On 11/09/2015 03:12 PM, Karel Zak wrote:
> On Mon, Nov 09, 2015 at 02:06:26PM +0100, Florian Margaine wrote:
>> Instead of using string functions to extract the device name and reading
>> this file, this patch uses the loop device API through ioctl to get the
>> correct backing file.
>
> #define LO_NAME_SIZE 64
>
> struct loop_info64 {
> ...
> uint8_t lo_file_name[LO_NAME_SIZE];
> };
>
>
> The loopdev is based on file descriptor, the lo_file_name[] is hint
> only and it does not have to match with the real path and the most
> important problem is that it uses 64-bytes buffer.
>
> For losetup we use LOOP_GET_STATUS64 ioctl as fallback solution only.So btrfs-progs should do the same? Use the /sys filesystem by default, and use ioctl if it doesn't find the file? > > Karel > > -- Florian Margaine Product Engineer @ Platform.sh https://platform.sh https://keybase.io/fmargaine
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