Re: [Qemu-devel] [PATCH v3] block: Close backing file early in bdrv_img_create

[Kevin Wolf]

Am 03.12.2013 um 14:57 hat Max Reitz geschrieben:
> Leaving the backing file open although it is not needed anymore can
> cause problems if it is opened through a block driver which allows
> exclusive access only and if the create function of the block driver
> used for the top image (the one being created) tries to close and reopen
> the image file (which will include opening the backing file a second
> time).
> 
> In particular, this will happen with a backing file opened through
> qemu-nbd and using qcow2 as the top image file format (which reopens the
> image to flush it to disk).
> 
> In addition, the BlockDriverState in bdrv_img_create() is used for the
> backing file only; it should therefore be made local to the respective
> block.
> 
> Signed-off-by: Max Reitz <address@hidden>

Reviewed-by: Kevin Wolf <address@hidden>