Commit | Line | Data |
---|---|---|
b2dba1af | 1 | #include <linux/mount.h> |
0226f492 AV |
2 | #include <linux/seq_file.h> |
3 | #include <linux/poll.h> | |
4 | ||
5 | struct mnt_namespace { | |
6 | atomic_t count; | |
98f842e6 | 7 | unsigned int proc_inum; |
be08d6d2 | 8 | struct mount * root; |
0226f492 | 9 | struct list_head list; |
771b1371 | 10 | struct user_namespace *user_ns; |
8823c079 | 11 | u64 seq; /* Sequence number to prevent loops */ |
0226f492 AV |
12 | wait_queue_head_t poll; |
13 | int event; | |
14 | }; | |
b2dba1af | 15 | |
68e8a9fe AV |
16 | struct mnt_pcp { |
17 | int mnt_count; | |
18 | int mnt_writers; | |
19 | }; | |
20 | ||
84d17192 AV |
21 | struct mountpoint { |
22 | struct list_head m_hash; | |
23 | struct dentry *m_dentry; | |
24 | int m_count; | |
25 | }; | |
26 | ||
7d6fec45 | 27 | struct mount { |
1b8e5564 | 28 | struct list_head mnt_hash; |
0714a533 | 29 | struct mount *mnt_parent; |
a73324da | 30 | struct dentry *mnt_mountpoint; |
7d6fec45 | 31 | struct vfsmount mnt; |
48a066e7 | 32 | struct rcu_head mnt_rcu; |
68e8a9fe AV |
33 | #ifdef CONFIG_SMP |
34 | struct mnt_pcp __percpu *mnt_pcp; | |
68e8a9fe AV |
35 | #else |
36 | int mnt_count; | |
37 | int mnt_writers; | |
38 | #endif | |
6b41d536 AV |
39 | struct list_head mnt_mounts; /* list of children, anchored here */ |
40 | struct list_head mnt_child; /* and going through their mnt_child */ | |
39f7c4db | 41 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ |
52ba1621 | 42 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
1a4eeaf2 | 43 | struct list_head mnt_list; |
6776db3d AV |
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 */ | |
32301920 | 48 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ |
143c8c91 | 49 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
84d17192 | 50 | struct mountpoint *mnt_mp; /* where is it mounted */ |
c63181e6 AV |
51 | #ifdef CONFIG_FSNOTIFY |
52 | struct hlist_head mnt_fsnotify_marks; | |
53 | __u32 mnt_fsnotify_mask; | |
54 | #endif | |
15169fe7 AV |
55 | int mnt_id; /* mount identifier */ |
56 | int mnt_group_id; /* peer group identifier */ | |
863d684f AV |
57 | int mnt_expiry_mark; /* true if marked for expiry */ |
58 | int mnt_pinned; | |
aba809cf | 59 | struct path mnt_ex_mountpoint; |
7d6fec45 AV |
60 | }; |
61 | ||
f7a99c5b AV |
62 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ |
63 | ||
7d6fec45 AV |
64 | static inline struct mount *real_mount(struct vfsmount *mnt) |
65 | { | |
66 | return container_of(mnt, struct mount, mnt); | |
67 | } | |
68 | ||
676da58d | 69 | static inline int mnt_has_parent(struct mount *mnt) |
b2dba1af | 70 | { |
0714a533 | 71 | return mnt != mnt->mnt_parent; |
b2dba1af | 72 | } |
c7105365 | 73 | |
f7a99c5b AV |
74 | static inline int is_mounted(struct vfsmount *mnt) |
75 | { | |
76 | /* neither detached nor internal? */ | |
77 | return !IS_ERR_OR_NULL(real_mount(mnt)); | |
78 | } | |
79 | ||
474279dc AV |
80 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); |
81 | extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); | |
0226f492 | 82 | |
48a066e7 AV |
83 | extern bool legitimize_mnt(struct vfsmount *, unsigned); |
84 | ||
0226f492 AV |
85 | static inline void get_mnt_ns(struct mnt_namespace *ns) |
86 | { | |
87 | atomic_inc(&ns->count); | |
88 | } | |
89 | ||
48a066e7 | 90 | extern seqlock_t mount_lock; |
719ea2fb AV |
91 | |
92 | static inline void lock_mount_hash(void) | |
93 | { | |
48a066e7 | 94 | write_seqlock(&mount_lock); |
719ea2fb AV |
95 | } |
96 | ||
97 | static inline void unlock_mount_hash(void) | |
98 | { | |
48a066e7 | 99 | write_sequnlock(&mount_lock); |
719ea2fb AV |
100 | } |
101 | ||
0226f492 | 102 | struct proc_mounts { |
6ce6e24e | 103 | struct seq_file m; |
0226f492 AV |
104 | struct mnt_namespace *ns; |
105 | struct path root; | |
106 | int (*show)(struct seq_file *, struct vfsmount *); | |
107 | }; | |
108 | ||
6ce6e24e AV |
109 | #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) |
110 | ||
0226f492 | 111 | extern const struct seq_operations mounts_op; |