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block: Return depth level during bdrv_is_allocated_above

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When checking for allocation across a chain, it's already easy to
count the depth within the chain at which the allocation is found.
Instead of throwing that information away, return it to the caller.
Existing callers only cared about allocated/non-allocated, but having
a depth available will be used by NBD in the next patch.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201027050556.269064-9-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
[eblake: rebase to master]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2020-10-27 00:05:53 -05:00
parent 3b1f244c59
commit a92b1b065e
5 changed files with 30 additions and 13 deletions
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2
block/commit.c
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@ -156,7 +156,7 @@ static int coroutine_fn commit_run(Job *job, Error **errp)
/* Copy if allocated above the base */
ret = bdrv_is_allocated_above(blk_bs(s->top), s->base_overlay, true,
offset, COMMIT_BUFFER_SIZE, &n);
copy = (ret == 1);
copy = (ret > 0);
trace_commit_one_iteration(s, offset, n, ret);
if (copy) {
assert(n < SIZE_MAX);