Christoph Hellwig [off-list ref] writes:

On Thu, May 17, 2018 at 12:28:01AM -0500, Eric W. Biederman wrote:

quoted

quoted

struct pid_namespace *proc_pid_namespace(struct inode *inode)
{
	// maybe warn on for s_magic not on procfs??
	return inode->i_sb->s_fs_info;
}

That should work.  Ideally out of line for the proc_fs.h version.
Basically it should be a cousin of PDE_DATA.

The version in Al's tree is inline and without the warning as
I didn't want to drag in the magic.h include.  Please look at it for
additional comments, I can send incremental fixups if needed.

Sounds good.

Eric