# include <linux/mount.h>
# include <linux/seq_file.h>
# include <linux/poll.h>
struct mnt_namespace {
atomic_t count ;
unsigned int proc_inum ;
struct mount * root ;
struct list_head list ;
struct user_namespace * user_ns ;
u64 seq ; /* Sequence number to prevent loops */
wait_queue_head_t poll ;
int event ;
} ;
struct mnt_pcp {
int mnt_count ;
int mnt_writers ;
} ;
struct mountpoint {
struct hlist_node m_hash ;
struct dentry * m_dentry ;
int m_count ;
} ;
struct mount {
struct list_head mnt_hash ;
struct mount * mnt_parent ;
struct dentry * mnt_mountpoint ;
struct vfsmount mnt ;
struct rcu_head mnt_rcu ;
# ifdef CONFIG_SMP
struct mnt_pcp __percpu * mnt_pcp ;
# else
int mnt_count ;
int mnt_writers ;
# endif
struct list_head mnt_mounts ; /* list of children, anchored here */
struct list_head mnt_child ; /* and going through their mnt_child */
struct list_head mnt_instance ; /* mount instance on sb->s_mounts */
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 mount * mnt_master ; /* slave is on master->mnt_slave_list */
struct mnt_namespace * mnt_ns ; /* containing namespace */
struct mountpoint * mnt_mp ; /* where is it mounted */
# ifdef CONFIG_FSNOTIFY
struct hlist_head mnt_fsnotify_marks ;
__u32 mnt_fsnotify_mask ;
# endif
int mnt_id ; /* mount identifier */
int mnt_group_id ; /* peer group identifier */
int mnt_expiry_mark ; /* true if marked for expiry */
int mnt_pinned ;
struct path mnt_ex_mountpoint ;
} ;
# define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
static inline struct mount * real_mount ( struct vfsmount * mnt )
{
return container_of ( mnt , struct mount , mnt ) ;
}
static inline int mnt_has_parent ( struct mount * mnt )
{
return mnt ! = mnt - > mnt_parent ;
}
static inline int is_mounted ( struct vfsmount * mnt )
{
/* neither detached nor internal? */
return ! IS_ERR_OR_NULL ( real_mount ( mnt ) - > mnt_ns ) ;
}
extern struct mount * __lookup_mnt ( struct vfsmount * , struct dentry * ) ;
extern struct mount * __lookup_mnt_last ( struct vfsmount * , struct dentry * ) ;
extern bool legitimize_mnt ( struct vfsmount * , unsigned ) ;
static inline void get_mnt_ns ( struct mnt_namespace * ns )
{
atomic_inc ( & ns - > count ) ;
}
extern seqlock_t mount_lock ;
static inline void lock_mount_hash ( void )
{
write_seqlock ( & mount_lock ) ;
}
static inline void unlock_mount_hash ( void )
{
write_sequnlock ( & mount_lock ) ;
}
struct proc_mounts {
struct seq_file m ;
struct mnt_namespace * ns ;
struct path root ;
int ( * show ) ( struct seq_file * , struct vfsmount * ) ;
} ;
# define proc_mounts(p) (container_of((p), struct proc_mounts, m))
extern const struct seq_operations mounts_op ;