linux-kernel - Re: [PATCH v7 05/13] fat: make fat_update

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Message-ID: <52bead1d6a33fec89944b96e2ec20d1ea8747a9a.camel@kernel.org>
Date:   Wed, 09 Aug 2023 06:10:53 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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Subject: Re: [PATCH v7 05/13] fat: make fat_update_time get its own timestamp

On Wed, 2023-08-09 at 17:37 +0900, OGAWA Hirofumi wrote:
> Jeff Layton <jlayton@...nel.org> writes:
> 
> > 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.
> 
> 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?
> 

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.
> 
> > Signed-off-by: Jeff Layton <jlayton@...nel.org>
> > ---
> >  fs/fat/misc.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > 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 timespec64 *now, int flags)
> >  		return 0;
> >  
> >  	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 |= I_DIRTY_TIME;
> >  		else
> >  			dirty_flags |= I_DIRTY_SYNC;
> >  	}
> >  
> > -	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 |= I_DIRTY_SYNC;
> >  
> >  	__mark_inode_dirty(inode, dirty_flags);
> 

-- 
Jeff Layton <jlayton@...nel.org>