Added check_cache_dir_exist option(refixed #347) - #538

doc/man/s3fs.1

@@ -10,10 +10,6 @@ S3FS \- FUSE-based file system backed by Amazon S3
 .SS unmounting
 .TP
 \fBumount mountpoint
-For root.
-.TP
-\fBfusermount -u mountpoint
-For unprivileged user.
 .SS utility mode ( remove interrupted multipart uploading objects )
 .TP
 \fBs3fs \-u bucket
@@ -68,6 +64,10 @@ number of times to retry a failed S3 transaction.
 \fB\-o\fR use_cache (default="" which means disabled)
 local folder to use for local file cache.
 .TP
+\fB\-o\fR check_cache_dir_exist (default is disable)
+If use_cache is set, check if the cache directory exists.
+If this option is not specified, it will be created at runtime when the cache directory does not exist.
+.TP
 \fB\-o\fR del_cache - delete local file cache
 delete local file cache when s3fs starts and exits.
 .TP

src/fdcache.cpp

@@ -1711,6 +1711,7 @@ FdManager       FdManager::singleton;
 pthread_mutex_t FdManager::fd_manager_lock;
 bool            FdManager::is_lock_init(false);
 string          FdManager::cache_dir("");
+bool            FdManager::check_cache_dir_exist(false);
 size_t          FdManager::free_disk_space = 0;
 
 //------------------------------------------------
@@ -1721,16 +1722,6 @@ bool FdManager::SetCacheDir(const char* dir)
   if(!dir || '\0' == dir[0]){
     cache_dir = "";
   }else{
-    // check the directory
-    struct stat st;
-    if(0 != stat(dir, &st)){
-      S3FS_PRN_ERR("could not access to cache directory(%s) by errno(%d).", cache_dir.c_str(), errno);
-      return false;
-    }
-    if(!S_ISDIR(st.st_mode)){
-      S3FS_PRN_ERR("the cache directory(%s) is not directory.", cache_dir.c_str());
-      return false;
-    }
     cache_dir = dir;
   }
   return true;
@@ -1838,6 +1829,34 @@ bool FdManager::MakeRandomTempPath(const char* path, string& tmppath)
   return true;
 }
 
+bool FdManager::SetCheckCacheDirExist(bool is_check)
+{
+  bool old = FdManager::check_cache_dir_exist;
+  FdManager::check_cache_dir_exist = is_check;
+  return old;
+}
+
+bool FdManager::CheckCacheDirExist(void)
+{
+  if(!FdManager::check_cache_dir_exist){
+    return true;
+  }
+  if(0 == FdManager::cache_dir.size()){
+    return true;
+  }
+  // check the directory
+  struct stat st;
+  if(0 != stat(cache_dir.c_str(), &st)){
+    S3FS_PRN_ERR("could not access to cache directory(%s) by errno(%d).", cache_dir.c_str(), errno);
+    return false;
+  }
+  if(!S_ISDIR(st.st_mode)){
+    S3FS_PRN_ERR("the cache directory(%s) is not directory.", cache_dir.c_str());
+    return false;
+  }
+  return true;
+}
+
 size_t FdManager::SetEnsureFreeDiskSpace(size_t size)
 {
   size_t old = FdManager::free_disk_space;
@@ -1863,6 +1882,10 @@ fsblkcnt_t FdManager::GetFreeDiskSpace(const char* path)
   string         ctoppath;
   if(0 < FdManager::cache_dir.size()){
     ctoppath = FdManager::cache_dir + "/";
+    ctoppath = get_exist_directory_path(ctoppath);	// existed directory
+    if(ctoppath != "/"){
+      ctoppath += "/";
+    }
   }else{
     ctoppath = TMPFILE_DIR_0PATH "/";
   }

src/fdcache.h

@@ -185,6 +185,7 @@ class FdManager
     static pthread_mutex_t fd_manager_lock;
     static bool            is_lock_init;
     static std::string     cache_dir;
+    static bool            check_cache_dir_exist;
     static size_t          free_disk_space; // limit free disk space
 
