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 struct ucounts *ucounts;
14 u64 seq; /* Sequence number to prevent loops */
15 wait_queue_head_t poll;
25 struct hlist_node m_hash;
26 struct dentry *m_dentry;
27 struct hlist_head m_list;
32 struct hlist_node mnt_hash;
33 struct mount *mnt_parent;
34 struct dentry *mnt_mountpoint;
37 struct rcu_head mnt_rcu;
38 struct llist_node mnt_llist;
41 struct mnt_pcp __percpu *mnt_pcp;
46 struct list_head mnt_mounts; /* list of children, anchored here */
47 struct list_head mnt_child; /* and going through their mnt_child */
48 struct list_head mnt_instance; /* mount instance on sb->s_mounts */
49 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
50 struct list_head mnt_list;
51 struct list_head mnt_expire; /* link in fs-specific expiry list */
52 struct list_head mnt_share; /* circular list of shared mounts */
53 struct list_head mnt_slave_list;/* list of slave mounts */
54 struct list_head mnt_slave; /* slave list entry */
55 struct mount *mnt_master; /* slave is on master->mnt_slave_list */
56 struct mnt_namespace *mnt_ns; /* containing namespace */
57 struct mountpoint *mnt_mp; /* where is it mounted */
58 struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
59 #ifdef CONFIG_FSNOTIFY
60 struct hlist_head mnt_fsnotify_marks;
61 __u32 mnt_fsnotify_mask;
63 int mnt_id; /* mount identifier */
64 int mnt_group_id; /* peer group identifier */
65 int mnt_expiry_mark; /* true if marked for expiry */
66 struct hlist_head mnt_pins;
67 struct fs_pin mnt_umount;
68 struct dentry *mnt_ex_mountpoint;
71 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
73 static inline struct mount *real_mount(struct vfsmount *mnt)
75 return container_of(mnt, struct mount, mnt);
78 static inline int mnt_has_parent(struct mount *mnt)
80 return mnt != mnt->mnt_parent;
83 static inline int is_mounted(struct vfsmount *mnt)
85 /* neither detached nor internal? */
86 return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
89 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
90 extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
92 extern int __legitimize_mnt(struct vfsmount *, unsigned);
93 extern bool legitimize_mnt(struct vfsmount *, unsigned);
95 extern void __detach_mounts(struct dentry *dentry);
97 static inline void detach_mounts(struct dentry *dentry)
99 if (!d_mountpoint(dentry))
101 __detach_mounts(dentry);
104 static inline void get_mnt_ns(struct mnt_namespace *ns)
106 atomic_inc(&ns->count);
109 extern seqlock_t mount_lock;
111 static inline void lock_mount_hash(void)
113 write_seqlock(&mount_lock);
116 static inline void unlock_mount_hash(void)
118 write_sequnlock(&mount_lock);
122 struct mnt_namespace *ns;
124 int (*show)(struct seq_file *, struct vfsmount *);
130 extern const struct seq_operations mounts_op;
132 extern bool __is_local_mountpoint(struct dentry *dentry);
133 static inline bool is_local_mountpoint(struct dentry *dentry)
135 if (!d_mountpoint(dentry))
138 return __is_local_mountpoint(dentry);