Re: [RFC PATCH 3/3] fuse: add per-file DAX flag

On 7/16/21 8:51 AM, Vivek Goyal wrote:

On Fri, Jul 16, 2021 at 08:40:29AM +0800, Liu Bo wrote:

quoted

On Thu, Jul 15, 2021 at 05:30:31PM +0800, Jeffle Xu wrote:

quoted

Add one flag for fuse_attr.flags indicating if DAX shall be enabled for
this file.

When the per-file DAX flag changes for an *opened* file, the state of
the file won't be updated until this file is closed and reopened later.

Currently it is not implemented yet to change per-file DAX flag inside
guest kernel, e.g., by chattr(1).

Thanks for the patch, it looks good to me.

I think it's a good starting point, what I'd like to discuss here is
whether we're going to let chattr to toggle the dax flag.

I have the same question. Why not take chattr approach as taken
by ext4/xfs as well.

Vivek

Thanks.

We can implement the chattr approach as ext4/xfs do, if we have this use
scenario. It's an RFC patch, and I want to collect more feedback as soon
as possible.

-- 
Thanks,
Jeffle
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