Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#include <linux/mount.h>
2#include <linux/seq_file.h>
3#include <linux/poll.h>
4
5struct 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
16struct mnt_pcp {
17 int mnt_count;
18 int mnt_writers;
19};
20
21struct mountpoint {
22 struct list_head m_hash;
23 struct dentry *m_dentry;
24 int m_count;
25};
26
27struct 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
64static inline struct mount *real_mount(struct vfsmount *mnt)
65{
66 return container_of(mnt, struct mount, mnt);
67}
68
69static inline int mnt_has_parent(struct mount *mnt)
70{
71 return mnt != mnt->mnt_parent;
72}
73
74static inline int is_mounted(struct vfsmount *mnt)
75{
76 /* neither detached nor internal? */
77 return !IS_ERR_OR_NULL(real_mount(mnt));
78}
79
80extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
81extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
82
83extern bool legitimize_mnt(struct vfsmount *, unsigned);
84
85static inline void get_mnt_ns(struct mnt_namespace *ns)
86{
87 atomic_inc(&ns->count);
88}
89
90extern seqlock_t mount_lock;
91
92static inline void lock_mount_hash(void)
93{
94 write_seqlock(&mount_lock);
95}
96
97static inline void unlock_mount_hash(void)
98{
99 write_sequnlock(&mount_lock);
100}
101
102struct 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
111extern const struct seq_operations mounts_op;