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  3. [libvirt] [PATCH 0/4] qemu: Allow concurrent access to monitor and guest agent
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[libvirt] [PATCH 4/4] qemu: Switch code to use new agent job APIs

Michal Privoznik posted 4 patches 6 years, 11 months ago
There is a newer version of this series
[libvirt] [PATCH 4/4] qemu: Switch code to use new agent job APIs
Posted by Michal Privoznik 6 years, 11 months ago 
There are two sets of functions here:
1) some functions talk on both monitor and agent monitor,
2) some functions only talk on agent monitor.

For functions from set 1) we need to use
qemuDomainObjBeginJobWithAgent() and for functions from set 2) we
need to use qemuDomainObjBeginAgentJob() only.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
---
 src/qemu/qemu_driver.c | 91 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 58 insertions(+), 33 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 28769878cc..bc1368386b 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -1956,6 +1956,7 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
     bool useAgent = false, agentRequested, acpiRequested;
     bool isReboot = false;
     bool agentForced;
+    bool agentJob = false;
     int agentFlag = QEMU_AGENT_SHUTDOWN_POWERDOWN;
 
     virCheckFlags(VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN |
@@ -1982,9 +1983,14 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
     if (virDomainShutdownFlagsEnsureACL(dom->conn, vm->def, flags) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if ((!useAgent && qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) ||
+        (useAgent && qemuDomainObjBeginJobWithAgent(driver, vm,
+                                                    QEMU_JOB_MODIFY,
+                                                    QEMU_AGENT_JOB_MODIFY) < 0))
         goto cleanup;
 
+    agentJob = useAgent;
+
     if (virDomainObjGetState(vm, NULL) != VIR_DOMAIN_RUNNING) {
         virReportError(VIR_ERR_OPERATION_INVALID,
                        "%s", _("domain is not running"));
@@ -2028,7 +2034,10 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
     }
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    if (agentJob)
+        qemuDomainObjEndJobWithAgent(driver, vm);
+    else
+        qemuDomainObjEndJob(driver, vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -2051,6 +2060,7 @@ qemuDomainReboot(virDomainPtr dom, unsigned int flags)
     bool useAgent = false, agentRequested, acpiRequested;
     bool isReboot = true;
     bool agentForced;
+    bool agentJob = false;
     int agentFlag = QEMU_AGENT_SHUTDOWN_REBOOT;
 
     virCheckFlags(VIR_DOMAIN_REBOOT_ACPI_POWER_BTN |
@@ -2077,9 +2087,14 @@ qemuDomainReboot(virDomainPtr dom, unsigned int flags)
     if (virDomainRebootEnsureACL(dom->conn, vm->def, flags) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if ((!useAgent && qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) ||
+        (useAgent && qemuDomainObjBeginJobWithAgent(driver, vm,
+                                                    QEMU_JOB_MODIFY,
+                                                    QEMU_AGENT_JOB_MODIFY) < 0))
         goto cleanup;
 
+    agentJob = useAgent;
+
     agentForced = agentRequested && !acpiRequested;
     if (!qemuDomainAgentAvailable(vm, agentForced)) {
         if (agentForced)
@@ -2117,7 +2132,10 @@ qemuDomainReboot(virDomainPtr dom, unsigned int flags)
     }
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    if (agentJob)
+        qemuDomainObjEndJobWithAgent(driver, vm);
+    else
+        qemuDomainObjEndJob(driver, vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -4951,6 +4969,7 @@ qemuDomainSetVcpusFlags(virDomainPtr dom,
     virDomainDefPtr def;
     virDomainDefPtr persistentDef;
     bool hotpluggable = !!(flags & VIR_DOMAIN_VCPU_HOTPLUGGABLE);
+    bool useAgent = !!(flags & VIR_DOMAIN_VCPU_GUEST);
     int ret = -1;
 
     virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
@@ -4965,13 +4984,14 @@ qemuDomainSetVcpusFlags(virDomainPtr dom,
     if (virDomainSetVcpusFlagsEnsureACL(dom->conn, vm->def, flags) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if ((!useAgent && qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) ||
+        (useAgent && qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0))
         goto cleanup;
 
     if (virDomainObjGetDefs(vm, flags, &def, &persistentDef) < 0)
         goto endjob;
 
