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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) 2016 Red Hat
*
* 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 "ExtentCache.h"
using std::ostream;
using ceph::bufferlist;
void ExtentCache::extent::_link_pin_state(pin_state &pin_state)
{
ceph_assert(parent_extent_set);
ceph_assert(!parent_pin_state);
parent_pin_state = &pin_state;
pin_state.pin_list.push_back(*this);
}
void ExtentCache::extent::_unlink_pin_state()
{
ceph_assert(parent_extent_set);
ceph_assert(parent_pin_state);
auto liter = pin_state::list::s_iterator_to(*this);
parent_pin_state->pin_list.erase(liter);
parent_pin_state = nullptr;
}
void ExtentCache::extent::unlink()
{
ceph_assert(parent_extent_set);
ceph_assert(parent_pin_state);
_unlink_pin_state();
// remove from extent set
{
auto siter = object_extent_set::set::s_iterator_to(*this);
auto &set = object_extent_set::set::container_from_iterator(siter);
ceph_assert(&set == &(parent_extent_set->extent_set));
set.erase(siter);
}
parent_extent_set = nullptr;
ceph_assert(!parent_pin_state);
}
void ExtentCache::extent::link(
object_extent_set &extent_set,
pin_state &pin_state)
{
ceph_assert(!parent_extent_set);
parent_extent_set = &extent_set;
extent_set.extent_set.insert(*this);
_link_pin_state(pin_state);
}
void ExtentCache::extent::move(
pin_state &to)
{
_unlink_pin_state();
_link_pin_state(to);
}
void ExtentCache::remove_and_destroy_if_empty(object_extent_set &eset)
{
if (eset.extent_set.empty()) {
auto siter = cache_set::s_iterator_to(eset);
auto &set = cache_set::container_from_iterator(siter);
ceph_assert(&set == &per_object_caches);
// per_object_caches owns eset
per_object_caches.erase(eset);
delete &eset;
}
}
ExtentCache::object_extent_set &ExtentCache::get_or_create(
const hobject_t &oid)
{
cache_set::insert_commit_data data;
auto p = per_object_caches.insert_check(oid, Cmp(), data);
if (p.second) {
auto *eset = new object_extent_set(oid);
per_object_caches.insert_commit(*eset, data);
return *eset;
} else {
return *(p.first);
}
}
ExtentCache::object_extent_set *ExtentCache::get_if_exists(
const hobject_t &oid)
{
cache_set::insert_commit_data data;
auto p = per_object_caches.insert_check(oid, Cmp(), data);
if (p.second) {
return nullptr;
} else {
return &*(p.first);
}
}
std::pair<
ExtentCache::object_extent_set::set::iterator,
ExtentCache::object_extent_set::set::iterator
> ExtentCache::object_extent_set::get_containing_range(
uint64_t off, uint64_t len)
{
// fst is first iterator with end after off (may be end)
auto fst = extent_set.upper_bound(off, uint_cmp());
if (fst != extent_set.begin())
--fst;
if (fst != extent_set.end() && off >= (fst->offset + fst->get_length()))
++fst;
// lst is first iterator with start >= off + len (may be end)
auto lst = extent_set.lower_bound(off + len, uint_cmp());
return std::make_pair(fst, lst);
}
extent_set ExtentCache::reserve_extents_for_rmw(
const hobject_t &oid,
write_pin &pin,
const extent_set &to_write,
const extent_set &to_read)
{
if (to_write.empty() && to_read.empty()) {
return extent_set();
}
extent_set must_read;
auto &eset = get_or_create(oid);
extent_set missing;
for (auto &&res: to_write) {
eset.traverse_update(
pin,
res.first,
res.second,
[&](uint64_t off, uint64_t len,
extent *ext, object_extent_set::update_action *action) {
action->action = object_extent_set::update_action::UPDATE_PIN;
if (!ext) {
missing.insert(off, len);
}
});
}
must_read.intersection_of(
to_read,
missing);
return must_read;
}
extent_map ExtentCache::get_remaining_extents_for_rmw(
const hobject_t &oid,
write_pin &pin,
const extent_set &to_get)
{
if (to_get.empty()) {
return extent_map();
}
extent_map ret;
auto &eset = get_or_create(oid);
for (auto &&res: to_get) {
bufferlist bl;
uint64_t cur = res.first;
eset.traverse_update(
pin,
res.first,
res.second,
[&](uint64_t off, uint64_t len,
extent *ext, object_extent_set::update_action *action) {
ceph_assert(off == cur);
cur = off + len;
action->action = object_extent_set::update_action::NONE;
ceph_assert(ext && ext->bl && ext->pinned_by_write());
bl.substr_of(
*(ext->bl),
off - ext->offset,
len);
ret.insert(off, len, bl);
});
}
return ret;
}
void ExtentCache::present_rmw_update(
const hobject_t &oid,
write_pin &pin,
const extent_map &extents)
{
if (extents.empty()) {
return;
}
auto &eset = get_or_create(oid);
for (auto &&res: extents) {
eset.traverse_update(
pin,
res.get_off(),
res.get_len(),
[&](uint64_t off, uint64_t len,
extent *ext, object_extent_set::update_action *action) {
action->action = object_extent_set::update_action::NONE;
ceph_assert(ext && ext->pinned_by_write());
action->bl = bufferlist();
action->bl->substr_of(
res.get_val(),
off - res.get_off(),
len);
});
}
}
ostream &ExtentCache::print(ostream &out) const
{
out << "ExtentCache(" << std::endl;
for (auto esiter = per_object_caches.begin();
esiter != per_object_caches.end();
++esiter) {
out << " Extents(" << esiter->oid << ")[" << std::endl;
for (auto exiter = esiter->extent_set.begin();
exiter != esiter->extent_set.end();
++exiter) {
out << " Extent(" << exiter->offset
<< "~" << exiter->get_length()
<< ":" << exiter->pin_tid()
<< ")" << std::endl;
}
}
return out << ")" << std::endl;
}
ostream &operator<<(ostream &lhs, const ExtentCache &cache)
{
return cache.print(lhs);
}
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