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https://github.com/s3fs-fuse/s3fs-fuse.git
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557 lines
14 KiB
C++
557 lines
14 KiB
C++
/*
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* s3fs - FUSE-based file system backed by Amazon S3
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*
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* Copyright 2007-2008 Randy Rizun <rrizun@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#ifndef HAVE_CLOCK_GETTIME
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#include <sys/time.h>
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#endif
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#include <unistd.h>
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#include <stdint.h>
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#include <pthread.h>
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#include <string.h>
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#include <assert.h>
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#include <syslog.h>
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#include <string>
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#include <map>
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#include <vector>
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#include <algorithm>
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#include <list>
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#include "cache.h"
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#include "s3fs.h"
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#include "s3fs_util.h"
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#include "string_util.h"
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using namespace std;
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//-------------------------------------------------------------------
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// Utility
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//-------------------------------------------------------------------
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#if defined(CLOCK_MONOTONIC_COARSE)
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#define CLOCK_MONOTONIC_COARSE 6
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#endif
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#ifndef HAVE_CLOCK_GETTIME
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static int clock_gettime(int clk_id, struct timespec* ts)
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{
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struct timeval now;
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if(0 != gettimeofday(&now, NULL)){
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return -1;
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}
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ts->tv_sec = now.tv_sec;
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ts->tv_nsec = now.tv_usec * 1000;
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return 0;
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}
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#endif
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inline void SetStatCacheTime(struct timespec& ts)
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{
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if(-1 == clock_gettime(CLOCK_MONOTONIC_COARSE, &ts)){
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ts.tv_sec = time(NULL);
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ts.tv_nsec = 0;
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}
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}
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inline void InitStatCacheTime(struct timespec& ts)
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{
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ts.tv_sec = 0;
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ts.tv_nsec = 0;
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}
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inline int CompareStatCacheTime(struct timespec& ts1, struct timespec& ts2)
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{
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// return -1: ts1 < ts2
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// 0: ts1 == ts2
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// 1: ts1 > ts2
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if(ts1.tv_sec < ts2.tv_sec){
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return -1;
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}else if(ts1.tv_sec > ts2.tv_sec){
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return 1;
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}else{
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if(ts1.tv_nsec < ts2.tv_nsec){
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return -1;
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}else if(ts1.tv_nsec > ts2.tv_nsec){
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return 1;
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}
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}
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return 0;
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}
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inline bool IsExpireStatCacheTime(const struct timespec& ts, const time_t& expire)
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{
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return ((ts.tv_sec + expire) < time(NULL));
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}
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//
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// For cache out
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//
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typedef std::vector<stat_cache_t::iterator> statiterlist_t;
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struct sort_statiterlist{
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// ascending order
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bool operator()(const stat_cache_t::iterator& src1, const stat_cache_t::iterator& src2) const
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{
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int result = CompareStatCacheTime(src1->second->cache_date, src2->second->cache_date);
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if(0 == result){
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if(src1->second->hit_count < src2->second->hit_count){
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result = -1;
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}
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}
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return (result < 0);
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}
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};
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//-------------------------------------------------------------------
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// Static
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//-------------------------------------------------------------------
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StatCache StatCache::singleton;
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pthread_mutex_t StatCache::stat_cache_lock;
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//-------------------------------------------------------------------
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// Constructor/Destructor
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//-------------------------------------------------------------------
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StatCache::StatCache() : IsExpireTime(false), ExpireTime(0), CacheSize(1000), IsCacheNoObject(false)
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{
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if(this == StatCache::getStatCacheData()){
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stat_cache.clear();
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pthread_mutex_init(&(StatCache::stat_cache_lock), NULL);
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}else{
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assert(false);
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}
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}
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StatCache::~StatCache()
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{
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if(this == StatCache::getStatCacheData()){
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Clear();
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pthread_mutex_destroy(&(StatCache::stat_cache_lock));
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}else{
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assert(false);
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}
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}
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//-------------------------------------------------------------------
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// Methods
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//-------------------------------------------------------------------
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unsigned long StatCache::GetCacheSize(void) const
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{
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return CacheSize;
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}
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unsigned long StatCache::SetCacheSize(unsigned long size)
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{
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unsigned long old = CacheSize;
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CacheSize = size;
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return old;
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}
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time_t StatCache::GetExpireTime(void) const
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{
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return (IsExpireTime ? ExpireTime : (-1));
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}
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time_t StatCache::SetExpireTime(time_t expire)
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{
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time_t old = ExpireTime;
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ExpireTime = expire;
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IsExpireTime = true;
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return old;
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}
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time_t StatCache::UnsetExpireTime(void)
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{
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time_t old = IsExpireTime ? ExpireTime : (-1);
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ExpireTime = 0;
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IsExpireTime = false;
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return old;
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}
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bool StatCache::SetCacheNoObject(bool flag)
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{
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bool old = IsCacheNoObject;
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IsCacheNoObject = flag;
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return old;
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}
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void StatCache::Clear(void)
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{
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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for(stat_cache_t::iterator iter = stat_cache.begin(); iter != stat_cache.end(); stat_cache.erase(iter++)){
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if((*iter).second){
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delete (*iter).second;
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}
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}
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S3FS_MALLOCTRIM(0);
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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}
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bool StatCache::GetStat(string& key, struct stat* pst, headers_t* meta, bool overcheck, const char* petag, bool* pisforce)
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{
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bool is_delete_cache = false;
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string strpath = key;
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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stat_cache_t::iterator iter = stat_cache.end();
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if(overcheck && '/' != strpath[strpath.length() - 1]){
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strpath += "/";
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iter = stat_cache.find(strpath.c_str());
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}
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if(iter == stat_cache.end()){
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strpath = key;
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iter = stat_cache.find(strpath.c_str());
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}
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if(iter != stat_cache.end() && (*iter).second){
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stat_cache_entry* ent = (*iter).second;
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if(!IsExpireTime || !IsExpireStatCacheTime(ent->cache_date, ExpireTime)){
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if(ent->noobjcache){
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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if(!IsCacheNoObject){
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// need to delete this cache.
