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authorTom Yan <tom.ty89@gmail.com>2016-07-12 23:31:23 +0300
committerTejun Heo <tj@kernel.org>2016-07-12 23:37:17 +0300
commit2983860c766870b701c4a34f435c1e18db086244 (patch)
treec9c084dc70f54fd860baead437e37f3e1ae9844b /include/linux/ata.h
parent5c79097a28c2525740dd9e4470676ec9d25bee45 (diff)
downloadlinux-2983860c766870b701c4a34f435c1e18db086244.tar.xz
libata-scsi: avoid repeated calculation of number of TRIM ranges
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>
Diffstat (limited to 'include/linux/ata.h')
-rw-r--r--include/linux/ata.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 2d6879392ae3..d20b1ee127b0 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -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);