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Re: [Qemu-devel] [PATCH v2 2/2] sheepdog: implement .bdrv_co_is_allocate
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From: |
Liu Yuan |
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Subject: |
Re: [Qemu-devel] [PATCH v2 2/2] sheepdog: implement .bdrv_co_is_allocated() |
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Date: |
Mon, 22 Apr 2013 23:18:51 +0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 |
On 04/22/2013 11:03 PM, Stefan Hajnoczi wrote:
> Imagine sector_num = 0 and nb_sectors = SD_DATA_OBJ_SIZE / BDRV_SECTOR_SIZE.
>
> start = 0
> end = 1
>
> You don't want object 1, only object 0.
Hmm, math, ouch. So nb_sectors include sector_num? What I mean is
If [start, end] mean a range of sectors,so
1. nb_sectors = end - start + 1 (I assume this one)
2. nb_sectors = end - start (you meant this one?)
which one is correct for .co_is_allocated?
Thanks,
Yuan