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block: add 'speed' optional parameter to block-stream

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Allow streaming operations to be started with an initial speed limit.
This eliminates the window of time between starting streaming and
issuing block-job-set-speed.  Users should use the new optional 'speed'
parameter instead so that speed limits are in effect immediately when
the job starts.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2012-04-25 16:51:03 +01:00 • committed by Luiz Capitulino
parent 882ec7ce53
commit c83c66c3b5
8 changed files with 42 additions and 15 deletions
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6
blockdev.c
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@ -1091,7 +1091,8 @@ static void block_stream_cb(void *opaque, int ret)
}
void qmp_block_stream(const char *device, bool has_base,
const char *base, Error **errp)
const char *base, bool has_speed,
int64_t speed, Error **errp)
{
BlockDriverState *bs;
BlockDriverState *base_bs = NULL;
@ -1111,7 +1112,8 @@ void qmp_block_stream(const char *device, bool has_base,
}
}
stream_start(bs, base_bs, base, block_stream_cb, bs, &local_err);
stream_start(bs, base_bs, base, has_speed ? speed : 0,
block_stream_cb, bs, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;