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block: introduce compress filter driver

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Allow writing all the data compressed through the filter driver.
The written data will be aligned by the cluster size.
Based on the QEMU current implementation, that data can be written to
unallocated clusters only. May be used for a backup job.

Suggested-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 1575288906-551879-2-git-send-email-andrey.shinkevich@virtuozzo.com
[mreitz: Replace NULL bdrv_get_format_name() by "(no format)"]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Andrey Shinkevich 2019-12-02 15:15:04 +03:00 • committed by Max Reitz
parent 1b35b85abb
commit f41388e0fb
3 changed files with 175 additions and 4 deletions
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10
qapi/block-core.json
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@ -2884,15 +2884,16 @@
# @copy-on-read: Since 3.0
# @blklogwrites: Since 3.0
# @blkreplay: Since 4.2
# @compress: Since 5.0
#
# Since: 2.9
##
{ 'enum': 'BlockdevDriver',
'data': [ 'blkdebug', 'blklogwrites', 'blkreplay', 'blkverify', 'bochs',
'cloop', 'copy-on-read', 'dmg', 'file', 'ftp', 'ftps', 'gluster',
'host_cdrom', 'host_device', 'http', 'https', 'iscsi', 'luks',
'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels', 'qcow',
'qcow2', 'qed', 'quorum', 'raw', 'rbd',
'cloop', 'compress', 'copy-on-read', 'dmg', 'file', 'ftp', 'ftps',
'gluster', 'host_cdrom', 'host_device', 'http', 'https', 'iscsi',
'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels',
'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
{ 'name': 'replication', 'if': 'defined(CONFIG_REPLICATION)' },
'sheepdog',
'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }
@ -4060,6 +4061,7 @@
'blkreplay': 'BlockdevOptionsBlkreplay',
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',
'compress': 'BlockdevOptionsGenericFormat',
'copy-on-read':'BlockdevOptionsGenericFormat',
'dmg': 'BlockdevOptionsGenericFormat',
'file': 'BlockdevOptionsFile',