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CDir.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 <[email protected]>
*
* 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 "include/types.h"
#include "CDir.h"
#include "CDentry.h"
#include "CInode.h"
#include "Mutation.h"
#include "MDSMap.h"
#include "MDSRank.h"
#include "MDCache.h"
#include "Locker.h"
#include "MDLog.h"
#include "LogSegment.h"
#include "common/bloom_filter.hpp"
#include "include/Context.h"
#include "common/Clock.h"
#include "osdc/Objecter.h"
#include "common/config.h"
#include "include/assert.h"
#include "include/compat.h"
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << cache->mds->get_nodeid() << ".cache.dir(" << this->dirfrag() << ") "
int CDir::num_frozen_trees = 0;
int CDir::num_freezing_trees = 0;
class CDirContext : public MDSInternalContextBase
{
protected:
CDir *dir;
MDSRank* get_mds() {return dir->cache->mds;}
public:
CDirContext(CDir *d) : dir(d) {
assert(dir != NULL);
}
};
class CDirIOContext : public MDSIOContextBase
{
protected:
CDir *dir;
MDSRank* get_mds() {return dir->cache->mds;}
public:
CDirIOContext(CDir *d) : dir(d) {
assert(dir != NULL);
}
};
// PINS
//int cdir_pins[CDIR_NUM_PINS] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
boost::pool<> CDir::pool(sizeof(CDir));
ostream& operator<<(ostream& out, const CDir& dir)
{
string path;
dir.get_inode()->make_path_string_projected(path);
out << "[dir " << dir.dirfrag() << " " << path << "/"
<< " [" << dir.first << ",head]";
if (dir.is_auth()) {
out << " auth";
if (dir.is_replicated())
out << dir.get_replicas();
if (dir.is_projected())
out << " pv=" << dir.get_projected_version();
out << " v=" << dir.get_version();
out << " cv=" << dir.get_committing_version();
out << "/" << dir.get_committed_version();
} else {
mds_authority_t a = dir.authority();
out << " rep@" << a.first;
if (a.second != CDIR_AUTH_UNKNOWN)
out << "," << a.second;
out << "." << dir.get_replica_nonce();
}
if (dir.is_rep()) out << " REP";
if (dir.get_dir_auth() != CDIR_AUTH_DEFAULT) {
if (dir.get_dir_auth().second == CDIR_AUTH_UNKNOWN)
out << " dir_auth=" << dir.get_dir_auth().first;
else
out << " dir_auth=" << dir.get_dir_auth();
}
if (dir.get_cum_auth_pins())
out << " ap=" << dir.get_auth_pins()
<< "+" << dir.get_dir_auth_pins()
<< "+" << dir.get_nested_auth_pins();
out << " state=" << dir.get_state();
if (dir.state_test(CDir::STATE_COMPLETE)) out << "|complete";
if (dir.state_test(CDir::STATE_FREEZINGTREE)) out << "|freezingtree";
if (dir.state_test(CDir::STATE_FROZENTREE)) out << "|frozentree";
//if (dir.state_test(CDir::STATE_FROZENTREELEAF)) out << "|frozentreeleaf";
if (dir.state_test(CDir::STATE_FROZENDIR)) out << "|frozendir";
if (dir.state_test(CDir::STATE_FREEZINGDIR)) out << "|freezingdir";
if (dir.state_test(CDir::STATE_EXPORTBOUND)) out << "|exportbound";
if (dir.state_test(CDir::STATE_IMPORTBOUND)) out << "|importbound";
if (dir.state_test(CDir::STATE_BADFRAG)) out << "|badfrag";
// fragstat
out << " " << dir.fnode.fragstat;
if (!(dir.fnode.fragstat == dir.fnode.accounted_fragstat))
out << "/" << dir.fnode.accounted_fragstat;
if (g_conf->mds_debug_scatterstat && dir.is_projected()) {
const fnode_t *pf = dir.get_projected_fnode();
out << "->" << pf->fragstat;
if (!(pf->fragstat == pf->accounted_fragstat))
out << "/" << pf->accounted_fragstat;
}
// rstat
out << " " << dir.fnode.rstat;
if (!(dir.fnode.rstat == dir.fnode.accounted_rstat))
out << "/" << dir.fnode.accounted_rstat;
if (g_conf->mds_debug_scatterstat && dir.is_projected()) {
