dif_storep is declared as pointer to unsigned char type. But it is
actually used to store vmalloced array of struct sd_dif_tuple.
This changes the type of dif_storep to the pointer to struct sd_dif_tuple.
It simplifies offset calculation for dif_storep and enables to remove
hardcoded size of struct sd_dif_tuple.
Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com>
Cc: "James E.J. Bottomley" <jbottom...@parallels.com>
Cc: Douglas Gilbert <dgilb...@interlog.com>
Cc: "Martin K. Petersen" <martin.peter...@oracle.com>
Cc: linux-scsi@vger.kernel.org
---
drivers/scsi/scsi_debug.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index ffbdb4c..e69cbc2 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -258,7 +258,7 @@ struct sdebug_queued_cmd {
static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
static unsigned char * fake_storep; /* ramdisk storage */
-static unsigned char *dif_storep; /* protection info */
+static struct sd_dif_tuple *dif_storep; /* protection info */
static void *map_storep; /* provisioning map */
static unsigned long map_size;
@@ -277,11 +277,6 @@ static char sdebug_proc_name[] = "scsi_debug";
static struct bus_type pseudo_lld_bus;
-static inline sector_t dif_offset(sector_t sector)
-{
- return sector << 3;
-}
-
static struct device_driver sdebug_driverfs_driver = {
.name = sdebug_proc_name,
.bus = &pseudo_lld_bus,
@@ -1653,7 +1648,7 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt,
sector_t start_sec,
start_sec = do_div(tmp_sec, sdebug_store_sectors);
- sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
+ sdt = dif_storep + start_sec;
for (i = 0 ; i < sectors ; i++) {
u16 csum;
@@ -1708,16 +1703,17 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt,
sector_t start_sec,
ei_lba++;
}
- resid = sectors * 8; /* Bytes of protection data to copy into sgl */
+ /* Bytes of protection data to copy into sgl */
+ resid = sectors * sizeof(*dif_storep);
sector = start_sec;
scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
int len = min(psgl->length, resid);
paddr = kmap_atomic(sg_page(psgl)) + psgl->offset;
- memcpy(paddr, dif_storep + dif_offset(sector), len);
+ memcpy(paddr, dif_storep + sector, len);
- sector += len >> 3;
+ sector += len / sizeof(*dif_storep);
if (sector >= sdebug_store_sectors) {
/* Force wrap */
tmp_sec = sector;
@@ -1891,7 +1887,7 @@ static int prot_verify_write(struct scsi_cmnd *SCpnt,
sector_t start_sec,
* correctness we need to verify each sector
* before writing it to "stable" storage
*/
- memcpy(dif_storep + dif_offset(sector), sdt, 8);
+ memcpy(dif_storep + sector, sdt, sizeof(*sdt));
sector++;
--
1.8.1.4
--
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