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Commit | Line | Data |
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b2dba1af | 1 | #include <linux/mount.h> |
0226f492 AV |
2 | #include <linux/seq_file.h> |
3 | #include <linux/poll.h> | |
435d5f4b | 4 | #include <linux/ns_common.h> |
87b95ce0 | 5 | #include <linux/fs_pin.h> |
0226f492 AV |
6 | |
7 | struct mnt_namespace { | |
8 | atomic_t count; | |
435d5f4b | 9 | struct ns_common ns; |
be08d6d2 | 10 | struct mount * root; |
0226f492 | 11 | struct list_head list; |
771b1371 | 12 | struct user_namespace *user_ns; |
537f7ccb | 13 | struct ucounts *ucounts; |
8823c079 | 14 | u64 seq; /* Sequence number to prevent loops */ |
0226f492 | 15 | wait_queue_head_t poll; |
c7999c36 | 16 | u64 event; |
0226f492 | 17 | }; |
b2dba1af | 18 | |
68e8a9fe AV |
19 | struct mnt_pcp { |
20 | int mnt_count; | |
21 | int mnt_writers; | |
22 | }; | |
23 | ||
84d17192 | 24 | struct mountpoint { |
0818bf27 | 25 | struct hlist_node m_hash; |
84d17192 | 26 | struct dentry *m_dentry; |
0a5eb7c8 | 27 | struct hlist_head m_list; |
84d17192 AV |
28 | int m_count; |
29 | }; | |
30 | ||
7d6fec45 | 31 | struct mount { |
38129a13 | 32 | struct hlist_node mnt_hash; |
0714a533 | 33 | struct mount *mnt_parent; |
a73324da | 34 | struct dentry *mnt_mountpoint; |
7d6fec45 | 35 | struct vfsmount mnt; |
9ea459e1 AV |
36 | union { |
37 | struct rcu_head mnt_rcu; | |
38 | struct llist_node mnt_llist; | |
39 | }; | |
68e8a9fe AV |
40 | #ifdef CONFIG_SMP |
41 | struct mnt_pcp __percpu *mnt_pcp; | |
68e8a9fe AV |
42 | #else |
43 | int mnt_count; | |
44 | int mnt_writers; | |
45 | #endif | |
6b41d536 AV |
46 | struct list_head mnt_mounts; /* list of children, anchored here */ |
47 | struct list_head mnt_child; /* and going through their mnt_child */ | |
39f7c4db | 48 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ |
52ba1621 | 49 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
1a4eeaf2 | 50 | struct list_head mnt_list; |
6776db3d AV |
51 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
52 | struct list_head mnt_share; /* circular list of shared mounts */ | |
53 | struct list_head mnt_slave_list;/* list of slave mounts */ | |
54 | struct list_head mnt_slave; /* slave list entry */ | |
32301920 | 55 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ |
143c8c91 | 56 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
84d17192 | 57 | struct mountpoint *mnt_mp; /* where is it mounted */ |
0a5eb7c8 | 58 | struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */ |
c63181e6 AV |
59 | #ifdef CONFIG_FSNOTIFY |
60 | struct hlist_head mnt_fsnotify_marks; | |
61 | __u32 mnt_fsnotify_mask; | |
62 | #endif | |
15169fe7 AV |
63 | int mnt_id; /* mount identifier */ |
64 | int mnt_group_id; /* peer group identifier */ | |
863d684f | 65 | int mnt_expiry_mark; /* true if marked for expiry */ |
215752fc | 66 | struct hlist_head mnt_pins; |
87b95ce0 AV |
67 | struct fs_pin mnt_umount; |
68 | struct dentry *mnt_ex_mountpoint; | |
7d6fec45 AV |
69 | }; |
70 | ||
f7a99c5b AV |
71 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ |
72 | ||
7d6fec45 AV |
73 | static inline struct mount *real_mount(struct vfsmount *mnt) |
74 | { | |
75 | return container_of(mnt, struct mount, mnt); | |
76 | } | |
77 | ||
676da58d | 78 | static inline int mnt_has_parent(struct mount *mnt) |
b2dba1af | 79 | { |
0714a533 | 80 | return mnt != mnt->mnt_parent; |
b2dba1af | 81 | } |
c7105365 | 82 | |
f7a99c5b AV |
83 | static inline int is_mounted(struct vfsmount *mnt) |
84 | { | |
85 | /* neither detached nor internal? */ | |
260a459d | 86 | return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); |
f7a99c5b AV |
87 | } |
88 | ||
474279dc AV |
89 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); |
90 | extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); | |
0226f492 | 91 | |
294d71ff | 92 | extern int __legitimize_mnt(struct vfsmount *, unsigned); |
48a066e7 AV |
93 | extern bool legitimize_mnt(struct vfsmount *, unsigned); |
94 | ||
80b5dce8 EB |
95 | extern void __detach_mounts(struct dentry *dentry); |
96 | ||
97 | static inline void detach_mounts(struct dentry *dentry) | |
98 | { | |
99 | if (!d_mountpoint(dentry)) | |
100 | return; | |
101 | __detach_mounts(dentry); | |
102 | } | |
103 | ||
0226f492 AV |
104 | static inline void get_mnt_ns(struct mnt_namespace *ns) |
105 | { | |
106 | atomic_inc(&ns->count); | |
107 | } | |
108 | ||
48a066e7 | 109 | extern seqlock_t mount_lock; |
719ea2fb AV |
110 | |
111 | static inline void lock_mount_hash(void) | |
112 | { | |
48a066e7 | 113 | write_seqlock(&mount_lock); |
719ea2fb AV |
114 | } |
115 | ||
116 | static inline void unlock_mount_hash(void) | |
117 | { | |
48a066e7 | 118 | write_sequnlock(&mount_lock); |
719ea2fb AV |
119 | } |
120 | ||
0226f492 | 121 | struct proc_mounts { |
0226f492 AV |
122 | struct mnt_namespace *ns; |
123 | struct path root; | |
124 | int (*show)(struct seq_file *, struct vfsmount *); | |
c7999c36 AV |
125 | void *cached_mount; |
126 | u64 cached_event; | |
127 | loff_t cached_index; | |
0226f492 AV |
128 | }; |
129 | ||
130 | extern const struct seq_operations mounts_op; | |
7af1364f EB |
131 | |
132 | extern bool __is_local_mountpoint(struct dentry *dentry); | |
133 | static inline bool is_local_mountpoint(struct dentry *dentry) | |
134 | { | |
135 | if (!d_mountpoint(dentry)) | |
136 | return false; | |
137 | ||
138 | return __is_local_mountpoint(dentry); | |
139 | } |