt MDCacheContext, because
* it'ls the lesser of two evils compared with introducing
* yet another piece of (multiple) inheritance.
*/
class MDCacheIOContext : public virtual MDSIOContextBase {
protected:
MDCache *mdcache;
MDSRank *get_mds() override
{
ceph_assert(mdcache != NULL);
return mdcache->mds;
}
public:
explicit MDCacheIOContext(MDCache *mdc_, bool track=true) :
MDSIOContextBase(track), mdcache(mdc_) {}
};
class MDCacheLogContext : public virtual MDSLogContextBase {
protected:
MDCache *mdcache;
MDSRank *get_mds() override
{
ceph_assert(mdcache != NULL);
return mdcache->mds;
}
public:
explicit MDCacheLogContext(MDCache *mdc_) : mdcache(mdc_) {}
};
MDCache::MDCache(MDSRank *m, PurgeQueue &purge_queue_) :
mds(m),
open_file_table(m),
filer(m->objecter, m->finisher),
stray_manager(m, purge_queue_),
recovery_queue(m),
trim_counter(g_conf().get_val<double>("mds_cache_trim_decay_rate"))
{
migrator.reset(new Migrator(mds, this));
max_dir_commit_size = g_conf()->mds_dir_max_commit_size ?
(g_conf()->mds_dir_max_commit_size << 20) :
(0.9 *(g_conf()->osd_max_write_size << 20));
cache_memory_limit = g_conf().get_val<Option::size_t>("mds_cache_memory_limit");
cache_reservation = g_conf().get_val<double>("mds_cache_reservation");
cache_health_threshold = g_conf().get_val<double>("mds_health_cache_threshold");
export_ephemeral_distributed_config = g_conf().get_val<bool>("mds_export_ephemeral_distributed");
export_ephemeral_random_config = g_conf().get_val<bool>("mds_export_ephemeral_random");
export_ephemeral_random_max = g_conf().get_val<double>("mds_export_ephemeral_random_max");
lru.lru_set_midpoint(g_conf().get_val<double>("mds_cache_mid"));
bottom_lru.lru_set_midpoint(0);
decayrate.set_halflife(g_conf()->mds_decay_halflife);
upkeeper = std::thread(&MDCache::upkeep_main, this);
}
MDCache::~MDCache()
{
if (logger) {
g_ceph_context->get_perfcounters_collection()->remove(logger.get());
}
if (upkeeper.joinable())
upkeeper.join();
}
void MDCache::handle_conf_change(const std::set<std::string>& changed, const MDSMap& mdsmap)
{
dout(20) << "config changes: " << changed << dendl;
if (changed.count("mds_cache_memory_limit"))
cache_memory_limit = g_conf().get_val<Option::size_t>("mds_cache_memory_limit");
if (changed.count("mds_cache_reservation"))
cache_reservation = g_conf().get_val<double>("mds_cache_reservation");
bool ephemeral_pin_config_changed = false;
if (changed.count("mds_export_ephemeral_distributed")) {
export_ephemeral_distributed_config = g_conf().get_val<bool>("mds_export_ephemeral_distributed");
dout(10) << "Migrating any ephemeral distributed pinned inodes" << dendl;
/* copy to vector to avoid removals during iteration */
ephemeral_pin_config_changed = true;
}
if (changed.count("mds_export_ephemeral_random")) {
export_ephemeral_random_config = g_conf().get_val<bool>("mds_export_ephemeral_random");
