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mirror: implement mirror_change method

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which allows switching the @copy-mode from 'background' to
'write-blocking'.

This is useful for management applications, so they can start out in
background mode to avoid limiting guest write speed and switch to
active mode when certain criteria are fulfilled.

In presence of an iothread, the copy_mode member is now shared between
the iothread and the main thread, so turn accesses to it atomic.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Message-ID: <20231031135431.393137-6-f.ebner@proxmox.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fiona Ebner 2023-10-31 14:54:26 +01:00 • committed by Kevin Wolf
parent 7b32ad2242
commit 2d400d15a0
2 changed files with 53 additions and 4 deletions
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13
qapi/block-core.json
View file

@ -3044,6 +3044,17 @@
{ 'command': 'block-job-finalize', 'data': { 'id': 'str' },
'allow-preconfig': true }
##
# @BlockJobChangeOptionsMirror:
#
# @copy-mode: Switch to this copy mode. Currently, only the switch
# from 'background' to 'write-blocking' is implemented.
#
# Since: 8.2
##
{ 'struct': 'BlockJobChangeOptionsMirror',
'data': { 'copy-mode' : 'MirrorCopyMode' } }
##
# @BlockJobChangeOptions:
#
@ -3058,7 +3069,7 @@
{ 'union': 'BlockJobChangeOptions',
'base': { 'id': 'str', 'type': 'JobType' },
'discriminator': 'type',
'data': {} }
'data': { 'mirror': 'BlockJobChangeOptionsMirror' } }
##
# @block-job-change: