- Added a version of _RestoreAttributes() that accepts a fd as a parameter.

Usefull when, for some reason, you already have an fd around.
- Changed the non-parameter version to set the fd and call the parametrized
  version.
- CD-Text reasing is expensive (takes up to 4 seconds on my machine) so now it
  is only done if this is the first time the CD is inserted (technically, if it
  errors out when trying to open the attributes file for the CD). With this, the
  first time I mount a CD still takes 4 seconds, but consecutive mounts happen
  almost instantaneously.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27109 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/cdda/kernel_interface.cpp

@@ -110,6 +110,7 @@ class Volume {
 		int			_OpenAttributes(int mode,
 						enum attr_mode attrMode = kDiscIDAttributes);
 		void		_RestoreAttributes();
+		void		_RestoreAttributes(int fd);
 		void		_StoreAttributes();
 		void		_RestoreSharedAttributes();
 		void		_StoreSharedAttributes();
@@ -580,11 +581,17 @@ Volume::Mount(const char* device)
 
 	bool doLookup = true;
 	cdtext text;
-	if (read_cdtext(fDevice, text) < B_OK)
-		dprintf("CDDA: no CD-Text found.\n");
-	else
-		doLookup = false;
-
+	int fd = _OpenAttributes(O_RDONLY);
+	if (fd < 0) {
+		// We do not seem to have an attribute file so this is probably the
+		// first time this CD is inserted. In this case, try to read CD-Text
+		// data.
+		if (read_cdtext(fDevice, text) < B_OK)
+			dprintf("CDDA: no CD-Text found.\n");
+		else
+			doLookup = false;	 
+	}
+		
 	int32 trackCount = toc->last_track + 1 - toc->first_track;
 	off_t totalFrames = 0;
 	char title[256];
@@ -653,7 +660,8 @@ Volume::Mount(const char* device)
 		(const uint8*)&doLookup, sizeof(bool));
 
 	_RestoreSharedAttributes();
-	_RestoreAttributes();
+	if (fd >= 0)
+		_RestoreAttributes(fd);
 
 	free(toc);
 
@@ -818,12 +826,19 @@ Volume::_RestoreAttributes()
 	int fd = _OpenAttributes(O_RDONLY);
 	if (fd < 0)
 		return;
+		
+	_RestoreAttributes(fd);
+	
+	close(fd);
+}
 
+
+void
+Volume::_RestoreAttributes(int fd)
+{
 	char line[B_FILE_NAME_LENGTH];
-	if (!read_line(fd, line, B_FILE_NAME_LENGTH)) {
-		close(fd);
+	if (!read_line(fd, line, B_FILE_NAME_LENGTH))
 		return;
-	}
 
 	SetName(line);
 
@@ -840,8 +855,6 @@ Volume::_RestoreAttributes()
 				break;
 		}
 	}
-
-	close(fd);
 }