[libvirt] [PATCH 0/6] Support online block resizing

Upstream QEMU introduced online block resizing to resize the block device when domain is running since commit 6d4a2b3a4795. It simply reuses existing "bdrv_truncate" method which is used by "qemu-img" to resize the images. This means it supports to resize all the format that "qemu-img resize" supports. E.g. qcow2, raw, qed, qcow, etc. (NB, it doesn't support to shrink size of qcow2 image, and QEMU reports "An undefined error has ocurred" in this case). For block device of virtio bus, the guest can update the device size automatically, needs kernel support, since kernel-2.6.32-117: http://patchwork.usersys.redhat.com/patch/33040/ For block device of SCSI bus, one needs to execute command like below in the guest (linux) to update the size: % echo > /sys/class/scsi_device/0:0:0:0/device/rescan For block device of IDE bus, seems there is no way to let guest update the size after resizing. The new API is defined as: int virDomainBlockResize (virDomainPtr dom, const char *device, unsigned long long size, unsigned int flags) * @device is the name of block device, E.g. vda, vdb. * Units for @size is KB. [PATCH 1/6] block_resize: Define the new API [PATCH 2/6] block_resize: Implemente the public API [PATCH 3/6] block_resize: Wire up the remote protocol [PATCH 4/6] block_resize: Implemente the qemu monitor functions [PATCH 5/6] block_resize: Implemente the internal API for qemu [PATCH 6/6] block_resize: Expose the new API in virsh Regards, Osier