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virsh: add --io when attaching disks to guests

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virt-install and virt-manager both default to explicitly setting
"io='native'" in the disk "driver" tag. virsh, however, does not and also
does not provide an option to specify that setting at all.  As a result,
disks use a different IO mechanism (the default, "threads") when attached
post-setup using virsh.  Adding this option allows users to keep disk
performance consistent for disks attached at install, and those attached
afterward.
This commit is contained in:
Gordon Messmer 2017-05-12 14:27:27 -07:00 committed by John Ferlan
parent ed61e0b368
commit ca21d75d25
2 changed files with 13 additions and 4 deletions
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14
tools/virsh-domain.c
View File

@ -267,6 +267,10 @@ static const vshCmdOptDef opts_attach_disk[] = {
.type = VSH_OT_STRING,
.help = N_("cache mode of disk device")
},
{.name = "io",
.type = VSH_OT_STRING,
.help = N_("io policy of disk device")
},
{.name = "type",
.type = VSH_OT_STRING,
.help = N_("target device type")
@ -504,8 +508,9 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
virDomainPtr dom = NULL;
const char *source = NULL, *target = NULL, *driver = NULL,
*subdriver = NULL, *type = NULL, *mode = NULL,
*iothread = NULL, *cache = NULL, *serial = NULL,
*straddr = NULL, *wwn = NULL, *targetbus = NULL;
*iothread = NULL, *cache = NULL, *io = NULL,
*serial = NULL, *straddr = NULL, *wwn = NULL,
*targetbus = NULL;
struct DiskAddress diskAddr;
bool isFile = false, functionReturn = false;
int ret;
@ -537,6 +542,7 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
vshCommandOptStringReq(ctl, cmd, "mode", &mode) < 0 ||
vshCommandOptStringReq(ctl, cmd, "iothread", &iothread) < 0 ||
vshCommandOptStringReq(ctl, cmd, "cache", &cache) < 0 ||
vshCommandOptStringReq(ctl, cmd, "io", &io) < 0 ||
vshCommandOptStringReq(ctl, cmd, "serial", &serial) < 0 ||
vshCommandOptStringReq(ctl, cmd, "wwn", &wwn) < 0 ||
vshCommandOptStringReq(ctl, cmd, "address", &straddr) < 0 ||
@ -579,7 +585,7 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
virBufferAddLit(&buf, ">\n");
virBufferAdjustIndent(&buf, 2);
if (driver || subdriver || iothread || cache) {
if (driver || subdriver || iothread || cache || io) {
virBufferAddLit(&buf, "<driver");
if (driver)
@ -590,6 +596,8 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
virBufferAsprintf(&buf, " iothread='%s'", iothread);
if (cache)
virBufferAsprintf(&buf, " cache='%s'", cache);
if (io)
virBufferAsprintf(&buf, " io='%s'", io);
virBufferAddLit(&buf, "/>\n");
}

3
tools/virsh.pod
View File

@ -2838,7 +2838,7 @@ expected.
=item B<attach-disk> I<domain> I<source> I<target> [[[I<--live>] [I<--config>]
| [I<--current>]] | [I<--persistent>]] [I<--targetbus bus>] [I<--driver
driver>] [I<--subdriver subdriver>] [I<--iothread iothread>]
[I<--cache cache>] [I<--type type>]
[I<--cache cache>] [I<--io io>] [I<--type type>]
[I<--mode mode>] [I<--sourcetype sourcetype>] [I<--serial serial>] [I<--wwn
wwn>] [I<--rawio>] [I<--address address>] [I<--multifunction>] [I<--print-xml>]
@ -2865,6 +2865,7 @@ I<mode> can specify the two specific mode I<readonly> or I<shareable>.
I<sourcetype> can indicate the type of source (block|file)
I<cache> can be one of "default", "none", "writethrough", "writeback",
"directsync" or "unsafe".
I<io> controls specific policies on I/O; QEMU guests support "threads" and "native".
I<iothread> is the number within the range of domain IOThreads to which
this disk may be attached (QEMU only).
I<serial> is the serial of disk device. I<wwn> is the wwn of disk device.