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Date:   Wed, 5 Apr 2023 13:07:52 +0200
From:   Andrey Albershteyn <aalbersh@...hat.com>
To:     Dave Chinner <david@...morbit.com>, ebiggers@...nel.org
Cc:     Eric Biggers <ebiggers@...nel.org>, djwong@...nel.org,
        dchinner@...hat.com, hch@...radead.org, linux-xfs@...r.kernel.org,
        fsverity@...ts.linux.dev, rpeterso@...hat.com, agruenba@...hat.com,
        xiang@...nel.org, chao@...nel.org,
        damien.lemoal@...nsource.wdc.com, jth@...nel.org,
        linux-erofs@...ts.ozlabs.org, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        cluster-devel@...hat.com
Subject: Re: [PATCH v2 16/23] xfs: add inode on-disk VERITY flag

Hi Eric and Dave,

On Wed, Apr 05, 2023 at 09:56:33AM +1000, Dave Chinner wrote:
> On Tue, Apr 04, 2023 at 03:41:23PM -0700, Eric Biggers wrote:
> > Hi Andrey,
> > 
> > On Tue, Apr 04, 2023 at 04:53:12PM +0200, Andrey Albershteyn wrote:
> > > Add flag to mark inodes which have fs-verity enabled on them (i.e.
> > > descriptor exist and tree is built).
> > > 
> > > Signed-off-by: Andrey Albershteyn <aalbersh@...hat.com>
> > > ---
> > >  fs/ioctl.c                 | 4 ++++
> > >  fs/xfs/libxfs/xfs_format.h | 4 +++-
> > >  fs/xfs/xfs_inode.c         | 2 ++
> > >  fs/xfs/xfs_iops.c          | 2 ++
> > >  include/uapi/linux/fs.h    | 1 +
> > >  5 files changed, 12 insertions(+), 1 deletion(-)
> > [...]
> > > diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> > > index b7b56871029c..5172a2eb902c 100644
> > > --- a/include/uapi/linux/fs.h
> > > +++ b/include/uapi/linux/fs.h
> > > @@ -140,6 +140,7 @@ struct fsxattr {
> > >  #define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
> > >  #define FS_XFLAG_DAX		0x00008000	/* use DAX for IO */
> > >  #define FS_XFLAG_COWEXTSIZE	0x00010000	/* CoW extent size allocator hint */
> > > +#define FS_XFLAG_VERITY		0x00020000	/* fs-verity sealed inode */
> > >  #define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/
> > >  
> > 
> > I don't think "xfs: add inode on-disk VERITY flag" is an accurate description of
> > a patch that involves adding something to the UAPI.
> 
> Well it does that, but it also adds the UAPI for querying the
> on-disk flag via the FS_IOC_FSGETXATTR interface as well.  It
> probably should be split up into two patches.

Sure.

> 
> > Should the other filesystems support this new flag too?
> 
> I think they should get it automatically now that it has been
> defined for FS_IOC_FSGETXATTR and added to the generic fileattr flag
> fill functions in fs/ioctl.c.
> 
> > I'd also like all ways of getting the verity flag to continue to be mentioned in
> > Documentation/filesystems/fsverity.rst.  The existing methods (FS_IOC_GETFLAGS
> > and statx) are already mentioned there.
> 
> *nod*
> 

Ok, sure, missed that. Will split this patch and add description.

-- 
- Andrey

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