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
|
/*
* Copyright (C) 2018 The Android Open Source Project
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __CORE_FS_MGR_DM_LINEAR_H
#define __CORE_FS_MGR_DM_LINEAR_H
#include <stdint.h>
#include <chrono>
#include <memory>
#include <optional>
#include <string>
#include <vector>
#include <libdm/dm.h>
#include <liblp/liblp.h>
namespace android {
namespace fs_mgr {
// Read metadata from the current slot.
std::unique_ptr<LpMetadata> ReadCurrentMetadata(const std::string& block_device);
// Create block devices for all logical partitions in the given metadata. The
// metadata must have been read from the current slot.
bool CreateLogicalPartitions(const LpMetadata& metadata, const std::string& block_device);
// Create block devices for all logical partitions. This is a convenience
// method for ReadMetadata and CreateLogicalPartitions.
bool CreateLogicalPartitions(const std::string& block_device);
struct CreateLogicalPartitionParams {
// Block device of the super partition.
std::string block_device;
// If |metadata| is null, the slot will be read using |metadata_slot|.
const LpMetadata* metadata = nullptr;
std::optional<uint32_t> metadata_slot;
// If |partition| is not set, it will be found via |partition_name|.
const LpMetadataPartition* partition = nullptr;
std::string partition_name;
// Force the device to be read-write even if it was specified as readonly
// in the metadata.
bool force_writable = false;
// If |timeout_ms| is non-zero, then CreateLogicalPartition will block for
// the given amount of time until the path returned in |path| is available.
std::chrono::milliseconds timeout_ms = {};
// If this is non-empty, it will override the device mapper name (by
// default the partition name will be used).
std::string device_name;
// If non-null, this will use the specified IPartitionOpener rather than
// the default one.
const IPartitionOpener* partition_opener = nullptr;
// Helpers for determining the effective partition and device name.
std::string GetPartitionName() const;
std::string GetDeviceName() const;
// Specify ownership of fields. The ownership of these fields are managed
// by the caller of InitDefaults().
// These are not declared in CreateLogicalPartitionParams so that the
// copy constructor is not deleted.
struct OwnedData {
std::unique_ptr<LpMetadata> metadata;
std::unique_ptr<IPartitionOpener> partition_opener;
};
// Fill in default values for |params| that CreateLogicalPartition assumes. Caller does
// not need to call this before calling CreateLogicalPartition; CreateLogicalPartition sets
// values when they are missing.
// Caller is responsible for destroying owned_data when |this| is not used.
bool InitDefaults(OwnedData* owned);
};
bool CreateLogicalPartition(CreateLogicalPartitionParams params, std::string* path);
// Destroy the block device for a logical partition, by name. If |timeout_ms|
// is non-zero, then this will block until the device path has been unlinked.
bool DestroyLogicalPartition(const std::string& name);
// Helper for populating a DmTable for a logical partition.
bool CreateDmTable(CreateLogicalPartitionParams params, android::dm::DmTable* table);
} // namespace fs_mgr
} // namespace android
#endif // __CORE_FS_MGR_DM_LINEAR_H
|
