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Subject: Re: [PATCH v7 05/13] fat: make fat_update_time get its own timestamp
From:   Jeff Layton <jlayton@kernel.org>
To:     OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Christian Brauner <brauner@kernel.org>,
        Eric Van Hensbergen <ericvh@kernel.org>,
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Date:   Wed, 09 Aug 2023 06:10:53 -0400
In-Reply-To: <87msz08vc7.fsf@mail.parknet.co.jp>
References: <20230807-mgctime-v7-0-d1dec143a704@kernel.org>
         <20230807-mgctime-v7-5-d1dec143a704@kernel.org>
         <87msz08vc7.fsf@mail.parknet.co.jp>
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On Wed, 2023-08-09 at 17:37 +0900, OGAWA Hirofumi wrote:
> Jeff Layton <jlayton@kernel.org> writes:
>=20
> > Also, it may be that things have changed by the time we get to calling
> > fat_update_time after checking inode_needs_update_time. Ensure that we
> > attempt the i_version bump if any of the S_* flags besides S_ATIME are
> > set.
>=20
> I'm not sure what it meaning though, this is from
> generic_update_time(). Are you going to change generic_update_time()
> too? If so, it doesn't break lazytime feature?
>=20

Yes. generic_update_time is also being changed in a similar fashion.
This shouldn't break the lazytime feature: lazytime is all about how and
when timestamps get written to disk. This work is all about which
clocksource the timestamps originally come from.

> Thanks.
>=20
> > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > ---
> >  fs/fat/misc.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >=20
> > diff --git a/fs/fat/misc.c b/fs/fat/misc.c
> > index 67006ea08db6..8cab87145d63 100644
> > --- a/fs/fat/misc.c
> > +++ b/fs/fat/misc.c
> > @@ -347,14 +347,14 @@ int fat_update_time(struct inode *inode, struct t=
imespec64 *now, int flags)
> >  		return 0;
> > =20
> >  	if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
> > -		fat_truncate_time(inode, now, flags);
> > +		fat_truncate_time(inode, NULL, flags);
> >  		if (inode->i_sb->s_flags & SB_LAZYTIME)
> >  			dirty_flags |=3D I_DIRTY_TIME;
> >  		else
> >  			dirty_flags |=3D I_DIRTY_SYNC;
> >  	}
> > =20
> > -	if ((flags & S_VERSION) && inode_maybe_inc_iversion(inode, false))
> > +	if ((flags & (S_VERSION|S_CTIME|S_MTIME)) && inode_maybe_inc_iversion=
(inode, false))
> >  		dirty_flags |=3D I_DIRTY_SYNC;
> > =20
> >  	__mark_inode_dirty(inode, dirty_flags);
>=20

--=20
Jeff Layton <jlayton@kernel.org>