1wrote 4096/4096 bytes at offset 0 24 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 3 4=== Launch VM === 5{"execute": "nbd-server-start", "arguments": {"addr": {"data": {"path": "SOCK_DIR/PID-socket"}, "type": "unix"}}} 6{"return": {}} 7{"execute": "query-block-exports", "arguments": {}} 8{"return": []} 9 10=== Create a read-only NBD export === 11{"execute": "block-export-add", "arguments": {"id": "export0", "node-name": "fmt", "type": "nbd"}} 12{"return": {}} 13{"execute": "query-block-exports", "arguments": {}} 14{"return": [{"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]} 15exports available: 1 16 export: 'fmt' 17 size: 67108864 18 flags: 0x58f ( readonly flush fua df multi cache ) 19 min block: XXX 20 opt block: XXX 21 max block: XXX 22 available meta contexts: 1 23 base:allocation 24 25 26=== Try a few invalid things === 27{"execute": "block-export-add", "arguments": {"id": "#invalid", "node-name": "fmt", "type": "nbd"}} 28{"error": {"class": "GenericError", "desc": "Invalid block export id"}} 29{"execute": "block-export-add", "arguments": {"id": "export0", "node-name": "fmt", "type": "nbd"}} 30{"error": {"class": "GenericError", "desc": "Block export id 'export0' is already in use"}} 31{"execute": "block-export-add", "arguments": {"id": "export1", "node-name": "ro", "type": "nbd", "writable": true}} 32{"error": {"class": "GenericError", "desc": "Cannot export read-only node as writable"}} 33{"execute": "block-export-del", "arguments": {"id": "export1"}} 34{"error": {"class": "GenericError", "desc": "Export 'export1' is not found"}} 35{"execute": "query-block-exports", "arguments": {}} 36{"return": [{"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]} 37 38=== Move export to an iothread === 39{"execute": "device_add", "arguments": {"drive": "fmt", "driver": "scsi-hd", "id": "sda"}} 40{"return": {}} 41{"execute": "query-block-exports", "arguments": {}} 42{"return": [{"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]} 43exports available: 1 44 export: 'fmt' 45 size: 67108864 46 flags: 0x58f ( readonly flush fua df multi cache ) 47 min block: XXX 48 opt block: XXX 49 max block: XXX 50 available meta contexts: 1 51 base:allocation 52 53 54=== Add a writable export === 55{"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}} 56{"error": {"class": "GenericError", "desc": "Conflicts with use by sda as 'root', which does not allow 'write' on fmt"}} 57{"execute": "device_del", "arguments": {"id": "sda"}} 58{"return": {}} 59{"data": {"device": "sda", "path": "/machine/peripheral/sda"}, "event": "DEVICE_DELETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}} 60{"execute": "device_add", "arguments": {"drive": "fmt", "driver": "scsi-hd", "id": "sda", "share-rw": true}} 61{"return": {}} 62{"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}} 63{"return": {}} 64{"execute": "query-block-exports", "arguments": {}} 65{"return": [{"id": "export1", "node-name": "fmt", "shutting-down": false, "type": "nbd"}, {"id": "export0", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]} 66exports available: 2 67 export: 'fmt' 68 size: 67108864 69 flags: 0x58f ( readonly flush fua df multi cache ) 70 min block: XXX 71 opt block: XXX 72 max block: XXX 73 available meta contexts: 1 74 base:allocation 75 export: 'export1' 76 description: This is the writable second export 77 size: 67108864 78 flags: 0xced ( flush fua trim zeroes df cache fast-zero ) 79 min block: XXX 80 opt block: XXX 81 max block: XXX 82 available meta contexts: 1 83 base:allocation 84 85 86=== Connect qemu-io to export1, try removing exports === 87read 4096/4096 bytes at offset 0 884 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 89 90wrote 4096/4096 bytes at offset 4096 914 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 92 93{"execute": "block-export-del", "arguments": {"id": "export1"}} 94{"error": {"class": "GenericError", "desc": "export 'export1' still in use"}} 95{"execute": "block-export-del", "arguments": {"id": "export0"}} 96{"return": {}} 97[{"data": {"id": "export0"}, "event": "BLOCK_EXPORT_DELETED", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}] 98{"execute": "query-block-exports", "arguments": {}} 99{"return": [{"id": "export1", "node-name": "fmt", "shutting-down": false, "type": "nbd"}]} 100exports available: 1 101 export: 'export1' 102 description: This is the writable second export 103 size: 67108864 104 flags: 0xced ( flush fua trim zeroes df cache fast-zero ) 105 min block: XXX 106 opt block: XXX 107 max block: XXX 108 available meta contexts: 1 109 base:allocation 110 111 112=== Connect qemu-io again, try force removing === 113{"execute": "block-export-del", "arguments": {"id": "export1"}} 114{"error": {"class": "GenericError", "desc": "export 'export1' still in use"}} 115{"execute": "block-export-del", "arguments": {"id": "export1", "mode": "hard"}} 116{"return": {}} 117read failed: Input/output error 118 119{"execute": "query-block-exports", "arguments": {}} 120{"return": []} 121exports available: 0 122 123 124=== Shut down QEMU === 125