From: Fam Zheng <f...@redhat.com>
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 <f...@redhat.com>
Reviewed-by: Max Reitz <mre...@redhat.com>
Reviewed-by: John Snow <js...@redhat.com>
Reviewed-by: Markus Armbruster <arm...@redhat.com>
Message-id: 1418899027-8445-3-git-send-email-f...@redhat.com
Signed-off-by: Max Reitz <mre...@redhat.com>
---
block/backup.c | 28 +++++++++++++++++++++++++++
blockdev.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
qapi/block-core.json | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
qmp-commands.hx | 42 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 178 insertions(+)
diff --git a/block/backup.c b/block/backup.c
index 792e655..1c535b1 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -360,6 +360,7 @@ static void coroutine_fn backup_run(void *opaque)
hbitmap_free(job->bitmap);
bdrv_iostatus_disable(target);
+ bdrv_op_unblock_all(target, job->common.blocker);
data = g_malloc(sizeof(*data));
data->ret = ret;
@@ -379,6 +380,11 @@ void backup_start(BlockDriverState *bs, BlockDriverState
*target,
assert(target);
assert(cb);
+ if (bs == target) {
+ error_setg(errp, "Source and target cannot be the same");
+ return;
+ }
+
if ((on_source_error == BLOCKDEV_ON_ERROR_STOP ||
on_source_error == BLOCKDEV_ON_ERROR_ENOSPC) &&
!bdrv_iostatus_is_enabled(bs)) {
@@ -386,6 +392,26 @@ void backup_start(BlockDriverState *bs, BlockDriverState
*target,
return;
}
+ if (!bdrv_is_inserted(bs)) {
+ error_setg(errp, "Device is not inserted: %s",
+ bdrv_get_device_name(bs));
+ return;
+ }
+
+ if (!bdrv_is_inserted(target)) {
+ error_setg(errp, "Device is not inserted: %s",
+ bdrv_get_device_name(target));
+ return;
+ }
+
+ if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
+ return;
+ }
+
+ if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_BACKUP_TARGET, errp)) {
+ return;
+ }
+
len = bdrv_getlength(bs);
if (len < 0) {
error_setg_errno(errp, -len, "unable to get length for '%s'",
@@ -399,6 +425,8 @@ void backup_start(BlockDriverState *bs, BlockDriverState
*target,
return;
}
+ bdrv_op_block_all(target, job->common.blocker);
+
job->on_source_error = on_source_error;
job->on_target_error = on_target_error;
job->target = target;
diff --git a/blockdev.c b/blockdev.c
index 5651a8e..d6ccc5e 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2240,6 +2240,8 @@ void qmp_drive_backup(const char *device, const char
*target,
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
+ /* Although backup_run has this check too, we need to use bs->drv below, so
+ * do an early check redundantly. */
if (!bdrv_is_inserted(bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
goto out;
@@ -2256,6 +2258,7 @@ void qmp_drive_backup(const char *device, const char
*target,
}
}
+ /* Early check to avoid creating target */
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
goto out;
}
@@ -2323,6 +2326,57 @@ BlockDeviceInfoList *qmp_query_named_block_nodes(Error
**errp)
return bdrv_named_nodes_list();
}
+void qmp_blockdev_backup(const char *device, const char *target,
+ enum MirrorSyncMode sync,
+ bool has_speed, int64_t speed,
+ bool has_on_source_error,
+ BlockdevOnError on_source_error,
+ bool has_on_target_error,
+ BlockdevOnError on_target_error,
+ Error **errp)
+{
+ BlockDriverState *bs;
+ BlockDriverState *target_bs;
+ Error *local_err = NULL;
+ AioContext *aio_context;
+
+ if (!has_speed) {
+ speed = 0;
+ }
+ if (!has_on_source_error) {
+ on_source_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+ if (!has_on_target_error) {
+ on_target_error = BLOCKDEV_ON_ERROR_REPORT;
+ }
+
+ bs = bdrv_find(device);
+ if (!bs) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return;
+ }
+
+ aio_context = bdrv_get_aio_context(bs);
+ aio_context_acquire(aio_context);
+
+ target_bs = bdrv_find(target);
+ if (!target_bs) {
+ error_set(errp, QERR_DEVICE_NOT_FOUND, target);
+ goto out;
+ }
+
+ bdrv_ref(target_bs);
+ bdrv_set_aio_context(target_bs, aio_context);
+ backup_start(bs, target_bs, speed, sync, on_source_error, on_target_error,
+ block_job_cb, bs, &local_err);
+ if (local_err != NULL) {
+ bdrv_unref(target_bs);
+ error_propagate(errp, local_err);
+ }
+out:
+ aio_context_release(aio_context);
+}
+
#define DEFAULT_MIRROR_BUF_SIZE (10 << 20)
void qmp_drive_mirror(const char *device, const char *target,
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 2d8bd25..80984d1 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -703,6 +703,41 @@
'*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
#
# Generates a synchronous snapshot of a block device.
@@ -822,6 +857,25 @@
{ '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
#
# Get the named block driver list
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 6945d30..8957201 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1094,6 +1094,48 @@ Example:
"sync": "full",
"target": "backup.img" } }
<- { "return": {} }
+
+EQMP
+
+ {
+ .name = "blockdev-backup",
+ .args_type = "sync:s,device:B,target:B,speed:i?,"
+ "on-source-error:s?,on-target-error:s?",
+ .mhandler.cmd_new = qmp_marshal_input_blockdev_backup,
+ },
+
+SQMP
+blockdev-backup
+---------------
+
+The device version of drive-backup: this command takes an existing named device
+as backup target.
+
+Arguments:
+
+- "device": the name of the device which should be copied.
+ (json-string)
+- "target": the name of the backup target device. (json-string)
+- "sync": what parts of the disk image should be copied to the destination;
+ possibilities include "full" for all the disk, "top" for only the
+ 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)
+- "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.
+ (BlockdevOnError, optional)
+- "on-target-error": the action to take on an error on the target, default
+ 'report' (no limitations, since this applies to
+ a different block device than device).
+ (BlockdevOnError, optional)
+
+Example:
+-> { "execute": "blockdev-backup", "arguments": { "device": "src-id",
+ "sync": "full",
+ "target": "tgt-id" } }
+<- { "return": {} }
+
EQMP
{
--
2.1.0
