linux-kernel - Re: [PATCH] debugfs: ignore auto and noauto options if given

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Message-ID: <20240527100618.np2wqiw5mz7as3vk@ninjato>
Date: Mon, 27 May 2024 12:06:18 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Christian Brauner <brauner@...nel.org>
Cc: Eric Sandeen <sandeen@...hat.com>, linux-renesas-soc@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] debugfs: ignore auto and noauto options if given

Hi Christian,

> Afaict, the "auto" option has either never existent or it was removed before
> the new mount api conversion time ago for debugfs.

Frankly, I have no idea why I put this 'auto' in my fstab ages ago. But
it seems, I am not the only one[1].

[1] https://www.ibm.com/docs/en/linux-on-systems?topic=assumptions-debugfs

> diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
> index dc51df0b118d..713b6f76e75d 100644
> --- a/fs/debugfs/inode.c
> +++ b/fs/debugfs/inode.c
> @@ -107,8 +107,16 @@ static int debugfs_parse_param(struct fs_context *fc, struct fs_parameter *param
>         int opt;
> 
>         opt = fs_parse(fc, debugfs_param_specs, param, &result);
> -       if (opt < 0)
> +       if (opt < 0) {
> +               /*
> +                * We might like to report bad mount options here; but
> +                * traditionally debugfs has ignored all mount options
> +                */
> +               if (opt == -ENOPARAM)
> +                       return 0;
> +
>                 return opt;
> +       }
> 
>         switch (opt) {
>         case Opt_uid:
> 
> 
> Does that fix it for you?

Yes, it does, thank you.

Reported-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Happy hacking,

   Wolfram


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