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block: Check blockers in all nodes involved in a block-commit job

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qmp_block_commit() checks for op blockers in the active and
destination (base) images. However all nodes between top_bs and base
are also involved, and they are removed from the chain afterwards.

In addition to that, if top_bs is not the active layer then top_bs's
overlay also needs to be checked because it's involved in the job (its
backing image string needs to be updated to point to 'base').

This patch checks that none of those nodes are blocked.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2016-10-28 10:08:07 +03:00 committed by Kevin Wolf
parent b7340d002e
commit 058223a6e3
1 changed files with 9 additions and 2 deletions
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9
blockdev.c
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@ -3001,6 +3001,7 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *iter;
BlockDriverState *base_bs, *top_bs;
AioContext *aio_context;
Error *local_err = NULL;
@ -3067,9 +3068,11 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
assert(bdrv_get_aio_context(base_bs) == aio_context);
if (bdrv_op_is_blocked(base_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
for (iter = top_bs; iter != backing_bs(base_bs); iter = backing_bs(iter)) {
if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
goto out;
}
}
/* Do not allow attempts to commit an image into itself */
if (top_bs == base_bs) {
@ -3086,6 +3089,10 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
commit_active_start(has_job_id ? job_id : NULL, bs, base_bs, speed,
on_error, block_job_cb, bs, &local_err, false);
} else {
BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
goto out;
}
commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
on_error, block_job_cb, bs,
has_backing_file ? backing_file : NULL, &local_err);