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vmdk: Add trivial backing_fmt support

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vmdk already requires that if backing_file is present, that it be
another vmdk image (see vmdk_co_do_create).  Meanwhile, we want to
move towards always being explicit about the backing format for other
drivers where it matters.  So for convenience, make qemu-img create -F
vmdk work, while rejecting all other explicit formats (note that this
is only for QemuOpts usage; there is no change to the QAPI to allow a
format through -blockdev).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200706203954.341758-5-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-07-06 15:39:48 -05:00 committed by Kevin Wolf
parent 80fa43e7df
commit d51a814cf4
1 changed files with 14 additions and 0 deletions
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14
block/vmdk.c
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@ -2633,6 +2633,14 @@ static int coroutine_fn vmdk_co_create_opts(BlockDriver *drv,
bool zeroed_grain;
bool compat6;
VMDKCreateOptsData data;
char *backing_fmt = NULL;
backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT);
if (backing_fmt && strcmp(backing_fmt, "vmdk") != 0) {
error_setg(errp, "backing_file must be a vmdk image");
ret = -EINVAL;
goto exit;
}
if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) {
ret = -EINVAL;
@ -2691,6 +2699,7 @@ static int coroutine_fn vmdk_co_create_opts(BlockDriver *drv,
vmdk_co_create_opts_cb, &data, errp);
exit:
g_free(backing_fmt);
g_free(adapter_type);
g_free(backing_file);
g_free(hw_version);
@ -3026,6 +3035,11 @@ static QemuOptsList vmdk_create_opts = {
.type = QEMU_OPT_STRING,
.help = "File name of a base image"
},
{
.name = BLOCK_OPT_BACKING_FMT,
.type = QEMU_OPT_STRING,
.help = "Must be 'vmdk' if present",
},
{
.name = BLOCK_OPT_COMPAT6,
.type = QEMU_OPT_BOOL,