Re: [PATCH RESEND v4 6/8] vfs: Add get_vfsmount_sb() function to get vfsmount from a given sb.

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Adding Al Viro into CC

On Thu, Jan 29, 2015 at 10:24:39AM +0800, Qu Wenruo wrote:
> +struct vfsmount *get_vfsmount_sb(struct super_block *sb)
> +{
> +	struct vfsmount *ret_vfs = NULL;
> +	struct mount *mnt;
> +	int ret = 0;
> +
> +	lock_mount_hash();
> +	if (list_empty(&sb->s_mounts))
> +		goto out;
> +	mnt = list_entry(sb->s_mounts.next, struct mount, mnt_instance);

from include/linux/fs.h:

struct super_block {
...
	struct list_head        s_mounts;       /* list of mounts; _not_ for fs use */
...
};

I hear a storm in the distance coming our direction ... so I'll
preemptively NAK this change.
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