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qmp: Add command 'blockdev-backup'

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Similar to drive-backup, but this command uses a device id as target
instead of creating/opening an image file.

Also add blocker on target bs, since the target is also a named device
now.

Add check and report error for bs == target which became possible but is
an illegal case with introduction of blockdev-backup.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1418899027-8445-3-git-send-email-famz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Fam Zheng 2014-12-18 18:37:05 +08:00 • committed by Stefan Hajnoczi
parent b7b9d39a7a
commit c29c1dd312
4 changed files with 178 additions and 0 deletions
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54
qapi/block-core.json
View file

@ -702,6 +702,41 @@
'*on-source-error': 'BlockdevOnError',
'*on-target-error': 'BlockdevOnError' } }
##
# @BlockdevBackup
#
# @device: the name of the device which should be copied.
#
# @target: the name of the backup target device.
#
# @sync: what parts of the disk image should be copied to the destination
# (all the disk, only the sectors allocated in the topmost image, or
# only new I/O).
#
# @speed: #optional the maximum speed, in bytes per second. The default is 0,
# for unlimited.
#
# @on-source-error: #optional the action to take on an error on the source,
# default 'report'. 'stop' and 'enospc' can only be used
# if the block device supports io-status (see BlockInfo).
#
# @on-target-error: #optional the action to take on an error on the target,
# default 'report' (no limitations, since this applies to
# a different block device than @device).
#
# Note that @on-source-error and @on-target-error only affect background I/O.
# If an error occurs during a guest write request, the device's rerror/werror
# actions will be used.
#
# Since: 2.3
##
{ 'type': 'BlockdevBackup',
'data': { 'device': 'str', 'target': 'str',
'sync': 'MirrorSyncMode',
'*speed': 'int',
'*on-source-error': 'BlockdevOnError',
'*on-target-error': 'BlockdevOnError' } }
##
# @blockdev-snapshot-sync
#
@ -821,6 +856,25 @@
##
{ 'command': 'drive-backup', 'data': 'DriveBackup' }
##
# @blockdev-backup
#
# Start a point-in-time copy of a block device to a new destination. The
# status of ongoing blockdev-backup operations can be checked with
# query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
# The operation can be stopped before it has completed using the
# block-job-cancel command.
#
# For the arguments, see the documentation of BlockdevBackup.
#
# Returns: Nothing on success.
# If @device or @target is not a valid block device, DeviceNotFound.
#
# Since 2.3
##
{ 'command': 'blockdev-backup', 'data': 'BlockdevBackup' }
##
# @query-named-block-nodes
#