Re: [Qemu-devel] [PATCH v5 4/4] raw: Don't open ZBDs if backend can't handle them

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Fri, Aug 23, 2019 at 03:49:27PM -0400, Dmitry Fomichev wrote:
> diff --git a/block/file-posix.c b/block/file-posix.c
> index d9f2fc5e46..090e7c4d2f 100644
> --- a/block/file-posix.c
> +++ b/block/file-posix.c
> @@ -2884,6 +2884,20 @@ static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared,
>              goto fail;
>          }
>      }
> +
> +    /*
> +     * If we are opening a zoned block device, check if the backend
> +     * driver can properly handle such devices, abort if not.
> +     */
> +    if (bdrv_is_zoned(bs) &&
> +        (shared & BLK_PERM_SUPPORT_ZONED) &&
> +        !(perm & BLK_PERM_SUPPORT_ZONED)) {
> +        error_setg(errp,
> +                   "block backend driver doesn't support HM zoned devices");

Spelling out "host-managed" would be helpful in the error message.  Web
search results for "hm zoned" and "hm zoned devices" aren't great,
whereas "host-managed zoned" brings up the T10 page.

> +        ret = -ENOTSUP;
> +        goto fail;
> +    }
> +
>      return 0;
>  
>  fail:
> diff --git a/hw/block/fdc.c b/hw/block/fdc.c
> index c5f41b3eb6..673a8b39bc 100644
> --- a/hw/block/fdc.c
> +++ b/hw/block/fdc.c
> @@ -570,7 +570,7 @@ static void floppy_drive_realize(DeviceState *qdev, Error **errp)
>      dev->conf.werror = BLOCKDEV_ON_ERROR_AUTO;
>  
>      if (!blkconf_apply_backend_options(&dev->conf, read_only, false, false,
> -    				       errp)) {
> +                                       errp)) {

Please squash this whitespace change into the previous patch where the
false argument was first introduced.

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