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Message-ID: <0c9331becf9b4b09ae8f6cf4a8a68d0bb8738022.camel@kernel.org>
Date: Wed, 13 Sep 2023 09:35:23 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Miklos Szeredi <miklos@...redi.hu>,
Amir Goldstein <amir73il@...il.com>,
Nathan Chancellor <nathan@...nel.org>,
Christian Brauner <brauner@...nel.org>,
Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] overlayfs: set ctime when setting mtime and atime
On Wed, 2023-09-13 at 09:33 -0400, Jeff Layton wrote:
> Nathan reported that he was seeing the new warning in
> setattr_copy_mgtime pop when starting podman containers. Overlayfs is
> trying to set the atime and mtime via notify_change without also
> setting the ctime.
>
> POSIX states that when the atime and mtime are updated via utimes() that
> we must also update the ctime to the current time. The situation with
> overlayfs copy-up is analogies, so add ATTR_CTIME to the bitmask.
Bah...make that "analogous".
> notify_change will fill in the value.
>
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
> The new WARN_ON_ONCE in setattr_copy_mgtime caught a bug! Fix up
> overlayfs to ensure that the ctime on the upper inode is also updated
> when copying up the atime and mtime.
> ---
> fs/overlayfs/copy_up.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
> index d1761ec5866a..ada3fcc9c6d5 100644
> --- a/fs/overlayfs/copy_up.c
> +++ b/fs/overlayfs/copy_up.c
> @@ -337,7 +337,7 @@ static int ovl_set_timestamps(struct ovl_fs *ofs, struct dentry *upperdentry,
> {
> struct iattr attr = {
> .ia_valid =
> - ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET,
> + ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_CTIME,
> .ia_atime = stat->atime,
> .ia_mtime = stat->mtime,
> };
>
> ---
> base-commit: 9cb8e7c86ac793862e7bea7904b3426942bbd7ef
> change-id: 20230913-ctime-299173760dd9
>
> Best regards,
--
Jeff Layton <jlayton@...nel.org>
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