linux-kernel - Re: [PATCH 01/10] fs: turn inode ctime fields into a single ktime

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Date: Tue, 2 Jul 2024 18:18:57 +0200
From: Christian Brauner <brauner@...nel.org>
To: Jeff Layton <jlayton@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>, 
	"Darrick J. Wong" <djwong@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Chandan Babu R <chandan.babu@...cle.com>, 
	Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, 
	Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, 
	David Sterba <dsterba@...e.com>, Hugh Dickins <hughd@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, kernel-team@...com, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, linux-xfs@...r.kernel.org, 
	linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org, linux-mm@...ck.org, 
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH 01/10] fs: turn inode ctime fields into a single ktime_t

On Tue, Jul 02, 2024 at 08:21:42AM GMT, Jeff Layton wrote:
> On Tue, 2024-07-02 at 05:15 -0700, Christoph Hellwig wrote:
> > On Tue, Jul 02, 2024 at 08:09:46AM -0400, Jeff Layton wrote:
> > > > > corrupt timestamps like this?
> > > > 
> > > > inode_set_ctime_to_ts should return an error if things are out of
> > > > range.
> > > 
> > > Currently it just returns the timespec64 we're setting it to (which
> > > makes it easy to do several assignments), so we'd need to change
> > > its
> > > prototype to handle this case, and fix up the callers to recognize
> > > the
> > > error.
> > > 
> > > Alternately it may be easier to just add in a test for when
> > > __i_ctime == KTIME_MAX in the appropriate callers and have them
> > > error
> > > out. I'll have a look and see what makes sense.
> > 
> > The seems like a more awkward interface vs one that explicitly
> > checks.
> > 
> 
> Many of the existing callers of inode_ctime_to_ts are in void return
> functions. They're just copying data from an internal representation to
> struct inode and assume it always succeeds. For those we'll probably
> have to catch bad ctime values earlier.
> 
> So, I think I'll probably have to roll bespoke error handling in all of
> the relevant filesystems if we go this route. There are also

Shudder, let's try and avoid that.