>>>>> "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.
--
Martin K. Petersen Oracle Linux Engineering
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