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[Qemu-block] [PULL 27/42] blockdev-backup: added support for data compre
From: |
Kevin Wolf |
Subject: |
[Qemu-block] [PULL 27/42] blockdev-backup: added support for data compression |
Date: |
Mon, 5 Sep 2016 20:13:39 +0200 |
From: Pavel Butsykin <address@hidden>
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 <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Jeff Cody <address@hidden>
CC: Markus Armbruster <address@hidden>
CC: Eric Blake <address@hidden>
CC: John Snow <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Kevin Wolf <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
blockdev.c | 7 +++++--
qapi/block-core.json | 4 ++++
qmp-commands.hx | 4 +++-
3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index f5857d0..97062e3 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -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);
}
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 300a68b..31f9990 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -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' } }
diff --git a/qmp-commands.hx b/qmp-commands.hx
index d1593c9..ba2a916 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -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.
--
1.8.3.1
- [Qemu-block] [PULL 21/42] qcow: cleanup qcow_co_pwritev_compressed to avoid the recursion, (continued)
- [Qemu-block] [PULL 21/42] qcow: cleanup qcow_co_pwritev_compressed to avoid the recursion, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 20/42] qcow: add qcow_co_pwritev_compressed, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 22/42] block: remove BlockDriver.bdrv_write_compressed, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 28/42] qemu-iotests: test backup compression in 055, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 23/42] block/io: turn on dirty_bitmaps for the compressed writes, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 24/42] block: simplify drive-backup, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 25/42] block: simplify blockdev-backup, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 29/42] qemu-iotests: add vmdk for test backup compression in 055, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 26/42] drive-backup: added support for data compression, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 27/42] blockdev-backup: added support for data compression,
Kevin Wolf <=
- [Qemu-block] [PULL 30/42] test-coroutine: Fix coroutine pool corruption, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 32/42] coroutine: Let CoMutex remember who holds it, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 31/42] qcow2: fix iovec size at qcow2_co_pwritev_compressed, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 34/42] block jobs: Improve error message for missing job ID, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 35/42] qemu-iotests: Log QMP traffic in debug mode, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 36/42] block: Allow node name for 'qemu-io' HMP command, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 38/42] coroutine: add a macro for the coroutine stack size, Kevin Wolf, 2016/09/05
- [Qemu-block] [PULL 37/42] oslib-posix: add helpers for stack alloc and free, Kevin Wolf, 2016/09/05