linux-kernel - Re: [PATCH] vboxsf: explicitly deny setlease attempts

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Date: Wed, 3 Apr 2024 16:10:32 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Jeff Layton <jlayton@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vboxsf: explicitly deny setlease attempts

Hi,

On 3/19/24 5:32 PM, Jeff Layton wrote:
> vboxsf does not break leases on its own, so it can't properly handle the
> case where the hypervisor changes the data. Don't allow file leases on
> vboxsf.
> 
> Signed-off-by: Jeff Layton <jlayton@...nel.org>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

I have added this to my local vboxsf branch now and I'll send
out a pull-request with this and a couple of other vboxsf fixes
soon.

Regards,

Hans




> ---
> Looking over the comments in the code around cache coherency, it seems
> like it ought to deny file locks as well? We could add a stub ->lock
> routine that just returns -ENOLCK or something.
> ---
>  fs/vboxsf/file.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c
> index 2307f8037efc..118dedef8ebe 100644
> --- a/fs/vboxsf/file.c
> +++ b/fs/vboxsf/file.c
> @@ -218,6 +218,7 @@ const struct file_operations vboxsf_reg_fops = {
>  	.release = vboxsf_file_release,
>  	.fsync = noop_fsync,
>  	.splice_read = filemap_splice_read,
> +	.setlease = simple_nosetlease,
>  };
>  
>  const struct inode_operations vboxsf_reg_iops = {
> 
> ---
> base-commit: 0a7b0acecea273c8816f4f5b0e189989470404cf
> change-id: 20240319-setlease-ce31fb8777b0
> 
> Best regards,