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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 <tr1/memory>
#include <map>
#include "common/Mutex.h"
#include "common/Cond.h"
#include "common/config.h"
#include "common/debug.h"
#include "include/buffer.h"
#include "IndexManager.h"
#include "FlatIndex.h"
#include "HashIndex.h"
#include "FlatIndex.h"
#include "CollectionIndex.h"
int do_getxattr(const char *fn, const char *name, void *val, size_t size);
int do_setxattr(const char *fn, const char *name, const void *val, size_t size);
static int set_version(const char *path, uint32_t version) {
bufferlist bl;
::encode(version, bl);
return do_setxattr(path, "user.cephos.collection_version", bl.c_str(),
bl.length());
}
static int get_version(const char *path, uint32_t *version) {
bufferptr bp(PATH_MAX);
int r = do_getxattr(path, "user.cephos.collection_version",
bp.c_str(), bp.length());
if (r < 0) {
if (r != -ENOENT) {
*version = 0;
return 0;
} else {
return r;
}
}
bp.set_length(r);
bufferlist bl;
bl.push_back(bp);
bufferlist::iterator i = bl.begin();
::decode(*version, i);
return 0;
}
void IndexManager::put_index(coll_t c) {
Mutex::Locker l(lock);
assert(col_indices.count(c));
col_indices.erase(c);
cond.Signal();
}
int IndexManager::init_index(coll_t c, const char *path, uint32_t version) {
Mutex::Locker l(lock);
int r = set_version(path, version);
if (r < 0)
return r;
HashIndex index(path, g_conf->filestore_merge_threshold,
g_conf->filestore_split_multiple,
CollectionIndex::HASH_INDEX_TAG_2);
return index.init();
}
int IndexManager::build_index(coll_t c, const char *path, Index *index) {
int r;
if (g_conf->filestore_update_collections) {
// Need to check the collection generation
uint32_t version;
r = get_version(path, &version);
if (r < 0)
return r;
switch (version) {
case CollectionIndex::FLAT_INDEX_TAG: {
*index = Index(new FlatIndex(path),
RemoveOnDelete(c, this));
return 0;
}
case CollectionIndex::HASH_INDEX_TAG: // fall through
case CollectionIndex::HASH_INDEX_TAG_2: {
// Must be a HashIndex
*index = Index(new HashIndex(path, g_conf->filestore_merge_threshold,
g_conf->filestore_split_multiple, version),
RemoveOnDelete(c, this));
return 0;
}
default: assert(0);
}
} else {
// No need to check
*index = Index(new HashIndex(path, g_conf->filestore_merge_threshold,
g_conf->filestore_split_multiple,
CollectionIndex::HASH_INDEX_TAG_2),
RemoveOnDelete(c, this));
return 0;
}
}
int IndexManager::get_index(coll_t c, const char *path, Index *index) {
Mutex::Locker l(lock);
while (1) {
if (!col_indices.count(c)) {
int r = build_index(c, path, index);
if (r < 0)
return r;
(*index)->set_ref(*index);
col_indices[c] = (*index);
break;
} else {
cond.Wait(lock);
}
}
return 0;
}
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