dout(10) << "Migrating any ephemeral random pinned inodes" << dendl;
/* copy to vector to avoid removals during iteration */
ephemeral_pin_config_changed = true;
}
if (ephemeral_pin_config_changed) {
std::vector<CInode*> migrate;
migrate.assign(export_ephemeral_pins.begin(), export_ephemeral_pins.end());
for (auto& in : migrate) {
in->maybe_export_pin(true);
}
}
if (changed.count("mds_export_ephemeral_random_max")) {
export_ephemeral_random_max = g_conf().get_val<double>("mds_export_ephemeral_random_max");
}
if (changed.count("mds_health_cache_threshold"))
cache_health_threshold = g_conf().get_val<double>("mds_health_cache_threshold");
if (changed.count("mds_cache_mid"))
lru.lru_set_midpoint(g_conf().get_val<double>("mds_cache_mid"));
if (changed.count("mds_cache_trim_decay_rate")) {
trim_counter = DecayCounter(g_conf().get_val<double>("mds_cache_trim_decay_rate"));
}
migrator->handle_conf_change(changed, mdsmap);
mds->balancer->handle_conf_change(changed, mdsmap);
}
void MDCache::log_stat()
{
mds->logger->set(l_mds_inodes, lru.lru_get_size());
mds->logger->set(l_mds_inodes_pinned, lru.lru_get_num_pinned());
mds->logger->set(l_mds_inodes_top, lru.lru_get_top());
mds->logger->set(l_mds_inodes_bottom, lru.lru_get_bot());
mds->logger->set(l_mds_inodes_pin_tail, lru.lru_get_pintail());
mds->logger->set(l_mds_inodes_with_caps, num_inodes_with_caps);
mds->logger->set(l_mds_caps, Capability::count());
if (root) {
mds->logger->set(l_mds_root_rfiles, root->get_inode()->rstat.rfiles);
mds->logger->set(l_mds_root_rbytes, root->get_inode()->rstat.rbytes);
mds->logger->set(l_mds_root_rsnaps, root->get_inode()->rstat.rsnaps);
}
}
//
bool MDCache::shutdown()
{
{
std::scoped_lock lock(upkeep_mutex);
upkeep_trim_shutdown = true;
upkeep_cvar.notify_one();
}
if (lru.lru_get_size() > 0) {
dout(7) << "WARNING: mdcache shutdown with non-empty cache" << dendl;
//show_cache();
show_subtrees();
//dump();
}
return true;
}
// ====================================================================
// some inode functions
void MDCache::add_inode(CInode *in)
{
// add to inode map
if (in->last == CEPH_NOSNAP) {
auto &p = inode_map[in->ino()];
ceph_assert(!p); // should be no dup inos!
p = in;
} else {
auto &p = snap_inode_map[in->vino()];
ceph_assert(!p); // should be no dup inos!
p = in;
}
if (in->ino() < MDS_INO_SYSTEM_BASE) {
if (in->ino() == CEPH_INO_ROOT)
root = in;
else if (in->ino() == MDS_INO_MDSDIR(mds->get_nodeid()))
myin = in;
else if (in->is_stray()) {
if (MDS_INO_STRAY_OWNER(in->ino()) == mds->get_nodeid()) {
strays[MDS_INO_STRAY_INDEX(in->ino())] = in;
}
}
if (in->is_base())
base_inodes.insert(in);
}
}
void MDCache::remove_inode(CInode *o)
{
dout(14) << "remove_inode " << *o << dendl;
if (o->get_parent_dn()) {
// FIXME: multiple parents?
CDentry *dn = o->get_parent_dn();
ceph_assert(!dn->is_dirty());
dn->dir->unlink_inode(dn); // leave dentry ... FIXME?
