1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
package vfs
// Entry is an element in the circular linked list.
//
// +stateify savable
type mountEntry struct {
next *mountEntry
prev *mountEntry
container *Mount
}
// Init instantiates an Element to be an item in a ring (circularly-linked
// list).
//
//go:nosplit
func (e *mountEntry) Init(container *Mount) {
e.next = e
e.prev = e
e.container = container
}
// Add adds new to old's ring.
//
//go:nosplit
func (e *mountEntry) Add(new *mountEntry) {
next := e.next
prev := e
next.prev = new
new.next = next
new.prev = prev
e.next = new
}
// Remove removes e from its ring and reinitializes it.
//
//go:nosplit
func (e *mountEntry) Remove() {
next := e.next
prev := e.prev
next.prev = prev
prev.next = next
e.Init(e.container)
}
// Empty returns true if there are no other elements in the ring.
//
//go:nosplit
func (e *mountEntry) Empty() bool {
return e.next == e
}
// Next returns the next containing object pointed to by the list.
//
//go:nosplit
func (e *mountEntry) Next() *Mount {
return e.next.container
}
// Prev returns the previous containing object pointed to by the list.
//
//go:nosplit
func (e *mountEntry) Prev() *Mount {
return e.prev.container
}
|
