Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To:     Jan Kara <jack@suse.cz>
Cc:     Jeff Layton <jlayton@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Christian Brauner <brauner@kernel.org>,
        Eric Van Hensbergen <ericvh@kernel.org>,
        Latchesar Ionkov <lucho@ionkov.net>,
        Dominique Martinet <asmadeus@codewreck.org>,
        Christian Schoenebeck <linux_oss@crudebyte.com>,
        David Howells <dhowells@redhat.com>,
        Marc Dionne <marc.dionne@auristor.com>,
        Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>,
        David Sterba <dsterba@suse.com>, Xiubo Li <xiubli@redhat.com>,
        Ilya Dryomov <idryomov@gmail.com>,
        Jan Harkes <jaharkes@cs.cmu.edu>, coda@cs.cmu.edu,
        Tyler Hicks <code@tyhicks.com>, Gao Xiang <xiang@kernel.org>,
        Chao Yu <chao@kernel.org>,
        Yue Hu <huyue2@gl0jj8bn.sched.sma.tdnsstic1.cn>,
        Jeffle Xu <jefflexu@linux.alibaba.com>,
        Namjae Jeon <linkinjeon@kernel.org>,
        Sungjong Seo <sj1557.seo@samsung.com>,
        Jan Kara <jack@suse.com>, "Theodore Ts'o" <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        Miklos Szeredi <miklos@szeredi.hu>,
        Bob Peterson <rpeterso@redhat.com>,
        Andreas Gruenbacher <agruenba@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Tejun Heo <tj@kernel.org>,
        Trond Myklebust <trond.myklebust@hammerspace.com>,
        Anna Schumaker <anna@kernel.org>,
        Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
        Mark Fasheh <mark@fasheh.com>,
        Joel Becker <jlbec@evilplan.org>,
        Joseph Qi <joseph.qi@linux.alibaba.com>,
        Mike Marshall <hubcap@omnibond.com>,
        Martin Brandenburg <martin@omnibond.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Iurii Zaikin <yzaikin@google.com>,
        Steve French <sfrench@samba.org>,
        Paulo Alcantara <pc@manguebit.com>,
        Ronnie Sahlberg <ronniesahlberg@gmail.com>,
        Shyam Prasad N <sprasad@microsoft.com>,
        Tom Talpey <tom@talpey.com>,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Richard Weinberger <richard@nod.at>,
        Hans de Goede <hdegoede@redhat.com>,
        Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Amir Goldstein <amir73il@gmail.com>,
        "Darrick J. Wong" <djwong@kernel.org>,
        Benjamin Coddington <bcodding@redhat.com>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        v9fs@lists.linux.dev, linux-afs@lists.infradead.org,
        linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org,
        codalist@telemann.coda.cs.cmu.edu, ecryptfs@vger.kernel.org,
        linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com,
        linux-nfs@vger.kernel.org, ntfs3@lists.linux.dev,
        ocfs2-devel@lists.linux.dev, devel@lists.orangefs.org,
        linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
        linux-mtd@lists.infradead.org, linux-mm@kvack.org,
        linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH v7 05/13] fat: make fat_update_time get its own timestamp
In-Reply-To: <20230809150041.452w7gucjmvjnvbg@quack3> (Jan Kara's message of
        "Wed, 9 Aug 2023 17:00:41 +0200")
References: <20230807-mgctime-v7-0-d1dec143a704@kernel.org>
        <20230807-mgctime-v7-5-d1dec143a704@kernel.org>
        <87msz08vc7.fsf@mail.parknet.co.jp>
        <52bead1d6a33fec89944b96e2ec20d1ea8747a9a.camel@kernel.org>
        <878rak8hia.fsf@mail.parknet.co.jp>
        <20230809150041.452w7gucjmvjnvbg@quack3>
Date:   Thu, 10 Aug 2023 00:17:57 +0900
Message-ID: <87v8do6y8q.fsf@mail.parknet.co.jp>
User-Agent: Gnus/5.13 (Gnus v5.13)
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Jan Kara <jack@suse.cz> writes:

> Since you are talking past one another with Jeff let me chime in here :). I
> think you are worried about this hunk:

Right.

> -	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;
>
> which makes the 'flags' test pass even if we just modified ctime or mtime.
> But do note the second part of the if - inode_maybe_inc_iversion() - so we
> are going to mark the inode dirty with I_DIRTY_SYNC only if someone queried
> iversion since the last time we have incremented it.
>
> So this hunk is not really changing how inode is marked dirty, it only
> changes how often we check whether iversion needs increment and that should
> be fine (and desirable). Hence lazytime isn't really broken by this in any
> way.

OK. However, then it doesn't explain what I asked. This is not same with
generic_update_time(), only FAT does.

If thinks it is right thing, why generic_update_time() doesn't? I said
first reply, this was from generic_update_time(). (Or I'm misreading
updated generic_update_time()?)

Thanks.
-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>