}
if (o->is_dirty())
o->mark_clean();
if (o->is_dirty_parent())
o->clear_dirty_parent();
o->clear_scatter_dirty();
o->clear_clientwriteable();
o->item_open_file.remove_myself();
if (o->state_test(CInode::STATE_QUEUEDEXPORTPIN))
export_pin_queue.erase(o);
if (o->state_test(CInode::STATE_DELAYEDEXPORTPIN))
export_pin_delayed_queue.erase(o);
o->clear_ephemeral_pin(true, true);
// remove from inode map
if (o->last == CEPH_NOSNAP) {
inode_map.erase(o->ino());
} else {
o->item_caps.remove_myself();
snap_inode_map.erase(o->vino());
}
clear_taken_inos(o->ino());
if (o->ino() < MDS_INO_SYSTEM_BASE) {
if (o == root) root = 0;
if (o == myin) myin = 0;
if (o->is_stray()) {
if (MDS_INO_STRAY_OWNER(o->ino()) == mds->get_nodeid()) {
strays[MDS_INO_STRAY_INDEX(o->ino())] = 0;
}
}
if (o->is_base())
base_inodes.erase(o);
}
// delete it
ceph_assert(o->get_num_ref() == 0);
delete o;
}
file_layout_t MDCache::gen_default_file_layout(const MDSMap &mdsmap)
{
file_layout_t result = file_layout_t::get_default();
result.pool_id = mdsmap.get_first_data_pool();
return result;
}
file_layout_t MDCache::gen_default_log_layout(const MDSMap &mdsmap)
{
file_layout_t result = file_layout_t::get_default();
result.pool_id = mdsmap.get_metadata_pool();
if (g_conf()->mds_log_segment_size > 0) {
result.object_size = g_conf()->mds_log_segment_size;
result.stripe_unit = g_conf()->mds_log_segment_size;
}
return result;
}
void MDCache::init_layouts()
{
default_file_layout = gen_default_file_layout(*(mds->mdsmap));
default_log_layout = gen_default_log_layout(*(mds->mdsmap));
}
void MDCache::create_unlinked_system_inode(CInode *in, inodeno_t ino, int mode) const
{
auto _inode = in->_get_inode();
_inode->ino = ino;
_inode->version = 1;
_inode->xattr_version = 1;
_inode->mode = 0500 | mode;
_inode->size = 0;
_inode->ctime = _inode->mtime = _inode->btime = ceph_clock_now();
_inode->nlink = 1;
_inode->truncate_size = -1ull;
_inode->change_attr = 0;
_inode->export_pin = MDS_RANK_NONE;
// FIPS zeroization audit 20191117: this memset is not security related.
memset(&_inode->dir_layout, 0, sizeof(_inode->dir_layout));
if (_inode->is_dir()) {
_inode->dir_layout.dl_dir_hash = g_conf()->mds_default_dir_hash;
_inode->rstat.rsubdirs = 1; /* itself */
_inode->rstat.rctime = in->get_inode()->ctime;
} else {
_inode->layout = default_file_layout;
++_inode->rstat.rfiles;
}
_inode->accounted_rstat = _inode->rstat;
if (in->is_base()) {
if (in->is_root())
in->inode_auth = mds_authority_t(mds->get_nodeid(), CDIR_AUTH_UNKNOWN);
else
in->inode_auth = mds_authority_t(mds_rank_t(in->ino() - MDS_INO_MDSDIR_OFFSET), CDIR_AUTH_UNKNOWN);
in->open_snaprealm(); // empty snaprealm
ceph_assert(!in->snaprealm->parent); // created its own
in->snaprealm->srnode.seq = 1;
}
}
CInode *MDCache::create_system_inode(inodeno_t ino, int mode)
{
dout(0) << "creating system inode with ino:" << ino << dendl;
CInode *in = new CInode(this);
create_unlinked_system_inode(in, ino, mode);
add_inode(in);
return in;
}
CInode *MDCache::create_root_inode()
{
CInode *in = create_system_inode(CEPH_INO_ROOT, S_IFDIR|0755);
auto _inode = in->_get_inode();
_inode->uid = g_conf()->mds_root_ino_uid;
_inode->gid = g_conf()->mds_root_ino_gid;
_inode->layout = default_file_layout;
_inode->layout.pool_id = mds->mdsmap->get_first_data_pool();
return in;
}
void MDCache::create_empty_hierarchy(MDSGather *gather)
{
// create root dir
CInode *root = create_root_inode();
// force empty root dir
CDir *rootdir = root->get_or_open_dirfrag(this, frag_t());
adjust_subtree_auth(rootdir, mds->get_nodeid());
rootdir->dir_rep = CDir::REP_ALL; //NONE;
ceph_assert(rootdir->get_fnode()->accounted_fragstat == rootdir->get_fnode()->fragstat);
ceph_assert(rootdir->get_fnode()->fragstat == root->get_inode()->dirstat);
ceph_assert(rootdir->get_fnode()->accounted_rstat == rootdir->get_fnode()->rstat);
/* Do no update rootdir rstat information of the fragment, rstat upkeep magic
* assume version 0 is stale/invalid.
