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block/backup: Add mirror sync mode 'bitmap'

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We don't need or want a new sync mode for simple differences in
semantics.  Create a new mode simply named "BITMAP" that is designed to
make use of the new Bitmap Sync Mode field.

Because the only bitmap sync mode is 'on-success', this adds no new
functionality to the backup job (yet). The old incremental backup mode
is maintained as a syntactic sugar for sync=bitmap, mode=on-success.

Add all of the plumbing necessary to support this new instruction.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190709232550.10724-6-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
John Snow 2019-07-29 16:35:52 -04:00
parent 00a463b1dc
commit c8b5650178
6 changed files with 58 additions and 20 deletions
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21
qapi/block-core.json
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@ -1127,12 +1127,15 @@
#
# @none: only copy data written from now on
#
# @incremental: only copy data described by the dirty bitmap. Since: 2.4
# @incremental: only copy data described by the dirty bitmap. (since: 2.4)
#
# @bitmap: only copy data described by the dirty bitmap. (since: 4.2)
# Behavior on completion is determined by the BitmapSyncMode.
#
# Since: 1.3
##
{ 'enum': 'MirrorSyncMode',
'data': ['top', 'full', 'none', 'incremental'] }
'data': ['top', 'full', 'none', 'incremental', 'bitmap'] }
##
# @BitmapSyncMode:
@ -1343,9 +1346,14 @@
# @speed: the maximum speed, in bytes per second. The default is 0,
# for unlimited.
#
# @bitmap: the name of dirty bitmap if sync is "incremental".
# Must be present if sync is "incremental", must NOT be present
# otherwise. (Since 2.4 (drive-backup), 3.1 (blockdev-backup))
# @bitmap: the name of a dirty bitmap if sync is "bitmap" or "incremental".
# Must be present if sync is "bitmap" or "incremental".
# Must not be present otherwise.
# (Since 2.4 (drive-backup), 3.1 (blockdev-backup))
#
# @bitmap-mode: Specifies the type of data the bitmap should contain after
# the operation concludes. Must be present if sync is "bitmap".
# Must NOT be present otherwise. (Since 4.2)
#
# @compress: true to compress data, if the target format supports it.
# (default: false) (since 2.8)
@ -1380,7 +1388,8 @@
{ 'struct': 'BackupCommon',
'data': { '*job-id': 'str', 'device': 'str',
'sync': 'MirrorSyncMode', '*speed': 'int',
'*bitmap': 'str', '*compress': 'bool',
'*bitmap': 'str', '*bitmap-mode': 'BitmapSyncMode',
'*compress': 'bool',
'*on-source-error': 'BlockdevOnError',
'*on-target-error': 'BlockdevOnError',
'*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }