Re: [Qemu-devel] [PATCH 05/13] vvfat: introduce offset_to_bootsector, offset_to_fat and offset_to_root_dir

[Kevin Wolf]

Am 16.05.2017 um 17:05 hat Eric Blake geschrieben:
> On 05/16/2017 09:16 AM, Kevin Wolf wrote:
> > Am 15.05.2017 um 22:31 hat Hervé Poussineau geschrieben:
> >> - offset_to_bootsector is the number of sectors up to FAT bootsector
> >> - offset_to_fat is the number of sectors up to first File Allocation Table
> >> - offset_to_root_dir is the number of sectors up to root directory sector
> > 
> > Hm... These names make me think of byte offsets. Not completely opposed
> > to them, but if anyone can think of something better...?
> 
> I _want_ us to move towards byte offsets.  Thinking in sector offsets is
> madness, especially since I already have patches posted to make
> bdrv_get_block_status() converted to a byte-wise interface.
> 
> How hard is it to make all of the new variables be byte offsets, then
> scale them to sectors as needed?  You can assert() that the byte offsets
> are sector-aligned, so that the scaling doesn't have to worry about
> rounding effects during the divisions.

If we want to convert it to bytes internally (I'm not sure how useful it
is with vvfat), that would definitely be a separate patch or even
series.

Kevin

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