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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 | #ifdef CONFIG_SMP |
33 | struct mnt_pcp __percpu *mnt_pcp; |
34 | #else |
35 | int mnt_count; |
36 | int mnt_writers; |
37 | #endif |
38 | struct list_head mnt_mounts; /* list of children, anchored here */ |
39 | struct list_head mnt_child; /* and going through their mnt_child */ |
40 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ |
41 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
42 | struct list_head mnt_list; |
43 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
44 | struct list_head mnt_share; /* circular list of shared mounts */ |
45 | struct list_head mnt_slave_list;/* list of slave mounts */ |
46 | struct list_head mnt_slave; /* slave list entry */ |
47 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ |
48 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
49 | struct mountpoint *mnt_mp; /* where is it mounted */ |
50 | #ifdef CONFIG_FSNOTIFY |
51 | struct hlist_head mnt_fsnotify_marks; |
52 | __u32 mnt_fsnotify_mask; |
53 | #endif |
54 | int mnt_id; /* mount identifier */ |
55 | int mnt_group_id; /* peer group identifier */ |
56 | int mnt_expiry_mark; /* true if marked for expiry */ |
57 | int mnt_pinned; |
58 | int mnt_ghosts; |
59 | }; |
60 | |
61 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ |
62 | |
63 | static inline struct mount *real_mount(struct vfsmount *mnt) |
64 | { |
65 | return container_of(mnt, struct mount, mnt); |
66 | } |
67 | |
68 | static inline int mnt_has_parent(struct mount *mnt) |
69 | { |
70 | return mnt != mnt->mnt_parent; |
71 | } |
72 | |
73 | static inline int is_mounted(struct vfsmount *mnt) |
74 | { |
75 | /* neither detached nor internal? */ |
76 | return !IS_ERR_OR_NULL(real_mount(mnt)); |
77 | } |
78 | |
79 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int); |
80 | |
81 | static inline void get_mnt_ns(struct mnt_namespace *ns) |
82 | { |
83 | atomic_inc(&ns->count); |
84 | } |
85 | |
86 | struct proc_mounts { |
87 | struct seq_file m; |
88 | struct mnt_namespace *ns; |
89 | struct path root; |
90 | int (*show)(struct seq_file *, struct vfsmount *); |
91 | }; |
92 | |
93 | #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) |
94 | |
95 | extern const struct seq_operations mounts_op; |
96 |
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