Re: [Qemu-devel] [Qemu-block] [PATCH v1 07/15] block: add flag to indicate that no I/O will be performed

[Kevin Wolf]

Am 12.01.2016 um 19:56 hat Daniel P. Berrange geschrieben:
> When opening an image it is useful to know whether the caller
> intends to perform I/O on the image or not. In the case of
> encrypted images this will allow the block driver to avoid
> having to prompt for decryption keys when we merely want to
> query header metadata about the image. eg qemu-img info
> 
> Signed-off-by: Daniel P. Berrange <address@hidden>

Would it be worth adding assertions to the block layer I/O functions
(most importantly, bdrv_aligned_preadv/pwritev) that this flag isn't
set?

Kevin