linux-imx

/*

 *  linux/fs/pnode.c

 *

 * (C) Copyright IBM Corporation 2005.

 *  Released under GPL v2.

 *  Author : Ram Pai (linuxram@us.ibm.com)

 *

 */

#include <linux/mnt_namespace.h>

#include <linux/mount.h>

#include <linux/fs.h>

#include <linux/nsproxy.h>

#include <uapi/linux/mount.h>

#include "internal.h"

#include "pnode.h"

​

/* return the next shared peer mount of @p */

static inline struct mount *next_peer(struct mount *p)

{

    return list_entry(p->mnt_share.next, struct mount, mnt_share);

}

​

static inline struct mount *first_slave(struct mount *p)

{

    return list_entry(p->mnt_slave_list.next, struct mount, mnt_slave);

}

​

static inline struct mount *last_slave(struct mount *p)

{

    return list_entry(p->mnt_slave_list.prev, struct mount, mnt_slave);

}

​

static inline struct mount *next_slave(struct mount *p)

{

    return list_entry(p->mnt_slave.next, struct mount, mnt_slave);

}

​

static struct mount *get_peer_under_root(struct mount *mnt,

                     struct mnt_namespace *ns,

                     const struct path *root)

{

    struct mount *m = mnt;

​

    do {

        /* Check the namespace first for optimization */

        if (m->mnt_ns == ns && is_path_reachable(m, m->mnt.mnt_root, root))

            return m;

​

        m = next_peer(m);

    } while (m != mnt);

​

    return NULL;

}

​

/*

 * Get ID of closest dominating peer group having a representative

 * under the given root.

 *

 * Caller must hold namespace_sem

 */

int get_dominating_id(struct mount *mnt, const struct path *root)

{

    struct mount *m;