const fnode_t *pf = dir.get_projected_fnode();
out << "->" << pf->rstat;
if (!(pf->rstat == pf->accounted_rstat))
out << "/" << pf->accounted_rstat;
}
out << " hs=" << dir.get_num_head_items() << "+" << dir.get_num_head_null();
out << ",ss=" << dir.get_num_snap_items() << "+" << dir.get_num_snap_null();
if (dir.get_num_dirty())
out << " dirty=" << dir.get_num_dirty();
if (dir.get_num_ref()) {
out << " |";
dir.print_pin_set(out);
}
out << " " << &dir;
return out << "]";
}
void CDir::print(ostream& out)
{
out << *this;
}
ostream& CDir::print_db_line_prefix(ostream& out)
{
return out << ceph_clock_now(g_ceph_context) << " mds." << cache->mds->get_nodeid() << ".cache.dir(" << this->dirfrag() << ") ";
}
// -------------------------------------------------------------------
// CDir
CDir::CDir(CInode *in, frag_t fg, MDCache *mdcache, bool auth) :
dirty_rstat_inodes(member_offset(CInode, dirty_rstat_item)),
item_dirty(this), item_new(this),
pop_me(ceph_clock_now(g_ceph_context)),
pop_nested(ceph_clock_now(g_ceph_context)),
pop_auth_subtree(ceph_clock_now(g_ceph_context)),
pop_auth_subtree_nested(ceph_clock_now(g_ceph_context)),
bloom(NULL)
{
g_num_dir++;
g_num_dira++;
inode = in;
frag = fg;
this->cache = mdcache;
first = 2;
num_head_items = num_head_null = 0;
num_snap_items = num_snap_null = 0;
num_dirty = 0;
num_dentries_nested = 0;
num_dentries_auth_subtree = 0;
num_dentries_auth_subtree_nested = 0;
state = STATE_INITIAL;
memset(&fnode, 0, sizeof(fnode));
projected_version = 0;
committing_version = 0;
committed_version = 0;
// dir_auth
dir_auth = CDIR_AUTH_DEFAULT;
// auth
assert(in->is_dir());
if (auth)
state |= STATE_AUTH;
dir_auth_pins = 0;
request_pins = 0;
dir_rep = REP_NONE;
}
/**
* Check the recursive statistics on size for consistency.
* If mds_debug_scatterstat is enabled, assert for correctness,
* otherwise just print out the mismatch and continue.
*/
bool CDir::check_rstats()
{
if (!g_conf->mds_debug_scatterstat)
return true;
dout(25) << "check_rstats on " << this << dendl;
if (!is_complete() || !is_auth() || is_frozen()) {
dout(10) << "check_rstats bailing out -- incomplete or non-auth or frozen dir!" << dendl;
return true;
}
// fragstat
if(!(get_num_head_items()==
(fnode.fragstat.nfiles + fnode.fragstat.nsubdirs))) {
dout(1) << "mismatch between head items and fnode.fragstat! printing dentries" << dendl;
dout(1) << "get_num_head_items() = " << get_num_head_items()
<< "; fnode.fragstat.nfiles=" << fnode.fragstat.nfiles
<< " fnode.fragstat.nsubdirs=" << fnode.fragstat.nsubdirs << dendl;
for (map_t::iterator i = items.begin(); i != items.end(); ++i) {
//if (i->second->get_linkage()->is_primary())
dout(1) << *(i->second) << dendl;
}
assert(get_num_head_items() == (fnode.fragstat.nfiles + fnode.fragstat.nsubdirs));
} else {
dout(20) << "get_num_head_items() = " << get_num_head_items()
<< "; fnode.fragstat.nfiles=" << fnode.fragstat.nfiles
<< " fnode.fragstat.nsubdirs=" << fnode.fragstat.nsubdirs << dendl;
}
// rstat
nest_info_t sub_info;
for (map_t::iterator i = items.begin(); i != items.end(); ++i) {
if (i->second->get_linkage()->is_primary() &&
i->second->last == CEPH_NOSNAP) {
sub_info.add(i->second->get_linkage()->inode->inode.accounted_rstat);
}
}
if ((!(sub_info.rbytes == fnode.rstat.rbytes)) ||
(!(sub_info.rfiles == fnode.rstat.rfiles)) ||
(!(sub_info.rsubdirs == fnode.rstat.rsubdirs))) {
dout(1) << "mismatch between child accounted_rstats and my rstats!" << dendl;
dout(1) << "total of child dentrys: " << sub_info << dendl;
dout(1) << "my rstats: " << fnode.rstat << dendl;
