[libvirt] [PATCH 2/2] qemu: migration: fix race on cancelling drive mirror

0feebab2 adds calling qemuBlockNodeNamesDetect for completed job on updating block jobs. This affects cancelling drive mirror logic as this function drops vm lock. Now we have to recheck all disks before the disk with the completed block job before going to wait for block job events. --- src/qemu/qemu_migration.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index d7ff415..769de97 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -654,9 +654,11 @@ qemuMigrationDriveMirrorCancelled(virQEMUDriverPtr driver, { size_t i; size_t active = 0; + size_t completed = 0; int status; bool failed = false; + retry: for (i = 0; i < vm->def->ndisks; i++) { virDomainDiskDefPtr disk = vm->def->disks[i]; qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk); @@ -683,6 +685,19 @@ qemuMigrationDriveMirrorCancelled(virQEMUDriverPtr driver, default: active++; } + + if (status == VIR_DOMAIN_BLOCK_JOB_COMPLETED) + completed++; + } + + /* Updating completed block job drops the lock thus we have to recheck + * block jobs for disks that reside before the disk(s) with completed + * block job. + */ + if (completed > 0) { + completed = 0; + active = 0; + goto retry; } if (failed) { -- 1.8.3.1