Re: [Qemu-devel] [PATCH V3 0/7] Redefine and export backing file loop check

[Fam Zheng <famz@redhat.com>]

On Mon, 07/15 05:42, Xu Wang wrote:
> If there is loop exists in the backing file chain, many problems
> could be caused by it, such as no response and segment fault during
> system boot. Hence stopping backing file loop appear is very necessary.
> These patches refine and export loop checking function from collect_image_
> info_list() to block.c and build a independent function named bdrv_
> backing_file_loop_check(). Backing file loop checking is added before
> image created, before change backing file and before system boot.
> 
> Updates from V2:
>   1. Removed parameter @chain from bdrv_backing_file_loop_check()
>   2. Comments and format fix, all patches were checked by checkpatch.pl
>   3. Fixed *bs leak.
>   4. Improved logic of .lnk file recognization.
>   5. Add filename lenth limit check in while()
>   6. Changed get_win_inode() to get_inode() and move all inode get method
>      into it to make logic more simpler.
>   7. Added value of @fmt as suggested.
>   8. Added backing file loop check in qcow2.c/qed.c

Would you consider adding check in vmdk.c too, As it also supports
backing_hd?

Thanks.

Fam

> 
> Xu Wang (7):
>   block/qemu-img: Refine and export infinite loop checking in
>     collect_image_info_list()
>   block: Add WIN32 platform support for backing_file_loop_check()
>   block: Check infinite loop in bdrv_img_create()
>   block: Add backing file loop check in change_backing_file()
>   block: Add infinite loop check in drive_init()
>   block: Add backing file loop check in qcow2_change_backing_file()
>   block: Add backing file loop check in qed_change_backing_file()
> 
>  block.c               | 207 ++++++++++++++++++++++++++++++++++++++++++++++++--
>  block/qcow2.c         |   6 ++
>  block/qed.c           |   7 ++
>  blockdev.c            |   6 ++
>  include/block/block.h |   4 +
>  qemu-img.c            |  29 +++----
>  6 files changed, 234 insertions(+), 25 deletions(-)
> 
> -- 
> 1.8.1.4
>