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Date:	Thu, 27 Sep 2012 17:05:08 +1000
From:	Dave Chinner <>
To:	Zhi Yong Wu <>
	Zhi Yong Wu <>
Subject: Re: [RFC v2 03/10] vfs: add one new mount option '-o hottrack'

On Thu, Sep 27, 2012 at 01:25:34PM +0800, Zhi Yong Wu wrote:
> On Tue, Sep 25, 2012 at 5:28 PM, Dave Chinner <> wrote:
> > On Sun, Sep 23, 2012 at 08:56:28PM +0800, wrote:
> >> From: Zhi Yong Wu <>
> >>
> >>   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
> If we don't allocate one sb->s_hot_info, where will those hash list
> head and btree roots locate?

I wrote that thinking (mistakenly) that s-hot)info was dynamically
allocated rather than being embedded in the struct super_block.

Indeed, if the mount option is held in s_flags, then it could be
dynamically allocated, but I don't think that's really necessary...


Dave Chinner
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