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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 | unsigned int mounts; /* # of mounts in the namespace */ | |
18 | unsigned int pending_mounts; | |
19 | } __randomize_layout; | |
20 | ||
21 | struct mnt_pcp { | |
22 | int mnt_count; | |
23 | int mnt_writers; | |
24 | }; | |
25 | ||
26 | struct mountpoint { | |
27 | struct hlist_node m_hash; | |
28 | struct dentry *m_dentry; | |
29 | struct hlist_head m_list; | |
30 | int m_count; | |
31 | }; | |
32 | ||
33 | struct mount { | |
34 | struct hlist_node mnt_hash; | |
35 | struct mount *mnt_parent; | |
36 | struct dentry *mnt_mountpoint; | |
37 | struct vfsmount mnt; | |
38 | union { | |
39 | struct rcu_head mnt_rcu; | |
40 | struct llist_node mnt_llist; | |
41 | }; | |
42 | #ifdef CONFIG_SMP | |
43 | struct mnt_pcp __percpu *mnt_pcp; | |
44 | #else | |
45 | int mnt_count; | |
46 | int mnt_writers; | |
47 | #endif | |
48 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
49 | struct list_head mnt_child; /* and going through their mnt_child */ | |
50 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ | |
51 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ | |
52 | struct list_head mnt_list; | |
53 | struct list_head mnt_expire; /* link in fs-specific expiry list */ | |
54 | struct list_head mnt_share; /* circular list of shared mounts */ | |
55 | struct list_head mnt_slave_list;/* list of slave mounts */ | |
56 | struct list_head mnt_slave; /* slave list entry */ | |
57 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ | |
58 | struct mnt_namespace *mnt_ns; /* containing namespace */ | |
59 | struct mountpoint *mnt_mp; /* where is it mounted */ | |
60 | struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */ | |
61 | struct list_head mnt_umounting; /* list entry for umount propagation */ | |
62 | #ifdef CONFIG_FSNOTIFY | |
63 | struct fsnotify_mark_connector __rcu *mnt_fsnotify_marks; | |
64 | __u32 mnt_fsnotify_mask; | |
65 | #endif | |
66 | int mnt_id; /* mount identifier */ | |
67 | int mnt_group_id; /* peer group identifier */ | |
68 | int mnt_expiry_mark; /* true if marked for expiry */ | |
69 | struct hlist_head mnt_pins; | |
70 | struct fs_pin mnt_umount; | |
71 | struct dentry *mnt_ex_mountpoint; | |
72 | } __randomize_layout; | |
73 | ||
74 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ | |
75 | ||
76 | static inline struct mount *real_mount(struct vfsmount *mnt) | |
77 | { | |
78 | return container_of(mnt, struct mount, mnt); | |
79 | } | |
80 | ||
81 | static inline int mnt_has_parent(struct mount *mnt) | |
82 | { | |
83 | return mnt != mnt->mnt_parent; | |
84 | } | |
85 | ||
86 | static inline int is_mounted(struct vfsmount *mnt) | |
87 | { | |
88 | /* neither detached nor internal? */ | |
89 | return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); | |
90 | } | |
91 | ||
92 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); | |
93 | ||
94 | extern int __legitimize_mnt(struct vfsmount *, unsigned); | |
95 | extern bool legitimize_mnt(struct vfsmount *, unsigned); | |
96 | ||
97 | static inline bool __path_is_mountpoint(const struct path *path) | |
98 | { | |
99 | struct mount *m = __lookup_mnt(path->mnt, path->dentry); | |
100 | return m && likely(!(m->mnt.mnt_flags & MNT_SYNC_UMOUNT)); | |
101 | } | |
102 | ||
103 | extern void __detach_mounts(struct dentry *dentry); | |
104 | ||
105 | static inline void detach_mounts(struct dentry *dentry) | |
106 | { | |
107 | if (!d_mountpoint(dentry)) | |
108 | return; | |
109 | __detach_mounts(dentry); | |
110 | } | |
111 | ||
112 | static inline void get_mnt_ns(struct mnt_namespace *ns) | |
113 | { | |
114 | atomic_inc(&ns->count); | |
115 | } | |
116 | ||
117 | extern seqlock_t mount_lock; | |
118 | ||
119 | static inline void lock_mount_hash(void) | |
120 | { | |
121 | write_seqlock(&mount_lock); | |
122 | } | |
123 | ||
124 | static inline void unlock_mount_hash(void) | |
125 | { | |
126 | write_sequnlock(&mount_lock); | |
127 | } | |
128 | ||
129 | struct proc_mounts { | |
130 | struct mnt_namespace *ns; | |
131 | struct path root; | |
132 | int (*show)(struct seq_file *, struct vfsmount *); | |
133 | void *cached_mount; | |
134 | u64 cached_event; | |
135 | loff_t cached_index; | |
136 | }; | |
137 | ||
138 | extern const struct seq_operations mounts_op; | |
139 | ||
140 | extern bool __is_local_mountpoint(struct dentry *dentry); | |
141 | static inline bool is_local_mountpoint(struct dentry *dentry) | |
142 | { | |
143 | if (!d_mountpoint(dentry)) | |
144 | return false; | |
145 | ||
146 | return __is_local_mountpoint(dentry); | |
147 | } |