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Message-ID: <16f46a9e6d88582d53d31a320589a7ba9d232e0c.camel@kernel.org>
Date:   Wed, 02 Aug 2023 14:21:49 -0400
From:   Jeff Layton <jlayton@...nel.org>
To:     "Darrick J. Wong" <djwong@...nel.org>,
        Christian Brauner <brauner@...nel.org>
Cc:     Eric Van Hensbergen <ericvh@...nel.org>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Jan Harkes <jaharkes@...cmu.edu>, coda@...cmu.edu,
        Tyler Hicks <code@...icks.com>, Gao Xiang <xiang@...nel.org>,
        Chao Yu <chao@...nel.org>, Yue Hu <huyue2@...lpad.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Jan Kara <jack@...e.com>, Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Miklos Szeredi <miklos@...redi.hu>,
        Bob Peterson <rpeterso@...hat.com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Mike Marshall <hubcap@...ibond.com>,
        Martin Brandenburg <martin@...ibond.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Steve French <sfrench@...ba.org>,
        Paulo Alcantara <pc@...guebit.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Richard Weinberger <richard@....at>,
        Hans de Goede <hdegoede@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Chinner <david@...morbit.com>,
        Anthony Iliopoulos <ailiop@...e.com>, v9fs@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-btrfs@...r.kernel.org, ceph-devel@...r.kernel.org,
        codalist@...a.cs.cmu.edu, ecryptfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        cluster-devel@...hat.com, linux-nfs@...r.kernel.org,
        ntfs3@...ts.linux.dev, ocfs2-devel@...ts.linux.dev,
        devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v6 5/7] xfs: switch to multigrain timestamps

On Wed, 2023-08-02 at 10:48 -0700, Darrick J. Wong wrote:
> On Tue, Jul 25, 2023 at 10:58:18AM -0400, Jeff Layton wrote:
> > Enable multigrain timestamps, which should ensure that there is an
> > apparent change to the timestamp whenever it has been written after
> > being actively observed via getattr.
> > 
> > Also, anytime the mtime changes, the ctime must also change, and those
> > are now the only two options for xfs_trans_ichgtime. Have that function
> > unconditionally bump the ctime, and ASSERT that XFS_ICHGTIME_CHG is
> > always set.
> > 
> > Signed-off-by: Jeff Layton <jlayton@...nel.org>
> > ---
> >  fs/xfs/libxfs/xfs_trans_inode.c | 6 +++---
> >  fs/xfs/xfs_iops.c               | 4 ++--
> >  fs/xfs/xfs_super.c              | 2 +-
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> > 
> > diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_inode.c
> > index 6b2296ff248a..ad22656376d3 100644
> > --- a/fs/xfs/libxfs/xfs_trans_inode.c
> > +++ b/fs/xfs/libxfs/xfs_trans_inode.c
> > @@ -62,12 +62,12 @@ xfs_trans_ichgtime(
> >  	ASSERT(tp);
> >  	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
> >  
> > -	tv = current_time(inode);
> > +	/* If the mtime changes, then ctime must also change */
> > +	ASSERT(flags & XFS_ICHGTIME_CHG);
> >  
> > +	tv = inode_set_ctime_current(inode);
> >  	if (flags & XFS_ICHGTIME_MOD)
> >  		inode->i_mtime = tv;
> > -	if (flags & XFS_ICHGTIME_CHG)
> > -		inode_set_ctime_to_ts(inode, tv);
> >  	if (flags & XFS_ICHGTIME_CREATE)
> >  		ip->i_crtime = tv;
> >  }
> > diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> > index 3a9363953ef2..3f89ef5a2820 100644
> > --- a/fs/xfs/xfs_iops.c
> > +++ b/fs/xfs/xfs_iops.c
> > @@ -573,10 +573,10 @@ xfs_vn_getattr(
> >  	stat->gid = vfsgid_into_kgid(vfsgid);
> >  	stat->ino = ip->i_ino;
> >  	stat->atime = inode->i_atime;
> > -	stat->mtime = inode->i_mtime;
> > -	stat->ctime = inode_get_ctime(inode);
> >  	stat->blocks = XFS_FSB_TO_BB(mp, ip->i_nblocks + ip->i_delayed_blks);
> >  
> > +	fill_mg_cmtime(request_mask, inode, stat);
> 
> Huh.  I would've thought @stat would come first since that's what we're
> acting upon, but ... eh. :)
> 
> If everyone else is ok with the fill_mg_cmtime signature,
> Acked-by: Darrick J. Wong <djwong@...nel.org>
> 
> 

Good point. We can change the signature. I think xfs is the only caller
outside of the generic vfs right now, and it'd be best to do it now.

Christian, would you prefer that I send an updated series, or patches on
top of vfs.ctime that can be folded in?
 
-- 
Jeff Layton <jlayton@...nel.org>

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