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libata-scsi: avoid repeated calculation of number of TRIM ranges

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Currently libata statically allows only 1-block (512-byte) payload
for each TRIM command. Each payload can carry 64 TRIM ranges since
each range requires 8 bytes.

It is silly to keep doing the calculation (512 / 8) in different
places. Hence, define the new ATA_MAX_TRIM_RNUM for the result.

Signed-off-by: Tom Yan <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Tom Yan 2016-07-13 04:31:23 +08:00 • committed by Tejun Heo
commit 2983860c76
2 changed files with 6 additions and 5 deletions
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6
drivers/ata/libata-scsi.c
View file

@ -2319,7 +2319,7 @@ static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
* with the unmap bit set.
*/
if (ata_id_has_trim(args->id)) {
put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM, &rbuf[36]);
put_unaligned_be32(1, &rbuf[28]);
}
@ -3311,8 +3311,8 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
buf = page_address(sg_page(scsi_sglist(scmd)));
if (n_block <= 65535 * 512 / 8) {
size = ata_set_lba_range_entries(buf, 512, block, n_block);
if (n_block <= 65535 * ATA_MAX_TRIM_RNUM) {
size = ata_set_lba_range_entries(buf, ATA_MAX_TRIM_RNUM, block, n_block);
} else {
fp = 2;
goto invalid_fld;