btrfs 1.2.2

Interface for BTRFS ioctls etc
Documentation 
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

use std::collections::HashMap;

use diskformat::*;

pub struct BtrfsTree {
}

impl BtrfsTree {

	/*
	pub fn read_tree <'a> (
		devices: & HashMap <u64, & 'a [u8]>,
		superblock: & BtrfsSuperblock,
		chunk_tree: & BtrfsChunkTree,
		tree_logical_address: u64,
	) -> Result <HashMap <BtrfsKey, BtrfsLeafItem <'a>>, String> {

		let mut tree_items: HashMap <BtrfsKey, BtrfsLeafItem> =
			HashMap::new ();

		Self::read_tree_recurse (
			devices,
			superblock,
			chunk_tree,
			tree_logical_address,
			& mut tree_items,
		) ?;

		Ok (tree_items)

	}
	*/

	pub fn read_tree_recurse <'a> (
		devices: & 'a BtrfsDeviceMap,
		superblock: & BtrfsSuperblock,
		chunk_tree: & BtrfsChunkTree,
		logical_address: u64,
		tree_items: & mut HashMap <BtrfsKey, BtrfsLeafItem <'a>>,
		errors: & mut Vec <String>,
	) {

		let logical_to_physical_result =
			chunk_tree.logical_to_physical_address (
				logical_address,
			);

		if logical_to_physical_result.is_none () {

			errors.push (
				format! (
					"Logical address lookup failed: 0x{:x}",
					logical_address));

			return;

		}

		let (device_id, device_address) =
			logical_to_physical_result.unwrap ();

		let device =
			devices.get (
				& device_id,
			).expect ("Lookup device");

		let node_bytes =
			device.slice_at (
				device_address as usize,
				superblock.node_size () as usize,
			);

		let node_result =
			BtrfsNode::from_bytes (
				node_bytes,
			);

		if let Err (error) = node_result {

			format! (
				"Error reading node as 0x{:x}: {}",
				logical_address,
				error);

			return;

		}

		let node =
			node_result.unwrap ();

		match node {

			BtrfsNode::Internal (internal_node) => {

				for item in internal_node.items () {

					Self::read_tree_recurse (
						devices,
						superblock,
						chunk_tree,
						item.key ().offset (),
						tree_items,
						errors,
					);

				}

			},

			BtrfsNode::Leaf (leaf_node) => {

				for item in leaf_node.items () {

					tree_items.insert (
						item.key (),
						item,
					);

				}

			},

		}

	}

}