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Commit dcd3a754 authored by Moger, Babu's avatar Moger, Babu Committed by James Bottomley
Browse files

[SCSI] scsi_dh_alua: Store the PREF bit from RTPG 



PREF bit indicates preferred target port group for accessing a logical
unit. This bit is used to optimize the STPG command handling.

Signed-off-by: default avatarBabu Moger <babu.moger@netapp.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 4335d092

drivers/scsi/device_handler/scsi_dh_alua.c

+4 −1
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ struct alua_dh_data { 
	int			rel_port;

	int			tpgs;

	int			state;

	int			pref;

	unsigned		flags; /* used for optimizing STPG */

	unsigned char		inq[ALUA_INQUIRY_SIZE];

	unsigned char		*buff;
@@ -558,14 +559,16 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h) 
	for (k = 4, ucp = h->buff + 4; k < len; k += off, ucp += off) {

		if (h->group_id == (ucp[2] << 8) + ucp[3]) {

			h->state = ucp[0] & 0x0f;

			h->pref = ucp[0] >> 7;

			valid_states = ucp[1];

		}

		off = 8 + (ucp[7] * 4);

	}



	sdev_printk(KERN_INFO, sdev,

		    "%s: port group %02x state %c supports %c%c%c%c%c%c%c\n",

		    "%s: port group %02x state %c %s supports %c%c%c%c%c%c%c\n",

		    ALUA_DH_NAME, h->group_id, print_alua_state(h->state),

		    h->pref ? "preferred" : "non-preferred",

		    valid_states&TPGS_SUPPORT_TRANSITION?'T':'t',

		    valid_states&TPGS_SUPPORT_OFFLINE?'O':'o',

		    valid_states&TPGS_SUPPORT_LBA_DEPENDENT?'L':'l',