Am 07.01.2013 06:26, schrieb Dong Xu Wang:
> This patch will use QemuOpts related functions in block layer, add
> a member bdrv_create_options to BlockDriver struct, it will return
> a QemuOptsList pointer, which includes the image format's create
> options.
>
> And create options's primary consumer is block creating related functions,
> so modify them together.
>
> Signed-off-by: Dong Xu Wang <wdon...@linux.vnet.ibm.com>
> diff --git a/block/qcow.c b/block/qcow.c
> index 4276610..46aad7f 100644
> --- a/block/qcow.c
> +++ b/block/qcow.c
> @@ -651,7 +651,7 @@ static void qcow_close(BlockDriverState *bs)
> error_free(s->migration_blocker);
> }
>
> -static int qcow_create(const char *filename, QEMUOptionParameter *options)
> +static int qcow_create(const char *filename, QemuOpts *opts)
> {
> int header_size, backing_filename_len, l1_size, shift, i;
> QCowHeader header;
> @@ -662,19 +662,16 @@ static int qcow_create(const char *filename,
> QEMUOptionParameter *options)
> int ret;
> BlockDriverState *qcow_bs;
>
> - /* Read out options */
> - while (options && options->name) {
> - if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
> - total_size = options->value.n / 512;
> - } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
> - backing_file = options->value.s;
> - } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) {
> - flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
> + /* Read out opts */
> + if (opts) {
Can opts ever be NULL? (Same question for all other block drivers)
> + total_size = qemu_opt_get_number(opts, BLOCK_OPT_SIZE, 0) / 512;
> + backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE);
> + if (qemu_opt_get_bool(opts, BLOCK_OPT_ENCRYPT, 0)) {
> + flags |= BLOCK_FLAG_ENCRYPT;
> }
> - options++;
> }
>
> - ret = bdrv_create_file(filename, options);
> + ret = bdrv_create_file(filename, NULL);
Why is this change correct?
Previously you could pass options to the protocol that are not supported
by the file format. For example, you can specify a backing file for raw
over sheepdog. Interestingly you keep this correct behaviour for raw,
but you seem to break it for other image formats.
> if (ret < 0) {
> return ret;
> }
Kevin
