[Qemu-devel] Re: [PATCH v2 4/4] Disable fall-back to read-only when cannot open drive's file for read-write

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Jan 17, 2010 at 04:48:15PM +0200, Naphtali Sprei wrote:
> 
> Signed-off-by: Naphtali Sprei <nsprei@redhat.com>
> ---
>  block.c |    6 ------
>  1 files changed, 0 insertions(+), 6 deletions(-)
> 
> diff --git a/block.c b/block.c
> index 8def3c4..f90e983 100644
> --- a/block.c
> +++ b/block.c
> @@ -444,8 +444,6 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
>      if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
>          bs->enable_write_cache = 1;
>  
> -    /* Note: for compatibility, we open disk image files as RDWR, and
> -       RDONLY as fallback */
>      bs->read_only = (flags & BDRV_O_RDWR) == 0;
>      if (!(flags & BDRV_O_FILE)) {
>          open_flags = (flags & (BDRV_O_RDWR | BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO));
> @@ -459,10 +457,6 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
>          ret = -ENOTSUP;
>      } else {
>          ret = drv->bdrv_open(bs, filename, open_flags);
> -        if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
> -            ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
> -            bs->read_only = 1;
> -        }

Maybe print an error message explaining the problem and
suggesting the solution?

>      }
>      if (ret < 0) {
>          qemu_free(bs->opaque);
> -- 
> 1.6.3.3
> 
>