On Fri, Aug 12, 2016 at 3:56 PM, Martin K. Petersen
<martin.petersen@xxxxxxxxxx> wrote:
>>>>>> "Tom" == Tom Yan <tom.ty89@xxxxxxxxx> writes:
>
> Tom,
>
>>> put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM / (sector_size / 512), &rbuf[36]);
>
> How many 8-byte ranges fit in a 4096-byte sector?
>
> Tom> So were you trying to pointing out something I am still missing, or
> Tom> were you merely confirming I was right?
>
> I suggest you drop ATA_MAX_TRIM_RNUM and do:
>
> enum {
> ATA_TRIM_BLOCKS_PER_RANGE = 65535, /* 0xffff blocks per range desc. */
> ATA_TRIM_RANGE_SIZE_SHIFT = 3, /* range descriptor is 8 bytes */
> };
>
> put_unaligned_be64(ATA_TRIM_BLOCKS_PER_RANGE *
> sector_size >> ATA_TRIM_RANGE_SIZE_SHIFT, &rbuf[36]);
>
> Might be worthwhile to create an ata_max_lba_range_blocks() wrapper.
Ah, I think I am understanding now. When the sector size is 4K the
minimum page sent with WRITE SAME will be 4K.
If so, we also need to fix the write_same SATL code that is working
under the assumption of a 512 byte sector sector as the largest
guaranteed amount of data in the associated sg pages.
Keying off of sector_size should be straight forward there...
--
Shaun Tancheff
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