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block: reverse order for reopen commits

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It's needed to fix reopening qcow2 with bitmaps to RW. Currently it
can't work, as qcow2 needs write access to file child, to mark bitmaps
in-image with IN_USE flag. But usually children goes after parents in
reopen queue and file child is still RO on qcow2 reopen commit. Reverse
reopen order to fix it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Acked-by: Max Reitz <mreitz@redhat.com>
Acked-by: John Snow <jsnow@redhat.com>
Message-id: 20190927122355.7344-3-vsementsov@virtuozzo.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-09-27 15:23:48 +03:00 committed by John Snow
parent 859443b0fb
commit fcd6a4f42d
1 changed files with 9 additions and 3 deletions
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12
block.c
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@ -3486,10 +3486,16 @@ int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
bs_entry->perms_checked = true;
}
/* If we reach this point, we have success and just need to apply the
* changes
/*
* If we reach this point, we have success and just need to apply the
* changes.
*
* Reverse order is used to comfort qcow2 driver: on commit it need to write
* IN_USE flag to the image, to mark bitmaps in the image as invalid. But
* children are usually goes after parents in reopen-queue, so go from last
* to first element.
*/
QTAILQ_FOREACH(bs_entry, bs_queue, entry) {
QTAILQ_FOREACH_REVERSE(bs_entry, bs_queue, entry) {
bdrv_reopen_commit(&bs_entry->state);
}