*/
rootdir->mark_complete();
rootdir->_get_fnode()->version = rootdir->pre_dirty();
rootdir->mark_dirty(mds->mdlog->get_current_segment());
rootdir->commit(0, gather->new_sub());
root->store(gather->new_sub());
root->mark_dirty_parent(mds->mdlog->get_current_segment(), true);
root->store_backtrace(gather->new_sub());
}
void MDCache::create_mydir_hierarchy(MDSGather *gather)
{
// create mds dir
CInode *my = create_system_inode(MDS_INO_MDSDIR(mds->get_nodeid()), S_IFDIR);
CDir *mydir = my->get_or_open_dirfrag(this, frag_t());
auto mydir_fnode = mydir->_get_fnode();
adjust_subtree_auth(mydir, mds->get_nodeid());
LogSegment *ls = mds->mdlog->get_current_segment();
// stray dir
for (int i = 0; i < NUM_STRAY; ++i) {
CInode *stray = create_system_inode(MDS_INO_STRAY(mds->get_nodeid(), i), S_IFDIR);
CDir *straydir = stray->get_or_open_dirfrag(this, frag_t());
CachedStackStringStream css;
*css << "stray" << i;
CDentry *sdn = mydir->add_primary_dentry(css->str(), stray, "");
sdn->_mark_dirty(mds->mdlog->get_current_segment());
stray->_get_inode()->dirstat = straydir->get_fnode()->fragstat;
mydir_fnode->rstat.add(stray->get_inode()->rstat);
mydir_fnode->fragstat.nsubdirs++;
// save them
straydir->mark_complete();
straydir->_get_fnode()->version = straydir->pre_dirty();
straydir->mark_dirty(ls);
straydir->commit(0, gather->new_sub());
stray->mark_dirty_parent(ls, true);
stray->store_backtrace(gather->new_sub());
}
mydir_fnode->accounted_fragstat = mydir->get_fnode()->fragstat;
mydir_fnode->accounted_rstat = mydir->get_fnode()->rstat;
auto inode = myin->_get_inode();
inode->dirstat = mydir->get_fnode()->fragstat;
inode->rstat = mydir->get_fnode()->rstat;
++inode->rstat.rsubdirs;
inode->accounted_rstat = inode->rstat;
mydir->mark_complete();
mydir_fnode->version = mydir->pre_dirty();
mydir->mark_dirty(ls);
mydir->commit(0, gather->new_sub());
myin->store(gather->new_sub());
}
struct C_MDC_CreateSystemFile : public MDCacheLogContext {
MutationRef mut;
CDentry *dn;
version_t dpv;
MDSContext *fin;
C_MDC_CreateSystemFile(MDCache *c, MutationRef& mu, CDentry *d, version_t v, MDSContext *f) :
MDCacheLogContext(c), mut(mu), dn(d), dpv(v), fin(f) {}
void finish(int r) override {
mdcache->_create_system_file_finish(mut, dn, dpv, fin);
}
};
void MDCache::_create_system_file(CDir *dir, std::string_view name, CInode *in, MDSContext *fin)
{
dout(10) << "_create_system_file " << name << " in " << *dir << dendl;
CDentry *dn = dir->add_null_dentry(name);
dn->push_projected_linkage(in);
version_t dpv = dn->pre_dirty();
CDir *mdir = 0;
auto inode = in->_get_inode();
if (in->is_dir()) {
inode->rstat.rsubdirs = 1;
mdir = in->get_or_open_dirfrag(this, frag_t());
mdir->mark_complete();
mdir->_get_fnode()->version = mdir->pre_dirty();
} else {
inode->rstat.rfiles = 1;
}
inode->version = dn->pre_dirty();
SnapRealm *realm = dir->get_inode()->find_snaprealm();
dn->first = in->first = realm->get_newest_seq() + 1;
MutationRef mut(new MutationImpl());
// force some locks. hacky.