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DelStat(strpath);
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}else{
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// noobjcache = true means no object.
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}
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return false;
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}
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// hit without checking etag
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if(petag){
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string stretag = ent->meta["ETag"];
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if('\0' != petag[0] && 0 != strcmp(petag, stretag.c_str())){
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is_delete_cache = true;
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}
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}
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if(is_delete_cache){
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// not hit by different ETag
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S3FS_PRN_DBG("stat cache not hit by ETag[path=%s][time=%jd.%09ld][hit count=%lu][ETag(%s)!=(%s)]",
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strpath.c_str(), (intmax_t)(ent->cache_date.tv_sec), ent->cache_date.tv_nsec, ent->hit_count, petag ? petag : "null", ent->meta["ETag"].c_str());
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}else{
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// hit
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S3FS_PRN_DBG("stat cache hit [path=%s][time=%jd.%09ld][hit count=%lu]",
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strpath.c_str(), (intmax_t)(ent->cache_date.tv_sec), ent->cache_date.tv_nsec, ent->hit_count);
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if(pst!= NULL){
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*pst= ent->stbuf;
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}
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if(meta != NULL){
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*meta = ent->meta;
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}
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if(pisforce != NULL){
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(*pisforce) = ent->isforce;
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}
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ent->hit_count++;
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SetStatCacheTime(ent->cache_date);
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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}else{
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// timeout
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is_delete_cache = true;
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}
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}
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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if(is_delete_cache){
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DelStat(strpath);
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}
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return false;
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}
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bool StatCache::IsNoObjectCache(string& key, bool overcheck)
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{
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bool is_delete_cache = false;
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string strpath = key;
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if(!IsCacheNoObject){
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return false;
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}
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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stat_cache_t::iterator iter = stat_cache.end();
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if(overcheck && '/' != strpath[strpath.length() - 1]){
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strpath += "/";
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iter = stat_cache.find(strpath.c_str());
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}
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if(iter == stat_cache.end()){
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strpath = key;
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iter = stat_cache.find(strpath.c_str());
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}
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if(iter != stat_cache.end() && (*iter).second) {
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if(!IsExpireTime || !IsExpireStatCacheTime((*iter).second->cache_date, ExpireTime)){
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if((*iter).second->noobjcache){
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// noobjcache = true means no object.
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SetStatCacheTime((*iter).second->cache_date);
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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}else{
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// timeout
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is_delete_cache = true;
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}
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}
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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if(is_delete_cache){
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DelStat(strpath);
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}
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return false;
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}
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bool StatCache::AddStat(std::string& key, headers_t& meta, bool forcedir)
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{
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if(CacheSize< 1){
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return true;
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}
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S3FS_PRN_INFO3("add stat cache entry[path=%s]", key.c_str());
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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bool found = stat_cache.end() != stat_cache.find(key);
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bool do_truncate = stat_cache.size() > CacheSize;
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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if(found){
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DelStat(key.c_str());
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}else{
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if(do_truncate){
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if(!TruncateCache()){
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return false;
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}
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}
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}
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// make new
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stat_cache_entry* ent = new stat_cache_entry();
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if(!convert_header_to_stat(key.c_str(), meta, &(ent->stbuf), forcedir)){
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delete ent;
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return false;
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}
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ent->hit_count = 0;
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ent->isforce = forcedir;
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ent->noobjcache = false;
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ent->meta.clear();
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SetStatCacheTime(ent->cache_date); // Set time.
