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Re: [Qemu-block] [Qemu-devel] [PATCH 06/16] block: add BDS field to coun


From: Paolo Bonzini
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 06/16] block: add BDS field to count in-flight requests
Date: Wed, 9 Mar 2016 08:43:09 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0


On 09/03/2016 04:35, Fam Zheng wrote:
>> >  enum BdrvTrackedRequestType {
>> >      BDRV_TRACKED_READ,
>> >      BDRV_TRACKED_WRITE,
>> > -    BDRV_TRACKED_FLUSH,
>> > -    BDRV_TRACKED_IOCTL,
>> >      BDRV_TRACKED_DISCARD,
> Okay, so flush and ioctl are not needed, but why is discard different?

Discard can modify the contents of the device, so I think it's safer to
serialize it against RMW and copy-on-read operations.

Paolo



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