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Widening API change - accept empty path for virDomainBlockStats

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And provide domain summary stat in that case, for lxc backend.
Use case is a container inheriting all devices from the host,
e.g. when doing application containerization.
This commit is contained in:
Thorsten Behrens 2014-02-14 18:49:04 +01:00 committed by Michal Privoznik
parent dcc85c603e
commit 0bd2ccdecc
3 changed files with 17 additions and 5 deletions
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8
src/libvirt.c
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@ -7750,7 +7750,9 @@ error:
* an unambiguous source name of the block device (the <source
* file='...'/> sub-element, such as "/path/to/image"). Valid names
* can be found by calling virDomainGetXMLDesc() and inspecting
* elements within //domain/devices/disk.
* elements within //domain/devices/disk. Some drivers might also
* accept the empty string for the @disk parameter, and then yield
* summary stats for the entire domain.
*
* Domains may have more than one block device. To get stats for
* each you should make multiple calls to this function.
@ -7816,7 +7818,9 @@ error:
* an unambiguous source name of the block device (the <source
* file='...'/> sub-element, such as "/path/to/image"). Valid names
* can be found by calling virDomainGetXMLDesc() and inspecting
* elements within //domain/devices/disk.
* elements within //domain/devices/disk. Some drivers might also
* accept the empty string for the @disk parameter, and then yield
* summary stats for the entire domain.
*
* Domains may have more than one block device. To get stats for
* each you should make multiple calls to this function.

9
tools/virsh-domain-monitor.c
View File

@ -888,7 +888,7 @@ static const vshCmdOptDef opts_domblkstat[] = {
},
{.name = "device",
.type = VSH_OT_DATA,
.flags = VSH_OFLAG_REQ,
.flags = VSH_OFLAG_EMPTY_OK,
.help = N_("block device")
},
{.name = "human",
@ -954,9 +954,16 @@ cmdDomblkstat(vshControl *ctl, const vshCmd *cmd)
if (!(dom = vshCommandOptDomain(ctl, cmd, &name)))
return false;
/* device argument is optional now. if it's missing, supply empty
string to denote 'all devices'. A NULL device arg would violate
API contract.
*/
if (vshCommandOptStringReq(ctl, cmd, "device", &device) < 0)
goto cleanup;
if (!device)
device = "";
rc = virDomainBlockStatsFlags(dom, device, NULL, &nparams, 0);
/* It might fail when virDomainBlockStatsFlags is not

5
tools/virsh.pod
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@ -623,12 +623,13 @@ If I<--graceful> is specified, don't resort to extreme measures
(e.g. SIGKILL) when the guest doesn't stop after a reasonable timeout;
return an error instead.
=item B<domblkstat> I<domain> I<block-device> [I<--human>]
=item B<domblkstat> I<domain> [I<block-device>] [I<--human>]
Get device block stats for a running domain. A I<block-device> corresponds
to a unique target name (<target dev='name'/>) or source file (<source
file='name'/>) for one of the disk devices attached to I<domain> (see
also B<domblklist> for listing these names).
also B<domblklist> for listing these names). On a lxc domain, omitting the
I<block-device> yields device block stats summarily for the entire domain.
Use I<--human> for a more human readable output.