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1 | #include <linux/mount.h> | |
2 | #include <linux/seq_file.h> | |
3 | #include <linux/poll.h> | |
4 | ||
5 | struct mnt_namespace { | |
6 | atomic_t count; | |
7 | unsigned int proc_inum; | |
8 | struct mount * root; | |
9 | struct list_head list; | |
10 | struct user_namespace *user_ns; | |
11 | u64 seq; /* Sequence number to prevent loops */ | |
12 | wait_queue_head_t poll; | |
13 | int event; | |
14 | }; | |
15 | ||
16 | struct mnt_pcp { | |
17 | int mnt_count; | |
18 | int mnt_writers; | |
19 | }; | |
20 | ||
21 | struct mountpoint { | |
22 | struct list_head m_hash; | |
23 | struct dentry *m_dentry; | |
24 | int m_count; | |
25 | }; | |
26 | ||
27 | struct mount { | |
28 | struct list_head mnt_hash; | |
29 | struct mount *mnt_parent; | |
30 | struct dentry *mnt_mountpoint; | |
31 | struct vfsmount mnt; | |
32 | struct rcu_head mnt_rcu; | |
33 | #ifdef CONFIG_SMP | |
34 | struct mnt_pcp __percpu *mnt_pcp; | |
35 | #else | |
36 | int mnt_count; | |
37 | int mnt_writers; | |
38 | #endif | |
39 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
40 | struct list_head mnt_child; /* and going through their mnt_child */ | |
41 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ | |
42 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ | |
43 | struct list_head mnt_list; | |
44 | struct list_head mnt_expire; /* link in fs-specific expiry list */ | |
45 | struct list_head mnt_share; /* circular list of shared mounts */ | |
46 | struct list_head mnt_slave_list;/* list of slave mounts */ | |
47 | struct list_head mnt_slave; /* slave list entry */ | |
48 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ | |
49 | struct mnt_namespace *mnt_ns; /* containing namespace */ | |
50 | struct mountpoint *mnt_mp; /* where is it mounted */ | |
51 | #ifdef CONFIG_FSNOTIFY | |
52 | struct hlist_head mnt_fsnotify_marks; | |
53 | __u32 mnt_fsnotify_mask; | |
54 | #endif | |
55 | int mnt_id; /* mount identifier */ | |
56 | int mnt_group_id; /* peer group identifier */ | |
57 | int mnt_expiry_mark; /* true if marked for expiry */ | |
58 | int mnt_pinned; | |
59 | struct path mnt_ex_mountpoint; | |
60 | }; | |
61 | ||
62 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ | |
63 | ||
64 | static inline struct mount *real_mount(struct vfsmount *mnt) | |
65 | { | |
66 | return container_of(mnt, struct mount, mnt); | |
67 | } | |
68 | ||
69 | static inline int mnt_has_parent(struct mount *mnt) | |
70 | { | |
71 | return mnt != mnt->mnt_parent; | |
72 | } | |
73 | ||
74 | static inline int is_mounted(struct vfsmount *mnt) | |
75 | { | |
76 | /* neither detached nor internal? */ | |
77 | return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); | |
78 | } | |
79 | ||
80 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); | |
81 | extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); | |
82 | ||
83 | extern bool legitimize_mnt(struct vfsmount *, unsigned); | |
84 | ||
85 | static inline void get_mnt_ns(struct mnt_namespace *ns) | |
86 | { | |
87 | atomic_inc(&ns->count); | |
88 | } | |
89 | ||
90 | extern seqlock_t mount_lock; | |
91 | ||
92 | static inline void lock_mount_hash(void) | |
93 | { | |
94 | write_seqlock(&mount_lock); | |
95 | } | |
96 | ||
97 | static inline void unlock_mount_hash(void) | |
98 | { | |
99 | write_sequnlock(&mount_lock); | |
100 | } | |
101 | ||
102 | struct proc_mounts { | |
103 | struct seq_file m; | |
104 | struct mnt_namespace *ns; | |
105 | struct path root; | |
106 | int (*show)(struct seq_file *, struct vfsmount *); | |
107 | }; | |
108 | ||
109 | #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) | |
110 | ||
111 | extern const struct seq_operations mounts_op; |