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Message-ID: <20200415203433.GB2309605@iweiny-DESK2.sc.intel.com>
Date: Wed, 15 Apr 2020 13:34:33 -0700
From: Ira Weiny <ira.weiny@...el.com>
To: Jan Kara <jack@...e.cz>
Cc: linux-kernel@...r.kernel.org,
"Darrick J. Wong" <darrick.wong@...cle.com>,
Dan Williams <dan.j.williams@...el.com>,
Dave Chinner <david@...morbit.com>,
Christoph Hellwig <hch@....de>,
"Theodore Y. Ts'o" <tytso@....edu>, Jeff Moyer <jmoyer@...hat.com>,
linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH RFC 2/8] fs/ext4: Disallow verity if inode is DAX
On Wed, Apr 15, 2020 at 02:00:02PM +0200, Jan Kara wrote:
> On Mon 13-04-20 21:00:24, ira.weiny@...el.com wrote:
> > From: Ira Weiny <ira.weiny@...el.com>
> >
> > Verity and DAX are incompatible. Changing the DAX mode due to a verity
> > flag change is wrong without a corresponding address_space_operations
> > update.
> >
> > Make the 2 options mutually exclusive by returning an error if DAX was
> > set first.
> >
> > (Setting DAX is already disabled if Verity is set first.)
> >
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> > ---
> > fs/ext4/verity.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
> > index dc5ec724d889..ce3f9a198d3b 100644
> > --- a/fs/ext4/verity.c
> > +++ b/fs/ext4/verity.c
> > @@ -113,6 +113,9 @@ static int ext4_begin_enable_verity(struct file *filp)
> > handle_t *handle;
> > int err;
> >
> > + if (WARN_ON_ONCE(IS_DAX(inode)))
> > + return -EINVAL;
> > +
>
> Hum, one question, is there a reason for WARN_ON_ONCE()? If I understand
> correctly, user could normally trigger this, couldn't he?
Removed and added to the verity doc.
Ira
>
> Honza
>
> > if (ext4_verity_in_progress(inode))
> > return -EBUSY;
> >
> > --
> > 2.25.1
> >
> --
> Jan Kara <jack@...e.com>
> SUSE Labs, CR
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