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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 <tom.ty89@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tom Yan 2016-07-13 04:31:23 +08:00 • committed by Tejun Heo
parent 5c79097a28
commit 2983860c76
2 changed files with 6 additions and 5 deletions
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5
include/linux/ata.h
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@ -48,6 +48,7 @@ enum {
ATA_MAX_SECTORS_1024 = 1024,
ATA_MAX_SECTORS_LBA48 = 65535,/* TODO: 65536? */
ATA_MAX_SECTORS_TAPE = 65535,
ATA_MAX_TRIM_RNUM = 64, /* 512-byte payload / (6-byte LBA + 2-byte range per entry) */
ATA_ID_WORDS = 256,
ATA_ID_CONFIG = 0,
@ -1069,12 +1070,12 @@ static inline void ata_id_to_hd_driveid(u16 *id)
* TO NV CACHE PINNED SET.
*/
static inline unsigned ata_set_lba_range_entries(void *_buffer,
unsigned buf_size, u64 sector, unsigned long count)
unsigned num, u64 sector, unsigned long count)
{
__le64 *buffer = _buffer;
unsigned i = 0, used_bytes;
while (i < buf_size / 8 ) { /* 6-byte LBA + 2-byte range per entry */
while (i < num) {
u64 entry = sector |
((u64)(count > 0xffff ? 0xffff : count) << 48);
buffer[i++] = __cpu_to_le64(entry);