Re: [Qemu-devel] [PATCH v2] qemu-img: Fix qemu-img can't create qcow image based on read-only image

[Anthony Liguori]

On 01/28/2010 08:15 PM, Sheng Yang wrote:
> Commit 03cbdac7 "Disable fall-back to read-only when cannot open drive's
> file for read-write" result in read-only image can't be used as backed
> image in qemu-img.
>
> Cc: Naphtali Sprei<address@hidden>
> Signed-off-by: Sheng Yang<address@hidden>
>    

Applied.  Thanks.

Regards,

Anthony Liguori
> ---
>   qemu-img.c |   15 ++++++++++-----
>   1 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/qemu-img.c b/qemu-img.c
> index 3cea8ce..ac4d15e 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -188,11 +188,13 @@ static int read_password(char *buf, int buf_size)
>   #endif
>
>   static BlockDriverState *bdrv_new_open(const char *filename,
> -                                       const char *fmt)
> +                                       const char *fmt,
> +                                       int readonly)
>   {
>       BlockDriverState *bs;
>       BlockDriver *drv;
>       char password[256];
> +    int flags = BRDV_O_FLAGS;
>
>       bs = bdrv_new("");
>       if (!bs)
> @@ -204,7 +206,10 @@ static BlockDriverState *bdrv_new_open(const char 
> *filename,
>       } else {
>           drv = NULL;
>       }
> -    if (bdrv_open2(bs, filename, BRDV_O_FLAGS | BDRV_O_RDWR, drv)<  0) {
> +    if (!readonly) {
> +        flags |= BDRV_O_RDWR;
> +    }
> +    if (bdrv_open2(bs, filename, flags, drv)<  0) {
>           error("Could not open '%s'", filename);
>       }
>       if (bdrv_is_encrypted(bs)) {
> @@ -343,7 +348,7 @@ static int img_create(int argc, char **argv)
>                   }
>               }
>
> -            bs = bdrv_new_open(backing_file->value.s, fmt);
> +            bs = bdrv_new_open(backing_file->value.s, fmt, 1);
>               bdrv_get_geometry(bs,&size);
>               size *= 512;
>               bdrv_delete(bs);
> @@ -627,7 +632,7 @@ static int img_convert(int argc, char **argv)
>
>       total_sectors = 0;
>       for (bs_i = 0; bs_i<  bs_n; bs_i++) {
> -        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
> +        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, 1);
>           if (!bs[bs_i])
>               error("Could not open '%s'", argv[optind + bs_i]);
>           bdrv_get_geometry(bs[bs_i],&bs_sectors);
> @@ -685,7 +690,7 @@ static int img_convert(int argc, char **argv)
>           }
>       }
>
> -    out_bs = bdrv_new_open(out_filename, out_fmt);
> +    out_bs = bdrv_new_open(out_filename, out_fmt, 0);
>
>       bs_i = 0;
>       bs_offset = 0;
>