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Fix data races caused by incorrect locking (#1668)

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Found via Threadsanitizer.  Fixes #1471.
This commit is contained in:
Andrew Gaul 2021-05-29 00:11:55 +09:00 committed by GitHub
parent 9bf525ee7a
commit 84174c560d
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 18 additions and 18 deletions
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2
src/fdcache.cpp
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@ -512,7 +512,7 @@ FdEntity* FdManager::Open(const char* path, headers_t* pmeta, off_t size, time_t
}
// open
if(0 != ent->Open(pmeta, size, time, no_fd_lock_wait)){
if(0 != ent->Open(pmeta, size, time, no_fd_lock_wait ? AutoLock::NO_WAIT : AutoLock::NONE)){
if(close){
ent->Close();
}

25
src/fdcache_entity.cpp
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@ -310,9 +310,9 @@ int FdEntity::OpenMirrorFile()
return mirrorfd;
}
int FdEntity::Open(headers_t* pmeta, off_t size, time_t time, bool no_fd_lock_wait)
int FdEntity::Open(headers_t* pmeta, off_t size, time_t time, AutoLock::Type type)
{
AutoLock auto_lock(&fdent_lock, no_fd_lock_wait ? AutoLock::NO_WAIT : AutoLock::NONE);
AutoLock auto_lock(&fdent_lock, type);
S3FS_PRN_DBG("[path=%s][fd=%d][size=%lld][time=%lld]", path.c_str(), fd, static_cast<long long>(size), static_cast<long long>(time));
@ -554,7 +554,7 @@ bool FdEntity::OpenAndLoadAll(headers_t* pmeta, off_t* size, bool force_load)
S3FS_PRN_INFO3("[path=%s][fd=%d]", path.c_str(), fd);
if(-1 == fd){
if(0 != Open(pmeta)){
if(0 != Open(pmeta, /*size=*/ -1, /*time=*/ -1, AutoLock::ALREADY_LOCKED)){
return false;
}
}
@ -1178,7 +1178,8 @@ int FdEntity::NoCacheCompleteMultipartPost()
return 0;
}
off_t FdEntity::BytesModified() const {
off_t FdEntity::BytesModified() {
AutoLock auto_lock(&fdent_data_lock);
return pagelist.BytesModified();
}
@ -1186,20 +1187,16 @@ int FdEntity::RowFlush(const char* tpath, bool force_sync)
{
int result = 0;
std::string tmppath;
headers_t tmporgmeta;
{
AutoLock auto_lock(&fdent_lock);
tmppath = path;
tmporgmeta = orgmeta;
}
std::string tmppath = path;
headers_t tmporgmeta = orgmeta;
S3FS_PRN_INFO3("[tpath=%s][path=%s][fd=%d]", SAFESTRPTR(tpath), tmppath.c_str(), fd);
if(-1 == fd){
return -EBADF;
}
AutoLock auto_lock(&fdent_data_lock);
AutoLock auto_lock2(&fdent_data_lock);
if(!force_sync && !pagelist.IsModified()){
// nothing to update.
@ -1394,7 +1391,8 @@ ssize_t FdEntity::Read(char* bytes, off_t start, size_t size, bool force_load)
if(-1 == fd){
return -EBADF;
}
AutoLock auto_lock(&fdent_data_lock);
AutoLock auto_lock(&fdent_lock);
AutoLock auto_lock2(&fdent_data_lock);
if(force_load){
pagelist.SetPageLoadedStatus(start, size, PageList::PAGE_NOT_LOAD_MODIFIED);
@ -1458,7 +1456,8 @@ ssize_t FdEntity::Write(const char* bytes, off_t start, size_t size)
if(FdManager::IsCacheDir() && !FdManager::IsSafeDiskSpace(NULL, size)){
FdManager::get()->CleanupCacheDir();
}
AutoLock auto_lock(&fdent_data_lock);
AutoLock auto_lock(&fdent_lock);
AutoLock auto_lock2(&fdent_data_lock);
// check file size
if(pagelist.Size() < start){

5
src/fdcache_entity.h
View File

@ -21,6 +21,7 @@
#ifndef S3FS_FDCACHE_ENTITY_H_
#define S3FS_FDCACHE_ENTITY_H_
#include "autolock.h"
#include "fdcache_page.h"
#include "metaheader.h"
@ -74,7 +75,7 @@ class FdEntity
void Close();
bool IsOpen() const { return (-1 != fd); }
int Open(headers_t* pmeta = NULL, off_t size = -1, time_t time = -1, bool no_fd_lock_wait = false);
int Open(headers_t* pmeta, off_t size, time_t time, AutoLock::Type type);
bool OpenAndLoadAll(headers_t* pmeta = NULL, off_t* size = NULL, bool force_load = false);
int Dup(bool lock_already_held = false);
int GetRefCnt() const { return refcnt; } // [NOTE] Use only debugging
@ -109,7 +110,7 @@ class FdEntity
int NoCacheMultipartPost(int tgfd, off_t start, off_t size);
int NoCacheCompleteMultipartPost();
off_t BytesModified() const;
off_t BytesModified();
int RowFlush(const char* tpath, bool force_sync = false);
int Flush(bool force_sync = false) { return RowFlush(NULL, force_sync); }

2
src/s3fs.cpp
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@ -2292,7 +2292,7 @@ static int s3fs_open(const char* _path, struct fuse_file_info* fi)
if (needs_flush){
time_t now = time(NULL);
struct timespec ts = {now, 0};
ent->SetMCtime(ts, ts, true);
ent->SetMCtime(ts, ts);
if(0 != (result = ent->RowFlush(path, true))){
S3FS_PRN_ERR("could not upload file(%s): result=%d", path, result);
StatCache::getStatCacheData()->DelStat(path);