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qemu: Conditionally allow block-copy for persistent domains

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Allow starting the block-copy job for a persistent domain if a user
declares by using a flag that the job will not be recovered if the VM is
switched off while the job is active.

This allows to use the block-copy job with persistent VMs under the same
conditions as would apply to transient domains.
This commit is contained in:
Peter Krempa 2017-06-06 15:13:51 +02:00
parent 49d30bc2e2
commit b7e534c651
3 changed files with 13 additions and 3 deletions
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3
include/libvirt/libvirt-domain.h
View File

@ -2428,6 +2428,9 @@ typedef enum {
backing chain */
VIR_DOMAIN_BLOCK_COPY_REUSE_EXT = 1 << 1, /* Reuse existing external
file for a copy */
VIR_DOMAIN_BLOCK_COPY_TRANSIENT_JOB = 1 << 2, /* Don't force usage of
recoverable job for the
copy operation */
} virDomainBlockCopyFlags;
/**

4
src/libvirt-domain.c
View File

@ -10027,6 +10027,10 @@ virDomainBlockRebase(virDomainPtr dom, const char *disk,
* or virDomainDetachDevice(), while a copy job is active; they may
* also restrict a copy job to transient domains.
*
* If @flags contains VIR_DOMAIN_BLOCK_COPY_TRANSIENT_JOB the job will not be
* recoverable if the VM is turned off while job is active. This flag will
* remove the restriction of copy jobs to transient domains.
*
* The @disk parameter is either an unambiguous source name of the
* block device (the <source file='...'/> sub-element, such as
* "/path/to/image"), or the device target shorthand (the

9
src/qemu/qemu_driver.c
View File

@ -16507,7 +16507,8 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
/* Preliminaries: find the disk we are editing, sanity checks */
virCheckFlags(VIR_DOMAIN_BLOCK_COPY_SHALLOW |
VIR_DOMAIN_BLOCK_COPY_REUSE_EXT, -1);
VIR_DOMAIN_BLOCK_COPY_REUSE_EXT |
VIR_DOMAIN_BLOCK_COPY_TRANSIENT_JOB, -1);
priv = vm->privateData;
cfg = virQEMUDriverGetConfig(driver);
@ -16546,7 +16547,8 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
_("block copy is not supported with this QEMU binary"));
goto endjob;
}
if (vm->persistent) {
if (!(flags & VIR_DOMAIN_BLOCK_COPY_TRANSIENT_JOB) &&
vm->persistent) {
/* XXX if qemu ever lets us start a new domain with mirroring
* already active, we can relax this; but for now, the risk of
* 'managedsave' due to libvirt-guests means we can't risk
@ -16773,7 +16775,8 @@ qemuDomainBlockCopy(virDomainPtr dom, const char *disk, const char *destxml,
size_t i;
virCheckFlags(VIR_DOMAIN_BLOCK_COPY_SHALLOW |
VIR_DOMAIN_BLOCK_COPY_REUSE_EXT, -1);
VIR_DOMAIN_BLOCK_COPY_REUSE_EXT |
VIR_DOMAIN_BLOCK_COPY_TRANSIENT_JOB, -1);
if (virTypedParamsValidate(params, nparams,
VIR_DOMAIN_BLOCK_COPY_BANDWIDTH,
VIR_TYPED_PARAM_ULLONG,