mds->locker->wrlock_force(&dir->inode->filelock, mut);
mds->locker->wrlock_force(&dir->inode->nestlock, mut);
mut->ls = mds->mdlog->get_current_segment();
EUpdate *le = new EUpdate(mds->mdlog, "create system file");
mds->mdlog->start_entry(le);
if (!in->is_mdsdir()) {
predirty_journal_parents(mut, &le->metablob, in, dir, PREDIRTY_PRIMARY|PREDIRTY_DIR, 1);
le->metablob.add_primary_dentry(dn, in, true);
} else {
predirty_journal_parents(mut, &le->metablob, in, dir, PREDIRTY_DIR, 1);
journal_dirty_inode(mut.get(), &le->metablob, in);
dn->push_projected_linkage(in->ino(), in->d_type());
le->metablob.add_remote_dentry(dn, true, in->ino(), in->d_type());
le->metablob.add_root(true, in);
}
if (mdir)
le->metablob.add_new_dir(mdir); // dirty AND complete AND new
mds->mdlog->submit_entry(le, new C_MDC_CreateSystemFile(this, mut, dn, dpv, fin));
mds->mdlog->flush();
}
void MDCache::_create_system_file_finish(MutationRef& mut, CDentry *dn, version_t dpv, MDSContext *fin)
{
dout(10) << "_create_system_file_finish " << *dn << dendl;
dn->pop_projected_linkage();
dn->mark_dirty(dpv, mut->ls);
CInode *in = dn->get_linkage()->get_inode();
in->mark_dirty(mut->ls);
if (in->is_dir()) {
CDir *dir = in->get_dirfrag(frag_t());
ceph_assert(dir);
dir->mark_dirty(mut->ls);
dir->mark_new(mut->ls);
}
mut->apply();
mds->locker->drop_locks(mut.get());
mut->cleanup();
fin->complete(0);
//if (dir && MDS_INO_IS_MDSDIR(in->ino()))
//migrator->export_dir(dir, (int)in->ino() - MDS_INO_MDSDIR_OFFSET);
}
struct C_MDS_RetryOpenRoot : public MDSInternalContext {
MDCache *cache;
explicit C_MDS_RetryOpenRoot(MDCache *c) : MDSInternalContext(c->mds), cache(c) {}
void finish(int r) override {
if (r < 0) {
// If we can't open root, something disastrous has happened: mark
// this rank damaged for operator intervention. Note that
// it is not okay to call suicide() here because we are in
// a Finisher callback.
cache->mds->damaged();
ceph_abort(); // damaged should never return
} else {
cache->open_root();
}
}
};
void MDCache::open_root_inode(MDSContext *c)
{
if (mds->get_nodeid() == mds->mdsmap->get_root()) {
CInode *in;
in = create_system_inode(CEPH_INO_ROOT, S_IFDIR|0755); // initially inaccurate!
in->fetch(c);
} else {
discover_base_ino(CEPH_INO_ROOT, c, mds->mdsmap->get_root());
}
}
void MDCache::open_mydir_inode(MDSContext *c)
{
CInode *in = create_system_inode(MDS_INO_MDSDIR(mds->get_nodeid()), S_IFDIR|0755); // initially inaccurate!