-    if (flags & VIR_DOMAIN_VCPU_GUEST)
+    if (useAgent)
         ret = qemuDomainSetVcpusAgent(vm, nvcpus);
     else if (flags & VIR_DOMAIN_VCPU_MAXIMUM)
         ret = qemuDomainSetVcpusMax(driver, def, persistentDef, nvcpus);
@@ -4980,7 +5000,10 @@ qemuDomainSetVcpusFlags(virDomainPtr dom,
                                          nvcpus, hotpluggable);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    if (useAgent)
+        qemuDomainObjEndAgentJob(vm);
+    else
+        qemuDomainObjEndJob(driver, vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -5431,7 +5454,7 @@ qemuDomainGetVcpusFlags(virDomainPtr dom, unsigned int flags)
         goto cleanup;
 
     if (flags & VIR_DOMAIN_VCPU_GUEST) {
-        if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
+        if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_QUERY) < 0)
             goto cleanup;
 
         if (!virDomainObjIsActive(vm)) {
@@ -5449,7 +5472,7 @@ qemuDomainGetVcpusFlags(virDomainPtr dom, unsigned int flags)
         qemuDomainObjExitAgent(vm, agent);
 
  endjob:
-        qemuDomainObjEndJob(driver, vm);
+        qemuDomainObjEndAgentJob(vm);
 
         if (ncpuinfo < 0)
             goto cleanup;
@@ -18961,7 +18984,7 @@ qemuDomainPMSuspendForDuration(virDomainPtr dom,
     if (virDomainPMSuspendForDurationEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -18992,7 +19015,7 @@ qemuDomainPMSuspendForDuration(virDomainPtr dom,
     qemuDomainObjExitAgent(vm, agent);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -19077,7 +19100,7 @@ qemuDomainQemuAgentCommand(virDomainPtr domain,
     if (virDomainQemuAgentCommandEnsureACL(domain->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -19095,7 +19118,7 @@ qemuDomainQemuAgentCommand(virDomainPtr domain,
         VIR_FREE(result);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -19177,7 +19200,7 @@ qemuDomainFSTrim(virDomainPtr dom,
     if (virDomainFSTrimEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (!qemuDomainAgentAvailable(vm, true))
@@ -19191,7 +19214,7 @@ qemuDomainFSTrim(virDomainPtr dom,
     qemuDomainObjExitAgent(vm, agent);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -19359,7 +19382,7 @@ qemuDomainGetTime(virDomainPtr dom,
     if (virDomainGetTimeEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_QUERY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -19378,7 +19401,7 @@ qemuDomainGetTime(virDomainPtr dom,
     ret = 0;
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -19409,7 +19432,9 @@ qemuDomainSetTime(virDomainPtr dom,
 
     priv = vm->privateData;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginJobWithAgent(driver, vm,
+                                       QEMU_JOB_MODIFY,
+                                       QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -19454,7 +19479,7 @@ qemuDomainSetTime(virDomainPtr dom,
     ret = 0;
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndJobWithAgent(driver, vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -19480,7 +19505,7 @@ qemuDomainFSFreeze(virDomainPtr dom,
     if (virDomainFSFreezeEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -19489,7 +19514,7 @@ qemuDomainFSFreeze(virDomainPtr dom,
     ret = qemuDomainSnapshotFSFreeze(driver, vm, mountpoints, nmountpoints);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -19521,7 +19546,7 @@ qemuDomainFSThaw(virDomainPtr dom,
     if (virDomainFSThawEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -19530,7 +19555,7 @@ qemuDomainFSThaw(virDomainPtr dom,
     ret = qemuDomainSnapshotFSThaw(driver, vm, true);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -20545,7 +20570,7 @@ qemuDomainGetFSInfo(virDomainPtr dom,
     if (virDomainGetFSInfoEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_QUERY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -20565,7 +20590,7 @@ qemuDomainGetFSInfo(virDomainPtr dom,
     qemuDomainObjExitAgent(vm, agent);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -20602,7 +20627,7 @@ qemuDomainInterfaceAddresses(virDomainPtr dom,
         break;
 
