Re: [Qemu-devel] [PATCH V6 2/5] qemu-img: Add infinite loop checking in bdrv_new_open()

[Stefan Weil <sw@weilnetz.de>]

See more suggestions below.

Am 08.11.2013 17:19, schrieb Jeff Cody:
> On Tue, Nov 05, 2013 at 10:09:18PM -0500, Xu Wang wrote:
>> Every image should be checked if there is infinite loop in backing
>> file chain before open it. So infinite loop check was added into.

... if there is an infinite loop in the backing
file chain before opening it. ...

>> bdrv_new_open(). If @filename is opened without the flag
>> BDRV_O_NO_BACKING, the infinite loop check should be called.
>>
>> Signed-off-by: Xu Wang <gesaint@linux.vnet.ibm.com>
>> ---
>>  qemu-img.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/qemu-img.c b/qemu-img.c
>> index d5ec45b..3af7996 100644
>> --- a/qemu-img.c
>> +++ b/qemu-img.c
>> @@ -281,6 +281,14 @@ static BlockDriverState *bdrv_new_open(const char *filename,
>>          drv = NULL;
>>      }
>>  
>> +    /* check backing file loop if the whole chain need to be opened */

... if the whole chain needs to be opened ...

>> +    if (!(flags & BDRV_O_NO_BACKING) &&
>> +        !bdrv_backing_chain_okay(filename, fmt)) {
>> +        error_report("bdrv_new_open: Open %s failed. There is loop exists "
>> +                     "in the backing chain", filename);
> I suggest rewording this for grammar; something like:
>  +        error_report("bdrv_new_open: Open %s failed. An infinite loop exists "
>  +                     "in the backing chain", filename);
>
>
>> +        goto fail;
>> +    }
>> +
>>      ret = bdrv_open(bs, filename, NULL, flags, drv, &local_err);
>>      if (ret < 0) {
>>          error_report("Could not open '%s': %s", filename,
>> -- 
>> 1.8.1.4