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block: Allow overriding backing.file.filename

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If a filename is passed in the driver-specific options from the command
line, the backing file path from the image is ignored now.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2013-04-12 20:27:07 +02:00
parent 56d1b4d21d
commit 1cb6f50644
1 changed files with 3 additions and 1 deletions
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4
block.c
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@ -889,7 +889,9 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options)
}
bs->open_flags &= ~BDRV_O_NO_BACKING;
if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) {
if (qdict_haskey(options, "file.filename")) {
backing_filename[0] = '\0';
} else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) {
QDECREF(options);
return 0;
}