mirror of
https://github.com/s3fs-fuse/s3fs-fuse.git
synced 2024-11-15 08:54:07 +00:00
135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
/*
|
|
* s3fs - FUSE-based file system backed by Amazon S3
|
|
*
|
|
* Copyright(C) 2007 Takeshi Nakatani <ggtakec.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <cstdio>
|
|
#include <cstdlib>
|
|
#include <algorithm>
|
|
|
|
#include "common.h"
|
|
#include "s3fs.h"
|
|
#include "fdcache_pseudofd.h"
|
|
#include "autolock.h"
|
|
|
|
//------------------------------------------------
|
|
// Symbols
|
|
//------------------------------------------------
|
|
// [NOTE]
|
|
// The minimum pseudo fd value starts 2.
|
|
// This is to avoid mistakes for 0(stdout) and 1(stderr), which are usually used.
|
|
//
|
|
#define MIN_PSEUDOFD_NUMBER 2
|
|
|
|
//------------------------------------------------
|
|
// PseudoFdManager class methods
|
|
//------------------------------------------------
|
|
PseudoFdManager& PseudoFdManager::GetManager()
|
|
{
|
|
static PseudoFdManager singleton;
|
|
return singleton;
|
|
}
|
|
|
|
int PseudoFdManager::Get()
|
|
{
|
|
return (PseudoFdManager::GetManager()).CreatePseudoFd();
|
|
}
|
|
|
|
bool PseudoFdManager::Release(int fd)
|
|
{
|
|
return (PseudoFdManager::GetManager()).ReleasePseudoFd(fd);
|
|
}
|
|
|
|
//------------------------------------------------
|
|
// PseudoFdManager methods
|
|
//------------------------------------------------
|
|
PseudoFdManager::PseudoFdManager() : is_lock_init(false)
|
|
{
|
|
pthread_mutexattr_t attr;
|
|
pthread_mutexattr_init(&attr);
|
|
#if S3FS_PTHREAD_ERRORCHECK
|
|
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
|
|
#endif
|
|
int result;
|
|
if(0 != (result = pthread_mutex_init(&pseudofd_list_lock, &attr))){
|
|
S3FS_PRN_CRIT("failed to init pseudofd_list_lock: %d", result);
|
|
abort();
|
|
}
|
|
is_lock_init = true;
|
|
}
|
|
|
|
PseudoFdManager::~PseudoFdManager()
|
|
{
|
|
if(is_lock_init){
|
|
int result;
|
|
if(0 != (result = pthread_mutex_destroy(&pseudofd_list_lock))){
|
|
S3FS_PRN_CRIT("failed to destroy pseudofd_list_lock: %d", result);
|
|
abort();
|
|
}
|
|
is_lock_init = false;
|
|
}
|
|
}
|
|
|
|
int PseudoFdManager::GetUnusedMinPseudoFd() const
|
|
{
|
|
int min_fd = MIN_PSEUDOFD_NUMBER;
|
|
|
|
// Look for the first discontinuous value.
|
|
for(pseudofd_list_t::const_iterator iter = pseudofd_list.begin(); iter != pseudofd_list.end(); ++iter){
|
|
if(min_fd == (*iter)){
|
|
++min_fd;
|
|
}else if(min_fd < (*iter)){
|
|
break;
|
|
}
|
|
}
|
|
return min_fd;
|
|
}
|
|
|
|
int PseudoFdManager::CreatePseudoFd()
|
|
{
|
|
AutoLock auto_lock(&pseudofd_list_lock);
|
|
|
|
int new_fd = PseudoFdManager::GetUnusedMinPseudoFd();
|
|
pseudofd_list.push_back(new_fd);
|
|
std::sort(pseudofd_list.begin(), pseudofd_list.end());
|
|
|
|
return new_fd;
|
|
}
|
|
|
|
bool PseudoFdManager::ReleasePseudoFd(int fd)
|
|
{
|
|
AutoLock auto_lock(&pseudofd_list_lock);
|
|
|
|
for(pseudofd_list_t::iterator iter = pseudofd_list.begin(); iter != pseudofd_list.end(); ++iter){
|
|
if(fd == (*iter)){
|
|
pseudofd_list.erase(iter);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Local variables:
|
|
* tab-width: 4
|
|
* c-basic-offset: 4
|
|
* End:
|
|
* vim600: expandtab sw=4 ts=4 fdm=marker
|
|
* vim<600: expandtab sw=4 ts=4
|
|
*/
|