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//copy only some keys
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for(headers_t::iterator iter = meta.begin(); iter != meta.end(); ++iter){
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string tag = lower(iter->first);
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string value = iter->second;
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if(tag == "content-type"){
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ent->meta[iter->first] = value;
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}else if(tag == "content-length"){
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ent->meta[iter->first] = value;
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}else if(tag == "etag"){
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ent->meta[iter->first] = value;
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}else if(tag == "last-modified"){
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ent->meta[iter->first] = value;
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}else if(tag.substr(0, 5) == "x-amz"){
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ent->meta[tag] = value; // key is lower case for "x-amz"
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}
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}
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// add
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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stat_cache[key] = ent;
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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bool StatCache::AddNoObjectCache(string& key)
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{
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if(!IsCacheNoObject){
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return true; // pretend successful
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}
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if(CacheSize < 1){
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return true;
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}
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S3FS_PRN_INFO3("add no object cache entry[path=%s]", key.c_str());
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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bool found = stat_cache.end() != stat_cache.find(key);
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bool do_truncate = stat_cache.size() > CacheSize;
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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if(found){
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DelStat(key.c_str());
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}else{
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if(do_truncate){
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if(!TruncateCache()){
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return false;
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}
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}
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}
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// make new
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stat_cache_entry* ent = new stat_cache_entry();
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memset(&(ent->stbuf), 0, sizeof(struct stat));
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ent->hit_count = 0;
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ent->isforce = false;
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ent->noobjcache = true;
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ent->meta.clear();
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SetStatCacheTime(ent->cache_date); // Set time.
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// add
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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stat_cache[key] = ent;
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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bool StatCache::TruncateCache(void)
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{
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if(stat_cache.empty()){
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return true;
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}
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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// 1) erase over expire time
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if(IsExpireTime){
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for(stat_cache_t::iterator iter = stat_cache.begin(); iter != stat_cache.end(); ){
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stat_cache_entry* entry = iter->second;
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if(!entry || IsExpireStatCacheTime(entry->cache_date, ExpireTime)){
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stat_cache.erase(iter++);
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}else{
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++iter;
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}
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}
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}
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// 2) check stat cache count
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if(stat_cache.size() < CacheSize){
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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// 3) erase from the old cache in order
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size_t erase_count= stat_cache.size() - CacheSize + 1;
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statiterlist_t erase_iters;
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for(stat_cache_t::iterator iter = stat_cache.begin(); iter != stat_cache.end(); ++iter){
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erase_iters.push_back(iter);
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sort(erase_iters.begin(), erase_iters.end(), sort_statiterlist());
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if(erase_count < erase_iters.size()){
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erase_iters.pop_back();
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}
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}
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for(statiterlist_t::iterator iiter = erase_iters.begin(); iiter != erase_iters.end(); ++iiter){
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stat_cache_t::iterator siter = *iiter;
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S3FS_PRN_DBG("truncate stat cache[path=%s]", siter->first.c_str());
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stat_cache.erase(siter);
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}
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S3FS_MALLOCTRIM(0);
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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bool StatCache::DelStat(const char* key)
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{
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if(!key){
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return false;
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}
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S3FS_PRN_INFO3("delete stat cache entry[path=%s]", key);
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pthread_mutex_lock(&StatCache::stat_cache_lock);
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stat_cache_t::iterator iter;
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if(stat_cache.end() != (iter = stat_cache.find(string(key)))){
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if((*iter).second){
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delete (*iter).second;
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}
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stat_cache.erase(iter);
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}
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if(0 < strlen(key) && 0 != strcmp(key, "/")){
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string strpath = key;
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if('/' == strpath[strpath.length() - 1]){
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// If there is "path" cache, delete it.
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strpath = strpath.substr(0, strpath.length() - 1);
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}else{
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// If there is "path/" cache, delete it.
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strpath += "/";
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}
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if(stat_cache.end() != (iter = stat_cache.find(strpath.c_str()))){
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if((*iter).second){
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delete (*iter).second;
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}
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stat_cache.erase(iter);
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}
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}
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S3FS_MALLOCTRIM(0);
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pthread_mutex_unlock(&StatCache::stat_cache_lock);
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return true;
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}
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//-------------------------------------------------------------------
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// Functions
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//-------------------------------------------------------------------
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bool convert_header_to_stat(const char* path, headers_t& meta, struct stat* pst, bool forcedir)
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{
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if(!path || !pst){
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return false;
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}
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memset(pst, 0, sizeof(struct stat));
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pst->st_nlink = 1; // see fuse FAQ
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// mode
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pst->st_mode = get_mode(meta, path, true, forcedir);
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// blocks
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if(S_ISREG(pst->st_mode)){
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pst->st_blocks = get_blocks(pst->st_size);
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}
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pst->st_blksize = 4096;
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// mtime
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pst->st_mtime = get_mtime(meta);
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|
|
// size
|
|
pst->st_size = get_size(meta);
|
|
|
|
// uid/gid
|
|
pst->st_uid = get_uid(meta);
|
|
pst->st_gid = get_gid(meta);
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* End:
|
|
* vim600: noet sw=4 ts=4 fdm=marker
|
|
* vim<600: noet sw=4 ts=4
|
|
*/
|