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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> | |
6 | ||
7 | struct mnt_namespace { | |
8 | atomic_t count; | |
9 | struct ns_common ns; | |
10 | struct mount * root; | |
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; | |
16 | u64 event; | |
17 | }; | |
18 | ||
19 | struct mnt_pcp { | |
20 | int mnt_count; | |
21 | int mnt_writers; | |
22 | }; | |
23 | ||
24 | struct mountpoint { | |
25 | struct hlist_node m_hash; | |
26 | struct dentry *m_dentry; | |
27 | struct hlist_head m_list; | |
28 | int m_count; | |
29 | }; | |
30 | ||
31 | struct mount { | |
32 | struct hlist_node mnt_hash; | |
33 | struct mount *mnt_parent; | |
34 | struct dentry *mnt_mountpoint; | |
35 | struct vfsmount mnt; | |
36 | union { | |
37 | struct rcu_head mnt_rcu; | |
38 | struct llist_node mnt_llist; | |
39 | }; | |
40 | #ifdef CONFIG_SMP | |
41 | struct mnt_pcp __percpu *mnt_pcp; | |
42 | #else | |
43 | int mnt_count; | |
44 | int mnt_writers; | |
45 | #endif | |
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; | |
62 | #endif | |
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; | |
69 | }; | |
70 | ||
71 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ | |
72 | ||
73 | static inline struct mount *real_mount(struct vfsmount *mnt) | |
74 | { | |
75 | return container_of(mnt, struct mount, mnt); | |
76 | } | |
77 | ||
78 | static inline int mnt_has_parent(struct mount *mnt) | |
79 | { | |
80 | return mnt != mnt->mnt_parent; | |
81 | } | |
82 | ||
83 | static inline int is_mounted(struct vfsmount *mnt) | |
84 | { | |
85 | /* neither detached nor internal? */ | |
86 | return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); | |
87 | } | |
88 | ||
89 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); | |
90 | extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); | |
91 | ||
92 | extern int __legitimize_mnt(struct vfsmount *, unsigned); | |
93 | extern bool legitimize_mnt(struct vfsmount *, unsigned); | |
94 | ||
95 | extern void __detach_mounts(struct dentry *dentry); | |
96 | ||
97 | static inline void detach_mounts(struct dentry *dentry) | |
98 | { | |
99 | if (!d_mountpoint(dentry)) | |
100 | return; | |
101 | __detach_mounts(dentry); | |
102 | } | |
103 | ||
104 | static inline void get_mnt_ns(struct mnt_namespace *ns) | |
105 | { | |
106 | atomic_inc(&ns->count); | |
107 | } | |
108 | ||
109 | extern seqlock_t mount_lock; | |
110 | ||
111 | static inline void lock_mount_hash(void) | |
112 | { | |
113 | write_seqlock(&mount_lock); | |
114 | } | |
115 | ||
116 | static inline void unlock_mount_hash(void) | |
117 | { | |
118 | write_sequnlock(&mount_lock); | |
119 | } | |
120 | ||
121 | struct proc_mounts { | |
122 | struct mnt_namespace *ns; | |
123 | struct path root; | |
124 | int (*show)(struct seq_file *, struct vfsmount *); | |
125 | void *cached_mount; | |
126 | u64 cached_event; | |
127 | loff_t cached_index; | |
128 | }; | |
129 | ||
130 | extern const struct seq_operations mounts_op; | |
131 | ||
132 | extern bool __is_local_mountpoint(struct dentry *dentry); | |
133 | static inline bool is_local_mountpoint(struct dentry *dentry) | |
134 | { | |
135 | if (!d_mountpoint(dentry)) | |
136 | return false; | |
137 | ||
138 | return __is_local_mountpoint(dentry); | |
139 | } |