On Sun, Sep 23, 2012 at 08:56:28PM +0800, zwu.kernel@xxxxxxxxx wrote: > From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx> > > Introduce one new mount option '-o hottrack', > and add its parsing support. > Its usage looks like: > mount -o hottrack > mount -o nouser,hottrack > mount -o nouser,hottrack,loop > mount -o hottrack,nouser I think that this option parsing should be done by the filesystem, even though the tracking functionality is in the VFS. That way ony the filesystems that can use the tracking information will turn it on, rather than being able to turn it on for everything regardless of whether it is useful or not. Along those lines, just using a normal superblock flag to indicate it is active (e.g. MS_HOT_INODE_TRACKING in sb->s_flags) means you don't need to allocate the sb->s_hot_info structure just to be able to check whether we are tracking hot inodes or not. This then means the hot inode tracking for the superblock can be initialised by the filesystem as part of it's fill_super method, along with the filesystem specific code that will use the hot tracking information the VFS gathers.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