in->fetch(c);
}
void MDCache::open_mydir_frag(MDSContext *c)
{
open_mydir_inode(
new MDSInternalContextWrapper(mds,
new LambdaContext([this, c](int r) {
if (r < 0) {
c->complete(r);
return;
}
CDir *mydir = myin->get_or_open_dirfrag(this, frag_t());
ceph_assert(mydir);
adjust_subtree_auth(mydir, mds->get_nodeid());
mydir->fetch(c);
})
)
);
}
void MDCache::open_root()
{
dout(10) << "open_root" << dendl;
if (!root) {
open_root_inode(new C_MDS_RetryOpenRoot(this));
return;
}
if (mds->get_nodeid() == mds->mdsmap->get_root()) {
ceph_assert(root->is_auth());
CDir *rootdir = root->get_or_open_dirfrag(this, frag_t());
ceph_assert(rootdir);
if (!rootdir->is_subtree_root())
adjust_subtree_auth(rootdir, mds->get_nodeid());
if (!rootdir->is_complete()) {
rootdir->fetch(new C_MDS_RetryOpenRoot(this));
return;
}
} else {
ceph_assert(!root->is_auth());
CDir *rootdir = root->get_dirfrag(frag_t());
if (!rootdir) {
open_remote_dirfrag(root, frag_t(), new C_MDS_RetryOpenRoot(this));
return;
}
}
if (!myin) {
CInode *in = create_system_inode(MDS_INO_MDSDIR(mds->get_nodeid()), S_IFDIR|0755); // initially inaccurate!
in->fetch(new C_MDS_RetryOpenRoot(this));
return;
}
CDir *mydir = myin->get_or_open_dirfrag(this, frag_t());
ceph_assert(mydir);
adjust_subtree_auth(mydir, mds->get_nodeid());
populate_mydir();
}
void MDCache::advance_stray() {
// check whether the directory has been fragmented
if (stray_fragmenting_index >= 0) {
auto&& dfs = strays[stray_fragmenting_index]->get_dirfrags();
bool any_fragmenting = false;
for (const auto& dir : dfs) {
if (dir->state_test(CDir::STATE_FRAGMENTING) ||
mds->balancer->is_fragment_pending(dir->dirfrag())) {
any_fragmenting = true;
break;
}
}
if (!any_fragmenting)
stray_fragmenting_index = -1;
}
for (int i = 1; i < NUM_STRAY; i++){
stray_index = (stray_index + i) % NUM_STRAY;
if (stray_index != stray_fragmenting_index)
break;
}
if (stray_fragmenting_index == -1 && is_open()) {
// Fragment later stray dir in advance. We don't choose past
// stray dir because in-flight requests may still use it.
stray_fragmenting_index = (stray_index + 3) % NUM_STRAY;
auto&& dfs = strays[stray_fragmenting_index]->get_dirfrags();
bool any_fragmenting = false;
for (const auto& dir : dfs) {
if (dir->should_split()) {
mds->balancer->queue_split(dir, true);
any_fragmenting = true;
} else if (dir->should_merge()) {
mds->balancer->queue_merge(dir);
any_fragmenting = true;
}
}
if (!any_fragmenting)
stray_fragmenting_index = -1;
}
dout(10) << "advance_stray to index " << stray_index
<< " fragmenting index " << stray_fragmenting_index << dendl;
}
void MDCache::populate_mydir()
{
ceph_assert(myin);
CDir *mydir = myin->get_or_open_dirfrag(this, frag_t());
ceph_assert(mydir);
dout(10) << "populate_mydir " << *mydir << dendl;
if (!mydir->is_complete()) {
mydir->fetch(new C_MDS_RetryOpenRoot(this));
return;
}
if (mydir->get_version() == 0 && mydir->state_test(CDir::STATE_BADFRAG)) {
// A missing dirfrag, we will recreate it. Before that, we must dirty
// it before dirtying any of the strays we create within it.
