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From: | Kevin Wolf |
Subject: | Re: [Qemu-block] [PATCH v1 07/15] block: add flag to indicate that no I/O will be performed |
Date: | Wed, 13 Jan 2016 18:44:41 +0100 |
User-agent: | Mutt/1.5.21 (2010-09-15) |
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
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