linux-kernel - Re: [PATCH] tmpfs: disallow CONFIG_TMPFS

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Date:   Mon, 8 Feb 2021 14:54:20 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     Seth Forshee <seth.forshee@...onical.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Chris Down <chris@...isdown.name>,
        Amir Goldstein <amir73il@...il.com>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] tmpfs: disallow CONFIG_TMPFS_INODE64 on alpha

On Mon, 8 Feb 2021, Seth Forshee wrote:

> As with s390, alpha is a 64-bit architecture with a 32-bit ino_t.
> With CONFIG_TMPFS_INODE64=y tmpfs mounts will get 64-bit inode
> numbers and display "inode64" in the mount options, whereas
> passing "inode64" in the mount options will fail. This leads to
> erroneous behaviours such as this:
> 
>  # mkdir mnt
>  # mount -t tmpfs nodev mnt
>  # mount -o remount,rw mnt
>  mount: /home/ubuntu/mnt: mount point not mounted or bad option.
> 
> Prevent CONFIG_TMPFS_INODE64 from being selected on alpha.
> 
> Fixes: ea3271f7196c ("tmpfs: support 64-bit inums per-sb")
> Cc: stable@...r.kernel.org # v5.9+
> Signed-off-by: Seth Forshee <seth.forshee@...onical.com>

Thanks,
Acked-by: Hugh Dickins <hughd@...gle.com>

> ---
>  fs/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 3347ec7bd837..da524c4d7b7e 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -203,7 +203,7 @@ config TMPFS_XATTR
>  
>  config TMPFS_INODE64
>  	bool "Use 64-bit ino_t by default in tmpfs"
> -	depends on TMPFS && 64BIT && !S390
> +	depends on TMPFS && 64BIT && !(S390 || ALPHA)
>  	default n
>  	help
>  	  tmpfs has historically used only inode numbers as wide as an unsigned
> -- 
> 2.29.2