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fix coredump caused by fd_manager_lock locking

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root 2019-07-13 12:03:27 +08:00
parent 50d13255e4
commit 4e351c59e3
1 changed files with 44 additions and 45 deletions
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89
src/fdcache.cpp
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@ -2113,59 +2113,58 @@ FdEntity* FdManager::Open(const char* path, headers_t* pmeta, off_t size, time_t
}
bool close = false;
FdEntity* ent;
{
AutoLock auto_lock(&FdManager::fd_manager_lock);
// search in mapping by key(path)
fdent_map_t::iterator iter = fent.find(string(path));
AutoLock auto_lock(&FdManager::fd_manager_lock);
if(fent.end() == iter && !force_tmpfile && !FdManager::IsCacheDir()){
// If the cache directory is not specified, s3fs opens a temporary file
// when the file is opened.
// Then if it could not find a entity in map for the file, s3fs should
// search a entity in all which opened the temporary file.
//
for(iter = fent.begin(); iter != fent.end(); ++iter){
if((*iter).second && (*iter).second->IsOpen() && 0 == strcmp((*iter).second->GetPath(), path)){
break; // found opened fd in mapping
}
// search in mapping by key(path)
fdent_map_t::iterator iter = fent.find(string(path));
if(fent.end() == iter && !force_tmpfile && !FdManager::IsCacheDir()){
// If the cache directory is not specified, s3fs opens a temporary file
// when the file is opened.
// Then if it could not find a entity in map for the file, s3fs should
// search a entity in all which opened the temporary file.
//
for(iter = fent.begin(); iter != fent.end(); ++iter){
if((*iter).second && (*iter).second->IsOpen() && 0 == strcmp((*iter).second->GetPath(), path)){
break; // found opened fd in mapping
}
}
}
if(fent.end() != iter){
// found
ent = (*iter).second;
ent->Dup();
close = true;
if(fent.end() != iter){
// found
ent = (*iter).second;
ent->Dup();
close = true;
}else if(is_create){
// not found
string cache_path;
if(!force_tmpfile && !FdManager::MakeCachePath(path, cache_path, true)){
S3FS_PRN_ERR("failed to make cache path for object(%s).", path);
return NULL;
}
// make new obj
ent = new FdEntity(path, cache_path.c_str());
if(!cache_path.empty()){
// using cache
fent[string(path)] = ent;
}else{
// not using cache, so the key of fdentity is set not really existing path.
// (but not strictly unexisting path.)
//
// [NOTE]
// The reason why this process here, please look at the definition of the
// comments of NOCACHE_PATH_PREFIX_FORM symbol.
//
string tmppath;
FdManager::MakeRandomTempPath(path, tmppath);
fent[tmppath] = ent;
}
}else{
}else if(is_create){
// not found
string cache_path;
if(!force_tmpfile && !FdManager::MakeCachePath(path, cache_path, true)){
S3FS_PRN_ERR("failed to make cache path for object(%s).", path);
return NULL;
}
// make new obj
ent = new FdEntity(path, cache_path.c_str());
if(!cache_path.empty()){
// using cache
fent[string(path)] = ent;
}else{
// not using cache, so the key of fdentity is set not really existing path.
// (but not strictly unexisting path.)
//
// [NOTE]
// The reason why this process here, please look at the definition of the
// comments of NOCACHE_PATH_PREFIX_FORM symbol.
//
string tmppath;
FdManager::MakeRandomTempPath(path, tmppath);
fent[tmppath] = ent;
}
}else{
return NULL;
}
// open