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Block layer patches

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- Optimise reqs_lock to make multiqueue actually scale
 - virtio: Drop out of coroutine context in virtio_load()
 - iotests: Fix reference output for some tests after recent changes
 - vpc: Avoid dynamic stack allocation
 - Code cleanup, improved documentation
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Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Optimise reqs_lock to make multiqueue actually scale
- virtio: Drop out of coroutine context in virtio_load()
- iotests: Fix reference output for some tests after recent changes
- vpc: Avoid dynamic stack allocation
- Code cleanup, improved documentation

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  virtio: Drop out of coroutine context in virtio_load()
  vmstate: Mark VMStateInfo.get/put() coroutine_mixed_fn
  block: Make more BlockDriver definitions static
  block/meson.build: Restore alphabetical order of files
  block: Remove unnecessary variable in bdrv_block_device_info
  block: Remove bdrv_query_block_node_info
  vmdk: Clean up bdrv_open_child() return value check
  qemu-img: Update documentation for compressed images
  block: Be more verbose in create fallback
  block/iscsi: Document why we use raw malloc()
  qemu-img: omit errno value in error message
  block: change reqs_lock to QemuMutex
  block: minimize bs->reqs_lock section in tracked_request_end()
  iotests: adapt test output for new qemu_cleanup() behavior
  block/vpc: Avoid dynamic stack allocation

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-09-11 09:11:22 -04:00
commit 78f8b6d9c8
22 changed files with 142 additions and 80 deletions
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19
docs/tools/qemu-img.rst
View file

@ -106,7 +106,11 @@ by the used format or see the format descriptions below for details.
.. option:: -c
Indicates that target image must be compressed (qcow format only).
Indicates that target image must be compressed (qcow/qcow2 and vmdk with
streamOptimized subformat only).
For qcow2, the compression algorithm can be specified with the ``-o
compression_type=...`` option (see below).
.. option:: -h
@ -776,7 +780,7 @@ Supported image file formats:
QEMU image format, the most versatile format. Use it to have smaller
images (useful if your filesystem does not supports holes, for example
on Windows), optional AES encryption, zlib based compression and
on Windows), optional AES encryption, zlib or zstd based compression and
support of multiple VM snapshots.
Supported options:
@ -794,6 +798,17 @@ Supported image file formats:
``backing_fmt``
Image format of the base image
``compression_type``
This option configures which compression algorithm will be used for
compressed clusters on the image. Note that setting this option doesn't yet
cause the image to actually receive compressed writes. It is most commonly
used with the ``-c`` option of ``qemu-img convert``, but can also be used
with the ``compress`` filter driver or backup block jobs with compression
enabled.
Valid values are ``zlib`` and ``zstd``. For images that use
``compat=0.10``, only ``zlib`` compression is available.
``encryption``
If this option is set to ``on``, the image is encrypted with
128-bit AES-CBC.