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authorHannes Reinecke <hare@suse.de>2015-12-01 12:16:51 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2015-12-03 00:36:44 +0300
commit6c4fc04491754834d5b5be189ee8f49a1d92b433 (patch)
tree0a8104995bfb0f3e866ba6791a837956db6ce6b5 /drivers/scsi/device_handler
parent095077ad37043574ce7a3978e92c89f535a6612c (diff)
downloadlinux-6c4fc04491754834d5b5be189ee8f49a1d92b433.tar.xz
scsi_dh_alua: use flag for RTPG extended header
We should be using a flag when RTPG extended header is not supported, that saves us sending RTPG twice for older arrays. Signed-off-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/device_handler')
-rw-r--r--drivers/scsi/device_handler/scsi_dh_alua.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index fdf6557f68bf..d99fc14370cc 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -59,8 +59,9 @@
#define ALUA_FAILOVER_TIMEOUT 60
#define ALUA_FAILOVER_RETRIES 5
-/* flags passed from user level */
+/* device handler flags */
#define ALUA_OPTIMIZE_STPG 1
+#define ALUA_RTPG_EXT_HDR_UNSUPP 2
struct alua_dh_data {
int group_id;
@@ -134,8 +135,7 @@ static struct request *get_alua_req(struct scsi_device *sdev,
* submit_rtpg - Issue a REPORT TARGET GROUP STATES command
* @sdev: sdev the command should be sent to
*/
-static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h,
- bool rtpg_ext_hdr_req)
+static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
{
struct request *rq;
int err = 0;
@@ -148,7 +148,7 @@ static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h,
/* Prepare the command. */
rq->cmd[0] = MAINTENANCE_IN;
- if (rtpg_ext_hdr_req)
+ if (!(h->flags & ALUA_RTPG_EXT_HDR_UNSUPP))
rq->cmd[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
else
rq->cmd[1] = MI_REPORT_TARGET_PGS;
@@ -490,7 +490,6 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
int len, k, off, valid_states = 0;
unsigned char *ucp;
unsigned err, retval;
- bool rtpg_ext_hdr_req = 1;
unsigned long expiry, interval = 0;
unsigned int tpg_desc_tbl_off;
unsigned char orig_transition_tmo;
@@ -501,7 +500,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
expiry = round_jiffies_up(jiffies + h->transition_tmo * HZ);
retry:
- retval = submit_rtpg(sdev, h, rtpg_ext_hdr_req);
+ retval = submit_rtpg(sdev, h);
if (retval) {
if (!scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
&sense_hdr)) {
@@ -521,10 +520,10 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h, int wait_
* The retry without rtpg_ext_hdr_req set
* handles this.
*/
- if (rtpg_ext_hdr_req == 1 &&
+ if (!(h->flags & ALUA_RTPG_EXT_HDR_UNSUPP) &&
sense_hdr.sense_key == ILLEGAL_REQUEST &&
sense_hdr.asc == 0x24 && sense_hdr.ascq == 0) {
- rtpg_ext_hdr_req = 0;
+ h->flags |= ALUA_RTPG_EXT_HDR_UNSUPP;
goto retry;
}