Re: [dm-devel] [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios

From: Hannes Reinecke
Date: Thu Aug 13 2015 - 02:04:52 EST

On 08/08/2015 11:02 AM, Kent Overstreet wrote:
> On Sat, Aug 08, 2015 at 10:52:24AM +0200, Hannes Reinecke wrote:
>> Wouldn't it be easier to move both max_write_same_sectors and
>> max_discard sectors to 64 bit (ie to type sector_t) and be done with the
>> overflow?
>> Seems to me this is far too much coding around self-imposed restrictions...
> It's bio->bi_iter.bi_size that would have to be increased to 64 bits. Which I
> suppose wouldn't actually increase the size of struct bio (when sector_t is 64
> bits), since struct bvec_iter has padding right now...
Which I guess we should be doing anyway.
Devices are getting larger and larger, so in the long run in need to
be moved to 64 bits.


Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 NÃrnberg
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