This series sets out the foundations of an api for in place image conversion,
and implements it
in the QED and QCOW2 drivers.
The basic flow of conversion is as follows:
The source image is openened as normal.
The source file is the queried for conversion options via
bdrv_get_conversion_options. The conversion
options contain things like the size of the clusters, the type of encryption
etc.
The target image is then opened with bdrv_open_conversion_target, passing the
conversion optionons
among other things allong with it. This is basically a hybrid of bdrv_open and
bdrv_create.
Mappings are then fetched and set using bdrv_get_mapping and bdrv_map
respectively. They both deal
with data in the format guest_offset, host_offset, and contiguous_bytes. For
example if
guest_offset = 31, host_offset = 41, and contiguous_bytes = 59 that would mean
that offset 31 in the
virtual disk would be located at offset 41 in the image file and 32 at 42 and
so on up to 89 at 99.
At the end of the mapping process the image is "finalized" with
bdrv_copy_header, where the target
driver copies out the old header to a temporary file, and then writes out its
own header into the
image.
I've integerated inplace conversion into qemu-img in the form:
qemu-img convert-inplace <imagefile> <target_format>
I've also integrated bdrv_get_mapping and bdrv_map into qemu-io (with the
former replacing qemu-io's
internal mapping when then block driver supports it)
Devin Nakamura (24):
block: add block conversion api
block: add bdrv_get_conversion_options()
block: add bdrv_open_conversion_target()
block: add bdrv_get_mapping()
block: add bdrv_map()
block: add bdrv_copy_header()
qed: make qed_alloc_clusters round up offset to nearest cluster
qed: add qed_find_cluster_sync()
qed: add qed_bdrv_get_mapping()
qed: add qed_bdrv_map()
qed: add open_conversion_target()
qed: add bdrv_qed_copy_header()
qed: add bdrv_qed_get_conversion_options()
qcow2: fix typo in documentation for qcow2_get_cluster_offset()
qcow2: split up the creation of new refcount table from the act of
checking it
qcow2: add qcow2_drop_leaked_clusters()
qcow2: add qcow2_get_mapping
qcow2: add qcow2_map
qcow2: add qcow2_copy_header()
qcow2: add get_conversion_options()
qcow2: add qcow2_open_conversion_target()
qemu-io: make map command use new block mapping function
qemu-io: add setmap command
qemu-img: add inplace conversion to qemu-img
Makefile | 2 +
block.c | 100 +++++++++++++++++++++
block.h | 14 +++
block/qcow2-cluster.c | 53 +++++++++++-
block/qcow2-refcount.c | 71 +++++++++++++--
block/qcow2.c | 233 ++++++++++++++++++++++++++++++++++++++++++++++++
block/qcow2.h | 5 +
block/qed-cluster.c | 35 +++++++
block/qed.c | 193 ++++++++++++++++++++++++++++++++++++---
block/qed.h | 4 +
block_int.h | 88 ++++++++++++++++++
qemu-img-cmds.hx | 6 ++
qemu-img.c | 64 +++++++++++++
qemu-io.c | 47 ++++++++++-
14 files changed, 888 insertions(+), 27 deletions(-)
--
1.7.6.rc1