for (map_t::iterator i = items.begin(); i != items.end(); ++i) {
if (i->second->get_linkage()->is_primary()) {
dout(1) << *(i->second) << " "
<< i->second->get_linkage()->inode->inode.accounted_rstat
<< dendl;
}
}
} else {
dout(25) << "total of child dentrys: " << sub_info << dendl;
dout(25) << "my rstats: " << fnode.rstat << dendl;
}
assert(sub_info.rbytes == fnode.rstat.rbytes);
assert(sub_info.rfiles == fnode.rstat.rfiles);
assert(sub_info.rsubdirs == fnode.rstat.rsubdirs);
dout(10) << "check_rstats complete on " << this << dendl;
return true;
}
CDentry *CDir::lookup(const char *name, snapid_t snap)
{
dout(20) << "lookup (" << snap << ", '" << name << "')" << dendl;
map_t::iterator iter = items.lower_bound(dentry_key_t(snap, name));
if (iter == items.end())
return 0;
if (iter->second->name == name &&
iter->second->first <= snap) {
dout(20) << " hit -> " << iter->first << dendl;
return iter->second;
}
dout(20) << " miss -> " << iter->first << dendl;
return 0;
}
/***
* linking fun
*/
CDentry* CDir::add_null_dentry(const string& dname,
snapid_t first, snapid_t last)
{
// foreign
assert(lookup_exact_snap(dname, last) == 0);
// create dentry
CDentry* dn = new CDentry(dname, inode->hash_dentry_name(dname), first, last);
if (is_auth())
dn->state_set(CDentry::STATE_AUTH);
cache->lru.lru_insert_mid(dn);
dn->dir = this;
dn->version = get_projected_version();
// add to dir
assert(items.count(dn->key()) == 0);
//assert(null_items.count(dn->name) == 0);
items[dn->key()] = dn;
if (last == CEPH_NOSNAP)
num_head_null++;
else
num_snap_null++;
if (state_test(CDir::STATE_DNPINNEDFRAG)) {
dn->get(CDentry::PIN_FRAGMENTING);
dn->state_set(CDentry::STATE_FRAGMENTING);
}
dout(12) << "add_null_dentry " << *dn << dendl;
// pin?
if (get_num_any() == 1)
get(PIN_CHILD);
assert(get_num_any() == items.size());
return dn;
}
CDentry* CDir::add_primary_dentry(const string& dname, CInode *in,
snapid_t first, snapid_t last)
{
// primary
assert(lookup_exact_snap(dname, last) == 0);
// create dentry
CDentry* dn = new CDentry(dname, inode->hash_dentry_name(dname), first, last);
if (is_auth())
dn->state_set(CDentry::STATE_AUTH);
cache->lru.lru_insert_mid(dn);
dn->dir = this;
dn->version = get_projected_version();
// add to dir
assert(items.count(dn->key()) == 0);
//assert(null_items.count(dn->name) == 0);
items[dn->key()] = dn;
dn->get_linkage()->inode = in;
in->set_primary_parent(dn);
link_inode_work(dn, in);
if (dn->last == CEPH_NOSNAP)
num_head_items++;
else
num_snap_items++;
if (state_test(CDir::STATE_DNPINNEDFRAG)) {
dn->get(CDentry::PIN_FRAGMENTING);
dn->state_set(CDentry::STATE_FRAGMENTING);
}
dout(12) << "add_primary_dentry " << *dn << dendl;
// pin?
if (get_num_any() == 1)
get(PIN_CHILD);
assert(get_num_any() == items.size());
return dn;
}
CDentry* CDir::add_remote_dentry(const string& dname, inodeno_t ino, unsigned char d_type,
snapid_t first, snapid_t last)
{
// foreign
assert(lookup_exact_snap(dname, last) == 0);
// create dentry
CDentry* dn = new CDentry(dname, inode->hash_dentry_name(dname), ino, d_type, first, last);
if (is_auth())
dn->state_set(CDentry::STATE_AUTH);
cache->lru.lru_insert_mid(dn);
dn->dir = this;
dn->version = get_projected_version();
// add to dir
assert(items.count(dn->key()) == 0);
//assert(null_items.count(dn->name) == 0);
items[dn->key()] = dn;
if (last == CEPH_NOSNAP)
num_head_items++;
else
num_snap_items++;
if (state_test(CDir::STATE_DNPINNEDFRAG)) {
dn->get(CDentry::PIN_FRAGMENTING);
dn->state_set(CDentry::STATE_FRAGMENTING);
}
dout(12) << "add_remote_dentry " << *dn << dendl;
// pin?
