vfs vfsmount

struct vfsmount {
    struct list_head mnt_hash;
    struct vfsmount *mnt_parent;    /* fs we are mounted on */
    struct dentry *mnt_mountpoint;    /* dentry of mountpoint */
    struct dentry *mnt_root;    /* root of the mounted tree */
    struct super_block *mnt_sb;    /* pointer to superblock */
    struct list_head mnt_mounts;    /* list of children, anchored here */
    struct list_head mnt_child;    /* and going through their mnt_child */
    int mnt_flags;
    /* 4 bytes hole on 64bits arches */
    const char *mnt_devname;    /* Name of device e.g. /dev/dsk/hda1 */
    struct list_head mnt_list;
    struct list_head mnt_expire;    /* link in fs-specific expiry list */
    struct list_head mnt_share;    /* circular list of shared mounts */
    struct list_head mnt_slave_list;/* list of slave mounts */
    struct list_head mnt_slave;    /* slave list entry */
    struct vfsmount *mnt_master;    /* slave is on master->mnt_slave_list */
    struct mnt_namespace *mnt_ns;    /* containing namespace */
    int mnt_id;            /* mount identifier */
    int mnt_group_id;        /* peer group identifier */
    /*
     * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
     * to let these frequently modified fields in a separate cache line
     * (so that reads of mnt_flags wont ping-pong on SMP machines)
     */
    atomic_t mnt_count;
    int mnt_expiry_mark;        /* true if marked for expiry */
    int mnt_pinned;
    int mnt_ghosts;
#ifdef CONFIG_SMP
    int *mnt_writers;
#else
    int mnt_writers;
#endif
};