linux-kernel - Re: [fuse-devel] [PATCH 01/25] VFS: move attr_kill logic from notify

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Message-Id: <E1II6cM-0004yj-00@dorka.pomaz.szeredi.hu>
Date:	Mon, 06 Aug 2007 19:43:46 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	jlayton@...hat.com
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	codalist@...EMANN.coda.cs.cmu.edu, cluster-devel@...hat.com,
	jfs-discussion@...ts.sourceforge.net,
	mikulas@...ax.karlin.mff.cuni.cz, zippel@...ux-m68k.org,
	xfs@....sgi.com, joel.becker@...cle.com, wli@...omorphy.com,
	reiserfs-devel@...r.kernel.org, dhowells@...hat.com,
	fuse-devel@...ts.sourceforge.net, jffs-dev@...s.com,
	user-mode-linux-user@...ts.sourceforge.net,
	v9fs-developer@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
	linux-cifs-client@...ts.samba.org, ocfs2-devel@....oracle.com,
	bfennema@...con.csc.calpoly.edu
Subject: Re: [fuse-devel] [PATCH 01/25] VFS: move attr_kill logic from
	notify_change into helper function

> Separate the handling of the local ia_valid bitmask from the one in
> attr->ia_valid. This allows us to hand off the actual handling of the
> ATTR_KILL_* flags to the .setattr i_op when one is defined.
> 
> notify_change still needs to process those flags for the local ia_valid
> variable, since it uses that to decide whether to return early, and to pass
> a (hopefully) appropriate bitmask to fsnotify_change.

I agree with this change and fuse will make use of it as well.

Maybe instead of unconditionally moving attr_kill_to_mode() inside
->setattr() it could be made conditional based on an inode flag
similarly to S_NOCMTIME.  Advantages:

 - no need to modify a lot of in-tree filesystems
 - no silent breakage of out-of-tree fs

Actually I think the new flag would be used by exacly the same
filesystems as S_NOCMTIME, so maybe it would make sense to rename
S_NOCMTIME to something more generic (S_NOATTRUPDATE or whatever) and
use that.

But that could still break out-of-tree fs, so a separate flag is
probably better.

Miklos
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