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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
use crate::disk::inode::Inode;
pub trait Block: Default + Clone {}
#[derive(Clone)]
pub struct DataBlock(pub(crate) [u8; 4096]);
impl Default for DataBlock {
fn default() -> Self {
Self([0; 4096])
}
}
impl Block for DataBlock {}
#[derive(Clone)]
pub struct InodeBlock {
pub(crate) inodes: [Inode; 16],
}
impl Default for InodeBlock {
fn default() -> Self {
Self {
inodes: [
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
Inode::empty(),
],
}
}
}
impl Block for InodeBlock {}
const FULL_MAP: u32 = 0b111_111_111_111_111;
#[derive(Clone)]
pub struct DirectoryBlock {
entries: [[u8; 256]; 15],
inode_ids: [usize; 15],
occupancy_map: u32,
reserved: [u8; 132],
}
impl Default for DirectoryBlock {
fn default() -> Self {
Self {
entries: [[0; 256]; 15],
inode_ids: [0; 15],
occupancy_map: 0,
reserved: [0xFF; 132],
}
}
}
impl Block for DirectoryBlock {}
impl DirectoryBlock {
fn vacant(&self) -> bool {
self.occupancy_map & FULL_MAP != FULL_MAP
}
fn first_free(&self) -> Option<usize> {
todo!()
}
fn mark_busy(&mut self, entry_id: usize) {
todo!()
}
/// 需要判断 entry_name.len() <= 255
pub fn write_entry(&mut self, entry_name: &[u8], entry_inode_id: usize) -> Option<usize> {
if let Some(entry_id) = self.first_free() {
self.mark_busy(entry_id);
self.entries[entry_id].copy_from_slice(entry_name);
self.inode_ids[entry_id] = entry_inode_id;
Some(entry_id)
} else {
None
}
}
}
#[derive(Clone)]
pub struct IndirectBlock {
pub entries: [u32; 1024],
}
impl Default for IndirectBlock {
fn default() -> Self {
Self { entries: [0; 1024] }
}
}
impl Block for IndirectBlock {}
impl IndirectBlock {
pub fn full(&self) -> bool {
todo!()
}
pub fn allocate(&mut self) -> Option<usize> {
todo!()
}
}
#[derive(Clone)]
pub struct DoubleIndirectBlock {
pub indirect: [u32; 1024],
}
impl Default for DoubleIndirectBlock {
fn default() -> Self {
Self {
indirect: [0; 1024],
}
}
}
impl Block for DoubleIndirectBlock {}
impl DoubleIndirectBlock {
pub fn full(&self) -> bool {
todo!()
}
pub fn allocate(&mut self) -> Option<usize> {
todo!()
}
}
#[derive(Clone)]
pub struct TripleIndirectBlock {
pub double_indirect: [u32; 1024],
}
impl Default for TripleIndirectBlock {
fn default() -> Self {
Self {
double_indirect: [0; 1024],
}
}
}
impl Block for TripleIndirectBlock {}
impl TripleIndirectBlock {
pub fn full(&self) -> bool {
todo!()
}
pub fn allocate(&mut self) -> Option<usize> {
todo!()
}
}
|
