1 #include <linux/mount.h>
2 #include <linux/seq_file.h>
3 #include <linux/poll.h>
4 #include <linux/ns_common.h>
5 #include <linux/fs_pin.h>
11 struct list_head list;
12 struct user_namespace *user_ns;
13 u64 seq; /* Sequence number to prevent loops */
14 wait_queue_head_t poll;
24 struct hlist_node m_hash;
25 struct dentry *m_dentry;
26 struct hlist_head m_list;
31 struct hlist_node mnt_hash;
32 struct mount *mnt_parent;
33 struct dentry *mnt_mountpoint;
36 struct rcu_head mnt_rcu;
37 struct llist_node mnt_llist;
40 struct mnt_pcp __percpu *mnt_pcp;
45 struct list_head mnt_mounts; /* list of children, anchored here */
46 struct list_head mnt_child; /* and going through their mnt_child */
47 struct list_head mnt_instance; /* mount instance on sb->s_mounts */
48 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
49 struct list_head mnt_list;
50 struct list_head mnt_expire; /* link in fs-specific expiry list */
51 struct list_head mnt_share; /* circular list of shared mounts */
52 struct list_head mnt_slave_list;/* list of slave mounts */
53 struct list_head mnt_slave; /* slave list entry */
54 struct mount *mnt_master; /* slave is on master->mnt_slave_list */
55 struct mnt_namespace *mnt_ns; /* containing namespace */
56 struct mountpoint *mnt_mp; /* where is it mounted */
57 struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
58 #ifdef CONFIG_FSNOTIFY
59 struct hlist_head mnt_fsnotify_marks;
60 __u32 mnt_fsnotify_mask;
62 int mnt_id; /* mount identifier */
63 int mnt_group_id; /* peer group identifier */
64 int mnt_expiry_mark; /* true if marked for expiry */
65 struct hlist_head mnt_pins;
66 struct fs_pin mnt_umount;
67 struct dentry *mnt_ex_mountpoint;
70 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
72 static inline struct mount *real_mount(struct vfsmount *mnt)
74 return container_of(mnt, struct mount, mnt);
77 static inline int mnt_has_parent(struct mount *mnt)
79 return mnt != mnt->mnt_parent;
82 static inline int is_mounted(struct vfsmount *mnt)
84 /* neither detached nor internal? */
85 return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
88 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
89 extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
91 extern int __legitimize_mnt(struct vfsmount *, unsigned);
92 extern bool legitimize_mnt(struct vfsmount *, unsigned);
94 extern void __detach_mounts(struct dentry *dentry);
96 static inline void detach_mounts(struct dentry *dentry)
98 if (!d_mountpoint(dentry))
100 __detach_mounts(dentry);
103 static inline void get_mnt_ns(struct mnt_namespace *ns)
105 atomic_inc(&ns->count);
108 extern seqlock_t mount_lock;
110 static inline void lock_mount_hash(void)
112 write_seqlock(&mount_lock);
115 static inline void unlock_mount_hash(void)
117 write_sequnlock(&mount_lock);
122 struct mnt_namespace *ns;
124 int (*show)(struct seq_file *, struct vfsmount *);
130 #define proc_mounts(p) (container_of((p), struct proc_mounts, m))
132 extern const struct seq_operations mounts_op;
134 extern bool __is_local_mountpoint(struct dentry *dentry);
135 static inline bool is_local_mountpoint(struct dentry *dentry)
137 if (!d_mountpoint(dentry))
140 return __is_local_mountpoint(dentry);