if (get_num_any() == 1)
get(PIN_CHILD);
assert(get_num_any() == items.size());
return dn;
}
void CDir::remove_dentry(CDentry *dn)
{
dout(12) << "remove_dentry " << *dn << dendl;
// there should be no client leases at this point!
assert(dn->client_lease_map.empty());
if (state_test(CDir::STATE_DNPINNEDFRAG)) {
dn->put(CDentry::PIN_FRAGMENTING);
dn->state_clear(CDentry::STATE_FRAGMENTING);
}
if (dn->get_linkage()->is_null()) {
if (dn->last == CEPH_NOSNAP)
num_head_null--;
else
num_snap_null--;
} else {
if (dn->last == CEPH_NOSNAP)
num_head_items--;
else
num_snap_items--;
}
if (!dn->get_linkage()->is_null())
// detach inode and dentry
unlink_inode_work(dn);
// remove from list
assert(items.count(dn->key()) == 1);
items.erase(dn->key());
// clean?
if (dn->is_dirty())
dn->mark_clean();
cache->lru.lru_remove(dn);
delete dn;
// unpin?
if (get_num_any() == 0)
put(PIN_CHILD);
assert(get_num_any() == items.size());
}
void CDir::link_remote_inode(CDentry *dn, CInode *in)
{
link_remote_inode(dn, in->ino(), IFTODT(in->get_projected_inode()->mode));
}
void CDir::link_remote_inode(CDentry *dn, inodeno_t ino, unsigned char d_type)
{
dout(12) << "link_remote_inode " << *dn << " remote " << ino << dendl;
assert(dn->get_linkage()->is_null());
dn->get_linkage()->set_remote(ino, d_type);
if (dn->last == CEPH_NOSNAP) {
num_head_items++;
num_head_null--;
} else {
num_snap_items++;
num_snap_null--;
}
assert(get_num_any() == items.size());
}
void CDir::link_primary_inode(CDentry *dn, CInode *in)
{
dout(12) << "link_primary_inode " << *dn << " " << *in << dendl;
assert(dn->get_linkage()->is_null());
dn->get_linkage()->inode = in;
in->set_primary_parent(dn);
link_inode_work(dn, in);
if (dn->last == CEPH_NOSNAP) {
num_head_items++;
num_head_null--;
} else {
num_snap_items++;
num_snap_null--;
}
assert(get_num_any() == items.size());
}
void CDir::link_inode_work( CDentry *dn, CInode *in)
{
assert(dn->get_linkage()->get_inode() == in);
assert(in->get_parent_dn() == dn);
// set inode version
//in->inode.version = dn->get_version();
// pin dentry?
if (in->get_num_ref())
dn->get(CDentry::PIN_INODEPIN);
// adjust auth pin count
if (in->auth_pins + in->nested_auth_pins)
dn->adjust_nested_auth_pins(in->auth_pins + in->nested_auth_pins, in->auth_pins, NULL);
// verify open snaprealm parent
if (in->snaprealm)
in->snaprealm->adjust_parent();
}
void CDir::unlink_inode(CDentry *dn)
{
if (dn->get_linkage()->is_remote()) {
dout(12) << "unlink_inode " << *dn << dendl;
} else {
dout(12) << "unlink_inode " << *dn << " " << *dn->get_linkage()->get_inode() << dendl;
}
unlink_inode_work(dn);
if (dn->last == CEPH_NOSNAP) {
num_head_items--;
num_head_null++;
} else {
num_snap_items--;
num_snap_null++;
}
assert(get_num_any() == items.size());
}
void CDir::try_remove_unlinked_dn(CDentry *dn)
{
assert(dn->dir == this);
assert(dn->get_linkage()->is_null());
// no pins (besides dirty)?
if (dn->get_num_ref() != dn->is_dirty())
return;
// was the dn new?
if (dn->is_new()) {
dout(10) << "try_remove_unlinked_dn " << *dn << " in " << *this << dendl;
if (dn->is_dirty())
dn->mark_clean();
remove_dentry(dn);
// NOTE: we may not have any more dirty dentries, but the fnode
// still changed, so the directory must remain dirty.