     fdent_map_t            fent;
@@ -207,6 +208,8 @@ class FdManager
     static bool MakeCachePath(const char* path, std::string& cache_path, bool is_create_dir = true, bool is_mirror_path = false);
     static bool CheckCacheTopDir(void);
     static bool MakeRandomTempPath(const char* path, std::string& tmppath);
+    static bool SetCheckCacheDirExist(bool is_check);
+    static bool CheckCacheDirExist(void);
 
     static size_t GetEnsureFreeDiskSpace(void) { return FdManager::free_disk_space; }
     static size_t SetEnsureFreeDiskSpace(size_t size);

src/s3fs.cpp

@@ -4351,10 +4351,11 @@ static int my_fuse_opt_proc(void* data, const char* arg, int key, struct fuse_ar
       return 0;
     }
     if(0 == STR2NCMP(arg, "use_cache=")){
-      if(!FdManager::SetCacheDir(strchr(arg, '=') + sizeof(char))){
-        S3FS_PRN_EXIT("cache directory(%s) is specified, but it does not exist or is not directory.", strchr(arg, '=') + sizeof(char));
-        return -1;
-      }
+      FdManager::SetCacheDir(strchr(arg, '=') + sizeof(char));
+      return 0;
+    }
+    if(0 == STR2NCMP(arg, "check_cache_dir_exist")){
+      FdManager::SetCheckCacheDirExist(true);
       return 0;
     }
     if(0 == strcmp(arg, "del_cache")){
@@ -4922,7 +4923,7 @@ int main(int argc, char* argv[])
   }
 
   // check cache dir permission
-  if(!FdManager::CheckCacheTopDir() || !CacheFileStat::CheckCacheFileStatTopDir()){
+  if(!FdManager::CheckCacheDirExist() || !FdManager::CheckCacheTopDir() || !CacheFileStat::CheckCacheFileStatTopDir()){
     S3FS_PRN_EXIT("could not allow cache directory permission, check permission of cache directories.");
     exit(EXIT_FAILURE);
   }

src/s3fs_util.cpp

@@ -582,6 +582,28 @@ int mkdirp(const string& path, mode_t mode)
   return 0;
 }
 
+// get existed directory path
+string get_exist_directory_path(const string& path)
+{
+  string       existed("/");    // "/" is existed.
+  string       base;
+  string       component;
+  stringstream ss(path);
+  while (getline(ss, component, '/')) {
+    if(base != "/"){
+      base += "/";
+    }
+    base += component;
+    struct stat st;
+    if(0 == stat(base.c_str(), &st) && S_ISDIR(st.st_mode)){
+      existed = base;
+    }else{
+      break;
+    }
+  }
+  return existed;
+}
+
 bool check_exist_dir_permission(const char* dirpath)
 {
   if(!dirpath || '\0' == dirpath[0]){
@@ -927,6 +949,11 @@ void show_help (void)
     "   use_cache (default=\"\" which means disabled)\n"
     "      - local folder to use for local file cache\n"
     "\n"
+    "   check_cache_dir_exist (default is disable)\n"
+    "      - if use_cache is set, check if the cache directory exists.\n"
+    "        if this option is not specified, it will be created at runtime\n"
+    "        when the cache directory does not exist.\n"
+    "\n"
     "   del_cache (delete local file cache)\n"
     "      - delete local file cache when s3fs starts and exits.\n"
     "\n"

src/s3fs_util.h

@@ -111,6 +111,7 @@ std::string mydirname(std::string path);
 std::string mybasename(const char* path);
 std::string mybasename(std::string path);
 int mkdirp(const std::string& path, mode_t mode);
+std::string get_exist_directory_path(const std::string& path);
 bool check_exist_dir_permission(const char* dirpath);
 bool delete_files_in_dir(const char* dir, bool is_remove_own);