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block: Introduce BDS.file_child 

Store the BdrvChild for bs->file. At this point, bs->file_child->bs just
duplicates the bs->file pointer. Later, it will completely replace it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
master
Kevin Wolf 2015-06-15 14:11:51 +02:00
parent 68e517a8d7
commit 1fdd693308
2 changed files with 10 additions and 3 deletions
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12
block.c
View File

@ -1487,11 +1487,17 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename,
assert(file == NULL);
bs->open_flags = flags;
ret = bdrv_open_image(&file, filename, options, "file",
bs, &child_file, true, &local_err);
if (ret < 0) {
bs->file_child = bdrv_open_child(filename, options, "file", bs,
&child_file, true, &local_err);
if (local_err) {
ret = -EINVAL;
goto fail;
}
if (bs->file_child) {
file = bs->file_child->bs;
}
}
/* Image format probing */

1
include/block/block_int.h
View File

@ -381,6 +381,7 @@ struct BlockDriverState {
BlockDriverState *backing_hd;
BdrvChild *backing_child;
BlockDriverState *file;
BdrvChild *file_child;
NotifierList close_notifiers;