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block: Freeze the backing chain for the duration of the stream job 

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2019-03-12 18:48:43 +02:00 committed by Kevin Wolf
parent ef53dc09ed
commit 6585493369
1 changed files with 21 additions and 0 deletions
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21
block/stream.c
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@ -35,6 +35,7 @@ typedef struct StreamBlockJob {
BlockdevOnError on_error;
char *backing_file_str;
bool bs_read_only;
bool chain_frozen;
} StreamBlockJob;
static int coroutine_fn stream_populate(BlockBackend *blk,
@ -49,6 +50,16 @@ static int coroutine_fn stream_populate(BlockBackend *blk,
return blk_co_preadv(blk, offset, qiov.size, &qiov, BDRV_REQ_COPY_ON_READ);
}
static void stream_abort(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
if (s->chain_frozen) {
BlockJob *bjob = &s->common;
bdrv_unfreeze_backing_chain(blk_bs(bjob->blk), s->base);
}
}
static int stream_prepare(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
@ -58,6 +69,9 @@ static int stream_prepare(Job *job)
Error *local_err = NULL;
int ret = 0;
bdrv_unfreeze_backing_chain(bs, base);
s->chain_frozen = false;
if (bs->backing) {
const char *base_id = NULL, *base_fmt = NULL;
if (base) {
@ -208,6 +222,7 @@ static const BlockJobDriver stream_job_driver = {
.free = block_job_free,
.run = stream_run,
.prepare = stream_prepare,
.abort = stream_abort,
.clean = stream_clean,
.user_resume = block_job_user_resume,
.drain = block_job_drain,
@ -254,9 +269,15 @@ void stream_start(const char *job_id, BlockDriverState *bs,
&error_abort);
}
if (bdrv_freeze_backing_chain(bs, base, errp) < 0) {
job_early_fail(&s->common.job);
goto fail;
}
s->base = base;
s->backing_file_str = g_strdup(backing_file_str);
s->bs_read_only = bs_read_only;
s->chain_frozen = true;
s->on_error = on_error;
trace_stream_start(bs, base, s);