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 | 12 | wait_queue_head_t poll; |
c7999c36 | 13 | u64 event; |
0226f492 | 14 | }; |
b2dba1af | 15 | |
68e8a9fe AV |
16 | struct mnt_pcp { |
17 | int mnt_count; | |
18 | int mnt_writers; | |
19 | }; | |
20 | ||
84d17192 | 21 | struct mountpoint { |
0818bf27 | 22 | struct hlist_node m_hash; |
84d17192 AV |
23 | struct dentry *m_dentry; |
24 | int m_count; | |
25 | }; | |
26 | ||
7d6fec45 | 27 | struct mount { |
38129a13 | 28 | struct hlist_node mnt_hash; |
0714a533 | 29 | struct mount *mnt_parent; |
a73324da | 30 | struct dentry *mnt_mountpoint; |
7d6fec45 | 31 | struct vfsmount mnt; |
9ea459e1 AV |
32 | union { |
33 | struct rcu_head mnt_rcu; | |
34 | struct llist_node mnt_llist; | |
35 | }; | |
68e8a9fe AV |
36 | #ifdef CONFIG_SMP |
37 | struct mnt_pcp __percpu *mnt_pcp; | |
68e8a9fe AV |
38 | #else |
39 | int mnt_count; | |
40 | int mnt_writers; | |
41 | #endif | |
6b41d536 AV |
42 | struct list_head mnt_mounts; /* list of children, anchored here */ |
43 | struct list_head mnt_child; /* and going through their mnt_child */ | |
39f7c4db | 44 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ |
52ba1621 | 45 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
1a4eeaf2 | 46 | struct list_head mnt_list; |
6776db3d AV |
47 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
48 | struct list_head mnt_share; /* circular list of shared mounts */ | |
49 | struct list_head mnt_slave_list;/* list of slave mounts */ | |
50 | struct list_head mnt_slave; /* slave list entry */ | |
32301920 | 51 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ |
143c8c91 | 52 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
84d17192 | 53 | struct mountpoint *mnt_mp; /* where is it mounted */ |
c63181e6 AV |
54 | #ifdef CONFIG_FSNOTIFY |
55 | struct hlist_head mnt_fsnotify_marks; | |
56 | __u32 mnt_fsnotify_mask; | |
57 | #endif | |
15169fe7 AV |
58 | int mnt_id; /* mount identifier */ |
59 | int mnt_group_id; /* peer group identifier */ | |
863d684f | 60 | int mnt_expiry_mark; /* true if marked for expiry */ |
215752fc | 61 | struct hlist_head mnt_pins; |
aba809cf | 62 | struct path mnt_ex_mountpoint; |
7d6fec45 AV |
63 | }; |
64 | ||
f7a99c5b AV |
65 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ |
66 | ||
7d6fec45 AV |
67 | static inline struct mount *real_mount(struct vfsmount *mnt) |
68 | { | |
69 | return container_of(mnt, struct mount, mnt); | |
70 | } | |
71 | ||
676da58d | 72 | static inline int mnt_has_parent(struct mount *mnt) |
b2dba1af | 73 | { |
0714a533 | 74 | return mnt != mnt->mnt_parent; |
b2dba1af | 75 | } |
c7105365 | 76 | |
f7a99c5b AV |
77 | static inline int is_mounted(struct vfsmount *mnt) |
78 | { | |
79 | /* neither detached nor internal? */ | |
260a459d | 80 | return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); |
f7a99c5b AV |
81 | } |
82 | ||
474279dc AV |
83 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); |
84 | extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); | |
0226f492 | 85 | |
48a066e7 AV |
86 | extern bool legitimize_mnt(struct vfsmount *, unsigned); |
87 | ||
0226f492 AV |
88 | static inline void get_mnt_ns(struct mnt_namespace *ns) |
89 | { | |
90 | atomic_inc(&ns->count); | |
91 | } | |
92 | ||
48a066e7 | 93 | extern seqlock_t mount_lock; |
719ea2fb AV |
94 | |
95 | static inline void lock_mount_hash(void) | |
96 | { | |
48a066e7 | 97 | write_seqlock(&mount_lock); |
719ea2fb AV |
98 | } |
99 | ||
100 | static inline void unlock_mount_hash(void) | |
101 | { | |
48a066e7 | 102 | write_sequnlock(&mount_lock); |
719ea2fb AV |
103 | } |
104 | ||
0226f492 | 105 | struct proc_mounts { |
6ce6e24e | 106 | struct seq_file m; |
0226f492 AV |
107 | struct mnt_namespace *ns; |
108 | struct path root; | |
109 | int (*show)(struct seq_file *, struct vfsmount *); | |
c7999c36 AV |
110 | void *cached_mount; |
111 | u64 cached_event; | |
112 | loff_t cached_index; | |
0226f492 AV |
113 | }; |
114 | ||
6ce6e24e AV |
115 | #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) |
116 | ||
0226f492 | 117 | extern const struct seq_operations mounts_op; |