}
}
void CDir::unlink_inode_work( CDentry *dn )
{
CInode *in = dn->get_linkage()->get_inode();
if (dn->get_linkage()->is_remote()) {
// remote
if (in)
dn->unlink_remote(dn->get_linkage());
dn->get_linkage()->set_remote(0, 0);
} else {
// primary
assert(dn->get_linkage()->is_primary());
// unpin dentry?
if (in->get_num_ref())
dn->put(CDentry::PIN_INODEPIN);
// unlink auth_pin count
if (in->auth_pins + in->nested_auth_pins)
dn->adjust_nested_auth_pins(0 - (in->auth_pins + in->nested_auth_pins), 0 - in->auth_pins, NULL);
// detach inode
in->remove_primary_parent(dn);
dn->get_linkage()->inode = 0;
}
}
void CDir::add_to_bloom(CDentry *dn)
{
assert(dn->last == CEPH_NOSNAP);
if (!bloom) {
/* not create bloom filter for incomplete dir that was added by log replay */
if (!is_complete())
return;
unsigned size = get_num_head_items() + get_num_snap_items();
if (size < 100) size = 100;
bloom = new bloom_filter(size, 1.0 / size, 0);
}
/* This size and false positive probability is completely random.*/
bloom->insert(dn->name.c_str(), dn->name.size());
}
bool CDir::is_in_bloom(const string& name)
{
if (!bloom)
return false;
return bloom->contains(name.c_str(), name.size());
}
void CDir::remove_bloom()
{
delete bloom;
bloom = NULL;
}
void CDir::remove_null_dentries() {
dout(12) << "remove_null_dentries " << *this << dendl;
CDir::map_t::iterator p = items.begin();
while (p != items.end()) {
CDentry *dn = p->second;
++p;
if (dn->get_linkage()->is_null() && !dn->is_projected())
remove_dentry(dn);
}
assert(num_snap_null == 0);
assert(num_head_null == 0);
assert(get_num_any() == items.size());
}
/** remove dirty null dentries for deleted directory. the dirfrag will be
* deleted soon, so it's safe to not commit dirty dentries.
*
* This is called when a directory is being deleted, a prerequisite
* of which is that its children have been unlinked: we expect to only see
* null, unprojected dentries here.
*/
void CDir::try_remove_dentries_for_stray()
{
dout(10) << __func__ << dendl;
assert(inode->inode.nlink == 0);
// clear dirty only when the directory was not snapshotted
bool clear_dirty = !inode->snaprealm;
CDir::map_t::iterator p = items.begin();
while (p != items.end()) {
CDentry *dn = p->second;
++p;
if (dn->last == CEPH_NOSNAP) {
assert(!dn->is_projected());
assert(dn->get_linkage()->is_null());
if (clear_dirty && dn->is_dirty())
dn->mark_clean();
// It's OK to remove lease prematurely because we will never link
// the dentry to inode again.
if (dn->is_any_leases())
dn->remove_client_leases(cache->mds->locker);
if (dn->get_num_ref() == 0)
remove_dentry(dn);
} else {
assert(!dn->is_projected());
CDentry::linkage_t *dnl= dn->get_linkage();
CInode *in = NULL;
if (dnl->is_primary()) {
in = dnl->get_inode();
if (clear_dirty && in->is_dirty())
in->mark_clean();
}
if (clear_dirty && dn->is_dirty())
dn->mark_clean();
if (dn->get_num_ref() == 0) {
remove_dentry(dn);
if (in)
cache->remove_inode(in);
}
}
}
if (clear_dirty && is_dirty())
mark_clean();
}
void CDir::touch_dentries_bottom() {
dout(12) << "touch_dentries_bottom " << *this << dendl;
for (CDir::map_t::iterator p = items.begin();
p != items.end();
++p)
inode->mdcache->touch_dentry_bottom(p->second);
}
bool CDir::try_trim_snap_dentry(CDentry *dn, const set<snapid_t>& snaps)
{
assert(dn->last != CEPH_NOSNAP);
set<snapid_t>::const_iterator p = snaps.lower_bound(dn->first);
CDentry::linkage_t *dnl= dn->get_linkage();
CInode *in = 0;
if (dnl->is_primary())
in = dnl->get_inode();
if ((p == snaps.end() || *p > dn->last) &&
(dn->get_num_ref() == dn->is_dirty()) &&
(!in || in->get_num_ref() == in->is_dirty())) {
dout(10) << " purging snapped " << *dn << dendl;
if (in && in->is_dirty())
in->mark_clean();
remove_dentry(dn);
if (in) {
dout(10) << " purging snapped " << *in << dendl;
cache->remove_inode(in);
}
return true;
}
return false;
}
void CDir::purge_stale_snap_data(const set<snapid_t>& snaps)
{
dout(10) << "purge_stale_snap_data " << snaps << dendl;
CDir::map_t::iterator p = items.begin();
while (p != items.end()) {
CDentry *dn = p->second;
++p;
if (dn->last == CEPH_NOSNAP)
continue;
try_trim_snap_dentry(dn, snaps);
}
}
/**
* steal_dentry -- semi-violently move a dentry from one CDir to another
* (*) violently, in that nitems, most pins, etc. are not correctly maintained
* on the old CDir corpse; must call finish_old_fragment() when finished.
