mirror of
https://github.com/s3fs-fuse/s3fs-fuse.git
synced 2024-06-01 00:20:49 +00:00
Fixed mount point stat flag to be thread safe
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parent
7bf4ca1837
commit
1fc0e52dc3
84
src/s3fs.cpp
84
src/s3fs.cpp
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@ -73,7 +73,6 @@ static gid_t mp_gid = 0; // group of mount point(only not speci
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static mode_t mp_mode = 0; // mode of mount point
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static mode_t mp_umask = 0; // umask for mount point
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static bool is_mp_umask = false;// default does not set.
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static bool has_mp_stat = false;// whether the stat information file for mount point exists
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static std::string mountpoint;
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static S3fsCred* ps3fscred = NULL; // using only in this file
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static std::string mimetype_file;
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@ -189,6 +188,74 @@ static int s3fs_getxattr(const char* path, const char* name, char* value, size_t
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static int s3fs_listxattr(const char* path, char* list, size_t size);
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static int s3fs_removexattr(const char* path, const char* name);
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//-------------------------------------------------------------------
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// Classes
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//-------------------------------------------------------------------
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//
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// A flag class indicating whether the mount point has a stat
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//
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// [NOTE]
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// The flag is accessed from child threads, so This class is used for exclusive control of flags.
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// This class will be reviewed when we organize the code in the future.
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//
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class MpStatFlag
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{
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private:
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mutable pthread_mutex_t flag_lock;
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bool is_lock_init;
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bool has_mp_stat;
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public:
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MpStatFlag();
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~MpStatFlag();
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bool Get();
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bool Set(bool flag);
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};
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MpStatFlag::MpStatFlag() : is_lock_init(false), has_mp_stat(false)
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{
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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#if S3FS_PTHREAD_ERRORCHECK
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
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#endif
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int result;
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if(0 != (result = pthread_mutex_init(&flag_lock, &attr))){
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S3FS_PRN_CRIT("failed to init flag_lock: %d", result);
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abort();
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}
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is_lock_init = true;
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}
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MpStatFlag::~MpStatFlag()
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{
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if(is_lock_init){
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int result;
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if(0 != (result = pthread_mutex_destroy(&flag_lock))){
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S3FS_PRN_CRIT("failed to destroy flag_lock: %d", result);
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abort();
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}
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is_lock_init = false;
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}
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}
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bool MpStatFlag::Get()
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{
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AutoLock auto_lock(&flag_lock);
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return has_mp_stat;
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}
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bool MpStatFlag::Set(bool flag)
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{
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AutoLock auto_lock(&flag_lock);
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bool old = has_mp_stat;
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has_mp_stat = flag;
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return old;
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}
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// whether the stat information file for mount point exists
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static MpStatFlag* pHasMpStat = NULL;
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//-------------------------------------------------------------------
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// Functions
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//-------------------------------------------------------------------
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@ -205,9 +272,9 @@ static bool IS_RMTYPEDIR(dirtype type)
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static bool IS_CREATE_MP_STAT(const char* path)
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{
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// [NOTE]
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// "has_mp_stat" is set in get_object_attribute()
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// pHasMpStat->Get() is set in get_object_attribute()
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//
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return (path && 0 == strcmp(path, "/") && !has_mp_stat);
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return (path && 0 == strcmp(path, "/") && !pHasMpStat->Get());
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}
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static bool is_special_name_folder_object(const char* path)
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@ -521,7 +588,7 @@ static int get_object_attribute(const char* path, struct stat* pstbuf, headers_t
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// set headers for mount point from default stat
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if(is_mountpoint){
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if(0 != result || pheader->empty()){
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has_mp_stat = false;
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pHasMpStat->Set(false);
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// [NOTE]
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// If mount point and no stat information file, create header
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@ -537,7 +604,7 @@ static int get_object_attribute(const char* path, struct stat* pstbuf, headers_t
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result = 0;
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}else{
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has_mp_stat = true;
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pHasMpStat->Set(true);
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}
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}
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@ -3417,7 +3484,7 @@ static int remote_mountpath_exists(const char* path, bool compat_dir)
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// as a mount point, you can avoid the error by starting with "compat_dir"
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// specified.
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//
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if(!has_mp_stat && !compat_dir){
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if(!compat_dir && !pHasMpStat->Get()){
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return -ENOENT;
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}
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return 0;
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@ -5617,6 +5684,10 @@ int main(int argc, char* argv[])
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exit(EXIT_FAILURE);
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}
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// set mp stat flag object
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//
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pHasMpStat = new MpStatFlag();
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s3fs_oper.getattr = s3fs_getattr;
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s3fs_oper.readlink = s3fs_readlink;
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s3fs_oper.mknod = s3fs_mknod;
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@ -5676,6 +5747,7 @@ int main(int argc, char* argv[])
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destroy_parser_xml_lock();
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destroy_basename_lock();
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delete ps3fscred;
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delete pHasMpStat;
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// cleanup xml2
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xmlCleanupParser();
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