mds->clog->warn() << "fragment " << mydir->dirfrag() << " was unreadable, "
"recreating it now";
LogSegment *ls = mds->mdlog->get_current_segment();
mydir->state_clear(CDir::STATE_BADFRAG);
mydir->mark_complete();
mydir->_get_fnode()->version = mydir->pre_dirty();
mydir->mark_dirty(ls);
}
// open or create stray
uint64_t num_strays = 0;
for (int i = 0; i < NUM_STRAY; ++i) {
CachedStackStringStream css;
*css << "stray" << i;
CDentry *straydn = mydir->lookup(css->str());
// allow for older fs's with stray instead of stray0
if (straydn == NULL && i == 0)
straydn = mydir->lookup("stray");
if (!straydn || !straydn->get_linkage()->get_inode()) {
_create_system_file(mydir, css->strv(), create_system_inode(MDS_INO_STRAY(mds->get_nodeid(), i), S_IFDIR),
new C_MDS_RetryOpenRoot(this));
return;
}
ceph_assert(straydn);
ceph_assert(strays[i]);
// we make multiple passes through this method; make sure we only pin each stray once.
if (!strays[i]->state_test(CInode::STATE_STRAYPINNED)) {
strays[i]->get(CInode::PIN_STRAY);
strays[i]->state_set(CInode::STATE_STRAYPINNED);
strays[i]->get_stickydirs();
}
dout(20) << " stray num " << i << " is " << *strays[i] << dendl;
// open all frags
frag_vec_t leaves;
strays[i]->dirfragtree.get_leaves(leaves);
for (const auto& leaf : leaves) {
CDir *dir = strays[i]->get_dirfrag(leaf);
if (!dir) {
dir = strays[i]->get_or_open_dirfrag(this, leaf);
}
// DamageTable applies special handling to strays: it will
// have damaged() us out if one is damaged.
ceph_assert(!dir->state_test(CDir::STATE_BADFRAG));
if (dir->get_version() == 0) {
dir->fetch(new C_MDS_RetryOpenRoot(this));
return;
}
if (dir->get_frag_size() > 0)
num_strays += dir->get_frag_size();
}
}
// okay!
dout(10) << "populate_mydir done" << dendl;
ceph_assert(!open);
open = true;
mds->queue_waiters(waiting_for_open);
stray_manager.set_num_strays(num_strays);
stray_manager.activate();
scan_stray_dir();
}
void MDCache::open_foreign_mdsdir(inodeno_t ino, MDSContext *fin)
{
discover_base_ino(ino, fin, mds_rank_t(ino & (MAX_MDS-1)));
}
CDir *MDCache::get_stray_dir(CInode *in)
{
string straydname;
in->name_stray_dentry(straydname);
CInode *strayi = get_stray();
ceph_assert(strayi);
frag_t fg = strayi->pick_dirfrag(straydname);
CDir *straydir = strayi->get_dirfrag(fg);
ceph_assert(straydir);
return straydir;
}
MDSCacheObject *MDCache::get_object(const MDSCacheObjectInfo &info)
{
// inode?
if (info.ino)
return get_inode(info.ino, info.snapid);
// dir or dentry.
CDir *dir = get_dirfrag(info.dirfrag);
if (!dir) return 0;
if (info.dname.length())
return dir->lookup(info.dname, info.snapid);
else
return dir;
}
// ====================================================================
// consistent hash ring
/*
* hashing implementation based on Lamping and Veach's Jump Consistent Hash: https://arxiv.org/pdf/1406.2294.pdf
*/
mds_rank_t MDCache::hash_into_rank_bucket(inodeno_t ino, frag_t fg)
{
const mds_rank_t max_mds = mds->mdsmap->get_max_mds();
uint64_t hash = rjhash64(ino);
if (fg)
hash = rjhash64(hash + rjhash64(fg.value()));
int64_t b = -1, j = 0;
while (j < max_mds) {
b = j;
hash = hash*2862933555777941757ULL + 1;
j = (b + 1) * (double(1LL << 31) / double((hash >> 33) + 1));
}
// verify bounds before returning
auto result = mds_rank_t(b);
ceph_assert(result >= 0 && result < max_mds);
return result;
}
// ====================================================================
// subtree management
/*
* adjust the dir_auth of a subtree.
