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authorBenoƮt Canet <benoit@irqsave.net>2014-01-23 21:31:35 +0100
committerKevin Wolf <kwolf@redhat.com>2014-01-24 16:07:08 +0100
commit12d3ba821da9f8a039240a8a1bc01e27a12f9c22 (patch)
treef7491db69a4cf7882341682a7d08724c76af9b85 /qmp-commands.hx
parentc13163fba151f0be5176eaf55907bc1dbff3a1d4 (diff)
downloadqemu-arm-12d3ba821da9f8a039240a8a1bc01e27a12f9c22.tar.gz
qmp: Allow to change password on named block driver states.
Signed-off-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Fam Zheng <famz@redhat.com> There was two candidate ways to implement named node manipulation: 1) { 'command': 'block_passwd', 'data': {'*device': 'str', '*node-name': 'str', 'password': 'str'} } 2) { 'command': 'block_passwd', 'data': {'device': 'str', '*device-is-node': 'bool', 'password': 'str'} } Luiz proposed 1 and says 2 was an abuse of the QMP interface and proposed to rewrite the QMP block interface for 2.0. Luiz does not like in 1 the fact that 2 fields are optional but one of them must be specified leading to an abuse of the QMP semantic. Kevin argumented that 2 what a clear abuse of the device field and would not be practical when reading fast some log file because the user would read "device" and think that a device is manipulated when it's in fact a node name. Documentation of 1 make it pretty clear what to do for the user. Kevin argued that all bs are node including devices ones so 2 does not make sense. Kevin also argued that rewriting the QMP block interface would not make disapear the current one. Kevin pushed the argument that making the QAPI generator compatible with the semantic of the operation would need a rewrite that no one has done yet. A vote has been done on the list to elect the version to use and 1 won. For reference the complete thread is: "[Qemu-devel] [PATCH V4 4/7] qmp: Allow to change password on names block driver states." Signed-off-by: Benoit Canet <benoit@irqsave.net> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qmp-commands.hx')
-rw-r--r--qmp-commands.hx3
1 files changed, 2 insertions, 1 deletions
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 11b44c51b7..5492eb061b 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1503,7 +1503,7 @@ EQMP
{
.name = "block_passwd",
- .args_type = "device:B,password:s",
+ .args_type = "device:s?,node-name:s?,password:s",
.mhandler.cmd_new = qmp_marshal_input_block_passwd,
},
@@ -1516,6 +1516,7 @@ Set the password of encrypted block devices.
Arguments:
- "device": device name (json-string)
+- "node-name": name in the block driver state graph (json-string)
- "password": password (json-string)
Example: