1 #include <linux/mount.h>
2 #include <linux/seq_file.h>
3 #include <linux/poll.h>
7 unsigned int proc_inum;
10 struct user_namespace *user_ns;
11 u64 seq; /* Sequence number to prevent loops */
12 wait_queue_head_t poll;
22 struct hlist_node m_hash;
23 struct dentry *m_dentry;
28 struct hlist_node mnt_hash;
29 struct mount *mnt_parent;
30 struct dentry *mnt_mountpoint;
33 struct rcu_head mnt_rcu;
34 struct llist_node mnt_llist;
37 struct mnt_pcp __percpu *mnt_pcp;
42 struct list_head mnt_mounts; /* list of children, anchored here */
43 struct list_head mnt_child; /* and going through their mnt_child */
44 struct list_head mnt_instance; /* mount instance on sb->s_mounts */
45 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
46 struct list_head mnt_list;
47 struct list_head mnt_expire; /* link in fs-specific expiry list */
48 struct list_head mnt_share; /* circular list of shared mounts */
49 struct list_head mnt_slave_list;/* list of slave mounts */
50 struct list_head mnt_slave; /* slave list entry */
51 struct mount *mnt_master; /* slave is on master->mnt_slave_list */
52 struct mnt_namespace *mnt_ns; /* containing namespace */
53 struct mountpoint *mnt_mp; /* where is it mounted */
54 #ifdef CONFIG_FSNOTIFY
55 struct hlist_head mnt_fsnotify_marks;
56 __u32 mnt_fsnotify_mask;
58 int mnt_id; /* mount identifier */
59 int mnt_group_id; /* peer group identifier */
60 int mnt_expiry_mark; /* true if marked for expiry */
61 struct hlist_head mnt_pins;
62 struct path mnt_ex_mountpoint;
65 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
67 static inline struct mount *real_mount(struct vfsmount *mnt)
69 return container_of(mnt, struct mount, mnt);
72 static inline int mnt_has_parent(struct mount *mnt)
74 return mnt != mnt->mnt_parent;
77 static inline int is_mounted(struct vfsmount *mnt)
79 /* neither detached nor internal? */
80 return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
83 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
84 extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
86 extern bool legitimize_mnt(struct vfsmount *, unsigned);
88 static inline void get_mnt_ns(struct mnt_namespace *ns)
90 atomic_inc(&ns->count);
93 extern seqlock_t mount_lock;
95 static inline void lock_mount_hash(void)
97 write_seqlock(&mount_lock);
100 static inline void unlock_mount_hash(void)
102 write_sequnlock(&mount_lock);
107 struct mnt_namespace *ns;
109 int (*show)(struct seq_file *, struct vfsmount *);
115 #define proc_mounts(p) (container_of((p), struct proc_mounts, m))
117 extern const struct seq_operations mounts_op;