* merge with parent and/or child subtrees, if is it appropriate.
* merge can ONLY happen if both parent and child have unambiguous auth.
*/
void MDCache::adjust_subtree_auth(CDir *dir, mds_authority_t auth, bool adjust_pop)
{
dout(7) << "adjust_subtree_auth " << dir->get_dir_auth() << " -> " << auth
<< " on " << *dir << dendl;
show_subtrees();
CDir *root;
if (dir->inode->is_base()) {
root = dir; // bootstrap hack.
if (subtrees.count(root) == 0) {
subtrees[root];
root->get(CDir::PIN_SUBTREE);
}
} else {
root = get_subtree_root(dir); // subtree root
}
ceph_assert(root);
ceph_assert(subtrees.count(root));
dout(7) << " current root is " << *root << dendl;
if (root == dir) {
// i am already a subtree.
dir->set_dir_auth(auth);
} else {
// i am a new subtree.
dout(10) << " new subtree at " << *dir << dendl;
ceph_assert(subtrees.count(dir) == 0);
subtrees[dir]; // create empty subtree bounds list for me.
dir->get(CDir::PIN_SUBTREE);
// set dir_auth
dir->set_dir_auth(auth);
// move items nested beneath me, under me.
set<CDir*>::iterator p = subtrees[root].begin();
while (p != subtrees[root].end()) {
set<CDir*>::iterator next = p;
++next;
if (get_subtree_root((*p)->get_parent_dir()) == dir) {
// move under me
dout(10) << " claiming child bound " << **p << dendl;
subtrees[dir].insert(*p);
subtrees[root].erase(p);
}
p = next;
}
// i am a bound of the parent subtree.
subtrees[root].insert(dir);
// i am now the subtree root.
root = dir;
// adjust recursive pop counters
if (adjust_pop && dir->is_auth()) {
CDir *p = dir->get_parent_dir();
while (p) {
p->pop_auth_subtree.sub(dir->pop_auth_subtree);
if (p->is_subtree_root()) break;
p = p->inode->get_parent_dir();
}
}
}
show_subtrees();
}
void MDCache::try_subtree_merge(CDir *dir)
{
dout(7) << "try_subtree_merge " << *dir << dendl;
// record my old bounds
auto oldbounds = subtrees.at(dir);
set<CInode*> to_eval;
// try merge at my root
try_subtree_merge_at(dir, &to_eval);
// try merge at my old bounds
for (auto bound : oldbounds)
try_subtree_merge_at(bound, &to_eval);
if (!(mds->is_any_replay() || mds->is_resolve())) {
for(auto in : to_eval)
eval_subtree_root(in);
}
}
void MDCache::try_subtree_merge_at(CDir *dir, set<CInode*> *to_eval, bool adjust_pop)
{
dout(10) << "try_subtree_merge_at " << *dir << dendl;
if (dir->dir_auth.second != CDIR_AUTH_UNKNOWN ||
dir->state_test(CDir::STATE_EXPORTBOUND) ||
dir->state_test(CDir::STATE_AUXSUBTREE))
return;
auto it = subtrees.find(dir);
ceph_assert(it != subtrees.end());
// merge with parent?
CDir *parent = dir;
if (!dir->inode->is_base())
parent = get_subtree_root(dir->get_parent_dir());
if (parent != dir && // we have a parent,
parent->dir_auth == dir->dir_auth) { // auth matches,
// merge with parent.
dout(10) << " subtree merge at " << *dir << dendl;
dir->set_dir_auth(CDIR_AUTH_DEFAULT);
// move our bounds under the parent
subtrees[parent].insert(it->second.begin(), it->second.end());
// we are no longer a subtree or bound