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

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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 18:48:41 +02:00 committed by Kevin Wolf
parent 2cad1ebe70
commit df827336ab
1 changed files with 16 additions and 0 deletions
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16
block/commit.c
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@ -39,6 +39,7 @@ typedef struct CommitBlockJob {
BlockDriverState *base_bs;
BlockdevOnError on_error;
bool base_read_only;
bool chain_frozen;
char *backing_file_str;
} CommitBlockJob;
@ -68,6 +69,9 @@ static int commit_prepare(Job *job)
{
CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
bdrv_unfreeze_backing_chain(s->commit_top_bs, s->base_bs);
s->chain_frozen = false;
/* Remove base node parent that still uses BLK_PERM_WRITE/RESIZE before
* the normal backing chain can be restored. */
blk_unref(s->base);
@ -84,6 +88,10 @@ static void commit_abort(Job *job)
CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
BlockDriverState *top_bs = blk_bs(s->top);
if (s->chain_frozen) {
bdrv_unfreeze_backing_chain(s->commit_top_bs, s->base_bs);
}
/* Make sure commit_top_bs and top stay around until bdrv_replace_node() */
bdrv_ref(top_bs);
bdrv_ref(s->commit_top_bs);
@ -330,6 +338,11 @@ void commit_start(const char *job_id, BlockDriverState *bs,
}
}
if (bdrv_freeze_backing_chain(commit_top_bs, base, errp) < 0) {
goto fail;
}
s->chain_frozen = true;
ret = block_job_add_bdrv(&s->common, "base", base, 0, BLK_PERM_ALL, errp);
if (ret < 0) {
goto fail;
@ -362,6 +375,9 @@ void commit_start(const char *job_id, BlockDriverState *bs,
return;
fail:
if (s->chain_frozen) {
bdrv_unfreeze_backing_chain(commit_top_bs, base);
}
if (s->base) {
blk_unref(s->base);
}