linux-kernel - Re: [PATCH] vfs: make unlink() return ENOENT in preference to EROFS

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Date:	Mon, 6 Jun 2011 16:45:19 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH] vfs: make unlink() return ENOENT in preference to EROFS

Hi,

On Mon, Jun 6, 2011 at 4:36 PM, Theodore Ts'o <tytso@....edu> wrote:
> If user space attempts to unlink a non-existent file, and the file
> system is mounted read-only, return ENOENT instead of EROFS.  Either
> error code is arguably valid/correct, but ENOENT is a more specific
> error message.
>
> Reported-by: Michael Tokarev <mjt@....msk.ru>
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
>  fs/namei.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index 1ab641f..a9edbe0 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2708,9 +2708,9 @@ static long do_unlinkat(int dfd, const char __user *pathname)
>        error = PTR_ERR(dentry);
>        if (!IS_ERR(dentry)) {
>                /* Why not before? Because we want correct error value */
> -               if (nd.last.name[nd.last.len])
> -                       goto slashes;
>                inode = dentry->d_inode;
> +               if (nd.last.name[nd.last.len] || !inode)
> +                       goto slashes;
>                if (inode)
>                        ihold(inode);
It seems to me that this conditional will now always be verified as
you jump to `slashes' whenever `inode' is NULL, no ?

 - Arnaud

>                error = mnt_want_write(nd.path.mnt);
> --
> 1.7.4.1.22.gec8e1.dirty
>
> --
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