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snapshot: allow block devices past cgroup
It turns out that when cgroups are enabled, the use of a block device
for a snapshot target was failing with EPERM due to libvirt failing
to add the block device to the cgroup whitelist. See also
https://bugzilla.redhat.com/show_bug.cgi?id=810200
* src/qemu/qemu_driver.c
(qemuDomainSnapshotCreateSingleDiskActive)
(qemuDomainSnapshotUndoSingleDiskActive): Account for cgroup.
(qemuDomainSnapshotCreateDiskActive): Update caller.
(cherry picked from commit 8be304ecb9
)
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@ -9877,6 +9877,7 @@ cleanup:
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static int
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qemuDomainSnapshotCreateSingleDiskActive(struct qemud_driver *driver,
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virDomainObjPtr vm,
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virCgroupPtr cgroup,
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virDomainSnapshotDiskDefPtr snap,
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virDomainDiskDefPtr disk,
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virDomainDiskDefPtr persistDisk,
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@ -9930,8 +9931,15 @@ qemuDomainSnapshotCreateSingleDiskActive(struct qemud_driver *driver,
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if (virDomainLockDiskAttach(driver->lockManager, vm, disk) < 0)
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goto cleanup;
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if (cgroup && qemuSetupDiskCgroup(driver, vm, cgroup, disk) < 0) {
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if (virDomainLockDiskDetach(driver->lockManager, vm, disk) < 0)
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VIR_WARN("Unable to release lock on %s", source);
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goto cleanup;
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}
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if (virSecurityManagerSetImageLabel(driver->securityManager, vm->def,
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disk) < 0) {
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if (cgroup && qemuTeardownDiskCgroup(driver, vm, cgroup, disk) < 0)
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VIR_WARN("Failed to teardown cgroup for disk path %s", source);
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if (virDomainLockDiskDetach(driver->lockManager, vm, disk) < 0)
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VIR_WARN("Unable to release lock on %s", source);
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goto cleanup;
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@ -9991,6 +9999,7 @@ cleanup:
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static void
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qemuDomainSnapshotUndoSingleDiskActive(struct qemud_driver *driver,
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virDomainObjPtr vm,
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virCgroupPtr cgroup,
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virDomainDiskDefPtr origdisk,
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virDomainDiskDefPtr disk,
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virDomainDiskDefPtr persistDisk,
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@ -10015,6 +10024,8 @@ qemuDomainSnapshotUndoSingleDiskActive(struct qemud_driver *driver,
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if (virSecurityManagerRestoreImageLabel(driver->securityManager,
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vm->def, disk) < 0)
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VIR_WARN("Unable to restore security label on %s", disk->src);
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if (cgroup && qemuTeardownDiskCgroup(driver, vm, cgroup, disk) < 0)
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VIR_WARN("Failed to teardown cgroup for disk path %s", disk->src);
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if (virDomainLockDiskDetach(driver->lockManager, vm, disk) < 0)
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VIR_WARN("Unable to release lock on %s", disk->src);
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if (need_unlink && stat(disk->src, &st) == 0 &&
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@ -10066,6 +10077,7 @@ qemuDomainSnapshotCreateDiskActive(virConnectPtr conn,
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int thaw = 0; /* 1 if freeze succeeded, -1 if freeze failed */
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bool atomic = (flags & VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC) != 0;
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bool reuse = (flags & VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT) != 0;
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virCgroupPtr cgroup = NULL;
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if (qemuDomainObjBeginJobWithDriver(driver, vm, QEMU_JOB_MODIFY) < 0)
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return -1;
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@ -10076,6 +10088,15 @@ qemuDomainSnapshotCreateDiskActive(virConnectPtr conn,
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goto endjob;
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}
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if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_DEVICES) &&
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virCgroupForDomain(driver->cgroup, vm->def->name, &cgroup, 0)) {
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qemuReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to find cgroup for %s"),
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vm->def->name);
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goto endjob;
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}
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/* 'cgroup' is still NULL if cgroups are disabled. */
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/* If quiesce was requested, then issue a freeze command, and a
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* counterpart thaw command, no matter what. The command will
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* fail if the guest is paused or the guest agent is not
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@ -10138,7 +10159,7 @@ qemuDomainSnapshotCreateDiskActive(virConnectPtr conn,
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}
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}
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ret = qemuDomainSnapshotCreateSingleDiskActive(driver, vm,
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ret = qemuDomainSnapshotCreateSingleDiskActive(driver, vm, cgroup,
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&snap->def->disks[i],
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vm->def->disks[i],
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persistDisk, actions,
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@ -10166,7 +10187,7 @@ qemuDomainSnapshotCreateDiskActive(virConnectPtr conn,
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persistDisk = vm->newDef->disks[indx];
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}
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qemuDomainSnapshotUndoSingleDiskActive(driver, vm,
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qemuDomainSnapshotUndoSingleDiskActive(driver, vm, cgroup,
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snap->def->dom->disks[i],
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vm->def->disks[i],
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persistDisk,
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@ -10216,6 +10237,8 @@ cleanup:
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}
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endjob:
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if (cgroup)
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virCgroupFree(&cgroup);
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if (vm && thaw != 0 &&
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qemuDomainSnapshotFSThaw(driver, vm, thaw > 0) < 0) {
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/* helper reported the error, if it was needed */
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