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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
Download patch file Download diff file Expand all files Collapse all files

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);
}