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blockdev-backup: added support for data compression

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The idea is simple - backup is "written-once" data. It is written block
by block and it is large enough. It would be nice to save storage
space and compress it.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Jeff Cody <jcody@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: John Snow <jsnow@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Pavel Butsykin 2016-07-22 11:17:53 +03:00 committed by Kevin Wolf
parent 13b9414b57
commit 3b7b123659
3 changed files with 12 additions and 3 deletions
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7
blockdev.c
View file

@ -3254,6 +3254,9 @@ void do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn, Error **errp)
if (!backup->has_job_id) {
backup->job_id = NULL;
}
if (!backup->has_compress) {
backup->compress = false;
}
bs = qmp_get_root_bs(backup->device, errp);
if (!bs) {
@ -3280,8 +3283,8 @@ void do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn, Error **errp)
}
}
backup_start(backup->job_id, bs, target_bs, backup->speed, backup->sync,
NULL, false, backup->on_source_error, backup->on_target_error,
block_job_cb, bs, txn, &local_err);
NULL, backup->compress, backup->on_source_error,
backup->on_target_error, block_job_cb, bs, txn, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
}

4
qapi/block-core.json
View file

@ -939,6 +939,9 @@
# @speed: #optional the maximum speed, in bytes per second. The default is 0,
# for unlimited.
#
# @compress: #optional true to compress data, if the target format supports it.
# (default: false) (since 2.7)
#
# @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).
@ -957,6 +960,7 @@
'data': { '*job-id': 'str', 'device': 'str', 'target': 'str',
'sync': 'MirrorSyncMode',
'*speed': 'int',
'*compress': 'bool',
'*on-source-error': 'BlockdevOnError',
'*on-target-error': 'BlockdevOnError' } }

4
qmp-commands.hx
View file

@ -1275,7 +1275,7 @@ EQMP
{
.name = "blockdev-backup",
.args_type = "job-id:s?,sync:s,device:B,target:B,speed:i?,"
.args_type = "job-id:s?,sync:s,device:B,target:B,speed:i?,compress:b?,"
"on-source-error:s?,on-target-error:s?",
.mhandler.cmd_new = qmp_marshal_blockdev_backup,
},
@ -1299,6 +1299,8 @@ Arguments:
sectors allocated in the topmost image, or "none" to only replicate
new I/O (MirrorSyncMode).
- "speed": the maximum speed, in bytes per second (json-int, optional)
- "compress": true to compress data, if the target format supports it.
(json-bool, optional, default false)
- "on-source-error": 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.