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Fixed data race about fuse_fill_dir_t function and data pointer

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This commit is contained in:
Takeshi Nakatani 2023-07-13 12:30:29 +00:00 committed by Andrew Gaul
parent 537384e9b5
commit d0a944fcaa
1 changed files with 92 additions and 35 deletions
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127
src/s3fs.cpp
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@ -257,6 +257,88 @@ bool MpStatFlag::Set(bool flag)
// whether the stat information file for mount point exists
static MpStatFlag* pHasMpStat = NULL;
//
// A synchronous class that calls the fuse_fill_dir_t function that processes the readdir data
//
class SyncFiller
{
private:
mutable pthread_mutex_t filler_lock;
bool is_lock_init;
void* filler_buff;
fuse_fill_dir_t filler_func;
std::set<std::string> filled;
public:
explicit SyncFiller(void* buff = NULL, fuse_fill_dir_t filler = NULL);
~SyncFiller();
int Fill(const char *name, const struct stat *stbuf, off_t off);
int SufficiencyFill(const std::vector<std::string>& pathlist);
};
SyncFiller::SyncFiller(void* buff, fuse_fill_dir_t filler) : is_lock_init(false), filler_buff(buff), filler_func(filler)
{
if(!filler_buff || !filler_func){
S3FS_PRN_CRIT("Internal error: SyncFiller constructor parameter is critical value.");
abort();
}
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(&filler_lock, &attr))){
S3FS_PRN_CRIT("failed to init filler_lock: %d", result);
abort();
}
is_lock_init = true;
}
SyncFiller::~SyncFiller()
{
if(is_lock_init){
int result;
if(0 != (result = pthread_mutex_destroy(&filler_lock))){
S3FS_PRN_CRIT("failed to destroy filler_lock: %d", result);
abort();
}
is_lock_init = false;
}
}
//
// See. prototype fuse_fill_dir_t in fuse.h
//
int SyncFiller::Fill(const char *name, const struct stat *stbuf, off_t off)
{
AutoLock auto_lock(&filler_lock);
int result = 0;
if(filled.insert(std::string(name)).second){
result = filler_func(filler_buff, name, stbuf, off);
}
return result;
}
int SyncFiller::SufficiencyFill(const std::vector<std::string>& pathlist)
{
AutoLock auto_lock(&filler_lock);
int result = 0;
for(std::vector<std::string>::const_iterator it = pathlist.begin(); it != pathlist.end(); ++it) {
if(filled.insert(*it).second){
if(0 != filler_func(filler_buff, it->c_str(), 0, 0)){
result = 1;
}
}
}
return result;
}
//-------------------------------------------------------------------
// Functions
//-------------------------------------------------------------------
@ -3064,13 +3146,6 @@ static int s3fs_opendir(const char* _path, struct fuse_file_info* fi)
return result;
}
struct multi_head_callback_param
{
void* buf;
fuse_fill_dir_t filler;
std::set<std::string> *filled;
};
static bool multi_head_callback(S3fsCurl* s3fscurl, void* param)
{
if(!s3fscurl){
@ -3090,17 +3165,13 @@ static bool multi_head_callback(S3fsCurl* s3fscurl, void* param)
bpath = s3fs_wtf8_decode(bpath);
}
if(param){
struct multi_head_callback_param* pcbparam = reinterpret_cast<struct multi_head_callback_param*>(param);
SyncFiller* pcbparam = reinterpret_cast<SyncFiller*>(param);
struct stat st;
if(StatCache::getStatCacheData()->GetStat(saved_path, &st)){
if(pcbparam->filled->insert(bpath).second){
pcbparam->filler(pcbparam->buf, bpath.c_str(), &st, 0);
}
pcbparam->Fill(bpath.c_str(), &st, 0);
}else{
S3FS_PRN_INFO2("Could not find %s file in stat cache.", saved_path.c_str());
if(pcbparam->filled->insert(bpath).second){
pcbparam->filler(pcbparam->buf, bpath.c_str(), 0, 0);
}
pcbparam->Fill(bpath.c_str(), 0, 0);
}
}else{
S3FS_PRN_WARN("param(multi_head_callback_param*) is NULL, then can not call filler.");
@ -3176,7 +3247,6 @@ static int readdir_multi_head(const char* path, const S3ObjList& head, void* buf
S3fsMultiCurl curlmulti(S3fsCurl::GetMaxMultiRequest());
s3obj_list_t headlist;
int result = 0;
std::set<std::string> filled;
S3FS_PRN_INFO1("[path=%s][list=%zu]", path, headlist.size());
@ -3187,12 +3257,9 @@ static int readdir_multi_head(const char* path, const S3ObjList& head, void* buf
curlmulti.SetSuccessCallback(multi_head_callback);
curlmulti.SetRetryCallback(multi_head_retry_callback);
// Success Callback function parameter
struct multi_head_callback_param success_param;
success_param.buf = buf;
success_param.filler = filler;
success_param.filled = &filled;
curlmulti.SetSuccessCallbackParam(reinterpret_cast<void*>(&success_param));
// Success Callback function parameter(SyncFiller object)
SyncFiller syncfiller(buf, filler);
curlmulti.SetSuccessCallbackParam(reinterpret_cast<void*>(&syncfiller));
// Not found Callback function parameter
struct multi_head_notfound_callback_param notfound_param;
@ -3225,9 +3292,7 @@ static int readdir_multi_head(const char* path, const S3ObjList& head, void* buf
if(use_wtf8){
bpath = s3fs_wtf8_decode(bpath);
}
if(filled.insert(bpath).second){
filler(buf, bpath.c_str(), &st, 0);
}
syncfiller.Fill(bpath.c_str(), &st, 0);
continue;
}
@ -3266,11 +3331,7 @@ static int readdir_multi_head(const char* path, const S3ObjList& head, void* buf
// as a path, so search for objects under that path.(a case of no dir object)
//
if(!support_compat_dir){
for(std::vector<std::string>::const_iterator it = head.common_prefixes.begin(); it != head.common_prefixes.end(); ++it) {
if(filled.insert(*it).second){
filler(buf, it->c_str(), 0, 0);
}
}
syncfiller.SufficiencyFill(head.common_prefixes);
}
if(support_compat_dir && !notfound_param.notfound_list.empty()){ // [NOTE] not need to lock to access this here.
// dummy header
@ -3303,14 +3364,10 @@ static int readdir_multi_head(const char* path, const S3ObjList& head, void* buf
struct stat st;
if(StatCache::getStatCacheData()->GetStat(dirpath, &st)){
if(filled.insert(base_path).second){
filler(buf, base_path.c_str(), &st, 0);
}
syncfiller.Fill(base_path.c_str(), &st, 0);
}else{
S3FS_PRN_INFO2("Could not find %s directory(no dir object) in stat cache.", dirpath.c_str());
if(filled.insert(base_path).second){
filler(buf, base_path.c_str(), 0, 0);
}
syncfiller.Fill(base_path.c_str(), 0, 0);
}
}else{
S3FS_PRN_ERR("failed adding stat cache [path=%s], but dontinue...", dirpath.c_str());