     case VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_AGENT:
-        if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_QUERY) < 0)
+        if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_QUERY) < 0)
             goto cleanup;
 
         if (!qemuDomainAgentAvailable(vm, true))
@@ -20613,7 +20638,7 @@ qemuDomainInterfaceAddresses(virDomainPtr dom,
         qemuDomainObjExitAgent(vm, agent);
 
     endjob:
-        qemuDomainObjEndJob(driver, vm);
+        qemuDomainObjEndAgentJob(vm);
 
         break;
 
@@ -20814,7 +20839,7 @@ qemuDomainSetUserPassword(virDomainPtr dom,
     if (virDomainSetUserPasswordEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (virDomainObjCheckActive(vm) < 0)
@@ -20834,7 +20859,7 @@ qemuDomainSetUserPassword(virDomainPtr dom,
     ret = 0;
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     virDomainObjEndAPI(&vm);
@@ -21075,7 +21100,7 @@ qemuDomainGetGuestVcpus(virDomainPtr dom,
     if (virDomainGetGuestVcpusEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_QUERY) < 0)
         goto cleanup;
 
     if (!qemuDomainAgentAvailable(vm, true))
@@ -21094,7 +21119,7 @@ qemuDomainGetGuestVcpus(virDomainPtr dom,
     ret = 0;
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     VIR_FREE(info);
@@ -21134,7 +21159,7 @@ qemuDomainSetGuestVcpus(virDomainPtr dom,
     if (virDomainSetGuestVcpusEnsureACL(dom->conn, vm->def) < 0)
         goto cleanup;
 
-    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+    if (qemuDomainObjBeginAgentJob(driver, vm, QEMU_AGENT_JOB_MODIFY) < 0)
         goto cleanup;
 
     if (!qemuDomainAgentAvailable(vm, true))
@@ -21180,7 +21205,7 @@ qemuDomainSetGuestVcpus(virDomainPtr dom,
     qemuDomainObjExitAgent(vm, agent);
 
  endjob:
-    qemuDomainObjEndJob(driver, vm);
+    qemuDomainObjEndAgentJob(vm);
 
  cleanup:
     VIR_FREE(info);
-- 
2.16.4

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Re: [libvirt] [PATCH 4/4] qemu: Switch code to use new agent job APIs
Posted by John Ferlan 6 years, 11 months ago 

On 06/08/2018 09:45 AM, Michal Privoznik wrote:
> There are two sets of functions here:
> 1) some functions talk on both monitor and agent monitor,
> 2) some functions only talk on agent monitor.
> 
> For functions from set 1) we need to use
> qemuDomainObjBeginJobWithAgent() and for functions from set 2) we
> need to use qemuDomainObjBeginAgentJob() only.
> 

It seems to me the category for (1) is more - some code makes the
decision whether to use agent or normal code after the point at which we
take the lock so we need to block not only agent, but also normal jobs.


> Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
> ---
>  src/qemu/qemu_driver.c | 91 ++++++++++++++++++++++++++++++++------------------
>  1 file changed, 58 insertions(+), 33 deletions(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 28769878cc..bc1368386b 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -1956,6 +1956,7 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
>      bool useAgent = false, agentRequested, acpiRequested;
>      bool isReboot = false;
>      bool agentForced;
> +    bool agentJob = false;
>      int agentFlag = QEMU_AGENT_SHUTDOWN_POWERDOWN;
>  
>      virCheckFlags(VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN |
> @@ -1982,9 +1983,14 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
>      if (virDomainShutdownFlagsEnsureACL(dom->conn, vm->def, flags) < 0)
>          goto cleanup;
>  
> -    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
> +    if ((!useAgent && qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) ||
> +        (useAgent && qemuDomainObjBeginJobWithAgent(driver, vm,
> +                                                    QEMU_JOB_MODIFY,
> +                                                    QEMU_AGENT_JOB_MODIFY) < 0))

I think if you change qemuDomainObjBeginAgentJob to use MODIFY_BLOCK,
then this just becomes a single call...