*/
void CDir::steal_dentry(CDentry *dn)
{
dout(15) << "steal_dentry " << *dn << dendl;
items[dn->key()] = dn;
dn->dir->items.erase(dn->key());
if (dn->dir->items.empty())
dn->dir->put(PIN_CHILD);
if (get_num_any() == 0)
get(PIN_CHILD);
if (dn->get_linkage()->is_null()) {
if (dn->last == CEPH_NOSNAP)
num_head_null++;
else
num_snap_null++;
} else if (dn->last == CEPH_NOSNAP) {
num_head_items++;
if (dn->get_linkage()->is_primary()) {
CInode *in = dn->get_linkage()->get_inode();
inode_t *pi = in->get_projected_inode();
if (dn->get_linkage()->get_inode()->is_dir())
fnode.fragstat.nsubdirs++;
else
fnode.fragstat.nfiles++;
fnode.rstat.rbytes += pi->accounted_rstat.rbytes;
fnode.rstat.rfiles += pi->accounted_rstat.rfiles;
fnode.rstat.rsubdirs += pi->accounted_rstat.rsubdirs;
fnode.rstat.rsnaprealms += pi->accounted_rstat.rsnaprealms;
if (pi->accounted_rstat.rctime > fnode.rstat.rctime)
fnode.rstat.rctime = pi->accounted_rstat.rctime;
// move dirty inode rstat to new dirfrag
if (in->is_dirty_rstat())
dirty_rstat_inodes.push_back(&in->dirty_rstat_item);
} else if (dn->get_linkage()->is_remote()) {
if (dn->get_linkage()->get_remote_d_type() == DT_DIR)
fnode.fragstat.nsubdirs++;
else
fnode.fragstat.nfiles++;
}
} else {
num_snap_items++;
if (dn->get_linkage()->is_primary()) {
CInode *in = dn->get_linkage()->get_inode();
if (in->is_dirty_rstat())
dirty_rstat_inodes.push_back(&in->dirty_rstat_item);
}
}
if (dn->auth_pins || dn->nested_auth_pins) {
// use the helpers here to maintain the auth_pin invariants on the dir inode
int ap = dn->get_num_auth_pins() + dn->get_num_nested_auth_pins();
int dap = dn->get_num_dir_auth_pins();
assert(dap <= ap);
adjust_nested_auth_pins(ap, dap, NULL);
dn->dir->adjust_nested_auth_pins(-ap, -dap, NULL);
}
if (dn->is_dirty())
num_dirty++;
dn->dir = this;
}
void CDir::prepare_old_fragment(bool replay)
{
// auth_pin old fragment for duration so that any auth_pinning
// during the dentry migration doesn't trigger side effects
if (!replay && is_auth())
auth_pin(this);
}
void CDir::prepare_new_fragment(bool replay)
{
if (!replay && is_auth()) {
_freeze_dir();
mark_complete();
}
}
void CDir::finish_old_fragment(list<MDSInternalContextBase*>& waiters, bool replay)
{
// take waiters _before_ unfreeze...
