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block: Add Error parameter to bdrv_set_backing_hd()

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Not all callers of bdrv_set_backing_hd() know for sure that attaching
the backing file will be allowed by the permission system. Return the
error from the function rather than aborting.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-17 20:42:32 +01:00
parent c8f6d58edb
commit 12fa4af61f
6 changed files with 47 additions and 18 deletions
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9
block/stream.c
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@ -68,6 +68,7 @@ static void stream_complete(BlockJob *job, void *opaque)
StreamCompleteData *data = opaque;
BlockDriverState *bs = blk_bs(job->blk);
BlockDriverState *base = s->base;
Error *local_err = NULL;
if (!block_job_is_cancelled(&s->common) && data->reached_end &&
data->ret == 0) {
@ -79,9 +80,15 @@ static void stream_complete(BlockJob *job, void *opaque)
}
}
data->ret = bdrv_change_backing_file(bs, base_id, base_fmt);
bdrv_set_backing_hd(bs, base);
bdrv_set_backing_hd(bs, base, &local_err);
if (local_err) {
error_report_err(local_err);
data->ret = -EPERM;
goto out;
}
}
out:
/* Reopen the image back in read-only mode if necessary */
if (s->bs_flags != bdrv_get_flags(bs)) {
/* Give up write permissions before making it read-only */