diff options
| author | Stefan Hajnoczi | 2017-07-05 14:57:30 +0200 |
|---|---|---|
| committer | Max Reitz | 2017-07-11 17:45:00 +0200 |
| commit | 90880ff107ecaada2a06a823dc5fa652f6e37a62 (patch) | |
| tree | f63e4447193bad024626ead37492cddbd246e2e5 /qapi | |
| parent | tests: Avoid non-portable 'echo -ARG' (diff) | |
| download | qemu-90880ff107ecaada2a06a823dc5fa652f6e37a62.tar.gz qemu-90880ff107ecaada2a06a823dc5fa652f6e37a62.tar.xz qemu-90880ff107ecaada2a06a823dc5fa652f6e37a62.zip | |
block: add bdrv_measure() API
bdrv_measure() provides a conservative maximum for the size of a new
image. This information is handy if storage needs to be allocated (e.g.
a SAN or an LVM volume) ahead of time.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20170705125738.8777-2-stefanha@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/block-core.json | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json index 4bf11e8b8b..c437aa50ef 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -488,6 +488,31 @@ '*dirty-bitmaps': ['BlockDirtyInfo'] } } ## +# @BlockMeasureInfo: +# +# Image file size calculation information. This structure describes the size +# requirements for creating a new image file. +# +# The size requirements depend on the new image file format. File size always +# equals virtual disk size for the 'raw' format, even for sparse POSIX files. +# Compact formats such as 'qcow2' represent unallocated and zero regions +# efficiently so file size may be smaller than virtual disk size. +# +# The values are upper bounds that are guaranteed to fit the new image file. +# Subsequent modification, such as internal snapshot or bitmap creation, may +# require additional space and is not covered here. +# +# @required: Size required for a new image file, in bytes. +# +# @fully-allocated: Image file size, in bytes, once data has been written +# to all sectors. +# +# Since: 2.10 +## +{ 'struct': 'BlockMeasureInfo', + 'data': {'required': 'int', 'fully-allocated': 'int'} } + +## # @query-block: # # Get a list of BlockInfo for all virtual block devices. |