if (!replay) {
take_waiting(WAIT_ANY_MASK, waiters);
if (is_auth()) {
auth_unpin(this); // pinned in prepare_old_fragment
assert(is_frozen_dir());
unfreeze_dir();
}
}
assert(nested_auth_pins == 0);
assert(dir_auth_pins == 0);
assert(auth_pins == 0);
num_head_items = num_head_null = 0;
num_snap_items = num_snap_null = 0;
// this mirrors init_fragment_pins()
if (is_auth())
clear_replica_map();
if (is_dirty())
mark_clean();
if (state_test(STATE_IMPORTBOUND))
put(PIN_IMPORTBOUND);
if (state_test(STATE_EXPORTBOUND))
put(PIN_EXPORTBOUND);
if (is_subtree_root())
put(PIN_SUBTREE);
if (auth_pins > 0)
put(PIN_AUTHPIN);
assert(get_num_ref() == (state_test(STATE_STICKY) ? 1:0));
}
void CDir::init_fragment_pins()
{
if (!replica_map.empty())
get(PIN_REPLICATED);
if (state_test(STATE_DIRTY))
get(PIN_DIRTY);
if (state_test(STATE_EXPORTBOUND))
get(PIN_EXPORTBOUND);
if (state_test(STATE_IMPORTBOUND))
get(PIN_IMPORTBOUND);
if (is_subtree_root())
get(PIN_SUBTREE);
}
void CDir::split(int bits, list<CDir*>& subs, list<MDSInternalContextBase*>& waiters, bool replay)
{
dout(10) << "split by " << bits << " bits on " << *this << dendl;
if (cache->mds->logger) cache->mds->logger->inc(l_mds_dir_split);
assert(replay || is_complete() || !is_auth());
list<frag_t> frags;
frag.split(bits, frags);
vector<CDir*> subfrags(1 << bits);
double fac = 1.0 / (double)(1 << bits); // for scaling load vecs
version_t rstat_version = inode->get_projected_inode()->rstat.version;
version_t dirstat_version = inode->get_projected_inode()->dirstat.version;
nest_info_t rstatdiff;
frag_info_t fragstatdiff;
if (fnode.accounted_rstat.version == rstat_version)
rstatdiff.add_delta(fnode.accounted_rstat, fnode.rstat);
if (fnode.accounted_fragstat.version == dirstat_version) {
bool touched_mtime;
fragstatdiff.add_delta(fnode.accounted_fragstat, fnode.fragstat, touched_mtime);
}
dout(10) << " rstatdiff " << rstatdiff << " fragstatdiff " << fragstatdiff << dendl;
prepare_old_fragment(replay);
// create subfrag dirs
int n = 0;
for (list<frag_t>::iterator p = frags.begin(); p != frags.end(); ++p) {
CDir *f = new CDir(inode, *p, cache, is_auth());
f->state_set(state & (MASK_STATE_FRAGMENT_KEPT | STATE_COMPLETE));
f->replica_map = replica_map;
f->dir_auth = dir_auth;
f->init_fragment_pins();
f->set_version(get_version());
f->pop_me = pop_me;
f->pop_me.scale(fac);
// FIXME; this is an approximation
f->pop_nested = pop_nested;
f->pop_nested.scale(fac);
f->pop_auth_subtree = pop_auth_subtree;
f->pop_auth_subtree.scale(fac);
f->pop_auth_subtree_nested = pop_auth_subtree_nested;
f->pop_auth_subtree_nested.scale(fac);
dout(10) << " subfrag " << *p << " " << *f << dendl;
subfrags[n++] = f;
subs.push_back(f);
inode->add_dirfrag(f);
f->set_dir_auth(get_dir_auth());
f->prepare_new_fragment(replay);
}
// repartition dentries
while (!items.empty()) {
CDir::map_t::iterator p = items.begin();
CDentry *dn = p->second;
frag_t subfrag = inode->pick_dirfrag(dn->name);
int n = (subfrag.value() & (subfrag.mask() ^ frag.mask())) >> subfrag.mask_shift();
dout(15) << " subfrag " << subfrag << " n=" << n << " for " << p->first << dendl;
CDir *f = subfrags[n];
f->steal_dentry(dn);
}
// FIXME: handle dirty old rstat
// fix up new frag fragstats
for (int i=0; i<n; i++) {
CDir *f = subfrags[i];
f->fnode.rstat.version = rstat_version;
f->fnode.accounted_rstat = f->fnode.rstat;
f->fnode.fragstat.version = dirstat_version;
f->fnode.accounted_fragstat = f->fnode.fragstat;
dout(10) << " rstat " << f->fnode.rstat << " fragstat " << f->fnode.fragstat
<< " on " << *f << dendl;