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Re: [Qemu-block] [Qemu-devel] [PATCH v2 06/17] iscsi: Advertise realisti

From: Fam Zheng
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH v2 06/17] iscsi: Advertise realistic limits to block layer
Date: Thu, 16 Jun 2016 13:19:13 +0800
User-agent: Mutt/1.6.1 (2016-04-27)

On Tue, 06/14 15:30, Eric Blake wrote:
> The function sector_limits_lun2qemu() returns a value in units of
> the block layer's 512-byte sector, and can be as large as
> 0x40000000, which is much larger than the block layer's inherent
> limit of BDRV_REQUEST_MAX_SECTORS.  The block layer already
> handles '0' as a synonym to the inherent limit, and it is nicer
> to return this value than it is to calculate an arbitrary
> maximum, for two reasons: we want to ensure that the block layer
> continues to special-case '0' as 'no limit beyond the inherent
> limits'; and we want to be able to someday expand the block
> layer to allow 64-bit limits, where auditing for uses of
> BDRV_REQUEST_MAX_SECTORS will help us make sure we aren't
> artificially constraining iscsi to old block layer limits.
> Signed-off-by: Eric Blake <address@hidden>

Reviewed-by: Fam Zheng <address@hidden>

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