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
|
wrote 4096/4096 bytes at offset 0
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Launch VM ===
{"execute": "nbd-server-start", "arguments": {"addr": {"data": {"path": "SOCK_DIR/PID-socket"}, "type": "unix"}}}
{"return": {}}
{"execute": "query-block-exports", "arguments": {}}
{"return": []}
=== Create a read-only NBD export ===
{"execute": "block-export-add", "arguments": {"id": "export0", "node-name": "fmt", "type": "nbd"}}
{"return": {}}
{"execute": "query-block-exports", "arguments": {}}
{"return": [{"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]}
exports available: 1
export: 'fmt'
size: 67108864
flags: 0x58f ( readonly flush fua df multi cache )
min block: XXX
opt block: XXX
max block: XXX
available meta contexts: 1
base:allocation
=== Try a few invalid things ===
{"execute": "block-export-add", "arguments": {"id": "#invalid", "node-name": "fmt", "type": "nbd"}}
{"error": {"class": "GenericError", "desc": "Invalid block export id"}}
{"execute": "block-export-add", "arguments": {"id": "export0", "node-name": "fmt", "type": "nbd"}}
{"error": {"class": "GenericError", "desc": "Block export id 'export0' is already in use"}}
{"execute": "block-export-add", "arguments": {"id": "export1", "node-name": "ro", "type": "nbd", "writable": true}}
{"error": {"class": "GenericError", "desc": "Cannot export read-only node as writable"}}
{"execute": "block-export-del", "arguments": {"id": "export1"}}
{"error": {"class": "GenericError", "desc": "Export 'export1' is not found"}}
{"execute": "query-block-exports", "arguments": {}}
{"return": [{"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]}
=== Move export to an iothread ===
{"execute": "device_add", "arguments": {"drive": "fmt", "driver": "scsi-hd", "id": "sda"}}
{"return": {}}
{"execute": "query-block-exports", "arguments": {}}
{"return": [{"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]}
exports available: 1
export: 'fmt'
size: 67108864
flags: 0x58f ( readonly flush fua df multi cache )
min block: XXX
opt block: XXX
max block: XXX
available meta contexts: 1
base:allocation
=== Add a writable export ===
{"execute": "block-export-add", "arguments": {"description": "This is the writable second export", "id": "export1", "name": "export1", "node-name": "fmt", "type": "nbd", "writable": true, "writethrough": true}}
{"error": {"class": "GenericError", "desc": "Permission conflict on node 'fmt': permissions 'write' are both required by an unnamed block device (uses node 'fmt' as 'root' child) and unshared by block device 'sda' (uses node 'fmt' as 'root' child)."}}
{"execute": "device_del", "arguments": {"id": "sda"}}
{"return": {}}
{"data": {"device": "sda", "path": "/machine/peripheral/sda"}, "event": "DEVICE_DELETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}
{"execute": "device_add", "arguments": {"drive": "fmt", "driver": "scsi-hd", "id": "sda", "share-rw": true}}
{"return": {}}
{"execute": "block-export-add", "arguments": {"description": "This is the writable second export", "id": "export1", "name": "export1", "node-name": "fmt", "type": "nbd", "writable": true, "writethrough": true}}
{"return": {}}
{"execute": "query-block-exports", "arguments": {}}
{"return": [{"id": "export1", "node-name": "fmt", "shutting-down": false, "type": "nbd"}, {"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]}
exports available: 2
export: 'fmt'
size: 67108864
flags: 0x58f ( readonly flush fua df multi cache )
min block: XXX
opt block: XXX
max block: XXX
available meta contexts: 1
base:allocation
export: 'export1'
description: This is the writable second export
size: 67108864
flags: 0xced ( flush fua trim zeroes df cache fast-zero )
min block: XXX
opt block: XXX
max block: XXX
available meta contexts: 1
base:allocation
=== Connect qemu-io to export1, try removing exports ===
read 4096/4096 bytes at offset 0
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 4096/4096 bytes at offset 4096
4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
{"execute": "block-export-del", "arguments": {"id": "export1"}}
{"error": {"class": "GenericError", "desc": "export 'export1' still in use"}}
{"execute": "block-export-del", "arguments": {"id": "export0"}}
{"return": {}}
[{"data": {"id": "export0"}, "event": "BLOCK_EXPORT_DELETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}]
{"execute": "query-block-exports", "arguments": {}}
{"return": [{"id": "export1", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]}
exports available: 1
export: 'export1'
description: This is the writable second export
size: 67108864
flags: 0xced ( flush fua trim zeroes df cache fast-zero )
min block: XXX
opt block: XXX
max block: XXX
available meta contexts: 1
base:allocation
=== Connect qemu-io again, try force removing ===
{"execute": "block-export-del", "arguments": {"id": "export1"}}
{"error": {"class": "GenericError", "desc": "export 'export1' still in use"}}
{"execute": "block-export-del", "arguments": {"id": "export1", "mode": "hard"}}
{"return": {}}
read failed: Input/output error
{"execute": "query-block-exports", "arguments": {}}
{"return": []}
exports available: 0
=== Shut down QEMU ===
|
