include default_permissions in default arguments

closes #130

README.md

@@ -20,7 +20,7 @@ Why create **mergerfs** when those exist? **mhddfs** has not been updated in som
 
 ###options###
 
-* **defaults** is a shortcut for **auto_cache**. **big_writes**, **atomic_o_trunc**, **splice_read**, **splice_write**, and **splice_move** are in effect also enabled (by asking **FUSE** internally for such features) but if unavailable will be ignored. These options seem to provide the best performance.
+* **defaults** is a shortcut for FUSE's **atomic_o_trunc**, **auto_cache*, **big_writes**, **default_permissions**, **splice_move**, **splice_read**, and **splice_write**. These options seem to provide the best performance.
 * **minfreespace** (defaults to **4G**) is the minimum space value used for the **lfs**, **fwfs**, and **epmfs** policies. Understands 'K', 'M', and 'G' to represent kilobyte, megabyte, and gigabyte respectively.
 * All FUSE functions which have a category (see below) are option keys. The syntax being **func.<func>=<policy>**. Example: **func.getattr=newest**.
 * To set all function policies in a category use **category.<category>=<policy>**. Example: **category.create=mfs**.

src/getattr.cpp

@@ -45,14 +45,16 @@ static
 int
 _getattr_controlfile(struct stat &buf)
 {
-  time_t now = time(NULL);
+  static const uid_t  uid = ::getuid();
+  static const gid_t  gid = ::getgid();
+  static const time_t now = ::time(NULL);
 
   buf.st_dev     = 0;
   buf.st_ino     = 0;
   buf.st_mode    = (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH);
   buf.st_nlink   = 1;
-  buf.st_uid     = ::getuid();
-  buf.st_gid     = ::getgid();
+  buf.st_uid     = uid;
+  buf.st_gid     = gid;
   buf.st_rdev    = 0;
   buf.st_size    = 0;
   buf.st_blksize = 1024;

src/init.cpp

@@ -36,27 +36,9 @@ namespace mergerfs
     {
       ugid::init();
 
-#ifdef FUSE_CAP_ASYNC_READ
-      conn->want |= FUSE_CAP_ASYNC_READ;
-#endif
 #ifdef FUSE_CAP_IOCTL_DIR
       conn->want |= FUSE_CAP_IOCTL_DIR;
 #endif
-#ifdef FUSE_CAP_ATOMIC_O_TRUNC
-      conn->want |= FUSE_CAP_ATOMIC_O_TRUNC;
-#endif
-#ifdef FUSE_CAP_BIG_WRITES
-      conn->want |= FUSE_CAP_BIG_WRITES;
-#endif
-#ifdef FUSE_CAP_SPLICE_WRITE
-      conn->want |= FUSE_CAP_SPLICE_WRITE;
-#endif
-#ifdef FUSE_CAP_SPLICE_READ
-      conn->want |= FUSE_CAP_SPLICE_READ;
-#endif
-#ifdef FUSE_CAP_SPLICE_MOVE
-      conn->want |= FUSE_CAP_SPLICE_MOVE;
-#endif
 
       return &Config::get_writable();
     }

src/listxattr.cpp

@@ -56,7 +56,7 @@ _listxattr_controlfile(char         *list,
     ("user.mergerfs.policies")
     ("user.mergerfs.version");
 
-  xattrs.reserve(512);
+  xattrs.reserve(1024);
   for(size_t i = 0; i < strs.size(); i++)
     xattrs += (strs[i] + '\0');
   for(size_t i = Category::Enum::BEGIN; i < Category::Enum::END; i++)

src/option_parser.cpp

@@ -94,12 +94,13 @@ static
 void
 set_default_options(fuse_args &args)
 {
-  //  set_option(args,"big_writes");
-  //  set_option(args,"splice_read");
-  //  set_option(args,"splice_write");
-  //  set_option(args,"splice_move");
+  set_option(args,"atomic_o_trunc");
   set_option(args,"auto_cache");
-  //  set_option(args,"atomic_o_trunc");
+  set_option(args,"big_writes");
+  set_option(args,"default_permissions");
+  set_option(args,"splice_move");
+  set_option(args,"splice_read");
+  set_option(args,"splice_write");
 }
 
 static

src/setxattr.cpp

@@ -313,15 +313,10 @@ namespace mergerfs
       const Config       &config = Config::get(fc);
 
       if(fusepath == config.controlfile)
-        {
-          if((fc->uid != ::getuid()) && (fc->gid != ::getgid()))
-            return -EPERM;
-
         return _setxattr_controlfile(Config::get_writable(),
                                      attrname,
                                      string(attrval,attrvalsize),
                                      flags);
-        }
 
       const ugid::Set         ugid(fc->uid,fc->gid);
       const rwlock::ReadGuard readlock(&config.srcmountslock);