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

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Message-ID: <ZoPs0TfTEktPaCHo@infradead.org>
Date: Tue, 2 Jul 2024 05:04:33 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Jeff Layton <jlayton@...nel.org>
Cc: Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>,
	"Darrick J. Wong" <djwong@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	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 07:44:19AM -0400, Jeff Layton wrote:
> Complaining about it is fairly simple. We could just throw a pr_warn in
> inode_set_ctime_to_ts when the time comes back as KTIME_MAX. This might
> also be what we need to do for filesystems like NFS, where a future
> ctime on the server is not necessarily a problem for the client.
> 
> Refusing to load the inode on disk-based filesystems is harder, but is
> probably possible. There are ~90 calls to inode_set_ctime_to_ts in the
> kernel, so we'd need to vet the places that are loading times from disk
> images or the like and fix them to return errors in this situation.
> 
> Is warning acceptable, or do we really need to reject inodes that have
> corrupt timestamps like this?

inode_set_ctime_to_ts should return an error if things are out of range.
How do we currently catch this when it comes from userland?