>          goto cleanup;
>  
> +    agentJob = useAgent;
> +
>      if (virDomainObjGetState(vm, NULL) != VIR_DOMAIN_RUNNING) {
>          virReportError(VIR_ERR_OPERATION_INVALID,
>                         "%s", _("domain is not running"));
> @@ -2028,7 +2034,10 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
>      }
>  
>   endjob:
> -    qemuDomainObjEndJob(driver, vm);
> +    if (agentJob)
> +        qemuDomainObjEndJobWithAgent(driver, vm);
> +    else
> +        qemuDomainObjEndJob(driver, vm);

... and this can be a single EndAgentJob... Given that the existing
EndJobWithAgent does what EndJob does - is there reason to worry about
calling EndJob at all if EndJobWithAgent is called (or whatever that
code becomes).


There'd be similar comments for each JobWithAgent. The consumers of just
the agentJob seem to be fine... it's this combined one that looks odd.

John

[...]

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Re: [libvirt] [PATCH 4/4] qemu: Switch code to use new agent job APIs
Posted by Michal Privoznik 6 years, 11 months ago 
On 06/14/2018 12:14 AM, John Ferlan wrote:
> 
> 
> On 06/08/2018 09:45 AM, Michal Privoznik wrote:
>> There are two sets of functions here:
>> 1) some functions talk on both monitor and agent monitor,
>> 2) some functions only talk on agent monitor.
>>
>> For functions from set 1) we need to use
>> qemuDomainObjBeginJobWithAgent() and for functions from set 2) we
>> need to use qemuDomainObjBeginAgentJob() only.
>>
> 
> It seems to me the category for (1) is more - some code makes the
> decision whether to use agent or normal code after the point at which we
> take the lock so we need to block not only agent, but also normal jobs.
> 
> 
>> Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
>> ---
>>  src/qemu/qemu_driver.c | 91 ++++++++++++++++++++++++++++++++------------------
>>  1 file changed, 58 insertions(+), 33 deletions(-)
>>
>> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
>> index 28769878cc..bc1368386b 100644
>> --- a/src/qemu/qemu_driver.c
>> +++ b/src/qemu/qemu_driver.c
>> @@ -1956,6 +1956,7 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
>>      bool useAgent = false, agentRequested, acpiRequested;
>>      bool isReboot = false;
>>      bool agentForced;
>> +    bool agentJob = false;
>>      int agentFlag = QEMU_AGENT_SHUTDOWN_POWERDOWN;
>>  
>>      virCheckFlags(VIR_DOMAIN_SHUTDOWN_ACPI_POWER_BTN |
>> @@ -1982,9 +1983,14 @@ static int qemuDomainShutdownFlags(virDomainPtr dom, unsigned int flags)
>>      if (virDomainShutdownFlagsEnsureACL(dom->conn, vm->def, flags) < 0)
>>          goto cleanup;
>>  
>> -    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
>> +    if ((!useAgent && qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) ||
>> +        (useAgent && qemuDomainObjBeginJobWithAgent(driver, vm,
>> +                                                    QEMU_JOB_MODIFY,
>> +                                                    QEMU_AGENT_JOB_MODIFY) < 0))
> 
> I think if you change qemuDomainObjBeginAgentJob to use MODIFY_BLOCK,
> then this just becomes a single call...

As ugly as my proposal looks like I think it is still better than hiding
taking of both jobs behind one value of qemuDomainJob while the rest of
them don't do that.

Michal

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