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Re: [PATCH-v4 1/7] vfs: split update_time() into update_time() and write

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH-v4 1/7] vfs: split update_time() into update_time() and write_time()
From: Jan Kara <jack@xxxxxxx>
Date: Thu, 27 Nov 2014 13:34:29 +0100
Cc: Theodore Ts'o <tytso@xxxxxxx>, Linux Filesystem Development List <linux-fsdevel@xxxxxxxxxxxxxxx>, Ext4 Developers List <linux-ext4@xxxxxxxxxxxxxxx>, Linux btrfs Developers List <linux-btrfs@xxxxxxxxxxxxxxx>, XFS Developers <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20141126192328.GA20436@xxxxxxxxxxxxx>
References: <1416997437-26092-1-git-send-email-tytso@xxxxxxx> <1416997437-26092-2-git-send-email-tytso@xxxxxxx> <20141126192328.GA20436@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Wed 26-11-14 11:23:28, Christoph Hellwig wrote:
> As mentioned last round please move the addition of the is_readonly
> operation to the first thing in the series, so that the ordering makes
> more sense.
> Second I think this patch is incorrect for XFS - XFS uses ->update_time
> to set the time stampst in the dinode.  These two need to be coherent
> as we can write out a dirty inode any time, so it needs to have the
> timestamp uptodate.
  But Ted changed XFS to copy timestamps to on-disk structure from the
in-memory inode fields after VFS updated the timestamps. So the stamps
should be coherent AFAICT, shouldn't they?

> Third update_time now calls mark_inode_dirty unconditionally, while
> previously it wasn't called when ->update_time was set.  At least
> for XFS that's a major change in behavior as XFS never used VFS dirty
> tracking for metadata updates.
  We don't call mark_inode_dirty() when ->write_time is set (note the
return, I missed it on the first reading) which looks sensible to me.

Jan Kara <jack@xxxxxxx>

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