diff options
| author | Pavel Butsykin | 2016-07-22 10:17:52 +0200 |
|---|---|---|
| committer | Kevin Wolf | 2016-09-05 19:06:48 +0200 |
| commit | 13b9414b5798539e2dbb87a570d96184fe21edf4 (patch) | |
| tree | b78f6ea0b47ef741ec29787c15fe57edf2b98dcc /blockdev.c | |
| parent | block: simplify blockdev-backup (diff) | |
| download | qemu-13b9414b5798539e2dbb87a570d96184fe21edf4.tar.gz qemu-13b9414b5798539e2dbb87a570d96184fe21edf4.tar.xz qemu-13b9414b5798539e2dbb87a570d96184fe21edf4.zip | |
drive-backup: added support for data compression
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.
The patch adds a flag to the qmp/hmp drive-backup command which enables
block compression. Compression should be implemented in the format driver
to enable this feature.
There are some limitations of the format driver to allow compressed writes.
We can write data only once. Though for backup this is perfectly fine.
These limitations are maintained by the driver and the error will be
reported if we are doing something wrong.
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>
Diffstat (limited to 'blockdev.c')
| -rw-r--r-- | blockdev.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/blockdev.c b/blockdev.c index 5f1b01518d..f5857d0187 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3132,6 +3132,9 @@ static void do_drive_backup(DriveBackup *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) { @@ -3210,8 +3213,8 @@ static void do_drive_backup(DriveBackup *backup, BlockJobTxn *txn, Error **errp) } backup_start(backup->job_id, bs, target_bs, backup->speed, backup->sync, - bmap, backup->on_source_error, backup->on_target_error, - block_job_cb, bs, txn, &local_err); + bmap, backup->compress, backup->on_source_error, + backup->on_target_error, block_job_cb, bs, txn, &local_err); bdrv_unref(target_bs); if (local_err != NULL) { error_propagate(errp, local_err); @@ -3277,7 +3280,7 @@ void do_blockdev_backup(BlockdevBackup *backup, BlockJobTxn *txn, Error **errp) } } backup_start(backup->job_id, bs, target_bs, backup->speed, backup->sync, - NULL, backup->on_source_error, backup->on_target_error, + NULL, false, backup->on_source_error, backup->on_target_error, block_job_cb, bs, txn, &local_err); if (local_err != NULL) { error_propagate(errp, local_err); |